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# HBASE Changelog
## Release 2.5.3 - Unreleased (as of 2023-02-01)
### IMPROVEMENTS:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-27506](https://issues.apache.org/jira/browse/HBASE-27506) | Optionally disable sorting directories by size in CleanerChore | Minor | . |
| [HBASE-27503](https://issues.apache.org/jira/browse/HBASE-27503) | Support replace \<FILE-PATH\> in GC\_OPTS for ZGC | Minor | scripts |
| [HBASE-27512](https://issues.apache.org/jira/browse/HBASE-27512) | Add file \`.git-blame-ignore-revs\` for \`git blame\` | Trivial | . |
| [HBASE-27487](https://issues.apache.org/jira/browse/HBASE-27487) | Slow meta can create pathological feedback loop with multigets | Major | . |
| [HBASE-27466](https://issues.apache.org/jira/browse/HBASE-27466) | hbase client metrics per user specified identity on hconnections. | Major | Client |
| [HBASE-27490](https://issues.apache.org/jira/browse/HBASE-27490) | Locating regions for all actions of batch requests can exceed operation timeout | Major | . |
| [HBASE-22924](https://issues.apache.org/jira/browse/HBASE-22924) | GitHUB PR job should use when clause to filter to just PRs. | Minor | build, community |
| [HBASE-27491](https://issues.apache.org/jira/browse/HBASE-27491) | AsyncProcess should not clear meta cache for RejectedExecutionException | Major | . |
| [HBASE-27459](https://issues.apache.org/jira/browse/HBASE-27459) | Improve our hbase\_docker to be able to build and start standalone clusters other than master branch | Major | scripts |
| [HBASE-27530](https://issues.apache.org/jira/browse/HBASE-27530) | Fix comment syntax errors | Trivial | documentation |
| [HBASE-27253](https://issues.apache.org/jira/browse/HBASE-27253) | Make slow log configs updatable with configuration observer | Major | . |
| [HBASE-27540](https://issues.apache.org/jira/browse/HBASE-27540) | Client metrics for success/failure counts. | Major | Client |
| [HBASE-27233](https://issues.apache.org/jira/browse/HBASE-27233) | Read blocks into off-heap if caching is disabled for read | Major | . |
| [HBASE-27531](https://issues.apache.org/jira/browse/HBASE-27531) | AsyncRequestFutureImpl unnecessarily clears meta cache for full server | Major | . |
| [HBASE-27565](https://issues.apache.org/jira/browse/HBASE-27565) | Make the initial corePoolSize configurable for ChoreService | Major | conf |
| [HBASE-27529](https://issues.apache.org/jira/browse/HBASE-27529) | Provide RS coproc ability to attach WAL extended attributes to mutations at replication sink | Major | Coprocessors, Replication |
| [HBASE-27562](https://issues.apache.org/jira/browse/HBASE-27562) | Publish SBOM artifacts | Major | java |
| [HBASE-27583](https://issues.apache.org/jira/browse/HBASE-27583) | Remove -X option when building protoc check in nightly and pre commit job | Major | jenkins, scripts |
### BUG FIXES:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-27463](https://issues.apache.org/jira/browse/HBASE-27463) | Reset sizeOfLogQueue when refresh replication source | Minor | Replication |
| [HBASE-27510](https://issues.apache.org/jira/browse/HBASE-27510) | Should use 'org.apache.hbase.thirdparty.io.netty.tryReflectionSetAccessible' | Major | . |
| [HBASE-27484](https://issues.apache.org/jira/browse/HBASE-27484) | FNFE on StoreFileScanner after a flush followed by a compaction | Major | . |
| [HBASE-27494](https://issues.apache.org/jira/browse/HBASE-27494) | Client meta cache clear by exception metrics are missing some cases | Minor | . |
| [HBASE-27519](https://issues.apache.org/jira/browse/HBASE-27519) | Another case for FNFE on StoreFileScanner after a flush followed by a compaction | Major | . |
| [HBASE-27498](https://issues.apache.org/jira/browse/HBASE-27498) | Observed lot of threads blocked in ConnectionImplementation.getKeepAliveMasterService | Major | Client |
| [HBASE-27524](https://issues.apache.org/jira/browse/HBASE-27524) | Fix python requirements problem | Major | scripts, security |
| [HBASE-27390](https://issues.apache.org/jira/browse/HBASE-27390) | getClusterMetrics NullPointerException when ServerTask status null | Major | . |
| [HBASE-27485](https://issues.apache.org/jira/browse/HBASE-27485) | HBaseTestingUtility minicluster requires log4j2 | Major | test |
| [HBASE-27566](https://issues.apache.org/jira/browse/HBASE-27566) | Bump gitpython from 3.1.29 to 3.1.30 in /dev-support | Major | scripts, security |
| [HBASE-27560](https://issues.apache.org/jira/browse/HBASE-27560) | CatalogJanitor consistencyCheck cannot report the hole on last region if next table is disabled in meta | Minor | hbck2 |
| [HBASE-27563](https://issues.apache.org/jira/browse/HBASE-27563) | ChaosMonkey sometimes generates invalid boundaries for random item selection | Minor | integration tests |
| [HBASE-27561](https://issues.apache.org/jira/browse/HBASE-27561) | hbase.master.port is ignored in processing of hbase.masters | Minor | Client |
| [HBASE-27564](https://issues.apache.org/jira/browse/HBASE-27564) | Add default encryption type for MiniKDC to fix failed tests on JDK11+ | Major | . |
| [HBASE-27579](https://issues.apache.org/jira/browse/HBASE-27579) | CatalogJanitor can cause data loss due to errors during cleanMergeRegion | Blocker | . |
| [HBASE-27589](https://issues.apache.org/jira/browse/HBASE-27589) | Rename TestConnectionImplementation in hbase-it to fix javadoc failure | Blocker | Client, documentation |
| [HBASE-27592](https://issues.apache.org/jira/browse/HBASE-27592) | Update hadoop netty version for hadoop-2.0 profile | Major | . |
| [HBASE-27586](https://issues.apache.org/jira/browse/HBASE-27586) | Bump up commons-codec to 1.15 | Major | dependencies, security |
| [HBASE-27547](https://issues.apache.org/jira/browse/HBASE-27547) | Close store file readers after region warmup | Major | regionserver |
| [HBASE-26967](https://issues.apache.org/jira/browse/HBASE-26967) | FilterList with FuzzyRowFilter and SingleColumnValueFilter evaluated with operator MUST\_PASS\_ONE doesn't work as expected | Critical | Filters |
### SUB-TASKS:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-27557](https://issues.apache.org/jira/browse/HBASE-27557) | [JDK17] Update shade plugin version | Minor | . |
| [HBASE-25516](https://issues.apache.org/jira/browse/HBASE-25516) | [JDK17] reflective access Field.class.getDeclaredField("modifiers") not supported | Major | Filesystem Integration |
| [HBASE-27591](https://issues.apache.org/jira/browse/HBASE-27591) | [JDK17] Fix failure TestImmutableScan#testScanCopyConstructor | Minor | . |
| [HBASE-27581](https://issues.apache.org/jira/browse/HBASE-27581) | [JDK17] Fix failure TestHBaseTestingUtil#testResolvePortConflict | Minor | test |
### OTHER:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-27513](https://issues.apache.org/jira/browse/HBASE-27513) | Modify README.txt to mention how to contribue | Major | community |
| [HBASE-27548](https://issues.apache.org/jira/browse/HBASE-27548) | Bump jettison from 1.5.1 to 1.5.2 | Major | dependabot, dependencies, security |
| [HBASE-27567](https://issues.apache.org/jira/browse/HBASE-27567) | Introduce ChaosMonkey Action to print HDFS Cluster status | Minor | integration tests |
| [HBASE-27568](https://issues.apache.org/jira/browse/HBASE-27568) | ChaosMonkey add support for JournalNodes | Major | integration tests |
| [HBASE-27575](https://issues.apache.org/jira/browse/HBASE-27575) | Bump future from 0.18.2 to 0.18.3 in /dev-support | Minor | . |
| [HBASE-27578](https://issues.apache.org/jira/browse/HBASE-27578) | Upgrade hbase-thirdparty to 4.1.4 | Blocker | dependencies, security |
| [HBASE-27588](https://issues.apache.org/jira/browse/HBASE-27588) | "Instantiating StoreFileTracker impl" INFO level logging is too chatty | Minor | . |
## Release 2.5.2 - Unreleased (as of 2022-11-24)
### NEW FEATURES:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-26809](https://issues.apache.org/jira/browse/HBASE-26809) | Report client backoff time for server overloaded in ConnectionMetrics | Major | . |
### IMPROVEMENTS:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-27434](https://issues.apache.org/jira/browse/HBASE-27434) | Use $revision as placeholder for maven version to make it easier to control the version from command line | Major | build, pom |
| [HBASE-27167](https://issues.apache.org/jira/browse/HBASE-27167) | s390x: Skip tests on unsupported compression libs | Major | build, pom |
| [HBASE-27450](https://issues.apache.org/jira/browse/HBASE-27450) | Update all our python scripts to use python3 | Major | scripts |
| [HBASE-27414](https://issues.apache.org/jira/browse/HBASE-27414) | Search order for locations in HFileLink | Minor | Performance |
| [HBASE-27495](https://issues.apache.org/jira/browse/HBASE-27495) | Improve HFileLinkCleaner to validate back reference links ahead the next traverse | Major | master |
| [HBASE-27408](https://issues.apache.org/jira/browse/HBASE-27408) | Improve BucketAllocatorException log to always include HFile name | Major | . |
| [HBASE-27496](https://issues.apache.org/jira/browse/HBASE-27496) | Optionally limit the amount of plans executed in the Normalizer | Minor | Normalizer |
### BUG FIXES:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-27433](https://issues.apache.org/jira/browse/HBASE-27433) | DefaultMobStoreCompactor should delete MobStoreFile cleanly when compaction is failed | Major | mob |
| [HBASE-27440](https://issues.apache.org/jira/browse/HBASE-27440) | metrics method removeHistogramMetrics trigger serious memory leak | Major | metrics, regionserver |
| [HBASE-25983](https://issues.apache.org/jira/browse/HBASE-25983) | javadoc generation fails on openjdk-11.0.11+9 | Major | documentation, pom |
| [HBASE-27446](https://issues.apache.org/jira/browse/HBASE-27446) | Spotbugs 4.7.2 report a lot of logging errors when generating report | Major | build, jenkins, scripts |
| [HBASE-27437](https://issues.apache.org/jira/browse/HBASE-27437) | TestHeapSize is flaky | Major | test |
| [HBASE-27472](https://issues.apache.org/jira/browse/HBASE-27472) | The personality script set wrong hadoop2 check version for branch-2 | Major | jenkins, scripts |
| [HBASE-27473](https://issues.apache.org/jira/browse/HBASE-27473) | Fix spotbugs warnings in hbase-rest Client.getResponseBody | Major | REST |
| [HBASE-27480](https://issues.apache.org/jira/browse/HBASE-27480) | Skip error prone for hadoop2/3 checkes in our nightly jobs | Major | jenkins, scripts |
| [HBASE-27469](https://issues.apache.org/jira/browse/HBASE-27469) | IllegalArgumentException is thrown by SnapshotScannerHDFSAclController when dropping a table | Major | snapshots |
| [HBASE-27379](https://issues.apache.org/jira/browse/HBASE-27379) | numOpenConnections metric is one less than the actual | Minor | metrics |
| [HBASE-27423](https://issues.apache.org/jira/browse/HBASE-27423) | Upgrade hbase-thirdparty to 4.1.3 and upgrade Jackson for CVE-2022-42003/42004 | Major | security |
| [HBASE-27464](https://issues.apache.org/jira/browse/HBASE-27464) | In memory compaction 'COMPACT' may cause data corruption when adding cells large than maxAlloc(default 256k) size | Critical | in-memory-compaction |
| [HBASE-27501](https://issues.apache.org/jira/browse/HBASE-27501) | The .flattened-pom.xml for some modules are not installed | Blocker | build, pom |
| [HBASE-27445](https://issues.apache.org/jira/browse/HBASE-27445) | result of DirectMemoryUtils#getDirectMemorySize may be wrong | Minor | UI |
| [HBASE-27504](https://issues.apache.org/jira/browse/HBASE-27504) | Remove duplicated config 'hbase.normalizer.merge.min\_region\_age.days' in hbase-default.xml | Minor | conf |
### TESTS:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-27479](https://issues.apache.org/jira/browse/HBASE-27479) | Flaky Test testClone in TestTaskMonitor | Trivial | test |
### SUB-TASKS:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-27475](https://issues.apache.org/jira/browse/HBASE-27475) | Use different jdks when running hadoopcheck in personality scripts | Critical | jenkins, scripts |
### OTHER:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-27425](https://issues.apache.org/jira/browse/HBASE-27425) | Run flaky test job more often | Minor | test |
| [HBASE-27460](https://issues.apache.org/jira/browse/HBASE-27460) | Fix the hadolint errors after HBASE-27456 | Major | scripts |
| [HBASE-27443](https://issues.apache.org/jira/browse/HBASE-27443) | Use java11 in the general check of our jenkins job | Major | build, jenkins |
## Release 2.5.1 - 2022-10-21
### NEW FEATURES:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-27314](https://issues.apache.org/jira/browse/HBASE-27314) | Make index block be customized and configured | Major | . |
### IMPROVEMENTS:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-27159](https://issues.apache.org/jira/browse/HBASE-27159) | Emit source metrics for BlockCacheExpressHitPercent | Minor | BlockCache, metrics |
| [HBASE-27339](https://issues.apache.org/jira/browse/HBASE-27339) | Improve sasl connection failure log message to include server | Minor | Client |
| [HBASE-27365](https://issues.apache.org/jira/browse/HBASE-27365) | Minimise block addition failures due to no space in bucket cache writers queue by introducing wait time | Major | BucketCache |
| [HBASE-27391](https://issues.apache.org/jira/browse/HBASE-27391) | Downgrade ERROR log to DEBUG in ConnectionUtils.updateStats | Major | . |
| [HBASE-27370](https://issues.apache.org/jira/browse/HBASE-27370) | Avoid decompressing blocks when reading from bucket cache prefetch threads | Major | . |
| [HBASE-27361](https://issues.apache.org/jira/browse/HBASE-27361) | Add .flattened-pom.xml to .gitignore | Major | build |
| [HBASE-27224](https://issues.apache.org/jira/browse/HBASE-27224) | HFile tool statistic sampling produces misleading results | Major | . |
| [HBASE-27340](https://issues.apache.org/jira/browse/HBASE-27340) | Artifacts with resolved profiles | Minor | build, pom |
| [HBASE-27332](https://issues.apache.org/jira/browse/HBASE-27332) | Remove RejectedExecutionHandler for long/short compaction thread pools | Minor | Compaction |
| [HBASE-27338](https://issues.apache.org/jira/browse/HBASE-27338) | brotli compression lib tests fail on arm64 | Minor | . |
| [HBASE-27320](https://issues.apache.org/jira/browse/HBASE-27320) | hide some sensitive configuration information in the UI | Minor | security, UI |
### BUG FIXES:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-27426](https://issues.apache.org/jira/browse/HBASE-27426) | Region server abort with failing to list region servers. | Major | Zookeeper |
| [HBASE-27432](https://issues.apache.org/jira/browse/HBASE-27432) | TestUsersOperationsWithSecureHadoop fails affter HBASE-27411 | Major | . |
| [HBASE-27420](https://issues.apache.org/jira/browse/HBASE-27420) | Failure while connecting to zk if HBase is running in standalone mode in a container | Minor | Zookeeper |
| [HBASE-27424](https://issues.apache.org/jira/browse/HBASE-27424) | Upgrade Jettison for CVE-2022-40149/40150 | Major | . |
| [HBASE-27419](https://issues.apache.org/jira/browse/HBASE-27419) | Update to hbase-thirdparty 4.1.2 | Major | dependencies |
| [HBASE-27407](https://issues.apache.org/jira/browse/HBASE-27407) | Fixing check for "description" request param in JMXJsonServlet.java | Minor | metrics |
| [HBASE-27409](https://issues.apache.org/jira/browse/HBASE-27409) | Fix the javadoc for WARCRecord | Major | documentation |
| [HBASE-27381](https://issues.apache.org/jira/browse/HBASE-27381) | Still seeing 'Stuck' in static initialization creating RegionInfo instance | Major | . |
| [HBASE-27368](https://issues.apache.org/jira/browse/HBASE-27368) | Do not need to throw IllegalStateException when peer is not active in ReplicationSource.initialize | Major | regionserver, Replication |
| [HBASE-27352](https://issues.apache.org/jira/browse/HBASE-27352) | Quoted string argument with spaces passed from command line are propagated wrongly to the underlying java class | Minor | shell |
| [HBASE-27362](https://issues.apache.org/jira/browse/HBASE-27362) | Fix some tests hung by CompactSplit.requestCompactionInternal ignoring compactionsEnabled check | Major | Compaction |
| [HBASE-27353](https://issues.apache.org/jira/browse/HBASE-27353) | opentelemetry-context jar missing at runtime causes MR jobs to fail | Minor | . |
| [HBASE-22939](https://issues.apache.org/jira/browse/HBASE-22939) | SpaceQuotas- Bulkload from different hdfs failed when space quotas are turned on. | Major | . |
| [HBASE-27336](https://issues.apache.org/jira/browse/HBASE-27336) | The region visualizer shows 'undefined' region server | Major | master, UI |
| [HBASE-27335](https://issues.apache.org/jira/browse/HBASE-27335) | HBase shell hang for a minute when quiting | Major | shell |
| [HBASE-27152](https://issues.apache.org/jira/browse/HBASE-27152) | Under compaction mark may leak | Major | Compaction |
| [HBASE-25922](https://issues.apache.org/jira/browse/HBASE-25922) | Disabled sanity checks ignored on snapshot restore | Minor | conf, snapshots |
| [HBASE-27246](https://issues.apache.org/jira/browse/HBASE-27246) | RSGroupMappingScript#getRSGroup has thread safety problem | Major | rsgroup |
| [HBASE-25166](https://issues.apache.org/jira/browse/HBASE-25166) | MobFileCompactionChore is closing the master's shared cluster connection | Major | master |
### TESTS:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-27360](https://issues.apache.org/jira/browse/HBASE-27360) | The trace related assertions are flaky for async client tests | Major | test, tracing |
### SUB-TASKS:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-27421](https://issues.apache.org/jira/browse/HBASE-27421) | Bump spotless plugin to 2.27.2 and reimplement the 'Remove unhelpful javadoc stubs' rule | Major | documentation, pom |
| [HBASE-27401](https://issues.apache.org/jira/browse/HBASE-27401) | Clean up current broken 'n's in our javadoc | Major | documentation |
| [HBASE-27403](https://issues.apache.org/jira/browse/HBASE-27403) | Remove 'Remove unhelpful javadoc stubs' spotless rule for now | Major | documentation, pom |
### OTHER:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-27431](https://issues.apache.org/jira/browse/HBASE-27431) | Remove TestRemoteTable.testLimitedScan | Trivial | REST, test |
| [HBASE-27411](https://issues.apache.org/jira/browse/HBASE-27411) | Update and clean up bcprov-jdk15on dependency | Minor | build |
| [HBASE-27372](https://issues.apache.org/jira/browse/HBASE-27372) | Update java versions in our Dockerfiles | Major | build, scripts |
| [HBASE-27373](https://issues.apache.org/jira/browse/HBASE-27373) | Fix new spotbugs warnings after upgrading spotbugs to 4.7.2 | Major | . |
| [HBASE-27371](https://issues.apache.org/jira/browse/HBASE-27371) | Bump spotbugs version | Major | build, pom |
## Release 2.5.0 - Unreleased (as of 2022-08-23)
### NEW FEATURES:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-27104](https://issues.apache.org/jira/browse/HBASE-27104) | Add a tool command list\_unknownservers | Major | master |
| [HBASE-27129](https://issues.apache.org/jira/browse/HBASE-27129) | Add a config that allows us to configure region-level storage policies | Major | regionserver |
| [HBASE-27028](https://issues.apache.org/jira/browse/HBASE-27028) | Add a shell command for flushing master local region | Minor | shell |
| [HBASE-26826](https://issues.apache.org/jira/browse/HBASE-26826) | Backport StoreFileTracker (HBASE-26067, HBASE-26584, and others) to branch-2.5 | Major | Operability, regionserver |
| [HBASE-26342](https://issues.apache.org/jira/browse/HBASE-26342) | Support custom paths of independent configuration and pool for hfile cleaner | Major | master |
| [HBASE-27018](https://issues.apache.org/jira/browse/HBASE-27018) | Add a tool command list\_liveservers | Major | . |
| [HBASE-26617](https://issues.apache.org/jira/browse/HBASE-26617) | Use spotless to reduce the pain on fixing checkstyle issues | Major | build, community |
| [HBASE-26959](https://issues.apache.org/jira/browse/HBASE-26959) | Brotli compression support | Minor | . |
| [HBASE-25865](https://issues.apache.org/jira/browse/HBASE-25865) | Visualize current state of region assignment | Blocker | master, Operability, Usability |
| [HBASE-26703](https://issues.apache.org/jira/browse/HBASE-26703) | Allow configuration of IPC queue balancer | Minor | . |
| [HBASE-26576](https://issues.apache.org/jira/browse/HBASE-26576) | Allow Pluggable Queue to belong to FastPath or normal Balanced Executor | Minor | regionserver, rpc |
| [HBASE-26347](https://issues.apache.org/jira/browse/HBASE-26347) | Support detect and exclude slow DNs in fan-out of WAL | Major | wal |
| [HBASE-26284](https://issues.apache.org/jira/browse/HBASE-26284) | Add HBase Thrift API to get all table names along with whether it is enabled or not | Major | Thrift |
| [HBASE-26141](https://issues.apache.org/jira/browse/HBASE-26141) | Add tracing support for HTable and sync connection on branch-2 | Major | tracing |
| [HBASE-6908](https://issues.apache.org/jira/browse/HBASE-6908) | Pluggable Call BlockingQueue for HBaseServer | Major | IPC/RPC |
| [HBASE-25841](https://issues.apache.org/jira/browse/HBASE-25841) | Add basic jshell support | Minor | shell, Usability |
| [HBASE-25756](https://issues.apache.org/jira/browse/HBASE-25756) | Support alternate compression for major and minor compactions | Minor | Compaction |
| [HBASE-25751](https://issues.apache.org/jira/browse/HBASE-25751) | Add writable TimeToPurgeDeletes to ScanOptions | Major | . |
| [HBASE-25665](https://issues.apache.org/jira/browse/HBASE-25665) | Disable reverse DNS lookup for SASL Kerberos client connection | Major | . |
| [HBASE-25587](https://issues.apache.org/jira/browse/HBASE-25587) | [hbck2] Schedule SCP for all unknown servers | Major | hbase-operator-tools, hbck2 |
| [HBASE-25460](https://issues.apache.org/jira/browse/HBASE-25460) | Expose drainingServers as cluster metric | Major | metrics |
| [HBASE-25496](https://issues.apache.org/jira/browse/HBASE-25496) | add get\_namespace\_rsgroup command | Major | . |
| [HBASE-24620](https://issues.apache.org/jira/browse/HBASE-24620) | Add a ClusterManager which submits command to ZooKeeper and its Agent which picks and execute those Commands. | Major | integration tests |
| [HBASE-22749](https://issues.apache.org/jira/browse/HBASE-22749) | Distributed MOB compactions | Major | mob |
### IMPROVEMENTS:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-27305](https://issues.apache.org/jira/browse/HBASE-27305) | add an option to skip file splitting when bulkload hfiles | Minor | tooling |
| [HBASE-27089](https://issues.apache.org/jira/browse/HBASE-27089) | Add “commons.crypto.stream.buffer.size” configuration | Minor | io |
| [HBASE-27268](https://issues.apache.org/jira/browse/HBASE-27268) | In trace log mode, the client does not print callId/startTime and the server does not print receiveTime | Minor | logging |
| [HBASE-26982](https://issues.apache.org/jira/browse/HBASE-26982) | Add index and bloom filter statistics of LruBlockCache on rs web UI | Minor | BlockCache, UI |
| [HBASE-27296](https://issues.apache.org/jira/browse/HBASE-27296) | Some Cell's implementation of toString() such as IndividualBytesFieldCell prints out value and tags which is too verbose | Minor | logging |
| [HBASE-27283](https://issues.apache.org/jira/browse/HBASE-27283) | Use readTO instead of hard coded RpcClient.DEFAULT\_SOCKET\_TIMEOUT\_READ when creating ReadTimeoutHandler in NettyRpcConnection | Major | IPC/RPC, test |
| [HBASE-27273](https://issues.apache.org/jira/browse/HBASE-27273) | Should stop autoRead and skip all the bytes when rpc request too big | Major | IPC/RPC |
| [HBASE-27153](https://issues.apache.org/jira/browse/HBASE-27153) | Improvements to read-path tracing | Major | Operability, regionserver |
| [HBASE-27229](https://issues.apache.org/jira/browse/HBASE-27229) | BucketCache statistics should not count evictions by hfile | Major | . |
| [HBASE-27222](https://issues.apache.org/jira/browse/HBASE-27222) | Purge FutureReturnValueIgnored warnings from error prone | Major | netty |
| [HBASE-20499](https://issues.apache.org/jira/browse/HBASE-20499) | Replication/Priority executors can use specific max queue length as default value instead of general maxQueueLength | Minor | rpc |
| [HBASE-27208](https://issues.apache.org/jira/browse/HBASE-27208) | Use spotless to purge the missing summary warnings from error prone | Major | pom |
| [HBASE-27048](https://issues.apache.org/jira/browse/HBASE-27048) | Server side scanner time limit should account for time in queue | Major | . |
| [HBASE-27088](https://issues.apache.org/jira/browse/HBASE-27088) | IntegrationLoadTestCommonCrawl async load improvements | Minor | integration tests, test |
| [HBASE-27149](https://issues.apache.org/jira/browse/HBASE-27149) | Server should close scanner if client times out before results are ready | Major | . |
| [HBASE-27188](https://issues.apache.org/jira/browse/HBASE-27188) | Report maxStoreFileCount in jmx | Minor | . |
| [HBASE-27186](https://issues.apache.org/jira/browse/HBASE-27186) | Report block cache size metrics separately for L1 and L2 | Minor | . |
| [HBASE-26950](https://issues.apache.org/jira/browse/HBASE-26950) | Use AsyncConnection in ReplicationSink | Major | . |
| [HBASE-27078](https://issues.apache.org/jira/browse/HBASE-27078) | Allow configuring a separate timeout for meta scans | Major | . |
| [HBASE-27101](https://issues.apache.org/jira/browse/HBASE-27101) | support commons-crypto version 1.1.0 | Minor | . |
| [HBASE-26218](https://issues.apache.org/jira/browse/HBASE-26218) | Better logging in CanaryTool | Minor | canary |
| [HBASE-27146](https://issues.apache.org/jira/browse/HBASE-27146) | Avoid CellUtil.cloneRow in MetaCellComparator | Major | meta, Offheaping, Performance |
| [HBASE-27125](https://issues.apache.org/jira/browse/HBASE-27125) | The batch size of cleaning expired mob files should have an upper bound | Minor | mob |
| [HBASE-26923](https://issues.apache.org/jira/browse/HBASE-26923) | PerformanceEvaluation support encryption option | Minor | PE |
| [HBASE-27095](https://issues.apache.org/jira/browse/HBASE-27095) | HbckChore should produce a report | Major | hbck2, master |
| [HBASE-27046](https://issues.apache.org/jira/browse/HBASE-27046) | The filenum in AbstractFSWAL should be monotone increasing | Major | . |
| [HBASE-27093](https://issues.apache.org/jira/browse/HBASE-27093) | AsyncNonMetaRegionLocator：put Complete CompletableFuture outside lock block | Major | asyncclient, Client |
| [HBASE-27080](https://issues.apache.org/jira/browse/HBASE-27080) | Optimize debug output log of ConstantSizeRegionSplitPolicy class. | Minor | logging |
| [HBASE-26649](https://issues.apache.org/jira/browse/HBASE-26649) | Support meta replica LoadBalance mode for RegionLocator#getAllRegionLocations() | Major | meta replicas |
| [HBASE-26320](https://issues.apache.org/jira/browse/HBASE-26320) | Separate Log Cleaner DirScanPool to prevent the OLDWALs from filling up the disk when archive is large | Major | Operability |
| [HBASE-27043](https://issues.apache.org/jira/browse/HBASE-27043) | Let lock wait timeout to improve performance of SnapshotHFileCleaner | Major | snapshots |
| [HBASE-25465](https://issues.apache.org/jira/browse/HBASE-25465) | Use javac --release option for supporting cross version compilation | Minor | create-release |
| [HBASE-27013](https://issues.apache.org/jira/browse/HBASE-27013) | Introduce read all bytes when using pread for prefetch | Major | HFile, Performance |
| [HBASE-27003](https://issues.apache.org/jira/browse/HBASE-27003) | Optimize log format for PerformanceEvaluation | Minor | . |
| [HBASE-26990](https://issues.apache.org/jira/browse/HBASE-26990) | Add default implementation for BufferedMutator interface setters | Minor | . |
| [HBASE-26419](https://issues.apache.org/jira/browse/HBASE-26419) | Tracing Spans of RPCs should follow otel semantic conventions | Blocker | tracing |
| [HBASE-26961](https://issues.apache.org/jira/browse/HBASE-26961) | cache region locations when getAllRegionLocations() for branch-2.4+ | Minor | Client |
| [HBASE-26975](https://issues.apache.org/jira/browse/HBASE-26975) | Add on heap and off heap memstore info in rs web UI | Minor | UI |
| [HBASE-26980](https://issues.apache.org/jira/browse/HBASE-26980) | Update javadoc of BucketCache.java | Trivial | documentation |
| [HBASE-26971](https://issues.apache.org/jira/browse/HBASE-26971) | SnapshotInfo --snapshot param is marked as required even when trying to list all snapshots | Minor | . |
| [HBASE-26807](https://issues.apache.org/jira/browse/HBASE-26807) | Unify CallQueueTooBigException special pause with CallDroppedException | Major | . |
| [HBASE-26891](https://issues.apache.org/jira/browse/HBASE-26891) | Make MetricsConnection scope configurable | Minor | . |
| [HBASE-26947](https://issues.apache.org/jira/browse/HBASE-26947) | Implement a special TestAppender to limit the size of test output | Major | logging, test |
| [HBASE-26618](https://issues.apache.org/jira/browse/HBASE-26618) | Involving primary meta region in meta scan with CatalogReplicaLoadBalanceSimpleSelector | Minor | meta replicas |
| [HBASE-26885](https://issues.apache.org/jira/browse/HBASE-26885) | The TRSP should not go on when it get a bogus server name from AM | Major | proc-v2 |
| [HBASE-26872](https://issues.apache.org/jira/browse/HBASE-26872) | Load rate calculator for cost functions should be more precise | Major | Balancer |
| [HBASE-26832](https://issues.apache.org/jira/browse/HBASE-26832) | Avoid repeated releasing of flushed wal entries in AsyncFSWAL#syncCompleted | Major | wal |
| [HBASE-26878](https://issues.apache.org/jira/browse/HBASE-26878) | TableInputFormatBase should cache RegionSizeCalculator | Minor | . |
| [HBASE-26175](https://issues.apache.org/jira/browse/HBASE-26175) | MetricsHBaseServer should record all kinds of Exceptions | Minor | metrics |
| [HBASE-21065](https://issues.apache.org/jira/browse/HBASE-21065) | Try ROW\_INDEX\_V1 encoding on meta table (fix bloomfilters on meta while we are at it) | Major | meta, Performance |
| [HBASE-26858](https://issues.apache.org/jira/browse/HBASE-26858) | Refactor TestMasterRegionOnTwoFileSystems to avoid dead loop | Major | test |
| [HBASE-26833](https://issues.apache.org/jira/browse/HBASE-26833) | Avoid waiting to clear buffer usage of ReplicationSourceShipper when aborting the RS | Major | regionserver, Replication |
| [HBASE-26848](https://issues.apache.org/jira/browse/HBASE-26848) | Set java.io.tmpdir on mvn command when running jenkins job | Major | jenkins, test |
| [HBASE-26828](https://issues.apache.org/jira/browse/HBASE-26828) | Increase the concurrency when running UTs in pre commit job | Major | jenkins, test |
| [HBASE-26680](https://issues.apache.org/jira/browse/HBASE-26680) | Close and do not write trailer for the broken WAL writer | Major | wal |
| [HBASE-26720](https://issues.apache.org/jira/browse/HBASE-26720) | ExportSnapshot should validate the source snapshot before copying files | Major | snapshots |
| [HBASE-26275](https://issues.apache.org/jira/browse/HBASE-26275) | update error message when executing deleteall with ROWPREFIXFILTER in meta table | Minor | shell |
| [HBASE-26835](https://issues.apache.org/jira/browse/HBASE-26835) | Rewrite TestLruAdaptiveBlockCache to make it more stable | Major | test |
| [HBASE-26830](https://issues.apache.org/jira/browse/HBASE-26830) | Rewrite TestLruBlockCache to make it more stable | Major | test |
| [HBASE-26814](https://issues.apache.org/jira/browse/HBASE-26814) | Default StoreHotnessProtector to off, with logs to guide when to turn it on | Major | . |
| [HBASE-26784](https://issues.apache.org/jira/browse/HBASE-26784) | Use HIGH\_QOS for ResultScanner.close requests | Major | . |
| [HBASE-26552](https://issues.apache.org/jira/browse/HBASE-26552) | Introduce retry to logroller to avoid abort | Major | wal |
| [HBASE-26792](https://issues.apache.org/jira/browse/HBASE-26792) | Implement ScanInfo#toString | Minor | regionserver |
| [HBASE-26731](https://issues.apache.org/jira/browse/HBASE-26731) | Metrics for tracking of active scanners | Minor | . |
| [HBASE-26789](https://issues.apache.org/jira/browse/HBASE-26789) | Automatically add default security headers to http/rest if SSL enabled | Major | REST, UI |
| [HBASE-26765](https://issues.apache.org/jira/browse/HBASE-26765) | Minor refactor of async scanning code | Major | . |
| [HBASE-26659](https://issues.apache.org/jira/browse/HBASE-26659) | The ByteBuffer of metadata in RAMQueueEntry in BucketCache could be reused. | Major | BucketCache, Performance |
| [HBASE-26730](https://issues.apache.org/jira/browse/HBASE-26730) | Extend hbase shell 'status' command to support an option 'tasks' | Minor | Operability, shell |
| [HBASE-26709](https://issues.apache.org/jira/browse/HBASE-26709) | Ban the usage of junit 3 TestCase | Major | test |
| [HBASE-26724](https://issues.apache.org/jira/browse/HBASE-26724) | Backport the UT changes in HBASE-24510 to branch-2.x | Major | test |
| [HBASE-26702](https://issues.apache.org/jira/browse/HBASE-26702) | Make ageOfLastShip, ageOfLastApplied extend TimeHistogram instead of plain histogram. | Minor | metrics, Replication |
| [HBASE-26726](https://issues.apache.org/jira/browse/HBASE-26726) | Allow disable of region warmup before graceful move | Minor | master, Region Assignment |
| [HBASE-26657](https://issues.apache.org/jira/browse/HBASE-26657) | ProfileServlet should move the output location to hbase specific directory | Minor | . |
| [HBASE-26590](https://issues.apache.org/jira/browse/HBASE-26590) | Hbase-client Meta lookup performance regression between hbase-1 and hbase-2 | Major | meta |
| [HBASE-26567](https://issues.apache.org/jira/browse/HBASE-26567) | Remove IndexType from ChunkCreator | Major | in-memory-compaction |
| [HBASE-26641](https://issues.apache.org/jira/browse/HBASE-26641) | Split TestMasterFailoverWithProcedures | Major | proc-v2, test |
| [HBASE-26629](https://issues.apache.org/jira/browse/HBASE-26629) | Add expiration for long time vacant scanners in Thrift2 | Major | Performance, Thrift |
| [HBASE-26638](https://issues.apache.org/jira/browse/HBASE-26638) | Cherry-pick the ReflectionUtils improvements in HBASE-21515 to branch-2 | Major | util |
| [HBASE-26635](https://issues.apache.org/jira/browse/HBASE-26635) | Optimize decodeNumeric in OrderedBytes | Major | Performance |
| [HBASE-26623](https://issues.apache.org/jira/browse/HBASE-26623) | Report CallDroppedException in exception metrics | Minor | IPC/RPC, metrics, rpc |
| [HBASE-26609](https://issues.apache.org/jira/browse/HBASE-26609) | Round the size to MB or KB at the end of calculation in HRegionServer.createRegionLoad | Major | regionserver |
| [HBASE-26598](https://issues.apache.org/jira/browse/HBASE-26598) | Fix excessive connections in MajorCompactor | Major | Compaction, tooling |
| [HBASE-26579](https://issues.apache.org/jira/browse/HBASE-26579) | Set storage policy of recovered edits when wal storage type is configured | Major | Recovery |
| [HBASE-26601](https://issues.apache.org/jira/browse/HBASE-26601) | maven-gpg-plugin failing with "Inappropriate ioctl for device" | Major | build |
| [HBASE-26556](https://issues.apache.org/jira/browse/HBASE-26556) | IT and Chaos Monkey improvements | Minor | integration tests |
| [HBASE-25547](https://issues.apache.org/jira/browse/HBASE-25547) | Thread pools should release unused resources | Minor | master, regionserver |
| [HBASE-26525](https://issues.apache.org/jira/browse/HBASE-26525) | Use unique thread name for group WALs | Major | wal |
| [HBASE-26517](https://issues.apache.org/jira/browse/HBASE-26517) | Add auth method information to AccessChecker audit log | Trivial | security |
| [HBASE-26512](https://issues.apache.org/jira/browse/HBASE-26512) | Make timestamp format configurable in HBase shell scan output | Major | shell |
| [HBASE-26485](https://issues.apache.org/jira/browse/HBASE-26485) | Introduce a method to clean restore directory after Snapshot Scan | Minor | snapshots |
| [HBASE-26479](https://issues.apache.org/jira/browse/HBASE-26479) | Print too slow/big scan's operation\_id in region server log | Minor | regionserver, scan |
| [HBASE-26475](https://issues.apache.org/jira/browse/HBASE-26475) | The flush and compact methods in HTU should skip processing secondary replicas | Major | test |
| [HBASE-26249](https://issues.apache.org/jira/browse/HBASE-26249) | Ameliorate compaction made by bulk-loading files | Major | . |
| [HBASE-26421](https://issues.apache.org/jira/browse/HBASE-26421) | Use HFileLink file to replace entire file‘s reference when splitting | Major | . |
| [HBASE-26267](https://issues.apache.org/jira/browse/HBASE-26267) | Master initialization fails if Master Region WAL dir is missing | Major | master |
| [HBASE-26446](https://issues.apache.org/jira/browse/HBASE-26446) | CellCounter should report serialized cell size counts too | Minor | . |
| [HBASE-26432](https://issues.apache.org/jira/browse/HBASE-26432) | Add tracing support in hbase shell | Minor | shell, tracing |
| [HBASE-26337](https://issues.apache.org/jira/browse/HBASE-26337) | Optimization for weighted random generators | Major | Balancer |
| [HBASE-26363](https://issues.apache.org/jira/browse/HBASE-26363) | OpenTelemetry configuration support for per-process service names | Major | tracing |
| [HBASE-26309](https://issues.apache.org/jira/browse/HBASE-26309) | Balancer tends to move regions to the server at the end of list | Major | Balancer |
| [HBASE-26305](https://issues.apache.org/jira/browse/HBASE-26305) | Move NavigableSet add operation to writer thread in BucketCache | Minor | BucketCache, Performance |
| [HBASE-26251](https://issues.apache.org/jira/browse/HBASE-26251) | StochasticLoadBalancer metrics should update even if balancer doesn't run | Minor | Balancer |
| [HBASE-26270](https://issues.apache.org/jira/browse/HBASE-26270) | Provide getConfiguration method for Region and Store interface | Minor | . |
| [HBASE-26273](https://issues.apache.org/jira/browse/HBASE-26273) | TableSnapshotInputFormat/TableSnapshotInputFormatImpl should use ReadType.STREAM for scanning HFiles | Major | mapreduce |
| [HBASE-26276](https://issues.apache.org/jira/browse/HBASE-26276) | Allow HashTable/SyncTable to perform rawScan when comparing cells | Major | . |
| [HBASE-26229](https://issues.apache.org/jira/browse/HBASE-26229) | Limit count and size of L0 files compaction in StripeCompactionPolicy | Major | Compaction |
| [HBASE-26243](https://issues.apache.org/jira/browse/HBASE-26243) | Fix typo for file 'hbase-server/src/main/java/org/apache/hadoop/hbase/util/HBaseFsck.java' | Trivial | . |
| [HBASE-25773](https://issues.apache.org/jira/browse/HBASE-25773) | TestSnapshotScannerHDFSAclController.setupBeforeClass is flaky | Major | . |
| [HBASE-26147](https://issues.apache.org/jira/browse/HBASE-26147) | Add dry run mode to hbase balancer | Major | Balancer, master |
| [HBASE-25642](https://issues.apache.org/jira/browse/HBASE-25642) | Fix or stop warning about already cached block | Major | BlockCache, Operability, regionserver |
| [HBASE-26212](https://issues.apache.org/jira/browse/HBASE-26212) | Allow AuthUtil automatic renewal to be disabled | Minor | Client, security |
| [HBASE-26187](https://issues.apache.org/jira/browse/HBASE-26187) | Write straight into the store directory when Splitting and Merging | Major | . |
| [HBASE-26193](https://issues.apache.org/jira/browse/HBASE-26193) | Do not store meta region location as permanent state on zookeeper | Major | meta, Zookeeper |
| [HBASE-24652](https://issues.apache.org/jira/browse/HBASE-24652) | master-status UI make date type fields sortable | Minor | master, Operability, UI, Usability |
| [HBASE-25680](https://issues.apache.org/jira/browse/HBASE-25680) | Non-idempotent test in TestReplicationHFileCleaner | Minor | test |
| [HBASE-26179](https://issues.apache.org/jira/browse/HBASE-26179) | TestRequestTooBigException spends too much time to finish | Major | test |
| [HBASE-26160](https://issues.apache.org/jira/browse/HBASE-26160) | Configurable disallowlist for live editing of loglevels | Minor | . |
| [HBASE-25469](https://issues.apache.org/jira/browse/HBASE-25469) | Add detailed RIT info in JSON format for consumption as metrics | Minor | master |
| [HBASE-26154](https://issues.apache.org/jira/browse/HBASE-26154) | Provide exception metric for quota exceeded and throttling | Minor | . |
| [HBASE-26144](https://issues.apache.org/jira/browse/HBASE-26144) | The HStore.snapshot method is never called in main code | Major | regionserver |
| [HBASE-26105](https://issues.apache.org/jira/browse/HBASE-26105) | Rectify the expired TODO comment in CombinedBC | Trivial | BlockCache |
| [HBASE-26146](https://issues.apache.org/jira/browse/HBASE-26146) | Allow custom opts for hbck in hbase bin | Minor | . |
| [HBASE-26118](https://issues.apache.org/jira/browse/HBASE-26118) | The HStore.commitFile and HStore.moveFileIntoPlace almost have the same logic | Major | Compaction, regionserver |
| [HBASE-26119](https://issues.apache.org/jira/browse/HBASE-26119) | Polish TestAsyncNonMetaRegionLocator | Major | meta replicas, test |
| [HBASE-21946](https://issues.apache.org/jira/browse/HBASE-21946) | Use ByteBuffer pread instead of byte[] pread in HFileBlock when applicable | Critical | Offheaping |
| [HBASE-26025](https://issues.apache.org/jira/browse/HBASE-26025) | Add a flag to mark if the IOError can be solved by retry in thrift IOError | Major | Thrift |
| [HBASE-25986](https://issues.apache.org/jira/browse/HBASE-25986) | Expose the NORMALIZARION\_ENABLED table descriptor through a property in hbase-site | Minor | Normalizer |
| [HBASE-25700](https://issues.apache.org/jira/browse/HBASE-25700) | Enhance znode parent validation when add\_peer | Minor | Replication |
| [HBASE-26069](https://issues.apache.org/jira/browse/HBASE-26069) | Remove HStore.compactRecentForTestingAssumingDefaultPolicy and DefaultCompactor.compactForTesting | Major | Compaction, test |
| [HBASE-26065](https://issues.apache.org/jira/browse/HBASE-26065) | StripeStoreFileManager does not need to throw IOException for most methods | Major | Compaction, HFile |
| [HBASE-25914](https://issues.apache.org/jira/browse/HBASE-25914) | Provide slow/large logs on RegionServer UI | Major | regionserver, UI |
| [HBASE-26012](https://issues.apache.org/jira/browse/HBASE-26012) | Improve logging and dequeue logic in DelayQueue | Minor | . |
| [HBASE-26020](https://issues.apache.org/jira/browse/HBASE-26020) | Split TestWALEntryStream.testDifferentCounts out | Major | Replication, test |
| [HBASE-25937](https://issues.apache.org/jira/browse/HBASE-25937) | Clarify UnknownRegionException | Minor | Client |
| [HBASE-25998](https://issues.apache.org/jira/browse/HBASE-25998) | Revisit synchronization in SyncFuture | Major | Performance, regionserver, wal |
| [HBASE-26000](https://issues.apache.org/jira/browse/HBASE-26000) | Optimize the display of ZK dump in the master web UI | Minor | . |
| [HBASE-25995](https://issues.apache.org/jira/browse/HBASE-25995) | Change the method name for DoubleArrayCost.setCosts | Major | Balancer |
| [HBASE-26002](https://issues.apache.org/jira/browse/HBASE-26002) | MultiRowMutationEndpoint should return the result of the conditional update | Major | Coprocessors |
| [HBASE-25993](https://issues.apache.org/jira/browse/HBASE-25993) | Make excluded SSL cipher suites configurable for all Web UIs | Major | . |
| [HBASE-25987](https://issues.apache.org/jira/browse/HBASE-25987) | Make SSL keystore type configurable for HBase ThriftServer | Major | Thrift |
| [HBASE-25666](https://issues.apache.org/jira/browse/HBASE-25666) | Explain why balancer is skipping runs | Major | Balancer, master, UI |
| [HBASE-25942](https://issues.apache.org/jira/browse/HBASE-25942) | Get rid of null regioninfo in wrapped connection exceptions | Trivial | logging |
| [HBASE-25745](https://issues.apache.org/jira/browse/HBASE-25745) | Deprecate/Rename config \`hbase.normalizer.min.region.count\` to \`hbase.normalizer.merge.min.region.count\` | Minor | master, Normalizer |
| [HBASE-25908](https://issues.apache.org/jira/browse/HBASE-25908) | Exclude jakarta.activation-api | Major | hadoop3, shading |
| [HBASE-25933](https://issues.apache.org/jira/browse/HBASE-25933) | Log trace raw exception, instead of cause message in NettyRpcServerRequestDecoder | Minor | . |
| [HBASE-25534](https://issues.apache.org/jira/browse/HBASE-25534) | Honor TableDescriptor settings earlier in normalization | Major | Normalizer |
| [HBASE-25906](https://issues.apache.org/jira/browse/HBASE-25906) | UI of master-status to show recent history of balancer desicion | Major | Balancer, master, UI |
| [HBASE-25899](https://issues.apache.org/jira/browse/HBASE-25899) | Improve efficiency of SnapshotHFileCleaner | Major | master |
| [HBASE-25682](https://issues.apache.org/jira/browse/HBASE-25682) | Add a new command to update the configuration of all RSs in a RSGroup | Major | Admin, shell |
| [HBASE-25032](https://issues.apache.org/jira/browse/HBASE-25032) | Do not assign regions to region server which has not called regionServerReport yet | Major | . |
| [HBASE-25860](https://issues.apache.org/jira/browse/HBASE-25860) | Add metric for successful wal roll requests. | Major | metrics, wal |
| [HBASE-25754](https://issues.apache.org/jira/browse/HBASE-25754) | StripeCompactionPolicy should support compacting cold regions | Minor | Compaction |
| [HBASE-25766](https://issues.apache.org/jira/browse/HBASE-25766) | Introduce RegionSplitRestriction that restricts the pattern of the split point | Major | . |
| [HBASE-25798](https://issues.apache.org/jira/browse/HBASE-25798) | typo in MetricsAssertHelper | Minor | . |
| [HBASE-25770](https://issues.apache.org/jira/browse/HBASE-25770) | Http InfoServers should honor gzip encoding when requested | Major | UI |
| [HBASE-25776](https://issues.apache.org/jira/browse/HBASE-25776) | Use Class.asSubclass to fix the warning in StochasticLoadBalancer.loadCustomCostFunctions | Minor | Balancer |
| [HBASE-25767](https://issues.apache.org/jira/browse/HBASE-25767) | CandidateGenerator.getRandomIterationOrder is too slow on large cluster | Major | Balancer, Performance |
| [HBASE-25762](https://issues.apache.org/jira/browse/HBASE-25762) | Improvement for some debug-logging guards | Minor | logging, Performance |
| [HBASE-25653](https://issues.apache.org/jira/browse/HBASE-25653) | Add units and round off region size to 2 digits after decimal | Major | master, Normalizer |
| [HBASE-25482](https://issues.apache.org/jira/browse/HBASE-25482) | Improve SimpleRegionNormalizer#getAverageRegionSizeMb | Minor | Normalizer |
| [HBASE-25759](https://issues.apache.org/jira/browse/HBASE-25759) | The master services field in LocalityBasedCostFunction is never used | Major | Balancer |
| [HBASE-25744](https://issues.apache.org/jira/browse/HBASE-25744) | Change default of \`hbase.normalizer.merge.min\_region\_size.mb\` to \`0\` | Major | master, Normalizer |
| [HBASE-25747](https://issues.apache.org/jira/browse/HBASE-25747) | Remove unused getWriteAvailable method in OperationQuota | Minor | Quotas |
| [HBASE-25558](https://issues.apache.org/jira/browse/HBASE-25558) | Adding audit log for execMasterService | Major | . |
| [HBASE-25703](https://issues.apache.org/jira/browse/HBASE-25703) | Support conditional update in MultiRowMutationEndpoint | Major | Coprocessors |
| [HBASE-25686](https://issues.apache.org/jira/browse/HBASE-25686) | [hbtop] Add some javadoc | Minor | hbtop |
| [HBASE-25627](https://issues.apache.org/jira/browse/HBASE-25627) | HBase replication should have a metric to represent if the source is stuck getting initialized | Major | Replication |
| [HBASE-25688](https://issues.apache.org/jira/browse/HBASE-25688) | Use CustomRequestLog instead of Slf4jRequestLog for jetty | Major | logging, UI |
| [HBASE-25678](https://issues.apache.org/jira/browse/HBASE-25678) | Support nonce operations for Increment/Append in RowMutations and CheckAndMutate | Major | . |
| [HBASE-25679](https://issues.apache.org/jira/browse/HBASE-25679) | Size of log queue metric is incorrect in branch-1/branch-2 | Major | . |
| [HBASE-25518](https://issues.apache.org/jira/browse/HBASE-25518) | Support separate child regions to different region servers | Major | . |
| [HBASE-25643](https://issues.apache.org/jira/browse/HBASE-25643) | The delayed FlushRegionEntry should be removed when we need a non-delayed one | Major | regionserver |
| [HBASE-25621](https://issues.apache.org/jira/browse/HBASE-25621) | Balancer should check region plan source to avoid misplace region groups | Major | Balancer |
| [HBASE-25374](https://issues.apache.org/jira/browse/HBASE-25374) | Make REST Client connection and socket time out configurable | Minor | REST |
| [HBASE-25597](https://issues.apache.org/jira/browse/HBASE-25597) | Add row info in Exception when cell size exceeds maxCellSize | Minor | . |
| [HBASE-25660](https://issues.apache.org/jira/browse/HBASE-25660) | Print split policy in use on Region open (as well as split policy vitals) | Trivial | . |
| [HBASE-25635](https://issues.apache.org/jira/browse/HBASE-25635) | CandidateGenerator may miss some region balance actions | Major | Balancer |
| [HBASE-25622](https://issues.apache.org/jira/browse/HBASE-25622) | Result#compareResults should compare tags. | Major | Client |
| [HBASE-25570](https://issues.apache.org/jira/browse/HBASE-25570) | On largish cluster, "CleanerChore: Could not delete dir..." makes master log unreadable | Major | . |
| [HBASE-25566](https://issues.apache.org/jira/browse/HBASE-25566) | RoundRobinTableInputFormat | Major | mapreduce |
| [HBASE-25636](https://issues.apache.org/jira/browse/HBASE-25636) | Expose HBCK report as metrics | Minor | metrics |
| [HBASE-25548](https://issues.apache.org/jira/browse/HBASE-25548) | Optionally allow snapshots to preserve cluster's max filesize config by setting it into table descriptor | Major | . |
| [HBASE-25582](https://issues.apache.org/jira/browse/HBASE-25582) | Support setting scan ReadType to be STREAM at cluster level | Major | . |
| [HBASE-23578](https://issues.apache.org/jira/browse/HBASE-23578) | [UI] Master UI shows long stack traces when table is broken | Minor | master, UI |
| [HBASE-25637](https://issues.apache.org/jira/browse/HBASE-25637) | Rename method completeCompaction to refreshStoreSizeCount | Minor | . |
| [HBASE-25492](https://issues.apache.org/jira/browse/HBASE-25492) | Create table with rsgroup info in branch-2 | Major | rsgroup |
| [HBASE-25603](https://issues.apache.org/jira/browse/HBASE-25603) | Add switch for compaction after bulkload | Major | Compaction |
| [HBASE-25539](https://issues.apache.org/jira/browse/HBASE-25539) | Add metric for age of oldest wal. | Major | metrics, regionserver |
| [HBASE-25574](https://issues.apache.org/jira/browse/HBASE-25574) | Revisit put/delete/increment/append related RegionObserver methods | Major | Coprocessors |
| [HBASE-25541](https://issues.apache.org/jira/browse/HBASE-25541) | In WALEntryStream, set the current path to null while dequeing the log | Major | . |
| [HBASE-23887](https://issues.apache.org/jira/browse/HBASE-23887) | New L1 cache : AdaptiveLRU | Major | BlockCache, Performance |
| [HBASE-25364](https://issues.apache.org/jira/browse/HBASE-25364) | Redo the getMidPoint() in HFileWriterImpl to get rid of the double comparison process | Minor | . |
| [HBASE-25519](https://issues.apache.org/jira/browse/HBASE-25519) | BLOCKSIZE needs to support pretty print | Major | . |
| [HBASE-24772](https://issues.apache.org/jira/browse/HBASE-24772) | Use GetoptLong or OptionParser in hbase-shell | Minor | shell |
| [HBASE-25542](https://issues.apache.org/jira/browse/HBASE-25542) | Add client detail to scan name so when lease expires, we have clue on who was scanning | Major | scan |
| [HBASE-25553](https://issues.apache.org/jira/browse/HBASE-25553) | It is better for ReplicationTracker.getListOfRegionServers to return ServerName instead of String | Major | . |
| [HBASE-25528](https://issues.apache.org/jira/browse/HBASE-25528) | Dedicated merge dispatch threadpool on master | Minor | master |
| [HBASE-25536](https://issues.apache.org/jira/browse/HBASE-25536) | Remove 0 length wal file from logQueue if it belongs to old sources. | Major | Replication |
| [HBASE-25329](https://issues.apache.org/jira/browse/HBASE-25329) | Dump region hashes in logs for the regions that are stuck in transition for more than a configured amount of time | Minor | . |
| [HBASE-25475](https://issues.apache.org/jira/browse/HBASE-25475) | Improve unit test for HBASE-25445 : SplitWALRemoteProcedure failed to archive split WAL | Minor | wal |
| [HBASE-25431](https://issues.apache.org/jira/browse/HBASE-25431) | MAX\_FILESIZE and MEMSTORE\_FLUSHSIZE should not be set negative number | Major | . |
| [HBASE-25439](https://issues.apache.org/jira/browse/HBASE-25439) | Add BYTE unit in PrettyPrinter.Unit | Major | . |
| [HBASE-25249](https://issues.apache.org/jira/browse/HBASE-25249) | Adding StoreContext | Major | . |
| [HBASE-23340](https://issues.apache.org/jira/browse/HBASE-23340) | hmaster /hbase/replication/rs session expired (hbase replication default value is true, we don't use ) causes logcleaner can not clean oldWALs, which resulits in oldWALs too large (more than 2TB) | Major | master |
| [HBASE-25449](https://issues.apache.org/jira/browse/HBASE-25449) | 'dfs.client.read.shortcircuit' should not be set in hbase-default.xml | Major | conf |
| [HBASE-25476](https://issues.apache.org/jira/browse/HBASE-25476) | Enable error prone check in pre commit | Major | build |
| [HBASE-25211](https://issues.apache.org/jira/browse/HBASE-25211) | Rack awareness in region\_mover | Major | . |
| [HBASE-25483](https://issues.apache.org/jira/browse/HBASE-25483) | set the loadMeta log level to debug. | Major | MTTR, Region Assignment |
| [HBASE-25471](https://issues.apache.org/jira/browse/HBASE-25471) | Move RegionScannerImpl out of HRegion | Major | regionserver |
| [HBASE-25458](https://issues.apache.org/jira/browse/HBASE-25458) | HRegion methods cleanup | Major | regionserver |
| [HBASE-25435](https://issues.apache.org/jira/browse/HBASE-25435) | Slow metric value can be configured | Minor | metrics |
| [HBASE-25318](https://issues.apache.org/jira/browse/HBASE-25318) | Configure where IntegrationTestImportTsv generates HFiles | Minor | integration tests |
| [HBASE-25450](https://issues.apache.org/jira/browse/HBASE-25450) | The parameter "hbase.bucketcache.size" is misdescribed | Major | conf |
| [HBASE-24751](https://issues.apache.org/jira/browse/HBASE-24751) | Display Task completion time and/or processing duration on Web UI | Minor | UI |
| [HBASE-25379](https://issues.apache.org/jira/browse/HBASE-25379) | Make retry pause time configurable for regionserver short operation RPC (reportRegionStateTransition/reportProcedureDone) | Minor | regionserver |
| [HBASE-24850](https://issues.apache.org/jira/browse/HBASE-24850) | CellComparator perf improvement | Critical | Performance, scan |
| [HBASE-25443](https://issues.apache.org/jira/browse/HBASE-25443) | Improve the experience of using the Master webpage by change the loading process of snapshot list to asynchronous | Minor | master, UI |
| [HBASE-25425](https://issues.apache.org/jira/browse/HBASE-25425) | Some notes on RawCell | Trivial | . |
| [HBASE-25084](https://issues.apache.org/jira/browse/HBASE-25084) | RegexStringComparator in ParseFilter should support case-insensitive regexes | Major | Thrift |
| [HBASE-25420](https://issues.apache.org/jira/browse/HBASE-25420) | Some minor improvements in rpc implementation | Minor | rpc |
| [HBASE-25246](https://issues.apache.org/jira/browse/HBASE-25246) | Backup/Restore hbase cell tags. | Major | backup&restore |
| [HBASE-25363](https://issues.apache.org/jira/browse/HBASE-25363) | Improve performance of HFileLinkCleaner by using ReadWriteLock instead of synchronize | Major | master |
| [HBASE-25328](https://issues.apache.org/jira/browse/HBASE-25328) | Add builder method to create Tags. | Minor | . |
| [HBASE-25187](https://issues.apache.org/jira/browse/HBASE-25187) | Improve SizeCachedKV variants initialization | Minor | . |
| [HBASE-23303](https://issues.apache.org/jira/browse/HBASE-23303) | Add security headers to REST server/info page | Major | REST |
### BUG FIXES:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-25970](https://issues.apache.org/jira/browse/HBASE-25970) | MOB data loss - incorrect concatenation of MOB\_FILE\_REFS | Critical | mob |
| [HBASE-24163](https://issues.apache.org/jira/browse/HBASE-24163) | MOB compactor implementations should use format specifiers when calling String.format | Major | Compaction, mob |
| [HBASE-27292](https://issues.apache.org/jira/browse/HBASE-27292) | Fix build failure against Hadoop 3.3.4 due to added dependency on okhttp | Major | build, hadoop3, pom |
| [HBASE-27275](https://issues.apache.org/jira/browse/HBASE-27275) | graceful\_stop.sh unable to restore the balance state | Blocker | regionserver |
| [HBASE-27282](https://issues.apache.org/jira/browse/HBASE-27282) | CME in AuthManager causes region server crash | Major | acl |
| [HBASE-26775](https://issues.apache.org/jira/browse/HBASE-26775) | TestProcedureSchedulerConcurrency fails in pre commit | Major | proc-v2, test |
| [HBASE-27269](https://issues.apache.org/jira/browse/HBASE-27269) | The implementation of TestReplicationStatus.waitOnMetricsReport is incorrect | Major | Replication, test |
| [HBASE-27271](https://issues.apache.org/jira/browse/HBASE-27271) | BufferCallBeforeInitHandler should ignore the flush request | Major | IPC/RPC |
| [HBASE-26977](https://issues.apache.org/jira/browse/HBASE-26977) | HMaster's ShutdownHook does not take effect, if tablesOnMaster is false | Major | master |
| [HBASE-27247](https://issues.apache.org/jira/browse/HBASE-27247) | TestPerTableCFReplication.testParseTableCFsFromConfig is broken because of ReplicationPeerConfigUtil.parseTableCFsFromConfig | Major | Replication |
| [HBASE-27087](https://issues.apache.org/jira/browse/HBASE-27087) | TestQuotaThrottle times out | Major | test |
| [HBASE-27179](https://issues.apache.org/jira/browse/HBASE-27179) | Issues building with OpenJDK 17 | Minor | build |
| [HBASE-27204](https://issues.apache.org/jira/browse/HBASE-27204) | BlockingRpcClient will hang for 20 seconds when SASL is enabled after finishing negotiation | Critical | rpc, sasl, security |
| [HBASE-27075](https://issues.apache.org/jira/browse/HBASE-27075) | TestUpdateRSGroupConfiguration.testCustomOnlineConfigChangeInRSGroup is flaky | Minor | rsgroup, test |
| [HBASE-27219](https://issues.apache.org/jira/browse/HBASE-27219) | Change JONI encoding in RegexStringComparator | Minor | Filters |
| [HBASE-27195](https://issues.apache.org/jira/browse/HBASE-27195) | Clean up netty worker/thread pool configuration | Major | . |
| [HBASE-27211](https://issues.apache.org/jira/browse/HBASE-27211) | Data race in MonitoredTaskImpl could cause split wal failure | Critical | monitoring, wal |
| [HBASE-27053](https://issues.apache.org/jira/browse/HBASE-27053) | IOException during caching of uncompressed block to the block cache. | Major | BlockCache |
| [HBASE-27192](https://issues.apache.org/jira/browse/HBASE-27192) | The retry number for TestSeparateClientZKCluster is too small | Major | test, Zookeeper |
| [HBASE-27193](https://issues.apache.org/jira/browse/HBASE-27193) | TestZooKeeper is flaky | Major | test, Zookeeper |
| [HBASE-27097](https://issues.apache.org/jira/browse/HBASE-27097) | SimpleRpcServer is broken | Blocker | rpc |
| [HBASE-27189](https://issues.apache.org/jira/browse/HBASE-27189) | NettyServerRpcConnection is not properly closed when the netty channel is closed | Blocker | netty, rpc |
| [HBASE-27169](https://issues.apache.org/jira/browse/HBASE-27169) | TestSeparateClientZKCluster is flaky | Major | test |
| [HBASE-27180](https://issues.apache.org/jira/browse/HBASE-27180) | Multiple possible buffer leaks | Major | netty, regionserver |
| [HBASE-26708](https://issues.apache.org/jira/browse/HBASE-26708) | Netty "leak detected" and OutOfDirectMemoryError due to direct memory buffering with SASL implementation | Blocker | netty, rpc, sasl |
| [HBASE-27171](https://issues.apache.org/jira/browse/HBASE-27171) | Fix Annotation Error in HRegionFileSystem | Trivial | . |
| [HBASE-27170](https://issues.apache.org/jira/browse/HBASE-27170) | ByteBuffAllocator leak when decompressing blocks near minSizeForReservoirUse | Major | . |
| [HBASE-27160](https://issues.apache.org/jira/browse/HBASE-27160) | ClientZKSyncer.deleteDataForClientZkUntilSuccess should break from the loop when deletion is succeeded | Major | Client, Zookeeper |
| [HBASE-27001](https://issues.apache.org/jira/browse/HBASE-27001) | The deleted variable cannot be printed out | Minor | . |
| [HBASE-27105](https://issues.apache.org/jira/browse/HBASE-27105) | HBaseInterClusterReplicationEndpoint should honor replication adaptive timeout | Major | Replication |
| [HBASE-27098](https://issues.apache.org/jira/browse/HBASE-27098) | Fix link for field comments | Minor | . |
| [HBASE-27143](https://issues.apache.org/jira/browse/HBASE-27143) | Add hbase-unsafe as a dependency for a MR job triggered by hbase shell | Major | integration tests, mapreduce |
| [HBASE-27099](https://issues.apache.org/jira/browse/HBASE-27099) | In the HFileBlock class, the log printing fspread/fsread cost time unit should be milliseconds | Minor | HFile |
| [HBASE-27128](https://issues.apache.org/jira/browse/HBASE-27128) | when open archiveRetries totalLogSize calculation mistake | Minor | wal |
| [HBASE-27117](https://issues.apache.org/jira/browse/HBASE-27117) | Update the method comments for RegionServerAccounting | Minor | . |
| [HBASE-27103](https://issues.apache.org/jira/browse/HBASE-27103) | All MR UTs are broken because of ClassNotFound | Critical | hadoop3, test |
| [HBASE-27066](https://issues.apache.org/jira/browse/HBASE-27066) | The Region Visualizer display failed | Major | . |
| [HBASE-27038](https://issues.apache.org/jira/browse/HBASE-27038) | CellComparator should extend Serializable | Minor | . |
| [HBASE-27017](https://issues.apache.org/jira/browse/HBASE-27017) | MOB snapshot is broken when FileBased SFT is used | Major | mob |
| [HBASE-26985](https://issues.apache.org/jira/browse/HBASE-26985) | SecureBulkLoadManager will set wrong permission if umask too strict | Major | regionserver |
| [HBASE-27081](https://issues.apache.org/jira/browse/HBASE-27081) | Fix disallowed compatibility breaks on branch-2.5 and branch-2 | Blocker | . |
| [HBASE-27079](https://issues.apache.org/jira/browse/HBASE-27079) | Lower some DEBUG level logs in ReplicationSourceWALReader to TRACE | Minor | . |
| [HBASE-27068](https://issues.apache.org/jira/browse/HBASE-27068) | NPE occurs when the active master has not yet been elected | Major | . |
| [HBASE-27064](https://issues.apache.org/jira/browse/HBASE-27064) | CME in TestRegionNormalizerWorkQueue | Minor | test |
| [HBASE-27069](https://issues.apache.org/jira/browse/HBASE-27069) | Hbase SecureBulkload permission regression | Major | . |
| [HBASE-27065](https://issues.apache.org/jira/browse/HBASE-27065) | Build against Hadoop 3.3.3 | Major | build |
| [HBASE-26854](https://issues.apache.org/jira/browse/HBASE-26854) | Shell startup logs a bunch of noise | Major | . |
| [HBASE-27061](https://issues.apache.org/jira/browse/HBASE-27061) | two phase bulkload is broken when SFT is in use. | Major | . |
| [HBASE-27055](https://issues.apache.org/jira/browse/HBASE-27055) | Add additional comments when using HBASE\_TRACE\_OPTS with standalone mode | Minor | tracing |
| [HBASE-27030](https://issues.apache.org/jira/browse/HBASE-27030) | Fix undefined local variable error in draining\_servers.rb | Major | jruby, shell |
| [HBASE-27047](https://issues.apache.org/jira/browse/HBASE-27047) | Fix typo for metric drainingRegionServers | Minor | metrics |
| [HBASE-27027](https://issues.apache.org/jira/browse/HBASE-27027) | Deprecated jetty SslContextFactory cause HMaster startup failure due to multiple certificates in KeyStores | Major | security |
| [HBASE-27032](https://issues.apache.org/jira/browse/HBASE-27032) | The draining region servers metric description is incorrect | Minor | . |
| [HBASE-27019](https://issues.apache.org/jira/browse/HBASE-27019) | Minor compression performance improvements | Trivial | . |
| [HBASE-26905](https://issues.apache.org/jira/browse/HBASE-26905) | ReplicationPeerManager#checkPeerExists should throw ReplicationPeerNotFoundException if peer doesn't exists | Major | Replication |
| [HBASE-27021](https://issues.apache.org/jira/browse/HBASE-27021) | StoreFileInfo should set its initialPath in a consistent way | Major | . |
| [HBASE-26994](https://issues.apache.org/jira/browse/HBASE-26994) | MasterFileSystem create directory without permission check | Major | master |
| [HBASE-26963](https://issues.apache.org/jira/browse/HBASE-26963) | ReplicationSource#removePeer hangs if we try to remove bad peer. | Major | regionserver, Replication |
| [HBASE-27000](https://issues.apache.org/jira/browse/HBASE-27000) | Block cache stats (Misses Caching) display error in RS web UI | Major | . |
| [HBASE-26984](https://issues.apache.org/jira/browse/HBASE-26984) | Chaos Monkey thread dies in ITBLL Chaos GracefulRollingRestartRsAction | Major | integration tests |
| [HBASE-26992](https://issues.apache.org/jira/browse/HBASE-26992) | Brotli compressor has unexpected behavior during reinitialization | Minor | . |
| [HBASE-26988](https://issues.apache.org/jira/browse/HBASE-26988) | Balancer should reset to default setting for hbase.master.loadbalance.bytable if dynamically reloading configuration | Minor | Balancer |
| [HBASE-26917](https://issues.apache.org/jira/browse/HBASE-26917) | Do not add --threads when running 'mvn site' | Major | build, scripts |
| [HBASE-22349](https://issues.apache.org/jira/browse/HBASE-22349) | Stochastic Load Balancer skips balancing when node is replaced in cluster | Major | Balancer |
| [HBASE-26979](https://issues.apache.org/jira/browse/HBASE-26979) | StoreFileListFile logs frequent stacktraces at INFO level | Minor | . |
| [HBASE-26941](https://issues.apache.org/jira/browse/HBASE-26941) | LocalHBaseCluster.waitOnRegionServer should not call join while interrupted | Critical | test |
| [HBASE-26938](https://issues.apache.org/jira/browse/HBASE-26938) | Compaction failures after StoreFileTracker integration | Blocker | Compaction |
| [HBASE-26944](https://issues.apache.org/jira/browse/HBASE-26944) | Possible resource leak while creating new region scanner | Major | . |
| [HBASE-26895](https://issues.apache.org/jira/browse/HBASE-26895) | on hbase shell, 'delete/deleteall' for a columnfamily is not working | Major | shell |
| [HBASE-26901](https://issues.apache.org/jira/browse/HBASE-26901) | delete with null columnQualifier occurs NullPointerException when NewVersionBehavior is on | Major | Deletes, Scanners |
| [HBASE-26880](https://issues.apache.org/jira/browse/HBASE-26880) | Misspelling commands in hbase shell will crash the shell | Minor | shell |
| [HBASE-26939](https://issues.apache.org/jira/browse/HBASE-26939) | Typo in admin.rb "COMPRESSION\_COMPACT\_MAJPR" | Trivial | . |
| [HBASE-26924](https://issues.apache.org/jira/browse/HBASE-26924) | [Documentation] Fix log parameter error and spelling error | Trivial | logging |
| [HBASE-26811](https://issues.apache.org/jira/browse/HBASE-26811) | Secondary replica may be disabled for read incorrectly forever | Major | read replicas |
| [HBASE-26812](https://issues.apache.org/jira/browse/HBASE-26812) | ShortCircuitingClusterConnection fails to close RegionScanners when making short-circuited calls | Critical | . |
| [HBASE-26838](https://issues.apache.org/jira/browse/HBASE-26838) | Junit jar is not included in the hbase tar ball, causing issues for some hbase tools that do rely on it | Major | integration tests, tooling |
| [HBASE-26871](https://issues.apache.org/jira/browse/HBASE-26871) | shaded mapreduce and shaded byo-hadoop client artifacts contains no classes | Blocker | integration tests, jenkins, mapreduce |
| [HBASE-26896](https://issues.apache.org/jira/browse/HBASE-26896) | list\_quota\_snapshots fails with ‘ERROR NameError: uninitialized constant Shell::Commands::ListQuotaSnapshots::TABLE’ | Major | shell |
| [HBASE-26718](https://issues.apache.org/jira/browse/HBASE-26718) | HFileArchiver can remove referenced StoreFiles from the archive | Major | Compaction, HFile, snapshots |
| [HBASE-26864](https://issues.apache.org/jira/browse/HBASE-26864) | SplitTableRegionProcedure calls openParentRegions() at a wrong state during rollback. | Major | Region Assignment |
| [HBASE-26876](https://issues.apache.org/jira/browse/HBASE-26876) | Use toStringBinary for rowkey in RegionServerCallable error string | Minor | . |
| [HBASE-26875](https://issues.apache.org/jira/browse/HBASE-26875) | RpcRetryingCallerImpl translateException ignores return value of recursive call | Minor | . |
| [HBASE-26869](https://issues.apache.org/jira/browse/HBASE-26869) | RSRpcServices.scan should deep clone cells when RpcCallContext is null | Major | regionserver |
| [HBASE-26870](https://issues.apache.org/jira/browse/HBASE-26870) | Log4j2 integration is incorrect in nighly's client integration test | Critical | jenkins, logging |
| [HBASE-26840](https://issues.apache.org/jira/browse/HBASE-26840) | Fix NPE in the retry of logroller | Minor | wal |
| [HBASE-26670](https://issues.apache.org/jira/browse/HBASE-26670) | HFileLinkCleaner should be added even if snapshot is disabled | Critical | snapshots |
| [HBASE-26761](https://issues.apache.org/jira/browse/HBASE-26761) | TestMobStoreScanner (testGetMassive) can OOME | Minor | mob, test |
| [HBASE-26816](https://issues.apache.org/jira/browse/HBASE-26816) | Fix CME in ReplicationSourceManager | Minor | Replication |
| [HBASE-26715](https://issues.apache.org/jira/browse/HBASE-26715) | Blocked on SyncFuture in AsyncProtobufLogWriter#write | Major | . |
| [HBASE-26804](https://issues.apache.org/jira/browse/HBASE-26804) | Missing opentelemetry agent in hadoop-two-compat.xml | Blocker | tracing |
| [HBASE-26815](https://issues.apache.org/jira/browse/HBASE-26815) | TestFanOutOneBlockAsyncDFSOutput is flakey | Major | test |
| [HBASE-26783](https://issues.apache.org/jira/browse/HBASE-26783) | ScannerCallable doubly clears meta cache on retries | Major | . |
| [HBASE-26777](https://issues.apache.org/jira/browse/HBASE-26777) | BufferedDataBlockEncoder$OffheapDecodedExtendedCell.deepClone throws UnsupportedOperationException | Major | regionserver |
| [HBASE-26745](https://issues.apache.org/jira/browse/HBASE-26745) | MetricsStochasticBalancerSource metrics don't render in /jmx endpoint | Minor | . |
| [HBASE-26776](https://issues.apache.org/jira/browse/HBASE-26776) | RpcServer failure to SASL handshake always logs user "unknown" to audit log | Major | security |
| [HBASE-26772](https://issues.apache.org/jira/browse/HBASE-26772) | Shell suspended in background | Minor | shell |
| [HBASE-26767](https://issues.apache.org/jira/browse/HBASE-26767) | Rest server should not use a large Header Cache. | Major | REST |
| [HBASE-26546](https://issues.apache.org/jira/browse/HBASE-26546) | hbase-shaded-client missing required thirdparty classes under hadoop 3.3.1 | Major | Client, hadoop3, shading |
| [HBASE-26727](https://issues.apache.org/jira/browse/HBASE-26727) | Fix CallDroppedException reporting | Minor | . |
| [HBASE-26712](https://issues.apache.org/jira/browse/HBASE-26712) | Balancer encounters NPE in rare case | Major | . |
| [HBASE-26742](https://issues.apache.org/jira/browse/HBASE-26742) | Comparator of NOT\_EQUAL NULL is invalid for checkAndMutate | Major | . |
| [HBASE-26688](https://issues.apache.org/jira/browse/HBASE-26688) | Threads shared EMPTY\_RESULT may lead to unexpected client job down. | Major | Client |
| [HBASE-26741](https://issues.apache.org/jira/browse/HBASE-26741) | Incorrect exception handling in shell | Critical | shell |
| [HBASE-26729](https://issues.apache.org/jira/browse/HBASE-26729) | Backport "HBASE-26714 Introduce path configuration for system coprocessors" to branch-2 | Major | Coprocessors |
| [HBASE-26713](https://issues.apache.org/jira/browse/HBASE-26713) | Increments submitted by 1.x clients will be stored with timestamp 0 on 2.x+ clusters | Major | . |
| [HBASE-26679](https://issues.apache.org/jira/browse/HBASE-26679) | Wait on the future returned by FanOutOneBlockAsyncDFSOutput.flush would stuck | Critical | wal |
| [HBASE-26662](https://issues.apache.org/jira/browse/HBASE-26662) | User.createUserForTesting should not reset UserProvider.groups every time if hbase.group.service.for.test.only is true | Major | . |
| [HBASE-26671](https://issues.apache.org/jira/browse/HBASE-26671) | Misspellings of hbck usage | Minor | hbck |
| [HBASE-26469](https://issues.apache.org/jira/browse/HBASE-26469) | correct HBase shell exit behavior to match code passed to exit | Critical | shell |
| [HBASE-26543](https://issues.apache.org/jira/browse/HBASE-26543) | correct parsing of hbase shell args with GetoptLong | Blocker | shell |
| [HBASE-26643](https://issues.apache.org/jira/browse/HBASE-26643) | LoadBalancer should not return empty map | Critical | proc-v2, Region Assignment, test |
| [HBASE-26646](https://issues.apache.org/jira/browse/HBASE-26646) | WALPlayer should obtain token from filesystem | Minor | . |
| [HBASE-26494](https://issues.apache.org/jira/browse/HBASE-26494) | Using RefCnt to fix the flawed MemStoreLABImpl | Major | regionserver |
| [HBASE-26625](https://issues.apache.org/jira/browse/HBASE-26625) | ExportSnapshot tool failed to copy data files for tables with merge region | Minor | . |
| [HBASE-26615](https://issues.apache.org/jira/browse/HBASE-26615) | Snapshot referenced data files are deleted when delete a table with merge regions | Major | . |
| [HBASE-26613](https://issues.apache.org/jira/browse/HBASE-26613) | The logic of the method incrementIV in Encryption class has problem | Major | Performance, security |
| [HBASE-26488](https://issues.apache.org/jira/browse/HBASE-26488) | Memory leak when MemStore retry flushing | Major | regionserver |
| [HBASE-26340](https://issues.apache.org/jira/browse/HBASE-26340) | TableSplit returns false size under 1MB | Major | mapreduce, regionserver |
| [HBASE-26537](https://issues.apache.org/jira/browse/HBASE-26537) | FuzzyRowFilter backwards compatibility | Major | . |
| [HBASE-26550](https://issues.apache.org/jira/browse/HBASE-26550) | Make sure the master is running normally before accepting a balance command | Minor | Balancer, master |
| [HBASE-26541](https://issues.apache.org/jira/browse/HBASE-26541) | hbase-protocol-shaded not buildable on M1 MacOSX | Major | . |
| [HBASE-26527](https://issues.apache.org/jira/browse/HBASE-26527) | ArrayIndexOutOfBoundsException in KeyValueUtil.copyToNewKeyValue() | Major | wal |
| [HBASE-26462](https://issues.apache.org/jira/browse/HBASE-26462) | Should persist restoreAcl flag in the procedure state for CloneSnapshotProcedure and RestoreSnapshotProcedure | Critical | proc-v2, snapshots |
| [HBASE-26535](https://issues.apache.org/jira/browse/HBASE-26535) | [site, branch-2] DependencyManagement report is broken | Blocker | build, pom |
| [HBASE-26533](https://issues.apache.org/jira/browse/HBASE-26533) | KeyValueScanner might not be properly closed when using InternalScan.checkOnlyMemStore() | Minor | . |
| [HBASE-26482](https://issues.apache.org/jira/browse/HBASE-26482) | HMaster may clean wals that is replicating in rare cases | Critical | Replication |
| [HBASE-26468](https://issues.apache.org/jira/browse/HBASE-26468) | Region Server doesn't exit cleanly incase it crashes. | Major | regionserver |
| [HBASE-25905](https://issues.apache.org/jira/browse/HBASE-25905) | Shutdown of WAL stuck at waitForSafePoint | Blocker | regionserver, wal |
| [HBASE-26455](https://issues.apache.org/jira/browse/HBASE-26455) | TestStochasticLoadBalancerRegionReplicaWithRacks fails consistently | Major | Balancer |
| [HBASE-26450](https://issues.apache.org/jira/browse/HBASE-26450) | Server configuration will overwrite HStore configuration after using shell command 'update\_config' | Minor | Compaction, conf, regionserver |
| [HBASE-26476](https://issues.apache.org/jira/browse/HBASE-26476) | Make DefaultMemStore extensible for HStore.memstore | Major | regionserver |
| [HBASE-26465](https://issues.apache.org/jira/browse/HBASE-26465) | MemStoreLAB may be released early when its SegmentScanner is scanning | Critical | regionserver |
| [HBASE-26467](https://issues.apache.org/jira/browse/HBASE-26467) | Wrong Cell Generated by MemStoreLABImpl.forceCopyOfBigCellInto when Cell size bigger than data chunk size | Critical | in-memory-compaction |
| [HBASE-26463](https://issues.apache.org/jira/browse/HBASE-26463) | Unreadable table names after HBASE-24605 | Trivial | UI |
| [HBASE-26438](https://issues.apache.org/jira/browse/HBASE-26438) | Fix flaky test TestHStore.testCompactingMemStoreCellExceedInmemoryFlushSize | Major | test |
| [HBASE-26436](https://issues.apache.org/jira/browse/HBASE-26436) | check-aggregate-license error related to javadns after HADOOP-17317 | Major | build, hadoop3 |
| [HBASE-26311](https://issues.apache.org/jira/browse/HBASE-26311) | Balancer gets stuck in cohosted replica distribution | Major | Balancer |
| [HBASE-26384](https://issues.apache.org/jira/browse/HBASE-26384) | Segment already flushed to hfile may still be remained in CompactingMemStore | Major | in-memory-compaction |
| [HBASE-26414](https://issues.apache.org/jira/browse/HBASE-26414) | Tracing INSTRUMENTATION\_NAME is incorrect | Blocker | tracing |
| [HBASE-26410](https://issues.apache.org/jira/browse/HBASE-26410) | Fix HBase TestCanaryTool for Java17 | Major | java |
| [HBASE-26429](https://issues.apache.org/jira/browse/HBASE-26429) | HeapMemoryManager fails memstore flushes with NPE if enabled | Major | Operability, regionserver |
| [HBASE-26404](https://issues.apache.org/jira/browse/HBASE-26404) | Update javadoc for CellUtil#createCell with tags methods. | Major | . |
| [HBASE-26398](https://issues.apache.org/jira/browse/HBASE-26398) | CellCounter fails for large tables filling up local disk | Minor | mapreduce |
| [HBASE-26190](https://issues.apache.org/jira/browse/HBASE-26190) | High rate logging of BucketAllocatorException: Allocation too big | Major | BucketCache, Operability |
| [HBASE-26392](https://issues.apache.org/jira/browse/HBASE-26392) | Update ClassSize.BYTE\_BUFFER for JDK17 | Major | java, util |
| [HBASE-26394](https://issues.apache.org/jira/browse/HBASE-26394) | Cache in RSRpcServices.executeProcedures does not take effect | Major | . |
| [HBASE-26385](https://issues.apache.org/jira/browse/HBASE-26385) | Clear CellScanner when replay | Major | regionserver, rpc |
| [HBASE-26383](https://issues.apache.org/jira/browse/HBASE-26383) | HBCK incorrectly reports inconsistencies for recently split regions following a master failover | Critical | master |
| [HBASE-26371](https://issues.apache.org/jira/browse/HBASE-26371) | Prioritize meta region move over other region moves in region\_mover | Major | . |
| [HBASE-26361](https://issues.apache.org/jira/browse/HBASE-26361) | Enable OpenTelemetry to be used from developer sandbox | Major | tracing |
| [HBASE-26364](https://issues.apache.org/jira/browse/HBASE-26364) | TestThriftServer is failing 100% in our flaky test job | Major | test, Thrift |
| [HBASE-26350](https://issues.apache.org/jira/browse/HBASE-26350) | Missing server side debugging on failed SASL handshake | Minor | . |
| [HBASE-26344](https://issues.apache.org/jira/browse/HBASE-26344) | Fix Bug for MultiByteBuff.put(int, byte) | Major | . |
| [HBASE-26312](https://issues.apache.org/jira/browse/HBASE-26312) | Shell scan fails with timestamp | Major | shell, test |
| [HBASE-24601](https://issues.apache.org/jira/browse/HBASE-24601) | Change default Hfile storage policy from HOT to NONE for HDFS | Major | HFile |
| [HBASE-26295](https://issues.apache.org/jira/browse/HBASE-26295) | BucketCache could not free BucketEntry which restored from persistence file | Major | BucketCache |
| [HBASE-26289](https://issues.apache.org/jira/browse/HBASE-26289) | Hbase scan setMaxResultsPerColumnFamily not giving right results | Major | regionserver |
| [HBASE-26299](https://issues.apache.org/jira/browse/HBASE-26299) | Fix TestHTableTracing.testTableClose for nightly build of branch-2 | Major | test, tracing |
| [HBASE-26238](https://issues.apache.org/jira/browse/HBASE-26238) | OOME in VerifyReplication for the table contains rows with 10M+ cells | Major | Client, Replication |
| [HBASE-26297](https://issues.apache.org/jira/browse/HBASE-26297) | Balancer run is improperly triggered by accuracy error of double comparison | Major | Balancer |
| [HBASE-26178](https://issues.apache.org/jira/browse/HBASE-26178) | Improve data structure and algorithm for BalanceClusterState to improve computation speed for large cluster | Major | Balancer, Performance |
| [HBASE-26274](https://issues.apache.org/jira/browse/HBASE-26274) | Create an option to reintroduce BlockCache to mapreduce job | Major | BlockCache, HFile, mapreduce |
| [HBASE-26261](https://issues.apache.org/jira/browse/HBASE-26261) | Store configuration loss when use update\_config | Minor | . |
| [HBASE-26281](https://issues.apache.org/jira/browse/HBASE-26281) | DBB got from BucketCache would be freed unexpectedly before RPC completed | Critical | BucketCache |
| [HBASE-26197](https://issues.apache.org/jira/browse/HBASE-26197) | Fix some obvious bugs in MultiByteBuff.put | Major | . |
| [HBASE-26106](https://issues.apache.org/jira/browse/HBASE-26106) | AbstractFSWALProvider#getArchivedLogPath doesn't look for wal file in all oldWALs directory. | Critical | wal |
| [HBASE-26205](https://issues.apache.org/jira/browse/HBASE-26205) | TableMRUtil#initCredentialsForCluster should use specified conf for UserProvider | Major | mapreduce |
| [HBASE-26210](https://issues.apache.org/jira/browse/HBASE-26210) | HBase Write should be doomed to hang when cell size exceeds InmemoryFlushSize for CompactingMemStore | Critical | in-memory-compaction |
| [HBASE-26244](https://issues.apache.org/jira/browse/HBASE-26244) | Avoid trim the error stack trace when running UT with maven | Major | . |
| [HBASE-25588](https://issues.apache.org/jira/browse/HBASE-25588) | Excessive logging of "hbase.zookeeper.useMulti is deprecated. Default to true always." | Minor | logging, Operability, Replication |
| [HBASE-26232](https://issues.apache.org/jira/browse/HBASE-26232) | SEEK\_NEXT\_USING\_HINT is ignored on reversed Scans | Critical | Filters, scan |
| [HBASE-26204](https://issues.apache.org/jira/browse/HBASE-26204) | VerifyReplication should obtain token for peerQuorumAddress too | Major | . |
| [HBASE-26219](https://issues.apache.org/jira/browse/HBASE-26219) | Negative time is logged while waiting on regionservers | Trivial | . |
| [HBASE-26087](https://issues.apache.org/jira/browse/HBASE-26087) | JVM crash when displaying RPC params by MonitoredRPCHandler | Major | UI |
| [HBASE-24570](https://issues.apache.org/jira/browse/HBASE-24570) | connection#close throws NPE | Minor | Client |
| [HBASE-26200](https://issues.apache.org/jira/browse/HBASE-26200) | Undo 'HBASE-25165 Change 'State time' in UI so sorts (#2508)' in favor of HBASE-24652 | Major | UI |
| [HBASE-26196](https://issues.apache.org/jira/browse/HBASE-26196) | Support configuration override for remote cluster of HFileOutputFormat locality sensitive | Major | mapreduce |
| [HBASE-26026](https://issues.apache.org/jira/browse/HBASE-26026) | HBase Write may be stuck forever when using CompactingMemStore | Critical | in-memory-compaction |
| [HBASE-26155](https://issues.apache.org/jira/browse/HBASE-26155) | JVM crash when scan | Major | Scanners |
| [HBASE-26176](https://issues.apache.org/jira/browse/HBASE-26176) | Correct regex in hbase-personality.sh | Minor | build |
| [HBASE-26142](https://issues.apache.org/jira/browse/HBASE-26142) | NullPointerException when set 'hbase.hregion.memstore.mslab.indexchunksize.percent' to zero | Critical | . |
| [HBASE-25651](https://issues.apache.org/jira/browse/HBASE-25651) | NORMALIZER\_TARGET\_REGION\_SIZE needs a unit in its name | Major | Normalizer |
| [HBASE-26166](https://issues.apache.org/jira/browse/HBASE-26166) | table list in master ui has a minor bug | Minor | UI |
| [HBASE-26114](https://issues.apache.org/jira/browse/HBASE-26114) | when “hbase.mob.compaction.threads.max” is set to a negative number, HMaster cannot start normally | Minor | master |
| [HBASE-26120](https://issues.apache.org/jira/browse/HBASE-26120) | New replication gets stuck or data loss when multiwal groups more than 10 | Critical | Replication |
| [HBASE-26001](https://issues.apache.org/jira/browse/HBASE-26001) | When turn on access control, the cell level TTL of Increment and Append operations is invalid. | Minor | Coprocessors |
| [HBASE-24984](https://issues.apache.org/jira/browse/HBASE-24984) | WAL corruption due to early DBBs re-use when Durability.ASYNC\_WAL is used with multi operation | Critical | rpc, wal |
| [HBASE-26088](https://issues.apache.org/jira/browse/HBASE-26088) | conn.getBufferedMutator(tableName) leaks thread executors and other problems | Critical | Client |
| [HBASE-25973](https://issues.apache.org/jira/browse/HBASE-25973) | Balancer should explain progress in a better way in log | Major | Balancer |
| [HBASE-26086](https://issues.apache.org/jira/browse/HBASE-26086) | TestHRegionReplayEvents do not pass in branch-2 and throws NullPointerException | Minor | . |
| [HBASE-26036](https://issues.apache.org/jira/browse/HBASE-26036) | DBB released too early and dirty data for some operations | Critical | rpc |
| [HBASE-26068](https://issues.apache.org/jira/browse/HBASE-26068) | The last assertion in TestHStore.testRefreshStoreFilesNotChanged is wrong | Major | test |
| [HBASE-22923](https://issues.apache.org/jira/browse/HBASE-22923) | hbase:meta is assigned to localhost when we downgrade the hbase version | Major | . |
| [HBASE-26063](https://issues.apache.org/jira/browse/HBASE-26063) | The current checkcompatibility.py script can not compare master and rel/2.0.0 | Blocker | scripts |
| [HBASE-26030](https://issues.apache.org/jira/browse/HBASE-26030) | hbase-cleanup.sh did not clean the wal dir if hbase.wal.dir configured individually | Major | scripts |
| [HBASE-26035](https://issues.apache.org/jira/browse/HBASE-26035) | Redundant null check in the compareTo function | Minor | metrics, Performance |
| [HBASE-25902](https://issues.apache.org/jira/browse/HBASE-25902) | Add missing CFs in meta during HBase 1 to 2.3+ Upgrade | Critical | meta, Operability |
| [HBASE-26028](https://issues.apache.org/jira/browse/HBASE-26028) | The view as json page shows exception when using TinyLfuBlockCache | Major | UI |
| [HBASE-26029](https://issues.apache.org/jira/browse/HBASE-26029) | It is not reliable to use nodeDeleted event to track region server's death | Critical | Replication, Zookeeper |
| [HBASE-26039](https://issues.apache.org/jira/browse/HBASE-26039) | TestReplicationKillRS is useless after HBASE-23956 | Major | Replication, test |
| [HBASE-25980](https://issues.apache.org/jira/browse/HBASE-25980) | Master table.jsp pointed at meta throws 500 when no all replicas are online | Major | master, meta replicas, UI |
| [HBASE-26013](https://issues.apache.org/jira/browse/HBASE-26013) | Get operations readRows metrics becomes zero after HBASE-25677 | Minor | metrics |
| [HBASE-25966](https://issues.apache.org/jira/browse/HBASE-25966) | Fix typo in NOTICE.vm | Major | build, community |
| [HBASE-25877](https://issues.apache.org/jira/browse/HBASE-25877) | Add access check for compactionSwitch | Major | security |
| [HBASE-25698](https://issues.apache.org/jira/browse/HBASE-25698) | Persistent IllegalReferenceCountException at scanner open when using TinyLfuBlockCache | Major | BucketCache, HFile, Scanners |
| [HBASE-25984](https://issues.apache.org/jira/browse/HBASE-25984) | FSHLog WAL lockup with sync future reuse [RS deadlock] | Critical | regionserver, wal |
| [HBASE-25994](https://issues.apache.org/jira/browse/HBASE-25994) | Active WAL tailing fails when WAL value compression is enabled | Major | . |
| [HBASE-25924](https://issues.apache.org/jira/browse/HBASE-25924) | Seeing a spike in uncleanlyClosedWALs metric. | Major | Replication, wal |
| [HBASE-25967](https://issues.apache.org/jira/browse/HBASE-25967) | The readRequestsCount does not calculate when the outResults is empty | Major | metrics |
| [HBASE-25981](https://issues.apache.org/jira/browse/HBASE-25981) | JVM crash when displaying regionserver UI | Major | rpc, UI |
| [HBASE-25930](https://issues.apache.org/jira/browse/HBASE-25930) | Thrift does not support requests in Kerberos environment | Major | Thrift |
| [HBASE-25929](https://issues.apache.org/jira/browse/HBASE-25929) | RegionServer JVM crash when compaction | Critical | Compaction |
| [HBASE-25932](https://issues.apache.org/jira/browse/HBASE-25932) | TestWALEntryStream#testCleanClosedWALs test is failing. | Major | metrics, Replication, wal |
| [HBASE-25903](https://issues.apache.org/jira/browse/HBASE-25903) | ReadOnlyZKClient APIs - CompletableFuture.get() calls can cause threads to hang forver when ZK client create throws Non IOException | Major | . |
| [HBASE-25927](https://issues.apache.org/jira/browse/HBASE-25927) | Fix the log messages by not stringifying the exceptions in log | Minor | logging |
| [HBASE-25938](https://issues.apache.org/jira/browse/HBASE-25938) | The SnapshotOfRegionAssignmentFromMeta.initialize call in FavoredNodeLoadBalancer is just a dummy one | Major | Balancer, FavoredNodes |
| [HBASE-25861](https://issues.apache.org/jira/browse/HBASE-25861) | Correct the usage of Configuration#addDeprecation | Major | . |
| [HBASE-25928](https://issues.apache.org/jira/browse/HBASE-25928) | TestHBaseConfiguration#testDeprecatedConfigurations is broken with Hadoop 3.3 | Major | . |
| [HBASE-25898](https://issues.apache.org/jira/browse/HBASE-25898) | RS getting aborted due to NPE in Replication WALEntryStream | Critical | Replication |
| [HBASE-25875](https://issues.apache.org/jira/browse/HBASE-25875) | RegionServer failed to start due to IllegalThreadStateException in AuthenticationTokenSecretManager.start | Major | . |
| [HBASE-25513](https://issues.apache.org/jira/browse/HBASE-25513) | When the table is turned on normalize, the first region may not be merged even the size is 0 | Major | Normalizer |
| [HBASE-25892](https://issues.apache.org/jira/browse/HBASE-25892) | 'False' should be 'True' in auditlog of listLabels | Major | logging, security |
| [HBASE-25817](https://issues.apache.org/jira/browse/HBASE-25817) | Memory leak from thrift server hashMap | Minor | Thrift |
| [HBASE-25869](https://issues.apache.org/jira/browse/HBASE-25869) | WAL value compression | Major | Operability, wal |
| [HBASE-25827](https://issues.apache.org/jira/browse/HBASE-25827) | Per Cell TTL tags get duplicated with increments causing tags length overflow | Critical | regionserver |
| [HBASE-25897](https://issues.apache.org/jira/browse/HBASE-25897) | TestRetainAssignmentOnRestart is flaky after HBASE-25032 | Major | Region Assignment |
| [HBASE-25867](https://issues.apache.org/jira/browse/HBASE-25867) | Extra doc around ITBLL | Minor | documentation |
| [HBASE-25859](https://issues.apache.org/jira/browse/HBASE-25859) | Reference class incorrectly parses the protobuf magic marker | Minor | regionserver |
| [HBASE-25774](https://issues.apache.org/jira/browse/HBASE-25774) | ServerManager.getOnlineServer may miss some region servers when refreshing state in some procedure implementations | Critical | Replication |
| [HBASE-25837](https://issues.apache.org/jira/browse/HBASE-25837) | TestRollingRestart is flaky | Major | test |
| [HBASE-25850](https://issues.apache.org/jira/browse/HBASE-25850) | Fix spotbugs warnings on branch-2 | Major | Compaction, findbugs, mob |
| [HBASE-25825](https://issues.apache.org/jira/browse/HBASE-25825) | RSGroupBasedLoadBalancer.onConfigurationChange should chain the request to internal balancer | Major | Balancer |
| [HBASE-25792](https://issues.apache.org/jira/browse/HBASE-25792) | Filter out o.a.hadoop.thirdparty building shaded jars | Major | shading |
| [HBASE-25777](https://issues.apache.org/jira/browse/HBASE-25777) | Fix wrong initialization value in StressAssignmentManagerMonkeyFactory | Major | integration tests |
| [HBASE-25735](https://issues.apache.org/jira/browse/HBASE-25735) | Add target Region to connection exceptions | Major | rpc |
| [HBASE-25717](https://issues.apache.org/jira/browse/HBASE-25717) | RegionServer aborted due to ClassCastException | Major | . |
| [HBASE-25743](https://issues.apache.org/jira/browse/HBASE-25743) | Retry REQUESTTIMEOUT KeeperExceptions from ZK | Major | Zookeeper |
| [HBASE-25726](https://issues.apache.org/jira/browse/HBASE-25726) | MoveCostFunction is not included in the list of cost functions for StochasticLoadBalancer | Major | Balancer |
| [HBASE-25692](https://issues.apache.org/jira/browse/HBASE-25692) | Failure to instantiate WALCellCodec leaks socket in replication | Major | Replication |
| [HBASE-25568](https://issues.apache.org/jira/browse/HBASE-25568) | Upgrade Thrift jar to fix CVE-2020-13949 | Critical | Thrift |
| [HBASE-25693](https://issues.apache.org/jira/browse/HBASE-25693) | NPE getting metrics from standby masters (MetricsMasterWrapperImpl.getMergePlanCount) | Major | master |
| [HBASE-25685](https://issues.apache.org/jira/browse/HBASE-25685) | asyncprofiler2.0 no longer supports svg; wants html | Major | . |
| [HBASE-25594](https://issues.apache.org/jira/browse/HBASE-25594) | graceful\_stop.sh fails to unload regions when ran at localhost | Minor | . |
| [HBASE-25674](https://issues.apache.org/jira/browse/HBASE-25674) | RegionInfo.parseFrom(DataInputStream) sometimes fails to read the protobuf magic marker | Minor | Client |
| [HBASE-25673](https://issues.apache.org/jira/browse/HBASE-25673) | Wrong log regarding current active master at ZKLeaderManager#waitToBecomeLeader | Minor | . |
| [HBASE-25595](https://issues.apache.org/jira/browse/HBASE-25595) | TestLruBlockCache.testBackgroundEvictionThread is flaky | Major | . |
| [HBASE-25662](https://issues.apache.org/jira/browse/HBASE-25662) | Fix spotbugs warning in RoundRobinTableInputFormat | Major | findbugs |
| [HBASE-25657](https://issues.apache.org/jira/browse/HBASE-25657) | Fix spotbugs warnings after upgrading spotbugs to 4.x | Major | findbugs |
| [HBASE-25646](https://issues.apache.org/jira/browse/HBASE-25646) | Possible Resource Leak in CatalogJanitor | Major | master |
| [HBASE-25626](https://issues.apache.org/jira/browse/HBASE-25626) | Possible Resource Leak in HeterogeneousRegionCountCostFunction | Major | . |
| [HBASE-25644](https://issues.apache.org/jira/browse/HBASE-25644) | Scan#setSmall blindly sets ReadType as PREAD | Critical | . |
| [HBASE-25609](https://issues.apache.org/jira/browse/HBASE-25609) | There is a problem with the SPLITS\_FILE in the HBase shell statement | Minor | shell |
| [HBASE-25385](https://issues.apache.org/jira/browse/HBASE-25385) | TestCurrentHourProvider fails if the latest timezone changes are not present | Blocker | . |
| [HBASE-25596](https://issues.apache.org/jira/browse/HBASE-25596) | Fix NPE in ReplicationSourceManager as well as avoid permanently unreplicated data due to EOFException from WAL | Critical | Replication |
| [HBASE-25367](https://issues.apache.org/jira/browse/HBASE-25367) | Sort broken after Change 'State time' in UI | Major | UI |
| [HBASE-25421](https://issues.apache.org/jira/browse/HBASE-25421) | There is no limit on the column family length when creating a table | Major | Client |
| [HBASE-25371](https://issues.apache.org/jira/browse/HBASE-25371) | When openRegion fails during initial verification(before initializing and setting seq num), exception is observed during region close. | Major | Region Assignment |
| [HBASE-25611](https://issues.apache.org/jira/browse/HBASE-25611) | ExportSnapshot chmod flag uses value as decimal | Major | . |
| [HBASE-25586](https://issues.apache.org/jira/browse/HBASE-25586) | Fix HBASE-22492 on branch-2 (SASL GapToken) | Major | rpc |
| [HBASE-25556](https://issues.apache.org/jira/browse/HBASE-25556) | Frequent replication "Encountered a malformed edit" warnings | Minor | Operability, Replication |
| [HBASE-25575](https://issues.apache.org/jira/browse/HBASE-25575) | Should validate Puts in RowMutations | Minor | Client |
| [HBASE-25571](https://issues.apache.org/jira/browse/HBASE-25571) | Compilation error in branch-2 after HBASE-25364 | Major | . |
| [HBASE-25512](https://issues.apache.org/jira/browse/HBASE-25512) | May throw StringIndexOutOfBoundsException when construct illegal tablename error | Trivial | . |
| [HBASE-25560](https://issues.apache.org/jira/browse/HBASE-25560) | Remove unused parameter named peerId in the constructor method of CatalogReplicationSourcePeer | Major | . |
| [HBASE-25543](https://issues.apache.org/jira/browse/HBASE-25543) | When configuration "hadoop.security.authorization" is set to false, the system will still try to authorize an RPC and raise AccessDeniedException | Minor | IPC/RPC |
| [HBASE-25554](https://issues.apache.org/jira/browse/HBASE-25554) | NPE when init RegionMover | Major | . |
| [HBASE-25523](https://issues.apache.org/jira/browse/HBASE-25523) | Region normalizer chore thread is getting killed | Major | Normalizer |
| [HBASE-25533](https://issues.apache.org/jira/browse/HBASE-25533) | The metadata of the table and family should not be an empty string | Major | . |
| [HBASE-25478](https://issues.apache.org/jira/browse/HBASE-25478) | Implement retries when enabling tables in TestRegionReplicaReplicationEndpoint | Minor | . |
| [HBASE-25497](https://issues.apache.org/jira/browse/HBASE-25497) | move\_namespaces\_rsgroup should change hbase.rsgroup.name config in NamespaceDescriptor | Major | . |
| [HBASE-25356](https://issues.apache.org/jira/browse/HBASE-25356) | HBaseAdmin#getRegion() needs to filter out non-regionName and non-encodedRegionName | Major | shell |
| [HBASE-25279](https://issues.apache.org/jira/browse/HBASE-25279) | Non-daemon thread in ZKWatcher | Critical | Zookeeper |
| [HBASE-25503](https://issues.apache.org/jira/browse/HBASE-25503) | HBase code download is failing on windows with invalid path error | Major | . |
| [HBASE-24813](https://issues.apache.org/jira/browse/HBASE-24813) | ReplicationSource should clear buffer usage on ReplicationSourceManager upon termination | Major | Replication |
| [HBASE-25459](https://issues.apache.org/jira/browse/HBASE-25459) | WAL can't be cleaned in some scenes | Major | . |
| [HBASE-25434](https://issues.apache.org/jira/browse/HBASE-25434) | SlowDelete & SlowPut metric value should use updateDelete & updatePut | Major | regionserver |
| [HBASE-25441](https://issues.apache.org/jira/browse/HBASE-25441) | add security check for some APIs in RSRpcServices | Critical | . |
| [HBASE-25432](https://issues.apache.org/jira/browse/HBASE-25432) | we should add security checks for setTableStateInMeta and fixMeta | Blocker | . |
| [HBASE-25445](https://issues.apache.org/jira/browse/HBASE-25445) | Old WALs archive fails in procedure based WAL split | Critical | wal |
| [HBASE-25287](https://issues.apache.org/jira/browse/HBASE-25287) | Forgetting to unbuffer streams results in many CLOSE\_WAIT sockets when loading files | Major | . |
| [HBASE-25447](https://issues.apache.org/jira/browse/HBASE-25447) | remoteProc is suspended due to OOM ERROR | Major | proc-v2 |
| [HBASE-24755](https://issues.apache.org/jira/browse/HBASE-24755) | [LOG][RSGroup]Error message is confusing while adding a offline RS to rsgroup | Major | rsgroup |
| [HBASE-25463](https://issues.apache.org/jira/browse/HBASE-25463) | Fix comment error | Minor | shell |
| [HBASE-25457](https://issues.apache.org/jira/browse/HBASE-25457) | Possible race in AsyncConnectionImpl between getChoreService and close | Major | Client |
| [HBASE-25456](https://issues.apache.org/jira/browse/HBASE-25456) | setRegionStateInMeta need security check | Critical | . |
| [HBASE-25383](https://issues.apache.org/jira/browse/HBASE-25383) | HBase doesn't update and remove the peer config from hbase.replication.source.custom.walentryfilters if the config is already set on the peer. | Major | . |
| [HBASE-25404](https://issues.apache.org/jira/browse/HBASE-25404) | Procedures table Id under master web UI gets word break to single character | Minor | UI |
| [HBASE-25277](https://issues.apache.org/jira/browse/HBASE-25277) | postScannerFilterRow impacts Scan performance a lot in HBase 2.x | Critical | Coprocessors, scan |
| [HBASE-25365](https://issues.apache.org/jira/browse/HBASE-25365) | The log in move\_servers\_rsgroup is incorrect | Minor | . |
| [HBASE-25372](https://issues.apache.org/jira/browse/HBASE-25372) | Fix typo in ban-jersey section of the enforcer plugin in pom.xml | Major | build |
| [HBASE-25361](https://issues.apache.org/jira/browse/HBASE-25361) | [Flakey Tests] branch-2 TestMetaRegionLocationCache.testStandByMetaLocations | Major | flakies |
| [HBASE-25292](https://issues.apache.org/jira/browse/HBASE-25292) | Improve InetSocketAddress usage discipline | Major | Client, HFile |
### TESTS:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-27161](https://issues.apache.org/jira/browse/HBASE-27161) | Improve TestMultiRespectsLimits | Minor | test |
| [HBASE-27051](https://issues.apache.org/jira/browse/HBASE-27051) | TestReplicationSource.testReplicationSourceInitializingMetric is flaky | Minor | test |
| [HBASE-27039](https://issues.apache.org/jira/browse/HBASE-27039) | Some methods of MasterRegion should be annotated for testing only | Minor | master |
| [HBASE-27054](https://issues.apache.org/jira/browse/HBASE-27054) | TestStochasticLoadBalancerRegionReplicaLargeCluster.testRegionReplicasOnLargeCluster is flaky | Major | test |
| [HBASE-27052](https://issues.apache.org/jira/browse/HBASE-27052) | TestAsyncTableScanner.testScanWrongColumnFamily is flaky | Major | test |
| [HBASE-27050](https://issues.apache.org/jira/browse/HBASE-27050) | Support unit test pattern matching again | Minor | test |
| [HBASE-26989](https://issues.apache.org/jira/browse/HBASE-26989) | TestStochasticLoadBalancer has some slow methods, and inconsistent set, reset, unset of configuration | Minor | Balancer, test |
| [HBASE-26689](https://issues.apache.org/jira/browse/HBASE-26689) | Backport HBASE-24443 Refactor TestCustomSaslAuthenticationProvider | Minor | test |
| [HBASE-26542](https://issues.apache.org/jira/browse/HBASE-26542) | Apply a \`package\` to test protobuf files | Minor | Protobufs, test |
| [HBASE-26349](https://issues.apache.org/jira/browse/HBASE-26349) | Improve recent change to IntegrationTestLoadCommonCrawl | Minor | integration tests, test |
| [HBASE-26335](https://issues.apache.org/jira/browse/HBASE-26335) | Minor improvements to IntegrationTestLoadCommonCrawl | Minor | integration tests, test |
| [HBASE-26272](https://issues.apache.org/jira/browse/HBASE-26272) | TestTableMapReduceUtil failure in branch-2 | Major | test |
| [HBASE-26185](https://issues.apache.org/jira/browse/HBASE-26185) | Fix TestMaster#testMoveRegionWhenNotInitialized with hbase.min.version.move.system.tables | Minor | . |
| [HBASE-25910](https://issues.apache.org/jira/browse/HBASE-25910) | Fix TestClusterPortAssignment.testClusterPortAssignment test and re-enable it. | Minor | flakies, test |
| [HBASE-25824](https://issues.apache.org/jira/browse/HBASE-25824) | IntegrationTestLoadCommonCrawl | Minor | integration tests |
| [HBASE-25561](https://issues.apache.org/jira/browse/HBASE-25561) | Added ignored test for async connection that runs retries just so can check how long it takes and that retrying is happening | Trivial | test |
| [HBASE-25334](https://issues.apache.org/jira/browse/HBASE-25334) | TestRSGroupsFallback.testFallback is flaky | Major | . |
| [HBASE-25370](https://issues.apache.org/jira/browse/HBASE-25370) | Fix flaky test TestClassFinder#testClassFinderDefaultsToOwnPackage | Major | test |
### SUB-TASKS:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-27206](https://issues.apache.org/jira/browse/HBASE-27206) | Clean up error-prone findings in hbase-common | Major | . |
| [HBASE-27234](https://issues.apache.org/jira/browse/HBASE-27234) | Clean up error-prone findings in hbase-examples | Major | . |
| [HBASE-27252](https://issues.apache.org/jira/browse/HBASE-27252) | Clean up error-prone findings in hbase-it | Major | . |
| [HBASE-26969](https://issues.apache.org/jira/browse/HBASE-26969) | Eliminate MOB renames when SFT is enabled | Major | mob |
| [HBASE-27301](https://issues.apache.org/jira/browse/HBASE-27301) | Add Delete addFamilyVersion timestamp verify | Minor | Client |
| [HBASE-27293](https://issues.apache.org/jira/browse/HBASE-27293) | Remove jenkins and personality scripts support for 1.x | Major | scripts |
| [HBASE-27201](https://issues.apache.org/jira/browse/HBASE-27201) | Clean up error-prone findings in hbase-backup | Major | . |
| [HBASE-27240](https://issues.apache.org/jira/browse/HBASE-27240) | Clean up error-prone findings in hbase-http | Major | . |
| [HBASE-27203](https://issues.apache.org/jira/browse/HBASE-27203) | Clean up error-prone findings in hbase-client | Major | . |
| [HBASE-27236](https://issues.apache.org/jira/browse/HBASE-27236) | Clean up error-prone findings in hbase-hbtop | Major | . |
| [HBASE-27210](https://issues.apache.org/jira/browse/HBASE-27210) | Clean up error-prone findings in hbase-endpoint | Major | . |
| [HBASE-27235](https://issues.apache.org/jira/browse/HBASE-27235) | Clean up error-prone findings in hbase-hadoop-compat | Major | . |
| [HBASE-27220](https://issues.apache.org/jira/browse/HBASE-27220) | Apply the spotless format change in HBASE-27208 to our code base | Major | . |
| [HBASE-27202](https://issues.apache.org/jira/browse/HBASE-27202) | Clean up error-prone findings in hbase-balancer | Major | . |
| [HBASE-27200](https://issues.apache.org/jira/browse/HBASE-27200) | Clean up error-prone findings in hbase-archetypes | Major | . |
| [HBASE-27194](https://issues.apache.org/jira/browse/HBASE-27194) | Add test coverage for SimpleRpcServer | Major | . |
| [HBASE-23330](https://issues.apache.org/jira/browse/HBASE-23330) | Expose cluster ID for clients using it for delegation token based auth | Major | Client, master |
| [HBASE-27166](https://issues.apache.org/jira/browse/HBASE-27166) | WAL value compression minor improvements | Minor | . |
| [HBASE-27111](https://issues.apache.org/jira/browse/HBASE-27111) | Make Netty channel bytebuf allocator configurable | Major | . |
| [HBASE-26167](https://issues.apache.org/jira/browse/HBASE-26167) | Allow users to not start zookeeper and dfs cluster when using TestingHBaseCluster | Major | test |
| [HBASE-26366](https://issues.apache.org/jira/browse/HBASE-26366) | Provide meaningful parent spans to ZK interactions | Major | tracing |
| [HBASE-26933](https://issues.apache.org/jira/browse/HBASE-26933) | Remove all ref guide stuff on branch other than master | Major | documentation |
| [HBASE-27006](https://issues.apache.org/jira/browse/HBASE-27006) | cordon off large ci worker nodes | Major | . |
| [HBASE-26855](https://issues.apache.org/jira/browse/HBASE-26855) | Delete unnecessary dependency on jaxb-runtime jar | Major | . |
| [HBASE-27024](https://issues.apache.org/jira/browse/HBASE-27024) | The User API and Developer API links are broken on hbase.apache.org | Major | website |
| [HBASE-27045](https://issues.apache.org/jira/browse/HBASE-27045) | Disable TestClusterScopeQuotaThrottle | Major | test |
| [HBASE-26986](https://issues.apache.org/jira/browse/HBASE-26986) | Trace a one-shot execution of a Master procedure | Major | . |
| [HBASE-26999](https://issues.apache.org/jira/browse/HBASE-26999) | HStore should try write WAL compaction marker before replacing compacted files in StoreEngine | Major | . |
| [HBASE-26330](https://issues.apache.org/jira/browse/HBASE-26330) | Document new provided compression codecs | Blocker | . |
| [HBASE-26995](https://issues.apache.org/jira/browse/HBASE-26995) | Remove ref guide check in pre commit and nightly for branches other than master | Major | build, scripts |
| [HBASE-26648](https://issues.apache.org/jira/browse/HBASE-26648) | Improve fidelity of RegionLocator spans | Major | tracing |
| [HBASE-26899](https://issues.apache.org/jira/browse/HBASE-26899) | Run spotless:apply | Major | . |
| [HBASE-26932](https://issues.apache.org/jira/browse/HBASE-26932) | Skip generating ref guide when running 'mvn site' on branch other than master | Major | build, pom |
| [HBASE-25058](https://issues.apache.org/jira/browse/HBASE-25058) | Export necessary modules when running under JDK11 | Major | Performance, rpc |
| [HBASE-26928](https://issues.apache.org/jira/browse/HBASE-26928) | Fix several indentation problems | Major | . |
| [HBASE-26922](https://issues.apache.org/jira/browse/HBASE-26922) | Fix LineLength warnings as much as possible if it can not be fixed by spotless | Major | . |
| [HBASE-26929](https://issues.apache.org/jira/browse/HBASE-26929) | Upgrade surefire plugin to 3.0.0-M6 | Major | pom, test |
| [HBASE-26927](https://issues.apache.org/jira/browse/HBASE-26927) | Add snapshot scanner UT with SFT and some cleanups to TestTableSnapshotScanner | Major | . |
| [HBASE-26916](https://issues.apache.org/jira/browse/HBASE-26916) | Fix missing braces warnings in DefaultVisibilityExpressionResolver | Major | . |
| [HBASE-26919](https://issues.apache.org/jira/browse/HBASE-26919) | Rewrite the counting rows part in TestFromClientSide4 | Major | test |
| [HBASE-26920](https://issues.apache.org/jira/browse/HBASE-26920) | Fix missing braces warnings in TestProcedureMember | Major | test |
| [HBASE-26921](https://issues.apache.org/jira/browse/HBASE-26921) | Rewrite the counting cells part in TestMultiVersions | Major | test |
| [HBASE-26545](https://issues.apache.org/jira/browse/HBASE-26545) | Implement tracing of scan | Major | tracing |
| [HBASE-26531](https://issues.apache.org/jira/browse/HBASE-26531) | Trace coprocessor exec endpoints | Major | . |
| [HBASE-25896](https://issues.apache.org/jira/browse/HBASE-25896) | Implement a Region Visualization on Master WebUI | Major | . |
| [HBASE-25895](https://issues.apache.org/jira/browse/HBASE-25895) | Implement a Cluster Metrics JSON endpoint | Major | . |
| [HBASE-26824](https://issues.apache.org/jira/browse/HBASE-26824) | TestHBaseTestingUtil.testResolvePortConflict failing after HBASE-26582 | Major | . |
| [HBASE-26582](https://issues.apache.org/jira/browse/HBASE-26582) | Prune use of Random and SecureRandom objects | Minor | . |
| [HBASE-26764](https://issues.apache.org/jira/browse/HBASE-26764) | Implement generic exception support for TraceUtil methods over Callables and Runnables | Major | . |
| [HBASE-26759](https://issues.apache.org/jira/browse/HBASE-26759) | Fix trace continuity through CallRunner | Major | . |
| [HBASE-26640](https://issues.apache.org/jira/browse/HBASE-26640) | Reimplement master local region initialization to better work with SFT | Major | master, RegionProcedureStore |
| [HBASE-26673](https://issues.apache.org/jira/browse/HBASE-26673) | Implement a shell command for change SFT implementation | Major | shell |
| [HBASE-26434](https://issues.apache.org/jira/browse/HBASE-26434) | Compact L0 files for cold regions using StripeCompactionPolicy | Major | . |
| [HBASE-26749](https://issues.apache.org/jira/browse/HBASE-26749) | Migrate HBase main pre commit job to ci-hbase | Major | . |
| [HBASE-26697](https://issues.apache.org/jira/browse/HBASE-26697) | Migrate HBase Nightly HBase-Flaky-Tests and HBase-Find-Flaky-Tests to ci-hbase | Major | jenkins |
| [HBASE-26521](https://issues.apache.org/jira/browse/HBASE-26521) | Name RPC spans as \`$package.$service/$method\` | Major | . |
| [HBASE-26747](https://issues.apache.org/jira/browse/HBASE-26747) | Use python2 instead of python in our python scripts | Major | jenkins |
| [HBASE-26472](https://issues.apache.org/jira/browse/HBASE-26472) | Adhere to semantic conventions regarding table data operations | Major | . |
| [HBASE-26473](https://issues.apache.org/jira/browse/HBASE-26473) | Introduce \`db.hbase.container\_operations\` span attribute | Major | . |
| [HBASE-26474](https://issues.apache.org/jira/browse/HBASE-26474) | Implement connection-level attributes | Major | . |
| [HBASE-26520](https://issues.apache.org/jira/browse/HBASE-26520) | Remove use of \`db.hbase.namespace\` tracing attribute | Major | . |
| [HBASE-26397](https://issues.apache.org/jira/browse/HBASE-26397) | Display the excluded datanodes on regionserver UI | Major | . |
| [HBASE-24870](https://issues.apache.org/jira/browse/HBASE-24870) | Ignore TestAsyncTableRSCrashPublish | Major | . |
| [HBASE-26304](https://issues.apache.org/jira/browse/HBASE-26304) | Reflect out-of-band locality improvements in served requests | Major | . |
| [HBASE-26471](https://issues.apache.org/jira/browse/HBASE-26471) | Move tracing semantic attributes to their own class | Major | . |
| [HBASE-26470](https://issues.apache.org/jira/browse/HBASE-26470) | Use openlabtesting protoc on linux arm64 in HBASE 2.x | Major | build |
| [HBASE-26327](https://issues.apache.org/jira/browse/HBASE-26327) | Replicas cohosted on a rack shouldn't keep triggering Balancer | Major | Balancer |
| [HBASE-26308](https://issues.apache.org/jira/browse/HBASE-26308) | Sum of multiplier of cost functions is not populated properly when we have a shortcut for trigger | Critical | Balancer |
| [HBASE-26430](https://issues.apache.org/jira/browse/HBASE-26430) | Increase DefaultHeapMemoryTuner log level | Minor | regionserver |
| [HBASE-26353](https://issues.apache.org/jira/browse/HBASE-26353) | Support loadable dictionaries in hbase-compression-zstd | Minor | . |
| [HBASE-26319](https://issues.apache.org/jira/browse/HBASE-26319) | Make flaky find job track more builds | Major | flakies, jenkins |
| [HBASE-26390](https://issues.apache.org/jira/browse/HBASE-26390) | Upload src tarball to nightlies for nightly jobs | Major | jenkins, scripts |
| [HBASE-26382](https://issues.apache.org/jira/browse/HBASE-26382) | Use gen\_redirect\_html for linking flaky test logs | Major | jenkins, scripts, test |
| [HBASE-26362](https://issues.apache.org/jira/browse/HBASE-26362) | Upload mvn site artifacts for nightly build to nightlies | Major | jenkins, scripts |
| [HBASE-26316](https://issues.apache.org/jira/browse/HBASE-26316) | Per-table or per-CF compression codec setting overrides | Minor | HFile, Operability |
| [HBASE-26360](https://issues.apache.org/jira/browse/HBASE-26360) | Use gen\_redirect\_html for linking test logs | Major | jenkins, scripts |
| [HBASE-26341](https://issues.apache.org/jira/browse/HBASE-26341) | Upload dashboard html for flaky find job to nightlies | Major | flakies, jenkins, scripts |
| [HBASE-24833](https://issues.apache.org/jira/browse/HBASE-24833) | Bootstrap should not delete the META table directory if it's not partial | Major | . |
| [HBASE-26339](https://issues.apache.org/jira/browse/HBASE-26339) | SshPublisher will skip uploading artifacts if the build is failure | Major | jenkins, scripts |
| [HBASE-26324](https://issues.apache.org/jira/browse/HBASE-26324) | Reuse compressors and decompressors in WAL CompressionContext | Minor | wal |
| [HBASE-26317](https://issues.apache.org/jira/browse/HBASE-26317) | Publish the test logs for pre commit jenkins job to nightlies | Major | jenkins, scripts |
| [HBASE-26313](https://issues.apache.org/jira/browse/HBASE-26313) | Publish the test logs for our nightly jobs to nightlies.apache.org | Major | jenkins, scripts |
| [HBASE-26318](https://issues.apache.org/jira/browse/HBASE-26318) | Publish test logs for flaky jobs to nightlies | Major | flakies, jenkins |
| [HBASE-26259](https://issues.apache.org/jira/browse/HBASE-26259) | Fallback support to pure Java compression | Major | Performance |
| [HBASE-26294](https://issues.apache.org/jira/browse/HBASE-26294) | Backport "HBASE-26181 Region server and master could use itself as ConnectionRegistry" to branch-2 | Major | master, regionserver |
| [HBASE-26293](https://issues.apache.org/jira/browse/HBASE-26293) | Use reservoir sampling when selecting bootstrap nodes | Major | master, regionserver |
| [HBASE-26277](https://issues.apache.org/jira/browse/HBASE-26277) | Revert 26240, Apply InterfaceAudience.Private to BalanceResponse$Builder | Minor | . |
| [HBASE-26240](https://issues.apache.org/jira/browse/HBASE-26240) | Set BalanceRequest$Builder to InterfaceAudience.Private | Trivial | . |
| [HBASE-26157](https://issues.apache.org/jira/browse/HBASE-26157) | Expose some IA.LimitedPrivate interface in TestingHBaseCluster | Major | API, test |
| [HBASE-26235](https://issues.apache.org/jira/browse/HBASE-26235) | We could start RegionServerTracker before becoming active master | Major | master, Zookeeper |
| [HBASE-26216](https://issues.apache.org/jira/browse/HBASE-26216) | Move HRegionServer.abort(String) to Abortable as a default method | Major | API, regionserver |
| [HBASE-26189](https://issues.apache.org/jira/browse/HBASE-26189) | Reduce log level of CompactionProgress notice to DEBUG | Minor | Compaction |
| [HBASE-26168](https://issues.apache.org/jira/browse/HBASE-26168) | Backport HBASE-25811 for fixing nightly tests with error of \`NoClassDefFoundError: io/opentelemetry/api/GlobalOpenTelemetry\` | Major | tracing |
| [HBASE-26227](https://issues.apache.org/jira/browse/HBASE-26227) | Forward port HBASE-26223 test code to branch-2.4+ | Major | test |
| [HBASE-26140](https://issues.apache.org/jira/browse/HBASE-26140) | Backport HBASE-25778 "The tracinig implementation for AsyncConnectionImpl.getHbck is incorrect" to branch-2 | Major | tracing |
| [HBASE-26139](https://issues.apache.org/jira/browse/HBASE-26139) | Backport HBASE-23762 "Add documentation on how to enable and view tracing with OpenTelemetry" to branch-2 | Major | tracing |
| [HBASE-26138](https://issues.apache.org/jira/browse/HBASE-26138) | Backport HBASE-25733 "Upgrade opentelemetry to 1.0.1" to branch-2 | Major | tracing |
| [HBASE-26137](https://issues.apache.org/jira/browse/HBASE-26137) | Backport HBASE-25732 "Change the command line argument for tracing after upgrading opentelemtry to 1.0.0" to branch-2 | Major | tracing |
| [HBASE-26180](https://issues.apache.org/jira/browse/HBASE-26180) | Introduce a initial refresh interval for RpcConnectionRegistry | Major | Client |
| [HBASE-26215](https://issues.apache.org/jira/browse/HBASE-26215) | The backup master status page should use ActiveMasterManager instead of MasterAddressTracker | Major | master, UI |
| [HBASE-26136](https://issues.apache.org/jira/browse/HBASE-26136) | Backport HBASE-25723 "Temporarily remove the trace support for RegionScanner.next" to branch-2 | Major | tracing |
| [HBASE-26135](https://issues.apache.org/jira/browse/HBASE-26135) | Backport HBASE-25616 "Upgrade opentelemetry to 1.0.0" to branch-2 | Major | tracing |
| [HBASE-26173](https://issues.apache.org/jira/browse/HBASE-26173) | Return only a sub set of region servers as bootstrap nodes | Major | Client |
| [HBASE-26182](https://issues.apache.org/jira/browse/HBASE-26182) | Allow disabling refresh of connection registry endpoint | Major | Client |
| [HBASE-26134](https://issues.apache.org/jira/browse/HBASE-26134) | Backport HBASE-25617 "Revisit the span names" to branch-2 | Major | . |
| [HBASE-26133](https://issues.apache.org/jira/browse/HBASE-26133) | Backport HBASE-25591 "Upgrade opentelemetry to 0.17.1" to branch-2 | Major | . |
| [HBASE-26132](https://issues.apache.org/jira/browse/HBASE-26132) | Backport HBASE-25535 "Set span kind to CLIENT in AbstractRpcClient" to branch-2 | Major | . |
| [HBASE-26131](https://issues.apache.org/jira/browse/HBASE-26131) | Backport HBASE-25484 "Add trace support for WAL sync" to branch-2 | Major | . |
| [HBASE-26172](https://issues.apache.org/jira/browse/HBASE-26172) | Deprecate MasterRegistry | Major | Client |
| [HBASE-24337](https://issues.apache.org/jira/browse/HBASE-24337) | Backport HBASE-23968 to branch-2 | Minor | . |
| [HBASE-26130](https://issues.apache.org/jira/browse/HBASE-26130) | Backport HBASE-25455 "Add trace support for HRegion read/write operation" to branch-2 | Major | . |
| [HBASE-26129](https://issues.apache.org/jira/browse/HBASE-26129) | Backport HBASE-25481 "Add host and port attribute when tracing rpc call at client side" to branch-2 | Major | . |
| [HBASE-26128](https://issues.apache.org/jira/browse/HBASE-26128) | Backport HBASE-25454 "Add trace support for connection registry" to branch-2 | Major | tracing |
| [HBASE-26150](https://issues.apache.org/jira/browse/HBASE-26150) | Let region server also carry ClientMetaService | Major | Client, meta |
| [HBASE-26127](https://issues.apache.org/jira/browse/HBASE-26127) | Backport HBASE-23898 "Add trace support for simple apis in async client" to branch-2 | Major | tracing |
| [HBASE-26126](https://issues.apache.org/jira/browse/HBASE-26126) | Backport HBASE-25424 "Find a way to config OpenTelemetry tracing without directly depending on opentelemetry-sdk" to branch-2 | Major | . |
| [HBASE-26125](https://issues.apache.org/jira/browse/HBASE-26125) | Backport HBASE-25401 "Add trace support for async call in rpc client" to branch-2 | Major | tracing |
| [HBASE-26151](https://issues.apache.org/jira/browse/HBASE-26151) | Reimplement MasterAddressTracker to also cache backup master addresses | Major | Client, Zookeeper |
| [HBASE-26098](https://issues.apache.org/jira/browse/HBASE-26098) | Support passing a customized Configuration object when creating TestingHBaseCluster | Major | API, test |
| [HBASE-26124](https://issues.apache.org/jira/browse/HBASE-26124) | Backport HBASE-25373 "Remove HTrace completely in code base and try to make use of OpenTelemetry" to branch-2 | Major | tracing |
| [HBASE-26093](https://issues.apache.org/jira/browse/HBASE-26093) | Replication is stuck due to zero length wal file in oldWALs directory [master/branch-2] | Major | . |
| [HBASE-24734](https://issues.apache.org/jira/browse/HBASE-24734) | RegionInfo#containsRange should support check meta table | Major | HFile, MTTR |
| [HBASE-25739](https://issues.apache.org/jira/browse/HBASE-25739) | TableSkewCostFunction need to use aggregated deviation | Major | Balancer, master |
| [HBASE-26080](https://issues.apache.org/jira/browse/HBASE-26080) | Implement a new mini cluster class for end users | Major | API, test |
| [HBASE-26050](https://issues.apache.org/jira/browse/HBASE-26050) | Remove the reflection used in FSUtils.isInSafeMode | Major | . |
| [HBASE-26041](https://issues.apache.org/jira/browse/HBASE-26041) | Replace PrintThreadInfoHelper with HBase's own ReflectionUtils.printThreadInfo() | Major | util |
| [HBASE-26019](https://issues.apache.org/jira/browse/HBASE-26019) | Remove reflections used in HBaseConfiguration.getPassword() | Major | . |
| [HBASE-25992](https://issues.apache.org/jira/browse/HBASE-25992) | Polish the ReplicationSourceWALReader code for 2.x after HBASE-25596 | Major | Replication |
| [HBASE-25976](https://issues.apache.org/jira/browse/HBASE-25976) | Implement a master based ReplicationTracker | Major | Replication |
| [HBASE-25989](https://issues.apache.org/jira/browse/HBASE-25989) | FanOutOneBlockAsyncDFSOutput using shaded protobuf in hdfs 3.3+ | Major | . |
| [HBASE-25969](https://issues.apache.org/jira/browse/HBASE-25969) | Cleanup netty-all transitive includes | Major | . |
| [HBASE-25963](https://issues.apache.org/jira/browse/HBASE-25963) | HBaseCluster should be marked as IA.Public | Major | API |
| [HBASE-25911](https://issues.apache.org/jira/browse/HBASE-25911) | Fix uses of System.currentTimeMillis (should be EnvironmentEdgeManager.currentTime) | Minor | . |
| [HBASE-25941](https://issues.apache.org/jira/browse/HBASE-25941) | TestRESTServerSSL fails because of jdk bug | Major | test |
| [HBASE-25940](https://issues.apache.org/jira/browse/HBASE-25940) | Update Compression/TestCompressionTest: LZ4, SNAPPY, LZO | Major | . |
| [HBASE-25718](https://issues.apache.org/jira/browse/HBASE-25718) | Backport HBASE-25705 to branch-2 | Minor | rsgroup |
| [HBASE-25926](https://issues.apache.org/jira/browse/HBASE-25926) | Cleanup MetaTableAccessor references in FavoredNodeBalancer related code | Major | Balancer, FavoredNodes, meta |
| [HBASE-25791](https://issues.apache.org/jira/browse/HBASE-25791) | UI of master-status to show a recent history of that why balancer was rejected to run | Major | Balancer, master, UI |
| [HBASE-25894](https://issues.apache.org/jira/browse/HBASE-25894) | Improve the performance for region load and region count related cost functions | Major | Balancer, Performance |
| [HBASE-25873](https://issues.apache.org/jira/browse/HBASE-25873) | Refactor and cleanup the code for CostFunction | Major | Balancer, Performance |
| [HBASE-25872](https://issues.apache.org/jira/browse/HBASE-25872) | Add documentation for LoadBalancer about synchronization | Major | Balancer, documentation |
| [HBASE-25883](https://issues.apache.org/jira/browse/HBASE-25883) | The regionFinder and rackManager fields in BaseLoadBalancer should be volatile | Major | Balancer |
| [HBASE-25852](https://issues.apache.org/jira/browse/HBASE-25852) | Move all the intialization work of LoadBalancer implementation to initialize method | Major | Balancer |
| [HBASE-25876](https://issues.apache.org/jira/browse/HBASE-25876) | Add retry if we fail to read all bytes of the protobuf magic marker | Trivial | io |
| [HBASE-25790](https://issues.apache.org/jira/browse/HBASE-25790) | NamedQueue 'BalancerRejection' for recent history of balancer skipping | Major | Balancer, master |
| [HBASE-25854](https://issues.apache.org/jira/browse/HBASE-25854) | Remove redundant AM in-memory state changes in CatalogJanitor | Major | . |
| [HBASE-25851](https://issues.apache.org/jira/browse/HBASE-25851) | Make LoadBalancer not extend Configurable interface | Major | Balancer |
| [HBASE-25847](https://issues.apache.org/jira/browse/HBASE-25847) | More DEBUG and TRACE level logging in CatalogJanitor and HbckChore | Minor | . |
| [HBASE-25834](https://issues.apache.org/jira/browse/HBASE-25834) | Remove balanceTable method from LoadBalancer interface | Major | Balancer |
| [HBASE-25838](https://issues.apache.org/jira/browse/HBASE-25838) | Use double instead of Double in StochasticLoadBalancer | Major | Balancer, Performance |
| [HBASE-25835](https://issues.apache.org/jira/browse/HBASE-25835) | Ignore duplicate split requests from regionserver reports | Major | . |
| [HBASE-25836](https://issues.apache.org/jira/browse/HBASE-25836) | RegionStates#getAssignmentsForBalancer should only care about OPEN or OPENING regions | Major | . |
| [HBASE-25840](https://issues.apache.org/jira/browse/HBASE-25840) | CatalogJanitor warns about skipping gc of regions during RIT, but does not actually skip | Minor | . |
| [HBASE-25819](https://issues.apache.org/jira/browse/HBASE-25819) | Fix style issues for StochasticLoadBalancer | Major | Balancer |
| [HBASE-25802](https://issues.apache.org/jira/browse/HBASE-25802) | Miscellaneous style improvements for load balancer related classes | Major | Balancer |
| [HBASE-25793](https://issues.apache.org/jira/browse/HBASE-25793) | Move BaseLoadBalancer.Cluster to a separated file | Major | Balancer |
| [HBASE-25775](https://issues.apache.org/jira/browse/HBASE-25775) | Use a special balancer to deal with maintenance mode | Major | Balancer |
| [HBASE-25687](https://issues.apache.org/jira/browse/HBASE-25687) | Backport "HBASE-25681 Add a switch for server/table queryMeter" to branch-2 and branch-1 | Major | . |
| [HBASE-25199](https://issues.apache.org/jira/browse/HBASE-25199) | Remove HStore#getStoreHomedir | Minor | . |
| [HBASE-25696](https://issues.apache.org/jira/browse/HBASE-25696) | Need to initialize SLF4JBridgeHandler in jul-to-slf4j for redirecting jul to slf4j | Major | logging |
| [HBASE-25695](https://issues.apache.org/jira/browse/HBASE-25695) | Link to the filter on hbase:meta from user tables panel on master page | Major | UI |
| [HBASE-25629](https://issues.apache.org/jira/browse/HBASE-25629) | Reimplement TestCurrentHourProvider to not depend on unstable TZs | Major | test |
| [HBASE-25671](https://issues.apache.org/jira/browse/HBASE-25671) | Backport HBASE-25608 to branch-2 | Major | . |
| [HBASE-25677](https://issues.apache.org/jira/browse/HBASE-25677) | Server+table counters on each scan #nextRaw invocation becomes a bottleneck when heavy load | Major | metrics |
| [HBASE-25667](https://issues.apache.org/jira/browse/HBASE-25667) | Remove RSGroup test addition made in parent; depends on functionality not in old branches | Major | . |
| [HBASE-25550](https://issues.apache.org/jira/browse/HBASE-25550) | More readable Competition Time | Minor | UI |
| [HBASE-24900](https://issues.apache.org/jira/browse/HBASE-24900) | Make retain assignment configurable during SCP | Major | amv2 |
| [HBASE-25509](https://issues.apache.org/jira/browse/HBASE-25509) | ChoreService.cancelChore will not call ScheduledChore.cleanup which may lead to resource leak | Major | util |
| [HBASE-25336](https://issues.apache.org/jira/browse/HBASE-25336) | Use Address instead of InetSocketAddress in RpcClient implementation | Major | Client, rpc |
| [HBASE-25353](https://issues.apache.org/jira/browse/HBASE-25353) | [Flakey Tests] branch-2 TestShutdownBackupMaster | Major | flakies |
### OTHER:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-13126](https://issues.apache.org/jira/browse/HBASE-13126) | Provide alternate mini cluster classes other than HBTU for downstream users to write unit tests | Critical | API, test |
| [HBASE-26245](https://issues.apache.org/jira/browse/HBASE-26245) | Store region server list in master local region | Major | master, Zookeeper |
| [HBASE-25934](https://issues.apache.org/jira/browse/HBASE-25934) | Add username for RegionScannerHolder | Minor | . |
| [HBASE-25826](https://issues.apache.org/jira/browse/HBASE-25826) | Revisit the synchronization of balancer implementation | Major | Balancer |
| [HBASE-26882](https://issues.apache.org/jira/browse/HBASE-26882) | Backport "HBASE-26810 Add dynamic configuration support for system coprocessors" to branch-2 | Major | Coprocessors, master, regionserver |
| [HBASE-27294](https://issues.apache.org/jira/browse/HBASE-27294) | Add new hadoop releases in our hadoop checks | Major | scripts |
| [HBASE-27299](https://issues.apache.org/jira/browse/HBASE-27299) | Bump minimum hadoop 2 version to 2.10.2 | Major | hadoop2, security |
| [HBASE-27221](https://issues.apache.org/jira/browse/HBASE-27221) | Bump spotless version to 2.24.1 | Major | build, pom |
| [HBASE-27281](https://issues.apache.org/jira/browse/HBASE-27281) | Add default implementation for Connection$getClusterId | Critical | Client |
| [HBASE-27248](https://issues.apache.org/jira/browse/HBASE-27248) | WALPrettyPrinter add print timestamp | Minor | tooling, wal |
| [HBASE-27182](https://issues.apache.org/jira/browse/HBASE-27182) | Rework tracing configuration | Major | scripts |
| [HBASE-27148](https://issues.apache.org/jira/browse/HBASE-27148) | Move minimum hadoop 3 support version to 3.2.3 | Major | dependencies, hadoop3, security |
| [HBASE-27175](https://issues.apache.org/jira/browse/HBASE-27175) | Failure to cleanup WAL split dir log should be at INFO level | Minor | . |
| [HBASE-27172](https://issues.apache.org/jira/browse/HBASE-27172) | Upgrade OpenTelemetry dependency to 1.15.0 | Major | build |
| [HBASE-27141](https://issues.apache.org/jira/browse/HBASE-27141) | Upgrade hbase-thirdparty dependency to 4.1.1 | Critical | dependencies, security, thirdparty |
| [HBASE-27108](https://issues.apache.org/jira/browse/HBASE-27108) | Revert HBASE-25709 | Blocker | . |
| [HBASE-27102](https://issues.apache.org/jira/browse/HBASE-27102) | Vacate the .idea folder in order to simplify spotless configuration | Major | build |
| [HBASE-27023](https://issues.apache.org/jira/browse/HBASE-27023) | Add protobuf to NOTICE file | Major | . |
| [HBASE-27082](https://issues.apache.org/jira/browse/HBASE-27082) | Change the return value of RSGroupInfo.getServers from SortedSet to Set to keep compatibility | Blocker | rsgroup |
| [HBASE-26912](https://issues.apache.org/jira/browse/HBASE-26912) | Bump checkstyle from 8.28 to 8.29 | Minor | test |
| [HBASE-26523](https://issues.apache.org/jira/browse/HBASE-26523) | Upgrade hbase-thirdparty dependency to 4.0.1 | Blocker | thirdparty |
| [HBASE-26892](https://issues.apache.org/jira/browse/HBASE-26892) | Add spotless:check in our pre commit general check | Major | jenkins |
| [HBASE-26906](https://issues.apache.org/jira/browse/HBASE-26906) | Remove duplicate dependency declaration | Major | build |
| [HBASE-26903](https://issues.apache.org/jira/browse/HBASE-26903) | Bump httpclient from 4.5.3 to 4.5.13 | Minor | . |
| [HBASE-26902](https://issues.apache.org/jira/browse/HBASE-26902) | Bump bcprov-jdk15on from 1.60 to 1.67 | Minor | . |
| [HBASE-26834](https://issues.apache.org/jira/browse/HBASE-26834) | Adapt ConnectionRule for both sync and async connections | Major | test |
| [HBASE-26861](https://issues.apache.org/jira/browse/HBASE-26861) | Fix flaky TestSnapshotFromMaster.testSnapshotHFileArchiving | Major | snapshots, test |
| [HBASE-26802](https://issues.apache.org/jira/browse/HBASE-26802) | Backport the log4j2 changes to branch-2 | Blocker | logging |
| [HBASE-26819](https://issues.apache.org/jira/browse/HBASE-26819) | Minor code cleanup in and around RpcScheduler | Minor | IPC/RPC |
| [HBASE-26817](https://issues.apache.org/jira/browse/HBASE-26817) | Mark RpcExecutor as IA.LimitedPrivate COPROC and PHOENIX | Major | compatibility |
| [HBASE-26782](https://issues.apache.org/jira/browse/HBASE-26782) | Minor code cleanup in and around RpcExecutor | Minor | IPC/RPC |
| [HBASE-26760](https://issues.apache.org/jira/browse/HBASE-26760) | LICENSE handling should not allow non-aggregated "apache-2.0" | Minor | community |
| [HBASE-26691](https://issues.apache.org/jira/browse/HBASE-26691) | Replacing log4j with reload4j for branch-2.x | Critical | logging |
| [HBASE-26788](https://issues.apache.org/jira/browse/HBASE-26788) | Disable Checks API callback from test results in PRs | Major | build |
| [HBASE-26622](https://issues.apache.org/jira/browse/HBASE-26622) | Update to error-prone 2.10 | Major | . |
| [HBASE-26663](https://issues.apache.org/jira/browse/HBASE-26663) | Upgrade Maven Enforcer Plugin | Major | build |
| [HBASE-25918](https://issues.apache.org/jira/browse/HBASE-25918) | Upgrade hbase-thirdparty dependency to 3.5.1 | Critical | dependencies |
| [HBASE-26719](https://issues.apache.org/jira/browse/HBASE-26719) | Remove 'patch' file added as part of commit for HBASE-25973 | Minor | . |
| [HBASE-26614](https://issues.apache.org/jira/browse/HBASE-26614) | Refactor code related to "dump"ing ZK nodes | Major | Zookeeper |
| [HBASE-26551](https://issues.apache.org/jira/browse/HBASE-26551) | Add FastPath feature to HBase RWQueueRpcExecutor | Major | rpc, Scheduler |
| [HBASE-26616](https://issues.apache.org/jira/browse/HBASE-26616) | Refactor code related to ZooKeeper authentication | Major | Zookeeper |
| [HBASE-26631](https://issues.apache.org/jira/browse/HBASE-26631) | Upgrade junit to 4.13.2 | Major | security, test |
| [HBASE-26564](https://issues.apache.org/jira/browse/HBASE-26564) | Retire the method visitLogEntryBeforeWrite without RegionInfo in WALActionListner | Minor | wal |
| [HBASE-26566](https://issues.apache.org/jira/browse/HBASE-26566) | Optimize encodeNumeric in OrderedBytes | Major | Performance |
| [HBASE-26580](https://issues.apache.org/jira/browse/HBASE-26580) | The message of StoreTooBusy is confused | Trivial | logging, regionserver |
| [HBASE-26549](https://issues.apache.org/jira/browse/HBASE-26549) | hbaseprotoc plugin should initialize maven | Major | jenkins |
| [HBASE-26490](https://issues.apache.org/jira/browse/HBASE-26490) | Add builder for class ReplicationLoadSink | Minor | Client |
| [HBASE-26444](https://issues.apache.org/jira/browse/HBASE-26444) | BucketCacheWriter should log only the BucketAllocatorException message, not the full stack trace | Major | logging, Operability |
| [HBASE-26443](https://issues.apache.org/jira/browse/HBASE-26443) | Some BaseLoadBalancer log lines should be at DEBUG level | Major | logging, Operability |
| [HBASE-26369](https://issues.apache.org/jira/browse/HBASE-26369) | Fix checkstyle issues for HBase-common: KeyValue and ByteBufferUtils | Trivial | . |
| [HBASE-26368](https://issues.apache.org/jira/browse/HBASE-26368) | Fix checkstyle issues for HRegionserver | Trivial | . |
| [HBASE-26329](https://issues.apache.org/jira/browse/HBASE-26329) | Upgrade commons-io to 2.11.0 | Major | dependencies |
| [HBASE-26186](https://issues.apache.org/jira/browse/HBASE-26186) | jenkins script for caching artifacts should verify cached file before relying on it | Major | build, integration tests |
| [HBASE-26288](https://issues.apache.org/jira/browse/HBASE-26288) | Revisit the usage of MetaTableLocator when HRegionServer.TEST\_SKIP\_REPORTING\_TRANSITION is true | Major | meta, regionserver, test, Zookeeper |
| [HBASE-26285](https://issues.apache.org/jira/browse/HBASE-26285) | Remove MetaTableLocator usages in non-migration code | Major | meta, Zookeeper |
| [HBASE-25853](https://issues.apache.org/jira/browse/HBASE-25853) | Backport HBASE-22120 (Replace HTrace with OpenTelemetry) to branch-2 | Major | tracing |
| [HBASE-26152](https://issues.apache.org/jira/browse/HBASE-26152) | Exclude javax.servlet:servlet-api in hbase-shaded-testing-util | Major | . |
| [HBASE-25521](https://issues.apache.org/jira/browse/HBASE-25521) | Change ChoreService and ScheduledChore to IA.Private | Major | util |
| [HBASE-26015](https://issues.apache.org/jira/browse/HBASE-26015) | Should implement getRegionServers(boolean) method in AsyncAdmin | Major | Admin, Client |
| [HBASE-25920](https://issues.apache.org/jira/browse/HBASE-25920) | Support Hadoop 3.3.1 | Major | . |
| [HBASE-25948](https://issues.apache.org/jira/browse/HBASE-25948) | Remove deprecated ZK command 'rmr' in hbase-cleanup.sh | Major | scripts |
| [HBASE-25884](https://issues.apache.org/jira/browse/HBASE-25884) | NPE while getting Balancer decisions | Major | . |
| [HBASE-25843](https://issues.apache.org/jira/browse/HBASE-25843) | Move master http-related code into o.a.h.h.master.http | Minor | master |
| [HBASE-25842](https://issues.apache.org/jira/browse/HBASE-25842) | Move regionserver http-related code into o.a.h.h.regionserver.http | Minor | regionserver |
| [HBASE-25779](https://issues.apache.org/jira/browse/HBASE-25779) | HRegionServer#compactSplitThread should be private | Trivial | regionserver |
| [HBASE-25755](https://issues.apache.org/jira/browse/HBASE-25755) | Exclude tomcat-embed-core from libthrift | Critical | dependencies, Thrift |
| [HBASE-25750](https://issues.apache.org/jira/browse/HBASE-25750) | Upgrade RpcControllerFactory and HBaseRpcController from Private to LimitedPrivate(COPROC,PHOENIX) | Major | Coprocessors, phoenix, rpc |
| [HBASE-25604](https://issues.apache.org/jira/browse/HBASE-25604) | Upgrade spotbugs to 4.x | Major | build, findbugs |
| [HBASE-25620](https://issues.apache.org/jira/browse/HBASE-25620) | Increase timeout value for pre commit | Major | build, test |
| [HBASE-25615](https://issues.apache.org/jira/browse/HBASE-25615) | Upgrade java version in pre commit docker file | Major | build |
| [HBASE-25083](https://issues.apache.org/jira/browse/HBASE-25083) | make sure the next hbase 1.y release has Hadoop 2.10 as a minimum version | Major | documentation, hadoop2 |
| [HBASE-25474](https://issues.apache.org/jira/browse/HBASE-25474) | Update HBase version to 2.5.0 in branch-2 pom.xml | Major | . |
| [HBASE-25333](https://issues.apache.org/jira/browse/HBASE-25333) | Add maven enforcer rule to ban VisibleForTesting imports | Major | build, pom |
| [HBASE-25451](https://issues.apache.org/jira/browse/HBASE-25451) | Upgrade commons-io to 2.8.0 | Major | dependencies |
| [HBASE-25452](https://issues.apache.org/jira/browse/HBASE-25452) | Use MatcherAssert.assertThat instead of org.junit.Assert.assertThat | Major | test |
| [HBASE-25400](https://issues.apache.org/jira/browse/HBASE-25400) | [Flakey Tests] branch-2 TestRegionMoveAndAbandon | Major | . |
| [HBASE-25389](https://issues.apache.org/jira/browse/HBASE-25389) | [Flakey Tests] branch-2 TestMetaShutdownHandler | Major | flakies |
## Release 2.2.0 - Unreleased (as of 2019-06-11)
### INCOMPATIBLE CHANGES:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-21991](https://issues.apache.org/jira/browse/HBASE-21991) | Fix MetaMetrics issues - [Race condition, Faulty remove logic], few improvements | Major | Coprocessors, metrics |
| [HBASE-22399](https://issues.apache.org/jira/browse/HBASE-22399) | Change default hadoop-two.version to 2.8.x and remove the 2.7.x hadoop checks | Major | build, hadoop2 |
| [HBASE-21082](https://issues.apache.org/jira/browse/HBASE-21082) | Reimplement assign/unassign related procedure metrics | Critical | amv2, metrics |
| [HBASE-20587](https://issues.apache.org/jira/browse/HBASE-20587) | Replace Jackson with shaded thirdparty gson | Major | dependencies |
| [HBASE-21727](https://issues.apache.org/jira/browse/HBASE-21727) | Simplify documentation around client timeout | Minor | . |
| [HBASE-21684](https://issues.apache.org/jira/browse/HBASE-21684) | Throw DNRIOE when connection or rpc client is closed | Major | asyncclient, Client |
| [HBASE-21792](https://issues.apache.org/jira/browse/HBASE-21792) | Mark HTableMultiplexer as deprecated and remove it in 3.0.0 | Major | Client |
| [HBASE-21657](https://issues.apache.org/jira/browse/HBASE-21657) | PrivateCellUtil#estimatedSerializedSizeOf has been the bottleneck in 100% scan case. | Major | Performance |
| [HBASE-21560](https://issues.apache.org/jira/browse/HBASE-21560) | Return a new TableDescriptor for MasterObserver#preModifyTable to allow coprocessor modify the TableDescriptor | Major | Coprocessors |
| [HBASE-21492](https://issues.apache.org/jira/browse/HBASE-21492) | CellCodec Written To WAL Before It's Verified | Critical | wal |
| [HBASE-21452](https://issues.apache.org/jira/browse/HBASE-21452) | Illegal character in hbase counters group name | Major | spark |
| [HBASE-21158](https://issues.apache.org/jira/browse/HBASE-21158) | Empty qualifier cell should not be returned if it does not match QualifierFilter | Critical | Filters |
| [HBASE-21223](https://issues.apache.org/jira/browse/HBASE-21223) | [amv2] Remove abort\_procedure from shell | Critical | amv2, hbck2, shell |
| [HBASE-20881](https://issues.apache.org/jira/browse/HBASE-20881) | Introduce a region transition procedure to handle all the state transition for a region | Major | amv2, proc-v2 |
| [HBASE-20884](https://issues.apache.org/jira/browse/HBASE-20884) | Replace usage of our Base64 implementation with java.util.Base64 | Major | . |
### NEW FEATURES:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-22148](https://issues.apache.org/jira/browse/HBASE-22148) | Provide an alternative to CellUtil.setTimestamp | Blocker | API, Coprocessors |
| [HBASE-21815](https://issues.apache.org/jira/browse/HBASE-21815) | Make isTrackingMetrics and getMetrics of ScannerContext public | Minor | . |
| [HBASE-21926](https://issues.apache.org/jira/browse/HBASE-21926) | Profiler servlet | Major | master, Operability, regionserver |
| [HBASE-20886](https://issues.apache.org/jira/browse/HBASE-20886) | [Auth] Support keytab login in hbase client | Critical | asyncclient, Client, security |
| [HBASE-17942](https://issues.apache.org/jira/browse/HBASE-17942) | Disable region splits and merges per table | Major | . |
| [HBASE-21753](https://issues.apache.org/jira/browse/HBASE-21753) | Support getting the locations for all the replicas of a region | Major | Client |
| [HBASE-20636](https://issues.apache.org/jira/browse/HBASE-20636) | Introduce two bloom filter type : ROWPREFIX\_FIXED\_LENGTH and ROWPREFIX\_DELIMITED | Major | HFile, regionserver, Scanners |
| [HBASE-20649](https://issues.apache.org/jira/browse/HBASE-20649) | Validate HFiles do not have PREFIX\_TREE DataBlockEncoding | Minor | Operability, tooling |
### IMPROVEMENTS:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-22284](https://issues.apache.org/jira/browse/HBASE-22284) | optimization StringBuilder.append of AbstractMemStore.toString | Trivial | . |
| [HBASE-22523](https://issues.apache.org/jira/browse/HBASE-22523) | Refactor RegionStates#getAssignmentsByTable to make it easy to understand | Major | . |
| [HBASE-22511](https://issues.apache.org/jira/browse/HBASE-22511) | More missing /rs-status links | Minor | UI |
| [HBASE-22496](https://issues.apache.org/jira/browse/HBASE-22496) | UnsafeAccess.unsafeCopy should not copy more than UNSAFE\_COPY\_THRESHOLD on each iteration | Major | . |
| [HBASE-22488](https://issues.apache.org/jira/browse/HBASE-22488) | Cleanup the explicit timeout value for test methods | Major | . |
| [HBASE-22411](https://issues.apache.org/jira/browse/HBASE-22411) | Refactor codes of moving reigons in RSGroup | Major | rsgroup |
| [HBASE-22467](https://issues.apache.org/jira/browse/HBASE-22467) | WebUI changes to enable Apache Knox UI proxying | Major | UI |
| [HBASE-22474](https://issues.apache.org/jira/browse/HBASE-22474) | Add --mvn-custom-repo parameter to yetus calls | Minor | . |
| [HBASE-20305](https://issues.apache.org/jira/browse/HBASE-20305) | Add option to SyncTable that skip deletes on target cluster | Minor | mapreduce |
| [HBASE-21784](https://issues.apache.org/jira/browse/HBASE-21784) | Dump replication queue should show list of wal files ordered chronologically | Major | Replication, tooling |
| [HBASE-22384](https://issues.apache.org/jira/browse/HBASE-22384) | Formatting issues in administration section of book | Minor | community, documentation |
| [HBASE-21658](https://issues.apache.org/jira/browse/HBASE-21658) | Should get the meta replica number from zk instead of config at client side | Critical | Client |
| [HBASE-22365](https://issues.apache.org/jira/browse/HBASE-22365) | Region may be opened on two RegionServers | Blocker | amv2 |
| [HBASE-22392](https://issues.apache.org/jira/browse/HBASE-22392) | Remove extra/useless + | Trivial | . |
| [HBASE-20494](https://issues.apache.org/jira/browse/HBASE-20494) | Upgrade com.yammer.metrics dependency | Major | dependencies |
| [HBASE-22358](https://issues.apache.org/jira/browse/HBASE-22358) | Change rubocop configuration for method length | Minor | community, shell |
| [HBASE-22379](https://issues.apache.org/jira/browse/HBASE-22379) | Fix Markdown for "Voting on Release Candidates" in book | Minor | community, documentation |
| [HBASE-22109](https://issues.apache.org/jira/browse/HBASE-22109) | Update hbase shaded content checker after guava update in hadoop branch-3.0 to 27.0-jre | Minor | . |
| [HBASE-22087](https://issues.apache.org/jira/browse/HBASE-22087) | Update LICENSE/shading for the dependencies from the latest Hadoop trunk | Minor | hadoop3 |
| [HBASE-22341](https://issues.apache.org/jira/browse/HBASE-22341) | Add explicit guidelines for removing deprecations in book | Major | API, community, documentation |
| [HBASE-22225](https://issues.apache.org/jira/browse/HBASE-22225) | Profiler tab on Master/RS UI not working w/o comprehensive message | Minor | UI |
| [HBASE-22291](https://issues.apache.org/jira/browse/HBASE-22291) | Fix recovery of recovered.edits files under root dir | Major | . |
| [HBASE-22283](https://issues.apache.org/jira/browse/HBASE-22283) | Print row and table information when failed to get region location | Major | Client, logging |
| [HBASE-22296](https://issues.apache.org/jira/browse/HBASE-22296) | Remove TestFromClientSide.testGetStartEndKeysWithRegionReplicas | Major | test |
| [HBASE-22250](https://issues.apache.org/jira/browse/HBASE-22250) | The same constants used in many places should be placed in constant classes | Minor | Client, conf, regionserver |
| [HBASE-20586](https://issues.apache.org/jira/browse/HBASE-20586) | SyncTable tool: Add support for cross-realm remote clusters | Major | mapreduce, Operability, Replication |
| [HBASE-21257](https://issues.apache.org/jira/browse/HBASE-21257) | misspelled words.[occured -\> occurred] | Trivial | . |
| [HBASE-22193](https://issues.apache.org/jira/browse/HBASE-22193) | Add backoff when region failed open too many times | Major | . |
| [HBASE-22188](https://issues.apache.org/jira/browse/HBASE-22188) | Make TestSplitMerge more stable | Major | test |
| [HBASE-22097](https://issues.apache.org/jira/browse/HBASE-22097) | Modify the description of split command in shell | Trivial | shell |
| [HBASE-21964](https://issues.apache.org/jira/browse/HBASE-21964) | unset Quota by Throttle Type | Major | master |
| [HBASE-22093](https://issues.apache.org/jira/browse/HBASE-22093) | Combine TestRestoreSnapshotFromClientWithRegionReplicas to CloneSnapshotFromClientAfterSplittingRegionTestBase#testCloneSnapshotAfterSplittingRegion | Major | . |
| [HBASE-22009](https://issues.apache.org/jira/browse/HBASE-22009) | Improve RSGroupInfoManagerImpl#getDefaultServers() | Minor | rsgroup |
| [HBASE-22032](https://issues.apache.org/jira/browse/HBASE-22032) | KeyValue validation should check for null byte array | Major | . |
| [HBASE-21667](https://issues.apache.org/jira/browse/HBASE-21667) | Move to latest ASF Parent POM | Minor | build |
| [HBASE-21810](https://issues.apache.org/jira/browse/HBASE-21810) | bulkload support set hfile compression on client | Major | mapreduce |
| [HBASE-21987](https://issues.apache.org/jira/browse/HBASE-21987) | Simplify RSGroupInfoManagerImpl#flushConfig() for offline mode | Minor | rsgroup |
| [HBASE-21871](https://issues.apache.org/jira/browse/HBASE-21871) | Support to specify a peer table name in VerifyReplication tool | Major | . |
| [HBASE-21255](https://issues.apache.org/jira/browse/HBASE-21255) | [acl] Refactor TablePermission into three classes (Global, Namespace, Table) | Major | . |
| [HBASE-21410](https://issues.apache.org/jira/browse/HBASE-21410) | A helper page that help find all problematic regions and procedures | Major | . |
| [HBASE-20734](https://issues.apache.org/jira/browse/HBASE-20734) | Colocate recovered edits directory with hbase.wal.dir | Major | MTTR, Recovery, wal |
| [HBASE-20401](https://issues.apache.org/jira/browse/HBASE-20401) | Make \`MAX\_WAIT\` and \`waitIfNotFinished\` in CleanerContext configurable | Minor | master |
| [HBASE-21481](https://issues.apache.org/jira/browse/HBASE-21481) | [acl] Superuser's permissions should not be granted or revoked by any non-su global admin | Major | . |
| [HBASE-21967](https://issues.apache.org/jira/browse/HBASE-21967) | Split TestServerCrashProcedure and TestServerCrashProcedureWithReplicas | Major | . |
| [HBASE-21867](https://issues.apache.org/jira/browse/HBASE-21867) | Support multi-threads in HFileArchiver | Major | . |
| [HBASE-21932](https://issues.apache.org/jira/browse/HBASE-21932) | Use Runtime.getRuntime().halt to terminate regionserver when abort timeout | Major | . |
| [HBASE-21875](https://issues.apache.org/jira/browse/HBASE-21875) | Change the retry logic in RSProcedureDispatcher to 'retry by default, only if xxx' | Major | proc-v2 |
| [HBASE-21780](https://issues.apache.org/jira/browse/HBASE-21780) | Avoid a wide line on the RegionServer webUI for many ZooKeeper servers | Minor | UI, Usability |
| [HBASE-21636](https://issues.apache.org/jira/browse/HBASE-21636) | Enhance the shell scan command to support missing scanner specifications like ReadType, IsolationLevel etc. | Major | shell |
| [HBASE-21857](https://issues.apache.org/jira/browse/HBASE-21857) | Do not need to check clusterKey if replicationEndpoint is provided when adding a peer | Major | . |
| [HBASE-21201](https://issues.apache.org/jira/browse/HBASE-21201) | Support to run VerifyReplication MR tool without peerid | Major | hbase-operator-tools |
| [HBASE-21816](https://issues.apache.org/jira/browse/HBASE-21816) | Print source cluster replication config directory | Trivial | Replication |
| [HBASE-19616](https://issues.apache.org/jira/browse/HBASE-19616) | Review of LogCleaner Class | Minor | . |
| [HBASE-21830](https://issues.apache.org/jira/browse/HBASE-21830) | Backport HBASE-20577 (Make Log Level page design consistent with the design of other pages in UI) to branch-2 | Major | UI, Usability |
| [HBASE-21833](https://issues.apache.org/jira/browse/HBASE-21833) | Use NettyAsyncFSWALConfigHelper.setEventLoopConfig to prevent creating too many netty event loop when executing TestHRegion | Minor | test |
| [HBASE-21634](https://issues.apache.org/jira/browse/HBASE-21634) | Print error message when user uses unacceptable values for LIMIT while setting quotas. | Minor | . |
| [HBASE-21789](https://issues.apache.org/jira/browse/HBASE-21789) | Rewrite MetaTableAccessor.multiMutate with Table.coprocessorService | Major | Client, Coprocessors |
| [HBASE-21689](https://issues.apache.org/jira/browse/HBASE-21689) | Make table/namespace specific current quota info available in shell(describe\_namespace & describe) | Minor | . |
| [HBASE-20215](https://issues.apache.org/jira/browse/HBASE-20215) | Rename CollectionUtils to ConcurrentMapUtils | Trivial | . |
| [HBASE-21720](https://issues.apache.org/jira/browse/HBASE-21720) | metric to measure how actions are distributed to servers within a MultiAction | Minor | Client, metrics, monitoring |
| [HBASE-21595](https://issues.apache.org/jira/browse/HBASE-21595) | Print thread's information and stack traces when RS is aborting forcibly | Minor | regionserver |
| [HBASE-20209](https://issues.apache.org/jira/browse/HBASE-20209) | Do Not Use Both Map containsKey and get Methods in Replication Sink | Trivial | Replication |
| [HBASE-21712](https://issues.apache.org/jira/browse/HBASE-21712) | Make submit-patch.py python3 compatible | Minor | tooling |
| [HBASE-21590](https://issues.apache.org/jira/browse/HBASE-21590) | Optimize trySkipToNextColumn in StoreScanner a bit | Critical | Performance, Scanners |
| [HBASE-21297](https://issues.apache.org/jira/browse/HBASE-21297) | ModifyTableProcedure can throw TNDE instead of IOE in case of REGION\_REPLICATION change | Minor | . |
| [HBASE-21700](https://issues.apache.org/jira/browse/HBASE-21700) | Simplify the implementation of RSGroupInfoManagerImpl | Major | rsgroup |
| [HBASE-21694](https://issues.apache.org/jira/browse/HBASE-21694) | Add append\_peer\_exclude\_tableCFs and remove\_peer\_exclude\_tableCFs shell commands | Major | . |
| [HBASE-21645](https://issues.apache.org/jira/browse/HBASE-21645) | Perform sanity check and disallow table creation/modification with region replication \< 1 | Minor | . |
| [HBASE-21360](https://issues.apache.org/jira/browse/HBASE-21360) | Disable printing of stack-trace in shell for quotas | Minor | shell |
| [HBASE-21662](https://issues.apache.org/jira/browse/HBASE-21662) | Add append\_peer\_exclude\_namespaces and remove\_peer\_exclude\_namespaces shell commands | Major | . |
| [HBASE-21659](https://issues.apache.org/jira/browse/HBASE-21659) | Avoid to load duplicate coprocessors in system config and table descriptor | Minor | . |
| [HBASE-21642](https://issues.apache.org/jira/browse/HBASE-21642) | CopyTable by reading snapshot and bulkloading will save a lot of time. | Major | . |
| [HBASE-21643](https://issues.apache.org/jira/browse/HBASE-21643) | Introduce two new region coprocessor method and deprecated postMutationBeforeWAL | Major | . |
| [HBASE-21640](https://issues.apache.org/jira/browse/HBASE-21640) | Remove the TODO when increment zero | Major | . |
| [HBASE-21631](https://issues.apache.org/jira/browse/HBASE-21631) | list\_quotas should print human readable values for LIMIT | Minor | shell |
| [HBASE-21635](https://issues.apache.org/jira/browse/HBASE-21635) | Use maven enforcer to ban imports from illegal packages | Major | build |
| [HBASE-21514](https://issues.apache.org/jira/browse/HBASE-21514) | Refactor CacheConfig | Major | . |
| [HBASE-21520](https://issues.apache.org/jira/browse/HBASE-21520) | TestMultiColumnScanner cost long time when using ROWCOL bloom type | Major | test |
| [HBASE-21554](https://issues.apache.org/jira/browse/HBASE-21554) | Show replication endpoint classname for replication peer on master web UI | Minor | UI |
| [HBASE-21549](https://issues.apache.org/jira/browse/HBASE-21549) | Add shell command for serial replication peer | Major | . |
| [HBASE-21283](https://issues.apache.org/jira/browse/HBASE-21283) | Add new shell command 'rit' for listing regions in transition | Minor | Operability, shell |
| [HBASE-21567](https://issues.apache.org/jira/browse/HBASE-21567) | Allow overriding configs starting up the shell | Major | shell |
| [HBASE-21413](https://issues.apache.org/jira/browse/HBASE-21413) | Empty meta log doesn't get split when restart whole cluster | Major | . |
| [HBASE-21524](https://issues.apache.org/jira/browse/HBASE-21524) | Unnecessary DEBUG log in ConnectionImplementation#isTableEnabled | Major | Client |
| [HBASE-21511](https://issues.apache.org/jira/browse/HBASE-21511) | Remove in progress snapshot check in SnapshotFileCache#getUnreferencedFiles | Minor | snapshots |
| [HBASE-21480](https://issues.apache.org/jira/browse/HBASE-21480) | Taking snapshot when RS crashes prevent we bring the regions online | Major | snapshots |
| [HBASE-21485](https://issues.apache.org/jira/browse/HBASE-21485) | Add more debug logs for remote procedure execution | Major | proc-v2 |
| [HBASE-21328](https://issues.apache.org/jira/browse/HBASE-21328) | add HBASE\_DISABLE\_HADOOP\_CLASSPATH\_LOOKUP switch to hbase-env.sh | Minor | documentation, Operability |
| [HBASE-19682](https://issues.apache.org/jira/browse/HBASE-19682) | Use Collections.emptyList() For Empty List Values | Minor | . |
| [HBASE-21388](https://issues.apache.org/jira/browse/HBASE-21388) | No need to instantiate MemStoreLAB for master which not carry table | Major | . |
| [HBASE-21325](https://issues.apache.org/jira/browse/HBASE-21325) | Force to terminate regionserver when abort hang in somewhere | Major | . |
| [HBASE-21385](https://issues.apache.org/jira/browse/HBASE-21385) | HTable.delete request use rpc call directly instead of AsyncProcess | Major | . |
| [HBASE-21318](https://issues.apache.org/jira/browse/HBASE-21318) | Make RefreshHFilesClient runnable | Minor | HFile |
| [HBASE-21263](https://issues.apache.org/jira/browse/HBASE-21263) | Mention compression algorithm along with other storefile details | Minor | . |
| [HBASE-21290](https://issues.apache.org/jira/browse/HBASE-21290) | No need to instantiate BlockCache for master which not carry table | Major | . |
| [HBASE-21256](https://issues.apache.org/jira/browse/HBASE-21256) | Improve IntegrationTestBigLinkedList for testing huge data | Major | integration tests |
| [HBASE-21251](https://issues.apache.org/jira/browse/HBASE-21251) | Refactor RegionMover | Major | Operability |
| [HBASE-21303](https://issues.apache.org/jira/browse/HBASE-21303) | [shell] clear\_deadservers with no args fails | Major | . |
| [HBASE-21098](https://issues.apache.org/jira/browse/HBASE-21098) | Improve Snapshot Performance with Temporary Snapshot Directory when rootDir on S3 | Major | . |
| [HBASE-21299](https://issues.apache.org/jira/browse/HBASE-21299) | List counts of actual region states in master UI tables section | Major | UI |
| [HBASE-21289](https://issues.apache.org/jira/browse/HBASE-21289) | Remove the log "'hbase.regionserver.maxlogs' was deprecated." in AbstractFSWAL | Minor | . |
| [HBASE-21185](https://issues.apache.org/jira/browse/HBASE-21185) | WALPrettyPrinter: Additional useful info to be printed by wal printer tool, for debugability purposes | Minor | Operability |
| [HBASE-21103](https://issues.apache.org/jira/browse/HBASE-21103) | nightly test cache of yetus install needs to be more thorough in verification | Major | test |
| [HBASE-21207](https://issues.apache.org/jira/browse/HBASE-21207) | Add client side sorting functionality in master web UI for table and region server details. | Minor | master, monitoring, UI, Usability |
| [HBASE-20857](https://issues.apache.org/jira/browse/HBASE-20857) | JMX - add Balancer status = enabled / disabled | Major | API, master, metrics, REST, tooling, Usability |
| [HBASE-21164](https://issues.apache.org/jira/browse/HBASE-21164) | reportForDuty to spew less log if master is initializing | Minor | regionserver |
| [HBASE-21204](https://issues.apache.org/jira/browse/HBASE-21204) | NPE when scan raw DELETE\_FAMILY\_VERSION and codec is not set | Major | . |
| [HBASE-20307](https://issues.apache.org/jira/browse/HBASE-20307) | LoadTestTool prints too much zookeeper logging | Minor | tooling |
| [HBASE-21155](https://issues.apache.org/jira/browse/HBASE-21155) | Save on a few log strings and some churn in wal splitter by skipping out early if no logs in dir | Trivial | . |
| [HBASE-21129](https://issues.apache.org/jira/browse/HBASE-21129) | Clean up duplicate codes in #equals and #hashCode methods of Filter | Minor | Filters |
| [HBASE-21157](https://issues.apache.org/jira/browse/HBASE-21157) | Split TableInputFormatScan to individual tests | Minor | test |
| [HBASE-21107](https://issues.apache.org/jira/browse/HBASE-21107) | add a metrics for netty direct memory | Minor | IPC/RPC |
| [HBASE-21153](https://issues.apache.org/jira/browse/HBASE-21153) | Shaded client jars should always build in relevant phase to avoid confusion | Major | build |
| [HBASE-21126](https://issues.apache.org/jira/browse/HBASE-21126) | Add ability for HBase Canary to ignore a configurable number of ZooKeeper down nodes | Minor | canary, Zookeeper |
| [HBASE-20749](https://issues.apache.org/jira/browse/HBASE-20749) | Upgrade our use of checkstyle to 8.6+ | Minor | build, community |
| [HBASE-21071](https://issues.apache.org/jira/browse/HBASE-21071) | HBaseTestingUtility::startMiniCluster() to use builder pattern | Major | test |
| [HBASE-20387](https://issues.apache.org/jira/browse/HBASE-20387) | flaky infrastructure should work for all branches | Critical | test |
| [HBASE-20469](https://issues.apache.org/jira/browse/HBASE-20469) | Directory used for sidelining old recovered edits files should be made configurable | Minor | . |
| [HBASE-20979](https://issues.apache.org/jira/browse/HBASE-20979) | Flaky test reporting should specify what JSON it needs and handle HTTP errors | Minor | test |
| [HBASE-20985](https://issues.apache.org/jira/browse/HBASE-20985) | add two attributes when we do normalization | Major | . |
| [HBASE-20965](https://issues.apache.org/jira/browse/HBASE-20965) | Separate region server report requests to new handlers | Major | Performance |
| [HBASE-20845](https://issues.apache.org/jira/browse/HBASE-20845) | Support set the consistency for Gets and Scans in thrift2 | Major | Thrift |
| [HBASE-20986](https://issues.apache.org/jira/browse/HBASE-20986) | Separate the config of block size when we do log splitting and write Hlog | Major | . |
| [HBASE-19036](https://issues.apache.org/jira/browse/HBASE-19036) | Add action in Chaos Monkey to restart Active Namenode | Minor | . |
| [HBASE-20856](https://issues.apache.org/jira/browse/HBASE-20856) | PITA having to set WAL provider in two places | Minor | Operability, wal |
| [HBASE-20935](https://issues.apache.org/jira/browse/HBASE-20935) | HStore.removeCompactedFiles should log in case it is unable to delete a file | Minor | . |
| [HBASE-20873](https://issues.apache.org/jira/browse/HBASE-20873) | Update doc for Endpoint-based Export | Minor | documentation |
| [HBASE-20672](https://issues.apache.org/jira/browse/HBASE-20672) | New metrics ReadRequestRate and WriteRequestRate | Minor | metrics |
| [HBASE-20617](https://issues.apache.org/jira/browse/HBASE-20617) | Upgrade/remove jetty-jsp | Minor | . |
| [HBASE-20396](https://issues.apache.org/jira/browse/HBASE-20396) | Remove redundant MBean from thrift JMX | Major | Thrift |
| [HBASE-20357](https://issues.apache.org/jira/browse/HBASE-20357) | AccessControlClient API Enhancement | Major | security |
### BUG FIXES:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-22563](https://issues.apache.org/jira/browse/HBASE-22563) | Reduce retained jobs for Jenkins pipelines | Major | . |
| [HBASE-22552](https://issues.apache.org/jira/browse/HBASE-22552) | Rewrite TestEndToEndSplitTransaction.testCanSplitJustAfterASplit | Major | test |
| [HBASE-22551](https://issues.apache.org/jira/browse/HBASE-22551) | TestMasterOperationsForRegionReplicas is flakey | Major | read replicas, test |
| [HBASE-22481](https://issues.apache.org/jira/browse/HBASE-22481) | Javadoc Warnings: reference not found | Trivial | documentation |
| [HBASE-22546](https://issues.apache.org/jira/browse/HBASE-22546) | TestRegionServerHostname#testRegionServerHostname fails reliably for me | Major | . |
| [HBASE-22534](https://issues.apache.org/jira/browse/HBASE-22534) | TestCellUtil fails when run on JDK11 | Minor | java, test |
| [HBASE-22536](https://issues.apache.org/jira/browse/HBASE-22536) | TestForeignExceptionSerialization fails when run on JDK11 | Minor | java |
| [HBASE-22535](https://issues.apache.org/jira/browse/HBASE-22535) | TestShellRSGroups fails when run on JDK11 | Minor | java, shell |
| [HBASE-22518](https://issues.apache.org/jira/browse/HBASE-22518) | yetus personality is treating branch-1.4 like earlier branches for hadoopcheck | Major | test |
| [HBASE-22513](https://issues.apache.org/jira/browse/HBASE-22513) | Admin#getQuota does not work correctly if exceedThrottleQuota is set | Major | Quotas |
| [HBASE-22522](https://issues.apache.org/jira/browse/HBASE-22522) | The integration test in master branch's nightly job has error "ERROR: Only found 1050 rows." | Major | . |
| [HBASE-22490](https://issues.apache.org/jira/browse/HBASE-22490) | Nightly client integration test fails with hadoop-3 | Major | build |
| [HBASE-22502](https://issues.apache.org/jira/browse/HBASE-22502) | Purge the logs when we reach the EOF for the last wal file when replication | Major | . |
| [HBASE-22503](https://issues.apache.org/jira/browse/HBASE-22503) | Failed to upgrade to 2.2+ as the global permission which storaged in zk is not right | Blocker | . |
| [HBASE-22487](https://issues.apache.org/jira/browse/HBASE-22487) | getMostLoadedRegions is unused | Trivial | regionserver |
| [HBASE-22485](https://issues.apache.org/jira/browse/HBASE-22485) | Fix failed ut TestClusterRestartFailover | Major | . |
| [HBASE-22486](https://issues.apache.org/jira/browse/HBASE-22486) | Fix flaky test TestLockManager | Major | . |
| [HBASE-22471](https://issues.apache.org/jira/browse/HBASE-22471) | Our nightly jobs for master and branch-2 are still using hadoop-2.7.1 in integration test | Major | build |
| [HBASE-22003](https://issues.apache.org/jira/browse/HBASE-22003) | Fix flaky test TestVerifyReplication.testHBase14905 | Major | . |
| [HBASE-22441](https://issues.apache.org/jira/browse/HBASE-22441) | BucketCache NullPointerException in cacheBlock | Major | BucketCache |
| [HBASE-22473](https://issues.apache.org/jira/browse/HBASE-22473) | Split TestSCP | Major | Recovery, test |
| [HBASE-22456](https://issues.apache.org/jira/browse/HBASE-22456) | Polish TestSplitTransitionOnCluster | Major | test |
| [HBASE-21800](https://issues.apache.org/jira/browse/HBASE-21800) | RegionServer aborted due to NPE from MetaTableMetrics coprocessor | Critical | Coprocessors, meta, metrics, Operability |
| [HBASE-22462](https://issues.apache.org/jira/browse/HBASE-22462) | Should run a 'mvn install' at the end of hadoop check in pre commit job | Major | build |
| [HBASE-22440](https://issues.apache.org/jira/browse/HBASE-22440) | HRegionServer#getWalGroupsReplicationStatus() throws NPE | Major | regionserver, Replication |
| [HBASE-22226](https://issues.apache.org/jira/browse/HBASE-22226) | Incorrect level for headings in asciidoc | Trivial | documentation |
| [HBASE-22442](https://issues.apache.org/jira/browse/HBASE-22442) | Nightly build is failing with hadoop 3.x | Major | build, hadoop3 |
| [HBASE-20970](https://issues.apache.org/jira/browse/HBASE-20970) | Update hadoop check versions for hadoop3 in hbase-personality | Major | build |
| [HBASE-22424](https://issues.apache.org/jira/browse/HBASE-22424) | Interactions in RSGroup test classes will cause TestRSGroupsAdmin2.testMoveServersAndTables and TestRSGroupsBalance.testGroupBalance flaky | Major | rsgroup |
| [HBASE-22404](https://issues.apache.org/jira/browse/HBASE-22404) | Open/Close region request may be executed twice when master restart | Major | . |
| [HBASE-22274](https://issues.apache.org/jira/browse/HBASE-22274) | Cell size limit check on append should consider cell's previous size. | Minor | . |
| [HBASE-22072](https://issues.apache.org/jira/browse/HBASE-22072) | High read/write intensive regions may cause long crash recovery | Major | Performance, Recovery |
| [HBASE-22324](https://issues.apache.org/jira/browse/HBASE-22324) | loss a mass of data when the sequenceId of cells greater than Integer.Max, because MemStoreMergerSegmentsIterator can not merge segments | Blocker | in-memory-compaction |
| [HBASE-21777](https://issues.apache.org/jira/browse/HBASE-21777) | "Tune compaction throughput" debug messages even when nothing has changed | Trivial | Compaction |
| [HBASE-22360](https://issues.apache.org/jira/browse/HBASE-22360) | Abort timer doesn't set when abort is called during graceful shutdown process | Major | regionserver |
| [HBASE-20851](https://issues.apache.org/jira/browse/HBASE-20851) | Change rubocop config for max line length of 100 | Minor | community, shell |
| [HBASE-21467](https://issues.apache.org/jira/browse/HBASE-21467) | Fix flaky test TestCoprocessorClassLoader.testCleanupOldJars | Minor | . |
| [HBASE-22312](https://issues.apache.org/jira/browse/HBASE-22312) | Hadoop 3 profile for hbase-shaded-mapreduce should like mapreduce as a provided dependency | Major | mapreduce, shading |
| [HBASE-22314](https://issues.apache.org/jira/browse/HBASE-22314) | shaded byo-hadoop client should list needed hadoop modules as provided scope to avoid inclusion of unnecessary transitive depednencies | Major | hadoop2, hadoop3, shading |
| [HBASE-22047](https://issues.apache.org/jira/browse/HBASE-22047) | LeaseException in Scan should be retired | Major | Client, Scanners |
| [HBASE-22343](https://issues.apache.org/jira/browse/HBASE-22343) | Make procedure retry interval configurable in test | Major | amv2, test |
| [HBASE-22190](https://issues.apache.org/jira/browse/HBASE-22190) | SnapshotFileCache may fail to load the correct snapshot file list when there is an on-going snapshot operation | Blocker | snapshots |
| [HBASE-22354](https://issues.apache.org/jira/browse/HBASE-22354) | master never sets abortRequested, and thus abort timeout doesn't work for it | Major | . |
| [HBASE-22350](https://issues.apache.org/jira/browse/HBASE-22350) | Rewrite TestClientOperationTimeout so we do not timeout when creating table | Major | test |
| [HBASE-22340](https://issues.apache.org/jira/browse/HBASE-22340) | Corrupt KeyValue is silently ignored | Critical | wal |
| [HBASE-22054](https://issues.apache.org/jira/browse/HBASE-22054) | Space Quota: Compaction is not working for super user in case of NO\_WRITES\_COMPACTIONS | Minor | . |
| [HBASE-22236](https://issues.apache.org/jira/browse/HBASE-22236) | AsyncNonMetaRegionLocator should not cache HRegionLocation with null location | Major | asyncclient |
| [HBASE-22086](https://issues.apache.org/jira/browse/HBASE-22086) | space quota issue: deleting snapshot doesn't update the usage of table | Minor | . |
| [HBASE-22298](https://issues.apache.org/jira/browse/HBASE-22298) | branch-2.2 nightly fails "[ForOverride] Method annotated @ForOverride must have protected or package-private visibility" | Major | . |
| [HBASE-22292](https://issues.apache.org/jira/browse/HBASE-22292) | PreemptiveFastFailInterceptor clean repeatedFailuresMap issue | Blocker | . |
| [HBASE-22230](https://issues.apache.org/jira/browse/HBASE-22230) | REST Server drops connection on long scans | Major | . |
| [HBASE-22200](https://issues.apache.org/jira/browse/HBASE-22200) | WALSplitter.hasRecoveredEdits should use same FS instance from WAL region dir | Major | wal |
| [HBASE-22286](https://issues.apache.org/jira/browse/HBASE-22286) | License handling incorrectly lists CDDL/GPLv2+CE as safe to not aggregate | Critical | build, community |
| [HBASE-22282](https://issues.apache.org/jira/browse/HBASE-22282) | Should deal with error in the callback of RawAsyncHBaseAdmin.splitRegion methods | Major | Admin, asyncclient |
| [HBASE-22278](https://issues.apache.org/jira/browse/HBASE-22278) | RawAsyncHBaseAdmin should not use cached region location | Major | Admin, asyncclient |
| [HBASE-22222](https://issues.apache.org/jira/browse/HBASE-22222) | Site build fails after hbase-thirdparty upgrade | Blocker | website |
| [HBASE-22249](https://issues.apache.org/jira/browse/HBASE-22249) | Rest Server throws NoClassDefFoundError with Java 11 (run-time) | Major | . |
| [HBASE-22235](https://issues.apache.org/jira/browse/HBASE-22235) | OperationStatus.{SUCCESS\|FAILURE\|NOT\_RUN} are not visible to 3rd party coprocessors | Major | Coprocessors |
| [HBASE-22207](https://issues.apache.org/jira/browse/HBASE-22207) | Fix flakey TestAssignmentManager.testAssignSocketTimeout | Major | test |
| [HBASE-22202](https://issues.apache.org/jira/browse/HBASE-22202) | Fix new findbugs issues after we upgrade hbase-thirdparty dependencies | Major | findbugs |
| [HBASE-22144](https://issues.apache.org/jira/browse/HBASE-22144) | MultiRowRangeFilter does not work with reversed scans | Critical | Filters, Scanners |
| [HBASE-22198](https://issues.apache.org/jira/browse/HBASE-22198) | Fix flakey TestAsyncTableGetMultiThreaded | Major | test |
| [HBASE-22185](https://issues.apache.org/jira/browse/HBASE-22185) | RAMQueueEntry#writeToCache should freeBlock if any exception encountered instead of the IOException catch block | Major | . |
| [HBASE-22163](https://issues.apache.org/jira/browse/HBASE-22163) | Should not archive the compacted store files when region warmup | Blocker | . |
| [HBASE-22178](https://issues.apache.org/jira/browse/HBASE-22178) | Introduce a createTableAsync with TableDescriptor method in Admin | Major | Admin |
| [HBASE-22180](https://issues.apache.org/jira/browse/HBASE-22180) | Make TestBlockEvictionFromClient.testBlockRefCountAfterSplits more stable | Major | test |
| [HBASE-22179](https://issues.apache.org/jira/browse/HBASE-22179) | Fix RawAsyncHBaseAdmin.getCompactionState | Major | Admin, asyncclient |
| [HBASE-22177](https://issues.apache.org/jira/browse/HBASE-22177) | Do not recreate IOException in RawAsyncHBaseAdmin.adminCall | Major | Admin, asyncclient |
| [HBASE-22070](https://issues.apache.org/jira/browse/HBASE-22070) | Checking restoreDir in RestoreSnapshotHelper | Minor | snapshots |
| [HBASE-20912](https://issues.apache.org/jira/browse/HBASE-20912) | Add import order config in dev support for eclipse | Major | . |
| [HBASE-22133](https://issues.apache.org/jira/browse/HBASE-22133) | Forward port HBASE-22073 "/rits.jsp throws an exception if no procedure" to branch-2.2+ | Major | UI |
| [HBASE-20911](https://issues.apache.org/jira/browse/HBASE-20911) | correct Swtich/case indentation in formatter template for eclipse | Major | . |
| [HBASE-21688](https://issues.apache.org/jira/browse/HBASE-21688) | Address WAL filesystem issues | Major | Filesystem Integration, wal |
| [HBASE-22121](https://issues.apache.org/jira/browse/HBASE-22121) | AsyncAdmin can not deal with non default meta replica | Major | Admin, asyncclient, Client |
| [HBASE-22115](https://issues.apache.org/jira/browse/HBASE-22115) | HBase RPC aspires to grow an infinite tree of trace scopes; some other places are also unsafe | Critical | . |
| [HBASE-22123](https://issues.apache.org/jira/browse/HBASE-22123) | REST gateway reports Insufficient permissions exceptions as 404 Not Found | Minor | REST |
| [HBASE-21135](https://issues.apache.org/jira/browse/HBASE-21135) | Build fails on windows as it fails to parse windows path during license check | Major | build |
| [HBASE-21781](https://issues.apache.org/jira/browse/HBASE-21781) | list\_deadservers elapsed time is incorrect | Major | shell |
| [HBASE-22100](https://issues.apache.org/jira/browse/HBASE-22100) | False positive for error prone warnings in pre commit job | Minor | build |
| [HBASE-22098](https://issues.apache.org/jira/browse/HBASE-22098) | Backport HBASE-18667 "Disable error-prone for hbase-protocol-shaded" to branch-2 | Major | build |
| [HBASE-20662](https://issues.apache.org/jira/browse/HBASE-20662) | Increasing space quota on a violated table does not remove SpaceViolationPolicy.DISABLE enforcement | Major | . |
| [HBASE-22057](https://issues.apache.org/jira/browse/HBASE-22057) | Impose upper-bound on size of ZK ops sent in a single multi() | Major | . |
| [HBASE-22074](https://issues.apache.org/jira/browse/HBASE-22074) | Should use procedure store to persist the state in reportRegionStateTransition | Blocker | amv2, proc-v2 |
| [HBASE-21619](https://issues.apache.org/jira/browse/HBASE-21619) | Fix warning message caused by incorrect ternary operator evaluation | Trivial | . |
| [HBASE-22095](https://issues.apache.org/jira/browse/HBASE-22095) | Taking a snapshot fails in local mode | Major | . |
| [HBASE-22061](https://issues.apache.org/jira/browse/HBASE-22061) | SplitTableRegionProcedure should hold the lock of its daughter regions | Major | . |
| [HBASE-22045](https://issues.apache.org/jira/browse/HBASE-22045) | Mutable range histogram reports incorrect outliers | Major | . |
| [HBASE-21736](https://issues.apache.org/jira/browse/HBASE-21736) | Remove the server from online servers before scheduling SCP for it in hbck | Major | hbck2, test |
| [HBASE-22011](https://issues.apache.org/jira/browse/HBASE-22011) | ThriftUtilities.getFromThrift should set filter when not set columns | Major | . |
| [HBASE-21990](https://issues.apache.org/jira/browse/HBASE-21990) | puppycrawl checkstyle dtds 404... moved to sourceforge | Major | build |
| [HBASE-22010](https://issues.apache.org/jira/browse/HBASE-22010) | docs on upgrade from 2.0,2.1 -\> 2.2 renders incorrectly | Minor | documentation |
| [HBASE-22006](https://issues.apache.org/jira/browse/HBASE-22006) | Fix branch-2.1 findbugs warning; causes nightly show as failed. | Major | . |
| [HBASE-21960](https://issues.apache.org/jira/browse/HBASE-21960) | RESTServletContainer not configured for REST Jetty server | Blocker | REST |
| [HBASE-21915](https://issues.apache.org/jira/browse/HBASE-21915) | FileLink$FileLinkInputStream doesn't implement CanUnbuffer | Major | Filesystem Integration |
| [HBASE-21565](https://issues.apache.org/jira/browse/HBASE-21565) | Delete dead server from dead server list too early leads to concurrent Server Crash Procedures(SCP) for a same server | Critical | . |
| [HBASE-21740](https://issues.apache.org/jira/browse/HBASE-21740) | NPE happens while shutdown the RS | Major | . |
| [HBASE-21866](https://issues.apache.org/jira/browse/HBASE-21866) | Do not move the table to null rsgroup when creating an existing table | Major | proc-v2, rsgroup |
| [HBASE-21983](https://issues.apache.org/jira/browse/HBASE-21983) | Should track the scan metrics in AsyncScanSingleRegionRpcRetryingCaller if scan metrics is enabled | Major | asyncclient, Client |
| [HBASE-21980](https://issues.apache.org/jira/browse/HBASE-21980) | Fix typo in AbstractTestAsyncTableRegionReplicasRead | Major | test |
| [HBASE-21487](https://issues.apache.org/jira/browse/HBASE-21487) | Concurrent modify table ops can lead to unexpected results | Major | . |
| [HBASE-20724](https://issues.apache.org/jira/browse/HBASE-20724) | Sometimes some compacted storefiles are still opened after region failover | Critical | . |
| [HBASE-21961](https://issues.apache.org/jira/browse/HBASE-21961) | Infinite loop in AsyncNonMetaRegionLocator if there is only one region and we tried to locate before a non empty row | Critical | asyncclient, Client |
| [HBASE-21943](https://issues.apache.org/jira/browse/HBASE-21943) | The usage of RegionLocations.mergeRegionLocations is wrong for async client | Critical | asyncclient, Client |
| [HBASE-21947](https://issues.apache.org/jira/browse/HBASE-21947) | TestShell is broken after we remove the jackson dependencies | Major | dependencies, shell |
| [HBASE-21942](https://issues.apache.org/jira/browse/HBASE-21942) | [UI] requests per second is incorrect in rsgroup page(rsgroup.jsp) | Minor | . |
| [HBASE-21922](https://issues.apache.org/jira/browse/HBASE-21922) | BloomContext#sanityCheck may failed when use ROWPREFIX\_DELIMITED bloom filter | Major | . |
| [HBASE-21929](https://issues.apache.org/jira/browse/HBASE-21929) | The checks at the end of TestRpcClientLeaks are not executed | Major | test |
| [HBASE-21938](https://issues.apache.org/jira/browse/HBASE-21938) | Add a new ClusterMetrics.Option SERVERS\_NAME to only return the live region servers's name without metrics | Major | . |
| [HBASE-21928](https://issues.apache.org/jira/browse/HBASE-21928) | Deprecated HConstants.META\_QOS | Major | Client, rpc |
| [HBASE-21899](https://issues.apache.org/jira/browse/HBASE-21899) | Fix missing variables in slf4j Logger | Trivial | logging |
| [HBASE-21910](https://issues.apache.org/jira/browse/HBASE-21910) | The nonce implementation is wrong for AsyncTable | Critical | asyncclient, Client |
| [HBASE-21900](https://issues.apache.org/jira/browse/HBASE-21900) | Infinite loop in AsyncMetaRegionLocator if we can not get the location for meta | Major | asyncclient, Client |
| [HBASE-21890](https://issues.apache.org/jira/browse/HBASE-21890) | Use execute instead of submit to submit a task in RemoteProcedureDispatcher | Critical | proc-v2 |
| [HBASE-21889](https://issues.apache.org/jira/browse/HBASE-21889) | Use thrift 0.12.0 when build thrift by compile-thrift profile | Major | . |
| [HBASE-21785](https://issues.apache.org/jira/browse/HBASE-21785) | master reports open regions as RITs and also messes up rit age metric | Major | . |
| [HBASE-21854](https://issues.apache.org/jira/browse/HBASE-21854) | Race condition in TestProcedureSkipPersistence | Minor | proc-v2 |
| [HBASE-21862](https://issues.apache.org/jira/browse/HBASE-21862) | IPCUtil.wrapException should keep the original exception types for all the connection exceptions | Blocker | . |
| [HBASE-18484](https://issues.apache.org/jira/browse/HBASE-18484) | VerifyRep by snapshot does not work when Yarn / SourceHBase / PeerHBase located in different HDFS clusters | Major | Replication |
| [HBASE-21775](https://issues.apache.org/jira/browse/HBASE-21775) | The BufferedMutator doesn't ever refresh region location cache | Major | Client |
| [HBASE-21843](https://issues.apache.org/jira/browse/HBASE-21843) | RegionGroupingProvider breaks the meta wal file name pattern which may cause data loss for meta region | Blocker | wal |
| [HBASE-21795](https://issues.apache.org/jira/browse/HBASE-21795) | Client application may get stuck (time bound) if a table modify op is called immediately after split op | Critical | amv2 |
| [HBASE-21840](https://issues.apache.org/jira/browse/HBASE-21840) | TestHRegionWithInMemoryFlush fails with NPE | Blocker | test |
| [HBASE-21811](https://issues.apache.org/jira/browse/HBASE-21811) | region can be opened on two servers due to race condition with procedures and server reports | Blocker | amv2 |
| [HBASE-21644](https://issues.apache.org/jira/browse/HBASE-21644) | Modify table procedure runs infinitely for a table having region replication \> 1 | Critical | Admin |
| [HBASE-21733](https://issues.apache.org/jira/browse/HBASE-21733) | SnapshotQuotaObserverChore should only fetch space quotas | Major | . |
| [HBASE-21699](https://issues.apache.org/jira/browse/HBASE-21699) | Create table failed when using SPLITS\_FILE =\> 'splits.txt' | Blocker | Client, shell |
| [HBASE-21535](https://issues.apache.org/jira/browse/HBASE-21535) | Zombie Master detector is not working | Critical | master |
| [HBASE-21770](https://issues.apache.org/jira/browse/HBASE-21770) | Should deal with meta table in HRegionLocator.getAllRegionLocations | Major | Client |
| [HBASE-21754](https://issues.apache.org/jira/browse/HBASE-21754) | ReportRegionStateTransitionRequest should be executed in priority executor | Major | . |
| [HBASE-21475](https://issues.apache.org/jira/browse/HBASE-21475) | Put mutation (having TTL set) added via co-processor is retrieved even after TTL expires | Major | Coprocessors |
| [HBASE-21749](https://issues.apache.org/jira/browse/HBASE-21749) | RS UI may throw NPE and make rs-status page inaccessible with multiwal and replication | Major | Replication, UI |
| [HBASE-21746](https://issues.apache.org/jira/browse/HBASE-21746) | Fix two concern cases in RegionMover | Major | . |
| [HBASE-21732](https://issues.apache.org/jira/browse/HBASE-21732) | Should call toUpperCase before using Enum.valueOf in some methods for ColumnFamilyDescriptor | Critical | Client |
| [HBASE-21704](https://issues.apache.org/jira/browse/HBASE-21704) | The implementation of DistributedHBaseCluster.getServerHoldingRegion is incorrect | Major | . |
| [HBASE-20917](https://issues.apache.org/jira/browse/HBASE-20917) | MetaTableMetrics#stop references uninitialized requestsMap for non-meta region | Major | meta, metrics |
| [HBASE-21639](https://issues.apache.org/jira/browse/HBASE-21639) | maxHeapUsage value not read properly from config during EntryBuffers initialization | Minor | . |
| [HBASE-21225](https://issues.apache.org/jira/browse/HBASE-21225) | Having RPC & Space quota on a table/Namespace doesn't allow space quota to be removed using 'NONE' | Major | . |
| [HBASE-21707](https://issues.apache.org/jira/browse/HBASE-21707) | Fix warnings in hbase-rsgroup module and also make the UTs more stable | Major | Region Assignment, rsgroup |
| [HBASE-20220](https://issues.apache.org/jira/browse/HBASE-20220) | [RSGroup] Check if table exists in the cluster before moving it to the specified regionserver group | Major | rsgroup |
| [HBASE-21691](https://issues.apache.org/jira/browse/HBASE-21691) | Fix flaky test TestRecoveredEdits | Major | . |
| [HBASE-21695](https://issues.apache.org/jira/browse/HBASE-21695) | Fix flaky test TestRegionServerAbortTimeout | Major | . |
| [HBASE-21614](https://issues.apache.org/jira/browse/HBASE-21614) | RIT recovery with ServerCrashProcedure doesn't account for all regions | Critical | amv2 |
| [HBASE-21618](https://issues.apache.org/jira/browse/HBASE-21618) | Scan with the same startRow(inclusive=true) and stopRow(inclusive=false) returns one result | Critical | Client |
| [HBASE-21683](https://issues.apache.org/jira/browse/HBASE-21683) | Reset readsEnabled flag after successfully flushing the primary region | Critical | read replicas |
| [HBASE-21630](https://issues.apache.org/jira/browse/HBASE-21630) | [shell] Define ENDKEY == STOPROW (we have ENDROW) | Trivial | shell |
| [HBASE-21547](https://issues.apache.org/jira/browse/HBASE-21547) | Precommit uses master flaky list for other branches | Major | test |
| [HBASE-21660](https://issues.apache.org/jira/browse/HBASE-21660) | Apply the cell to right memstore for increment/append operation | Major | . |
| [HBASE-21646](https://issues.apache.org/jira/browse/HBASE-21646) | Flakey TestTableSnapshotInputFormat; DisableTable not completing... | Major | test |
| [HBASE-21545](https://issues.apache.org/jira/browse/HBASE-21545) | NEW\_VERSION\_BEHAVIOR breaks Get/Scan with specified columns | Major | API |
| [HBASE-21629](https://issues.apache.org/jira/browse/HBASE-21629) | draining\_servers.rb is broken | Major | scripts |
| [HBASE-21621](https://issues.apache.org/jira/browse/HBASE-21621) | Reversed scan does not return expected number of rows | Critical | Scanners |
| [HBASE-21620](https://issues.apache.org/jira/browse/HBASE-21620) | Problem in scan query when using more than one column prefix filter in some cases. | Major | Scanners |
| [HBASE-21610](https://issues.apache.org/jira/browse/HBASE-21610) | numOpenConnections metric is set to -1 when zero server channel exist | Minor | metrics |
| [HBASE-21498](https://issues.apache.org/jira/browse/HBASE-21498) | Master OOM when SplitTableRegionProcedure new CacheConfig and instantiate a new BlockCache | Major | . |
| [HBASE-21592](https://issues.apache.org/jira/browse/HBASE-21592) | quota.addGetResult(r) throw NPE | Major | . |
| [HBASE-21589](https://issues.apache.org/jira/browse/HBASE-21589) | TestCleanupMetaWAL fails | Blocker | test, wal |
| [HBASE-21575](https://issues.apache.org/jira/browse/HBASE-21575) | memstore above high watermark message is logged too much | Minor | logging, regionserver |
| [HBASE-21582](https://issues.apache.org/jira/browse/HBASE-21582) | If call HBaseAdmin#snapshotAsync but forget call isSnapshotFinished, then SnapshotHFileCleaner will skip to run every time | Major | . |
| [HBASE-21568](https://issues.apache.org/jira/browse/HBASE-21568) | Disable use of BlockCache for LoadIncrementalHFiles | Major | Client |
| [HBASE-21453](https://issues.apache.org/jira/browse/HBASE-21453) | Convert ReadOnlyZKClient to DEBUG instead of INFO | Major | logging, Zookeeper |
| [HBASE-21559](https://issues.apache.org/jira/browse/HBASE-21559) | The RestoreSnapshotFromClientTestBase related UT are flaky | Major | . |
| [HBASE-21551](https://issues.apache.org/jira/browse/HBASE-21551) | Memory leak when use scan with STREAM at server side | Blocker | regionserver |
| [HBASE-21550](https://issues.apache.org/jira/browse/HBASE-21550) | Add a new method preCreateTableRegionInfos for MasterObserver which allows CPs to modify the TableDescriptor | Major | Coprocessors |
| [HBASE-21479](https://issues.apache.org/jira/browse/HBASE-21479) | Individual tests in TestHRegionReplayEvents class are failing | Major | . |
| [HBASE-21518](https://issues.apache.org/jira/browse/HBASE-21518) | TestMasterFailoverWithProcedures is flaky | Major | . |
| [HBASE-21504](https://issues.apache.org/jira/browse/HBASE-21504) | If enable FIFOCompactionPolicy, a compaction may write a "empty" hfile whose maxTimeStamp is long max. This kind of hfile will never be archived. | Critical | Compaction |
| [HBASE-21300](https://issues.apache.org/jira/browse/HBASE-21300) | Fix the wrong reference file path when restoring snapshots for tables with MOB columns | Major | . |
| [HBASE-21507](https://issues.apache.org/jira/browse/HBASE-21507) | Compaction failed when execute AbstractMultiFileWriter.beforeShipped() method | Major | Compaction, regionserver |
| [HBASE-21387](https://issues.apache.org/jira/browse/HBASE-21387) | Race condition surrounding in progress snapshot handling in snapshot cache leads to loss of snapshot files | Major | snapshots |
| [HBASE-21503](https://issues.apache.org/jira/browse/HBASE-21503) | Replication normal source can get stuck due potential race conditions between source wal reader and wal provider initialization threads. | Blocker | Replication |
| [HBASE-21466](https://issues.apache.org/jira/browse/HBASE-21466) | WALProcedureStore uses wrong FileSystem if wal.dir is not under rootdir | Major | . |
| [HBASE-21445](https://issues.apache.org/jira/browse/HBASE-21445) | CopyTable by bulkload will write hfile into yarn's HDFS | Major | mapreduce |
| [HBASE-21437](https://issues.apache.org/jira/browse/HBASE-21437) | Bypassed procedure throw IllegalArgumentException when its state is WAITING\_TIMEOUT | Major | . |
| [HBASE-21439](https://issues.apache.org/jira/browse/HBASE-21439) | StochasticLoadBalancer RegionLoads aren’t being used in RegionLoad cost functions | Major | Balancer |
| [HBASE-20604](https://issues.apache.org/jira/browse/HBASE-20604) | ProtobufLogReader#readNext can incorrectly loop to the same position in the stream until the the WAL is rolled | Critical | Replication, wal |
| [HBASE-21247](https://issues.apache.org/jira/browse/HBASE-21247) | Custom Meta WAL Provider doesn't default to custom WAL Provider whose configuration value is outside the enums in Providers | Major | wal |
| [HBASE-21430](https://issues.apache.org/jira/browse/HBASE-21430) | [hbase-connectors] Move hbase-spark\* modules to hbase-connectors repo | Major | hbase-connectors, spark |
| [HBASE-21438](https://issues.apache.org/jira/browse/HBASE-21438) | TestAdmin2#testGetProcedures fails due to FailedProcedure inaccessible | Major | . |
| [HBASE-21425](https://issues.apache.org/jira/browse/HBASE-21425) | 2.1.1 fails to start over 1.x data; namespace not assigned | Critical | amv2 |
| [HBASE-21407](https://issues.apache.org/jira/browse/HBASE-21407) | Resolve NPE in backup Master UI | Minor | UI |
| [HBASE-21422](https://issues.apache.org/jira/browse/HBASE-21422) | NPE in TestMergeTableRegionsProcedure.testMergeWithoutPONR | Major | proc-v2, test |
| [HBASE-21424](https://issues.apache.org/jira/browse/HBASE-21424) | Change flakies and nightlies so scheduled less often | Major | build |
| [HBASE-21417](https://issues.apache.org/jira/browse/HBASE-21417) | Pre commit build is broken due to surefire plugin crashes | Critical | build |
| [HBASE-21371](https://issues.apache.org/jira/browse/HBASE-21371) | Hbase unable to compile against Hadoop trunk (3.3.0-SNAPSHOT) due to license error | Major | . |
| [HBASE-21391](https://issues.apache.org/jira/browse/HBASE-21391) | RefreshPeerProcedure should also wait master initialized before executing | Major | Replication |
| [HBASE-21342](https://issues.apache.org/jira/browse/HBASE-21342) | FileSystem in use may get closed by other bulk load call in secure bulkLoad | Major | . |
| [HBASE-21349](https://issues.apache.org/jira/browse/HBASE-21349) | Cluster is going down but CatalogJanitor and Normalizer try to run and fail noisely | Minor | . |
| [HBASE-21356](https://issues.apache.org/jira/browse/HBASE-21356) | bulkLoadHFile API should ensure that rs has the source hfile's write permission | Major | . |
| [HBASE-21355](https://issues.apache.org/jira/browse/HBASE-21355) | HStore's storeSize is calculated repeatedly which causing the confusing region split | Blocker | regionserver |
| [HBASE-21334](https://issues.apache.org/jira/browse/HBASE-21334) | TestMergeTableRegionsProcedure is flakey | Major | amv2, proc-v2, test |
| [HBASE-21178](https://issues.apache.org/jira/browse/HBASE-21178) | [BC break] : Get and Scan operation with a custom converter\_class not working | Critical | shell |
| [HBASE-21200](https://issues.apache.org/jira/browse/HBASE-21200) | Memstore flush doesn't finish because of seekToPreviousRow() in memstore scanner. | Critical | Scanners |
| [HBASE-21292](https://issues.apache.org/jira/browse/HBASE-21292) | IdLock.getLockEntry() may hang if interrupted | Major | . |
| [HBASE-21335](https://issues.apache.org/jira/browse/HBASE-21335) | Change the default wait time of HBCK2 tool | Critical | . |
| [HBASE-21291](https://issues.apache.org/jira/browse/HBASE-21291) | Add a test for bypassing stuck state-machine procedures | Major | . |
| [HBASE-21055](https://issues.apache.org/jira/browse/HBASE-21055) | NullPointerException when balanceOverall() but server balance info is null | Major | Balancer |
| [HBASE-21327](https://issues.apache.org/jira/browse/HBASE-21327) | Fix minor logging issue where we don't report servername if no associated SCP | Trivial | amv2 |
| [HBASE-21320](https://issues.apache.org/jira/browse/HBASE-21320) | [canary] Cleanup of usage and add commentary | Major | canary |
| [HBASE-21266](https://issues.apache.org/jira/browse/HBASE-21266) | Not running balancer because processing dead regionservers, but empty dead rs list | Major | . |
| [HBASE-21260](https://issues.apache.org/jira/browse/HBASE-21260) | The whole balancer plans might be aborted if there are more than one plans to move a same region | Major | Balancer, master |
| [HBASE-21280](https://issues.apache.org/jira/browse/HBASE-21280) | Add anchors for each heading in UI | Trivial | UI, Usability |
| [HBASE-20764](https://issues.apache.org/jira/browse/HBASE-20764) | build broken when latest commit is gpg signed | Critical | build |
| [HBASE-18549](https://issues.apache.org/jira/browse/HBASE-18549) | Unclaimed replication queues can go undetected | Critical | Replication |
| [HBASE-21248](https://issues.apache.org/jira/browse/HBASE-21248) | Implement exponential backoff when retrying for ModifyPeerProcedure | Major | proc-v2, Replication |
| [HBASE-21196](https://issues.apache.org/jira/browse/HBASE-21196) | HTableMultiplexer clears the meta cache after every put operation | Critical | Performance |
| [HBASE-19418](https://issues.apache.org/jira/browse/HBASE-19418) | RANGE\_OF\_DELAY in PeriodicMemstoreFlusher should be configurable. | Minor | . |
| [HBASE-18451](https://issues.apache.org/jira/browse/HBASE-18451) | PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request | Major | regionserver |
| [HBASE-21228](https://issues.apache.org/jira/browse/HBASE-21228) | Memory leak since AbstractFSWAL caches Thread object and never clean later | Critical | wal |
| [HBASE-20766](https://issues.apache.org/jira/browse/HBASE-20766) | Verify Replication Tool Has Typo "remove cluster" | Trivial | . |
| [HBASE-21232](https://issues.apache.org/jira/browse/HBASE-21232) | Show table state in Tables view on Master home page | Major | Operability, UI |
| [HBASE-21212](https://issues.apache.org/jira/browse/HBASE-21212) | Wrong flush time when update flush metric | Minor | . |
| [HBASE-21208](https://issues.apache.org/jira/browse/HBASE-21208) | Bytes#toShort doesn't work without unsafe | Critical | . |
| [HBASE-20704](https://issues.apache.org/jira/browse/HBASE-20704) | Sometimes some compacted storefiles are not archived on region close | Critical | Compaction |
| [HBASE-21203](https://issues.apache.org/jira/browse/HBASE-21203) | TestZKMainServer#testCommandLineWorks won't pass with default 4lw whitelist | Minor | test, Zookeeper |
| [HBASE-21102](https://issues.apache.org/jira/browse/HBASE-21102) | ServerCrashProcedure should select target server where no other replicas exist for the current region | Major | Region Assignment |
| [HBASE-21206](https://issues.apache.org/jira/browse/HBASE-21206) | Scan with batch size may return incomplete cells | Critical | Scanners |
| [HBASE-21182](https://issues.apache.org/jira/browse/HBASE-21182) | Failed to execute start-hbase.sh | Major | . |
| [HBASE-21179](https://issues.apache.org/jira/browse/HBASE-21179) | Fix the number of actions in responseTooSlow log | Major | logging, rpc |
| [HBASE-21174](https://issues.apache.org/jira/browse/HBASE-21174) | [REST] Failed to parse empty qualifier in TableResource#getScanResource | Major | REST |
| [HBASE-21181](https://issues.apache.org/jira/browse/HBASE-21181) | Use the same filesystem for wal archive directory and wal directory | Major | . |
| [HBASE-21021](https://issues.apache.org/jira/browse/HBASE-21021) | Result returned by Append operation should be ordered | Major | . |
| [HBASE-21173](https://issues.apache.org/jira/browse/HBASE-21173) | Remove the duplicate HRegion#close in TestHRegion | Minor | test |
| [HBASE-21144](https://issues.apache.org/jira/browse/HBASE-21144) | AssignmentManager.waitForAssignment is not stable | Major | amv2, test |
| [HBASE-21143](https://issues.apache.org/jira/browse/HBASE-21143) | Update findbugs-maven-plugin to 3.0.4 | Major | pom |
| [HBASE-21171](https://issues.apache.org/jira/browse/HBASE-21171) | [amv2] Tool to parse a directory of MasterProcWALs standalone | Major | amv2, test |
| [HBASE-21052](https://issues.apache.org/jira/browse/HBASE-21052) | After restoring a snapshot, table.jsp page for the table gets stuck | Major | snapshots |
| [HBASE-21001](https://issues.apache.org/jira/browse/HBASE-21001) | ReplicationObserver fails to load in HBase 2.0.0 | Major | . |
| [HBASE-20741](https://issues.apache.org/jira/browse/HBASE-20741) | Split of a region with replicas creates all daughter regions and its replica in same server | Major | read replicas |
| [HBASE-21127](https://issues.apache.org/jira/browse/HBASE-21127) | TableRecordReader need to handle cursor result too | Major | . |
| [HBASE-20892](https://issues.apache.org/jira/browse/HBASE-20892) | [UI] Start / End keys are empty on table.jsp | Major | . |
| [HBASE-21136](https://issues.apache.org/jira/browse/HBASE-21136) | NPE in MetricsTableSourceImpl.updateFlushTime | Major | metrics |
| [HBASE-21132](https://issues.apache.org/jira/browse/HBASE-21132) | return wrong result in rest multiget | Major | . |
| [HBASE-21128](https://issues.apache.org/jira/browse/HBASE-21128) | TestAsyncRegionAdminApi.testAssignRegionAndUnassignRegion is broken | Major | test |
| [HBASE-20940](https://issues.apache.org/jira/browse/HBASE-20940) | HStore.cansplit should not allow split to happen if it has references | Major | . |
| [HBASE-21084](https://issues.apache.org/jira/browse/HBASE-21084) | When cloning a snapshot including a split parent region, the split parent region of the cloned table will be online | Major | snapshots |
| [HBASE-20968](https://issues.apache.org/jira/browse/HBASE-20968) | list\_procedures\_test fails due to no matching regex | Major | shell, test |
| [HBASE-21030](https://issues.apache.org/jira/browse/HBASE-21030) | Correct javadoc for append operation | Minor | documentation |
| [HBASE-21088](https://issues.apache.org/jira/browse/HBASE-21088) | HStoreFile should be closed in HStore#hasReferences | Major | . |
| [HBASE-20890](https://issues.apache.org/jira/browse/HBASE-20890) | PE filterScan seems to be stuck forever | Minor | . |
| [HBASE-20772](https://issues.apache.org/jira/browse/HBASE-20772) | Controlled shutdown fills Master log with the disturbing message "No matching procedure found for rit=OPEN, location=ZZZZ, table=YYYYY, region=XXXX transition to CLOSED | Major | logging |
| [HBASE-20978](https://issues.apache.org/jira/browse/HBASE-20978) | [amv2] Worker terminating UNNATURALLY during MoveRegionProcedure | Critical | amv2 |
| [HBASE-21078](https://issues.apache.org/jira/browse/HBASE-21078) | [amv2] CODE-BUG NPE in RTP doing Unassign | Major | amv2 |
| [HBASE-21113](https://issues.apache.org/jira/browse/HBASE-21113) | Apply the branch-2 version of HBASE-21095, The timeout retry logic for several procedures are broken after master restarts | Major | amv2 |
| [HBASE-21101](https://issues.apache.org/jira/browse/HBASE-21101) | Remove the waitUntilAllRegionsAssigned call after split in TestTruncateTableProcedure | Major | test |
| [HBASE-19008](https://issues.apache.org/jira/browse/HBASE-19008) | Add missing equals or hashCode method(s) to stock Filter implementations | Major | . |
| [HBASE-20614](https://issues.apache.org/jira/browse/HBASE-20614) | REST scan API with incorrect filter text file throws HTTP 503 Service Unavailable error | Minor | REST |
| [HBASE-21041](https://issues.apache.org/jira/browse/HBASE-21041) | Memstore's heap size will be decreased to minus zero after flush | Major | . |
| [HBASE-21031](https://issues.apache.org/jira/browse/HBASE-21031) | Memory leak if replay edits failed during region opening | Major | . |
| [HBASE-20666](https://issues.apache.org/jira/browse/HBASE-20666) | Unsuccessful table creation leaves entry in hbase:rsgroup table | Minor | . |
| [HBASE-21032](https://issues.apache.org/jira/browse/HBASE-21032) | ScanResponses contain only one cell each | Major | Performance, Scanners |
| [HBASE-20705](https://issues.apache.org/jira/browse/HBASE-20705) | Having RPC Quota on a table prevents Space quota to be recreated/removed | Major | . |
| [HBASE-21058](https://issues.apache.org/jira/browse/HBASE-21058) | Nightly tests for branches 1 fail to build ref guide | Major | documentation |
| [HBASE-21074](https://issues.apache.org/jira/browse/HBASE-21074) | JDK7 branches need to pass "-Dhttps.protocols=TLSv1.2" to maven when building | Major | build, community, test |
| [HBASE-21062](https://issues.apache.org/jira/browse/HBASE-21062) | WALFactory has misleading notion of "default" | Major | wal |
| [HBASE-21047](https://issues.apache.org/jira/browse/HBASE-21047) | Object creation of StoreFileScanner thru constructor and close may leave refCount to -1 | Major | . |
| [HBASE-21005](https://issues.apache.org/jira/browse/HBASE-21005) | Maven site configuration causes downstream projects to get a directory named ${project.basedir} | Minor | build |
| [HBASE-21007](https://issues.apache.org/jira/browse/HBASE-21007) | Memory leak in HBase rest server | Critical | REST |
| [HBASE-20794](https://issues.apache.org/jira/browse/HBASE-20794) | CreateTable operation does not log its landing at the master nor the initiator at INFO level | Major | logging |
| [HBASE-20538](https://issues.apache.org/jira/browse/HBASE-20538) | Upgrade our hadoop versions to 2.7.7 and 3.0.3 | Critical | java, security |
| [HBASE-20927](https://issues.apache.org/jira/browse/HBASE-20927) | RSGroupAdminEndpoint doesn't handle clearing dead servers if they are not processed yet. | Major | . |
| [HBASE-20932](https://issues.apache.org/jira/browse/HBASE-20932) | Effective MemStoreSize::hashCode() | Major | . |
| [HBASE-20928](https://issues.apache.org/jira/browse/HBASE-20928) | Rewrite calculation of midpoint in binarySearch functions to prevent overflow | Minor | io |
| [HBASE-20565](https://issues.apache.org/jira/browse/HBASE-20565) | ColumnRangeFilter combined with ColumnPaginationFilter can produce incorrect result since 1.4 | Major | Filters |
| [HBASE-20908](https://issues.apache.org/jira/browse/HBASE-20908) | Infinite loop on regionserver if region replica are reduced | Major | read replicas |
| [HBASE-19893](https://issues.apache.org/jira/browse/HBASE-19893) | restore\_snapshot is broken in master branch when region splits | Critical | snapshots |
| [HBASE-20870](https://issues.apache.org/jira/browse/HBASE-20870) | Wrong HBase root dir in ITBLL's Search Tool | Minor | integration tests |
| [HBASE-20901](https://issues.apache.org/jira/browse/HBASE-20901) | Reducing region replica has no effect | Major | . |
| [HBASE-6028](https://issues.apache.org/jira/browse/HBASE-6028) | Implement a cancel for in-progress compactions | Minor | regionserver |
| [HBASE-20869](https://issues.apache.org/jira/browse/HBASE-20869) | Endpoint-based Export use incorrect user to write to destination | Major | Coprocessors |
| [HBASE-20879](https://issues.apache.org/jira/browse/HBASE-20879) | Compacting memstore config should handle lower case | Major | . |
| [HBASE-20865](https://issues.apache.org/jira/browse/HBASE-20865) | CreateTableProcedure is stuck in retry loop in CREATE\_TABLE\_WRITE\_FS\_LAYOUT state | Major | amv2 |
| [HBASE-19572](https://issues.apache.org/jira/browse/HBASE-19572) | RegionMover should use the configured default port number and not the one from HConstants | Major | . |
| [HBASE-20697](https://issues.apache.org/jira/browse/HBASE-20697) | Can't cache All region locations of the specify table by calling table.getRegionLocator().getAllRegionLocations() | Major | meta |
| [HBASE-20791](https://issues.apache.org/jira/browse/HBASE-20791) | RSGroupBasedLoadBalancer#setClusterMetrics should pass ClusterMetrics to its internalBalancer | Major | Balancer, rsgroup |
| [HBASE-20770](https://issues.apache.org/jira/browse/HBASE-20770) | WAL cleaner logs way too much; gets clogged when lots of work to do | Critical | logging |
### TESTS:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-21963](https://issues.apache.org/jira/browse/HBASE-21963) | Add a script for building and verifying release candidate | Minor | community, scripts |
| [HBASE-21756](https://issues.apache.org/jira/browse/HBASE-21756) | Backport HBASE-21279 (Split TestAdminShell into several tests) to branch-2 | Major | . |
| [HBASE-20136](https://issues.apache.org/jira/browse/HBASE-20136) | TestKeyValue misses ClassRule and Category annotations | Minor | . |
| [HBASE-21261](https://issues.apache.org/jira/browse/HBASE-21261) | Add log4j.properties for hbase-rsgroup tests | Trivial | . |
| [HBASE-21258](https://issues.apache.org/jira/browse/HBASE-21258) | Add resetting of flags for RS Group pre/post hooks in TestRSGroups | Major | . |
| [HBASE-21097](https://issues.apache.org/jira/browse/HBASE-21097) | Flush pressure assertion may fail in testFlushThroughputTuning | Major | regionserver |
| [HBASE-21138](https://issues.apache.org/jira/browse/HBASE-21138) | Close HRegion instance at the end of every test in TestHRegion | Major | . |
| [HBASE-21161](https://issues.apache.org/jira/browse/HBASE-21161) | Enable the test added in HBASE-20741 that was removed accidentally | Minor | . |
| [HBASE-21076](https://issues.apache.org/jira/browse/HBASE-21076) | TestTableResource fails with NPE | Major | REST, test |
| [HBASE-20907](https://issues.apache.org/jira/browse/HBASE-20907) | Fix Intermittent failure on TestProcedurePriority | Major | . |
| [HBASE-20838](https://issues.apache.org/jira/browse/HBASE-20838) | Include hbase-server in precommit test if CommonFSUtils is changed | Major | . |
### SUB-TASKS:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-21970](https://issues.apache.org/jira/browse/HBASE-21970) | Document that how to upgrade from 2.0 or 2.1 to 2.2+ | Major | . |
| [HBASE-22357](https://issues.apache.org/jira/browse/HBASE-22357) | Fix remaining Checkstyle issues in hbase-replication | Trivial | Replication |
| [HBASE-22554](https://issues.apache.org/jira/browse/HBASE-22554) | Upgrade to surefire 2.22.2 | Major | test |
| [HBASE-22500](https://issues.apache.org/jira/browse/HBASE-22500) | Modify pom and jenkins jobs for hadoop versions | Blocker | build, hadoop2, hadoop3 |
| [HBASE-22316](https://issues.apache.org/jira/browse/HBASE-22316) | Record the stack trace for current thread in FutureUtils.get | Major | asyncclient, Client |
| [HBASE-22326](https://issues.apache.org/jira/browse/HBASE-22326) | Fix Checkstyle errors in hbase-examples | Minor | . |
| [HBASE-22327](https://issues.apache.org/jira/browse/HBASE-22327) | Fix remaining Checkstyle issues in hbase-hadoop-compat | Trivial | . |
| [HBASE-22478](https://issues.apache.org/jira/browse/HBASE-22478) | Add jackson dependency for hbase-http module | Major | build, dependencies |
| [HBASE-22445](https://issues.apache.org/jira/browse/HBASE-22445) | Add file info when throw exceptions in HFileReaderImpl | Major | . |
| [HBASE-22447](https://issues.apache.org/jira/browse/HBASE-22447) | Check refCount before free block in BucketCache | Major | BucketCache |
| [HBASE-22400](https://issues.apache.org/jira/browse/HBASE-22400) | Remove the adapter code in async fs implementation for hadoop-2.7.x | Major | wal |
| [HBASE-22430](https://issues.apache.org/jira/browse/HBASE-22430) | hbase-vote should tee build and test output to console | Trivial | . |
| [HBASE-22429](https://issues.apache.org/jira/browse/HBASE-22429) | hbase-vote download step requires URL to end with '/' | Trivial | . |
| [HBASE-22405](https://issues.apache.org/jira/browse/HBASE-22405) | Update Ref Guide for EOL of Hadoop 2.7 | Major | community, documentation |
| [HBASE-22325](https://issues.apache.org/jira/browse/HBASE-22325) | AsyncRpcRetryingCaller will not schedule retry if we hit a NotServingRegionException but there is no TableName provided | Major | asyncclient, Client |
| [HBASE-22322](https://issues.apache.org/jira/browse/HBASE-22322) | Use special pause for CallQueueTooBigException | Major | asyncclient, Client |
| [HBASE-22317](https://issues.apache.org/jira/browse/HBASE-22317) | Support reading from meta replicas | Major | asyncclient, read replicas |
| [HBASE-22261](https://issues.apache.org/jira/browse/HBASE-22261) | Make use of ClusterStatusListener for async client | Major | asyncclient |
| [HBASE-22267](https://issues.apache.org/jira/browse/HBASE-22267) | Implement client push back for async client | Major | asyncclient |
| [HBASE-19763](https://issues.apache.org/jira/browse/HBASE-19763) | Fix Checkstyle errors in hbase-procedure | Minor | . |
| [HBASE-22244](https://issues.apache.org/jira/browse/HBASE-22244) | Make use of MetricsConnection in async client | Major | asyncclient, metrics |
| [HBASE-22196](https://issues.apache.org/jira/browse/HBASE-22196) | Split TestRestartCluster | Major | test |
| [HBASE-22117](https://issues.apache.org/jira/browse/HBASE-22117) | Move hasPermission/checkPermissions from region server to master | Major | . |
| [HBASE-21886](https://issues.apache.org/jira/browse/HBASE-21886) | Run ITBLL for branch-2.2 | Major | . |
| [HBASE-22155](https://issues.apache.org/jira/browse/HBASE-22155) | Move 2.2.0 on to hbase-thirdparty-2.2.0 | Major | thirdparty |
| [HBASE-22153](https://issues.apache.org/jira/browse/HBASE-22153) | Fix the flaky TestRestartCluster | Major | test |
| [HBASE-22152](https://issues.apache.org/jira/browse/HBASE-22152) | Create a jenkins file for yetus to processing GitHub PR | Major | build |
| [HBASE-22158](https://issues.apache.org/jira/browse/HBASE-22158) | RawAsyncHBaseAdmin.getTableSplits should filter out none default replicas | Major | Admin |
| [HBASE-22157](https://issues.apache.org/jira/browse/HBASE-22157) | Include the cause when constructing RestoreSnapshotException in restoreSnapshot | Major | Admin |
| [HBASE-22141](https://issues.apache.org/jira/browse/HBASE-22141) | Fix TestAsyncDecommissionAdminApi | Major | test |
| [HBASE-22135](https://issues.apache.org/jira/browse/HBASE-22135) | AsyncAdmin will not refresh master address | Major | Admin, asyncclient, Client |
| [HBASE-22101](https://issues.apache.org/jira/browse/HBASE-22101) | AsyncAdmin.isTableAvailable should not throw TableNotFoundException | Major | Admin, asyncclient, Client |
| [HBASE-22094](https://issues.apache.org/jira/browse/HBASE-22094) | Throw TableNotFoundException if table not exists in AsyncAdmin.compact | Major | Admin |
| [HBASE-21911](https://issues.apache.org/jira/browse/HBASE-21911) | Move getUserPermissions from regionserver to master | Major | . |
| [HBASE-22015](https://issues.apache.org/jira/browse/HBASE-22015) | UserPermission should be annotated as InterfaceAudience.Public | Blocker | . |
| [HBASE-22066](https://issues.apache.org/jira/browse/HBASE-22066) | Add markers to CHANGES.md and RELEASENOTES.md | Major | . |
| [HBASE-22040](https://issues.apache.org/jira/browse/HBASE-22040) | Add mergeRegionsAsync with a List of region names method in AsyncAdmin | Major | Admin, asyncclient, Client |
| [HBASE-22039](https://issues.apache.org/jira/browse/HBASE-22039) | Should add the synchronous parameter for the XXXSwitch method in AsyncAdmin | Major | Admin, asyncclient, Client |
| [HBASE-22022](https://issues.apache.org/jira/browse/HBASE-22022) | nightly fails rat check down in the dev-support/hbase\_nightly\_source-artifact.sh check | Major | . |
| [HBASE-22025](https://issues.apache.org/jira/browse/HBASE-22025) | RAT check fails in nightlies; fails on (old) test data files. | Major | . |
| [HBASE-21977](https://issues.apache.org/jira/browse/HBASE-21977) | Skip replay WAL and update seqid when open regions restored from snapshot | Major | Region Assignment, snapshots |
| [HBASE-21999](https://issues.apache.org/jira/browse/HBASE-21999) | [DEBUG] Exit if git returns empty revision! | Major | build |
| [HBASE-22000](https://issues.apache.org/jira/browse/HBASE-22000) | Deprecated isTableAvailable with splitKeys | Major | asyncclient, Client |
| [HBASE-21949](https://issues.apache.org/jira/browse/HBASE-21949) | Fix flaky test TestHBaseTestingUtility.testMiniZooKeeperWithMultipleClientPorts | Major | . |
| [HBASE-21993](https://issues.apache.org/jira/browse/HBASE-21993) | Set version as 2.2.0 in branch-2.2 in prep for first RC | Major | . |
| [HBASE-21997](https://issues.apache.org/jira/browse/HBASE-21997) | Fix hbase-rest findbugs ST\_WRITE\_TO\_STATIC\_FROM\_INSTANCE\_METHOD complaint | Major | REST |
| [HBASE-21986](https://issues.apache.org/jira/browse/HBASE-21986) | Generate CHANGES.md and RELEASENOTES.md for 2.2.0 | Major | . |
| [HBASE-21972](https://issues.apache.org/jira/browse/HBASE-21972) | Copy master doc into branch-2.2 and edit to make it suit 2.2.0 | Major | . |
| [HBASE-15728](https://issues.apache.org/jira/browse/HBASE-15728) | Add remaining per-table region / store / flush / compaction related metrics | Major | metrics |
| [HBASE-21934](https://issues.apache.org/jira/browse/HBASE-21934) | RemoteProcedureDispatcher should track the ongoing dispatched calls | Blocker | proc-v2 |
| [HBASE-21588](https://issues.apache.org/jira/browse/HBASE-21588) | Procedure v2 wal splitting implementation | Major | . |
| [HBASE-21729](https://issues.apache.org/jira/browse/HBASE-21729) | Extract ProcedureCoordinatorRpcs and ProcedureMemberRpcs from CoordinatedStateManager | Major | . |
| [HBASE-21094](https://issues.apache.org/jira/browse/HBASE-21094) | Remove the explicit timeout config for TestTruncateTableProcedure | Major | test |
| [HBASE-21093](https://issues.apache.org/jira/browse/HBASE-21093) | Move TestCreateTableProcedure.testMRegions to a separated file | Major | test |
| [HBASE-18201](https://issues.apache.org/jira/browse/HBASE-18201) | add UT and docs for DataBlockEncodingTool | Minor | tooling |
| [HBASE-21978](https://issues.apache.org/jira/browse/HBASE-21978) | Should close AsyncRegistry if we fail to get cluster id when creating AsyncConnection | Major | asyncclient, Client |
| [HBASE-21974](https://issues.apache.org/jira/browse/HBASE-21974) | Change Admin#grant/revoke parameter from UserPermission to user and Permission | Major | . |
| [HBASE-21976](https://issues.apache.org/jira/browse/HBASE-21976) | Deal with RetryImmediatelyException for batching request | Major | asyncclient, Client |
| [HBASE-21820](https://issues.apache.org/jira/browse/HBASE-21820) | Implement CLUSTER quota scope | Major | . |
| [HBASE-21962](https://issues.apache.org/jira/browse/HBASE-21962) | Filters do not work in ThriftTable | Major | Thrift |
| [HBASE-21927](https://issues.apache.org/jira/browse/HBASE-21927) | Always fail the locate request when error occur | Major | asyncclient, Client |
| [HBASE-21944](https://issues.apache.org/jira/browse/HBASE-21944) | Validate put for batch operation | Major | asyncclient, Client |
| [HBASE-21945](https://issues.apache.org/jira/browse/HBASE-21945) | Maintain the original order when sending batch request | Major | asyncclient, Client |
| [HBASE-21783](https://issues.apache.org/jira/browse/HBASE-21783) | Support exceed user/table/ns throttle quota if region server has available quota | Major | . |
| [HBASE-21930](https://issues.apache.org/jira/browse/HBASE-21930) | Deal with ScannerResetException when opening region scanner | Major | asyncclient, Client |
| [HBASE-21907](https://issues.apache.org/jira/browse/HBASE-21907) | Should set priority for rpc request | Major | asyncclient, Client |
| [HBASE-21909](https://issues.apache.org/jira/browse/HBASE-21909) | Validate the put instance before executing in AsyncTable.put method | Major | asyncclient, Client |
| [HBASE-21814](https://issues.apache.org/jira/browse/HBASE-21814) | Remove the TODO in AccessControlLists#addUserPermission | Major | . |
| [HBASE-19889](https://issues.apache.org/jira/browse/HBASE-19889) | Revert Workaround: Purge User API building from branch-2 so can make a beta-1 | Major | website |
| [HBASE-21838](https://issues.apache.org/jira/browse/HBASE-21838) | Create a special ReplicationEndpoint just for verifying the WAL entries are fine | Major | Replication, wal |
| [HBASE-21829](https://issues.apache.org/jira/browse/HBASE-21829) | Use FutureUtils.addListener instead of calling whenComplete directly | Major | asyncclient, Client |
| [HBASE-21828](https://issues.apache.org/jira/browse/HBASE-21828) | Make sure we do not return CompletionException when locating region | Major | asyncclient, Client |
| [HBASE-21764](https://issues.apache.org/jira/browse/HBASE-21764) | Size of in-memory compaction thread pool should be configurable | Major | Compaction, in-memory-compaction |
| [HBASE-21809](https://issues.apache.org/jira/browse/HBASE-21809) | Add retry thrift client for ThriftTable/Admin | Major | . |
| [HBASE-21739](https://issues.apache.org/jira/browse/HBASE-21739) | Move grant/revoke from regionserver to master | Major | . |
| [HBASE-21798](https://issues.apache.org/jira/browse/HBASE-21798) | Cut branch-2.2 | Major | . |
| [HBASE-20542](https://issues.apache.org/jira/browse/HBASE-20542) | Better heap utilization for IMC with MSLABs | Major | in-memory-compaction |
| [HBASE-21713](https://issues.apache.org/jira/browse/HBASE-21713) | Support set region server throttle quota | Major | . |
| [HBASE-21761](https://issues.apache.org/jira/browse/HBASE-21761) | Align the methods in RegionLocator and AsyncTableRegionLocator | Major | asyncclient, Client |
| [HBASE-17370](https://issues.apache.org/jira/browse/HBASE-17370) | Fix or provide shell scripts to drain and decommission region server | Major | . |
| [HBASE-21750](https://issues.apache.org/jira/browse/HBASE-21750) | Most of KeyValueUtil#length can be replaced by cell#getSerializedSize for better performance because the latter one has been optimized | Major | . |
| [HBASE-21734](https://issues.apache.org/jira/browse/HBASE-21734) | Some optimization in FilterListWithOR | Major | . |
| [HBASE-21738](https://issues.apache.org/jira/browse/HBASE-21738) | Remove all the CSLM#size operation in our memstore because it's an quite time consuming. | Critical | Performance |
| [HBASE-21034](https://issues.apache.org/jira/browse/HBASE-21034) | Add new throttle type: read/write capacity unit | Major | . |
| [HBASE-21726](https://issues.apache.org/jira/browse/HBASE-21726) | Add getAllRegionLocations method to AsyncTableRegionLocator | Major | asyncclient, Client |
| [HBASE-19695](https://issues.apache.org/jira/browse/HBASE-19695) | Handle disabled table for async client | Major | asyncclient, Client |
| [HBASE-21711](https://issues.apache.org/jira/browse/HBASE-21711) | Remove references to git.apache.org/hbase.git | Critical | . |
| [HBASE-21647](https://issues.apache.org/jira/browse/HBASE-21647) | Add status track for splitting WAL tasks | Major | Operability |
| [HBASE-21705](https://issues.apache.org/jira/browse/HBASE-21705) | Should treat meta table specially for some methods in AsyncAdmin | Major | Admin, asyncclient, Client |
| [HBASE-21663](https://issues.apache.org/jira/browse/HBASE-21663) | Add replica scan support | Major | asyncclient, Client, read replicas |
| [HBASE-21580](https://issues.apache.org/jira/browse/HBASE-21580) | Support getting Hbck instance from AsyncConnection | Major | asyncclient, Client, hbck2 |
| [HBASE-21652](https://issues.apache.org/jira/browse/HBASE-21652) | Refactor ThriftServer making thrift2 server inherited from thrift1 server | Major | . |
| [HBASE-21661](https://issues.apache.org/jira/browse/HBASE-21661) | Provide Thrift2 implementation of Table/Admin | Major | . |
| [HBASE-21682](https://issues.apache.org/jira/browse/HBASE-21682) | Support getting from specific replica | Major | read replicas |
| [HBASE-21159](https://issues.apache.org/jira/browse/HBASE-21159) | Add shell command to switch throttle on or off | Major | . |
| [HBASE-21362](https://issues.apache.org/jira/browse/HBASE-21362) | Disable printing of stack-trace in shell when quotas are violated | Minor | shell |
| [HBASE-21361](https://issues.apache.org/jira/browse/HBASE-21361) | Disable printing of stack-trace in shell when quotas are not enabled | Minor | shell |
| [HBASE-17356](https://issues.apache.org/jira/browse/HBASE-17356) | Add replica get support | Major | Client |
| [HBASE-21650](https://issues.apache.org/jira/browse/HBASE-21650) | Add DDL operation and some other miscellaneous to thrift2 | Major | Thrift |
| [HBASE-21401](https://issues.apache.org/jira/browse/HBASE-21401) | Sanity check when constructing the KeyValue | Critical | regionserver |
| [HBASE-21578](https://issues.apache.org/jira/browse/HBASE-21578) | Fix wrong throttling exception for capacity unit | Major | . |
| [HBASE-21570](https://issues.apache.org/jira/browse/HBASE-21570) | Add write buffer periodic flush support for AsyncBufferedMutator | Major | asyncclient, Client |
| [HBASE-21465](https://issues.apache.org/jira/browse/HBASE-21465) | Retry on reportRegionStateTransition can lead to unexpected errors | Major | amv2 |
| [HBASE-21508](https://issues.apache.org/jira/browse/HBASE-21508) | Ignore the reportRegionStateTransition call from a dead server | Major | amv2 |
| [HBASE-21490](https://issues.apache.org/jira/browse/HBASE-21490) | WALProcedure may remove proc wal files still with active procedures | Major | proc-v2 |
| [HBASE-21377](https://issues.apache.org/jira/browse/HBASE-21377) | Add debug log for procedure stack id related operations | Major | proc-v2 |
| [HBASE-21472](https://issues.apache.org/jira/browse/HBASE-21472) | Should not persist the dispatched field for RegionRemoteProcedureBase | Major | amv2 |
| [HBASE-21473](https://issues.apache.org/jira/browse/HBASE-21473) | RowIndexSeekerV1 may return cell with extra two \\x00\\x00 bytes which has no tags | Major | . |
| [HBASE-21463](https://issues.apache.org/jira/browse/HBASE-21463) | The checkOnlineRegionsReport can accidentally complete a TRSP | Critical | amv2 |
| [HBASE-21376](https://issues.apache.org/jira/browse/HBASE-21376) | Add some verbose log to MasterProcedureScheduler | Major | logging, proc-v2 |
| [HBASE-21443](https://issues.apache.org/jira/browse/HBASE-21443) | [hbase-connectors] Purge hbase-\* modules from core now they've been moved to hbase-connectors | Major | hbase-connectors, spark |
| [HBASE-21421](https://issues.apache.org/jira/browse/HBASE-21421) | Do not kill RS if reportOnlineRegions fails | Major | . |
| [HBASE-21314](https://issues.apache.org/jira/browse/HBASE-21314) | The implementation of BitSetNode is not efficient | Major | proc-v2 |
| [HBASE-21351](https://issues.apache.org/jira/browse/HBASE-21351) | The force update thread may have race with PE worker when the procedure is rolling back | Critical | proc-v2 |
| [HBASE-21191](https://issues.apache.org/jira/browse/HBASE-21191) | Add a holding-pattern if no assign for meta or namespace (Can happen if masterprocwals have been cleared). | Major | amv2 |
| [HBASE-21322](https://issues.apache.org/jira/browse/HBASE-21322) | Add a scheduleServerCrashProcedure() API to HbckService | Critical | hbck2 |
| [HBASE-21375](https://issues.apache.org/jira/browse/HBASE-21375) | Revisit the lock and queue implementation in MasterProcedureScheduler | Major | proc-v2 |
| [HBASE-20973](https://issues.apache.org/jira/browse/HBASE-20973) | ArrayIndexOutOfBoundsException when rolling back procedure | Critical | amv2 |
| [HBASE-21384](https://issues.apache.org/jira/browse/HBASE-21384) | Procedure with holdlock=false should not be restored lock when restarts | Blocker | . |
| [HBASE-21364](https://issues.apache.org/jira/browse/HBASE-21364) | Procedure holds the lock should put to front of the queue after restart | Blocker | . |
| [HBASE-21215](https://issues.apache.org/jira/browse/HBASE-21215) | Figure how to invoke hbck2; make it easy to find | Major | amv2, hbck2 |
| [HBASE-21372](https://issues.apache.org/jira/browse/HBASE-21372) | Set hbase.assignment.maximum.attempts to Long.MAX | Major | amv2 |
| [HBASE-21363](https://issues.apache.org/jira/browse/HBASE-21363) | Rewrite the buildingHoldCleanupTracker method in WALProcedureStore | Major | proc-v2 |
| [HBASE-21338](https://issues.apache.org/jira/browse/HBASE-21338) | [balancer] If balancer is an ill-fit for cluster size, it gives little indication | Major | Balancer, Operability |
| [HBASE-21192](https://issues.apache.org/jira/browse/HBASE-21192) | Add HOW-TO repair damaged AMv2. | Major | amv2 |
| [HBASE-21073](https://issues.apache.org/jira/browse/HBASE-21073) | "Maintenance mode" master | Major | amv2, hbck2, master |
| [HBASE-21354](https://issues.apache.org/jira/browse/HBASE-21354) | Procedure may be deleted improperly during master restarts resulting in 'Corrupt' | Major | . |
| [HBASE-21336](https://issues.apache.org/jira/browse/HBASE-21336) | Simplify the implementation of WALProcedureMap | Major | proc-v2 |
| [HBASE-21323](https://issues.apache.org/jira/browse/HBASE-21323) | Should not skip force updating for a sub procedure even if it has been finished | Major | proc-v2 |
| [HBASE-21269](https://issues.apache.org/jira/browse/HBASE-21269) | Forward-port to branch-2 " HBASE-21213 [hbck2] bypass leaves behind state in RegionStates when assign/unassign" | Major | amv2 |
| [HBASE-20716](https://issues.apache.org/jira/browse/HBASE-20716) | Unsafe access cleanup | Critical | Performance |
| [HBASE-21330](https://issues.apache.org/jira/browse/HBASE-21330) | ReopenTableRegionsProcedure will enter an infinite loop if we schedule a TRSP at the same time | Major | amv2 |
| [HBASE-21310](https://issues.apache.org/jira/browse/HBASE-21310) | Split TestCloneSnapshotFromClient | Major | test |
| [HBASE-21311](https://issues.apache.org/jira/browse/HBASE-21311) | Split TestRestoreSnapshotFromClient | Major | test |
| [HBASE-21315](https://issues.apache.org/jira/browse/HBASE-21315) | The getActiveMinProcId and getActiveMaxProcId of BitSetNode are incorrect if there are no active procedure | Major | . |
| [HBASE-21278](https://issues.apache.org/jira/browse/HBASE-21278) | Do not rollback successful sub procedures when rolling back a procedure | Critical | proc-v2 |
| [HBASE-21309](https://issues.apache.org/jira/browse/HBASE-21309) | Increase the waiting timeout for TestProcedurePriority | Major | test |
| [HBASE-21254](https://issues.apache.org/jira/browse/HBASE-21254) | Need to find a way to limit the number of proc wal files | Critical | proc-v2 |
| [HBASE-21250](https://issues.apache.org/jira/browse/HBASE-21250) | Refactor WALProcedureStore and add more comments for better understanding the implementation | Major | proc-v2 |
| [HBASE-19275](https://issues.apache.org/jira/browse/HBASE-19275) | TestSnapshotFileCache never worked properly | Major | . |
| [HBASE-21249](https://issues.apache.org/jira/browse/HBASE-21249) | Add jitter for ProcedureUtil.getBackoffTimeMs | Major | proc-v2 |
| [HBASE-21244](https://issues.apache.org/jira/browse/HBASE-21244) | Skip persistence when retrying for assignment related procedures | Major | amv2, Performance, proc-v2 |
| [HBASE-21233](https://issues.apache.org/jira/browse/HBASE-21233) | Allow the procedure implementation to skip persistence of the state after a execution | Major | Performance, proc-v2 |
| [HBASE-21227](https://issues.apache.org/jira/browse/HBASE-21227) | Implement exponential retrying backoff for Assign/UnassignRegionHandler introduced in HBASE-21217 | Major | amv2, regionserver |
| [HBASE-21217](https://issues.apache.org/jira/browse/HBASE-21217) | Revisit the executeProcedure method for open/close region | Critical | amv2, proc-v2 |
| [HBASE-21214](https://issues.apache.org/jira/browse/HBASE-21214) | [hbck2] setTableState just sets hbase:meta state, not in-memory state | Major | amv2, hbck2 |
| [HBASE-21023](https://issues.apache.org/jira/browse/HBASE-21023) | Add bypassProcedureToCompletion() API to HbckService | Major | hbck2 |
| [HBASE-21156](https://issues.apache.org/jira/browse/HBASE-21156) | [hbck2] Queue an assign of hbase:meta and bulk assign/unassign | Critical | hbck2 |
| [HBASE-21169](https://issues.apache.org/jira/browse/HBASE-21169) | Initiate hbck2 tool in hbase-operator-tools repo | Major | hbck2 |
| [HBASE-21172](https://issues.apache.org/jira/browse/HBASE-21172) | Reimplement the retry backoff logic for ReopenTableRegionsProcedure | Major | amv2, proc-v2 |
| [HBASE-21189](https://issues.apache.org/jira/browse/HBASE-21189) | flaky job should gather machine stats | Minor | test |
| [HBASE-21190](https://issues.apache.org/jira/browse/HBASE-21190) | Log files and count of entries in each as we load from the MasterProcWAL store | Major | amv2 |
| [HBASE-21083](https://issues.apache.org/jira/browse/HBASE-21083) | Introduce a mechanism to bypass the execution of a stuck procedure | Major | amv2 |
| [HBASE-21017](https://issues.apache.org/jira/browse/HBASE-21017) | Revisit the expected states for open/close | Major | amv2 |
| [HBASE-20941](https://issues.apache.org/jira/browse/HBASE-20941) | Create and implement HbckService in master | Major | . |
| [HBASE-21072](https://issues.apache.org/jira/browse/HBASE-21072) | Block out HBCK1 in hbase2 | Major | hbck |
| [HBASE-21095](https://issues.apache.org/jira/browse/HBASE-21095) | The timeout retry logic for several procedures are broken after master restarts | Critical | amv2, proc-v2 |
| [HBASE-20975](https://issues.apache.org/jira/browse/HBASE-20975) | Lock may not be taken or released while rolling back procedure | Major | amv2 |
| [HBASE-21025](https://issues.apache.org/jira/browse/HBASE-21025) | Add cache for TableStateManager | Major | . |
| [HBASE-21012](https://issues.apache.org/jira/browse/HBASE-21012) | Revert the change of serializing TimeRangeTracker | Critical | . |
| [HBASE-20813](https://issues.apache.org/jira/browse/HBASE-20813) | Remove RPC quotas when the associated table/Namespace is dropped off | Minor | . |
| [HBASE-20885](https://issues.apache.org/jira/browse/HBASE-20885) | Remove entry for RPC quota from hbase:quota when RPC quota is removed. | Minor | . |
| [HBASE-20893](https://issues.apache.org/jira/browse/HBASE-20893) | Data loss if splitting region while ServerCrashProcedure executing | Major | . |
| [HBASE-20950](https://issues.apache.org/jira/browse/HBASE-20950) | Helper method to configure secure DFS cluster for tests | Major | test |
| [HBASE-19369](https://issues.apache.org/jira/browse/HBASE-19369) | HBase Should use Builder Pattern to Create Log Files while using WAL on Erasure Coding | Major | . |
| [HBASE-20939](https://issues.apache.org/jira/browse/HBASE-20939) | There will be race when we call suspendIfNotReady and then throw ProcedureSuspendedException | Critical | amv2 |
| [HBASE-20921](https://issues.apache.org/jira/browse/HBASE-20921) | Possible NPE in ReopenTableRegionsProcedure | Major | amv2 |
| [HBASE-20867](https://issues.apache.org/jira/browse/HBASE-20867) | RS may get killed while master restarts | Major | . |
| [HBASE-20878](https://issues.apache.org/jira/browse/HBASE-20878) | Data loss if merging regions while ServerCrashProcedure executing | Critical | amv2 |
| [HBASE-20846](https://issues.apache.org/jira/browse/HBASE-20846) | Restore procedure locks when master restarts | Major | . |
| [HBASE-20914](https://issues.apache.org/jira/browse/HBASE-20914) | Trim Master memory usage | Major | Balancer, master |
| [HBASE-20853](https://issues.apache.org/jira/browse/HBASE-20853) | Polish "Add defaults to Table Interface so Implementors don't have to" | Major | API |
| [HBASE-20875](https://issues.apache.org/jira/browse/HBASE-20875) | MemStoreLABImp::copyIntoCell uses 7% CPU when writing | Major | Performance |
| [HBASE-20860](https://issues.apache.org/jira/browse/HBASE-20860) | Merged region's RIT state may not be cleaned after master restart | Major | . |
| [HBASE-20847](https://issues.apache.org/jira/browse/HBASE-20847) | The parent procedure of RegionTransitionProcedure may not have the table lock | Major | proc-v2, Region Assignment |
| [HBASE-20776](https://issues.apache.org/jira/browse/HBASE-20776) | Update branch-2 version to 2.2.0-SNAPSHOT | Major | build |
### OTHER:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-21612](https://issues.apache.org/jira/browse/HBASE-21612) | Add developer debug options in HBase Config for REST server | Minor | Operability, REST, scripts |
| [HBASE-18735](https://issues.apache.org/jira/browse/HBASE-18735) | Provide a fast mechanism for shutting down mini cluster | Major | . |
| [HBASE-21489](https://issues.apache.org/jira/browse/HBASE-21489) | TestShell is broken | Major | shell |
| [HBASE-20152](https://issues.apache.org/jira/browse/HBASE-20152) | [AMv2] DisableTableProcedure versus ServerCrashProcedure | Major | amv2 |
| [HBASE-20540](https://issues.apache.org/jira/browse/HBASE-20540) | [umbrella] Hadoop 3 compatibility | Major | . |
| [HBASE-21536](https://issues.apache.org/jira/browse/HBASE-21536) | Fix completebulkload usage instructions | Trivial | documentation, mapreduce |
| [HBASE-22449](https://issues.apache.org/jira/browse/HBASE-22449) | https everywhere in Maven metadata | Minor | . |
| [HBASE-22406](https://issues.apache.org/jira/browse/HBASE-22406) | skip generating rdoc when building gems in our docker image for running yetus | Critical | build, test |
| [HBASE-22375](https://issues.apache.org/jira/browse/HBASE-22375) | Promote AccessChecker to LimitedPrivate(Coprocessor) | Minor | Coprocessors, security |
| [HBASE-21714](https://issues.apache.org/jira/browse/HBASE-21714) | Deprecated isTableAvailableWithSplit method in thrift module | Major | Thrift |
| [HBASE-22359](https://issues.apache.org/jira/browse/HBASE-22359) | Backport of HBASE-21371 misses activation-api license information | Minor | build, community |
| [HBASE-22174](https://issues.apache.org/jira/browse/HBASE-22174) | Remove error prone from our precommit javac check | Major | build |
| [HBASE-22231](https://issues.apache.org/jira/browse/HBASE-22231) | Remove unused and \* imports | Minor | . |
| [HBASE-22304](https://issues.apache.org/jira/browse/HBASE-22304) | Fix remaining Checkstyle issues in hbase-endpoint | Trivial | . |
| [HBASE-22020](https://issues.apache.org/jira/browse/HBASE-22020) | upgrade to yetus 0.9.0 | Major | build, community |
| [HBASE-22187](https://issues.apache.org/jira/browse/HBASE-22187) | Remove usage of deprecated ClusterConnection.clearRegionCache | Trivial | Client |
| [HBASE-22203](https://issues.apache.org/jira/browse/HBASE-22203) | Reformat DemoClient.java | Trivial | . |
| [HBASE-22189](https://issues.apache.org/jira/browse/HBASE-22189) | Remove usage of StoreFile.getModificationTimeStamp | Trivial | . |
| [HBASE-22108](https://issues.apache.org/jira/browse/HBASE-22108) | Avoid passing null in Admin methods | Major | Admin |
| [HBASE-22007](https://issues.apache.org/jira/browse/HBASE-22007) | Add restoreSnapshot and cloneSnapshot with acl methods in AsyncAdmin | Major | Admin, asyncclient, Client |
| [HBASE-22131](https://issues.apache.org/jira/browse/HBASE-22131) | Delete the patches in hbase-protocol-shaded module | Major | build, Protobufs |
| [HBASE-22099](https://issues.apache.org/jira/browse/HBASE-22099) | Backport HBASE-21895 "Error prone upgrade" to branch-2 | Major | build |
| [HBASE-22052](https://issues.apache.org/jira/browse/HBASE-22052) | pom cleaning; filter out jersey-core in hadoop2 to match hadoop3 and remove redunant version specifications | Major | . |
| [HBASE-22065](https://issues.apache.org/jira/browse/HBASE-22065) | Add listTableDescriptors(List\<TableName\>) method in AsyncAdmin | Major | Admin |
| [HBASE-22042](https://issues.apache.org/jira/browse/HBASE-22042) | Missing @Override annotation for RawAsyncTableImpl.scan | Major | asyncclient, Client |
| [HBASE-21057](https://issues.apache.org/jira/browse/HBASE-21057) | upgrade to latest spotbugs | Minor | community, test |
| [HBASE-21888](https://issues.apache.org/jira/browse/HBASE-21888) | Add a isClosed method to AsyncConnection | Major | asyncclient, Client |
| [HBASE-21884](https://issues.apache.org/jira/browse/HBASE-21884) | Fix box/unbox findbugs warning in secure bulk load | Minor | . |
| [HBASE-21859](https://issues.apache.org/jira/browse/HBASE-21859) | Add clearRegionLocationCache method for AsyncConnection | Major | asyncclient, Client |
| [HBASE-21853](https://issues.apache.org/jira/browse/HBASE-21853) | update copyright notices to 2019 | Major | documentation |
| [HBASE-21791](https://issues.apache.org/jira/browse/HBASE-21791) | Upgrade thrift dependency to 0.12.0 | Blocker | Thrift |
| [HBASE-21710](https://issues.apache.org/jira/browse/HBASE-21710) | Add quota related methods to the Admin interface | Major | . |
| [HBASE-21782](https://issues.apache.org/jira/browse/HBASE-21782) | LoadIncrementalHFiles should not be IA.Public | Major | mapreduce |
| [HBASE-21762](https://issues.apache.org/jira/browse/HBASE-21762) | Move some methods in ClusterConnection to Connection | Major | Client |
| [HBASE-21715](https://issues.apache.org/jira/browse/HBASE-21715) | Do not throw UnsupportedOperationException in ProcedureFuture.get | Major | Client |
| [HBASE-21716](https://issues.apache.org/jira/browse/HBASE-21716) | Add toStringCustomizedValues to TableDescriptor | Major | . |
| [HBASE-21731](https://issues.apache.org/jira/browse/HBASE-21731) | Do not need to use ClusterConnection in IntegrationTestBigLinkedListWithVisibility | Major | . |
| [HBASE-21685](https://issues.apache.org/jira/browse/HBASE-21685) | Change repository urls to Gitbox | Critical | . |
| [HBASE-21534](https://issues.apache.org/jira/browse/HBASE-21534) | TestAssignmentManager is flakey | Major | test |
| [HBASE-21541](https://issues.apache.org/jira/browse/HBASE-21541) | Move MetaTableLocator.verifyRegionLocation to hbase-rsgroup module | Major | . |
| [HBASE-21265](https://issues.apache.org/jira/browse/HBASE-21265) | Split up TestRSGroups | Minor | rsgroup, test |
| [HBASE-21517](https://issues.apache.org/jira/browse/HBASE-21517) | Move the getTableRegionForRow method from HMaster to TestMaster | Major | test |
| [HBASE-21281](https://issues.apache.org/jira/browse/HBASE-21281) | Update bouncycastle dependency. | Major | dependencies, test |
| [HBASE-21198](https://issues.apache.org/jira/browse/HBASE-21198) | Exclude dependency on net.minidev:json-smart | Major | . |
| [HBASE-21282](https://issues.apache.org/jira/browse/HBASE-21282) | Upgrade to latest jetty 9.2 and 9.3 versions | Major | dependencies |
| [HBASE-21287](https://issues.apache.org/jira/browse/HBASE-21287) | JVMClusterUtil Master initialization wait time not configurable | Major | test |
| [HBASE-21168](https://issues.apache.org/jira/browse/HBASE-21168) | BloomFilterUtil uses hardcoded randomness | Trivial | . |
| [HBASE-20482](https://issues.apache.org/jira/browse/HBASE-20482) | Print a link to the ref guide chapter for the shell during startup | Minor | documentation, shell |
| [HBASE-20942](https://issues.apache.org/jira/browse/HBASE-20942) | Improve RpcServer TRACE logging | Major | Operability |
| [HBASE-20989](https://issues.apache.org/jira/browse/HBASE-20989) | Minor, miscellaneous logging fixes | Trivial | logging |
## Release 2.1.0 - Unreleased (as of 2018-07-10)
### INCOMPATIBLE CHANGES:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-20691](https://issues.apache.org/jira/browse/HBASE-20691) | Storage policy should allow deferring to HDFS | Blocker | Filesystem Integration, wal |
| [HBASE-20270](https://issues.apache.org/jira/browse/HBASE-20270) | Turn off command help that follows all errors in shell | Major | shell |
| [HBASE-20501](https://issues.apache.org/jira/browse/HBASE-20501) | Change the Hadoop minimum version to 2.7.1 | Blocker | community, documentation |
| [HBASE-20406](https://issues.apache.org/jira/browse/HBASE-20406) | HBase Thrift HTTP - Shouldn't handle TRACE/OPTIONS methods | Major | security, Thrift |
| [HBASE-20159](https://issues.apache.org/jira/browse/HBASE-20159) | Support using separate ZK quorums for client | Major | Client, Operability, Zookeeper |
| [HBASE-20148](https://issues.apache.org/jira/browse/HBASE-20148) | Make serial replication as a option for a peer instead of a table | Major | Replication |
### NEW FEATURES:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-20833](https://issues.apache.org/jira/browse/HBASE-20833) | Modify pre-upgrade coprocessor validator to support table level coprocessors | Major | Coprocessors |
| [HBASE-15809](https://issues.apache.org/jira/browse/HBASE-15809) | Basic Replication WebUI | Critical | Replication, UI |
| [HBASE-19735](https://issues.apache.org/jira/browse/HBASE-19735) | Create a minimal "client" tarball installation | Major | build, Client |
| [HBASE-20656](https://issues.apache.org/jira/browse/HBASE-20656) | Validate pre-2.0 coprocessors against HBase 2.0+ | Major | tooling |
| [HBASE-20592](https://issues.apache.org/jira/browse/HBASE-20592) | Create a tool to verify tables do not have prefix tree encoding | Minor | Operability, tooling |
| [HBASE-20046](https://issues.apache.org/jira/browse/HBASE-20046) | Reconsider the implementation for serial replication | Major | Replication |
| [HBASE-19397](https://issues.apache.org/jira/browse/HBASE-19397) | Design procedures for ReplicationManager to notify peer change event from master | Major | proc-v2, Replication |
### IMPROVEMENTS:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-20806](https://issues.apache.org/jira/browse/HBASE-20806) | Split style journal for flushes and compactions | Minor | . |
| [HBASE-20474](https://issues.apache.org/jira/browse/HBASE-20474) | Show non-RPC tasks on master/regionserver Web UI by default | Major | UI |
| [HBASE-20826](https://issues.apache.org/jira/browse/HBASE-20826) | Truncate responseInfo attributes on RpcServer WARN messages | Major | rpc |
| [HBASE-20450](https://issues.apache.org/jira/browse/HBASE-20450) | Provide metrics for number of total active, priority and replication rpc handlers | Major | metrics |
| [HBASE-20810](https://issues.apache.org/jira/browse/HBASE-20810) | Include the procedure id in the exception message in HBaseAdmin for better debugging | Major | Admin, proc-v2 |
| [HBASE-20040](https://issues.apache.org/jira/browse/HBASE-20040) | Master UI should include "Cluster Key" needed to use the cluster as a replication sink | Minor | Replication, Usability |
| [HBASE-20095](https://issues.apache.org/jira/browse/HBASE-20095) | Redesign single instance pool in CleanerChore | Critical | . |
| [HBASE-19164](https://issues.apache.org/jira/browse/HBASE-19164) | Avoid UUID.randomUUID in tests | Major | test |
| [HBASE-20739](https://issues.apache.org/jira/browse/HBASE-20739) | Add priority for SCP | Major | Recovery |
| [HBASE-20737](https://issues.apache.org/jira/browse/HBASE-20737) | put collection into ArrayList instead of addAll function | Trivial | . |
| [HBASE-20695](https://issues.apache.org/jira/browse/HBASE-20695) | Implement table level RegionServer replication metrics | Minor | metrics |
| [HBASE-20733](https://issues.apache.org/jira/browse/HBASE-20733) | QABot should run checkstyle tests if the checkstyle configs change | Minor | build, community |
| [HBASE-20625](https://issues.apache.org/jira/browse/HBASE-20625) | refactor some WALCellCodec related code | Minor | wal |
| [HBASE-19852](https://issues.apache.org/jira/browse/HBASE-19852) | HBase Thrift 1 server SPNEGO Improvements | Major | Thrift |
| [HBASE-20579](https://issues.apache.org/jira/browse/HBASE-20579) | Improve snapshot manifest copy in ExportSnapshot | Minor | mapreduce |
| [HBASE-20444](https://issues.apache.org/jira/browse/HBASE-20444) | Improve version comparison logic for HBase specific version string and add unit tests | Major | util |
| [HBASE-20594](https://issues.apache.org/jira/browse/HBASE-20594) | provide utility to compare old and new descriptors | Major | . |
| [HBASE-20640](https://issues.apache.org/jira/browse/HBASE-20640) | TestQuotaGlobalsSettingsBypass missing test category and ClassRule | Critical | test |
| [HBASE-20478](https://issues.apache.org/jira/browse/HBASE-20478) | move import checks from hbaseanti to checkstyle | Minor | test |
| [HBASE-20548](https://issues.apache.org/jira/browse/HBASE-20548) | Master fails to startup on large clusters, refreshing block distribution | Major | . |
| [HBASE-20488](https://issues.apache.org/jira/browse/HBASE-20488) | PE tool prints full name in help message | Minor | shell |
| [HBASE-20567](https://issues.apache.org/jira/browse/HBASE-20567) | Pass both old and new descriptors to pre/post hooks of modify operations for table and namespace | Major | . |
| [HBASE-20545](https://issues.apache.org/jira/browse/HBASE-20545) | Improve performance of BaseLoadBalancer.retainAssignment | Major | Balancer |
| [HBASE-16191](https://issues.apache.org/jira/browse/HBASE-16191) | Add stop\_regionserver and stop\_master to shell | Major | . |
| [HBASE-20536](https://issues.apache.org/jira/browse/HBASE-20536) | Make TestRegionServerAccounting stable and it should not use absolute number | Minor | . |
| [HBASE-20523](https://issues.apache.org/jira/browse/HBASE-20523) | PE tool should support configuring client side buffering sizes | Minor | . |
| [HBASE-20527](https://issues.apache.org/jira/browse/HBASE-20527) | Remove unused code in MetaTableAccessor | Trivial | . |
| [HBASE-20507](https://issues.apache.org/jira/browse/HBASE-20507) | Do not need to call recoverLease on the broken file when we fail to create a wal writer | Major | wal |
| [HBASE-20484](https://issues.apache.org/jira/browse/HBASE-20484) | Remove the unnecessary autoboxing in FilterListBase | Trivial | . |
| [HBASE-20327](https://issues.apache.org/jira/browse/HBASE-20327) | When qualifier is not specified, append and incr operation do not work (shell) | Minor | shell |
| [HBASE-20389](https://issues.apache.org/jira/browse/HBASE-20389) | Move website building flags into a profile | Minor | build, website |
| [HBASE-20379](https://issues.apache.org/jira/browse/HBASE-20379) | shadedjars yetus plugin should add a footer link | Major | test |
| [HBASE-20243](https://issues.apache.org/jira/browse/HBASE-20243) | [Shell] Add shell command to create a new table by cloning the existent table | Minor | shell |
| [HBASE-20286](https://issues.apache.org/jira/browse/HBASE-20286) | Improving shell command compaction\_state | Minor | shell |
| [HBASE-19488](https://issues.apache.org/jira/browse/HBASE-19488) | Move to using Apache commons CollectionUtils | Trivial | . |
| [HBASE-20197](https://issues.apache.org/jira/browse/HBASE-20197) | Review of ByteBufferWriterOutputStream.java | Minor | . |
| [HBASE-20047](https://issues.apache.org/jira/browse/HBASE-20047) | AuthenticationTokenIdentifier should provide a toString | Minor | Usability |
| [HBASE-19024](https://issues.apache.org/jira/browse/HBASE-19024) | Configurable default durability for synchronous WAL | Critical | wal |
| [HBASE-19389](https://issues.apache.org/jira/browse/HBASE-19389) | Limit concurrency of put with dense (hundreds) columns to prevent write handler exhausted | Critical | Performance |
| [HBASE-20186](https://issues.apache.org/jira/browse/HBASE-20186) | Improve RSGroupBasedLoadBalancer#balanceCluster() to be more efficient when calculating cluster state for each rsgroup | Minor | rsgroup |
| [HBASE-19449](https://issues.apache.org/jira/browse/HBASE-19449) | Minor logging change in HFileArchiver | Trivial | . |
| [HBASE-20120](https://issues.apache.org/jira/browse/HBASE-20120) | Remove some unused classes/ java files from hbase-server | Minor | . |
### BUG FIXES:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-20854](https://issues.apache.org/jira/browse/HBASE-20854) | Wrong retries number in RpcRetryingCaller's log message | Minor | Client, logging |
| [HBASE-20784](https://issues.apache.org/jira/browse/HBASE-20784) | Will lose the SNAPSHOT suffix if we get the version of RS from ServerManager | Minor | master, UI |
| [HBASE-20822](https://issues.apache.org/jira/browse/HBASE-20822) | TestAsyncNonMetaRegionLocator is flakey | Major | asyncclient |
| [HBASE-20808](https://issues.apache.org/jira/browse/HBASE-20808) | Wrong shutdown order between Chores and ChoreService | Minor | . |
| [HBASE-20789](https://issues.apache.org/jira/browse/HBASE-20789) | TestBucketCache#testCacheBlockNextBlockMetadataMissing is flaky | Major | . |
| [HBASE-20829](https://issues.apache.org/jira/browse/HBASE-20829) | Remove the addFront assertion in MasterProcedureScheduler.doAdd | Major | Replication |
| [HBASE-20825](https://issues.apache.org/jira/browse/HBASE-20825) | Fix pre and post hooks of CloneSnapshot and RestoreSnapshot for Access checks | Major | security |
| [HBASE-20812](https://issues.apache.org/jira/browse/HBASE-20812) | Add defaults to Table Interface so implementors don't have to | Major | . |
| [HBASE-20817](https://issues.apache.org/jira/browse/HBASE-20817) | Infinite loop when executing ReopenTableRegionsProcedure | Blocker | Region Assignment |
| [HBASE-20792](https://issues.apache.org/jira/browse/HBASE-20792) | info:servername and info:sn inconsistent for OPEN region | Blocker | Region Assignment |
| [HBASE-20769](https://issues.apache.org/jira/browse/HBASE-20769) | getSplits() has a out of bounds problem in TableSnapshotInputFormatImpl | Major | . |
| [HBASE-20732](https://issues.apache.org/jira/browse/HBASE-20732) | Shutdown scan pool when master is stopped. | Minor | . |
| [HBASE-20785](https://issues.apache.org/jira/browse/HBASE-20785) | NPE getting metrics in PE testing scans | Major | Performance |
| [HBASE-20795](https://issues.apache.org/jira/browse/HBASE-20795) | Allow option in BBKVComparator.compare to do comparison without sequence id | Major | . |
| [HBASE-20777](https://issues.apache.org/jira/browse/HBASE-20777) | RpcConnection could still remain opened after we shutdown the NettyRpcServer | Major | rpc |
| [HBASE-20403](https://issues.apache.org/jira/browse/HBASE-20403) | Prefetch sometimes doesn't work with encrypted file system | Major | . |
| [HBASE-20635](https://issues.apache.org/jira/browse/HBASE-20635) | Support to convert the shaded user permission proto to client user permission object | Major | . |
| [HBASE-20778](https://issues.apache.org/jira/browse/HBASE-20778) | Make it so WALPE runs on DFS | Major | test |
| [HBASE-20775](https://issues.apache.org/jira/browse/HBASE-20775) | TestMultiParallel is flakey | Major | Region Assignment |
| [HBASE-20752](https://issues.apache.org/jira/browse/HBASE-20752) | Make sure the regions are truly reopened after ReopenTableRegionsProcedure | Major | proc-v2 |
| [HBASE-18622](https://issues.apache.org/jira/browse/HBASE-18622) | Mitigate API compatibility concerns between branch-1 and branch-2 | Blocker | API |
| [HBASE-20767](https://issues.apache.org/jira/browse/HBASE-20767) | Always close hbaseAdmin along with connection in HBTU | Major | test |
| [HBASE-20642](https://issues.apache.org/jira/browse/HBASE-20642) | IntegrationTestDDLMasterFailover throws 'InvalidFamilyOperationException | Major | . |
| [HBASE-20742](https://issues.apache.org/jira/browse/HBASE-20742) | Always create WAL directory for region server | Major | wal |
| [HBASE-20708](https://issues.apache.org/jira/browse/HBASE-20708) | Remove the usage of RecoverMetaProcedure in master startup | Blocker | proc-v2, Region Assignment |
| [HBASE-20723](https://issues.apache.org/jira/browse/HBASE-20723) | Custom hbase.wal.dir results in data loss because we write recovered edits into a different place than where the recovering region server looks for them | Critical | Recovery, wal |
| [HBASE-20681](https://issues.apache.org/jira/browse/HBASE-20681) | IntegrationTestDriver fails after HADOOP-15406 due to missing hamcrest-core | Major | integration tests |
| [HBASE-20561](https://issues.apache.org/jira/browse/HBASE-20561) | The way we stop a ReplicationSource may cause the RS down | Major | Replication |
| [HBASE-19377](https://issues.apache.org/jira/browse/HBASE-19377) | Compatibility checker complaining about hash collisions | Major | community |
| [HBASE-20689](https://issues.apache.org/jira/browse/HBASE-20689) | Docker fails to install rubocop for precommit | Blocker | build |
| [HBASE-20707](https://issues.apache.org/jira/browse/HBASE-20707) | Move MissingSwitchDefault check from checkstyle to error-prone | Major | build |
| [HBASE-20699](https://issues.apache.org/jira/browse/HBASE-20699) | QuotaCache should cancel the QuotaRefresherChore service inside its stop() | Major | . |
| [HBASE-20590](https://issues.apache.org/jira/browse/HBASE-20590) | REST Java client is not able to negotiate with the server in the secure mode | Critical | REST, security |
| [HBASE-20683](https://issues.apache.org/jira/browse/HBASE-20683) | Incorrect return value for PreUpgradeValidator | Critical | . |
| [HBASE-20684](https://issues.apache.org/jira/browse/HBASE-20684) | org.apache.hadoop.hbase.client.Scan#setStopRow javadoc uses incorrect method | Trivial | Client, documentation |
| [HBASE-20678](https://issues.apache.org/jira/browse/HBASE-20678) | NPE in ReplicationSourceManager#NodeFailoverWorker | Minor | . |
| [HBASE-20670](https://issues.apache.org/jira/browse/HBASE-20670) | NPE in HMaster#isInMaintenanceMode | Minor | . |
| [HBASE-20634](https://issues.apache.org/jira/browse/HBASE-20634) | Reopen region while server crash can cause the procedure to be stuck | Critical | . |
| [HBASE-12882](https://issues.apache.org/jira/browse/HBASE-12882) | Log level for org.apache.hadoop.hbase package should be configurable | Major | . |
| [HBASE-20668](https://issues.apache.org/jira/browse/HBASE-20668) | Avoid permission change if ExportSnapshot's copy fails | Major | . |
| [HBASE-18116](https://issues.apache.org/jira/browse/HBASE-18116) | Replication source in-memory accounting should not include bulk transfer hfiles | Major | Replication |
| [HBASE-20602](https://issues.apache.org/jira/browse/HBASE-20602) | hbase.master.quota.observer.ignore property seems to be not taking effect | Minor | documentation |
| [HBASE-20664](https://issues.apache.org/jira/browse/HBASE-20664) | Variable shared across multiple threads | Major | . |
| [HBASE-20659](https://issues.apache.org/jira/browse/HBASE-20659) | Implement a reopen table regions procedure | Major | . |
| [HBASE-20582](https://issues.apache.org/jira/browse/HBASE-20582) | Bump up JRuby version because of some reported vulnerabilities | Major | dependencies, shell |
| [HBASE-20533](https://issues.apache.org/jira/browse/HBASE-20533) | Fix the flaky TestAssignmentManagerMetrics | Major | . |
| [HBASE-20597](https://issues.apache.org/jira/browse/HBASE-20597) | Use a lock to serialize access to a shared reference to ZooKeeperWatcher in HBaseReplicationEndpoint | Minor | Replication |
| [HBASE-20633](https://issues.apache.org/jira/browse/HBASE-20633) | Dropping a table containing a disable violation policy fails to remove the quota upon table delete | Major | . |
| [HBASE-20645](https://issues.apache.org/jira/browse/HBASE-20645) | Fix security\_available method in security.rb | Major | . |
| [HBASE-20612](https://issues.apache.org/jira/browse/HBASE-20612) | TestReplicationKillSlaveRSWithSeparateOldWALs sometimes fail because it uses an expired cluster conn | Major | . |
| [HBASE-20648](https://issues.apache.org/jira/browse/HBASE-20648) | HBASE-19364 "Truncate\_preserve fails with table when replica region \> 1" for master branch | Major | . |
| [HBASE-20588](https://issues.apache.org/jira/browse/HBASE-20588) | Space quota change after quota violation doesn't seem to take in effect | Major | regionserver |
| [HBASE-20616](https://issues.apache.org/jira/browse/HBASE-20616) | TruncateTableProcedure is stuck in retry loop in TRUNCATE\_TABLE\_CREATE\_FS\_LAYOUT state | Major | amv2 |
| [HBASE-20638](https://issues.apache.org/jira/browse/HBASE-20638) | nightly source artifact testing should fail the stage if it's going to report an error on jira | Major | test |
| [HBASE-20624](https://issues.apache.org/jira/browse/HBASE-20624) | Race in ReplicationSource which causes walEntryFilter being null when creating new shipper | Major | Replication |
| [HBASE-20601](https://issues.apache.org/jira/browse/HBASE-20601) | Add multiPut support and other miscellaneous to PE | Minor | tooling |
| [HBASE-20627](https://issues.apache.org/jira/browse/HBASE-20627) | Relocate RS Group pre/post hooks from RSGroupAdminServer to RSGroupAdminEndpoint | Major | . |
| [HBASE-20591](https://issues.apache.org/jira/browse/HBASE-20591) | nightly job doesn't respect maven options | Critical | test |
| [HBASE-20560](https://issues.apache.org/jira/browse/HBASE-20560) | Revisit the TestReplicationDroppedTables ut | Major | . |
| [HBASE-20571](https://issues.apache.org/jira/browse/HBASE-20571) | JMXJsonServlet generates invalid JSON if it has NaN in metrics | Major | UI |
| [HBASE-20585](https://issues.apache.org/jira/browse/HBASE-20585) | Need to clear peer map when clearing MasterProcedureScheduler | Major | proc-v2 |
| [HBASE-20457](https://issues.apache.org/jira/browse/HBASE-20457) | Return immediately for a scan rpc call when we want to switch from pread to stream | Major | scan |
| [HBASE-20447](https://issues.apache.org/jira/browse/HBASE-20447) | Only fail cacheBlock if block collisions aren't related to next block metadata | Major | BlockCache, BucketCache |
| [HBASE-20544](https://issues.apache.org/jira/browse/HBASE-20544) | downstream HBaseTestingUtility fails with invalid port | Blocker | test |
| [HBASE-20004](https://issues.apache.org/jira/browse/HBASE-20004) | Client is not able to execute REST queries in a secure cluster | Minor | REST, security |
| [HBASE-20475](https://issues.apache.org/jira/browse/HBASE-20475) | Fix the flaky TestReplicationDroppedTables unit test. | Major | . |
| [HBASE-20554](https://issues.apache.org/jira/browse/HBASE-20554) | "WALs outstanding" message from CleanerChore is noisy | Trivial | . |
| [HBASE-20204](https://issues.apache.org/jira/browse/HBASE-20204) | Add locking to RefreshFileConnections in BucketCache | Major | BucketCache |
| [HBASE-20485](https://issues.apache.org/jira/browse/HBASE-20485) | Copy constructor of Scan doesn't copy the readType and replicaId | Minor | . |
| [HBASE-20543](https://issues.apache.org/jira/browse/HBASE-20543) | Fix the flaky TestThriftHttpServer | Major | . |
| [HBASE-20521](https://issues.apache.org/jira/browse/HBASE-20521) | TableOutputFormat.checkOutputSpecs conf checking sequence cause pig script run fail | Major | mapreduce |
| [HBASE-20500](https://issues.apache.org/jira/browse/HBASE-20500) | [rsgroup] should keep at least one server in default group | Major | rsgroup |
| [HBASE-20517](https://issues.apache.org/jira/browse/HBASE-20517) | Fix PerformanceEvaluation 'column' parameter | Major | test |
| [HBASE-20524](https://issues.apache.org/jira/browse/HBASE-20524) | Need to clear metrics when ReplicationSourceManager refresh replication sources | Minor | . |
| [HBASE-20476](https://issues.apache.org/jira/browse/HBASE-20476) | Open sequence number could go backwards in AssignProcedure | Major | Region Assignment |
| [HBASE-20506](https://issues.apache.org/jira/browse/HBASE-20506) | Add doc and test for unused RetryCounter, useful-looking utility | Minor | . |
| [HBASE-20492](https://issues.apache.org/jira/browse/HBASE-20492) | UnassignProcedure is stuck in retry loop on region stuck in OPENING state | Critical | amv2 |
| [HBASE-20497](https://issues.apache.org/jira/browse/HBASE-20497) | The getRecoveredQueueStartPos always return 0 in RecoveredReplicationSourceShipper | Major | Replication |
| [HBASE-18842](https://issues.apache.org/jira/browse/HBASE-18842) | The hbase shell clone\_snaphost command returns bad error message | Minor | shell |
| [HBASE-20466](https://issues.apache.org/jira/browse/HBASE-20466) | Consistently use override mechanism for exempt classes in CoprocessClassloader | Major | Coprocessors |
| [HBASE-20006](https://issues.apache.org/jira/browse/HBASE-20006) | TestRestoreSnapshotFromClientWithRegionReplicas is flakey | Critical | read replicas |
| [HBASE-18059](https://issues.apache.org/jira/browse/HBASE-18059) | The scanner order for memstore scanners are wrong | Critical | regionserver, scan, Scanners |
| [HBASE-20404](https://issues.apache.org/jira/browse/HBASE-20404) | Ugly cleanerchore complaint that dir is not empty | Major | master |
| [HBASE-20419](https://issues.apache.org/jira/browse/HBASE-20419) | Fix potential NPE in ZKUtil#listChildrenAndWatchForNewChildren callers | Major | . |
| [HBASE-20364](https://issues.apache.org/jira/browse/HBASE-20364) | nightly job gives old results or no results for stages that timeout on SCM | Critical | test |
| [HBASE-20335](https://issues.apache.org/jira/browse/HBASE-20335) | nightly jobs no longer contain machine information | Critical | test |
| [HBASE-20338](https://issues.apache.org/jira/browse/HBASE-20338) | WALProcedureStore#recoverLease() should have fixed sleeps for retrying rollWriter() | Major | . |
| [HBASE-20356](https://issues.apache.org/jira/browse/HBASE-20356) | make skipping protoc possible | Critical | dependencies, thirdparty |
| [HBASE-15291](https://issues.apache.org/jira/browse/HBASE-15291) | FileSystem not closed in secure bulkLoad | Major | . |
| [HBASE-20068](https://issues.apache.org/jira/browse/HBASE-20068) | Hadoopcheck project health check uses default maven repo instead of yetus managed ones | Major | community, test |
| [HBASE-20361](https://issues.apache.org/jira/browse/HBASE-20361) | Non-successive TableInputSplits may wrongly be merged by auto balancing feature | Major | mapreduce |
| [HBASE-20260](https://issues.apache.org/jira/browse/HBASE-20260) | Purge old content from the book for branch-2/master | Critical | documentation |
| [HBASE-20058](https://issues.apache.org/jira/browse/HBASE-20058) | improper quoting in presplitting command docs | Minor | documentation |
| [HBASE-19923](https://issues.apache.org/jira/browse/HBASE-19923) | Reset peer state and config when refresh replication source failed | Major | Replication |
| [HBASE-19748](https://issues.apache.org/jira/browse/HBASE-19748) | TestRegionReplicaFailover and TestRegionReplicaReplicationEndpoint UT hangs | Major | . |
### TESTS:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-20667](https://issues.apache.org/jira/browse/HBASE-20667) | Rename TestGlobalThrottler to TestReplicationGlobalThrottler | Trivial | . |
| [HBASE-20646](https://issues.apache.org/jira/browse/HBASE-20646) | TestWALProcedureStoreOnHDFS failing on branch-1 | Trivial | . |
| [HBASE-20505](https://issues.apache.org/jira/browse/HBASE-20505) | PE should support multi column family read and write cases | Minor | . |
| [HBASE-20513](https://issues.apache.org/jira/browse/HBASE-20513) | Collect and emit ScanMetrics in PerformanceEvaluation | Minor | test |
| [HBASE-20414](https://issues.apache.org/jira/browse/HBASE-20414) | TestLockProcedure#testMultipleLocks may fail on slow machine | Major | . |
### SUB-TASKS:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-20831](https://issues.apache.org/jira/browse/HBASE-20831) | Copy master doc into branch-2.1 and edit to make it suit 2.1.0 | Blocker | documentation |
| [HBASE-20839](https://issues.apache.org/jira/browse/HBASE-20839) | Fallback to FSHLog if we can not instantiated AsyncFSWAL when user does not specify AsyncFSWAL explicitly | Blocker | wal |
| [HBASE-20244](https://issues.apache.org/jira/browse/HBASE-20244) | NoSuchMethodException when retrieving private method decryptEncryptedDataEncryptionKey from DFSClient | Blocker | wal |
| [HBASE-20193](https://issues.apache.org/jira/browse/HBASE-20193) | Basic Replication Web UI - Regionserver | Critical | Replication, Usability |
| [HBASE-20489](https://issues.apache.org/jira/browse/HBASE-20489) | Update Reference Guide that CLUSTER\_KEY value is present on the Master UI info page. | Minor | documentation |
| [HBASE-19722](https://issues.apache.org/jira/browse/HBASE-19722) | Meta query statistics metrics source | Major | . |
| [HBASE-20781](https://issues.apache.org/jira/browse/HBASE-20781) | Save recalculating families in a WALEdit batch of Cells | Major | Performance |
| [HBASE-20194](https://issues.apache.org/jira/browse/HBASE-20194) | Basic Replication WebUI - Master | Critical | Replication, Usability |
| [HBASE-20780](https://issues.apache.org/jira/browse/HBASE-20780) | ServerRpcConnection logging cleanup | Major | logging, Performance |
| [HBASE-19764](https://issues.apache.org/jira/browse/HBASE-19764) | Fix Checkstyle errors in hbase-endpoint | Minor | . |
| [HBASE-20710](https://issues.apache.org/jira/browse/HBASE-20710) | extra cloneFamily() in Mutation.add(Cell) | Minor | regionserver |
| [HBASE-18569](https://issues.apache.org/jira/browse/HBASE-18569) | Add prefetch support for async region locator | Major | asyncclient, Client |
| [HBASE-20706](https://issues.apache.org/jira/browse/HBASE-20706) | [hack] Don't add known not-OPEN regions in reopen phase of MTP | Critical | amv2 |
| [HBASE-20334](https://issues.apache.org/jira/browse/HBASE-20334) | add a test that expressly uses both our shaded client and the one from hadoop 3 | Major | hadoop3, shading |
| [HBASE-20615](https://issues.apache.org/jira/browse/HBASE-20615) | emphasize use of shaded client jars when they're present in an install | Major | build, Client, Usability |
| [HBASE-20333](https://issues.apache.org/jira/browse/HBASE-20333) | break up shaded client into one with no Hadoop and one that's standalone | Critical | shading |
| [HBASE-20332](https://issues.apache.org/jira/browse/HBASE-20332) | shaded mapreduce module shouldn't include hadoop | Critical | mapreduce, shading |
| [HBASE-20722](https://issues.apache.org/jira/browse/HBASE-20722) | Make RegionServerTracker only depend on children changed event | Major | . |
| [HBASE-20700](https://issues.apache.org/jira/browse/HBASE-20700) | Move meta region when server crash can cause the procedure to be stuck | Critical | master, proc-v2, Region Assignment |
| [HBASE-20628](https://issues.apache.org/jira/browse/HBASE-20628) | SegmentScanner does over-comparing when one flushing | Critical | Performance |
| [HBASE-19761](https://issues.apache.org/jira/browse/HBASE-19761) | Fix Checkstyle errors in hbase-zookeeper | Minor | . |
| [HBASE-19724](https://issues.apache.org/jira/browse/HBASE-19724) | Fix Checkstyle errors in hbase-hadoop2-compat | Minor | . |
| [HBASE-20518](https://issues.apache.org/jira/browse/HBASE-20518) | Need to serialize the enabled field for UpdatePeerConfigProcedure | Major | Replication |
| [HBASE-20481](https://issues.apache.org/jira/browse/HBASE-20481) | Replicate entries from same region serially in ReplicationEndpoint for serial replication | Major | . |
| [HBASE-20378](https://issues.apache.org/jira/browse/HBASE-20378) | Provide a hbck option to cleanup replication barrier for a table | Major | . |
| [HBASE-20128](https://issues.apache.org/jira/browse/HBASE-20128) | Add new UTs which extends the old replication UTs but set replication scope to SERIAL | Major | . |
| [HBASE-20417](https://issues.apache.org/jira/browse/HBASE-20417) | Do not read wal entries when peer is disabled | Major | Replication |
| [HBASE-20294](https://issues.apache.org/jira/browse/HBASE-20294) | Also cleanup last pushed sequence id in ReplicationBarrierCleaner | Major | Replication |
| [HBASE-20377](https://issues.apache.org/jira/browse/HBASE-20377) | Deal with table in enabling and disabling state when modifying serial replication peer | Major | Replication |
| [HBASE-20367](https://issues.apache.org/jira/browse/HBASE-20367) | Write a replication barrier for regions when disabling a table | Major | Replication |
| [HBASE-20296](https://issues.apache.org/jira/browse/HBASE-20296) | Remove last pushed sequence ids when removing tables from a peer | Major | Replication |
| [HBASE-20285](https://issues.apache.org/jira/browse/HBASE-20285) | Delete all last pushed sequence ids when removing a peer or removing the serial flag for a peer | Major | Replication |
| [HBASE-20138](https://issues.apache.org/jira/browse/HBASE-20138) | Find a way to deal with the conflicts when updating replication position | Major | Replication |
| [HBASE-20127](https://issues.apache.org/jira/browse/HBASE-20127) | Add UT for serial replication after failover | Major | Replication, test |
| [HBASE-20271](https://issues.apache.org/jira/browse/HBASE-20271) | ReplicationSourceWALReader.switched should use the file name instead of the path object directly | Major | Replication |
| [HBASE-20227](https://issues.apache.org/jira/browse/HBASE-20227) | Add UT for ReplicationUtils.contains method | Major | Replication, test |
| [HBASE-20147](https://issues.apache.org/jira/browse/HBASE-20147) | Serial replication will be stuck if we create a table with serial replication but add it to a peer after there are region moves | Major | . |
| [HBASE-20116](https://issues.apache.org/jira/browse/HBASE-20116) | Optimize the region last pushed sequence id layout on zk | Major | Replication |
| [HBASE-20242](https://issues.apache.org/jira/browse/HBASE-20242) | The open sequence number will grow if we fail to open a region after writing the max sequence id file | Major | . |
| [HBASE-20155](https://issues.apache.org/jira/browse/HBASE-20155) | update branch-2 version to 2.1.0-SNAPSHOT | Major | build, community |
| [HBASE-20206](https://issues.apache.org/jira/browse/HBASE-20206) | WALEntryStream should not switch WAL file silently | Major | Replication |
| [HBASE-20117](https://issues.apache.org/jira/browse/HBASE-20117) | Cleanup the unused replication barriers in meta table | Major | master, Replication |
| [HBASE-20165](https://issues.apache.org/jira/browse/HBASE-20165) | Shell command to make a normal peer to be a serial replication peer | Major | . |
| [HBASE-20167](https://issues.apache.org/jira/browse/HBASE-20167) | Optimize the implementation of ReplicationSourceWALReader | Major | Replication |
| [HBASE-20125](https://issues.apache.org/jira/browse/HBASE-20125) | Add UT for serial replication after region split and merge | Major | Replication |
| [HBASE-20129](https://issues.apache.org/jira/browse/HBASE-20129) | Add UT for serial replication checker | Major | Replication |
| [HBASE-20115](https://issues.apache.org/jira/browse/HBASE-20115) | Reimplement serial replication based on the new replication storage layer | Major | Replication |
| [HBASE-20050](https://issues.apache.org/jira/browse/HBASE-20050) | Reimplement updateReplicationPositions logic in serial replication based on the newly introduced replication storage layer | Major | . |
| [HBASE-20082](https://issues.apache.org/jira/browse/HBASE-20082) | Fix findbugs errors only on master which are introduced by HBASE-19397 | Major | findbugs |
| [HBASE-19936](https://issues.apache.org/jira/browse/HBASE-19936) | Introduce a new base class for replication peer procedure | Major | . |
| [HBASE-19719](https://issues.apache.org/jira/browse/HBASE-19719) | Fix checkstyle issues | Major | proc-v2, Replication |
| [HBASE-19711](https://issues.apache.org/jira/browse/HBASE-19711) | TestReplicationAdmin.testConcurrentPeerOperations hangs | Major | proc-v2 |
| [HBASE-19707](https://issues.apache.org/jira/browse/HBASE-19707) | Race in start and terminate of a replication source after we async start replicatione endpoint | Major | proc-v2, Replication |
| [HBASE-19636](https://issues.apache.org/jira/browse/HBASE-19636) | All rs should already start work with the new peer change when replication peer procedure is finished | Major | proc-v2, Replication |
| [HBASE-19634](https://issues.apache.org/jira/browse/HBASE-19634) | Add permission check for executeProcedures in AccessController | Major | proc-v2, Replication |
| [HBASE-19697](https://issues.apache.org/jira/browse/HBASE-19697) | Remove TestReplicationAdminUsingProcedure | Major | proc-v2, Replication |
| [HBASE-19661](https://issues.apache.org/jira/browse/HBASE-19661) | Replace ReplicationStateZKBase with ZKReplicationStorageBase | Major | proc-v2, Replication |
| [HBASE-19687](https://issues.apache.org/jira/browse/HBASE-19687) | Move the logic in ReplicationZKNodeCleaner to ReplicationChecker and remove ReplicationZKNodeCleanerChore | Major | proc-v2, Replication |
| [HBASE-19544](https://issues.apache.org/jira/browse/HBASE-19544) | Add UTs for testing concurrent modifications on replication peer | Major | proc-v2, Replication, test |
| [HBASE-19686](https://issues.apache.org/jira/browse/HBASE-19686) | Use KeyLocker instead of ReentrantLock in PeerProcedureHandlerImpl | Major | proc-v2, Replication |
| [HBASE-19623](https://issues.apache.org/jira/browse/HBASE-19623) | Create replication endpoint asynchronously when adding a replication source | Major | proc-v2, Replication |
| [HBASE-19633](https://issues.apache.org/jira/browse/HBASE-19633) | Clean up the replication queues in the postPeerModification stage when removing a peer | Major | proc-v2, Replication |
| [HBASE-19622](https://issues.apache.org/jira/browse/HBASE-19622) | Reimplement ReplicationPeers with the new replication storage interface | Major | proc-v2, Replication |
| [HBASE-19635](https://issues.apache.org/jira/browse/HBASE-19635) | Introduce a thread at RS side to call reportProcedureDone | Major | proc-v2 |
| [HBASE-19617](https://issues.apache.org/jira/browse/HBASE-19617) | Remove ReplicationQueues, use ReplicationQueueStorage directly | Major | Replication |
| [HBASE-19642](https://issues.apache.org/jira/browse/HBASE-19642) | Fix locking for peer modification procedure | Critical | proc-v2, Replication |
| [HBASE-19592](https://issues.apache.org/jira/browse/HBASE-19592) | Add UTs to test retry on update zk failure | Major | proc-v2, Replication |
| [HBASE-19630](https://issues.apache.org/jira/browse/HBASE-19630) | Add peer cluster key check when add new replication peer | Major | proc-v2, Replication |
| [HBASE-19573](https://issues.apache.org/jira/browse/HBASE-19573) | Rewrite ReplicationPeer with the new replication storage interface | Major | proc-v2, Replication |
| [HBASE-19579](https://issues.apache.org/jira/browse/HBASE-19579) | Add peer lock test for shell command list\_locks | Major | proc-v2, Replication |
| [HBASE-19599](https://issues.apache.org/jira/browse/HBASE-19599) | Remove ReplicationQueuesClient, use ReplicationQueueStorage directly | Major | Replication |
| [HBASE-19543](https://issues.apache.org/jira/browse/HBASE-19543) | Abstract a replication storage interface to extract the zk specific code | Major | proc-v2, Replication |
| [HBASE-19525](https://issues.apache.org/jira/browse/HBASE-19525) | RS side changes for moving peer modification from zk watcher to procedure | Major | proc-v2, Replication |
| [HBASE-19580](https://issues.apache.org/jira/browse/HBASE-19580) | Use slf4j instead of commons-logging in new, just-added Peer Procedure classes | Major | proc-v2, Replication |
| [HBASE-19520](https://issues.apache.org/jira/browse/HBASE-19520) | Add UTs for the new lock type PEER | Major | proc-v2 |
| [HBASE-19564](https://issues.apache.org/jira/browse/HBASE-19564) | Procedure id is missing in the response of peer related operations | Major | proc-v2, Replication |
| [HBASE-19536](https://issues.apache.org/jira/browse/HBASE-19536) | Client side changes for moving peer modification from zk watcher to procedure | Major | Replication |
| [HBASE-19524](https://issues.apache.org/jira/browse/HBASE-19524) | Master side changes for moving peer modification from zk watcher to procedure | Major | proc-v2, Replication |
| [HBASE-19216](https://issues.apache.org/jira/browse/HBASE-19216) | Implement a general framework to execute remote procedure on RS | Major | proc-v2, Replication |
### OTHER:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-19997](https://issues.apache.org/jira/browse/HBASE-19997) | [rolling upgrade] 1.x =\> 2.x | Blocker | . |
| [HBASE-20360](https://issues.apache.org/jira/browse/HBASE-20360) | Further optimization for serial replication | Major | Replication |
| [HBASE-20862](https://issues.apache.org/jira/browse/HBASE-20862) | Address 2.1.0 Compatibility Report Issues | Blocker | compatibility |
| [HBASE-20665](https://issues.apache.org/jira/browse/HBASE-20665) | "Already cached block XXX" message should be DEBUG | Minor | BlockCache |
| [HBASE-20677](https://issues.apache.org/jira/browse/HBASE-20677) | Backport test of HBASE-20566 'Creating a system table after enabling rsgroup feature puts region into RIT' to branch-2 | Major | . |
| [HBASE-19475](https://issues.apache.org/jira/browse/HBASE-19475) | Extend backporting strategy in documentation | Trivial | documentation |
| [HBASE-20595](https://issues.apache.org/jira/browse/HBASE-20595) | Remove the concept of 'special tables' from rsgroups | Major | Region Assignment, rsgroup |
| [HBASE-20415](https://issues.apache.org/jira/browse/HBASE-20415) | branches-2 don't need maven-scala-plugin | Major | build |
| [HBASE-20112](https://issues.apache.org/jira/browse/HBASE-20112) | Include test results from nightly hadoop3 tests in jenkins test results | Critical | test |
| [HBASE-17918](https://issues.apache.org/jira/browse/HBASE-17918) | document serial replication | Critical | documentation, Replication |
| [HBASE-19737](https://issues.apache.org/jira/browse/HBASE-19737) | Manage a HBASE-19397-branch-2 branch and merge it to branch-2 | Major | proc-v2, Replication |
## Release 2.0.0 - Unreleased (as of 2018-04-22)
### INCOMPATIBLE CHANGES:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-20276](https://issues.apache.org/jira/browse/HBASE-20276) | [shell] Revert shell REPL change and document | Blocker | documentation, shell |
| [HBASE-16459](https://issues.apache.org/jira/browse/HBASE-16459) | Remove unused hbase shell --format option | Trivial | shell |
| [HBASE-19128](https://issues.apache.org/jira/browse/HBASE-19128) | Purge Distributed Log Replay from codebase, configurations, text; mark the feature as unsupported, broken. | Major | documentation |
| [HBASE-19504](https://issues.apache.org/jira/browse/HBASE-19504) | Add TimeRange support into checkAndMutate | Major | . |
| [HBASE-20119](https://issues.apache.org/jira/browse/HBASE-20119) | Introduce a pojo class to carry coprocessor information in order to make TableDescriptorBuilder accept multiple cp at once | Minor | . |
| [HBASE-19437](https://issues.apache.org/jira/browse/HBASE-19437) | Batch operation can't handle the null result for Append/Increment | Critical | Usability |
| [HBASE-19873](https://issues.apache.org/jira/browse/HBASE-19873) | Add a CategoryBasedTimeout ClassRule for all UTs | Major | . |
| [HBASE-19783](https://issues.apache.org/jira/browse/HBASE-19783) | Change replication peer cluster key/endpoint from a not-null value to null is not allowed | Minor | Replication |
| [HBASE-19483](https://issues.apache.org/jira/browse/HBASE-19483) | Add proper privilege check for rsgroup commands | Major | rsgroup, security |
| [HBASE-19492](https://issues.apache.org/jira/browse/HBASE-19492) | Add EXCLUDE\_NAMESPACE and EXCLUDE\_TABLECFS support to replication peer config | Major | . |
| [HBASE-19357](https://issues.apache.org/jira/browse/HBASE-19357) | Bucket cache no longer L2 for LRU cache | Major | . |
| [HBASE-19359](https://issues.apache.org/jira/browse/HBASE-19359) | Revisit the default config of hbase client retries number | Major | . |
| [HBASE-19092](https://issues.apache.org/jira/browse/HBASE-19092) | Make Tag IA.LimitedPrivate and expose for CPs | Critical | Coprocessors |
| [HBASE-19187](https://issues.apache.org/jira/browse/HBASE-19187) | Remove option to create on heap bucket cache | Minor | regionserver |
| [HBASE-19033](https://issues.apache.org/jira/browse/HBASE-19033) | Allow CP users to change versions and TTL before opening StoreScanner | Blocker | Coprocessors |
| [HBASE-19047](https://issues.apache.org/jira/browse/HBASE-19047) | CP exposed Scanner types should not extend Shipper | Critical | Coprocessors |
| [HBASE-18905](https://issues.apache.org/jira/browse/HBASE-18905) | Allow CPs to request flush on Region and know the completion of the requested flush | Major | Coprocessors |
| [HBASE-18410](https://issues.apache.org/jira/browse/HBASE-18410) | FilterList Improvement. | Major | Filters |
| [HBASE-18893](https://issues.apache.org/jira/browse/HBASE-18893) | Remove Add/Modify/DeleteColumnFamilyProcedure in favor of using ModifyTableProcedure | Major | Coprocessors, master |
| [HBASE-19067](https://issues.apache.org/jira/browse/HBASE-19067) | Do not expose getHDFSBlockDistribution in StoreFile | Major | Coprocessors |
| [HBASE-18989](https://issues.apache.org/jira/browse/HBASE-18989) | Polish the compaction related CP hooks | Major | Compaction, Coprocessors |
| [HBASE-19046](https://issues.apache.org/jira/browse/HBASE-19046) | RegionObserver#postCompactSelection Avoid passing shaded ImmutableList param | Major | Coprocessors |
| [HBASE-19001](https://issues.apache.org/jira/browse/HBASE-19001) | Remove the hooks in RegionObserver which are designed to construct a StoreScanner which is marked as IA.Private | Major | Coprocessors |
| [HBASE-14247](https://issues.apache.org/jira/browse/HBASE-14247) | Separate the old WALs into different regionserver directories | Critical | wal |
| [HBASE-18183](https://issues.apache.org/jira/browse/HBASE-18183) | Region interface cleanup for CP expose | Major | Coprocessors |
| [HBASE-18878](https://issues.apache.org/jira/browse/HBASE-18878) | Use Optional\<T\> return types when T can be null | Major | Coprocessors |
| [HBASE-18649](https://issues.apache.org/jira/browse/HBASE-18649) | Deprecate KV Usage in MR to move to Cells in 3.0 | Major | API, mapreduce |
| [HBASE-18897](https://issues.apache.org/jira/browse/HBASE-18897) | Substitute MemStore for Memstore | Major | . |
| [HBASE-18883](https://issues.apache.org/jira/browse/HBASE-18883) | Upgrade to Curator 4.0 | Major | Client, dependencies |
| [HBASE-18839](https://issues.apache.org/jira/browse/HBASE-18839) | Apply RegionInfo to code base | Major | Coprocessors |
| [HBASE-18826](https://issues.apache.org/jira/browse/HBASE-18826) | Use HStore instead of Store in our own code base and remove unnecessary methods in Store interface | Major | Coprocessors |
| [HBASE-17732](https://issues.apache.org/jira/browse/HBASE-17732) | Coprocessor Design Improvements | Critical | Coprocessors |
| [HBASE-18298](https://issues.apache.org/jira/browse/HBASE-18298) | RegionServerServices Interface cleanup for CP expose | Critical | Coprocessors |
| [HBASE-16769](https://issues.apache.org/jira/browse/HBASE-16769) | Deprecate/remove PB references from MasterObserver and RegionServerObserver | Blocker | . |
| [HBASE-18859](https://issues.apache.org/jira/browse/HBASE-18859) | Purge PB from BulkLoadObserver | Major | Coprocessors |
| [HBASE-18731](https://issues.apache.org/jira/browse/HBASE-18731) | [compat 1-2] Mark protected methods of QuotaSettings that touch Protobuf internals as IA.Private | Major | API |
| [HBASE-18825](https://issues.apache.org/jira/browse/HBASE-18825) | Use HStoreFile instead of StoreFile in our own code base and remove unnecessary methods in StoreFile interface | Major | Coprocessors |
| [HBASE-18142](https://issues.apache.org/jira/browse/HBASE-18142) | Deletion of a cell deletes the previous versions too | Major | API, shell |
| [HBASE-18446](https://issues.apache.org/jira/browse/HBASE-18446) | Mark StoreFileScanner/StoreFileReader as IA.LimitedPrivate(Phoenix) | Critical | Coprocessors |
| [HBASE-18798](https://issues.apache.org/jira/browse/HBASE-18798) | Remove the unused methods in RegionServerObserver | Major | Coprocessors |
| [HBASE-18453](https://issues.apache.org/jira/browse/HBASE-18453) | CompactionRequest should not be exposed to user directly | Major | Coprocessors |
| [HBASE-18794](https://issues.apache.org/jira/browse/HBASE-18794) | Remove deprecated methods in MasterObserver | Major | Coprocessors |
| [HBASE-17823](https://issues.apache.org/jira/browse/HBASE-17823) | Migrate to Apache Yetus Audience Annotations | Major | API |
| [HBASE-18793](https://issues.apache.org/jira/browse/HBASE-18793) | Remove deprecated methods in RegionObserver | Major | Coprocessors |
| [HBASE-18733](https://issues.apache.org/jira/browse/HBASE-18733) | [compat 1-2] Hide WALKey | Major | API |
| [HBASE-16479](https://issues.apache.org/jira/browse/HBASE-16479) | Move WALEdit from hbase.regionserver.wal package to hbase.wal package | Major | wal |
| [HBASE-18783](https://issues.apache.org/jira/browse/HBASE-18783) | Declare the builder of ClusterStatus as IA.Private, and remove the Writables from ClusterStatus | Minor | . |
| [HBASE-18106](https://issues.apache.org/jira/browse/HBASE-18106) | Redo ProcedureInfo and LockInfo | Critical | proc-v2 |
| [HBASE-18780](https://issues.apache.org/jira/browse/HBASE-18780) | Remove HLogPrettyPrinter and hlog command | Minor | documentation, wal |
| [HBASE-18704](https://issues.apache.org/jira/browse/HBASE-18704) | Upgrade hbase to commons-collections 4 | Major | dependencies |
| [HBASE-15607](https://issues.apache.org/jira/browse/HBASE-15607) | Remove PB references from Admin for 2.0 | Blocker | . |
| [HBASE-18736](https://issues.apache.org/jira/browse/HBASE-18736) | Cleanup the HTD/HCD for Admin | Major | . |
| [HBASE-18577](https://issues.apache.org/jira/browse/HBASE-18577) | shaded client includes several non-relocated third party dependencies | Critical | Client |
| [HBASE-3935](https://issues.apache.org/jira/browse/HBASE-3935) | HServerLoad.storefileIndexSizeMB should be changed to storefileIndexSizeKB | Major | . |
| [HBASE-15982](https://issues.apache.org/jira/browse/HBASE-15982) | Interface ReplicationEndpoint extends Guava's Service | Blocker | . |
| [HBASE-18546](https://issues.apache.org/jira/browse/HBASE-18546) | Always overwrite the TS for Append/Increment unless no existing cells are found | Critical | API, Client |
| [HBASE-17442](https://issues.apache.org/jira/browse/HBASE-17442) | Move most of the replication related classes from hbase-client to hbase-replication package | Critical | build, Replication |
| [HBASE-18511](https://issues.apache.org/jira/browse/HBASE-18511) | Default no regions on master | Blocker | master |
| [HBASE-18528](https://issues.apache.org/jira/browse/HBASE-18528) | DON'T allow user to modify the passed table/column descriptor | Critical | Coprocessors, master |
| [HBASE-18469](https://issues.apache.org/jira/browse/HBASE-18469) | Correct RegionServer metric of totalRequestCount | Critical | metrics, regionserver |
| [HBASE-18500](https://issues.apache.org/jira/browse/HBASE-18500) | Performance issue: Don't use BufferedMutator for HTable's put method | Major | . |
| [HBASE-17125](https://issues.apache.org/jira/browse/HBASE-17125) | Inconsistent result when use filter to read data | Critical | . |
| [HBASE-18517](https://issues.apache.org/jira/browse/HBASE-18517) | limit max log message width in log4j | Major | . |
| [HBASE-18502](https://issues.apache.org/jira/browse/HBASE-18502) | Change MasterObserver to use TableDescriptor and ColumnFamilyDescriptor | Critical | Coprocessors, master |
| [HBASE-18374](https://issues.apache.org/jira/browse/HBASE-18374) | RegionServer Metrics improvements | Major | . |
| [HBASE-17908](https://issues.apache.org/jira/browse/HBASE-17908) | Upgrade guava | Critical | dependencies |
| [HBASE-18161](https://issues.apache.org/jira/browse/HBASE-18161) | Incremental Load support for Multiple-Table HFileOutputFormat | Minor | . |
| [HBASE-18267](https://issues.apache.org/jira/browse/HBASE-18267) | The result from the postAppend is ignored | Major | Coprocessors |
| [HBASE-18241](https://issues.apache.org/jira/browse/HBASE-18241) | Change client.Table, client.Admin, Region, Store, and HBaseTestingUtility to not use HTableDescriptor or HColumnDescriptor | Critical | Client |
| [HBASE-18038](https://issues.apache.org/jira/browse/HBASE-18038) | Rename StoreFile to HStoreFile and add a StoreFile interface for CP | Critical | Coprocessors, regionserver |
| [HBASE-16196](https://issues.apache.org/jira/browse/HBASE-16196) | Update jruby to a newer version. | Critical | dependencies, shell |
| [HBASE-14614](https://issues.apache.org/jira/browse/HBASE-14614) | Procedure v2: Core Assignment Manager | Major | proc-v2 |
| [HBASE-3462](https://issues.apache.org/jira/browse/HBASE-3462) | Fix table.jsp in regards to splitting a region/table with an optional splitkey | Major | master |
| [HBASE-11013](https://issues.apache.org/jira/browse/HBASE-11013) | Clone Snapshots on Secure Cluster Should provide option to apply Retained User Permissions | Major | snapshots |
| [HBASE-15296](https://issues.apache.org/jira/browse/HBASE-15296) | Break out writer and reader from StoreFile | Major | regionserver |
| [HBASE-15199](https://issues.apache.org/jira/browse/HBASE-15199) | Move jruby jar so only on hbase-shell module classpath; currently globally available | Critical | dependencies, jruby, shell |
| [HBASE-18009](https://issues.apache.org/jira/browse/HBASE-18009) | Move RpcServer.Call to a separated file | Major | IPC/RPC |
| [HBASE-17956](https://issues.apache.org/jira/browse/HBASE-17956) | Raw scan should ignore TTL | Major | scan |
| [HBASE-17914](https://issues.apache.org/jira/browse/HBASE-17914) | Create a new reader instead of cloning a new StoreFile when compaction | Major | Compaction, regionserver |
| [HBASE-17595](https://issues.apache.org/jira/browse/HBASE-17595) | Add partial result support for small/limited scan | Critical | asyncclient, Client, scan |
| [HBASE-17584](https://issues.apache.org/jira/browse/HBASE-17584) | Expose ScanMetrics with ResultScanner rather than Scan | Major | Client, mapreduce, scan |
| [HBASE-17716](https://issues.apache.org/jira/browse/HBASE-17716) | Formalize Scan Metric names | Minor | metrics |
| [HBASE-17312](https://issues.apache.org/jira/browse/HBASE-17312) | [JDK8] Use default method for Observer Coprocessors | Major | Coprocessors |
| [HBASE-17647](https://issues.apache.org/jira/browse/HBASE-17647) | OffheapKeyValue#heapSize() implementation is wrong | Major | regionserver |
| [HBASE-17472](https://issues.apache.org/jira/browse/HBASE-17472) | Correct the semantic of permission grant | Major | Admin |
| [HBASE-17599](https://issues.apache.org/jira/browse/HBASE-17599) | Use mayHaveMoreCellsInRow instead of isPartial | Major | Client, scan |
| [HBASE-17508](https://issues.apache.org/jira/browse/HBASE-17508) | Unify the implementation of small scan and regular scan for sync client | Major | Client, scan |
| [HBASE-12894](https://issues.apache.org/jira/browse/HBASE-12894) | Upgrade Jetty to 9.2.6 | Critical | REST, UI |
| [HBASE-16786](https://issues.apache.org/jira/browse/HBASE-16786) | Procedure V2 - Move ZK-lock's uses to Procedure framework locks (LockProcedure) | Major | . |
| [HBASE-17470](https://issues.apache.org/jira/browse/HBASE-17470) | Remove merge region code from region server | Major | regionserver |
| [HBASE-5401](https://issues.apache.org/jira/browse/HBASE-5401) | PerformanceEvaluation generates 10x the number of expected mappers | Major | test |
| [HBASE-17221](https://issues.apache.org/jira/browse/HBASE-17221) | Abstract out an interface for RpcServer.Call | Major | . |
| [HBASE-16119](https://issues.apache.org/jira/browse/HBASE-16119) | Procedure v2 - Reimplement merge | Major | proc-v2, Region Assignment |
| [HBASE-17132](https://issues.apache.org/jira/browse/HBASE-17132) | Cleanup deprecated code for WAL | Major | wal |
| [HBASE-17017](https://issues.apache.org/jira/browse/HBASE-17017) | Remove the current per-region latency histogram metrics | Major | metrics |
| [HBASE-15513](https://issues.apache.org/jira/browse/HBASE-15513) | hbase.hregion.memstore.chunkpool.maxsize is 0.0 by default | Major | . |
| [HBASE-16972](https://issues.apache.org/jira/browse/HBASE-16972) | Log more details for Scan#next request when responseTooSlow | Major | Operability |
| [HBASE-16765](https://issues.apache.org/jira/browse/HBASE-16765) | New SteppingRegionSplitPolicy, avoid too aggressive spread of regions for small tables. | Critical | . |
| [HBASE-16747](https://issues.apache.org/jira/browse/HBASE-16747) | Track memstore data size and heap overhead separately | Major | regionserver |
| [HBASE-14551](https://issues.apache.org/jira/browse/HBASE-14551) | Procedure v2 - Reimplement split | Minor | proc-v2 |
| [HBASE-16729](https://issues.apache.org/jira/browse/HBASE-16729) | Define the behavior of (default) empty FilterList | Trivial | . |
| [HBASE-16799](https://issues.apache.org/jira/browse/HBASE-16799) | CP exposed Store should not expose unwanted APIs | Major | . |
| [HBASE-16117](https://issues.apache.org/jira/browse/HBASE-16117) | Fix Connection leak in mapred.TableOutputFormat | Major | mapreduce |
| [HBASE-15638](https://issues.apache.org/jira/browse/HBASE-15638) | Shade protobuf | Critical | Protobufs |
| [HBASE-16257](https://issues.apache.org/jira/browse/HBASE-16257) | Move staging dir to be under hbase root dir | Blocker | . |
| [HBASE-16650](https://issues.apache.org/jira/browse/HBASE-16650) | Wrong usage of BlockCache eviction stat for heap memory tuning | Major | . |
| [HBASE-16598](https://issues.apache.org/jira/browse/HBASE-16598) | Enable zookeeper useMulti always and clean up in HBase code | Major | . |
| [HBASE-15297](https://issues.apache.org/jira/browse/HBASE-15297) | error message is wrong when a wrong namspace is specified in grant in hbase shell | Minor | shell |
| [HBASE-16340](https://issues.apache.org/jira/browse/HBASE-16340) | ensure no Xerces jars included | Critical | dependencies |
| [HBASE-16321](https://issues.apache.org/jira/browse/HBASE-16321) | Ensure findbugs jsr305 jar isn't present | Blocker | dependencies |
| [HBASE-16355](https://issues.apache.org/jira/browse/HBASE-16355) | hbase-client dependency on hbase-common test-jar should be test scope | Major | Client, dependencies |
| [HBASE-16186](https://issues.apache.org/jira/browse/HBASE-16186) | Fix AssignmentManager MBean name | Major | master |
| [HBASE-13823](https://issues.apache.org/jira/browse/HBASE-13823) | Procedure V2: unnecessaery operations on AssignmentManager#recoverTableInDisablingState() and recoverTableInEnablingState() | Major | master, proc-v2 |
| [HBASE-15950](https://issues.apache.org/jira/browse/HBASE-15950) | Fix memstore size estimates to be more tighter | Major | . |
| [HBASE-15971](https://issues.apache.org/jira/browse/HBASE-15971) | Regression: Random Read/WorkloadC slower in 1.x than 0.98 | Critical | rpc |
| [HBASE-15875](https://issues.apache.org/jira/browse/HBASE-15875) | Remove HTable references and HTableInterface | Major | . |
| [HBASE-15610](https://issues.apache.org/jira/browse/HBASE-15610) | Remove deprecated HConnection for 2.0 thus removing all PB references for 2.0 | Blocker | . |
| [HBASE-15876](https://issues.apache.org/jira/browse/HBASE-15876) | Remove doBulkLoad(Path hfofDir, final HTable table) though it has not been through a full deprecation cycle | Blocker | . |
| [HBASE-15575](https://issues.apache.org/jira/browse/HBASE-15575) | Rename table DDL \*Handler methods in MasterObserver to more meaningful names | Minor | Coprocessors |
| [HBASE-15481](https://issues.apache.org/jira/browse/HBASE-15481) | Add pre/post roll to WALObserver | Trivial | . |
| [HBASE-15568](https://issues.apache.org/jira/browse/HBASE-15568) | Procedure V2 - Remove CreateTableHandler in HBase Apache 2.0 release | Major | master, proc-v2 |
| [HBASE-15521](https://issues.apache.org/jira/browse/HBASE-15521) | Procedure V2 - RestoreSnapshot and CloneSnapshot | Major | Client, master, proc-v2 |
| [HBASE-11393](https://issues.apache.org/jira/browse/HBASE-11393) | Replication TableCfs should be a PB object rather than a string | Major | Replication |
| [HBASE-15265](https://issues.apache.org/jira/browse/HBASE-15265) | Implement an asynchronous FSHLog | Major | wal |
| [HBASE-15323](https://issues.apache.org/jira/browse/HBASE-15323) | Hbase Rest CheckAndDeleteAPi should be able to delete more cells | Major | hbase |
| [HBASE-15377](https://issues.apache.org/jira/browse/HBASE-15377) | Per-RS Get metric is time based, per-region metric is size-based | Major | . |
| [HBASE-13963](https://issues.apache.org/jira/browse/HBASE-13963) | avoid leaking jdk.tools | Critical | build, documentation |
| [HBASE-15376](https://issues.apache.org/jira/browse/HBASE-15376) | ScanNext metric is size-based while every other per-operation metric is time based | Major | . |
| [HBASE-15290](https://issues.apache.org/jira/browse/HBASE-15290) | Hbase Rest CheckAndAPI should save other cells along with compared cell | Major | hbase |
| [HBASE-15100](https://issues.apache.org/jira/browse/HBASE-15100) | Master WALProcs still never clean up | Blocker | master, proc-v2 |
| [HBASE-15111](https://issues.apache.org/jira/browse/HBASE-15111) | "hbase version" should write to stdout | Trivial | util |
| [HBASE-14888](https://issues.apache.org/jira/browse/HBASE-14888) | ClusterSchema: Add Namespace Operations | Major | API |
| [HBASE-15018](https://issues.apache.org/jira/browse/HBASE-15018) | Inconsistent way of handling TimeoutException in the rpc client implementations | Major | Client, IPC/RPC |
| [HBASE-14205](https://issues.apache.org/jira/browse/HBASE-14205) | RegionCoprocessorHost System.nanoTime() performance bottleneck | Critical | Coprocessors, Performance, regionserver |
| [HBASE-12751](https://issues.apache.org/jira/browse/HBASE-12751) | Allow RowLock to be reader writer | Major | regionserver |
| [HBASE-13706](https://issues.apache.org/jira/browse/HBASE-13706) | CoprocessorClassLoader should not exempt Hive classes | Minor | Coprocessors |
| [HBASE-13954](https://issues.apache.org/jira/browse/HBASE-13954) | Remove HTableInterface#getRowOrBefore related server side code | Major | API |
| [HBASE-12296](https://issues.apache.org/jira/browse/HBASE-12296) | Filters should work with ByteBufferedCell | Major | regionserver, Scanners |
| [HBASE-14027](https://issues.apache.org/jira/browse/HBASE-14027) | Clean up netty dependencies | Major | build |
| [HBASE-7782](https://issues.apache.org/jira/browse/HBASE-7782) | HBaseTestingUtility.truncateTable() not acting like CLI | Minor | test |
| [HBASE-14047](https://issues.apache.org/jira/browse/HBASE-14047) | Cleanup deprecated APIs from Cell class | Major | Client |
| [HBASE-13849](https://issues.apache.org/jira/browse/HBASE-13849) | Remove restore and clone snapshot from the WebUI | Major | snapshots |
| [HBASE-13646](https://issues.apache.org/jira/browse/HBASE-13646) | HRegion#execService should not try to build incomplete messages | Major | Coprocessors, regionserver |
| [HBASE-13983](https://issues.apache.org/jira/browse/HBASE-13983) | Doc how the oddball HTable methods getStartKey, getEndKey, etc. will be removed in 2.0.0 | Minor | documentation |
| [HBASE-13214](https://issues.apache.org/jira/browse/HBASE-13214) | Remove deprecated and unused methods from HTable class | Major | API |
| [HBASE-13843](https://issues.apache.org/jira/browse/HBASE-13843) | Fix internal constant text in ReplicationManager.java | Trivial | master |
| [HBASE-13375](https://issues.apache.org/jira/browse/HBASE-13375) | Provide HBase superuser higher priority over other users in the RPC handling | Major | IPC/RPC |
| [HBASE-13636](https://issues.apache.org/jira/browse/HBASE-13636) | Remove deprecation for HBASE-4072 (Reading of zoo.cfg) | Major | . |
| [HBASE-10800](https://issues.apache.org/jira/browse/HBASE-10800) | Use CellComparator instead of KVComparator | Major | . |
| [HBASE-13118](https://issues.apache.org/jira/browse/HBASE-13118) | [PE] Add being able to write many columns | Major | test |
| [HBASE-12990](https://issues.apache.org/jira/browse/HBASE-12990) | MetaScanner should be replaced by MetaTableAccessor | Major | Client |
| [HBASE-13373](https://issues.apache.org/jira/browse/HBASE-13373) | Squash HFileReaderV3 together with HFileReaderV2 and AbstractHFileReader; ditto for Scanners and BlockReader, etc. | Major | . |
| [HBASE-10728](https://issues.apache.org/jira/browse/HBASE-10728) | get\_counter value is never used. | Major | . |
| [HBASE-13298](https://issues.apache.org/jira/browse/HBASE-13298) | Clarify if Table.{set\|get}WriteBufferSize() is deprecated or not | Critical | API |
| [HBASE-13248](https://issues.apache.org/jira/browse/HBASE-13248) | Make HConnectionImplementation top-level class. | Major | API |
| [HBASE-13198](https://issues.apache.org/jira/browse/HBASE-13198) | Remove HConnectionManager | Major | API |
| [HBASE-12586](https://issues.apache.org/jira/browse/HBASE-12586) | Task 6 & 7 from HBASE-9117, delete all public HTable constructors and delete ConnectionManager#{delete,get}Connection | Major | . |
| [HBASE-13171](https://issues.apache.org/jira/browse/HBASE-13171) | Change AccessControlClient methods to accept connection object to reduce setup time. | Minor | . |
| [HBASE-6778](https://issues.apache.org/jira/browse/HBASE-6778) | Deprecate Chore; its a thread per task when we should have one thread to do all tasks | Major | . |
| [HBASE-12684](https://issues.apache.org/jira/browse/HBASE-12684) | Add new AsyncRpcClient | Major | Client |
| [HBASE-10378](https://issues.apache.org/jira/browse/HBASE-10378) | Divide HLog interface into User and Implementor specific interfaces | Major | wal |
| [HBASE-12111](https://issues.apache.org/jira/browse/HBASE-12111) | Remove deprecated APIs from Mutation(s) | Major | Client |
| [HBASE-12084](https://issues.apache.org/jira/browse/HBASE-12084) | Remove deprecated APIs from Result | Major | Client |
| [HBASE-12048](https://issues.apache.org/jira/browse/HBASE-12048) | Remove deprecated APIs from Filter | Major | regionserver |
| [HBASE-11556](https://issues.apache.org/jira/browse/HBASE-11556) | Move HTablePool to hbase-thrift module. | Major | Thrift |
| [HBASE-4072](https://issues.apache.org/jira/browse/HBASE-4072) | Deprecate/disable and remove support for reading ZooKeeper zoo.cfg files from the classpath | Major | . |
### IMPORTANT ISSUES:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-15780](https://issues.apache.org/jira/browse/HBASE-15780) | Expose AuthUtil as IA.Public | Critical | API, security |
| [HBASE-15322](https://issues.apache.org/jira/browse/HBASE-15322) | Operations using Unsafe path broken for platforms not having sun.misc.Unsafe | Critical | hbase |
| [HBASE-15125](https://issues.apache.org/jira/browse/HBASE-15125) | HBaseFsck's adoptHdfsOrphan function creates region with wrong end key boundary | Major | hbck |
### NEW FEATURES:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-19950](https://issues.apache.org/jira/browse/HBASE-19950) | Introduce a ColumnValueFilter | Minor | Filters |
| [HBASE-19844](https://issues.apache.org/jira/browse/HBASE-19844) | Shell should support flush by regionserver | Minor | shell |
| [HBASE-19886](https://issues.apache.org/jira/browse/HBASE-19886) | Display maintenance mode in shell, web UI | Major | . |
| [HBASE-19528](https://issues.apache.org/jira/browse/HBASE-19528) | Major Compaction Tool | Major | . |
| [HBASE-19897](https://issues.apache.org/jira/browse/HBASE-19897) | RowMutations should follow the fluent pattern | Minor | . |
| [HBASE-4224](https://issues.apache.org/jira/browse/HBASE-4224) | Need a flush by regionserver rather than by table option | Major | . |
| [HBASE-15321](https://issues.apache.org/jira/browse/HBASE-15321) | Ability to open a HRegion from hdfs snapshot. | Major | . |
| [HBASE-19799](https://issues.apache.org/jira/browse/HBASE-19799) | Add web UI to rsgroup | Major | rsgroup, UI |
| [HBASE-19326](https://issues.apache.org/jira/browse/HBASE-19326) | Remove decommissioned servers from rsgroup | Major | rsgroup |
| [HBASE-19189](https://issues.apache.org/jira/browse/HBASE-19189) | Ad-hoc test job for running a subset of tests lots of times | Major | build |
| [HBASE-19103](https://issues.apache.org/jira/browse/HBASE-19103) | Add BigDecimalComparator for filter | Minor | Client |
| [HBASE-18171](https://issues.apache.org/jira/browse/HBASE-18171) | Scanning cursor for async client | Major | . |
| [HBASE-18875](https://issues.apache.org/jira/browse/HBASE-18875) | Thrift server supports read-only mode | Major | Thrift |
| [HBASE-14417](https://issues.apache.org/jira/browse/HBASE-14417) | Incremental backup and bulk loading | Blocker | . |
| [HBASE-18131](https://issues.apache.org/jira/browse/HBASE-18131) | Add an hbase shell command to clear deadserver list in ServerManager | Major | Operability |
| [HBASE-15806](https://issues.apache.org/jira/browse/HBASE-15806) | An endpoint-based export tool | Critical | Coprocessors, tooling |
| [HBASE-14135](https://issues.apache.org/jira/browse/HBASE-14135) | HBase Backup/Restore Phase 3: Merge backup images | Critical | . |
| [HBASE-15134](https://issues.apache.org/jira/browse/HBASE-15134) | Add visibility into Flush and Compaction queues | Major | Compaction, metrics, regionserver |
| [HBASE-15968](https://issues.apache.org/jira/browse/HBASE-15968) | New behavior of versions considering mvcc and ts rather than ts only | Major | . |
| [HBASE-15943](https://issues.apache.org/jira/browse/HBASE-15943) | Add page displaying JVM process metrics | Major | Operability, UI |
| [HBASE-17928](https://issues.apache.org/jira/browse/HBASE-17928) | Shell tool to clear compaction queues | Major | Compaction, Operability |
| [HBASE-18226](https://issues.apache.org/jira/browse/HBASE-18226) | Disable reverse DNS lookup at HMaster and use the hostname provided by RegionServer | Major | . |
| [HBASE-13784](https://issues.apache.org/jira/browse/HBASE-13784) | Add Async Client Table API | Major | . |
| [HBASE-17849](https://issues.apache.org/jira/browse/HBASE-17849) | PE tool random read is not totally random | Major | Performance, test |
| [HBASE-15576](https://issues.apache.org/jira/browse/HBASE-15576) | Scanning cursor to prevent blocking long time on ResultScanner.next() | Major | . |
| [HBASE-16961](https://issues.apache.org/jira/browse/HBASE-16961) | FileSystem Quotas | Major | . |
| [HBASE-17757](https://issues.apache.org/jira/browse/HBASE-17757) | Unify blocksize after encoding to decrease memory fragment | Major | . |
| [HBASE-17542](https://issues.apache.org/jira/browse/HBASE-17542) | Move backup system table into separate namespace | Major | . |
| [HBASE-14141](https://issues.apache.org/jira/browse/HBASE-14141) | HBase Backup/Restore Phase 3: Filter WALs on backup to include only edits from backed up tables | Blocker | . |
| [HBASE-17758](https://issues.apache.org/jira/browse/HBASE-17758) | [RSGROUP] Add shell command to move servers and tables at the same time | Major | rsgroup |
| [HBASE-17737](https://issues.apache.org/jira/browse/HBASE-17737) | Thrift2 proxy should support scan timeRange per column family | Major | Thrift |
| [HBASE-16981](https://issues.apache.org/jira/browse/HBASE-16981) | Expand Mob Compaction Partition policy from daily to weekly, monthly | Major | mob |
| [HBASE-9774](https://issues.apache.org/jira/browse/HBASE-9774) | HBase native metrics and metric collection for coprocessors | Major | Coprocessors, metrics |
| [HBASE-17174](https://issues.apache.org/jira/browse/HBASE-17174) | Refactor the AsyncProcess, BufferedMutatorImpl, and HTable | Minor | . |
| [HBASE-15432](https://issues.apache.org/jira/browse/HBASE-15432) | TableInputFormat - support multi column family scan | Major | . |
| [HBASE-17181](https://issues.apache.org/jira/browse/HBASE-17181) | Let HBase thrift2 support TThreadedSelectorServer | Minor | Thrift |
| [HBASE-17151](https://issues.apache.org/jira/browse/HBASE-17151) | New API to create HFile.Reader without instantiating block cache | Major | . |
| [HBASE-16463](https://issues.apache.org/jira/browse/HBASE-16463) | Improve transparent table/CF encryption with Commons Crypto | Major | encryption |
| [HBASE-16751](https://issues.apache.org/jira/browse/HBASE-16751) | Add tuning information to HBase Book | Minor | . |
| [HBASE-16677](https://issues.apache.org/jira/browse/HBASE-16677) | Add table size (total store file size) to table page | Minor | website |
| [HBASE-16447](https://issues.apache.org/jira/browse/HBASE-16447) | Replication by namespaces config in peer | Critical | Replication |
| [HBASE-16388](https://issues.apache.org/jira/browse/HBASE-16388) | Prevent client threads being blocked by only one slow region server | Major | . |
| [HBASE-16213](https://issues.apache.org/jira/browse/HBASE-16213) | A new HFileBlock structure for fast random get | Major | Performance |
| [HBASE-12721](https://issues.apache.org/jira/browse/HBASE-12721) | Create Docker container cluster infrastructure to enable better testing | Major | build, community, documentation, test |
| [HBASE-3727](https://issues.apache.org/jira/browse/HBASE-3727) | MultiHFileOutputFormat | Minor | . |
| [HBASE-15881](https://issues.apache.org/jira/browse/HBASE-15881) | Allow BZIP2 compression | Major | HFile |
| [HBASE-10358](https://issues.apache.org/jira/browse/HBASE-10358) | Shell changes for setting consistency per request | Major | shell |
| [HBASE-15892](https://issues.apache.org/jira/browse/HBASE-15892) | submit-patch.py: Single command line to make patch, upload it to jira, and update review board | Trivial | . |
| [HBASE-15228](https://issues.apache.org/jira/browse/HBASE-15228) | Add the methods to RegionObserver to trigger start/complete restoring WALs | Major | Coprocessors |
| [HBASE-15847](https://issues.apache.org/jira/browse/HBASE-15847) | VerifyReplication prefix filtering | Major | Replication |
| [HBASE-15798](https://issues.apache.org/jira/browse/HBASE-15798) | Add Async RpcChannels to all RpcClients | Major | . |
| [HBASE-15281](https://issues.apache.org/jira/browse/HBASE-15281) | Allow the FileSystem inside HFileSystem to be wrapped | Major | Filesystem Integration, hbase |
| [HBASE-15592](https://issues.apache.org/jira/browse/HBASE-15592) | Print Procedure WAL content | Major | . |
| [HBASE-6721](https://issues.apache.org/jira/browse/HBASE-6721) | RegionServer Group based Assignment | Major | regionserver |
| [HBASE-15136](https://issues.apache.org/jira/browse/HBASE-15136) | Explore different queuing behaviors while busy | Critical | IPC/RPC |
| [HBASE-15181](https://issues.apache.org/jira/browse/HBASE-15181) | A simple implementation of date based tiered compaction | Major | Compaction |
| [HBASE-13259](https://issues.apache.org/jira/browse/HBASE-13259) | mmap() based BucketCache IOEngine | Critical | BlockCache |
| [HBASE-15135](https://issues.apache.org/jira/browse/HBASE-15135) | Add metrics for storefile age | Major | . |
| [HBASE-14355](https://issues.apache.org/jira/browse/HBASE-14355) | Scan different TimeRange for each column family | Major | Client, regionserver, Scanners |
| [HBASE-11262](https://issues.apache.org/jira/browse/HBASE-11262) | Avoid empty columns while doing bulk-load | Major | . |
| [HBASE-15036](https://issues.apache.org/jira/browse/HBASE-15036) | Update HBase Spark documentation to include bulk load with thin records | Major | . |
| [HBASE-14980](https://issues.apache.org/jira/browse/HBASE-14980) | Project Astro | Major | documentation |
| [HBASE-13153](https://issues.apache.org/jira/browse/HBASE-13153) | Bulk Loaded HFile Replication | Major | Replication |
| [HBASE-12911](https://issues.apache.org/jira/browse/HBASE-12911) | Client-side metrics | Major | Client, Operability, Performance |
| [HBASE-14529](https://issues.apache.org/jira/browse/HBASE-14529) | Respond to SIGHUP to reload config | Major | Operability |
| [HBASE-14459](https://issues.apache.org/jira/browse/HBASE-14459) | Add request and response sizes metrics | Major | metrics |
| [HBASE-14456](https://issues.apache.org/jira/browse/HBASE-14456) | Implement a namespace-based region grouping strategy for RegionGroupingProvider | Major | . |
| [HBASE-14154](https://issues.apache.org/jira/browse/HBASE-14154) | DFS Replication should be configurable at column family level | Minor | . |
| [HBASE-13702](https://issues.apache.org/jira/browse/HBASE-13702) | ImportTsv: Add dry-run functionality and log bad rows | Major | . |
| [HBASE-13639](https://issues.apache.org/jira/browse/HBASE-13639) | SyncTable - rsync for HBase tables | Major | mapreduce, Operability, tooling |
| [HBASE-10070](https://issues.apache.org/jira/browse/HBASE-10070) | HBase read high-availability using timeline-consistent region replicas | Major | Admin, API, LatencyResilience |
| [HBASE-13356](https://issues.apache.org/jira/browse/HBASE-13356) | HBase should provide an InputFormat supporting multiple scans in mapreduce jobs over snapshots | Minor | mapreduce |
| [HBASE-5980](https://issues.apache.org/jira/browse/HBASE-5980) | Scanner responses from RS should include metrics on rows/KVs filtered | Minor | Client, metrics, Operability, regionserver |
| [HBASE-13698](https://issues.apache.org/jira/browse/HBASE-13698) | Add RegionLocator methods to Thrift2 proxy. | Major | Thrift |
| [HBASE-13071](https://issues.apache.org/jira/browse/HBASE-13071) | Hbase Streaming Scan Feature | Major | . |
| [HBASE-13090](https://issues.apache.org/jira/browse/HBASE-13090) | Progress heartbeats for long running scanners | Major | . |
| [HBASE-13412](https://issues.apache.org/jira/browse/HBASE-13412) | Region split decisions should have jitter | Major | regionserver |
| [HBASE-12972](https://issues.apache.org/jira/browse/HBASE-12972) | Region, a supportable public/evolving subset of HRegion | Major | . |
| [HBASE-13170](https://issues.apache.org/jira/browse/HBASE-13170) | Allow block cache to be external | Major | io |
| [HBASE-5238](https://issues.apache.org/jira/browse/HBASE-5238) | Add a log4j category for all edits to META/ROOT | Minor | regionserver |
| [HBASE-13063](https://issues.apache.org/jira/browse/HBASE-13063) | Allow to turn off memstore replication for region replicas | Minor | regionserver, Replication |
| [HBASE-13057](https://issues.apache.org/jira/browse/HBASE-13057) | Provide client utility to easily enable and disable table replication | Major | Replication |
| [HBASE-12869](https://issues.apache.org/jira/browse/HBASE-12869) | Add a REST API implementation of the ClusterManager interface | Major | integration tests |
| [HBASE-12944](https://issues.apache.org/jira/browse/HBASE-12944) | Support patches to branches in precommit jenkins build | Major | . |
| [HBASE-12268](https://issues.apache.org/jira/browse/HBASE-12268) | Add support for Scan.setRowPrefixFilter to shell | Major | shell |
| [HBASE-5162](https://issues.apache.org/jira/browse/HBASE-5162) | Basic client pushback mechanism | Major | . |
### IMPROVEMENTS:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-19994](https://issues.apache.org/jira/browse/HBASE-19994) | Create a new class for RPC throttling exception, make it retryable. | Major | . |
| [HBASE-20409](https://issues.apache.org/jira/browse/HBASE-20409) | Set hbase.client.meta.operation.timeout in TestClientOperationTimeout | Trivial | test |
| [HBASE-17449](https://issues.apache.org/jira/browse/HBASE-17449) | Add explicit document on different timeout settings | Critical | documentation |
| [HBASE-18784](https://issues.apache.org/jira/browse/HBASE-18784) | Use of filesystem that requires hflush / hsync / append / etc should query outputstream capabilities | Major | Filesystem Integration |
| [HBASE-15466](https://issues.apache.org/jira/browse/HBASE-15466) | precommit should not run all java goals when given a docs-only patch | Major | build |
| [HBASE-20135](https://issues.apache.org/jira/browse/HBASE-20135) | NullPointerException during reading bloom filter when upgraded from hbase-1 to hbase-2 | Minor | . |
| [HBASE-17165](https://issues.apache.org/jira/browse/HBASE-17165) | Add retry to LoadIncrementalHFiles tool | Critical | hbase, HFile, tooling |
| [HBASE-18467](https://issues.apache.org/jira/browse/HBASE-18467) | nightly job needs to run all stages and then comment on jira | Critical | community, test |
| [HBASE-17448](https://issues.apache.org/jira/browse/HBASE-17448) | Export metrics from RecoverableZooKeeper | Major | Zookeeper |
| [HBASE-20055](https://issues.apache.org/jira/browse/HBASE-20055) | Remove declaration of un-thrown exceptions and unused setRegionStateBackToOpen() from MergeTableRegionsProcedure | Minor | amv2 |
| [HBASE-18020](https://issues.apache.org/jira/browse/HBASE-18020) | Update API Compliance Checker to Incorporate Improvements Done in Hadoop | Major | API, community |
| [HBASE-20065](https://issues.apache.org/jira/browse/HBASE-20065) | Revisit the timestamp usage in MetaTableAccessor | Major | . |
| [HBASE-18294](https://issues.apache.org/jira/browse/HBASE-18294) | Reduce global heap pressure: flush based on heap occupancy | Major | . |
| [HBASE-19680](https://issues.apache.org/jira/browse/HBASE-19680) | BufferedMutatorImpl#mutate should wait the result from AP in order to throw the failed mutations | Major | . |
| [HBASE-19988](https://issues.apache.org/jira/browse/HBASE-19988) | HRegion#lockRowsAndBuildMiniBatch() is too chatty when interrupted while waiting for a row lock | Minor | amv2 |
| [HBASE-19915](https://issues.apache.org/jira/browse/HBASE-19915) | From split/ merge procedures daughter/ merged regions get created in OFFLINE state | Major | . |
| [HBASE-19917](https://issues.apache.org/jira/browse/HBASE-19917) | Improve RSGroupBasedLoadBalancer#filterServers() to be more efficient | Minor | rsgroup |
| [HBASE-19904](https://issues.apache.org/jira/browse/HBASE-19904) | Break dependency of WAL constructor on Replication | Major | Replication, wal |
| [HBASE-19912](https://issues.apache.org/jira/browse/HBASE-19912) | The flag "writeToWAL" of Region#checkAndRowMutate is useless | Minor | . |
| [HBASE-19861](https://issues.apache.org/jira/browse/HBASE-19861) | Avoid using RPCs when querying table infos for master status pages | Major | UI |
| [HBASE-19770](https://issues.apache.org/jira/browse/HBASE-19770) | Add '--return-values' option to Shell to print return values of commands in interactive mode | Critical | shell |
| [HBASE-19823](https://issues.apache.org/jira/browse/HBASE-19823) | Make RawCellBuilderFactory LimitedPrivate.UNITTEST | Minor | . |
| [HBASE-19820](https://issues.apache.org/jira/browse/HBASE-19820) | Restore public constructor of MiniHBaseCluster (API compat) | Major | . |
| [HBASE-19736](https://issues.apache.org/jira/browse/HBASE-19736) | Remove BaseLogCleanerDelegate deprecated #isLogDeletable(FileStatus) and use #isFileDeletable(FileStatus) instead | Minor | . |
| [HBASE-19739](https://issues.apache.org/jira/browse/HBASE-19739) | Include thrift IDL files in HBase binary distribution | Minor | Thrift |
| [HBASE-19789](https://issues.apache.org/jira/browse/HBASE-19789) | Not exclude flaky tests from nightly builds | Major | . |
| [HBASE-19758](https://issues.apache.org/jira/browse/HBASE-19758) | Split TestHCM to several smaller tests | Major | test |
| [HBASE-19751](https://issues.apache.org/jira/browse/HBASE-19751) | Use RegionInfo directly instead of an identifier and a namespace when getting WAL | Major | wal |
| [HBASE-19139](https://issues.apache.org/jira/browse/HBASE-19139) | Create Async Admin methods for Clear Block Cache | Major | Admin |
| [HBASE-19702](https://issues.apache.org/jira/browse/HBASE-19702) | Improve RSGroupInfo constructors | Minor | . |
| [HBASE-19684](https://issues.apache.org/jira/browse/HBASE-19684) | BlockCacheKey toString Performance | Trivial | hbase |
| [HBASE-19358](https://issues.apache.org/jira/browse/HBASE-19358) | Improve the stability of splitting log when do fail over | Major | MTTR |
| [HBASE-19723](https://issues.apache.org/jira/browse/HBASE-19723) | hbase-thrift declares slf4j-api twice | Trivial | Thrift |
| [HBASE-19651](https://issues.apache.org/jira/browse/HBASE-19651) | Remove LimitInputStream | Minor | hbase |
| [HBASE-19473](https://issues.apache.org/jira/browse/HBASE-19473) | Miscellaneous changes to ClientScanner | Trivial | hbase |
| [HBASE-19613](https://issues.apache.org/jira/browse/HBASE-19613) | Miscellaneous changes to WALSplitter | Trivial | hbase |
| [HBASE-18806](https://issues.apache.org/jira/browse/HBASE-18806) | VerifyRep by snapshot need not to restore snapshot for each mapper | Major | Replication |
| [HBASE-18011](https://issues.apache.org/jira/browse/HBASE-18011) | Refactor RpcServer | Major | IPC/RPC |
| [HBASE-19641](https://issues.apache.org/jira/browse/HBASE-19641) | AsyncHBaseAdmin should use exponential backoff when polling the procedure result | Major | asyncclient, proc-v2 |
| [HBASE-19675](https://issues.apache.org/jira/browse/HBASE-19675) | Miscellaneous HStore Class Improvements | Minor | hbase |
| [HBASE-19683](https://issues.apache.org/jira/browse/HBASE-19683) | Remove Superfluous Methods From String Class | Trivial | hbase |
| [HBASE-19676](https://issues.apache.org/jira/browse/HBASE-19676) | CleanerChore logging improvements | Trivial | hbase |
| [HBASE-19486](https://issues.apache.org/jira/browse/HBASE-19486) | Periodically ensure records are not buffered too long by BufferedMutator | Major | Client |
| [HBASE-19679](https://issues.apache.org/jira/browse/HBASE-19679) | Superusers Logging and Data Structures | Trivial | hbase |
| [HBASE-19677](https://issues.apache.org/jira/browse/HBASE-19677) | Miscellaneous HFileCleaner Improvements | Trivial | hbase |
| [HBASE-19649](https://issues.apache.org/jira/browse/HBASE-19649) | Use singleton feature for ImmutableSegment | Trivial | . |
| [HBASE-8518](https://issues.apache.org/jira/browse/HBASE-8518) | Get rid of hbase.hstore.compaction.complete setting | Minor | . |
| [HBASE-19659](https://issues.apache.org/jira/browse/HBASE-19659) | Enable -x in make\_rc.sh so logs where it is in execution | Trivial | build |
| [HBASE-19647](https://issues.apache.org/jira/browse/HBASE-19647) | Logging cleanups; emit regionname when RegionTooBusyException inside RetriesExhausted... make netty connect/disconnect TRACE-level | Major | . |
| [HBASE-19545](https://issues.apache.org/jira/browse/HBASE-19545) | Replace getBytes(StandardCharsets.UTF\_8) with Bytes.toBytes | Minor | . |
| [HBASE-19615](https://issues.apache.org/jira/browse/HBASE-19615) | CompositeImmutableSegment ArrayList Instead of LinkedList | Trivial | hbase |
| [HBASE-19621](https://issues.apache.org/jira/browse/HBASE-19621) | Revisit the methods in ReplicationPeerConfigBuilder | Minor | . |
| [HBASE-19618](https://issues.apache.org/jira/browse/HBASE-19618) | Remove replicationQueuesClient.class/replicationQueues.class config and remove table based ReplicationQueuesClient/ReplicationQueues implementation | Major | . |
| [HBASE-19576](https://issues.apache.org/jira/browse/HBASE-19576) | Introduce builder for ReplicationPeerConfig and make it immutable | Major | . |
| [HBASE-19590](https://issues.apache.org/jira/browse/HBASE-19590) | Remove the duplicate code in deprecated ReplicationAdmin | Minor | . |
| [HBASE-19570](https://issues.apache.org/jira/browse/HBASE-19570) | Add hadoop3 tests to Nightly master/branch-2 runs | Critical | . |
| [HBASE-19571](https://issues.apache.org/jira/browse/HBASE-19571) | Minor refactor of Nightly run scripts | Minor | . |
| [HBASE-19491](https://issues.apache.org/jira/browse/HBASE-19491) | Exclude flaky tests from nightly master run | Major | . |
| [HBASE-15482](https://issues.apache.org/jira/browse/HBASE-15482) | Provide an option to skip calculating block locations for SnapshotInputFormat | Minor | mapreduce |
| [HBASE-19531](https://issues.apache.org/jira/browse/HBASE-19531) | Remove needless volatile declaration | Trivial | . |
| [HBASE-19521](https://issues.apache.org/jira/browse/HBASE-19521) | HBase mob compaction need to check hfile version | Critical | Compaction, mob |
| [HBASE-14790](https://issues.apache.org/jira/browse/HBASE-14790) | Implement a new DFSOutputStream for logging WAL only | Major | wal |
| [HBASE-19472](https://issues.apache.org/jira/browse/HBASE-19472) | Remove ArrayUtil Class | Major | hbase |
| [HBASE-19489](https://issues.apache.org/jira/browse/HBASE-19489) | Check against only the latest maintenance release in pre-commit hadoopcheck. | Minor | . |
| [HBASE-17425](https://issues.apache.org/jira/browse/HBASE-17425) | Fix calls to deprecated APIs in TestUpdateConfiguration | Trivial | Client |
| [HBASE-19464](https://issues.apache.org/jira/browse/HBASE-19464) | Replace StringBuffer with StringBuilder for hbase-common | Trivial | hbase |
| [HBASE-19463](https://issues.apache.org/jira/browse/HBASE-19463) | Make CPEnv#getConnection return a facade that throws Unsupported if CP calls #close | Major | Coprocessors |
| [HBASE-19180](https://issues.apache.org/jira/browse/HBASE-19180) | Remove unused imports from AlwaysPasses | Trivial | build |
| [HBASE-18169](https://issues.apache.org/jira/browse/HBASE-18169) | Coprocessor fix and cleanup before 2.0.0 release | Blocker | Coprocessors |
| [HBASE-19448](https://issues.apache.org/jira/browse/HBASE-19448) | Replace StringBuffer with StringBuilder for hbase-server | Trivial | hbase |
| [HBASE-19432](https://issues.apache.org/jira/browse/HBASE-19432) | Roll the specified writer in HFileOutputFormat2 | Major | . |
| [HBASE-19290](https://issues.apache.org/jira/browse/HBASE-19290) | Reduce zk request when doing split log | Major | . |
| [HBASE-19336](https://issues.apache.org/jira/browse/HBASE-19336) | Improve rsgroup to allow assign all tables within a specified namespace by only writing namespace | Major | rsgroup |
| [HBASE-19367](https://issues.apache.org/jira/browse/HBASE-19367) | Refactoring in RegionStates, and RSProcedureDispatcher | Minor | . |
| [HBASE-19382](https://issues.apache.org/jira/browse/HBASE-19382) | Update report-flakies.py script to handle yetus builds | Major | . |
| [HBASE-19252](https://issues.apache.org/jira/browse/HBASE-19252) | Move the transform logic of FilterList into transformCell() method to avoid extra ref to question cell | Minor | . |
| [HBASE-19372](https://issues.apache.org/jira/browse/HBASE-19372) | Remove the Span object in SyncFuture as it is useless now | Major | tracing, wal |
| [HBASE-18090](https://issues.apache.org/jira/browse/HBASE-18090) | Improve TableSnapshotInputFormat to allow more multiple mappers per region | Major | mapreduce |
| [HBASE-16868](https://issues.apache.org/jira/browse/HBASE-16868) | Add a replicate\_all flag to avoid misuse the namespaces and table-cfs config of replication peer | Critical | Replication |
| [HBASE-19311](https://issues.apache.org/jira/browse/HBASE-19311) | Promote TestAcidGuarantees to LargeTests and start mini cluster once to make it faster | Major | test |
| [HBASE-19293](https://issues.apache.org/jira/browse/HBASE-19293) | Support adding a new replication peer in disabled state | Major | . |
| [HBASE-16574](https://issues.apache.org/jira/browse/HBASE-16574) | Add backup / restore feature to refguide | Major | . |
| [HBASE-19274](https://issues.apache.org/jira/browse/HBASE-19274) | Log IOException when unable to determine the size of committed file | Trivial | . |
| [HBASE-19251](https://issues.apache.org/jira/browse/HBASE-19251) | Merge RawAsyncTable and AsyncTable | Major | asyncclient, Client |
| [HBASE-19262](https://issues.apache.org/jira/browse/HBASE-19262) | Revisit checkstyle rules | Major | build |
| [HBASE-18601](https://issues.apache.org/jira/browse/HBASE-18601) | Update Htrace to 4.2 | Major | dependencies, tracing |
| [HBASE-19227](https://issues.apache.org/jira/browse/HBASE-19227) | Nightly jobs should archive JVM dumpstream files | Critical | build |
| [HBASE-12350](https://issues.apache.org/jira/browse/HBASE-12350) | Backport error-prone build support to branch-1 and branch-2 | Minor | . |
| [HBASE-19228](https://issues.apache.org/jira/browse/HBASE-19228) | nightly job should gather machine stats. | Major | build |
| [HBASE-19186](https://issues.apache.org/jira/browse/HBASE-19186) | Unify to use bytes to show size in master/rs ui | Minor | . |
| [HBASE-19027](https://issues.apache.org/jira/browse/HBASE-19027) | Honor the CellComparator of ScanInfo in scanning over a store | Major | . |
| [HBASE-13622](https://issues.apache.org/jira/browse/HBASE-13622) | document upgrade rollback | Major | documentation |
| [HBASE-18925](https://issues.apache.org/jira/browse/HBASE-18925) | Need updated mockito for using java optional | Major | . |
| [HBASE-19140](https://issues.apache.org/jira/browse/HBASE-19140) | hbase-cleanup.sh uses deprecated call to remove files in hdfs | Trivial | scripts |
| [HBASE-17065](https://issues.apache.org/jira/browse/HBASE-17065) | Perform more effective sorting for RPC Handler Tasks | Minor | . |
| [HBASE-18870](https://issues.apache.org/jira/browse/HBASE-18870) | Hbase Backup should set the details to MR job name | Minor | . |
| [HBASE-18602](https://issues.apache.org/jira/browse/HBASE-18602) | rsgroup cleanup unassign code | Minor | rsgroup |
| [HBASE-19110](https://issues.apache.org/jira/browse/HBASE-19110) | Add default for Server#isStopping & #getFileSystem | Minor | . |
| [HBASE-19091](https://issues.apache.org/jira/browse/HBASE-19091) | Code annotation wrote "BinaryComparator" instead of "LongComparator" | Minor | Client |
| [HBASE-18994](https://issues.apache.org/jira/browse/HBASE-18994) | Decide if META/System tables should use Compacting Memstore or Default Memstore | Major | . |
| [HBASE-19051](https://issues.apache.org/jira/browse/HBASE-19051) | Add new split algorithm for num string | Minor | . |
| [HBASE-18824](https://issues.apache.org/jira/browse/HBASE-18824) | Add meaningful comment to HConstants.LATEST\_TIMESTAMP to explain why it is MAX\_VALUE | Minor | . |
| [HBASE-10367](https://issues.apache.org/jira/browse/HBASE-10367) | RegionServer graceful stop / decommissioning | Major | . |
| [HBASE-18986](https://issues.apache.org/jira/browse/HBASE-18986) | Remove unnecessary null check after CellUtil.cloneQualifier() | Minor | . |
| [HBASE-15410](https://issues.apache.org/jira/browse/HBASE-15410) | Utilize the max seek value when all Filters in MUST\_PASS\_ALL FilterList return SEEK\_NEXT\_USING\_HINT | Major | . |
| [HBASE-18843](https://issues.apache.org/jira/browse/HBASE-18843) | Add DistCp support to incremental backup with bulk loading | Major | . |
| [HBASE-16010](https://issues.apache.org/jira/browse/HBASE-16010) | Put draining function through Admin API | Minor | . |
| [HBASE-18899](https://issues.apache.org/jira/browse/HBASE-18899) | Make Fileinfo more readable in HFilePrettyPrinter | Major | HFile |
| [HBASE-16894](https://issues.apache.org/jira/browse/HBASE-16894) | Create more than 1 split per region, generalize HBASE-12590 | Major | . |
| [HBASE-18929](https://issues.apache.org/jira/browse/HBASE-18929) | Hbase backup command doesn’t show debug option to enable backup in debug mode | Minor | . |
| [HBASE-18814](https://issues.apache.org/jira/browse/HBASE-18814) | Make ScanMetrics enabled and add counter \<HBase Counters, ROWS\_SCANNED\> into the MapReduce Job over snapshot | Minor | mapreduce |
| [HBASE-18559](https://issues.apache.org/jira/browse/HBASE-18559) | Add histogram to MetricsConnection to track concurrent calls per server | Minor | Client |
| [HBASE-18436](https://issues.apache.org/jira/browse/HBASE-18436) | Add client-side hedged read metrics | Minor | . |
| [HBASE-13844](https://issues.apache.org/jira/browse/HBASE-13844) | Move static helper methods from KeyValue into CellUtils | Minor | . |
| [HBASE-18884](https://issues.apache.org/jira/browse/HBASE-18884) | Coprocessor Design Improvements follow up of HBASE-17732 | Major | Coprocessors |
| [HBASE-18652](https://issues.apache.org/jira/browse/HBASE-18652) | Expose individual cache stats in a CombinedCache through JMX | Major | regionserver |
| [HBASE-18651](https://issues.apache.org/jira/browse/HBASE-18651) | Let ChaosMonkeyRunner expose the chaos monkey runner it creates | Major | . |
| [HBASE-11462](https://issues.apache.org/jira/browse/HBASE-11462) | MetaTableAccessor shouldn't use ZooKeeeper | Major | Client, Zookeeper |
| [HBASE-18478](https://issues.apache.org/jira/browse/HBASE-18478) | Allow users to remove RegionFinder from LoadBalancer calculations if no locality possible | Major | Balancer |
| [HBASE-18849](https://issues.apache.org/jira/browse/HBASE-18849) | expand "thirdparty" reference to give examples of setting netty location in common testing modules | Critical | documentation, thirdparty |
| [HBASE-18609](https://issues.apache.org/jira/browse/HBASE-18609) | Apply ClusterStatus#getClusterStatus(EnumSet\<Option\>) in code base | Major | . |
| [HBASE-18795](https://issues.apache.org/jira/browse/HBASE-18795) | Expose KeyValue.getBuffer() for tests alone | Major | . |
| [HBASE-18772](https://issues.apache.org/jira/browse/HBASE-18772) | [JDK8] Replace AtomicLong with LongAdder | Trivial | . |
| [HBASE-14996](https://issues.apache.org/jira/browse/HBASE-14996) | Some more API cleanup for 2.0 | Blocker | . |
| [HBASE-18683](https://issues.apache.org/jira/browse/HBASE-18683) | Upgrade hbase to commons-math 3 | Major | . |
| [HBASE-13271](https://issues.apache.org/jira/browse/HBASE-13271) | Table#puts(List\<Put\>) operation is indeterminate; needs fixing | Critical | API |
| [HBASE-10240](https://issues.apache.org/jira/browse/HBASE-10240) | Remove 0.94-\>0.96 migration code | Critical | . |
| [HBASE-18662](https://issues.apache.org/jira/browse/HBASE-18662) | The default values for many configuration items in the code are not consistent with hbase-default.xml | Minor | . |
| [HBASE-18621](https://issues.apache.org/jira/browse/HBASE-18621) | Refactor ClusterOptions before applying to code base | Major | . |
| [HBASE-18778](https://issues.apache.org/jira/browse/HBASE-18778) | Use Comparator for StealJobQueue | Major | Compaction |
| [HBASE-18737](https://issues.apache.org/jira/browse/HBASE-18737) | Display configured max size of memstore and cache on RS UI | Minor | . |
| [HBASE-18674](https://issues.apache.org/jira/browse/HBASE-18674) | upgrade hbase to commons-lang3 | Major | . |
| [HBASE-18746](https://issues.apache.org/jira/browse/HBASE-18746) | Throw exception with job.getStatus().getFailureInfo() when ExportSnapshot fails | Minor | mapreduce, snapshots |
| [HBASE-18740](https://issues.apache.org/jira/browse/HBASE-18740) | Upgrade Zookeeper version to 3.4.10 | Major | . |
| [HBASE-18699](https://issues.apache.org/jira/browse/HBASE-18699) | Copy LoadIncrementalHFiles to another package and mark the old one as deprecated | Major | mapreduce |
| [HBASE-18675](https://issues.apache.org/jira/browse/HBASE-18675) | Making {max,min}SessionTimeout configurable for MiniZooKeeperCluster | Minor | test, Zookeeper |
| [HBASE-17826](https://issues.apache.org/jira/browse/HBASE-17826) | Backup: submit M/R job to a particular Yarn queue | Major | . |
| [HBASE-18677](https://issues.apache.org/jira/browse/HBASE-18677) | typo in namespace docs | Trivial | documentation |
| [HBASE-18701](https://issues.apache.org/jira/browse/HBASE-18701) | Optimize reference guide to use cell acl conveniently | Trivial | . |
| [HBASE-18519](https://issues.apache.org/jira/browse/HBASE-18519) | Use builder pattern to create cell | Major | . |
| [HBASE-18673](https://issues.apache.org/jira/browse/HBASE-18673) | Some more unwanted reference to unshaded PB classes | Minor | . |
| [HBASE-18224](https://issues.apache.org/jira/browse/HBASE-18224) | Upgrade jetty | Critical | dependencies |
| [HBASE-18532](https://issues.apache.org/jira/browse/HBASE-18532) | Improve cache related stats rendered on RS UI | Major | regionserver, UI |
| [HBASE-18629](https://issues.apache.org/jira/browse/HBASE-18629) | Enhance ChaosMonkeyRunner with interruptibility | Major | . |
| [HBASE-18631](https://issues.apache.org/jira/browse/HBASE-18631) | Allow configuration of ChaosMonkey properties via hbase-site | Minor | integration tests |
| [HBASE-18573](https://issues.apache.org/jira/browse/HBASE-18573) | Update Append and Delete to use Mutation#getCellList(family) | Minor | . |
| [HBASE-18251](https://issues.apache.org/jira/browse/HBASE-18251) | Remove unnecessary traversing to the first and last keys in the CellSet | Major | . |
| [HBASE-18581](https://issues.apache.org/jira/browse/HBASE-18581) | Remove dead code and some tidy up in BaseLoadBalancer | Minor | Balancer |
| [HBASE-18504](https://issues.apache.org/jira/browse/HBASE-18504) | Add documentation for WAL compression | Minor | documentation |
| [HBASE-17064](https://issues.apache.org/jira/browse/HBASE-17064) | Add TaskMonitor#getTasks() variant which accepts type selection | Minor | . |
| [HBASE-2631](https://issues.apache.org/jira/browse/HBASE-2631) | Decide between "InMB" and "MB" as suffix for field names in ClusterStatus objects | Minor | . |
| [HBASE-18533](https://issues.apache.org/jira/browse/HBASE-18533) | Expose BucketCache values to be configured | Major | BucketCache |
| [HBASE-18303](https://issues.apache.org/jira/browse/HBASE-18303) | Clean up some parameterized test declarations | Minor | test |
| [HBASE-18522](https://issues.apache.org/jira/browse/HBASE-18522) | Add RowMutations support to Batch | Major | . |
| [HBASE-18566](https://issues.apache.org/jira/browse/HBASE-18566) | [RSGROUP]Log the client IP/port of the rsgroup admin | Major | rsgroup |
| [HBASE-15511](https://issues.apache.org/jira/browse/HBASE-15511) | ClusterStatus should be able to return responses by scope | Major | . |
| [HBASE-18555](https://issues.apache.org/jira/browse/HBASE-18555) | Remove redundant familyMap.put() from addxxx() of sub-classes of Mutation and Query | Minor | Client |
| [HBASE-18387](https://issues.apache.org/jira/browse/HBASE-18387) | [Thrift] Make principal configurable in DemoClient.java | Minor | . |
| [HBASE-18548](https://issues.apache.org/jira/browse/HBASE-18548) | Move sources of important Jenkins jobs into source control | Critical | documentation, scripts |
| [HBASE-18248](https://issues.apache.org/jira/browse/HBASE-18248) | Warn if monitored RPC task has been tied up beyond a configurable threshold | Major | . |
| [HBASE-18485](https://issues.apache.org/jira/browse/HBASE-18485) | Performance issue: ClientAsyncPrefetchScanner is slower than ClientSimpleScanner | Major | . |
| [HBASE-18426](https://issues.apache.org/jira/browse/HBASE-18426) | nightly job should use independent stages to check supported jdks | Critical | community, test |
| [HBASE-14220](https://issues.apache.org/jira/browse/HBASE-14220) | nightly tests should verify src tgz generates and builds correctly | Minor | build |
| [HBASE-18520](https://issues.apache.org/jira/browse/HBASE-18520) | Add jmx value to determine true Master Start time | Minor | metrics |
| [HBASE-16893](https://issues.apache.org/jira/browse/HBASE-16893) | Use Collection.removeIf instead of Iterator.remove in DependentColumnFilter | Minor | . |
| [HBASE-16116](https://issues.apache.org/jira/browse/HBASE-16116) | Remove redundant pattern \*.iml | Trivial | . |
| [HBASE-18261](https://issues.apache.org/jira/browse/HBASE-18261) | [AMv2] Create new RecoverMetaProcedure and use it from ServerCrashProcedure and HMaster.finishActiveMasterInitialization() | Major | amv2 |
| [HBASE-18402](https://issues.apache.org/jira/browse/HBASE-18402) | Thrift2 should support DeleteFamilyVersion type | Major | Thrift |
| [HBASE-18434](https://issues.apache.org/jira/browse/HBASE-18434) | Address some alerts raised by lgtm.com | Major | . |
| [HBASE-18023](https://issues.apache.org/jira/browse/HBASE-18023) | Log multi-\* requests for more than threshold number of rows | Minor | regionserver |
| [HBASE-15816](https://issues.apache.org/jira/browse/HBASE-15816) | Provide client with ability to set priority on Operations | Major | . |
| [HBASE-18389](https://issues.apache.org/jira/browse/HBASE-18389) | Remove byte[] from formal parameter of sizeOf() of ClassSize, ClassSize.MemoryLayout and ClassSize.UnsafeLayout | Minor | util |
| [HBASE-18412](https://issues.apache.org/jira/browse/HBASE-18412) | [Shell] Support unset of list of configuration for a table | Minor | . |
| [HBASE-16312](https://issues.apache.org/jira/browse/HBASE-16312) | update jquery version | Critical | dependencies, UI |
| [HBASE-18332](https://issues.apache.org/jira/browse/HBASE-18332) | Upgrade asciidoctor-maven-plugin | Minor | website |
| [HBASE-18339](https://issues.apache.org/jira/browse/HBASE-18339) | Update test-patch to use hadoop 3.0.0-alpha4 | Major | test |
| [HBASE-18004](https://issues.apache.org/jira/browse/HBASE-18004) | getRegionLocations needs to be called once in ScannerCallableWithReplicas#call() | Minor | Client |
| [HBASE-18307](https://issues.apache.org/jira/browse/HBASE-18307) | Share the same EventLoopGroup for NettyRpcServer, NettyRpcClient and AsyncFSWALProvider at RS side | Major | io, rpc, wal |
| [HBASE-18083](https://issues.apache.org/jira/browse/HBASE-18083) | Make large/small file clean thread number configurable in HFileCleaner | Major | . |
| [HBASE-16730](https://issues.apache.org/jira/browse/HBASE-16730) | Exclude junit as a transitive dependency from hadoop-common | Trivial | hbase |
| [HBASE-15062](https://issues.apache.org/jira/browse/HBASE-15062) | IntegrationTestMTTR conditionally run some tests | Minor | integration tests |
| [HBASE-11707](https://issues.apache.org/jira/browse/HBASE-11707) | Using Map instead of list in FailedServers of RpcClient | Minor | Client |
| [HBASE-18286](https://issues.apache.org/jira/browse/HBASE-18286) | Create static empty byte array to save memory | Trivial | community |
| [HBASE-17995](https://issues.apache.org/jira/browse/HBASE-17995) | improve log messages during snapshot related tests | Trivial | integration tests, mapreduce, snapshots, test |
| [HBASE-15391](https://issues.apache.org/jira/browse/HBASE-15391) | Avoid too large "deleted from META" info log | Minor | . |
| [HBASE-16585](https://issues.apache.org/jira/browse/HBASE-16585) | Rewrite the delegation token tests with Parameterized pattern | Major | security, test |
| [HBASE-13197](https://issues.apache.org/jira/browse/HBASE-13197) | Connection API cleanup | Major | API |
| [HBASE-15756](https://issues.apache.org/jira/browse/HBASE-15756) | Pluggable RpcServer | Critical | Performance, rpc |
| [HBASE-17110](https://issues.apache.org/jira/browse/HBASE-17110) | Improve SimpleLoadBalancer to always take server-level balance into account | Major | Balancer |
| [HBASE-18022](https://issues.apache.org/jira/browse/HBASE-18022) | Refine the error message issued with TableNotFoundException when expected table is not the same as the one fetched from meta | Minor | . |
| [HBASE-18281](https://issues.apache.org/jira/browse/HBASE-18281) | Performance update in StoreFileWriter.java for string replacement | Trivial | community |
| [HBASE-18041](https://issues.apache.org/jira/browse/HBASE-18041) | Add pylintrc file to HBase | Major | community |
| [HBASE-18275](https://issues.apache.org/jira/browse/HBASE-18275) | Formatting and grammar mistakes in schemadoc chapter | Trivial | documentation |
| [HBASE-18164](https://issues.apache.org/jira/browse/HBASE-18164) | Much faster locality cost function and candidate generator | Critical | Balancer |
| [HBASE-16351](https://issues.apache.org/jira/browse/HBASE-16351) | do dependency license check via enforcer plugin | Major | build, dependencies |
| [HBASE-18252](https://issues.apache.org/jira/browse/HBASE-18252) | Resolve BaseLoadBalancer bad practice warnings | Minor | . |
| [HBASE-18033](https://issues.apache.org/jira/browse/HBASE-18033) | Update supplemental models for new deps in Hadoop trunk | Critical | dependencies |
| [HBASE-17959](https://issues.apache.org/jira/browse/HBASE-17959) | Canary timeout should be configurable on a per-table basis | Minor | canary |
| [HBASE-17777](https://issues.apache.org/jira/browse/HBASE-17777) | TestMemstoreLAB#testLABThreading runs too long for a small test | Minor | test |
| [HBASE-18101](https://issues.apache.org/jira/browse/HBASE-18101) | Fix type mismatch on container access in QuotaCache#chore | Trivial | . |
| [HBASE-18001](https://issues.apache.org/jira/browse/HBASE-18001) | Extend the "count" shell command to support specified conditions | Minor | shell |
| [HBASE-18094](https://issues.apache.org/jira/browse/HBASE-18094) | Display the return value of the command append | Major | shell |
| [HBASE-18075](https://issues.apache.org/jira/browse/HBASE-18075) | Support namespaces and tables with non-latin alphabetical characters | Major | Client |
| [HBASE-18067](https://issues.apache.org/jira/browse/HBASE-18067) | Support a default converter for data read shell commands | Minor | shell |
| [HBASE-18019](https://issues.apache.org/jira/browse/HBASE-18019) | Close redundant memstore scanners | Major | . |
| [HBASE-17910](https://issues.apache.org/jira/browse/HBASE-17910) | Use separated StoreFileReader for streaming read | Major | regionserver, scan, Scanners |
| [HBASE-18043](https://issues.apache.org/jira/browse/HBASE-18043) | Institute a hard limit for individual cell size that cannot be overridden by clients | Major | IPC/RPC, regionserver |
| [HBASE-17343](https://issues.apache.org/jira/browse/HBASE-17343) | Make Compacting Memstore default in 2.0 with BASIC as the default type | Blocker | regionserver |
| [HBASE-18021](https://issues.apache.org/jira/browse/HBASE-18021) | Add more info in timed out RetriesExhaustedException for read replica client get processing, | Minor | Client |
| [HBASE-18017](https://issues.apache.org/jira/browse/HBASE-18017) | Reduce frequency of setStoragePolicy failure warnings | Minor | . |
| [HBASE-14925](https://issues.apache.org/jira/browse/HBASE-14925) | Develop HBase shell command/tool to list table's region info through command line | Major | shell |
| [HBASE-17924](https://issues.apache.org/jira/browse/HBASE-17924) | Consider sorting the row order when processing multi() ops before taking rowlocks | Major | . |
| [HBASE-18015](https://issues.apache.org/jira/browse/HBASE-18015) | Storage class aware block placement for procedure v2 WALs | Minor | . |
| [HBASE-18007](https://issues.apache.org/jira/browse/HBASE-18007) | Clean up rest module code | Trivial | . |
| [HBASE-17990](https://issues.apache.org/jira/browse/HBASE-17990) | Refactor TestFSUtils to use Before | Trivial | . |
| [HBASE-16466](https://issues.apache.org/jira/browse/HBASE-16466) | HBase snapshots support in VerifyReplication tool to reduce load on live HBase cluster with large tables | Major | hbase |
| [HBASE-12870](https://issues.apache.org/jira/browse/HBASE-12870) | "Major compaction triggered" and "Skipping major compaction" messages lack the region information | Major | Compaction |
| [HBASE-17973](https://issues.apache.org/jira/browse/HBASE-17973) | Create shell command to identify regions with poor locality | Major | shell |
| [HBASE-17979](https://issues.apache.org/jira/browse/HBASE-17979) | HBase Shell 'list' Command Help Doc Improvements | Minor | shell |
| [HBASE-17875](https://issues.apache.org/jira/browse/HBASE-17875) | Document why objects over 10MB are not well-suited for hbase | Major | documentation, mob |
| [HBASE-8486](https://issues.apache.org/jira/browse/HBASE-8486) | IS\_ROOT isnt needed in HTableDescriptor. | Minor | . |
| [HBASE-17817](https://issues.apache.org/jira/browse/HBASE-17817) | Make Regionservers log which tables it removed coprocessors from when aborting | Major | Coprocessors, regionserver |
| [HBASE-17835](https://issues.apache.org/jira/browse/HBASE-17835) | Spelling mistakes in the Java source | Trivial | documentation |
| [HBASE-17962](https://issues.apache.org/jira/browse/HBASE-17962) | Improve documentation on Rest interface | Trivial | documentation, REST |
| [HBASE-17877](https://issues.apache.org/jira/browse/HBASE-17877) | Improve HBase's byte[] comparator | Major | util |
| [HBASE-9899](https://issues.apache.org/jira/browse/HBASE-9899) | for idempotent operation dups, return the result instead of throwing conflict exception | Major | . |
| [HBASE-17514](https://issues.apache.org/jira/browse/HBASE-17514) | Warn when Thrift Server 1 is configured for proxy users but not the HTTP transport | Minor | Thrift, Usability |
| [HBASE-17944](https://issues.apache.org/jira/browse/HBASE-17944) | Removed unused JDK version parsing from ClassSize. | Minor | build |
| [HBASE-17912](https://issues.apache.org/jira/browse/HBASE-17912) | Avoid major compactions on region server startup | Major | Compaction |
| [HBASE-17888](https://issues.apache.org/jira/browse/HBASE-17888) | Add generic methods for updating metrics on start and end of a procedure execution | Major | proc-v2 |
| [HBASE-16469](https://issues.apache.org/jira/browse/HBASE-16469) | Several log refactoring/improvement suggestions | Major | Operability |
| [HBASE-17836](https://issues.apache.org/jira/browse/HBASE-17836) | CellUtil#estimatedSerializedSizeOf is slow when input is ByteBufferCell | Minor | . |
| [HBASE-16969](https://issues.apache.org/jira/browse/HBASE-16969) | RegionCoprocessorServiceExec should override the toString() for debugging | Minor | . |
| [HBASE-17854](https://issues.apache.org/jira/browse/HBASE-17854) | Use StealJobQueue in HFileCleaner after HBASE-17215 | Major | . |
| [HBASE-17215](https://issues.apache.org/jira/browse/HBASE-17215) | Separate small/large file delete threads in HFileCleaner to accelerate archived hfile cleanup speed | Major | . |
| [HBASE-17831](https://issues.apache.org/jira/browse/HBASE-17831) | Support small scan in thrift2 | Major | Thrift |
| [HBASE-17623](https://issues.apache.org/jira/browse/HBASE-17623) | Reuse the bytes array when building the hfile block | Major | HFile |
| [HBASE-17815](https://issues.apache.org/jira/browse/HBASE-17815) | Remove the unused field in PrefixTreeSeeker | Trivial | . |
| [HBASE-17778](https://issues.apache.org/jira/browse/HBASE-17778) | Remove the testing code in the AsyncRequestFutureImpl | Trivial | . |
| [HBASE-15339](https://issues.apache.org/jira/browse/HBASE-15339) | Improve DateTieredCompactionPolicy | Major | Compaction |
| [HBASE-17747](https://issues.apache.org/jira/browse/HBASE-17747) | Support both weak and soft object pool | Major | . |
| [HBASE-15429](https://issues.apache.org/jira/browse/HBASE-15429) | Add a split policy for busy regions | Major | regionserver |
| [HBASE-17731](https://issues.apache.org/jira/browse/HBASE-17731) | Fractional latency reporting in MultiThreadedAction | Trivial | . |
| [HBASE-16977](https://issues.apache.org/jira/browse/HBASE-16977) | VerifyReplication should log a printable representation of the row keys | Minor | Replication |
| [HBASE-15941](https://issues.apache.org/jira/browse/HBASE-15941) | HBCK repair should not unsplit healthy splitted region | Major | hbck |
| [HBASE-17532](https://issues.apache.org/jira/browse/HBASE-17532) | Replace explicit type with diamond operator | Trivial | build |
| [HBASE-17734](https://issues.apache.org/jira/browse/HBASE-17734) | Guard against possibly copying the qualifier in the ScanDeleteTracker | Minor | . |
| [HBASE-17690](https://issues.apache.org/jira/browse/HBASE-17690) | Clean up MOB code | Major | mob |
| [HBASE-16188](https://issues.apache.org/jira/browse/HBASE-16188) | Add EventCounter information to log4j properties file | Minor | . |
| [HBASE-17689](https://issues.apache.org/jira/browse/HBASE-17689) | Add support for table.existsAll in thrift2 THBaseservice | Major | Thrift |
| [HBASE-17634](https://issues.apache.org/jira/browse/HBASE-17634) | Clean up the usage of Result.isPartial | Major | scan |
| [HBASE-17654](https://issues.apache.org/jira/browse/HBASE-17654) | RSGroup code refactoring | Major | rsgroup |
| [HBASE-17057](https://issues.apache.org/jira/browse/HBASE-17057) | Minor compactions should also drop page cache behind reads | Major | Compaction |
| [HBASE-17676](https://issues.apache.org/jira/browse/HBASE-17676) | Get class name once for all in AbstractFSWAL | Major | Performance |
| [HBASE-13718](https://issues.apache.org/jira/browse/HBASE-13718) | Add a pretty printed table description to the table detail page of HBase's master | Minor | hbase |
| [HBASE-17172](https://issues.apache.org/jira/browse/HBASE-17172) | Optimize mob compaction with \_del files | Major | mob |
| [HBASE-17627](https://issues.apache.org/jira/browse/HBASE-17627) | Active workers metric for thrift | Major | Thrift |
| [HBASE-17637](https://issues.apache.org/jira/browse/HBASE-17637) | Update progress more frequently in IntegrationTestBigLinkedList.Generator.persist | Minor | . |
| [HBASE-17605](https://issues.apache.org/jira/browse/HBASE-17605) | Refactor procedure framework code | Major | proc-v2 |
| [HBASE-17280](https://issues.apache.org/jira/browse/HBASE-17280) | Add mechanism to control hbase cleaner behavior | Minor | Client, hbase, shell |
| [HBASE-17613](https://issues.apache.org/jira/browse/HBASE-17613) | avoid copy of family when initializing the FSWALEntry | Minor | . |
| [HBASE-17437](https://issues.apache.org/jira/browse/HBASE-17437) | Support specifying a WAL directory outside of the root directory | Major | Filesystem Integration, wal |
| [HBASE-17592](https://issues.apache.org/jira/browse/HBASE-17592) | Fix typo in IPCUtil and RpcConnection | Trivial | . |
| [HBASE-17588](https://issues.apache.org/jira/browse/HBASE-17588) | Remove unused imports brought in by HBASE-17437 | Trivial | . |
| [HBASE-17552](https://issues.apache.org/jira/browse/HBASE-17552) | Update developer section in hbase book | Major | . |
| [HBASE-17543](https://issues.apache.org/jira/browse/HBASE-17543) | Create additional ReplicationEndpoint WALEntryFilters by configuration | Major | Replication |
| [HBASE-17569](https://issues.apache.org/jira/browse/HBASE-17569) | HBase-Procedure module need to support mvn clean test -PskipProcedureTests to skip unit test | Minor | proc-v2 |
| [HBASE-17555](https://issues.apache.org/jira/browse/HBASE-17555) | Change calls to deprecated getHBaseAdmin to getAdmin | Minor | . |
| [HBASE-17563](https://issues.apache.org/jira/browse/HBASE-17563) | Foreach and switch in RootDocProcessor and StabilityOptions | Trivial | . |
| [HBASE-17515](https://issues.apache.org/jira/browse/HBASE-17515) | Reduce memory footprint of RegionLoads kept by StochasticLoadBalancer | Major | . |
| [HBASE-17462](https://issues.apache.org/jira/browse/HBASE-17462) | Use sliding window for read/write request costs in StochasticLoadBalancer | Major | . |
| [HBASE-16698](https://issues.apache.org/jira/browse/HBASE-16698) | Performance issue: handlers stuck waiting for CountDownLatch inside WALKey#getWriteEntry under high writing workload | Major | Performance |
| [HBASE-17404](https://issues.apache.org/jira/browse/HBASE-17404) | Replace explicit type with diamond operator in hbase-annotations | Trivial | . |
| [HBASE-10699](https://issues.apache.org/jira/browse/HBASE-10699) | Optimize some code; set capacity on arraylist when possible; use isEmpty; reduce allocations | Major | . |
| [HBASE-17488](https://issues.apache.org/jira/browse/HBASE-17488) | WALEdit should be lazily instantiated | Trivial | . |
| [HBASE-17408](https://issues.apache.org/jira/browse/HBASE-17408) | Introduce per request limit by number of mutations | Major | . |
| [HBASE-17291](https://issues.apache.org/jira/browse/HBASE-17291) | Remove ImmutableSegment#getKeyValueScanner | Major | Scanners |
| [HBASE-17314](https://issues.apache.org/jira/browse/HBASE-17314) | Limit total buffered size for all replication sources | Major | Replication |
| [HBASE-17348](https://issues.apache.org/jira/browse/HBASE-17348) | Remove the unused hbase.replication from javadoc/comment/book completely | Trivial | . |
| [HBASE-15924](https://issues.apache.org/jira/browse/HBASE-15924) | Enhance hbase services autorestart capability to hbase-daemon.sh | Major | . |
| [HBASE-17292](https://issues.apache.org/jira/browse/HBASE-17292) | Add observer notification before bulk loaded hfile is moved to region directory | Major | . |
| [HBASE-17332](https://issues.apache.org/jira/browse/HBASE-17332) | Replace HashMap to Array for DataBlockEncoding.idToEncoding | Major | . |
| [HBASE-17331](https://issues.apache.org/jira/browse/HBASE-17331) | Avoid busy waiting in ThrottledInputStream | Minor | . |
| [HBASE-17318](https://issues.apache.org/jira/browse/HBASE-17318) | Increment does not add new column if the increment amount is zero at first time writing | Major | . |
| [HBASE-17298](https://issues.apache.org/jira/browse/HBASE-17298) | remove unused code in HRegion#doMiniBatchMutation | Minor | regionserver |
| [HBASE-17296](https://issues.apache.org/jira/browse/HBASE-17296) | Provide per peer throttling for replication | Major | Replication |
| [HBASE-17276](https://issues.apache.org/jira/browse/HBASE-17276) | Reduce log spam from WrongRegionException in large multi()'s | Minor | regionserver |
| [HBASE-17241](https://issues.apache.org/jira/browse/HBASE-17241) | Avoid compacting already compacted mob files with \_del files | Major | mob |
| [HBASE-17207](https://issues.apache.org/jira/browse/HBASE-17207) | Arrays.asList() with too few arguments | Trivial | . |
| [HBASE-16700](https://issues.apache.org/jira/browse/HBASE-16700) | Allow for coprocessor whitelisting | Minor | Coprocessors |
| [HBASE-17239](https://issues.apache.org/jira/browse/HBASE-17239) | Add UnsafeByteOperations#wrap(ByteInput, int offset, int len) API | Major | Protobufs |
| [HBASE-17245](https://issues.apache.org/jira/browse/HBASE-17245) | Replace HTableDescriptor#htd.getColumnFamilies().length with a low-cost implementation | Minor | . |
| [HBASE-14882](https://issues.apache.org/jira/browse/HBASE-14882) | Provide a Put API that adds the provided family, qualifier, value without copying | Major | . |
| [HBASE-17243](https://issues.apache.org/jira/browse/HBASE-17243) | Reuse CompactionPartitionId and avoid creating MobFileName in PartitionedMobCompactor to avoid unnecessary new objects | Minor | mob |
| [HBASE-17194](https://issues.apache.org/jira/browse/HBASE-17194) | Assign the new region to the idle server after splitting | Minor | . |
| [HBASE-17232](https://issues.apache.org/jira/browse/HBASE-17232) | Replace HashSet with ArrayList to accumulate delayed scanners in KVHeap and StoreScanner. | Major | . |
| [HBASE-17161](https://issues.apache.org/jira/browse/HBASE-17161) | MOB : Make ref cell creation more efficient | Major | . |
| [HBASE-17235](https://issues.apache.org/jira/browse/HBASE-17235) | Improvement in creation of CIS for onheap buffer cases | Major | rpc |
| [HBASE-17191](https://issues.apache.org/jira/browse/HBASE-17191) | Make use of UnsafeByteOperations#unsafeWrap(ByteBuffer buffer) in PBUtil#toCell(Cell cell) | Major | . |
| [HBASE-17205](https://issues.apache.org/jira/browse/HBASE-17205) | Add a metric for the duration of region in transition | Minor | Region Assignment |
| [HBASE-17216](https://issues.apache.org/jira/browse/HBASE-17216) | A Few Fields Can Be Safely Made Static | Major | . |
| [HBASE-17212](https://issues.apache.org/jira/browse/HBASE-17212) | Should add null checker on table name in HTable constructor and RegionServerCallable | Major | . |
| [HBASE-17184](https://issues.apache.org/jira/browse/HBASE-17184) | Code cleanup of LruBlockCache | Trivial | . |
| [HBASE-17211](https://issues.apache.org/jira/browse/HBASE-17211) | Add more details in log when UnknownScannerException thrown in ScannerCallable | Minor | Operability |
| [HBASE-17178](https://issues.apache.org/jira/browse/HBASE-17178) | Add region balance throttling | Major | Balancer |
| [HBASE-16302](https://issues.apache.org/jira/browse/HBASE-16302) | age of last shipped op and age of last applied op should be histograms | Major | Replication |
| [HBASE-16561](https://issues.apache.org/jira/browse/HBASE-16561) | Add metrics about read/write/scan queue length and active read/write/scan handler count | Minor | IPC/RPC, metrics |
| [HBASE-17086](https://issues.apache.org/jira/browse/HBASE-17086) | Add comments to explain why Cell#getTagsLength() returns an int, rather than a short | Minor | Interface |
| [HBASE-17176](https://issues.apache.org/jira/browse/HBASE-17176) | Reuse the builder in RequestConverter | Minor | . |
| [HBASE-17157](https://issues.apache.org/jira/browse/HBASE-17157) | Increase the default mergeable threshold for mob compaction | Major | mob |
| [HBASE-17129](https://issues.apache.org/jira/browse/HBASE-17129) | Remove public from methods in DataType interface | Minor | . |
| [HBASE-17123](https://issues.apache.org/jira/browse/HBASE-17123) | Add postBulkLoadHFile variant that notifies the final paths for the hfiles | Major | . |
| [HBASE-17126](https://issues.apache.org/jira/browse/HBASE-17126) | Expose KeyValue#checkParameters() and checkForTagsLength() to be used by other Cell implementations | Minor | Client, regionserver |
| [HBASE-17088](https://issues.apache.org/jira/browse/HBASE-17088) | Refactor RWQueueRpcExecutor/BalancedQueueRpcExecutor/RpcExecutor | Major | rpc |
| [HBASE-16708](https://issues.apache.org/jira/browse/HBASE-16708) | Expose endpoint Coprocessor name in "responseTooSlow" log messages | Major | . |
| [HBASE-17037](https://issues.apache.org/jira/browse/HBASE-17037) | Enhance LoadIncrementalHFiles API to convey loaded files | Major | . |
| [HBASE-17077](https://issues.apache.org/jira/browse/HBASE-17077) | Don't copy the replication queue belonging to the peer which has been deleted | Minor | . |
| [HBASE-17047](https://issues.apache.org/jira/browse/HBASE-17047) | Add an API to get HBase connection cache statistics | Minor | spark |
| [HBASE-17063](https://issues.apache.org/jira/browse/HBASE-17063) | Cleanup TestHRegion : remove duplicate variables for method name and two unused params in initRegion | Minor | . |
| [HBASE-17026](https://issues.apache.org/jira/browse/HBASE-17026) | VerifyReplication log should distinguish whether good row key is result of revalidation | Minor | . |
| [HBASE-16840](https://issues.apache.org/jira/browse/HBASE-16840) | Reuse cell's timestamp and type in ScanQueryMatcher | Minor | . |
| [HBASE-17005](https://issues.apache.org/jira/browse/HBASE-17005) | Improve log message in MobFileCache | Trivial | mob |
| [HBASE-17004](https://issues.apache.org/jira/browse/HBASE-17004) | Refactor IntegrationTestManyRegions to use @ClassRule for timing out | Minor | integration tests |
| [HBASE-16946](https://issues.apache.org/jira/browse/HBASE-16946) | Provide Raw scan as an option in VerifyReplication | Minor | hbase |
| [HBASE-17013](https://issues.apache.org/jira/browse/HBASE-17013) | Add constructor to RowMutations for initializing the capacity of internal list | Minor | . |
| [HBASE-17006](https://issues.apache.org/jira/browse/HBASE-17006) | Add names to threads for better debugability of thread dumps | Minor | Operability |
| [HBASE-17014](https://issues.apache.org/jira/browse/HBASE-17014) | Add clearly marked starting and shutdown log messages for all services. | Minor | Operability |
| [HBASE-16950](https://issues.apache.org/jira/browse/HBASE-16950) | Print raw stats in the end of procedure performance tools for parsing results from scripts | Trivial | . |
| [HBASE-16783](https://issues.apache.org/jira/browse/HBASE-16783) | Use ByteBufferPool for the header and message during Rpc response | Minor | . |
| [HBASE-16562](https://issues.apache.org/jira/browse/HBASE-16562) | ITBLL should fail to start if misconfigured | Major | integration tests |
| [HBASE-16414](https://issues.apache.org/jira/browse/HBASE-16414) | Improve performance for RPC encryption with Apache Common Crypto | Major | IPC/RPC |
| [HBASE-16854](https://issues.apache.org/jira/browse/HBASE-16854) | Refactor the org.apache.hadoop.hbase.client.Action | Minor | . |
| [HBASE-16774](https://issues.apache.org/jira/browse/HBASE-16774) | [shell] Add coverage to TestShell when ZooKeeper is not reachable | Major | shell, test |
| [HBASE-16844](https://issues.apache.org/jira/browse/HBASE-16844) | Procedure V2: DispatchMergingRegionsProcedure to use base class StateMachineProcedure for abort and rollback | Trivial | master, proc-v2 |
| [HBASE-16818](https://issues.apache.org/jira/browse/HBASE-16818) | Avoid multiple copies of binary data during the conversion from Result to Row | Major | spark |
| [HBASE-16821](https://issues.apache.org/jira/browse/HBASE-16821) | Enhance LoadIncrementalHFiles API to convey missing hfiles if any | Major | . |
| [HBASE-15921](https://issues.apache.org/jira/browse/HBASE-15921) | Add first AsyncTable impl and create TableImpl based on it | Major | Client |
| [HBASE-16792](https://issues.apache.org/jira/browse/HBASE-16792) | Reuse KeyValue.KeyOnlyKeyValue in BufferedDataBlockEncoder.SeekerState | Minor | . |
| [HBASE-16784](https://issues.apache.org/jira/browse/HBASE-16784) | Make use of ExtendedCell#write(OutputStream os) for the default HFileWriter#append() | Major | . |
| [HBASE-16809](https://issues.apache.org/jira/browse/HBASE-16809) | Save one cell length calculation in HeapMemStoreLAB#copyCellInto | Minor | . |
| [HBASE-16661](https://issues.apache.org/jira/browse/HBASE-16661) | Add last major compaction age to per-region metrics | Minor | . |
| [HBASE-16773](https://issues.apache.org/jira/browse/HBASE-16773) | AccessController should access local region if possible | Major | . |
| [HBASE-16657](https://issues.apache.org/jira/browse/HBASE-16657) | Expose per-region last major compaction timestamp in RegionServer UI | Minor | regionserver, UI |
| [HBASE-16772](https://issues.apache.org/jira/browse/HBASE-16772) | Add verbose option to VerifyReplication for logging good rows | Minor | Replication, Usability |
| [HBASE-16690](https://issues.apache.org/jira/browse/HBASE-16690) | Move znode path configs to a separated class | Major | Zookeeper |
| [HBASE-16672](https://issues.apache.org/jira/browse/HBASE-16672) | Add option for bulk load to always copy hfile(s) instead of renaming | Major | . |
| [HBASE-16720](https://issues.apache.org/jira/browse/HBASE-16720) | Sort build ids in flaky dashboard | Minor | . |
| [HBASE-16691](https://issues.apache.org/jira/browse/HBASE-16691) | Optimize KeyOnlyFilter by utilizing KeyOnlyCell | Major | . |
| [HBASE-16714](https://issues.apache.org/jira/browse/HBASE-16714) | Procedure V2 - use base class to remove duplicate set up test code in table DDL procedures | Major | proc-v2, test |
| [HBASE-16694](https://issues.apache.org/jira/browse/HBASE-16694) | Reduce garbage for onDiskChecksum in HFileBlock | Minor | . |
| [HBASE-16705](https://issues.apache.org/jira/browse/HBASE-16705) | Eliminate long to Long auto boxing in LongComparator | Minor | Filters |
| [HBASE-16692](https://issues.apache.org/jira/browse/HBASE-16692) | Make ByteBufferUtils#equals safer and correct | Major | . |
| [HBASE-16667](https://issues.apache.org/jira/browse/HBASE-16667) | Building with JDK 8: ignoring option MaxPermSize=256m | Minor | build |
| [HBASE-16423](https://issues.apache.org/jira/browse/HBASE-16423) | Add re-compare option to VerifyReplication to avoid occasional inconsistent rows | Minor | Replication |
| [HBASE-16680](https://issues.apache.org/jira/browse/HBASE-16680) | Reduce garbage in BufferChain | Minor | . |
| [HBASE-16659](https://issues.apache.org/jira/browse/HBASE-16659) | Use CellUtil.createFirstOnRow instead of KeyValueUtil.createFirstOnRow in some places. | Minor | . |
| [HBASE-16646](https://issues.apache.org/jira/browse/HBASE-16646) | Enhance LoadIncrementalHFiles API to accept store file paths as input | Major | . |
| [HBASE-16658](https://issues.apache.org/jira/browse/HBASE-16658) | Optimize UTF8 string/byte conversions | Minor | . |
| [HBASE-16640](https://issues.apache.org/jira/browse/HBASE-16640) | TimeoutBlockingQueue#remove() should return whether the entry is removed | Minor | . |
| [HBASE-15949](https://issues.apache.org/jira/browse/HBASE-15949) | Cleanup TestRegionServerMetrics | Minor | . |
| [HBASE-16381](https://issues.apache.org/jira/browse/HBASE-16381) | Shell deleteall command should support row key prefixes | Minor | shell |
| [HBASE-16616](https://issues.apache.org/jira/browse/HBASE-16616) | Rpc handlers stuck on ThreadLocalMap.expungeStaleEntry | Major | Performance |
| [HBASE-16086](https://issues.apache.org/jira/browse/HBASE-16086) | TableCfWALEntryFilter and ScopeWALEntryFilter should not redundantly iterate over cells. | Major | . |
| [HBASE-16541](https://issues.apache.org/jira/browse/HBASE-16541) | Avoid unnecessary cell copy in Result#compareResults | Major | . |
| [HBASE-16399](https://issues.apache.org/jira/browse/HBASE-16399) | Provide an API to get list of failed regions and servername in Canary | Major | canary |
| [HBASE-16502](https://issues.apache.org/jira/browse/HBASE-16502) | Reduce garbage in BufferedDataBlockEncoder | Major | . |
| [HBASE-16509](https://issues.apache.org/jira/browse/HBASE-16509) | Add option to LoadIncrementalHFiles which allows skipping unmatched column families | Major | . |
| [HBASE-16224](https://issues.apache.org/jira/browse/HBASE-16224) | Reduce the number of RPCs for the large PUTs | Minor | Client |
| [HBASE-16508](https://issues.apache.org/jira/browse/HBASE-16508) | Move UnexpectedStateException to common | Trivial | . |
| [HBASE-16486](https://issues.apache.org/jira/browse/HBASE-16486) | Unify system table creation using the same createSystemTable API. | Minor | proc-v2 |
| [HBASE-16448](https://issues.apache.org/jira/browse/HBASE-16448) | Custom metrics for custom replication endpoints | Major | Replication |
| [HBASE-16450](https://issues.apache.org/jira/browse/HBASE-16450) | Shell tool to dump replication queues | Major | Operability, Replication |
| [HBASE-16455](https://issues.apache.org/jira/browse/HBASE-16455) | Provide API for obtaining all the WAL files | Major | . |
| [HBASE-16422](https://issues.apache.org/jira/browse/HBASE-16422) | Tighten our guarantees on compatibility across patch versions | Major | documentation |
| [HBASE-16434](https://issues.apache.org/jira/browse/HBASE-16434) | Improve flaky dashboard | Minor | . |
| [HBASE-16419](https://issues.apache.org/jira/browse/HBASE-16419) | check REPLICATION\_SCOPE's value more stringently | Major | . |
| [HBASE-16385](https://issues.apache.org/jira/browse/HBASE-16385) | Have hbase-rest pull hbase.rest.port from Constants.java | Minor | REST |
| [HBASE-16379](https://issues.apache.org/jira/browse/HBASE-16379) | [replication] Minor improvement to replication/copy\_tables\_desc.rb | Trivial | Replication, shell |
| [HBASE-14345](https://issues.apache.org/jira/browse/HBASE-14345) | Consolidate printUsage in IntegrationTestLoadAndVerify | Trivial | integration tests |
| [HBASE-16299](https://issues.apache.org/jira/browse/HBASE-16299) | Update REST API scanner with ability to do reverse scan | Minor | REST |
| [HBASE-12770](https://issues.apache.org/jira/browse/HBASE-12770) | Don't transfer all the queued hlogs of a dead server to the same alive server | Minor | Replication |
| [HBASE-15882](https://issues.apache.org/jira/browse/HBASE-15882) | Upgrade to yetus precommit 0.3.0 | Critical | build |
| [HBASE-8386](https://issues.apache.org/jira/browse/HBASE-8386) | deprecate TableMapReduce.addDependencyJars(Configuration, class\<?\> ...) | Major | mapreduce |
| [HBASE-16287](https://issues.apache.org/jira/browse/HBASE-16287) | LruBlockCache size should not exceed acceptableSize too many | Major | BlockCache |
| [HBASE-16225](https://issues.apache.org/jira/browse/HBASE-16225) | Refactor ScanQueryMatcher | Major | regionserver, Scanners |
| [HBASE-14881](https://issues.apache.org/jira/browse/HBASE-14881) | Provide a Put API that uses the provided row without coping | Major | . |
| [HBASE-16256](https://issues.apache.org/jira/browse/HBASE-16256) | Purpose of EnvironmentEdge, EnvironmentEdgeManager | Trivial | documentation, regionserver |
| [HBASE-16275](https://issues.apache.org/jira/browse/HBASE-16275) | Change ServerManager#onlineServers from ConcurrentHashMap to ConcurrentSkipListMap | Minor | . |
| [HBASE-14743](https://issues.apache.org/jira/browse/HBASE-14743) | Add metrics around HeapMemoryManager | Minor | . |
| [HBASE-16266](https://issues.apache.org/jira/browse/HBASE-16266) | Do not throw ScannerTimeoutException when catch UnknownScannerException | Major | Client, Scanners |
| [HBASE-16008](https://issues.apache.org/jira/browse/HBASE-16008) | A robust way deal with early termination of HBCK | Major | hbck |
| [HBASE-13701](https://issues.apache.org/jira/browse/HBASE-13701) | Consolidate SecureBulkLoadEndpoint into HBase core as default for bulk load | Major | . |
| [HBASE-16052](https://issues.apache.org/jira/browse/HBASE-16052) | Improve HBaseFsck Scalability | Major | hbck |
| [HBASE-16241](https://issues.apache.org/jira/browse/HBASE-16241) | Allow specification of annotations to use when running check\_compatibility.sh | Major | scripts |
| [HBASE-16231](https://issues.apache.org/jira/browse/HBASE-16231) | Integration tests should support client keytab login for secure clusters | Major | integration tests |
| [HBASE-16220](https://issues.apache.org/jira/browse/HBASE-16220) | Demote log level for "HRegionFileSystem - No StoreFiles for" messages to TRACE | Minor | . |
| [HBASE-16087](https://issues.apache.org/jira/browse/HBASE-16087) | Replication shouldn't start on a master if if only hosts system tables | Major | . |
| [HBASE-14548](https://issues.apache.org/jira/browse/HBASE-14548) | Expand how table coprocessor jar and dependency path can be specified | Major | Coprocessors |
| [HBASE-16108](https://issues.apache.org/jira/browse/HBASE-16108) | RowCounter should support multiple key ranges | Major | . |
| [HBASE-16140](https://issues.apache.org/jira/browse/HBASE-16140) | bump owasp.esapi from 2.1.0 to 2.1.0.1 | Major | dependencies |
| [HBASE-16114](https://issues.apache.org/jira/browse/HBASE-16114) | Get regionLocation of required regions only for MR jobs | Minor | mapreduce |
| [HBASE-16147](https://issues.apache.org/jira/browse/HBASE-16147) | Shell command for getting compaction state | Major | shell |
| [HBASE-16124](https://issues.apache.org/jira/browse/HBASE-16124) | Make check\_compatibility.sh less verbose when building HBase | Minor | build, test |
| [HBASE-16149](https://issues.apache.org/jira/browse/HBASE-16149) | Log the underlying RPC exception in RpcRetryingCallerImpl | Minor | . |
| [HBASE-16130](https://issues.apache.org/jira/browse/HBASE-16130) | Add comments to ProcedureStoreTracker | Minor | . |
| [HBASE-16139](https://issues.apache.org/jira/browse/HBASE-16139) | Use CellUtil instead of KeyValueUtil in Import | Minor | . |
| [HBASE-14007](https://issues.apache.org/jira/browse/HBASE-14007) | Writing to table through MR should fail upfront if table does not exist/is disabled | Minor | mapreduce |
| [HBASE-16089](https://issues.apache.org/jira/browse/HBASE-16089) | Add on FastPath for CoDel | Major | . |
| [HBASE-15353](https://issues.apache.org/jira/browse/HBASE-15353) | Add metric for number of CallQueueTooBigExceptions | Minor | IPC/RPC, metrics |
| [HBASE-16085](https://issues.apache.org/jira/browse/HBASE-16085) | Add on metric for failed compactions | Major | . |
| [HBASE-15870](https://issues.apache.org/jira/browse/HBASE-15870) | Specify columns in REST multi gets | Minor | REST |
| [HBASE-14397](https://issues.apache.org/jira/browse/HBASE-14397) | PrefixFilter doesn't filter all remaining rows if the prefix is longer than rowkey being compared | Minor | Filters |
| [HBASE-16042](https://issues.apache.org/jira/browse/HBASE-16042) | Add support in PE tool for InMemory Compaction | Major | . |
| [HBASE-15600](https://issues.apache.org/jira/browse/HBASE-15600) | Add provision for adding mutations to memstore or able to write to same region in batchMutate coprocessor hooks | Major | . |
| [HBASE-16018](https://issues.apache.org/jira/browse/HBASE-16018) | Better documentation of ReplicationPeers | Minor | . |
| [HBASE-16048](https://issues.apache.org/jira/browse/HBASE-16048) | Tag InternalScanner with LimitedPrivate(HBaseInterfaceAudience.COPROC) | Major | . |
| [HBASE-5291](https://issues.apache.org/jira/browse/HBASE-5291) | Add Kerberos HTTP SPNEGO authentication support to HBase web consoles | Major | master, regionserver, security |
| [HBASE-16033](https://issues.apache.org/jira/browse/HBASE-16033) | Add more details in logging of responseTooSlow/TooLarge | Major | Operability |
| [HBASE-16026](https://issues.apache.org/jira/browse/HBASE-16026) | Master UI should display status of additional ZK switches | Major | . |
| [HBASE-16004](https://issues.apache.org/jira/browse/HBASE-16004) | Update to Netty 4.1.1 | Major | . |
| [HBASE-15981](https://issues.apache.org/jira/browse/HBASE-15981) | Stripe and Date-tiered compactions inaccurately suggest disabling table in docs | Minor | documentation |
| [HBASE-15849](https://issues.apache.org/jira/browse/HBASE-15849) | Shell Cleanup: Simplify handling of commands' runtime | Minor | . |
| [HBASE-15931](https://issues.apache.org/jira/browse/HBASE-15931) | Add log for long-running tasks in AsyncProcess | Critical | Operability |
| [HBASE-15727](https://issues.apache.org/jira/browse/HBASE-15727) | Canary Tool for Zookeeper | Major | . |
| [HBASE-15910](https://issues.apache.org/jira/browse/HBASE-15910) | Update hbase ref guide to explain submit-patch.py | Major | documentation |
| [HBASE-15890](https://issues.apache.org/jira/browse/HBASE-15890) | Allow thrift to set/unset "cacheBlocks" for Scans | Major | Thrift |
| [HBASE-15854](https://issues.apache.org/jira/browse/HBASE-15854) | Log the cause of SASL connection failures | Minor | security |
| [HBASE-15837](https://issues.apache.org/jira/browse/HBASE-15837) | Memstore size accounting is wrong if postBatchMutate() throws exception | Major | regionserver |
| [HBASE-15471](https://issues.apache.org/jira/browse/HBASE-15471) | Add num calls in priority and general queue to RS UI | Major | UI |
| [HBASE-15802](https://issues.apache.org/jira/browse/HBASE-15802) | ConnectionUtils should use ThreadLocalRandom instead of Random | Minor | . |
| [HBASE-15529](https://issues.apache.org/jira/browse/HBASE-15529) | Override needBalance in StochasticLoadBalancer | Minor | . |
| [HBASE-15864](https://issues.apache.org/jira/browse/HBASE-15864) | Reuse the testing helper to wait regions in transition | Trivial | test |
| [HBASE-15843](https://issues.apache.org/jira/browse/HBASE-15843) | Replace RegionState.getRegionInTransition() Map with a Set | Trivial | master, Region Assignment |
| [HBASE-15593](https://issues.apache.org/jira/browse/HBASE-15593) | Time limit of scanning should be offered by client | Major | . |
| [HBASE-15667](https://issues.apache.org/jira/browse/HBASE-15667) | Add more clarity to Reference Guide related to importing Eclipse Formatter | Trivial | documentation |
| [HBASE-15842](https://issues.apache.org/jira/browse/HBASE-15842) | SnapshotInfo should display ownership information | Major | . |
| [HBASE-13532](https://issues.apache.org/jira/browse/HBASE-13532) | Make UnknownScannerException logging less scary | Trivial | . |
| [HBASE-15808](https://issues.apache.org/jira/browse/HBASE-15808) | Reduce potential bulk load intermediate space usage and waste | Minor | . |
| [HBASE-15415](https://issues.apache.org/jira/browse/HBASE-15415) | Improve Master WebUI snapshot information | Minor | master, snapshots |
| [HBASE-15609](https://issues.apache.org/jira/browse/HBASE-15609) | Remove PB references from Result, DoubleColumnInterpreter and any such public facing class for 2.0 | Blocker | . |
| [HBASE-15791](https://issues.apache.org/jira/browse/HBASE-15791) | Improve javadoc in ScheduledChore | Minor | master |
| [HBASE-15793](https://issues.apache.org/jira/browse/HBASE-15793) | Port over AsyncCall improvements | Major | rpc |
| [HBASE-15794](https://issues.apache.org/jira/browse/HBASE-15794) | Fix Findbugs instanceof always true issue in MultiServerCallable | Minor | . |
| [HBASE-15795](https://issues.apache.org/jira/browse/HBASE-15795) | Cleanup all classes in package org.apache.hadoop.hbase.ipc for code style | Minor | . |
| [HBASE-15745](https://issues.apache.org/jira/browse/HBASE-15745) | Refactor RPC classes to better accept async changes. | Major | . |
| [HBASE-15773](https://issues.apache.org/jira/browse/HBASE-15773) | CellCounter improvements | Major | mapreduce |
| [HBASE-15759](https://issues.apache.org/jira/browse/HBASE-15759) | RegionObserver.preStoreScannerOpen() doesn't have acces to current readpoint | Minor | Coprocessors |
| [HBASE-15608](https://issues.apache.org/jira/browse/HBASE-15608) | Remove PB references from SnapShot related Exceptions | Blocker | . |
| [HBASE-15767](https://issues.apache.org/jira/browse/HBASE-15767) | Upgrade httpclient dependency | Major | build, dependencies |
| [HBASE-15768](https://issues.apache.org/jira/browse/HBASE-15768) | fix capitalization of ZooKeeper usage | Trivial | documentation |
| [HBASE-15720](https://issues.apache.org/jira/browse/HBASE-15720) | Print row locks at the debug dump page | Major | . |
| [HBASE-15744](https://issues.apache.org/jira/browse/HBASE-15744) | Port over small format/text improvements from HBASE-13784 | Trivial | . |
| [HBASE-15551](https://issues.apache.org/jira/browse/HBASE-15551) | Make call queue too big exception use servername | Minor | . |
| [HBASE-15706](https://issues.apache.org/jira/browse/HBASE-15706) | HFilePrettyPrinter should print out nicely formatted tags | Minor | HFile |
| [HBASE-15686](https://issues.apache.org/jira/browse/HBASE-15686) | Add override mechanism for the exempt classes when dynamically loading table coprocessor | Major | Coprocessors |
| [HBASE-15680](https://issues.apache.org/jira/browse/HBASE-15680) | Examples in shell help message for TIMERANGE scanner specifications should use milliseconds instead of seconds | Trivial | shell |
| [HBASE-15688](https://issues.apache.org/jira/browse/HBASE-15688) | Use MasterServices directly instead of casting to HMaster when possible | Trivial | master |
| [HBASE-15641](https://issues.apache.org/jira/browse/HBASE-15641) | Shell "alter" should do a single modifyTable operation | Major | shell |
| [HBASE-15614](https://issues.apache.org/jira/browse/HBASE-15614) | Report metrics from JvmPauseMonitor | Major | metrics, regionserver |
| [HBASE-13129](https://issues.apache.org/jira/browse/HBASE-13129) | Add troubleshooting hints around WAL retention from replication | Major | documentation, Replication |
| [HBASE-15632](https://issues.apache.org/jira/browse/HBASE-15632) | Undo the checking of lastStoreFlushTimeMap.isEmpty() introduced in HBASE-13145 | Minor | regionserver |
| [HBASE-14985](https://issues.apache.org/jira/browse/HBASE-14985) | TimeRange constructors should set allTime when appropriate | Minor | . |
| [HBASE-15605](https://issues.apache.org/jira/browse/HBASE-15605) | Remove PB references from HCD and HTD for 2.0 | Blocker | . |
| [HBASE-15507](https://issues.apache.org/jira/browse/HBASE-15507) | Online modification of enabled ReplicationPeerConfig | Major | Replication |
| [HBASE-15612](https://issues.apache.org/jira/browse/HBASE-15612) | Minor improvements to CellCounter and RowCounter documentation | Trivial | documentation, mapreduce |
| [HBASE-15586](https://issues.apache.org/jira/browse/HBASE-15586) | Unify human readable numbers in the web UI | Major | . |
| [HBASE-15606](https://issues.apache.org/jira/browse/HBASE-15606) | Limit creating zk connection in HBaseAdmin#getCompactionState() only to case when 'hbase:meta' is checked. | Minor | Admin |
| [HBASE-15396](https://issues.apache.org/jira/browse/HBASE-15396) | Enhance mapreduce.TableSplit to add encoded region name | Minor | mapreduce |
| [HBASE-15571](https://issues.apache.org/jira/browse/HBASE-15571) | Make MasterProcedureManagerHost accessible through MasterServices | Major | . |
| [HBASE-15569](https://issues.apache.org/jira/browse/HBASE-15569) | Make Bytes.toStringBinary faster | Minor | Performance |
| [HBASE-14983](https://issues.apache.org/jira/browse/HBASE-14983) | Create metrics for per block type hit/miss ratios | Major | metrics |
| [HBASE-15191](https://issues.apache.org/jira/browse/HBASE-15191) | CopyTable and VerifyReplication - Option to specify batch size, versions | Minor | Replication |
| [HBASE-15508](https://issues.apache.org/jira/browse/HBASE-15508) | Add command for exporting snapshot in hbase command script | Minor | hbase, scripts, snapshots |
| [HBASE-15496](https://issues.apache.org/jira/browse/HBASE-15496) | Throw RowTooBigException only for user scan/get | Minor | Scanners |
| [HBASE-15526](https://issues.apache.org/jira/browse/HBASE-15526) | Make SnapshotManager accessible through MasterServices | Major | . |
| [HBASE-15486](https://issues.apache.org/jira/browse/HBASE-15486) | Avoid multiple disable/enable balancer calls while running rolling-restart.sh --graceful | Minor | scripts |
| [HBASE-15300](https://issues.apache.org/jira/browse/HBASE-15300) | Upgrade to zookeeper 3.4.8 | Minor | . |
| [HBASE-14703](https://issues.apache.org/jira/browse/HBASE-14703) | HTable.mutateRow does not collect stats | Major | Client |
| [HBASE-15475](https://issues.apache.org/jira/browse/HBASE-15475) | Allow TimestampsFilter to provide a seek hint | Major | Client, Filters, regionserver |
| [HBASE-15212](https://issues.apache.org/jira/browse/HBASE-15212) | RPCServer should enforce max request size | Major | . |
| [HBASE-15447](https://issues.apache.org/jira/browse/HBASE-15447) | Improve javadocs description for Delete methods | Minor | API, documentation |
| [HBASE-15478](https://issues.apache.org/jira/browse/HBASE-15478) | add comments to FSHLog explaining why syncRunnerIndex won't overflow | Minor | wal |
| [HBASE-14963](https://issues.apache.org/jira/browse/HBASE-14963) | Remove use of Guava Stopwatch from HBase client code | Major | Client |
| [HBASE-15451](https://issues.apache.org/jira/browse/HBASE-15451) | Remove unnecessary wait in MVCC | Major | . |
| [HBASE-15456](https://issues.apache.org/jira/browse/HBASE-15456) | CreateTableProcedure/ModifyTableProcedure needs to fail when there is no family in table descriptor | Minor | master |
| [HBASE-12940](https://issues.apache.org/jira/browse/HBASE-12940) | Expose listPeerConfigs and getPeerConfig to the HBase shell | Major | shell |
| [HBASE-15470](https://issues.apache.org/jira/browse/HBASE-15470) | Add a setting for Priority queue length | Major | IPC/RPC, Region Assignment |
| [HBASE-15413](https://issues.apache.org/jira/browse/HBASE-15413) | Procedure-V2: print out ProcedureInfo during trace | Trivial | proc-v2 |
| [HBASE-15243](https://issues.apache.org/jira/browse/HBASE-15243) | Utilize the lowest seek value when all Filters in MUST\_PASS\_ONE FilterList return SEEK\_NEXT\_USING\_HINT | Major | . |
| [HBASE-15338](https://issues.apache.org/jira/browse/HBASE-15338) | Add a option to disable the data block cache for testing the performance of underlying file system | Minor | integration tests |
| [HBASE-15356](https://issues.apache.org/jira/browse/HBASE-15356) | Remove unused Imports | Trivial | . |
| [HBASE-14099](https://issues.apache.org/jira/browse/HBASE-14099) | StoreFile.passesKeyRangeFilter need not create Cells from the Scan's start and stop Row | Major | Performance, Scanners |
| [HBASE-15315](https://issues.apache.org/jira/browse/HBASE-15315) | Remove always set super user call as high priority | Major | . |
| [HBASE-15222](https://issues.apache.org/jira/browse/HBASE-15222) | Use less contended classes for metrics | Critical | metrics |
| [HBASE-15312](https://issues.apache.org/jira/browse/HBASE-15312) | Update the dependences of pom for mini cluster in HBase Book | Minor | documentation |
| [HBASE-15306](https://issues.apache.org/jira/browse/HBASE-15306) | Make RPC call queue length dynamically configurable | Major | IPC/RPC |
| [HBASE-11927](https://issues.apache.org/jira/browse/HBASE-11927) | Use Native Hadoop Library for HFile checksum (And flip default from CRC32 to CRC32C) | Major | Performance |
| [HBASE-15301](https://issues.apache.org/jira/browse/HBASE-15301) | Remove the never-thrown NamingException from TableInputFormatBase#reverseDNS method signature | Minor | . |
| [HBASE-15219](https://issues.apache.org/jira/browse/HBASE-15219) | Canary tool does not return non-zero exit code when one of regions is in stuck state | Critical | canary |
| [HBASE-15223](https://issues.apache.org/jira/browse/HBASE-15223) | Make convertScanToString public for Spark | Major | . |
| [HBASE-15229](https://issues.apache.org/jira/browse/HBASE-15229) | Canary Tools should not call System.Exit on error | Critical | canary |
| [HBASE-11792](https://issues.apache.org/jira/browse/HBASE-11792) | Organize PerformanceEvaluation usage output | Minor | Performance, test |
| [HBASE-15201](https://issues.apache.org/jira/browse/HBASE-15201) | Add hbase-spark to hbase assembly | Minor | . |
| [HBASE-15211](https://issues.apache.org/jira/browse/HBASE-15211) | Don't run the CatalogJanitor if there are regions in transition | Major | master |
| [HBASE-15197](https://issues.apache.org/jira/browse/HBASE-15197) | Expose filtered read requests metric to metrics framework and Web UI | Minor | . |
| [HBASE-15177](https://issues.apache.org/jira/browse/HBASE-15177) | Reduce garbage created under high load | Major | . |
| [HBASE-13376](https://issues.apache.org/jira/browse/HBASE-13376) | Improvements to Stochastic load balancer | Minor | Balancer |
| [HBASE-15129](https://issues.apache.org/jira/browse/HBASE-15129) | Set default value for hbase.fs.tmp.dir rather than fully depend on hbase-default.xml | Major | mapreduce |
| [HBASE-14969](https://issues.apache.org/jira/browse/HBASE-14969) | Add throughput controller for flush | Major | regionserver |
| [HBASE-15123](https://issues.apache.org/jira/browse/HBASE-15123) | Remove duplicate code in LocalHBaseCluster and minor formatting | Minor | . |
| [HBASE-14865](https://issues.apache.org/jira/browse/HBASE-14865) | Support passing multiple QOPs to SaslClient/Server via hbase.rpc.protection | Major | security |
| [HBASE-15119](https://issues.apache.org/jira/browse/HBASE-15119) | Include git SHA in check\_compatibility reports | Minor | build |
| [HBASE-13525](https://issues.apache.org/jira/browse/HBASE-13525) | Update test-patch to leverage Apache Yetus | Major | build |
| [HBASE-15076](https://issues.apache.org/jira/browse/HBASE-15076) | Add getScanner(Scan scan, List\<KeyValueScanner\> additionalScanners) API into Region interface | Critical | regionserver |
| [HBASE-15068](https://issues.apache.org/jira/browse/HBASE-15068) | Add metrics for region normalization plans | Major | . |
| [HBASE-14468](https://issues.apache.org/jira/browse/HBASE-14468) | Compaction improvements: FIFO compaction policy | Major | Compaction, Performance |
| [HBASE-15066](https://issues.apache.org/jira/browse/HBASE-15066) | Small improvements to Canary tool | Major | . |
| [HBASE-14524](https://issues.apache.org/jira/browse/HBASE-14524) | Short-circuit comparison of rows in CellComparator | Major | Performance, Scanners |
| [HBASE-15038](https://issues.apache.org/jira/browse/HBASE-15038) | ExportSnapshot should support separate configurations for source and destination clusters | Major | mapreduce, snapshots |
| [HBASE-15060](https://issues.apache.org/jira/browse/HBASE-15060) | Cull TestHFileWriterV2 and HFileWriterFactory | Major | HFile |
| [HBASE-15044](https://issues.apache.org/jira/browse/HBASE-15044) | Region normalization should be allowed when underlying namespace has quota | Major | Balancer |
| [HBASE-14796](https://issues.apache.org/jira/browse/HBASE-14796) | Enhance the Gets in the connector | Minor | . |
| [HBASE-13322](https://issues.apache.org/jira/browse/HBASE-13322) | Replace explicit HBaseAdmin creation with connection#getAdmin() | Minor | . |
| [HBASE-14800](https://issues.apache.org/jira/browse/HBASE-14800) | Expose checkAndMutate via Thrift2 | Major | Thrift |
| [HBASE-14684](https://issues.apache.org/jira/browse/HBASE-14684) | Try to remove all MiniMapReduceCluster in unit tests | Critical | test |
| [HBASE-13158](https://issues.apache.org/jira/browse/HBASE-13158) | When client supports CellBlock, return the result Cells as controller payload for get(Get) API also | Major | . |
| [HBASE-14976](https://issues.apache.org/jira/browse/HBASE-14976) | Add RPC call queues to the web ui | Minor | UI |
| [HBASE-15005](https://issues.apache.org/jira/browse/HBASE-15005) | Use value array in computing block length for 1.2 and 1.3 | Major | regionserver |
| [HBASE-14978](https://issues.apache.org/jira/browse/HBASE-14978) | Don't allow Multi to retain too many blocks | Blocker | io, IPC/RPC, regionserver |
| [HBASE-14780](https://issues.apache.org/jira/browse/HBASE-14780) | Integration Tests that run with ChaosMonkey need to specify CFs | Major | integration tests |
| [HBASE-14951](https://issues.apache.org/jira/browse/HBASE-14951) | Make hbase.regionserver.maxlogs obsolete | Minor | Performance, wal |
| [HBASE-14984](https://issues.apache.org/jira/browse/HBASE-14984) | Allow memcached block cache to set optimze to false | Major | BlockCache |
| [HBASE-13425](https://issues.apache.org/jira/browse/HBASE-13425) | Documentation nit in REST Gateway impersonation section | Minor | documentation |
| [HBASE-14795](https://issues.apache.org/jira/browse/HBASE-14795) | Enhance the spark-hbase scan operations | Minor | . |
| [HBASE-14946](https://issues.apache.org/jira/browse/HBASE-14946) | Don't allow multi's to over run the max result size. | Critical | Client, IPC/RPC |
| [HBASE-14906](https://issues.apache.org/jira/browse/HBASE-14906) | Improvements on FlushLargeStoresPolicy | Major | . |
| [HBASE-14866](https://issues.apache.org/jira/browse/HBASE-14866) | VerifyReplication should use peer configuration in peer connection | Major | Replication |
| [HBASE-7171](https://issues.apache.org/jira/browse/HBASE-7171) | Initial web UI for region/memstore/storefiles details | Major | UI |
| [HBASE-14719](https://issues.apache.org/jira/browse/HBASE-14719) | Add metric for number of MasterProcWALs | Major | . |
| [HBASE-14580](https://issues.apache.org/jira/browse/HBASE-14580) | Make the HBaseMiniCluster compliant with Kerberos | Major | security, test |
| [HBASE-14749](https://issues.apache.org/jira/browse/HBASE-14749) | Make changes to region\_mover.rb to use RegionMover Java tool | Major | . |
| [HBASE-14891](https://issues.apache.org/jira/browse/HBASE-14891) | Add log for uncaught exception in RegionServerMetricsWrapperRunnable | Minor | metrics |
| [HBASE-14859](https://issues.apache.org/jira/browse/HBASE-14859) | Better checkstyle reporting | Minor | . |
| [HBASE-14826](https://issues.apache.org/jira/browse/HBASE-14826) | Small improvement in KVHeap seek() API | Minor | . |
| [HBASE-14860](https://issues.apache.org/jira/browse/HBASE-14860) | Improve BoundedByteBufferPool; make lockless | Minor | . |
| [HBASE-14871](https://issues.apache.org/jira/browse/HBASE-14871) | Allow specifying the base branch for make\_patch | Major | . |
| [HBASE-14821](https://issues.apache.org/jira/browse/HBASE-14821) | CopyTable should allow overriding more config properties for peer cluster | Major | mapreduce |
| [HBASE-13347](https://issues.apache.org/jira/browse/HBASE-13347) | Deprecate FirstKeyValueMatchingQualifiersFilter | Minor | . |
| [HBASE-14862](https://issues.apache.org/jira/browse/HBASE-14862) | Add support for reporting p90 for histogram metrics | Minor | metrics |
| [HBASE-14172](https://issues.apache.org/jira/browse/HBASE-14172) | Upgrade existing thrift binding using thrift 0.9.3 compiler. | Minor | . |
| [HBASE-14829](https://issues.apache.org/jira/browse/HBASE-14829) | Add more checkstyles | Major | . |
| [HBASE-14805](https://issues.apache.org/jira/browse/HBASE-14805) | status should show the master in shell | Major | shell |
| [HBASE-14708](https://issues.apache.org/jira/browse/HBASE-14708) | Use copy on write Map for region location cache | Critical | Client |
| [HBASE-14766](https://issues.apache.org/jira/browse/HBASE-14766) | In WALEntryFilter, cell.getFamily() needs to be replaced with the new low-cost implementation | Major | . |
| [HBASE-14387](https://issues.apache.org/jira/browse/HBASE-14387) | Compaction improvements: Maximum off-peak compaction size | Major | Compaction, Performance |
| [HBASE-14693](https://issues.apache.org/jira/browse/HBASE-14693) | Add client-side metrics for received pushback signals | Major | Client, metrics |
| [HBASE-14765](https://issues.apache.org/jira/browse/HBASE-14765) | Remove snappy profile | Major | build |
| [HBASE-14752](https://issues.apache.org/jira/browse/HBASE-14752) | Add example of using the HBase client in a multi-threaded environment | Minor | Client |
| [HBASE-14666](https://issues.apache.org/jira/browse/HBASE-14666) | Remove deprecated HBaseTestingUtility#deleteTable methods | Major | test |
| [HBASE-12986](https://issues.apache.org/jira/browse/HBASE-12986) | Compaction pressure based client pushback | Major | . |
| [HBASE-12822](https://issues.apache.org/jira/browse/HBASE-12822) | Option for Unloading regions through region\_mover.rb without Acknowledging | Minor | . |
| [HBASE-13742](https://issues.apache.org/jira/browse/HBASE-13742) | buildbot should run link checker over book | Major | documentation |
| [HBASE-14700](https://issues.apache.org/jira/browse/HBASE-14700) | Support a "permissive" mode for secure clusters to allow "simple" auth clients | Major | security |
| [HBASE-14715](https://issues.apache.org/jira/browse/HBASE-14715) | Add javadocs to DelegatingRetryingCallable | Trivial | Client |
| [HBASE-13014](https://issues.apache.org/jira/browse/HBASE-13014) | Java Tool For Region Moving | Major | . |
| [HBASE-14731](https://issues.apache.org/jira/browse/HBASE-14731) | Add -DuseMob option to ITBLL | Major | . |
| [HBASE-14687](https://issues.apache.org/jira/browse/HBASE-14687) | Un-synchronize BufferedMutator | Critical | Client, Performance |
| [HBASE-14721](https://issues.apache.org/jira/browse/HBASE-14721) | Memstore add cells - Avoid many garbage | Major | regionserver |
| [HBASE-14714](https://issues.apache.org/jira/browse/HBASE-14714) | some cleanup to snapshot code | Trivial | snapshots |
| [HBASE-14675](https://issues.apache.org/jira/browse/HBASE-14675) | Exorcise deprecated Put#add(...) and replace with Put#addColumn(...) | Major | . |
| [HBASE-14672](https://issues.apache.org/jira/browse/HBASE-14672) | Exorcise deprecated Delete#delete\* apis | Major | . |
| [HBASE-12769](https://issues.apache.org/jira/browse/HBASE-12769) | Replication fails to delete all corresponding zk nodes when peer is removed | Minor | Replication |
| [HBASE-14696](https://issues.apache.org/jira/browse/HBASE-14696) | Support setting allowPartialResults in mapreduce Mappers | Major | mapreduce |
| [HBASE-14266](https://issues.apache.org/jira/browse/HBASE-14266) | RegionServers have a lock contention of Configuration.getProps | Critical | regionserver |
| [HBASE-14683](https://issues.apache.org/jira/browse/HBASE-14683) | Batching in buffered mutator is awful when adding lists of mutations. | Major | Client |
| [HBASE-14670](https://issues.apache.org/jira/browse/HBASE-14670) | Remove deprecated HBaseTestCase from TestBlocksRead | Major | test |
| [HBASE-14669](https://issues.apache.org/jira/browse/HBASE-14669) | remove unused import and fix javadoc | Trivial | . |
| [HBASE-14671](https://issues.apache.org/jira/browse/HBASE-14671) | Remove deprecated HBaseTestCase/Put/Delete apis from TestGetClosestAtOrBefore | Major | test |
| [HBASE-14665](https://issues.apache.org/jira/browse/HBASE-14665) | Remove deprecated HBaseTestingUtility#createTable methods | Major | test |
| [HBASE-14668](https://issues.apache.org/jira/browse/HBASE-14668) | Remove deprecated HBaseTestCase dependency from TestHFile | Major | test |
| [HBASE-14643](https://issues.apache.org/jira/browse/HBASE-14643) | Avoid Splits from once again opening a closed reader for fetching the first and last key | Major | regionserver |
| [HBASE-14586](https://issues.apache.org/jira/browse/HBASE-14586) | Use a maven profile to run Jacoco analysis | Minor | pom |
| [HBASE-14268](https://issues.apache.org/jira/browse/HBASE-14268) | Improve KeyLocker | Minor | util |
| [HBASE-14588](https://issues.apache.org/jira/browse/HBASE-14588) | Stop accessing test resources from within src folder | Major | build, test |
| [HBASE-14587](https://issues.apache.org/jira/browse/HBASE-14587) | Attach a test-sources.jar for hbase-server | Major | build |
| [HBASE-14582](https://issues.apache.org/jira/browse/HBASE-14582) | Regionserver status webpage bucketcache list can become huge | Major | regionserver |
| [HBASE-14517](https://issues.apache.org/jira/browse/HBASE-14517) | Show regionserver's version in master status page | Minor | monitoring |
| [HBASE-14565](https://issues.apache.org/jira/browse/HBASE-14565) | Make ZK connection timeout configurable in MiniZooKeeperCluster | Major | . |
| [HBASE-14574](https://issues.apache.org/jira/browse/HBASE-14574) | TableOutputFormat#getRecordWriter javadoc misleads | Major | . |
| [HBASE-14573](https://issues.apache.org/jira/browse/HBASE-14573) | Edit on the ByteBufferedCell javadoc | Major | documentation |
| [HBASE-14436](https://issues.apache.org/jira/browse/HBASE-14436) | HTableDescriptor#addCoprocessor will always make RegionCoprocessorHost create new Configuration | Minor | Coprocessors |
| [HBASE-14520](https://issues.apache.org/jira/browse/HBASE-14520) | Optimize the number of calls for tags creation in bulk load | Major | . |
| [HBASE-14547](https://issues.apache.org/jira/browse/HBASE-14547) | Add more debug/trace to zk-procedure | Trivial | snapshots |
| [HBASE-14230](https://issues.apache.org/jira/browse/HBASE-14230) | replace reflection in FSHlog with HdfsDataOutputStream#getCurrentBlockReplication() | Minor | wal |
| [HBASE-14478](https://issues.apache.org/jira/browse/HBASE-14478) | A ThreadPoolExecutor with a LinkedBlockingQueue cannot execute tasks concurrently | Major | regionserver |
| [HBASE-14455](https://issues.apache.org/jira/browse/HBASE-14455) | Try to get rid of unused HConnection instance | Minor | . |
| [HBASE-14193](https://issues.apache.org/jira/browse/HBASE-14193) | Remove support for direct upgrade from pre-0.96 versions | Minor | . |
| [HBASE-14461](https://issues.apache.org/jira/browse/HBASE-14461) | Cleanup IncreasingToUpperBoundRegionSplitPolicy | Minor | . |
| [HBASE-14448](https://issues.apache.org/jira/browse/HBASE-14448) | Refine RegionGroupingProvider Phase-2: remove provider nesting and formalize wal group name | Major | . |
| [HBASE-14082](https://issues.apache.org/jira/browse/HBASE-14082) | Add replica id to JMX metrics names | Major | metrics |
| [HBASE-14334](https://issues.apache.org/jira/browse/HBASE-14334) | Move Memcached block cache in to it's own optional module. | Major | BlockCache, build, Operability |
| [HBASE-14306](https://issues.apache.org/jira/browse/HBASE-14306) | Refine RegionGroupingProvider: fix issues and make it more scalable | Major | wal |
| [HBASE-6617](https://issues.apache.org/jira/browse/HBASE-6617) | ReplicationSourceManager should be able to track multiple WAL paths | Major | Replication |
| [HBASE-14314](https://issues.apache.org/jira/browse/HBASE-14314) | Metrics for block cache should take region replicas into account | Major | metrics, regionserver |
| [HBASE-12988](https://issues.apache.org/jira/browse/HBASE-12988) | [Replication]Parallel apply edits across regions | Major | Replication |
| [HBASE-14261](https://issues.apache.org/jira/browse/HBASE-14261) | Enhance Chaos Monkey framework by adding zookeeper and datanode fault injections. | Major | integration tests |
| [HBASE-7972](https://issues.apache.org/jira/browse/HBASE-7972) | Add a configuration for the TCP backlog in the Thrift server | Major | Thrift |
| [HBASE-14332](https://issues.apache.org/jira/browse/HBASE-14332) | Show the table state when we encounter exception while disabling / enabling table | Minor | . |
| [HBASE-14325](https://issues.apache.org/jira/browse/HBASE-14325) | Add snapshotinfo command to hbase script | Minor | scripts |
| [HBASE-14309](https://issues.apache.org/jira/browse/HBASE-14309) | Allow load balancer to operate when there is region in transition by adding force flag | Major | . |
| [HBASE-14078](https://issues.apache.org/jira/browse/HBASE-14078) | improve error message when HMaster can't bind to port | Major | master |
| [HBASE-13127](https://issues.apache.org/jira/browse/HBASE-13127) | Add timeouts on all tests so less zombie sightings | Major | test |
| [HBASE-13996](https://issues.apache.org/jira/browse/HBASE-13996) | Add write sniffing in canary | Major | canary |
| [HBASE-14260](https://issues.apache.org/jira/browse/HBASE-14260) | don't build javadocs for hbase-protocol module | Major | build, documentation |
| [HBASE-14148](https://issues.apache.org/jira/browse/HBASE-14148) | Web UI Framable Page | Major | security, UI |
| [HBASE-14165](https://issues.apache.org/jira/browse/HBASE-14165) | The initial size of RWQueueRpcExecutor.queues should be (numWriteQueues + numReadQueues + numScanQueues) | Minor | IPC/RPC |
| [HBASE-14203](https://issues.apache.org/jira/browse/HBASE-14203) | remove duplicate code getTableDescriptor in HTable | Trivial | . |
| [HBASE-13914](https://issues.apache.org/jira/browse/HBASE-13914) | Minor improvements to dev-support/publish\_hbase\_website.sh | Minor | website |
| [HBASE-12812](https://issues.apache.org/jira/browse/HBASE-12812) | Update Netty dependency to latest release | Major | . |
| [HBASE-13985](https://issues.apache.org/jira/browse/HBASE-13985) | Add configuration to skip validating HFile format when bulk loading | Minor | . |
| [HBASE-14122](https://issues.apache.org/jira/browse/HBASE-14122) | Client API for determining if server side supports cell level security | Minor | . |
| [HBASE-14194](https://issues.apache.org/jira/browse/HBASE-14194) | Undeprecate methods in ThriftServerRunner.HBaseHandler | Trivial | . |
| [HBASE-12256](https://issues.apache.org/jira/browse/HBASE-12256) | Update patch submission guidelines to call out binary file support | Minor | documentation |
| [HBASE-13965](https://issues.apache.org/jira/browse/HBASE-13965) | Stochastic Load Balancer JMX Metrics | Major | Balancer, metrics |
| [HBASE-14164](https://issues.apache.org/jira/browse/HBASE-14164) | Display primary region replicas distribution on table.jsp | Minor | . |
| [HBASE-14097](https://issues.apache.org/jira/browse/HBASE-14097) | Log link to client scan troubleshooting section when scanner exceptions happen. | Trivial | . |
| [HBASE-14152](https://issues.apache.org/jira/browse/HBASE-14152) | Fix the warnings in Checkstyle and FindBugs brought in by merging hbase-11339 | Major | mob |
| [HBASE-14151](https://issues.apache.org/jira/browse/HBASE-14151) | Remove the unnecessary file ProtobufUtil.java.rej which is brought in by merging hbase-11339 | Major | mob |
| [HBASE-14058](https://issues.apache.org/jira/browse/HBASE-14058) | Stabilizing default heap memory tuner | Major | regionserver |
| [HBASE-14110](https://issues.apache.org/jira/browse/HBASE-14110) | Add CostFunction for balancing primary region replicas | Major | Balancer |
| [HBASE-8642](https://issues.apache.org/jira/browse/HBASE-8642) | [Snapshot] List and delete snapshot by table | Major | snapshots |
| [HBASE-14045](https://issues.apache.org/jira/browse/HBASE-14045) | Bumping thrift version to 0.9.2. | Major | . |
| [HBASE-12596](https://issues.apache.org/jira/browse/HBASE-12596) | bulkload needs to follow locality | Major | HFile, regionserver |
| [HBASE-13927](https://issues.apache.org/jira/browse/HBASE-13927) | Allow hbase-daemon.sh to conditionally redirect the log or not | Major | shell |
| [HBASE-14002](https://issues.apache.org/jira/browse/HBASE-14002) | Add --noReplicationSetup option to IntegrationTestReplication | Major | integration tests |
| [HBASE-13925](https://issues.apache.org/jira/browse/HBASE-13925) | Use zookeeper multi to clear znodes in ZKProcedureUtil | Major | Zookeeper |
| [HBASE-13500](https://issues.apache.org/jira/browse/HBASE-13500) | Deprecate KVComparator and move to CellComparator | Major | . |
| [HBASE-14015](https://issues.apache.org/jira/browse/HBASE-14015) | Allow setting a richer state value when toString a pv2 | Minor | proc-v2 |
| [HBASE-13980](https://issues.apache.org/jira/browse/HBASE-13980) | Distinguish blockedFlushCount vs unblockedFlushCount when tuning heap memory | Minor | . |
| [HBASE-13670](https://issues.apache.org/jira/browse/HBASE-13670) | [HBase MOB] ExpiredMobFileCleaner tool deletes mob files later for one more day after they are expired | Major | documentation, mob |
| [HBASE-13943](https://issues.apache.org/jira/browse/HBASE-13943) | Get rid of KeyValue#heapSizeWithoutTags | Major | . |
| [HBASE-14001](https://issues.apache.org/jira/browse/HBASE-14001) | Optimize write(OutputStream out, boolean withTags) for SizeCachedNoTagsKeyValue | Minor | . |
| [HBASE-13103](https://issues.apache.org/jira/browse/HBASE-13103) | [ergonomics] add region size balancing as a feature of master | Major | Balancer, Usability |
| [HBASE-13900](https://issues.apache.org/jira/browse/HBASE-13900) | duplicate methods between ProtobufMagic and ProtobufUtil | Minor | . |
| [HBASE-13931](https://issues.apache.org/jira/browse/HBASE-13931) | Move Unsafe based operations to UnsafeAccess | Major | . |
| [HBASE-13917](https://issues.apache.org/jira/browse/HBASE-13917) | Remove string comparison to identify request priority | Minor | regionserver |
| [HBASE-13876](https://issues.apache.org/jira/browse/HBASE-13876) | Improving performance of HeapMemoryManager | Minor | hbase, regionserver |
| [HBASE-13247](https://issues.apache.org/jira/browse/HBASE-13247) | Change BufferedMutatorExample to use addColumn() since add() is deprecated | Trivial | Client |
| [HBASE-13894](https://issues.apache.org/jira/browse/HBASE-13894) | Avoid visitor alloc each call of ByteBufferArray get/putMultiple() | Minor | regionserver |
| [HBASE-13829](https://issues.apache.org/jira/browse/HBASE-13829) | Add more ThrottleType | Major | Client |
| [HBASE-13755](https://issues.apache.org/jira/browse/HBASE-13755) | Provide single super user check implementation | Major | security |
| [HBASE-13848](https://issues.apache.org/jira/browse/HBASE-13848) | Access InfoServer SSL passwords through Credential Provder API | Major | security |
| [HBASE-13828](https://issues.apache.org/jira/browse/HBASE-13828) | Add group permissions testing coverage to AC. | Major | test |
| [HBASE-13846](https://issues.apache.org/jira/browse/HBASE-13846) | Run MiniCluster on top of other MiniDfsCluster | Minor | test |
| [HBASE-13816](https://issues.apache.org/jira/browse/HBASE-13816) | Build shaded modules only in release profile | Major | build |
| [HBASE-13344](https://issues.apache.org/jira/browse/HBASE-13344) | Add enforcer rule that matches our JDK support statement | Minor | build |
| [HBASE-13761](https://issues.apache.org/jira/browse/HBASE-13761) | Optimize FuzzyRowFilter | Minor | Filters |
| [HBASE-13710](https://issues.apache.org/jira/browse/HBASE-13710) | Remove use of Hadoop's ReflectionUtil in favor of our own. | Minor | . |
| [HBASE-13780](https://issues.apache.org/jira/browse/HBASE-13780) | Default to 700 for HDFS root dir permissions for secure deployments | Major | Operability, security |
| [HBASE-13671](https://issues.apache.org/jira/browse/HBASE-13671) | More classes to add to the invoking repository of org.apache.hadoop.hbase.mapreduce.driver | Major | mapreduce |
| [HBASE-13745](https://issues.apache.org/jira/browse/HBASE-13745) | Say why a flush was requested in log message | Minor | Operability |
| [HBASE-13645](https://issues.apache.org/jira/browse/HBASE-13645) | Rename \*column methods in MasterObserver to \*columnFamily | Minor | . |
| [HBASE-13725](https://issues.apache.org/jira/browse/HBASE-13725) | [documentation] Pseudo-Distributed Local Install can link to hadoop instructions | Minor | . |
| [HBASE-13656](https://issues.apache.org/jira/browse/HBASE-13656) | Rename getDeadServers to getDeadServersSize in Admin | Minor | . |
| [HBASE-13675](https://issues.apache.org/jira/browse/HBASE-13675) | ProcedureExecutor completion report should be at DEBUG log level | Minor | . |
| [HBASE-13673](https://issues.apache.org/jira/browse/HBASE-13673) | WALProcedureStore procedure is chatty | Minor | . |
| [HBASE-13677](https://issues.apache.org/jira/browse/HBASE-13677) | RecoverableZookeeper WARNs on expected events | Minor | . |
| [HBASE-13684](https://issues.apache.org/jira/browse/HBASE-13684) | Allow mlockagent to be used when not starting as root | Minor | . |
| [HBASE-13655](https://issues.apache.org/jira/browse/HBASE-13655) | Deprecate duplicate getCompression methods in HColumnDescriptor | Minor | . |
| [HBASE-13251](https://issues.apache.org/jira/browse/HBASE-13251) | Correct 'HBase, MapReduce, and the CLASSPATH' section in HBase Ref Guide | Major | documentation |
| [HBASE-13598](https://issues.apache.org/jira/browse/HBASE-13598) | Make hbase assembly 'attach' to the project | Minor | . |
| [HBASE-12415](https://issues.apache.org/jira/browse/HBASE-12415) | Add add(byte[][] arrays) to Bytes. | Major | API, Client |
| [HBASE-13358](https://issues.apache.org/jira/browse/HBASE-13358) | Upgrade VisibilityClient API to accept Connection object. | Minor | API, security |
| [HBASE-13420](https://issues.apache.org/jira/browse/HBASE-13420) | RegionEnvironment.offerExecutionLatency Blocks Threads under Heavy Load | Major | Coprocessors, metrics, Performance |
| [HBASE-13351](https://issues.apache.org/jira/browse/HBASE-13351) | Annotate internal MasterRpcServices methods with admin priority | Major | master |
| [HBASE-13431](https://issues.apache.org/jira/browse/HBASE-13431) | Allow to skip store file range check based on column family while creating reference files in HRegionFileSystem#splitStoreFile | Major | . |
| [HBASE-13578](https://issues.apache.org/jira/browse/HBASE-13578) | Remove Arrays.asList().subList() from FSHLog.offer() | Trivial | wal |
| [HBASE-13518](https://issues.apache.org/jira/browse/HBASE-13518) | Typo in hbase.hconnection.meta.lookup.threads.core parameter | Major | . |
| [HBASE-13516](https://issues.apache.org/jira/browse/HBASE-13516) | Increase PermSize to 128MB | Major | . |
| [HBASE-13255](https://issues.apache.org/jira/browse/HBASE-13255) | Bad grammar in RegionServer status page | Trivial | monitoring |
| [HBASE-13334](https://issues.apache.org/jira/browse/HBASE-13334) | FindBugs should create precise report for new bugs introduced | Minor | build |
| [HBASE-13550](https://issues.apache.org/jira/browse/HBASE-13550) | [Shell] Support unset of a list of table attributes | Minor | . |
| [HBASE-13552](https://issues.apache.org/jira/browse/HBASE-13552) | ChoreService shutdown message could be more informative | Trivial | . |
| [HBASE-13534](https://issues.apache.org/jira/browse/HBASE-13534) | Change HBase master WebUI to explicitly mention if it is a backup master | Minor | master, UI |
| [HBASE-13456](https://issues.apache.org/jira/browse/HBASE-13456) | Improve HFilePrettyPrinter first hbase:meta region processing | Minor | util |
| [HBASE-12987](https://issues.apache.org/jira/browse/HBASE-12987) | HBCK should print status while scanning over many regions | Major | hbck, Usability |
| [HBASE-13350](https://issues.apache.org/jira/browse/HBASE-13350) | Add a debug-warn if we fail HTD checks even if table.sanity.checks is false | Trivial | master, Operability |
| [HBASE-13453](https://issues.apache.org/jira/browse/HBASE-13453) | Master should not bind to region server ports | Critical | . |
| [HBASE-13419](https://issues.apache.org/jira/browse/HBASE-13419) | Thrift gateway should propagate text from exception causes. | Major | Thrift |
| [HBASE-13436](https://issues.apache.org/jira/browse/HBASE-13436) | Include user name in ADE for scans | Minor | . |
| [HBASE-13381](https://issues.apache.org/jira/browse/HBASE-13381) | Expand TestSizeFailures to include small scans | Minor | test |
| [HBASE-13270](https://issues.apache.org/jira/browse/HBASE-13270) | Setter for Result#getStats is #addResults; confusing! | Major | Client |
| [HBASE-13362](https://issues.apache.org/jira/browse/HBASE-13362) | Set max result size from client only (like scanner caching). | Major | . |
| [HBASE-11864](https://issues.apache.org/jira/browse/HBASE-11864) | Enhance HLogPrettyPrinter to print information from WAL Header | Minor | . |
| [HBASE-13370](https://issues.apache.org/jira/browse/HBASE-13370) | PE tool could give option for using Explicit Column Tracker which leads to seeks | Major | . |
| [HBASE-6919](https://issues.apache.org/jira/browse/HBASE-6919) | Remove unnecessary throws IOException from Bytes.readVLong | Minor | . |
| [HBASE-12891](https://issues.apache.org/jira/browse/HBASE-12891) | Parallel execution for Hbck checkRegionConsistency | Major | hbck |
| [HBASE-13341](https://issues.apache.org/jira/browse/HBASE-13341) | Add option to disable filtering on interface annotations for the API compatibility report | Minor | . |
| [HBASE-13340](https://issues.apache.org/jira/browse/HBASE-13340) | Include LimitedPrivate interfaces in the API compatibility report | Minor | API |
| [HBASE-13366](https://issues.apache.org/jira/browse/HBASE-13366) | Throw DoNotRetryIOException instead of read only IOException | Minor | . |
| [HBASE-13345](https://issues.apache.org/jira/browse/HBASE-13345) | Fix LocalHBaseCluster so that different region server impl can be used for different slaves | Minor | . |
| [HBASE-13348](https://issues.apache.org/jira/browse/HBASE-13348) | Separate the thread number configs for meta server and server operations | Minor | master |
| [HBASE-12975](https://issues.apache.org/jira/browse/HBASE-12975) | Supportable SplitTransaction and RegionMergeTransaction interfaces | Major | . |
| [HBASE-13369](https://issues.apache.org/jira/browse/HBASE-13369) | Expose scanNext stats to region server level | Major | . |
| [HBASE-13222](https://issues.apache.org/jira/browse/HBASE-13222) | Provide means of non-destructive balancer inspection | Minor | Balancer |
| [HBASE-13316](https://issues.apache.org/jira/browse/HBASE-13316) | Reduce the downtime on planned moves of regions | Minor | Balancer |
| [HBASE-13342](https://issues.apache.org/jira/browse/HBASE-13342) | Fix incorrect interface annotations | Major | . |
| [HBASE-13199](https://issues.apache.org/jira/browse/HBASE-13199) | Some small improvements on canary tool | Major | . |
| [HBASE-13286](https://issues.apache.org/jira/browse/HBASE-13286) | Minimum timeout for a rpc call could be 1 ms instead of 2 seconds | Minor | Client |
| [HBASE-13241](https://issues.apache.org/jira/browse/HBASE-13241) | Add tests for group level grants | Critical | security, test |
| [HBASE-13235](https://issues.apache.org/jira/browse/HBASE-13235) | Revisit the security auditing semantics. | Major | . |
| [HBASE-13216](https://issues.apache.org/jira/browse/HBASE-13216) | Add version info in RPC connection header | Minor | Client, IPC/RPC |
| [HBASE-13109](https://issues.apache.org/jira/browse/HBASE-13109) | Make better SEEK vs SKIP decisions during scanning | Major | . |
| [HBASE-13256](https://issues.apache.org/jira/browse/HBASE-13256) | HBaseConfiguration#checkDefaultsVersion(Configuration) has spelling error | Trivial | Client |
| [HBASE-13223](https://issues.apache.org/jira/browse/HBASE-13223) | Add testMoveMeta to IntegrationTestMTTR | Major | integration tests |
| [HBASE-13240](https://issues.apache.org/jira/browse/HBASE-13240) | add an exemption to test-patch for build-only changes. | Minor | build |
| [HBASE-13236](https://issues.apache.org/jira/browse/HBASE-13236) | Clean up m2e-related warnings/errors from poms | Minor | build |
| [HBASE-13162](https://issues.apache.org/jira/browse/HBASE-13162) | Add capability for cleaning hbase acls to hbase cleanup script. | Minor | . |
| [HBASE-12405](https://issues.apache.org/jira/browse/HBASE-12405) | WAL accounting by Store | Major | wal |
| [HBASE-13185](https://issues.apache.org/jira/browse/HBASE-13185) | Document hbase.regionserver.thrift.framed.max\_frame\_size\_in\_mb more clearly | Trivial | documentation |
| [HBASE-13183](https://issues.apache.org/jira/browse/HBASE-13183) | Make ZK tickTime configurable in standalone HBase | Minor | master |
| [HBASE-12706](https://issues.apache.org/jira/browse/HBASE-12706) | Support multiple port numbers in ZK quorum string | Critical | . |
| [HBASE-13142](https://issues.apache.org/jira/browse/HBASE-13142) | [PERF] Reuse the IPCUtil#buildCellBlock buffer | Major | Performance |
| [HBASE-13122](https://issues.apache.org/jira/browse/HBASE-13122) | Improve efficiency for return codes of some filters | Major | Filters |
| [HBASE-13128](https://issues.apache.org/jira/browse/HBASE-13128) | Make HBCK's lock file retry creation and deletion | Minor | hbck |
| [HBASE-13100](https://issues.apache.org/jira/browse/HBASE-13100) | Shell command to retrieve table splits | Minor | shell |
| [HBASE-13132](https://issues.apache.org/jira/browse/HBASE-13132) | Improve RemoveColumn action debug message | Trivial | integration tests |
| [HBASE-13138](https://issues.apache.org/jira/browse/HBASE-13138) | Clean up TestMasterObserver (debug, trying to figure why fails) | Major | test |
| [HBASE-13120](https://issues.apache.org/jira/browse/HBASE-13120) | Allow disabling hadoop classpath and native library lookup | Major | hbase |
| [HBASE-13086](https://issues.apache.org/jira/browse/HBASE-13086) | Show ZK root node on Master WebUI | Minor | master |
| [HBASE-13080](https://issues.apache.org/jira/browse/HBASE-13080) | Hbase shell message containing extra quote at the end of error message. | Trivial | . |
| [HBASE-13054](https://issues.apache.org/jira/browse/HBASE-13054) | Provide more tracing information for locking/latching events. | Major | . |
| [HBASE-13056](https://issues.apache.org/jira/browse/HBASE-13056) | Refactor table.jsp code to remove repeated code and make it easier to add new checks | Major | . |
| [HBASE-13002](https://issues.apache.org/jira/browse/HBASE-13002) | Make encryption cipher configurable | Major | . |
| [HBASE-13059](https://issues.apache.org/jira/browse/HBASE-13059) | Set executable bit for scripts in dev-support | Trivial | scripts |
| [HBASE-13044](https://issues.apache.org/jira/browse/HBASE-13044) | Configuration option for disabling coprocessor loading | Minor | . |
| [HBASE-13018](https://issues.apache.org/jira/browse/HBASE-13018) | WALSplitter should not try to get table states while splitting META | Critical | . |
| [HBASE-13016](https://issues.apache.org/jira/browse/HBASE-13016) | Clean up remnants of table states stored in table descriptors | Major | . |
| [HBASE-12035](https://issues.apache.org/jira/browse/HBASE-12035) | Keep table state in META | Critical | Client, master |
| [HBASE-12982](https://issues.apache.org/jira/browse/HBASE-12982) | Adding timeouts to TestChoreService | Major | . |
| [HBASE-12957](https://issues.apache.org/jira/browse/HBASE-12957) | region\_mover#isSuccessfulScan may be extremely slow on region with lots of expired data | Minor | scripts |
| [HBASE-8329](https://issues.apache.org/jira/browse/HBASE-8329) | Limit compaction speed | Major | Compaction |
| [HBASE-12808](https://issues.apache.org/jira/browse/HBASE-12808) | Use Java API Compliance Checker for binary/source compatibility | Major | test |
| [HBASE-12627](https://issues.apache.org/jira/browse/HBASE-12627) | Add back snapshot batching facility from HBASE-11360 dropped by HBASE-11742 | Major | master, scaling |
| [HBASE-12896](https://issues.apache.org/jira/browse/HBASE-12896) | checkstyle report diff tool | Minor | build |
| [HBASE-12887](https://issues.apache.org/jira/browse/HBASE-12887) | Cleanup many checkstyle errors in o.a.h.h.client | Minor | build, Client |
| [HBASE-12840](https://issues.apache.org/jira/browse/HBASE-12840) | Improve unit test coverage of the client pushback mechanism | Major | . |
| [HBASE-12620](https://issues.apache.org/jira/browse/HBASE-12620) | Add HBASE-11639 related items to Ref Guide | Major | documentation |
| [HBASE-7541](https://issues.apache.org/jira/browse/HBASE-7541) | Convert all tests that use HBaseTestingUtility.createMultiRegions to HBA.createTable | Major | . |
| [HBASE-11144](https://issues.apache.org/jira/browse/HBASE-11144) | Filter to support scanning multiple row key ranges | Major | Filters |
| [HBASE-12839](https://issues.apache.org/jira/browse/HBASE-12839) | Remove synchronization in ServerStatisticsTracker | Minor | . |
| [HBASE-12796](https://issues.apache.org/jira/browse/HBASE-12796) | Clean up HTable and HBaseAdmin deprecated constructor usage | Major | . |
| [HBASE-12761](https://issues.apache.org/jira/browse/HBASE-12761) | On region jump ClientScanners should get next row start key instead of a skip. | Major | . |
| [HBASE-11869](https://issues.apache.org/jira/browse/HBASE-11869) | Support snapshot owner | Minor | . |
| [HBASE-12429](https://issues.apache.org/jira/browse/HBASE-12429) | Add port to ClusterManager's actions. | Major | integration tests |
| [HBASE-12590](https://issues.apache.org/jira/browse/HBASE-12590) | A solution for data skew in HBase-Mapreduce Job | Major | mapreduce |
| [HBASE-12223](https://issues.apache.org/jira/browse/HBASE-12223) | MultiTableInputFormatBase.getSplits is too slow | Minor | Client |
| [HBASE-10201](https://issues.apache.org/jira/browse/HBASE-10201) | Port 'Make flush decisions per column family' to trunk | Major | wal |
| [HBASE-12601](https://issues.apache.org/jira/browse/HBASE-12601) | Explain how to grant/revoke permission to a group/namespace in grant/revoke command usage | Minor | documentation, security, shell |
| [HBASE-12650](https://issues.apache.org/jira/browse/HBASE-12650) | Move ServerName to hbase-common module | Blocker | . |
| [HBASE-12559](https://issues.apache.org/jira/browse/HBASE-12559) | Provide LoadBalancer with online configuration capability | Major | . |
| [HBASE-11939](https://issues.apache.org/jira/browse/HBASE-11939) | Document compressed blockcache | Major | documentation |
| [HBASE-12207](https://issues.apache.org/jira/browse/HBASE-12207) | A script to help keep your Git repo fresh | Major | documentation, scripts |
| [HBASE-12251](https://issues.apache.org/jira/browse/HBASE-12251) | [book] Hadoop compat matrix 0.94 section needs cleaned up | Major | documentation |
| [HBASE-12220](https://issues.apache.org/jira/browse/HBASE-12220) | Add hedgedReads and hedgedReadWins metrics | Major | . |
| [HBASE-12195](https://issues.apache.org/jira/browse/HBASE-12195) | Fix dev-support/findHangingTests | Minor | test |
| [HBASE-12003](https://issues.apache.org/jira/browse/HBASE-12003) | Fix SecureBulkLoadEndpoint class javadoc formatting | Trivial | documentation, security |
| [HBASE-6290](https://issues.apache.org/jira/browse/HBASE-6290) | Add a function a mark a server as dead and start the recovery the process | Minor | monitoring |
| [HBASE-11862](https://issues.apache.org/jira/browse/HBASE-11862) | Get rid of Writables in HTableDescriptor, HColumnDescriptor | Minor | . |
| [HBASE-11760](https://issues.apache.org/jira/browse/HBASE-11760) | Tighten up region state transition | Major | Region Assignment |
| [HBASE-11611](https://issues.apache.org/jira/browse/HBASE-11611) | Clean up ZK-based region assignment | Major | Region Assignment |
| [HBASE-11585](https://issues.apache.org/jira/browse/HBASE-11585) | PE: Allows warm-up | Trivial | test |
| [HBASE-3135](https://issues.apache.org/jira/browse/HBASE-3135) | Make our MR jobs implement Tool and use ToolRunner so can do -D trickery, etc. | Major | . |
| [HBASE-11548](https://issues.apache.org/jira/browse/HBASE-11548) | [PE] Add 'cycling' test N times and unit tests for size/zipf/valueSize calculations | Trivial | test |
| [HBASE-11400](https://issues.apache.org/jira/browse/HBASE-11400) | Edit, consolidate, and update Compression and data encoding docs | Minor | documentation |
| [HBASE-5696](https://issues.apache.org/jira/browse/HBASE-5696) | Use Hadoop's DataOutputOutputStream instead of have a copy local | Major | . |
| [HBASE-11344](https://issues.apache.org/jira/browse/HBASE-11344) | Hide row keys and such from the web UIs | Major | . |
| [HBASE-6580](https://issues.apache.org/jira/browse/HBASE-6580) | Deprecate HTablePool in favor of HConnection.getTable(...) | Major | . |
### BUG FIXES:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-19924](https://issues.apache.org/jira/browse/HBASE-19924) | hbase rpc throttling does not work for multi() with request count rater. | Major | rpc |
| [HBASE-20293](https://issues.apache.org/jira/browse/HBASE-20293) | get\_splits returns duplicate split points when region replication is on | Minor | shell |
| [HBASE-20464](https://issues.apache.org/jira/browse/HBASE-20464) | Disable IMC | Major | in-memory-compaction |
| [HBASE-20442](https://issues.apache.org/jira/browse/HBASE-20442) | clean up incorrect use of commons-collections 3 | Major | dependencies, thirdparty |
| [HBASE-20440](https://issues.apache.org/jira/browse/HBASE-20440) | Clean up incorrect use of commons-lang 2.y | Major | dependencies |
| [HBASE-20439](https://issues.apache.org/jira/browse/HBASE-20439) | Clean up incorrect use of commons-logging in hbase-server | Minor | dependencies, logging |
| [HBASE-20398](https://issues.apache.org/jira/browse/HBASE-20398) | Redirect doesn't work on web UI | Major | UI |
| [HBASE-20399](https://issues.apache.org/jira/browse/HBASE-20399) | Fix merge layout | Minor | UI |
| [HBASE-20233](https://issues.apache.org/jira/browse/HBASE-20233) | [metrics] Ill-formatted numRegions metric in "Hadoop:service=HBase,name=RegionServer,sub=Regions" mbean | Trivial | metrics, Operability |
| [HBASE-20410](https://issues.apache.org/jira/browse/HBASE-20410) | upgrade protoc compiler to 3.5.1-1 | Critical | build, dependencies, Protobufs |
| [HBASE-20224](https://issues.apache.org/jira/browse/HBASE-20224) | Web UI is broken in standalone mode | Blocker | UI, Usability |
| [HBASE-20394](https://issues.apache.org/jira/browse/HBASE-20394) | HBase over rides the value of HBASE\_OPTS (if any) set by client | Minor | Operability |
| [HBASE-20397](https://issues.apache.org/jira/browse/HBASE-20397) | Make it more explicit that monkey.properties is found on CLASSPATH | Trivial | . |
| [HBASE-20376](https://issues.apache.org/jira/browse/HBASE-20376) | RowCounter and CellCounter documentations are incorrect | Minor | documentation, mapreduce |
| [HBASE-20330](https://issues.apache.org/jira/browse/HBASE-20330) | ProcedureExecutor.start() gets stuck in recover lease on store. | Major | proc-v2 |
| [HBASE-20350](https://issues.apache.org/jira/browse/HBASE-20350) | NullPointerException in Scanner during close() | Blocker | . |
| [HBASE-20280](https://issues.apache.org/jira/browse/HBASE-20280) | Fix possibility of deadlocking in refreshFileConnections when prefetch is enabled | Major | BucketCache |
| [HBASE-20310](https://issues.apache.org/jira/browse/HBASE-20310) | [hbck] bin/hbase hbck -metaonly shows false inconsistency on HBase 2 | Major | hbck |
| [HBASE-20219](https://issues.apache.org/jira/browse/HBASE-20219) | An error occurs when scanning with reversed=true and loadColumnFamiliesOnDemand=true | Critical | phoenix |
| [HBASE-20358](https://issues.apache.org/jira/browse/HBASE-20358) | Fix bin/hbase thrift usage text | Minor | . |
| [HBASE-20382](https://issues.apache.org/jira/browse/HBASE-20382) | If RSGroups not enabled, rsgroup.jsp prints stack trace | Major | rsgroup, UI |
| [HBASE-20385](https://issues.apache.org/jira/browse/HBASE-20385) | Purge md5-making from our little make\_rc.sh script | Minor | . |
| [HBASE-20384](https://issues.apache.org/jira/browse/HBASE-20384) | [AMv2] Logging format improvements; use encoded name rather than full region name marking transitions | Minor | . |
| [HBASE-20182](https://issues.apache.org/jira/browse/HBASE-20182) | Can not locate region after split and merge | Blocker | Region Assignment |
| [HBASE-20363](https://issues.apache.org/jira/browse/HBASE-20363) | TestNamespaceAuditor.testRegionMerge is flaky | Major | test |
| [HBASE-20362](https://issues.apache.org/jira/browse/HBASE-20362) | TestMasterShutdown.testMasterShutdownBeforeStartingAnyRegionServer is flaky | Major | test |
| [HBASE-20295](https://issues.apache.org/jira/browse/HBASE-20295) | TableOutputFormat.checkOutputSpecs throw NullPointerException Exception | Major | mapreduce |
| [HBASE-20343](https://issues.apache.org/jira/browse/HBASE-20343) | [DOC] fix log directory paths | Critical | documentation |
| [HBASE-16499](https://issues.apache.org/jira/browse/HBASE-16499) | slow replication for small HBase clusters | Critical | Replication |
| [HBASE-17518](https://issues.apache.org/jira/browse/HBASE-17518) | HBase Reference Guide has a syntax error | Minor | documentation |
| [HBASE-20231](https://issues.apache.org/jira/browse/HBASE-20231) | Not able to delete column family from a row using RemoteHTable | Major | REST |
| [HBASE-20259](https://issues.apache.org/jira/browse/HBASE-20259) | Doc configs for in-memory-compaction and add detail to in-memory-compaction logging | Critical | . |
| [HBASE-17631](https://issues.apache.org/jira/browse/HBASE-17631) | Canary interval too low | Major | canary |
| [HBASE-20282](https://issues.apache.org/jira/browse/HBASE-20282) | Provide short name invocations for useful tools | Major | documentation, tooling |
| [HBASE-20314](https://issues.apache.org/jira/browse/HBASE-20314) | Precommit build for master branch fails because of surefire fork fails | Major | build |
| [HBASE-20261](https://issues.apache.org/jira/browse/HBASE-20261) | Table page (table.jsp) in Master UI does not show replicaIds for hbase meta table | Minor | UI |
| [HBASE-20229](https://issues.apache.org/jira/browse/HBASE-20229) | ConnectionImplementation.locateRegions() returns duplicated entries when region replication is on | Major | . |
| [HBASE-20308](https://issues.apache.org/jira/browse/HBASE-20308) | test Dockerfile needs to include git | Blocker | build, test |
| [HBASE-20130](https://issues.apache.org/jira/browse/HBASE-20130) | Use defaults (16020 & 16030) as base ports when the RS is bound to localhost | Critical | documentation |
| [HBASE-20111](https://issues.apache.org/jira/browse/HBASE-20111) | Able to split region explicitly even on shouldSplit return false from split policy | Critical | . |
| [HBASE-20292](https://issues.apache.org/jira/browse/HBASE-20292) | Wrong URLs in the descriptions for update\_all\_config and update\_config commands in shell | Trivial | shell |
| [HBASE-13300](https://issues.apache.org/jira/browse/HBASE-13300) | Fix casing in getTimeStamp() and setTimestamp() for Mutations | Critical | API |
| [HBASE-20237](https://issues.apache.org/jira/browse/HBASE-20237) | Put back getClosestRowBefore and throw UnknownProtocolException instead... for asynchbase client | Critical | compatibility, Operability |
| [HBASE-20090](https://issues.apache.org/jira/browse/HBASE-20090) | Properly handle Preconditions check failure in MemStoreFlusher$FlushHandler.run | Major | . |
| [HBASE-19639](https://issues.apache.org/jira/browse/HBASE-19639) | ITBLL can't go big because RegionTooBusyException... Above memstore limit | Blocker | . |
| [HBASE-20213](https://issues.apache.org/jira/browse/HBASE-20213) | [LOGGING] Aligning formatting and logging less (compactions, in-memory compactions) | Major | logging |
| [HBASE-20141](https://issues.apache.org/jira/browse/HBASE-20141) | Fix TooManyFiles exception when RefreshingChannels in FileIOEngine | Major | BucketCache |
| [HBASE-18216](https://issues.apache.org/jira/browse/HBASE-18216) | [AMv2] Workaround for HBASE-18152, corrupt procedure WAL | Major | proc-v2 |
| [HBASE-20200](https://issues.apache.org/jira/browse/HBASE-20200) | list\_procedures fails in shell | Major | shell |
| [HBASE-20185](https://issues.apache.org/jira/browse/HBASE-20185) | Fix ACL check for MasterRpcServices#execProcedure | Major | . |
| [HBASE-20146](https://issues.apache.org/jira/browse/HBASE-20146) | Regions are stuck while opening when WAL is disabled | Critical | wal |
| [HBASE-20187](https://issues.apache.org/jira/browse/HBASE-20187) | Shell startup fails with IncompatibleClassChangeError | Blocker | shell |
| [HBASE-20189](https://issues.apache.org/jira/browse/HBASE-20189) | Typo in Required Java Version error message while building HBase. | Trivial | build |
| [HBASE-20078](https://issues.apache.org/jira/browse/HBASE-20078) | MultiByteBuff : bug in reading primitives when individual buffers are too small | Major | . |
| [HBASE-19075](https://issues.apache.org/jira/browse/HBASE-19075) | Task tabs on master UI cause page scroll | Major | master |
| [HBASE-20104](https://issues.apache.org/jira/browse/HBASE-20104) | Fix infinite loop of RIT when creating table on a rsgroup that has no online servers | Major | rsgroup |
| [HBASE-19802](https://issues.apache.org/jira/browse/HBASE-19802) | Wrong usage messages on shell commands (grant/revoke namespace syntax) | Minor | shell |
| [HBASE-20153](https://issues.apache.org/jira/browse/HBASE-20153) | enable error-prone analysis in precommit | Major | community |
| [HBASE-20024](https://issues.apache.org/jira/browse/HBASE-20024) | TestMergeTableRegionsProcedure is STILL flakey | Major | . |
| [HBASE-19598](https://issues.apache.org/jira/browse/HBASE-19598) | Fix TestAssignmentManagerMetrics flaky test | Major | test |
| [HBASE-20162](https://issues.apache.org/jira/browse/HBASE-20162) | [nightly] depending on pipeline execution we sometimes refer to the wrong workspace | Critical | test |
| [HBASE-20164](https://issues.apache.org/jira/browse/HBASE-20164) | failed hadoopcheck should add footer link | Major | community |
| [HBASE-20160](https://issues.apache.org/jira/browse/HBASE-20160) | TestRestartCluster.testRetainAssignmentOnRestart uses the wrong condition to decide whether the assignment is finished | Major | Region Assignment |
| [HBASE-20114](https://issues.apache.org/jira/browse/HBASE-20114) | Fix IllegalFormatConversionException in rsgroup.jsp | Major | UI |
| [HBASE-20144](https://issues.apache.org/jira/browse/HBASE-20144) | The shutdown of master will hang if there are no live region server | Major | Recovery |
| [HBASE-19987](https://issues.apache.org/jira/browse/HBASE-19987) | update error-prone to 2.2.0 | Major | . |
| [HBASE-20108](https://issues.apache.org/jira/browse/HBASE-20108) | \`hbase zkcli\` falls into a non-interactive prompt after HBASE-15199 | Critical | Usability |
| [HBASE-19814](https://issues.apache.org/jira/browse/HBASE-19814) | Release hbase-2.0.0-beta-2; "rolling upgrade" release | Blocker | . |
| [HBASE-20134](https://issues.apache.org/jira/browse/HBASE-20134) | support scripts use hard-coded /tmp | Minor | website |
| [HBASE-20070](https://issues.apache.org/jira/browse/HBASE-20070) | website generation is failing | Blocker | website |
| [HBASE-19147](https://issues.apache.org/jira/browse/HBASE-19147) | All branch-2 unit tests pass | Blocker | test |
| [HBASE-20110](https://issues.apache.org/jira/browse/HBASE-20110) | Findbugs in zk and mr caused nightly #409 branch-2 to fail | Major | findbugs |
| [HBASE-19656](https://issues.apache.org/jira/browse/HBASE-19656) | Disable TestAssignmentManagerMetrics for beta-1 | Major | . |
| [HBASE-19863](https://issues.apache.org/jira/browse/HBASE-19863) | java.lang.IllegalStateException: isDelete failed when SingleColumnValueFilter is used | Major | Filters |
| [HBASE-20106](https://issues.apache.org/jira/browse/HBASE-20106) | API Compliance checker should fall back to specifying origin as remote repo | Major | API, community |
| [HBASE-20066](https://issues.apache.org/jira/browse/HBASE-20066) | Region sequence id may go backward after split or merge | Critical | . |
| [HBASE-20086](https://issues.apache.org/jira/browse/HBASE-20086) | PE randomSeekScan fails with ClassNotFoundException | Major | . |
| [HBASE-20074](https://issues.apache.org/jira/browse/HBASE-20074) | [FindBugs] Same code on both branches in CompactingMemStore#initMemStoreCompactor | Major | findbugs |
| [HBASE-19974](https://issues.apache.org/jira/browse/HBASE-19974) | Fix decommissioned servers cannot be removed by remove\_servers\_rsgroup methods | Major | rsgroup |
| [HBASE-20043](https://issues.apache.org/jira/browse/HBASE-20043) | ITBLL fails against hadoop3 | Major | integration tests |
| [HBASE-19583](https://issues.apache.org/jira/browse/HBASE-19583) | update RM list to remove EOM versions | Minor | community, documentation |
| [HBASE-19728](https://issues.apache.org/jira/browse/HBASE-19728) | Add lock to filesCompacting in all place. | Major | . |
| [HBASE-20061](https://issues.apache.org/jira/browse/HBASE-20061) | HStore synchronized member variable filesCompacting should be private | Major | regionserver |
| [HBASE-20062](https://issues.apache.org/jira/browse/HBASE-20062) | findbugs is not running on precommit checks | Blocker | community, test |
| [HBASE-20054](https://issues.apache.org/jira/browse/HBASE-20054) | Forward port HBASE-18282 ReplicationLogCleaner can delete WALs not yet replicated in case of KeeperException | Major | . |
| [HBASE-20049](https://issues.apache.org/jira/browse/HBASE-20049) | Region replicas of SPLIT and MERGED regions are kept in in-memory states until restarting master | Major | read replicas |
| [HBASE-19767](https://issues.apache.org/jira/browse/HBASE-19767) | Master web UI shows negative values for Remaining KVs | Major | . |
| [HBASE-19391](https://issues.apache.org/jira/browse/HBASE-19391) | Calling HRegion#initializeRegionInternals from a region replica can still re-create a region directory | Major | . |
| [HBASE-19166](https://issues.apache.org/jira/browse/HBASE-19166) | AsyncProtobufLogWriter persists ProtobufLogWriter as class name for backward compatibility | Blocker | wal |
| [HBASE-20027](https://issues.apache.org/jira/browse/HBASE-20027) | Add test TestClusterPortAssignment | Major | . |
| [HBASE-19953](https://issues.apache.org/jira/browse/HBASE-19953) | Avoid calling post\* hook when procedure fails | Critical | master, proc-v2 |
| [HBASE-20037](https://issues.apache.org/jira/browse/HBASE-20037) | Race when calling SequenceIdAccounting.resetHighest | Blocker | wal |
| [HBASE-19991](https://issues.apache.org/jira/browse/HBASE-19991) | lots of hbase-rest test failures against hadoop 3 | Major | REST, test |
| [HBASE-19920](https://issues.apache.org/jira/browse/HBASE-19920) | TokenUtil.obtainToken unnecessarily creates a local directory | Major | . |
| [HBASE-20017](https://issues.apache.org/jira/browse/HBASE-20017) | BufferedMutatorImpl submit the same mutation repeatedly | Blocker | Client |
| [HBASE-20032](https://issues.apache.org/jira/browse/HBASE-20032) | Receving multiple warnings for missing reporting.plugins.plugin.version | Minor | hbase |
| [HBASE-19954](https://issues.apache.org/jira/browse/HBASE-19954) | Separate TestBlockReorder into individual tests to avoid ShutdownHook suppression error against hadoop3 | Major | . |
| [HBASE-20023](https://issues.apache.org/jira/browse/HBASE-20023) | CompactionTool command line examples are incorrect | Trivial | hbase |
| [HBASE-14897](https://issues.apache.org/jira/browse/HBASE-14897) | TestTableLockManager.testReapAllTableLocks is flakey | Major | . |
| [HBASE-20020](https://issues.apache.org/jira/browse/HBASE-20020) | Make sure we throw DoNotRetryIOException when ConnectionImplementation is closed | Critical | Client |
| [HBASE-19980](https://issues.apache.org/jira/browse/HBASE-19980) | NullPointerException when restoring a snapshot after splitting a region | Major | snapshots |
| [HBASE-19998](https://issues.apache.org/jira/browse/HBASE-19998) | Flakey TestVisibilityLabelsWithDefaultVisLabelService | Major | flakey, test |
| [HBASE-19996](https://issues.apache.org/jira/browse/HBASE-19996) | Some nonce procs might not be cleaned up (follow up HBASE-19756) | Major | . |
| [HBASE-18282](https://issues.apache.org/jira/browse/HBASE-18282) | ReplicationLogCleaner can delete WALs not yet replicated in case of a KeeperException | Critical | Replication |
| [HBASE-19979](https://issues.apache.org/jira/browse/HBASE-19979) | ReplicationSyncUp tool may leak Zookeeper connection | Major | Replication |
| [HBASE-19876](https://issues.apache.org/jira/browse/HBASE-19876) | The exception happening in converting pb mutation to hbase.mutation messes up the CellScanner | Critical | . |
| [HBASE-19977](https://issues.apache.org/jira/browse/HBASE-19977) | FileMmapEngine allocation of byte buffers should be synchronized | Major | . |
| [HBASE-19986](https://issues.apache.org/jira/browse/HBASE-19986) | If HBaseTestClassRule timesout a test, thread dump. | Major | . |
| [HBASE-19968](https://issues.apache.org/jira/browse/HBASE-19968) | MapReduce test fails with NoClassDefFoundError against hadoop3 | Major | . |
| [HBASE-16060](https://issues.apache.org/jira/browse/HBASE-16060) | 1.x clients cannot access table state talking to 2.0 cluster | Blocker | . |
| [HBASE-19972](https://issues.apache.org/jira/browse/HBASE-19972) | Should rethrow the RetriesExhaustedWithDetailsException when failed to apply the batch in ReplicationSink | Critical | Replication |
| [HBASE-19964](https://issues.apache.org/jira/browse/HBASE-19964) | TestWriteHeavyIncrementObserver fails | Major | test |
| [HBASE-19966](https://issues.apache.org/jira/browse/HBASE-19966) | The WriteEntry for WALKey maybe null if we failed to call WAL.append | Major | wal |
| [HBASE-19937](https://issues.apache.org/jira/browse/HBASE-19937) | Ensure createRSGroupTable be called after ProcedureExecutor and LoadBalancer are initialized | Major | rsgroup |
| [HBASE-19929](https://issues.apache.org/jira/browse/HBASE-19929) | Call RS.stop on a session expired RS may hang | Major | wal |
| [HBASE-19900](https://issues.apache.org/jira/browse/HBASE-19900) | Region-level exception destroy the result of batch | Critical | . |
| [HBASE-19941](https://issues.apache.org/jira/browse/HBASE-19941) | Flaky TestCreateTableProcedure times out in nightly, needs to LargeTests | Major | test |
| [HBASE-19934](https://issues.apache.org/jira/browse/HBASE-19934) | HBaseSnapshotException when read replicas is enabled and online snapshot is taken after region splitting | Major | snapshots |
| [HBASE-19939](https://issues.apache.org/jira/browse/HBASE-19939) | TestSplitTableRegionProcedure#testSplitWithoutPONR() and testRecoveryAndDoubleExecution() are failing with NPE | Major | amv2 |
| [HBASE-19907](https://issues.apache.org/jira/browse/HBASE-19907) | TestMetaWithReplicas still flakey | Major | . |
| [HBASE-19907](https://issues.apache.org/jira/browse/HBASE-19907) | TestMetaWithReplicas still flakey | Major | . |
| [HBASE-19926](https://issues.apache.org/jira/browse/HBASE-19926) | Use a separated class to implement the WALActionListener for Replication | Major | Replication, wal |
| [HBASE-19703](https://issues.apache.org/jira/browse/HBASE-19703) | Functionality added as part of HBASE-12583 is not working after moving the split code to master | Major | . |
| [HBASE-19658](https://issues.apache.org/jira/browse/HBASE-19658) | Fix and reenable TestCompactingToCellFlatMapMemStore#testFlatteningToJumboCellChunkMap | Major | test |
| [HBASE-19905](https://issues.apache.org/jira/browse/HBASE-19905) | ReplicationSyncUp tool will not exit if a peer replication is disabled | Major | Replication |
| [HBASE-19726](https://issues.apache.org/jira/browse/HBASE-19726) | Failed to start HMaster due to infinite retrying on meta assign | Major | . |
| [HBASE-19919](https://issues.apache.org/jira/browse/HBASE-19919) | Tidying up logging | Major | . |
| [HBASE-19901](https://issues.apache.org/jira/browse/HBASE-19901) | Up yetus proclimit on nightlies | Major | . |
| [HBASE-19884](https://issues.apache.org/jira/browse/HBASE-19884) | BucketEntryGroup's equals, hashCode and compareTo methods are not consistent | Major | . |
| [HBASE-19906](https://issues.apache.org/jira/browse/HBASE-19906) | TestZooKeeper Timeout | Major | . |
| [HBASE-19892](https://issues.apache.org/jira/browse/HBASE-19892) | Checking 'patch attach' and yetus 0.7.0 and move to Yetus 0.7.0 | Major | . |
| [HBASE-19871](https://issues.apache.org/jira/browse/HBASE-19871) | delete.rb should require user to provide the column | Major | shell |
| [HBASE-19818](https://issues.apache.org/jira/browse/HBASE-19818) | Scan time limit not work if the filter always filter row key | Major | . |
| [HBASE-19756](https://issues.apache.org/jira/browse/HBASE-19756) | Master NPE during completed failed proc eviction | Major | . |
| [HBASE-17079](https://issues.apache.org/jira/browse/HBASE-17079) | HBase build fails on windows, hbase-archetype-builder is reason for failure | Major | build |
| [HBASE-19853](https://issues.apache.org/jira/browse/HBASE-19853) | duplicate slf4j declaration in mapreduce pom | Minor | dependencies |
| [HBASE-19838](https://issues.apache.org/jira/browse/HBASE-19838) | Can not shutdown backup master cleanly when it has already tried to become the active master | Critical | master |
| [HBASE-19780](https://issues.apache.org/jira/browse/HBASE-19780) | Change execution phase of checkstyle plugin back to default 'verify' | Major | . |
| [HBASE-19774](https://issues.apache.org/jira/browse/HBASE-19774) | incorrect behavior of locateRegionInMeta | Major | . |
| [HBASE-17513](https://issues.apache.org/jira/browse/HBASE-17513) | Thrift Server 1 uses different QOP settings than RPC and Thrift Server 2 and can easily be misconfigured so there is no encryption when the operator expects it. | Critical | documentation, security, Thrift, Usability |
| [HBASE-19836](https://issues.apache.org/jira/browse/HBASE-19836) | Fix TestZooKeeper.testLogSplittingAfterMasterRecoveryDueToZKExpiry | Major | test |
| [HBASE-19794](https://issues.apache.org/jira/browse/HBASE-19794) | TestZooKeeper hangs | Critical | . |
| [HBASE-19828](https://issues.apache.org/jira/browse/HBASE-19828) | Flakey TestRegionsOnMasterOptions.testRegionsOnAllServers | Major | . |
| [HBASE-19829](https://issues.apache.org/jira/browse/HBASE-19829) | hadoop-minicluster pulls zookeeper:test-jar:tests 3.4.6 | Minor | . |
| [HBASE-19163](https://issues.apache.org/jira/browse/HBASE-19163) | "Maximum lock count exceeded" from region server's batch processing | Major | regionserver |
| [HBASE-19757](https://issues.apache.org/jira/browse/HBASE-19757) | System table gets stuck after enabling region server group feature in secure cluster | Critical | . |
| [HBASE-19825](https://issues.apache.org/jira/browse/HBASE-19825) | Fix hadoop3 compat test failures | Major | pom |
| [HBASE-19822](https://issues.apache.org/jira/browse/HBASE-19822) | HFileCleaner threads stick around after shutdown stuck on queue#take | Major | . |
| [HBASE-19815](https://issues.apache.org/jira/browse/HBASE-19815) | Flakey TestAssignmentManager.testAssignWithRandExec | Major | flakey, test |
| [HBASE-19821](https://issues.apache.org/jira/browse/HBASE-19821) | TestCleanerChore#testOnConfigurationChange() requires at least 4 processors to get passed | Minor | test |
| [HBASE-19806](https://issues.apache.org/jira/browse/HBASE-19806) | Lower max versions for table column family of hbase:meta | Trivial | . |
| [HBASE-19812](https://issues.apache.org/jira/browse/HBASE-19812) | TestFlushSnapshotFromClient fails because of failing region.flush | Major | . |
| [HBASE-19816](https://issues.apache.org/jira/browse/HBASE-19816) | Replication sink list is not updated on UnknownHostException | Major | Replication |
| [HBASE-19784](https://issues.apache.org/jira/browse/HBASE-19784) | stop-hbase gives unfriendly message when local hbase isn't running | Minor | scripts |
| [HBASE-19196](https://issues.apache.org/jira/browse/HBASE-19196) | Release hbase-2.0.0-beta-1; the "Finish-line" release | Blocker | . |
| [HBASE-19808](https://issues.apache.org/jira/browse/HBASE-19808) | Reenable TestMultiParallel | Major | test |
| [HBASE-19792](https://issues.apache.org/jira/browse/HBASE-19792) | TestReplicationSmallTests.testDisableEnable fails | Major | test |
| [HBASE-19797](https://issues.apache.org/jira/browse/HBASE-19797) | Operator priority leads to wrong logic in ReplicationSourceWALReader | Major | . |
| [HBASE-19732](https://issues.apache.org/jira/browse/HBASE-19732) | Replica regions does not return back the MSLAB chunks to pool | Critical | . |
| [HBASE-19768](https://issues.apache.org/jira/browse/HBASE-19768) | RegionServer startup failing when DN is dead | Critical | . |
| [HBASE-19752](https://issues.apache.org/jira/browse/HBASE-19752) | RSGroupBasedLoadBalancer#getMisplacedRegions() should handle the case where rs group cannot be determined | Major | . |
| [HBASE-11409](https://issues.apache.org/jira/browse/HBASE-11409) | Add more flexibility for input directory structure to LoadIncrementalHFiles | Major | . |
| [HBASE-19694](https://issues.apache.org/jira/browse/HBASE-19694) | The initialization order for a fresh cluster is incorrect | Critical | . |
| [HBASE-19769](https://issues.apache.org/jira/browse/HBASE-19769) | IllegalAccessError on package-private Hadoop metrics2 classes in MapReduce jobs | Critical | mapreduce, metrics |
| [HBASE-19775](https://issues.apache.org/jira/browse/HBASE-19775) | hbase shell doesn't handle the exceptions that are wrapped in java.io.UncheckedIOException | Major | shell |
| [HBASE-19771](https://issues.apache.org/jira/browse/HBASE-19771) | restore\_snapshot shell command gives wrong namespace if the namespace doesn't exist | Minor | . |
| [HBASE-19773](https://issues.apache.org/jira/browse/HBASE-19773) | Adding javadoc around getting instance of RawCellBuilder | Minor | . |
| [HBASE-19685](https://issues.apache.org/jira/browse/HBASE-19685) | Fix TestFSErrorsExposed#testFullSystemBubblesFSErrors | Major | test |
| [HBASE-19755](https://issues.apache.org/jira/browse/HBASE-19755) | Error message for non-existent namespace is inaccurate | Minor | . |
| [HBASE-19749](https://issues.apache.org/jira/browse/HBASE-19749) | Revisit logic of UserScanQueryMatcher#mergeFilterResponse method | Major | . |
| [HBASE-19740](https://issues.apache.org/jira/browse/HBASE-19740) | Repeated error message for NamespaceExistException | Minor | . |
| [HBASE-19734](https://issues.apache.org/jira/browse/HBASE-19734) | IntegrationTestReplication broken w/ separate clusters | Critical | integration tests |
| [HBASE-19729](https://issues.apache.org/jira/browse/HBASE-19729) | UserScanQueryMatcher#mergeFilterResponse should return INCLUDE\_AND\_SEEK\_NEXT\_ROW when filterResponse is INCLUDE\_AND\_SEEK\_NEXT\_ROW | Major | . |
| [HBASE-19744](https://issues.apache.org/jira/browse/HBASE-19744) | Fix flakey TestZKLeaderManager | Major | test |
| [HBASE-19717](https://issues.apache.org/jira/browse/HBASE-19717) | IntegrationTestDDLMasterFailover is using outdated values for DataBlockEncoding | Major | integration tests |
| [HBASE-19424](https://issues.apache.org/jira/browse/HBASE-19424) | Metrics servlet throws NPE | Minor | . |
| [HBASE-19712](https://issues.apache.org/jira/browse/HBASE-19712) | Fix TestSnapshotQuotaObserverChore#testSnapshotSize | Major | test |
| [HBASE-19696](https://issues.apache.org/jira/browse/HBASE-19696) | Filter returning INCLUDE\_AND\_NEXT\_COL doesn't skip remaining versions when scan has explicit columns | Critical | . |
| [HBASE-19721](https://issues.apache.org/jira/browse/HBASE-19721) | Unnecessary stubbings detected in test class: TestReversedScannerCallable | Major | test |
| [HBASE-19714](https://issues.apache.org/jira/browse/HBASE-19714) | \`status 'detailed'\` invokes nonexistent "getRegionsInTransition" method on ClusterStatus | Critical | shell |
| [HBASE-19709](https://issues.apache.org/jira/browse/HBASE-19709) | Guard against a ThreadPool size of 0 in CleanerChore | Critical | . |
| [HBASE-19383](https://issues.apache.org/jira/browse/HBASE-19383) | [1.2] java.lang.AssertionError: expected:\<2\> but was:\<1\> at org.apache.hadoop.hbase.TestChoreService.testTriggerNowFailsWhenNotScheduled(TestChoreService.java:707) | Major | test |
| [HBASE-19688](https://issues.apache.org/jira/browse/HBASE-19688) | TimeToLiveProcedureWALCleaner should extends BaseLogCleanerDelegate | Minor | . |
| [HBASE-18452](https://issues.apache.org/jira/browse/HBASE-18452) | VerifyReplication by Snapshot should cache HDFS token before submit job for kerberos env. | Major | . |
| [HBASE-19588](https://issues.apache.org/jira/browse/HBASE-19588) | Additional jar dependencies needed for mapreduce PerformanceEvaluation | Minor | test |
| [HBASE-19490](https://issues.apache.org/jira/browse/HBASE-19490) | Rare failure in TestRateLimiter | Major | test |
| [HBASE-19691](https://issues.apache.org/jira/browse/HBASE-19691) | Do not require ADMIN permission for obtaining ClusterStatus | Critical | . |
| [HBASE-19392](https://issues.apache.org/jira/browse/HBASE-19392) | TestReplicaWithCluster#testReplicaGetWithPrimaryAndMetaDown failure in master | Minor | regionserver |
| [HBASE-19654](https://issues.apache.org/jira/browse/HBASE-19654) | Remove misleading and chatty debug message in ReplicationLogCleaner | Major | . |
| [HBASE-19666](https://issues.apache.org/jira/browse/HBASE-19666) | TestDefaultCompactSelection test failed | Critical | test |
| [HBASE-19671](https://issues.apache.org/jira/browse/HBASE-19671) | Fix TestMultiParallel#testActiveThreadsCount | Minor | test |
| [HBASE-19672](https://issues.apache.org/jira/browse/HBASE-19672) | Correct comments for default values of major compaction in SortedCompactionPolicy#getNextMajorCompactTime() | Minor | . |
| [HBASE-19643](https://issues.apache.org/jira/browse/HBASE-19643) | Need to update cache location when get error in AsyncBatchRpcRetryingCaller | Major | . |
| [HBASE-19619](https://issues.apache.org/jira/browse/HBASE-19619) | Modify replication\_admin.rb to use ReplicationPeerConfigBuilder | Critical | . |
| [HBASE-19624](https://issues.apache.org/jira/browse/HBASE-19624) | TestIOFencing hangs | Major | . |
| [HBASE-19496](https://issues.apache.org/jira/browse/HBASE-19496) | Reusing the ByteBuffer in rpc layer corrupt the ServerLoad and RegionLoad | Blocker | . |
| [HBASE-19457](https://issues.apache.org/jira/browse/HBASE-19457) | Debugging flaky TestTruncateTableProcedure#testRecoveryAndDoubleExecutionPreserveSplits | Major | . |
| [HBASE-19608](https://issues.apache.org/jira/browse/HBASE-19608) | Race in MasterRpcServices.getProcedureResult | Major | proc-v2 |
| [HBASE-19593](https://issues.apache.org/jira/browse/HBASE-19593) | Possible NPE if wal is closed during waledit append. | Major | . |
| [HBASE-19589](https://issues.apache.org/jira/browse/HBASE-19589) | New regions should always be added with state CLOSED (followup of HBASE-19530) | Major | . |
| [HBASE-17248](https://issues.apache.org/jira/browse/HBASE-17248) | SimpleRegionNormalizer javadoc correction | Trivial | master |
| [HBASE-19148](https://issues.apache.org/jira/browse/HBASE-19148) | Reevaluate default values of configurations | Blocker | defaults |
| [HBASE-19578](https://issues.apache.org/jira/browse/HBASE-19578) | MasterProcWALs cleaning is incorrect | Critical | amv2 |
| [HBASE-19559](https://issues.apache.org/jira/browse/HBASE-19559) | Fix TestLogRolling.testLogRollOnDatanodeDeath | Major | test, wal |
| [HBASE-19218](https://issues.apache.org/jira/browse/HBASE-19218) | Master stuck thinking hbase:namespace is assigned after restart preventing intialization | Critical | . |
| [HBASE-19542](https://issues.apache.org/jira/browse/HBASE-19542) | fix TestSafemodeBringsDownMaster | Major | . |
| [HBASE-19563](https://issues.apache.org/jira/browse/HBASE-19563) | A few hbase-procedure classes missing @InterfaceAudience annotation | Minor | proc-v2 |
| [HBASE-19561](https://issues.apache.org/jira/browse/HBASE-19561) | maxCacheSize in CacheEvictionStats can't be accumulated repeatedly When dealing with each region | Major | . |
| [HBASE-19558](https://issues.apache.org/jira/browse/HBASE-19558) | TestRegionsOnMasterOptions hack so it works reliablly | Major | test |
| [HBASE-19555](https://issues.apache.org/jira/browse/HBASE-19555) | TestSplitTransactionOnCluster is flaky | Major | test |
| [HBASE-19532](https://issues.apache.org/jira/browse/HBASE-19532) | AssignProcedure#COMPARATOR may produce incorrect sort order | Critical | . |
| [HBASE-19549](https://issues.apache.org/jira/browse/HBASE-19549) | Change path comparison in CommonFSUtils | Major | . |
| [HBASE-19546](https://issues.apache.org/jira/browse/HBASE-19546) | TestMasterReplication.testCyclicReplication2 uses wrong assertion | Major | Replication, test |
| [HBASE-19522](https://issues.apache.org/jira/browse/HBASE-19522) | The complete order may be wrong in AsyncBufferedMutatorImpl | Major | . |
| [HBASE-19530](https://issues.apache.org/jira/browse/HBASE-19530) | New regions should always be added with state CLOSED | Major | . |
| [HBASE-19509](https://issues.apache.org/jira/browse/HBASE-19509) | RSGroupAdminEndpoint#preCreateTable triggers TableNotFoundException | Minor | . |
| [HBASE-18352](https://issues.apache.org/jira/browse/HBASE-18352) | Enable TestMasterOperationsForRegionReplicas#testCreateTableWithMultipleReplicas disabled by Proc-V2 AM in HBASE-14614 | Major | test |
| [HBASE-18838](https://issues.apache.org/jira/browse/HBASE-18838) | shaded artifacts are incorrect when built against hadoop 3 | Critical | Client |
| [HBASE-18946](https://issues.apache.org/jira/browse/HBASE-18946) | Stochastic load balancer assigns replica regions to the same RS | Major | . |
| [HBASE-19516](https://issues.apache.org/jira/browse/HBASE-19516) | IntegrationTestBulkLoad and IntegrationTestImportTsv run into 'java.lang.RuntimeException: DistributedHBaseCluster@1bb564e2 not an instance of MiniHBaseCluster' | Major | . |
| [HBASE-19513](https://issues.apache.org/jira/browse/HBASE-19513) | Fix the wrapped AsyncFSOutput implementation | Major | wal |
| [HBASE-19511](https://issues.apache.org/jira/browse/HBASE-19511) | Splits causes blocks to be cached again and so such blocks cannot be evicted from bucket cache | Critical | BucketCache |
| [HBASE-19510](https://issues.apache.org/jira/browse/HBASE-19510) | TestDistributedLogSplitting is flakey for AsyncFSWAL | Critical | Recovery, test |
| [HBASE-19287](https://issues.apache.org/jira/browse/HBASE-19287) | master hangs forever if RecoverMeta send assign meta region request to target server fail | Major | proc-v2 |
| [HBASE-19503](https://issues.apache.org/jira/browse/HBASE-19503) | Fix TestWALOpenAfterDNRollingStart for AsyncFSWAL | Major | Replication, wal |
| [HBASE-19434](https://issues.apache.org/jira/browse/HBASE-19434) | create\_namespace command for existing namespace does not throw useful error message | Minor | . |
| [HBASE-19484](https://issues.apache.org/jira/browse/HBASE-19484) | The value array written by ExtendedCell#write is out of bounds | Blocker | . |
| [HBASE-19508](https://issues.apache.org/jira/browse/HBASE-19508) | ReadOnlyConfiguration throws exception if any Configuration in current context calls addDefautlResource | Major | conf |
| [HBASE-19456](https://issues.apache.org/jira/browse/HBASE-19456) | RegionMover's region server hostname option is no longer case insensitive | Major | tooling |
| [HBASE-19495](https://issues.apache.org/jira/browse/HBASE-19495) | Fix failed ut TestShell | Major | . |
| [HBASE-19394](https://issues.apache.org/jira/browse/HBASE-19394) | Support multi-homing env for the publication of RS status with multicast (hbase.status.published) | Major | Client, master |
| [HBASE-19493](https://issues.apache.org/jira/browse/HBASE-19493) | Make TestWALMonotonicallyIncreasingSeqId also work with AsyncFSWAL | Major | test |
| [HBASE-19371](https://issues.apache.org/jira/browse/HBASE-19371) | Running WALPerformanceEvaluation against asyncfswal throws exceptions | Major | . |
| [HBASE-19134](https://issues.apache.org/jira/browse/HBASE-19134) | Make WALKey an Interface; expose Read-Only version to CPs | Major | Coprocessors, wal |
| [HBASE-19461](https://issues.apache.org/jira/browse/HBASE-19461) | TestRSGroups is broke | Major | test |
| [HBASE-19433](https://issues.apache.org/jira/browse/HBASE-19433) | ChangeSplitPolicyAction modifies an immutable HTableDescriptor | Critical | integration tests |
| [HBASE-19454](https://issues.apache.org/jira/browse/HBASE-19454) | Debugging TestDistributedLogSplitting#testThreeRSAbort | Major | . |
| [HBASE-19349](https://issues.apache.org/jira/browse/HBASE-19349) | Introduce wrong version depencency of servlet-api jar | Critical | . |
| [HBASE-19435](https://issues.apache.org/jira/browse/HBASE-19435) | Reopen Files for ClosedChannelException in BucketCache | Major | BucketCache |
| [HBASE-12444](https://issues.apache.org/jira/browse/HBASE-12444) | Total number of requests overflow because it's int | Minor | hbck, master, regionserver |
| [HBASE-19447](https://issues.apache.org/jira/browse/HBASE-19447) | INFO level logging of GetClusterStatus from HMaster is too chatty | Major | . |
| [HBASE-19417](https://issues.apache.org/jira/browse/HBASE-19417) | Remove boolean return value from postBulkLoadHFile hook | Major | . |
| [HBASE-19445](https://issues.apache.org/jira/browse/HBASE-19445) | PerformanceEvaluation NPE processing split policy option | Trivial | . |
| [HBASE-19023](https://issues.apache.org/jira/browse/HBASE-19023) | Usage for rowcounter in refguide is out of sync with code | Major | . |
| [HBASE-19422](https://issues.apache.org/jira/browse/HBASE-19422) | using hadoop-profile property leads to confusing failures | Major | . |
| [HBASE-19384](https://issues.apache.org/jira/browse/HBASE-19384) | Results returned by preAppend hook in a coprocessor are replaced with null from other coprocessor even on bypass | Critical | Coprocessors |
| [HBASE-19431](https://issues.apache.org/jira/browse/HBASE-19431) | The tag array written by IndividualBytesFieldCell#write is out of bounds | Critical | . |
| [HBASE-18942](https://issues.apache.org/jira/browse/HBASE-18942) | hbase-hadoop2-compat module ignores hadoop-3 profile | Major | . |
| [HBASE-19056](https://issues.apache.org/jira/browse/HBASE-19056) | TestCompactionInDeadRegionServer is top of the flakies charts! | Major | test |
| [HBASE-19339](https://issues.apache.org/jira/browse/HBASE-19339) | Eager policy results in the negative size of memstore | Critical | . |
| [HBASE-16239](https://issues.apache.org/jira/browse/HBASE-16239) | Better logging for RPC related exceptions | Major | . |
| [HBASE-19396](https://issues.apache.org/jira/browse/HBASE-19396) | Fix flaky test TestHTableMultiplexerFlushCache | Minor | test |
| [HBASE-19406](https://issues.apache.org/jira/browse/HBASE-19406) | Fix CompactionRequest equals and hashCode | Major | . |
| [HBASE-19285](https://issues.apache.org/jira/browse/HBASE-19285) | Add per-table latency histograms | Critical | metrics |
| [HBASE-19390](https://issues.apache.org/jira/browse/HBASE-19390) | Revert to older version of Jetty 9.3 | Major | . |
| [HBASE-19385](https://issues.apache.org/jira/browse/HBASE-19385) | [1.3] TestReplicator failed 1.3 nightly | Major | test |
| [HBASE-19350](https://issues.apache.org/jira/browse/HBASE-19350) | TestMetaWithReplicas is flaky | Major | . |
| [HBASE-19388](https://issues.apache.org/jira/browse/HBASE-19388) | Incorrect value is being set for Compaction Pressure in RegionLoadStats object inside HRegion class | Minor | regionserver |
| [HBASE-19386](https://issues.apache.org/jira/browse/HBASE-19386) | HBase UnsafeAvailChecker returns false on Arm64 | Minor | . |
| [HBASE-19363](https://issues.apache.org/jira/browse/HBASE-19363) | Tests under TestCheckAndMutate are identical | Minor | . |
| [HBASE-19035](https://issues.apache.org/jira/browse/HBASE-19035) | Miss metrics when coprocessor use region scanner to read data | Major | . |
| [HBASE-19351](https://issues.apache.org/jira/browse/HBASE-19351) | Deprecated is missing in Table implementations | Minor | . |
| [HBASE-19355](https://issues.apache.org/jira/browse/HBASE-19355) | Missing dependency on hbase-zookeeper module causes CopyTable to fail | Major | . |
| [HBASE-19335](https://issues.apache.org/jira/browse/HBASE-19335) | Fix waitUntilAllRegionsAssigned | Major | . |
| [HBASE-19318](https://issues.apache.org/jira/browse/HBASE-19318) | MasterRpcServices#getSecurityCapabilities explicitly checks for the HBase AccessController implementation | Critical | master, security |
| [HBASE-19319](https://issues.apache.org/jira/browse/HBASE-19319) | Fix bug in synchronizing over ProcedureEvent | Major | . |
| [HBASE-19325](https://issues.apache.org/jira/browse/HBASE-19325) | Pass a list of server name to postClearDeadServers | Major | . |
| [HBASE-19337](https://issues.apache.org/jira/browse/HBASE-19337) | AsyncMetaTableAccessor may hang when call ScanController.terminate many times | Major | . |
| [HBASE-19332](https://issues.apache.org/jira/browse/HBASE-19332) | DumpReplicationQueues misreports total WAL size | Trivial | Replication |
| [HBASE-19310](https://issues.apache.org/jira/browse/HBASE-19310) | Verify IntegrationTests don't rely on Rules outside of JUnit context | Critical | integration tests |
| [HBASE-19317](https://issues.apache.org/jira/browse/HBASE-19317) | Increase "yarn.nodemanager.disk-health-checker.max-disk-utilization-per-disk-percentage" to avoid host-related failures on MiniMRCluster | Major | integration tests, test |
| [HBASE-19330](https://issues.apache.org/jira/browse/HBASE-19330) | Remove duplicated dependency from hbase-rest | Trivial | dependencies |
| [HBASE-19321](https://issues.apache.org/jira/browse/HBASE-19321) | ZKAsyncRegistry ctor would hang when zookeeper cluster is not available | Major | . |
| [HBASE-19315](https://issues.apache.org/jira/browse/HBASE-19315) | Incorrect snapshot version is used for 2.0.0-beta-1 | Minor | . |
| [HBASE-19304](https://issues.apache.org/jira/browse/HBASE-19304) | KEEP\_DELETED\_CELLS should ignore case | Blocker | regionserver |
| [HBASE-19260](https://issues.apache.org/jira/browse/HBASE-19260) | Add lock back to avoid parallel accessing meta to locate region | Major | . |
| [HBASE-19181](https://issues.apache.org/jira/browse/HBASE-19181) | LogRollBackupSubprocedure will fail if we use AsyncFSWAL instead of FSHLog | Major | backup&restore |
| [HBASE-18356](https://issues.apache.org/jira/browse/HBASE-18356) | Enable TestFavoredStochasticBalancerPickers#testPickers that was disabled by Proc-V2 AM in HBASE-14614 | Major | test |
| [HBASE-18357](https://issues.apache.org/jira/browse/HBASE-18357) | Enable disabled tests in TestHCM that were disabled by Proc-V2 AM in HBASE-14614 | Major | test |
| [HBASE-19223](https://issues.apache.org/jira/browse/HBASE-19223) | Remove references to Date Tiered compaction from branch-1.2 and branch-1.1 ref guide | Critical | Compaction, documentation |
| [HBASE-19255](https://issues.apache.org/jira/browse/HBASE-19255) | PerformanceEvaluation class not found when run PE test | Major | . |
| [HBASE-19245](https://issues.apache.org/jira/browse/HBASE-19245) | MultiTableInputFormatBase#getSplits creates a Connection per Table | Minor | mapreduce |
| [HBASE-12091](https://issues.apache.org/jira/browse/HBASE-12091) | Optionally ignore edits for dropped tables for replication. | Major | . |
| [HBASE-19210](https://issues.apache.org/jira/browse/HBASE-19210) | TestNamespacesInstanceResource fails | Major | . |
| [HBASE-19249](https://issues.apache.org/jira/browse/HBASE-19249) | test for "hbase antipatterns" should check \_count\_ of occurance rather than text of | Critical | build |
| [HBASE-19240](https://issues.apache.org/jira/browse/HBASE-19240) | Fix error-prone errors, part four? | Major | . |
| [HBASE-19215](https://issues.apache.org/jira/browse/HBASE-19215) | Incorrect exception handling on the client causes incorrect call timeouts and byte buffer allocations on the server | Major | rpc |
| [HBASE-19250](https://issues.apache.org/jira/browse/HBASE-19250) | TestClientClusterStatus is flaky | Trivial | . |
| [HBASE-19246](https://issues.apache.org/jira/browse/HBASE-19246) | Trivial fix in findHangingTests.py | Trivial | . |
| [HBASE-19244](https://issues.apache.org/jira/browse/HBASE-19244) | Fix simple typos in HBASE-15518 descriptions | Trivial | . |
| [HBASE-19089](https://issues.apache.org/jira/browse/HBASE-19089) | Fix the list of included moduleSets in src and binary tars | Major | build |
| [HBASE-19229](https://issues.apache.org/jira/browse/HBASE-19229) | Nightly script to check source artifact should not do a destructive git operation without opt-in | Critical | build |
| [HBASE-19199](https://issues.apache.org/jira/browse/HBASE-19199) | RatioBasedCompactionPolicy#shouldPerformMajorCompaction() always return true when only one file needs to compact | Major | . |
| [HBASE-19195](https://issues.apache.org/jira/browse/HBASE-19195) | More error-prone fixes | Major | . |
| [HBASE-19165](https://issues.apache.org/jira/browse/HBASE-19165) | TODO Handle stuck in transition: rit=OPENING, location=ve0538.... | Critical | migration |
| [HBASE-19184](https://issues.apache.org/jira/browse/HBASE-19184) | clean up nightly source artifact test to match expectations from switch to git-archive | Critical | build |
| [HBASE-19211](https://issues.apache.org/jira/browse/HBASE-19211) | B&R: update configuration string in BackupRestoreConstants | Minor | . |
| [HBASE-19194](https://issues.apache.org/jira/browse/HBASE-19194) | TestRSGroupsBase has some always false checks | Blocker | rsgroup, test |
| [HBASE-19088](https://issues.apache.org/jira/browse/HBASE-19088) | move\_tables\_rsgroup will throw an exception when the table is disabled | Major | rsgroup |
| [HBASE-19198](https://issues.apache.org/jira/browse/HBASE-19198) | TestIPv6NIOServerSocketChannel fails; unable to bind | Minor | test |
| [HBASE-19102](https://issues.apache.org/jira/browse/HBASE-19102) | TestZooKeeperMainServer fails with KeeperException$ConnectionLossException | Major | . |
| [HBASE-18844](https://issues.apache.org/jira/browse/HBASE-18844) | Release hbase-2.0.0-alpha-4; Theme "Coprocessor API Cleanup" | Major | . |
| [HBASE-19111](https://issues.apache.org/jira/browse/HBASE-19111) | Add missing CellUtil#isPut(Cell) methods | Critical | Client |
| [HBASE-19160](https://issues.apache.org/jira/browse/HBASE-19160) | Re-expose CellComparator | Critical | . |
| [HBASE-19185](https://issues.apache.org/jira/browse/HBASE-19185) | ClassNotFoundException: com.fasterxml.jackson.\* | Critical | mapreduce |
| [HBASE-18983](https://issues.apache.org/jira/browse/HBASE-18983) | Upgrade to latest error-prone | Major | build |
| [HBASE-19178](https://issues.apache.org/jira/browse/HBASE-19178) | table.rb use undefined method 'getType' for Cell interface | Trivial | . |
| [HBASE-19117](https://issues.apache.org/jira/browse/HBASE-19117) | Avoid NPE occurring while active master dies | Minor | . |
| [HBASE-19173](https://issues.apache.org/jira/browse/HBASE-19173) | Configure IntegrationTestRSGroup automatically for minicluster mode | Minor | rsgroup, test |
| [HBASE-19144](https://issues.apache.org/jira/browse/HBASE-19144) | [RSgroups] Retry assignments in FAILED\_OPEN state when servers (re)join the cluster | Major | rsgroup |
| [HBASE-19124](https://issues.apache.org/jira/browse/HBASE-19124) | Move HBase-Nightly source artifact creation test from JenkinsFile to a script in dev-support | Major | test |
| [HBASE-19156](https://issues.apache.org/jira/browse/HBASE-19156) | Duplicative regions\_per\_server options on LoadTestTool | Trivial | test |
| [HBASE-19118](https://issues.apache.org/jira/browse/HBASE-19118) | Use SaslUtil to set Sasl.QOP in 'Thrift' | Major | Thrift |
| [HBASE-19150](https://issues.apache.org/jira/browse/HBASE-19150) | TestSnapshotWithAcl is flaky | Minor | . |
| [HBASE-19120](https://issues.apache.org/jira/browse/HBASE-19120) | IllegalArgumentException from ZNodeClearer when master shuts down | Major | . |
| [HBASE-19065](https://issues.apache.org/jira/browse/HBASE-19065) | HRegion#bulkLoadHFiles() should wait for concurrent Region#flush() to finish | Major | . |
| [HBASE-19100](https://issues.apache.org/jira/browse/HBASE-19100) | Missing break in catch block of InterruptedException in HRegion#waitForFlushesAndCompactions | Major | . |
| [HBASE-19137](https://issues.apache.org/jira/browse/HBASE-19137) | Nightly test should make junit reports optional rather than attempt archive after reporting. | Critical | build |
| [HBASE-19135](https://issues.apache.org/jira/browse/HBASE-19135) | TestWeakObjectPool time out | Major | . |
| [HBASE-19138](https://issues.apache.org/jira/browse/HBASE-19138) | Rare failure in TestLruBlockCache | Trivial | test |
| [HBASE-19030](https://issues.apache.org/jira/browse/HBASE-19030) | nightly runs should attempt to log test results after archiving | Critical | test |
| [HBASE-19130](https://issues.apache.org/jira/browse/HBASE-19130) | Typo in HStore.initializeRegionInternals for replaying wal | Critical | Recovery |
| [HBASE-19087](https://issues.apache.org/jira/browse/HBASE-19087) | Log an Optional's value/null instead of Optional[value]/Optional.empty. | Major | . |
| [HBASE-19129](https://issues.apache.org/jira/browse/HBASE-19129) | TestChoreService is flaky (branch-1 / branch-1.4) | Trivial | . |
| [HBASE-19119](https://issues.apache.org/jira/browse/HBASE-19119) | hbase-http shouldn't have a native profile | Blocker | build |
| [HBASE-18438](https://issues.apache.org/jira/browse/HBASE-18438) | Precommit doesn't warn about unused imports | Critical | build |
| [HBASE-18922](https://issues.apache.org/jira/browse/HBASE-18922) | Fix all dead links in our HBase book | Major | documentation |
| [HBASE-19094](https://issues.apache.org/jira/browse/HBASE-19094) | NPE in RSGroupStartupWorker.waitForGroupTableOnline during master startup | Minor | . |
| [HBASE-13346](https://issues.apache.org/jira/browse/HBASE-13346) | Clean up Filter package for post 1.0 s/KeyValue/Cell/g | Critical | API, Filters |
| [HBASE-19098](https://issues.apache.org/jira/browse/HBASE-19098) | Python based compatiblity checker fails if git repo does not have a remote named 'origin' | Critical | tooling |
| [HBASE-19077](https://issues.apache.org/jira/browse/HBASE-19077) | Have Region\*CoprocessorEnvironment provide an ImmutableOnlineRegions | Critical | Coprocessors |
| [HBASE-19073](https://issues.apache.org/jira/browse/HBASE-19073) | Cleanup CoordinatedStateManager | Major | . |
| [HBASE-19054](https://issues.apache.org/jira/browse/HBASE-19054) | Switch precommit docker image to one based on maven images | Major | build, community |
| [HBASE-19018](https://issues.apache.org/jira/browse/HBASE-19018) | Use of hadoop internals that require bouncycastle should declare bouncycastle dependency | Critical | dependencies, test |
| [HBASE-19021](https://issues.apache.org/jira/browse/HBASE-19021) | Restore a few important missing logics for balancer in 2.0 | Critical | . |
| [HBASE-19066](https://issues.apache.org/jira/browse/HBASE-19066) | Correct the directory of openjdk-8 for jenkins | Major | build |
| [HBASE-16290](https://issues.apache.org/jira/browse/HBASE-16290) | Dump summary of callQueue content; can help debugging | Major | Operability |
| [HBASE-18846](https://issues.apache.org/jira/browse/HBASE-18846) | Accommodate the hbase-indexer/lily/SEP consumer deploy-type | Major | . |
| [HBASE-19072](https://issues.apache.org/jira/browse/HBASE-19072) | Missing break in catch block of InterruptedException in HRegion#waitForFlushes() | Major | . |
| [HBASE-19058](https://issues.apache.org/jira/browse/HBASE-19058) | The wget isn't installed in building docker image | Major | build |
| [HBASE-19039](https://issues.apache.org/jira/browse/HBASE-19039) | refactor shadedjars test to only run on java changes. | Major | build |
| [HBASE-19060](https://issues.apache.org/jira/browse/HBASE-19060) | "Hadoop check" test is running all the time instead of just when changes to java | Critical | build |
| [HBASE-19061](https://issues.apache.org/jira/browse/HBASE-19061) | enforcer NPE on hbase-shaded-invariants | Blocker | build |
| [HBASE-19014](https://issues.apache.org/jira/browse/HBASE-19014) | surefire fails; When writing xml report stdout/stderr ... No such file or directory | Major | . |
| [HBASE-19042](https://issues.apache.org/jira/browse/HBASE-19042) | Oracle Java 8u144 downloader broken in precommit check | Blocker | build |
| [HBASE-19020](https://issues.apache.org/jira/browse/HBASE-19020) | TestXmlParsing exception checking relies on a particular xml implementation without declaring it. | Major | dependencies, REST |
| [HBASE-19038](https://issues.apache.org/jira/browse/HBASE-19038) | precommit mvn install should run from root on patch | Major | build |
| [HBASE-19032](https://issues.apache.org/jira/browse/HBASE-19032) | Set Content-Type header for patches uploaded by submit-patch.py | Major | . |
| [HBASE-18350](https://issues.apache.org/jira/browse/HBASE-18350) | RSGroups are broken under AMv2 | Blocker | rsgroup |
| [HBASE-18990](https://issues.apache.org/jira/browse/HBASE-18990) | ServerLoad doesn't override #equals which leads to #equals in ClusterStatus always false | Trivial | . |
| [HBASE-19017](https://issues.apache.org/jira/browse/HBASE-19017) | [AMv2] EnableTableProcedure is not retaining the assignments | Major | Region Assignment |
| [HBASE-19016](https://issues.apache.org/jira/browse/HBASE-19016) | Coordinate storage policy property name for table schema and bulkload | Minor | . |
| [HBASE-18997](https://issues.apache.org/jira/browse/HBASE-18997) | Remove the redundant methods in RegionInfo | Major | . |
| [HBASE-18355](https://issues.apache.org/jira/browse/HBASE-18355) | Enable export snapshot tests that were disabled by Proc-V2 AM in HBASE-14614 | Major | test |
| [HBASE-18505](https://issues.apache.org/jira/browse/HBASE-18505) | Our build/yetus personality will run tests on individual modules and then on all (i.e. 'root'). Should do one or other | Critical | build |
| [HBASE-18998](https://issues.apache.org/jira/browse/HBASE-18998) | processor.getRowsToLock() always assumes there is some row being locked | Major | . |
| [HBASE-18992](https://issues.apache.org/jira/browse/HBASE-18992) | Comparators passed to the Memstore's flattened segments seems to be wrong | Major | . |
| [HBASE-17590](https://issues.apache.org/jira/browse/HBASE-17590) | Drop cache hint should work for StoreFile write path | Major | . |
| [HBASE-18975](https://issues.apache.org/jira/browse/HBASE-18975) | Fix backup / restore hadoop3 incompatibility | Blocker | . |
| [HBASE-18904](https://issues.apache.org/jira/browse/HBASE-18904) | Missing break in NEXT\_ROW case of FilterList#mergeReturnCodeForOrOperator() | Minor | . |
| [HBASE-18934](https://issues.apache.org/jira/browse/HBASE-18934) | precommit on branch-1 isn't supposed to run against hadoop 3 | Critical | test |
| [HBASE-18973](https://issues.apache.org/jira/browse/HBASE-18973) | clean up maven warnings about pom well-formedness for master/branch-2 | Minor | build |
| [HBASE-18958](https://issues.apache.org/jira/browse/HBASE-18958) | Remove the IS annotation from SpaceLimitingException | Trivial | . |
| [HBASE-18921](https://issues.apache.org/jira/browse/HBASE-18921) | Result.current() throws ArrayIndexOutOfBoundsException after calling advance() | Minor | . |
| [HBASE-18940](https://issues.apache.org/jira/browse/HBASE-18940) | branch-2 (and probably others) fail check of generated source artifact | Critical | build |
| [HBASE-18874](https://issues.apache.org/jira/browse/HBASE-18874) | HMaster abort message will be skipped if Throwable is passed null | Minor | . |
| [HBASE-18941](https://issues.apache.org/jira/browse/HBASE-18941) | Confusing logging error around rerun of restore on an existing table. | Minor | . |
| [HBASE-18932](https://issues.apache.org/jira/browse/HBASE-18932) | Backups masking exception in a scenario and though it fails , it shows success message. | Major | . |
| [HBASE-18606](https://issues.apache.org/jira/browse/HBASE-18606) | Tests in hbase-spark module fail with UnsatisfiedLinkError | Critical | spark, test |
| [HBASE-18928](https://issues.apache.org/jira/browse/HBASE-18928) | Backup delete command shows wrong number of deletes requested | Minor | . |
| [HBASE-18490](https://issues.apache.org/jira/browse/HBASE-18490) | Modifying a table descriptor to enable replicas does not create replica regions | Major | Region Assignment |
| [HBASE-18913](https://issues.apache.org/jira/browse/HBASE-18913) | TestShell fails because NoMethodError: undefined method parseColumn | Major | shell |
| [HBASE-18894](https://issues.apache.org/jira/browse/HBASE-18894) | null pointer exception in list\_regions in shell command | Major | . |
| [HBASE-17441](https://issues.apache.org/jira/browse/HBASE-17441) | precommit test "hadoopcheck" not properly testing Hadoop 3 profile | Blocker | build |
| [HBASE-18845](https://issues.apache.org/jira/browse/HBASE-18845) | TestReplicationSmallTests fails after HBASE-14004 | Major | Replication |
| [HBASE-18887](https://issues.apache.org/jira/browse/HBASE-18887) | After full backup passed on hdfs root and incremental failed, full backup cannot be cleaned | Major | . |
| [HBASE-18888](https://issues.apache.org/jira/browse/HBASE-18888) | StealJobQueue should call super() to init the PriorityBlockingQueue | Major | . |
| [HBASE-18885](https://issues.apache.org/jira/browse/HBASE-18885) | HFileOutputFormat2 hardcodes default FileOutputCommitter | Major | mapreduce |
| [HBASE-18880](https://issues.apache.org/jira/browse/HBASE-18880) | Failed to start rest server if the value of hbase.rest.threads.max is too small. | Critical | REST |
| [HBASE-18762](https://issues.apache.org/jira/browse/HBASE-18762) | Canary sink type cast error | Major | . |
| [HBASE-18830](https://issues.apache.org/jira/browse/HBASE-18830) | TestCanaryTool does not check Canary monitor's error code | Major | . |
| [HBASE-18876](https://issues.apache.org/jira/browse/HBASE-18876) | Backup create command fails to take queue parameter as option | Major | . |
| [HBASE-18796](https://issues.apache.org/jira/browse/HBASE-18796) | Admin#isTableAvailable returns incorrect result before daughter regions are opened | Major | . |
| [HBASE-18866](https://issues.apache.org/jira/browse/HBASE-18866) | clean up warnings about proto syntax | Minor | Protobufs |
| [HBASE-18787](https://issues.apache.org/jira/browse/HBASE-18787) | Fix the "dependencies connecting to an HBase cluster" | Minor | documentation |
| [HBASE-18853](https://issues.apache.org/jira/browse/HBASE-18853) | hbase-protocol-shaded includes protobuf (since we moved to hbase-thirdparty) | Major | thirdparty |
| [HBASE-18852](https://issues.apache.org/jira/browse/HBASE-18852) | Take down the hbasecon asia banner on home page | Major | website |
| [HBASE-18851](https://issues.apache.org/jira/browse/HBASE-18851) | LICENSE failure after HADOOP-14799 with Hadoop 3 | Critical | build |
| [HBASE-18832](https://issues.apache.org/jira/browse/HBASE-18832) | LTT fails with casting exception for HColumnDescriptor | Major | . |
| [HBASE-18803](https://issues.apache.org/jira/browse/HBASE-18803) | Mapreduce job get failed caused by NoClassDefFoundError: org/apache/commons/lang3/ArrayUtils | Major | . |
| [HBASE-18808](https://issues.apache.org/jira/browse/HBASE-18808) | Ineffective config check in BackupLogCleaner#getDeletableFiles() | Major | . |
| [HBASE-18836](https://issues.apache.org/jira/browse/HBASE-18836) | Note need for explicit javax.el and exclude from shaded artifacts | Blocker | Client |
| [HBASE-18834](https://issues.apache.org/jira/browse/HBASE-18834) | fix shellcheck warning on hbase personality | Minor | test |
| [HBASE-18831](https://issues.apache.org/jira/browse/HBASE-18831) | Add explicit dependency on javax.el | Major | dependencies |
| [HBASE-18641](https://issues.apache.org/jira/browse/HBASE-18641) | Include block content verification logic used in lruCache in bucketCache | Minor | regionserver |
| [HBASE-14004](https://issues.apache.org/jira/browse/HBASE-14004) | [Replication] Inconsistency between Memstore and WAL may result in data in remote cluster that is not in the origin | Critical | regionserver, Replication |
| [HBASE-18801](https://issues.apache.org/jira/browse/HBASE-18801) | Bulk load cleanup may falsely deem file deletion successful | Major | . |
| [HBASE-18813](https://issues.apache.org/jira/browse/HBASE-18813) | TestCanaryTool fails on branch-1 / branch-1.4 | Major | . |
| [HBASE-18818](https://issues.apache.org/jira/browse/HBASE-18818) | TestConnectionImplemenation fails | Major | test |
| [HBASE-16611](https://issues.apache.org/jira/browse/HBASE-16611) | Flakey org.apache.hadoop.hbase.client.TestReplicasClient.testCancelOfMultiGet | Major | . |
| [HBASE-18723](https://issues.apache.org/jira/browse/HBASE-18723) | [pom cleanup] Do a pass with dependency:analyze; remove unused and explicity list the dependencies we exploit | Major | pom |
| [HBASE-18789](https://issues.apache.org/jira/browse/HBASE-18789) | Displays the reporting interval of each RS on the Master page | Major | . |
| [HBASE-18771](https://issues.apache.org/jira/browse/HBASE-18771) | Incorrect StoreFileRefresh leading to split and compaction failures | Blocker | . |
| [HBASE-18791](https://issues.apache.org/jira/browse/HBASE-18791) | HBASE\_HOME/lib does not contain hbase-mapreduce-${project.version}-tests.jar | Major | . |
| [HBASE-17853](https://issues.apache.org/jira/browse/HBASE-17853) | Link to "Why does HBase care about /etc/hosts?" does not work | Trivial | documentation |
| [HBASE-18759](https://issues.apache.org/jira/browse/HBASE-18759) | Fix hbase-shaded-check-invariants failure | Blocker | Client, mapreduce |
| [HBASE-18765](https://issues.apache.org/jira/browse/HBASE-18765) | The value of balancerRan is true even though no plans are executed | Minor | rsgroup |
| [HBASE-18543](https://issues.apache.org/jira/browse/HBASE-18543) | Re-enable test master.TestMasterFailover on master | Major | amv2 |
| [HBASE-17713](https://issues.apache.org/jira/browse/HBASE-17713) | the interface '/version/cluster' with header 'Accept: application/json' return is not JSON but plain text | Minor | REST |
| [HBASE-18757](https://issues.apache.org/jira/browse/HBASE-18757) | Fix Improper bitwise & in BucketCache offset calculation | Major | BucketCache |
| [HBASE-18743](https://issues.apache.org/jira/browse/HBASE-18743) | HFiles in use by a table which has the same name and namespace with a default table cloned from snapshot may be deleted when that snapshot and default table are deleted | Critical | hbase |
| [HBASE-15497](https://issues.apache.org/jira/browse/HBASE-15497) | Incorrect javadoc for atomicity guarantee of Increment and Append | Minor | documentation |
| [HBASE-16390](https://issues.apache.org/jira/browse/HBASE-16390) | Fix documentation around setAutoFlush | Minor | documentation |
| [HBASE-18741](https://issues.apache.org/jira/browse/HBASE-18741) | Remove cancel command from backup code | Major | . |
| [HBASE-18461](https://issues.apache.org/jira/browse/HBASE-18461) | Build broken If the username contains a backslash | Minor | . |
| [HBASE-18306](https://issues.apache.org/jira/browse/HBASE-18306) | Get rid of TableDescriptor#getConfiguration | Critical | . |
| [HBASE-15947](https://issues.apache.org/jira/browse/HBASE-15947) | Classes used only for tests included in main code base | Trivial | build, test |
| [HBASE-18714](https://issues.apache.org/jira/browse/HBASE-18714) | The dropBehind and readahead don't be applied when useHBaseChecksum is enabled | Minor | . |
| [HBASE-14745](https://issues.apache.org/jira/browse/HBASE-14745) | Shade the last few dependencies in hbase-shaded-client | Blocker | Client, dependencies |
| [HBASE-18665](https://issues.apache.org/jira/browse/HBASE-18665) | ReversedScannerCallable invokes getRegionLocations incorrectly | Critical | . |
| [HBASE-18568](https://issues.apache.org/jira/browse/HBASE-18568) | Correct metric of numRegions | Critical | metrics |
| [HBASE-18369](https://issues.apache.org/jira/browse/HBASE-18369) | hbase thrift web-ui not available | Major | Thrift |
| [HBASE-18640](https://issues.apache.org/jira/browse/HBASE-18640) | Move mapreduce out of hbase-server into separate hbase-mapreduce module | Major | . |
| [HBASE-18633](https://issues.apache.org/jira/browse/HBASE-18633) | Add more info to understand the source/scenario of large batch requests exceeding threshold | Major | . |
| [HBASE-18635](https://issues.apache.org/jira/browse/HBASE-18635) | Fix asciidoc warnings | Major | . |
| [HBASE-18671](https://issues.apache.org/jira/browse/HBASE-18671) | Support Append/Increment in rest api | Major | REST |
| [HBASE-16722](https://issues.apache.org/jira/browse/HBASE-16722) | Document: Broken link in CatalogJanitor | Trivial | documentation |
| [HBASE-18679](https://issues.apache.org/jira/browse/HBASE-18679) | YARN may null Counters object and cause an NPE in ITBLL | Trivial | integration tests |
| [HBASE-18607](https://issues.apache.org/jira/browse/HBASE-18607) | fix submit-patch.py to support utf8 | Trivial | . |
| [HBASE-18287](https://issues.apache.org/jira/browse/HBASE-18287) | Remove log warning in PartitionedMobCompactor.java#getFileStatus | Minor | mob |
| [HBASE-18647](https://issues.apache.org/jira/browse/HBASE-18647) | Parameter cacheBlocks does not take effect in REST API for scan | Major | REST |
| [HBASE-18628](https://issues.apache.org/jira/browse/HBASE-18628) | ZKPermissionWatcher blocks all ZK notifications | Critical | regionserver |
| [HBASE-18614](https://issues.apache.org/jira/browse/HBASE-18614) | Setting BUCKET\_CACHE\_COMBINED\_KEY to false disables stats on RS UI | Major | regionserver |
| [HBASE-18575](https://issues.apache.org/jira/browse/HBASE-18575) | [AMv2] Enable and fix TestRestartCluster#testRetainAssignmentOnRestart on master | Critical | amv2 |
| [HBASE-18655](https://issues.apache.org/jira/browse/HBASE-18655) | TestAsyncClusterAdminApi2 failing sometimes | Major | . |
| [HBASE-18615](https://issues.apache.org/jira/browse/HBASE-18615) | hbase-rest tests fail in hbase-2.0.0-alpha2 | Blocker | test |
| [HBASE-18644](https://issues.apache.org/jira/browse/HBASE-18644) | Duplicate "compactionQueueLength" metric in Region Server metrics | Minor | metrics |
| [HBASE-16615](https://issues.apache.org/jira/browse/HBASE-16615) | Fix flaky TestScannerHeartbeatMessages | Major | Client, Scanners |
| [HBASE-18627](https://issues.apache.org/jira/browse/HBASE-18627) | Fix TestRegionServerReadRequestMetrics | Major | test |
| [HBASE-18634](https://issues.apache.org/jira/browse/HBASE-18634) | Fix client.TestClientClusterStatus | Major | test |
| [HBASE-18637](https://issues.apache.org/jira/browse/HBASE-18637) | Update the link of "Bending time in HBase" | Trivial | documentation |
| [HBASE-18471](https://issues.apache.org/jira/browse/HBASE-18471) | The DeleteFamily cell is skipped when StoreScanner seeks to next column | Critical | Deletes, hbase, scan |
| [HBASE-18572](https://issues.apache.org/jira/browse/HBASE-18572) | Delete can't remove the cells which have no visibility label | Critical | . |
| [HBASE-18617](https://issues.apache.org/jira/browse/HBASE-18617) | FuzzyRowKeyFilter should not modify the filter pairs | Minor | . |
| [HBASE-18125](https://issues.apache.org/jira/browse/HBASE-18125) | HBase shell disregards spaces at the end of a split key in a split file | Major | shell |
| [HBASE-18587](https://issues.apache.org/jira/browse/HBASE-18587) | Fix Flaky TestFileIOEngine | Major | BucketCache, test |
| [HBASE-18431](https://issues.apache.org/jira/browse/HBASE-18431) | Mitigate compatibility concerns between branch-1.3 and branch-1.4 | Blocker | . |
| [HBASE-18493](https://issues.apache.org/jira/browse/HBASE-18493) | [AMv2] On region server crash do not process system table regions through AssignmentManager.checkIfShouldMoveSystemRegionAsync() | Critical | amv2 |
| [HBASE-18598](https://issues.apache.org/jira/browse/HBASE-18598) | AsyncNonMetaRegionLocator use FIFO algorithm to get a candidate locate request | Minor | asyncclient |
| [HBASE-18437](https://issues.apache.org/jira/browse/HBASE-18437) | Revoke access permissions of a user from a table does not work as expected | Major | security |
| [HBASE-18526](https://issues.apache.org/jira/browse/HBASE-18526) | FIFOCompactionPolicy pre-check uses wrong scope | Major | master |
| [HBASE-18599](https://issues.apache.org/jira/browse/HBASE-18599) | Add missing @Deprecated annotations | Minor | . |
| [HBASE-17803](https://issues.apache.org/jira/browse/HBASE-17803) | PE always re-creates table when we specify the split policy | Minor | . |
| [HBASE-18592](https://issues.apache.org/jira/browse/HBASE-18592) | [hbase-thirdparty] Doc on new hbase-thirdparty dependency for the refguide | Major | documentation |
| [HBASE-18557](https://issues.apache.org/jira/browse/HBASE-18557) | change splitable to mergeable in MergeTableRegionsProcedure | Major | . |
| [HBASE-18025](https://issues.apache.org/jira/browse/HBASE-18025) | CatalogJanitor should collect outdated RegionStates from the AM | Major | read replicas |
| [HBASE-18551](https://issues.apache.org/jira/browse/HBASE-18551) | [AMv2] UnassignProcedure and crashed regionservers | Major | amv2 |
| [HBASE-18390](https://issues.apache.org/jira/browse/HBASE-18390) | Sleep too long when finding region location failed | Major | Client |
| [HBASE-18563](https://issues.apache.org/jira/browse/HBASE-18563) | Fix RAT License complaint about website jenkins scripts | Trivial | . |
| [HBASE-18024](https://issues.apache.org/jira/browse/HBASE-18024) | HRegion#initializeRegionInternals should not re-create .hregioninfo file when the region directory no longer exists | Major | Region Assignment, regionserver |
| [HBASE-18560](https://issues.apache.org/jira/browse/HBASE-18560) | Test master.assignment.TestAssignmentManager hangs on master and its in flaky list | Major | . |
| [HBASE-18262](https://issues.apache.org/jira/browse/HBASE-18262) | name of parameter quote need update in hbase-default.xml | Minor | . |
| [HBASE-18525](https://issues.apache.org/jira/browse/HBASE-18525) | TestAssignmentManager#testSocketTimeout fails in master branch | Major | . |
| [HBASE-18492](https://issues.apache.org/jira/browse/HBASE-18492) | [AMv2] Embed code for selecting highest versioned region server for system table regions in AssignmentManager.processAssignQueue() | Major | amv2 |
| [HBASE-18516](https://issues.apache.org/jira/browse/HBASE-18516) | [AMv2] Remove dead code in ServerManager resulted mostly from AMv2 refactoring | Major | . |
| [HBASE-18470](https://issues.apache.org/jira/browse/HBASE-18470) | Remove the redundant comma from RetriesExhaustedWithDetailsException#getDesc | Minor | Client |
| [HBASE-17056](https://issues.apache.org/jira/browse/HBASE-17056) | Remove checked in PB generated files | Critical | . |
| [HBASE-18480](https://issues.apache.org/jira/browse/HBASE-18480) | The cost of BaseLoadBalancer.cluster is changed even if the rollback is done | Major | Balancer |
| [HBASE-18491](https://issues.apache.org/jira/browse/HBASE-18491) | [AMv2] Fail UnassignProcedure if source Region Server is not online. | Critical | amv2 |
| [HBASE-18487](https://issues.apache.org/jira/browse/HBASE-18487) | Minor fixes in row lock implementation | Major | . |
| [HBASE-18475](https://issues.apache.org/jira/browse/HBASE-18475) | MasterProcedureScheduler incorrectly passes null Procedure to table locking | Major | proc-v2 |
| [HBASE-18259](https://issues.apache.org/jira/browse/HBASE-18259) | HBase book link to "beginner" issues includes resolved issues | Major | documentation |
| [HBASE-18481](https://issues.apache.org/jira/browse/HBASE-18481) | The autoFlush flag was not used in PE tool | Minor | . |
| [HBASE-18406](https://issues.apache.org/jira/browse/HBASE-18406) | In ServerCrashProcedure.java start(MasterProcedureEnv) is a no-op | Major | . |
| [HBASE-18473](https://issues.apache.org/jira/browse/HBASE-18473) | VC.listLabels() erroneously closes any connection | Major | Client |
| [HBASE-17131](https://issues.apache.org/jira/browse/HBASE-17131) | Avoid livelock caused by HRegion#processRowsWithLocks | Major | regionserver |
| [HBASE-18185](https://issues.apache.org/jira/browse/HBASE-18185) | IntegrationTestTimeBoundedRequestsWithRegionReplicas unbalanced tests fails with AssertionError | Minor | integration tests |
| [HBASE-18362](https://issues.apache.org/jira/browse/HBASE-18362) | hbck should not report split replica parent region from meta as errors | Minor | hbck |
| [HBASE-17839](https://issues.apache.org/jira/browse/HBASE-17839) | "Data Model" section: Table 1 has only 5 data rows instead 6. | Trivial | documentation |
| [HBASE-18445](https://issues.apache.org/jira/browse/HBASE-18445) | Upgrading Guava broke hadoop-3.0 profile | Blocker | build, dependencies, hadoop3 |
| [HBASE-18449](https://issues.apache.org/jira/browse/HBASE-18449) | Fix client.locking.TestEntityLocks#testHeartbeatException | Minor | test |
| [HBASE-18447](https://issues.apache.org/jira/browse/HBASE-18447) | MetricRegistryInfo#hashCode uses hashCode instead of toHashCode | Minor | . |
| [HBASE-18441](https://issues.apache.org/jira/browse/HBASE-18441) | ZookeeperWatcher#interruptedException should throw exception | Major | . |
| [HBASE-18054](https://issues.apache.org/jira/browse/HBASE-18054) | log when we add/remove failed servers in client | Major | Client, Operability |
| [HBASE-18427](https://issues.apache.org/jira/browse/HBASE-18427) | minor cleanup around AssignmentManager | Minor | amv2 |
| [HBASE-18323](https://issues.apache.org/jira/browse/HBASE-18323) | Remove multiple ACLs for the same user in kerberos | Minor | . |
| [HBASE-18354](https://issues.apache.org/jira/browse/HBASE-18354) | Fix TestMasterMetrics that were disabled by Proc-V2 AM in HBASE-14614 | Major | test |
| [HBASE-18433](https://issues.apache.org/jira/browse/HBASE-18433) | Convenience method for creating simple ColumnFamilyDescriptor | Major | Client |
| [HBASE-18430](https://issues.apache.org/jira/browse/HBASE-18430) | Typo in "contributing to documentation" page | Major | documentation |
| [HBASE-18404](https://issues.apache.org/jira/browse/HBASE-18404) | Small typo on ACID documentation page | Trivial | documentation |
| [HBASE-16993](https://issues.apache.org/jira/browse/HBASE-16993) | BucketCache throw java.io.IOException: Invalid HFile block magic when configuring hbase.bucketcache.bucket.sizes | Major | BucketCache |
| [HBASE-18337](https://issues.apache.org/jira/browse/HBASE-18337) | hbase-shaded-server brings in signed jars | Major | shading |
| [HBASE-18330](https://issues.apache.org/jira/browse/HBASE-18330) | NPE in ReplicationZKLockCleanerChore | Major | master, Replication |
| [HBASE-18393](https://issues.apache.org/jira/browse/HBASE-18393) | hbase shell non-interactive broken | Blocker | scripts, shell |
| [HBASE-17648](https://issues.apache.org/jira/browse/HBASE-17648) | HBase Table-level synchronization fails between two secured(kerberized) clusters | Critical | mapreduce, Operability, security, tooling |
| [HBASE-16090](https://issues.apache.org/jira/browse/HBASE-16090) | ResultScanner is not closed in SyncTable#finishRemainingHashRanges() | Major | mapreduce, Operability, tooling |
| [HBASE-15548](https://issues.apache.org/jira/browse/HBASE-15548) | SyncTable: sourceHashDir is supposed to be optional but won't work without | Critical | mapreduce, Operability, tooling |
| [HBASE-18377](https://issues.apache.org/jira/browse/HBASE-18377) | Error handling for FileNotFoundException should consider RemoteException in openReader() | Major | . |
| [HBASE-18260](https://issues.apache.org/jira/browse/HBASE-18260) | Address new license dependencies from hadoop3-alpha4 | Major | dependencies |
| [HBASE-18177](https://issues.apache.org/jira/browse/HBASE-18177) | FanOutOneBlockAsyncDFSOutputHelper fails to compile against Hadoop 3 | Major | wal |
| [HBASE-18358](https://issues.apache.org/jira/browse/HBASE-18358) | Backport HBASE-18099 'FlushSnapshotSubprocedure should wait for concurrent Region#flush() to finish' to branch-1.3 | Critical | snapshots |
| [HBASE-18348](https://issues.apache.org/jira/browse/HBASE-18348) | The implementation of AsyncTableRegionLocator does not follow the javadoc | Critical | asyncclient, Client |
| [HBASE-18292](https://issues.apache.org/jira/browse/HBASE-18292) | Fix flaky test hbase.master.locking.TestLockProcedure#testLocalMasterLockRecovery() | Major | . |
| [HBASE-17705](https://issues.apache.org/jira/browse/HBASE-17705) | Procedure execution must fail fast if procedure is not registered | Blocker | . |
| [HBASE-18341](https://issues.apache.org/jira/browse/HBASE-18341) | Update findHangingTests.py script to match changed consoleText of trunk build | Major | . |
| [HBASE-18335](https://issues.apache.org/jira/browse/HBASE-18335) | clean up configuration guide | Major | documentation |
| [HBASE-18329](https://issues.apache.org/jira/browse/HBASE-18329) | update links in config guide to point to java 8 references | Major | documentation |
| [HBASE-18312](https://issues.apache.org/jira/browse/HBASE-18312) | Ineffective handling of FileNotFoundException in FileLink$FileLinkInputStream.tryOpen() | Major | . |
| [HBASE-17931](https://issues.apache.org/jira/browse/HBASE-17931) | Assign system tables to servers with highest version | Blocker | Region Assignment, scan |
| [HBASE-18325](https://issues.apache.org/jira/browse/HBASE-18325) | Disable flakey TestMasterProcedureWalLease | Major | test |
| [HBASE-16120](https://issues.apache.org/jira/browse/HBASE-16120) | Add shell test for truncate\_preserve | Minor | . |
| [HBASE-18301](https://issues.apache.org/jira/browse/HBASE-18301) | Enable TestSimpleRegionNormalizerOnCluster#testRegionNormalizationMergeOnCluster that was disabled by Proc-V2 AM in HBASE-14614 | Major | test |
| [HBASE-18310](https://issues.apache.org/jira/browse/HBASE-18310) | LoadTestTool unable to write data | Major | util |
| [HBASE-18320](https://issues.apache.org/jira/browse/HBASE-18320) | Address maven-site-plugin upgrade steps | Blocker | website |
| [HBASE-18311](https://issues.apache.org/jira/browse/HBASE-18311) | clean up the quickstart guide | Major | documentation |
| [HBASE-13866](https://issues.apache.org/jira/browse/HBASE-13866) | Add endpoint coprocessor to the section hbase.coprocessor.region.classes in HBase book | Trivial | documentation |
| [HBASE-18302](https://issues.apache.org/jira/browse/HBASE-18302) | Protobuf section in the docs needs some clean up | Blocker | documentation |
| [HBASE-16192](https://issues.apache.org/jira/browse/HBASE-16192) | Fix the potential problems in TestAcidGuarantees | Major | . |
| [HBASE-17982](https://issues.apache.org/jira/browse/HBASE-17982) | Is the word "occured" should be "occurred ? | Trivial | hbase |
| [HBASE-18290](https://issues.apache.org/jira/browse/HBASE-18290) | Fix TestAddColumnFamilyProcedure and TestDeleteTableProcedure | Major | test |
| [HBASE-18278](https://issues.apache.org/jira/browse/HBASE-18278) | [AMv2] Enable and fix uni test hbase.master.procedure.TestServerCrashProcedure#testRecoveryAndDoubleExecutionOnRsWithMeta | Major | . |
| [HBASE-18244](https://issues.apache.org/jira/browse/HBASE-18244) | org.apache.hadoop.hbase.client.rsgroup.TestShellRSGroups hangs/fails | Major | test |
| [HBASE-18230](https://issues.apache.org/jira/browse/HBASE-18230) | Generated LICENSE file includes unsubstituted Velocity variables | Major | build |
| [HBASE-18274](https://issues.apache.org/jira/browse/HBASE-18274) | hbase autorestart will overwrite the gc log | Major | hbase |
| [HBASE-18265](https://issues.apache.org/jira/browse/HBASE-18265) | Correct the link unuseful in regionServer's region state UI | Trivial | UI |
| [HBASE-18263](https://issues.apache.org/jira/browse/HBASE-18263) | Resolve NPE in backup Master UI when access to procedures.jsp | Trivial | UI |
| [HBASE-18254](https://issues.apache.org/jira/browse/HBASE-18254) | ServerCrashProcedure checks and waits for meta initialized, instead should check and wait for meta loaded | Major | amv2 |
| [HBASE-18235](https://issues.apache.org/jira/browse/HBASE-18235) | LoadBalancer.BOGUS\_SERVER\_NAME should not have a bogus hostname | Major | . |
| [HBASE-18212](https://issues.apache.org/jira/browse/HBASE-18212) | In Standalone mode with local filesystem HBase logs Warning message:Failed to invoke 'unbuffer' method in class class org.apache.hadoop.fs.FSDataInputStream | Minor | Operability |
| [HBASE-17988](https://issues.apache.org/jira/browse/HBASE-17988) | get-active-master.rb and draining\_servers.rb no longer work | Critical | scripts |
| [HBASE-18180](https://issues.apache.org/jira/browse/HBASE-18180) | Possible connection leak while closing BufferedMutator in TableOutputFormat | Major | mapreduce |
| [HBASE-18227](https://issues.apache.org/jira/browse/HBASE-18227) | [AMv2] Fix test hbase.coprocessor.TestCoprocessorMetrics#testRegionObserverAfterRegionClosed | Major | amv2 |
| [HBASE-18225](https://issues.apache.org/jira/browse/HBASE-18225) | Fix findbugs regression calling toString() on an array | Trivial | . |
| [HBASE-18166](https://issues.apache.org/jira/browse/HBASE-18166) | [AMv2] We are splitting already-split files | Major | Region Assignment |
| [HBASE-18209](https://issues.apache.org/jira/browse/HBASE-18209) | Include httpclient / httpcore jars in build artifacts | Major | . |
| [HBASE-18219](https://issues.apache.org/jira/browse/HBASE-18219) | Fix typo in constant HConstants.HBASE\_CLIENT\_MEAT\_REPLICA\_SCAN\_TIMEOUT | Minor | . |
| [HBASE-18200](https://issues.apache.org/jira/browse/HBASE-18200) | Set hadoop check versions for branch-2 and branch-2.x in pre commit | Major | build |
| [HBASE-18207](https://issues.apache.org/jira/browse/HBASE-18207) | branch-2 build fails in the checkstyle phase | Major | . |
| [HBASE-18137](https://issues.apache.org/jira/browse/HBASE-18137) | Replication gets stuck for empty WALs | Critical | Replication |
| [HBASE-18199](https://issues.apache.org/jira/browse/HBASE-18199) | Race in NettyRpcConnection may cause call stuck in BufferCallBeforeInitHandler forever | Major | IPC/RPC |
| [HBASE-18192](https://issues.apache.org/jira/browse/HBASE-18192) | Replication drops recovered queues on region server shutdown | Blocker | Replication |
| [HBASE-18092](https://issues.apache.org/jira/browse/HBASE-18092) | Removing a peer does not properly clean up the ReplicationSourceManager state and metrics | Major | Replication |
| [HBASE-18193](https://issues.apache.org/jira/browse/HBASE-18193) | Master web UI presents the incorrect number of regions | Minor | . |
| [HBASE-18195](https://issues.apache.org/jira/browse/HBASE-18195) | Remove redundant single quote from start message for HMaster and HRegionServer | Minor | master, regionserver |
| [HBASE-18141](https://issues.apache.org/jira/browse/HBASE-18141) | Regionserver fails to shutdown when abort triggered in RegionScannerImpl during RPC call | Critical | regionserver, security |
| [HBASE-15302](https://issues.apache.org/jira/browse/HBASE-15302) | Reenable the other tests disabled by HBASE-14678 | Major | test |
| [HBASE-18184](https://issues.apache.org/jira/browse/HBASE-18184) | Add hbase-hadoop2-compat jar as MapReduce job dependency | Minor | mapreduce |
| [HBASE-18149](https://issues.apache.org/jira/browse/HBASE-18149) | The setting rules for table-scope attributes and family-scope attributes should keep consistent | Major | shell |
| [HBASE-18158](https://issues.apache.org/jira/browse/HBASE-18158) | Two running in-memory compaction threads may lose data | Major | . |
| [HBASE-18145](https://issues.apache.org/jira/browse/HBASE-18145) | The flush may cause the corrupt data for reading | Blocker | . |
| [HBASE-18132](https://issues.apache.org/jira/browse/HBASE-18132) | Low replication should be checked in period in case of datanode rolling upgrade | Major | . |
| [HBASE-9393](https://issues.apache.org/jira/browse/HBASE-9393) | Hbase does not closing a closed socket resulting in many CLOSE\_WAIT | Critical | . |
| [HBASE-18005](https://issues.apache.org/jira/browse/HBASE-18005) | read replica: handle the case that region server hosting both primary replica and meta region is down | Major | . |
| [HBASE-18030](https://issues.apache.org/jira/browse/HBASE-18030) | Per Cell TTL tags may get duplicated with increments/Append causing tags length overflow | Critical | hbase, regionserver |
| [HBASE-18155](https://issues.apache.org/jira/browse/HBASE-18155) | TestMasterProcedureWalLease is flakey | Major | amv2 |
| [HBASE-18111](https://issues.apache.org/jira/browse/HBASE-18111) | Replication stuck when cluster connection is closed | Major | . |
| [HBASE-18143](https://issues.apache.org/jira/browse/HBASE-18143) | [AMv2] Backoff on failed report of region transition quickly goes to astronomical time scale | Critical | Region Assignment |
| [HBASE-18129](https://issues.apache.org/jira/browse/HBASE-18129) | truncate\_preserve fails when the truncate method doesn't exists on the master | Major | shell |
| [HBASE-18122](https://issues.apache.org/jira/browse/HBASE-18122) | Scanner id should include ServerName of region server | Major | . |
| [HBASE-18027](https://issues.apache.org/jira/browse/HBASE-18027) | Replication should respect RPC size limits when batching edits | Major | Replication |
| [HBASE-18042](https://issues.apache.org/jira/browse/HBASE-18042) | Client Compatibility breaks between versions 1.2 and 1.3 | Critical | regionserver, scan |
| [HBASE-18118](https://issues.apache.org/jira/browse/HBASE-18118) | Default storage policy if not configured cannot be "NONE" | Minor | wal |
| [HBASE-16011](https://issues.apache.org/jira/browse/HBASE-16011) | TableSnapshotScanner and TableSnapshotInputFormat can produce duplicate rows | Major | snapshots |
| [HBASE-18120](https://issues.apache.org/jira/browse/HBASE-18120) | Fix TestAsyncRegionAdminApi | Major | test |
| [HBASE-18113](https://issues.apache.org/jira/browse/HBASE-18113) | Handle old client without include\_stop\_row flag when startRow equals endRow | Major | . |
| [HBASE-17997](https://issues.apache.org/jira/browse/HBASE-17997) | In dev environment, add jruby-complete jar to classpath only when jruby is needed | Major | . |
| [HBASE-18099](https://issues.apache.org/jira/browse/HBASE-18099) | FlushSnapshotSubprocedure should wait for concurrent Region#flush() to finish | Critical | snapshots |
| [HBASE-18084](https://issues.apache.org/jira/browse/HBASE-18084) | Improve CleanerChore to clean from directory which consumes more disk space | Major | . |
| [HBASE-18085](https://issues.apache.org/jira/browse/HBASE-18085) | Prevent parallel purge in ObjectPool | Major | . |
| [HBASE-18093](https://issues.apache.org/jira/browse/HBASE-18093) | Overloading the meaning of 'enabled' in Quota Manager to indicate either quota disabled or quota manager not ready is not good | Minor | master |
| [HBASE-18077](https://issues.apache.org/jira/browse/HBASE-18077) | Update JUnit license to EPL from CPL | Blocker | build, community |
| [HBASE-18069](https://issues.apache.org/jira/browse/HBASE-18069) | Fix flaky test TestReplicationAdminWithClusters#testDisableAndEnableReplication | Trivial | test |
| [HBASE-15616](https://issues.apache.org/jira/browse/HBASE-15616) | Allow null qualifier for all table operations | Major | Client |
| [HBASE-18081](https://issues.apache.org/jira/browse/HBASE-18081) | The way we process connection preamble in SimpleRpcServer is broken | Major | IPC/RPC |
| [HBASE-18035](https://issues.apache.org/jira/browse/HBASE-18035) | Meta replica does not give any primaryOperationTimeout to primary meta region | Critical | . |
| [HBASE-18071](https://issues.apache.org/jira/browse/HBASE-18071) | Fix flaky test TestStochasticLoadBalancer#testBalanceCluster | Major | Balancer |
| [HBASE-18058](https://issues.apache.org/jira/browse/HBASE-18058) | Zookeeper retry sleep time should have an upper limit | Major | . |
| [HBASE-17286](https://issues.apache.org/jira/browse/HBASE-17286) | LICENSE.txt in binary tarball contains only ASL text | Blocker | build, community |
| [HBASE-18049](https://issues.apache.org/jira/browse/HBASE-18049) | It is not necessary to re-open the region when MOB files cannot be found | Major | Scanners |
| [HBASE-18053](https://issues.apache.org/jira/browse/HBASE-18053) | AsyncTableResultScanner will hang when scan wrong column family | Major | Client |
| [HBASE-18051](https://issues.apache.org/jira/browse/HBASE-18051) | balance\_rsgroup still run when the Load Balancer is not enabled. | Major | rsgroup |
| [HBASE-17352](https://issues.apache.org/jira/browse/HBASE-17352) | Fix hbase-assembly build with bash 4 | Minor | . |
| [HBASE-18055](https://issues.apache.org/jira/browse/HBASE-18055) | Releasing L2 cache HFileBlocks before shipped() when switching from pread to stream causes result corruption | Major | regionserver, Scanners |
| [HBASE-18000](https://issues.apache.org/jira/browse/HBASE-18000) | Make sure we always return the scanner id with ScanResponse | Major | regionserver |
| [HBASE-18026](https://issues.apache.org/jira/browse/HBASE-18026) | ProtobufUtil seems to do extra array copying | Minor | . |
| [HBASE-16356](https://issues.apache.org/jira/browse/HBASE-16356) | REST API scanner: row prefix filter and custom filter parameters are mutually exclusive | Minor | REST |
| [HBASE-8758](https://issues.apache.org/jira/browse/HBASE-8758) | Error in RegionCoprocessorHost class preScanner method documentation. | Minor | Coprocessors, documentation |
| [HBASE-17471](https://issues.apache.org/jira/browse/HBASE-17471) | Region Seqid will be out of order in WAL if using mvccPreAssign | Critical | wal |
| [HBASE-17964](https://issues.apache.org/jira/browse/HBASE-17964) | ensure hbase-metrics-api is included in mapreduce job classpaths | Blocker | mapreduce |
| [HBASE-17991](https://issues.apache.org/jira/browse/HBASE-17991) | Add more details about compaction queue on /dump | Minor | . |
| [HBASE-17228](https://issues.apache.org/jira/browse/HBASE-17228) | precommit grep -c ERROR may grab non errors | Minor | build, community, test |
| [HBASE-17958](https://issues.apache.org/jira/browse/HBASE-17958) | Avoid passing unexpected cell to ScanQueryMatcher when optimize SEEK to SKIP | Major | . |
| [HBASE-17985](https://issues.apache.org/jira/browse/HBASE-17985) | Inline package manage updates with package installation in Yetus Dockerfile | Blocker | . |
| [HBASE-17957](https://issues.apache.org/jira/browse/HBASE-17957) | Custom metrics of replicate endpoints don't prepend "source." to global metrics | Minor | Replication |
| [HBASE-17862](https://issues.apache.org/jira/browse/HBASE-17862) | Condition that always returns true | Trivial | Client |
| [HBASE-14286](https://issues.apache.org/jira/browse/HBASE-14286) | Correct typo in argument name for WALSplitter.writeRegionSequenceIdFile | Trivial | . |
| [HBASE-17879](https://issues.apache.org/jira/browse/HBASE-17879) | Avoid NPE in snapshot.jsp when accessing without any request parameter | Trivial | UI |
| [HBASE-17975](https://issues.apache.org/jira/browse/HBASE-17975) | TokenUtil.obtainToken squashes remote exceptions | Blocker | mapreduce, security |
| [HBASE-17970](https://issues.apache.org/jira/browse/HBASE-17970) | Set yarn.app.mapreduce.am.staging-dir when starting MiniMRCluster | Major | mapreduce, snapshots, test |
| [HBASE-17950](https://issues.apache.org/jira/browse/HBASE-17950) | Write the chunkId also as Int instead of long into the first byte of the chunk | Major | . |
| [HBASE-17904](https://issues.apache.org/jira/browse/HBASE-17904) | Get runs into NoSuchElementException when using Read Replica, with hbase. ipc.client.specificThreadForWriting to be true and hbase.rpc.client.impl to be org.apache.hadoop.hbase.ipc.RpcClientImpl | Major | Client, IPC/RPC |
| [HBASE-17947](https://issues.apache.org/jira/browse/HBASE-17947) | Location of Examples.proto is wrong in comment of RowCountEndPoint.java | Trivial | Coprocessors |
| [HBASE-17302](https://issues.apache.org/jira/browse/HBASE-17302) | The region flush request disappeared from flushQueue | Major | . |
| [HBASE-17943](https://issues.apache.org/jira/browse/HBASE-17943) | The in-memory flush size is different for each CompactingMemStore located in the same region | Major | regionserver |
| [HBASE-17946](https://issues.apache.org/jira/browse/HBASE-17946) | Shell command compact\_rs don't work | Major | shell |
| [HBASE-17941](https://issues.apache.org/jira/browse/HBASE-17941) | CellArrayMap#getCell may throw IndexOutOfBoundsException | Minor | . |
| [HBASE-13288](https://issues.apache.org/jira/browse/HBASE-13288) | Fix naming of parameter in Delete constructor | Trivial | API |
| [HBASE-17937](https://issues.apache.org/jira/browse/HBASE-17937) | Memstore size becomes negative in case of expensive postPut/Delete Coprocessor call | Major | regionserver |
| [HBASE-17940](https://issues.apache.org/jira/browse/HBASE-17940) | HMaster can not start due to Jasper related classes conflict | Blocker | dependencies, pom |
| [HBASE-17936](https://issues.apache.org/jira/browse/HBASE-17936) | Refine sum endpoint example in ref guide | Minor | documentation |
| [HBASE-17930](https://issues.apache.org/jira/browse/HBASE-17930) | Avoid using Canary.sniff in HBaseTestingUtility | Major | canary, test |
| [HBASE-16875](https://issues.apache.org/jira/browse/HBASE-16875) | Changed try-with-resources in the docs to recommended way | Trivial | documentation |
| [HBASE-17366](https://issues.apache.org/jira/browse/HBASE-17366) | Run TestHFile#testReaderWithoutBlockCache failes | Trivial | test |
| [HBASE-15535](https://issues.apache.org/jira/browse/HBASE-15535) | Correct link to Trafodion | Minor | documentation |
| [HBASE-17903](https://issues.apache.org/jira/browse/HBASE-17903) | Corrected the alias for the link of HBASE-6580 | Trivial | documentation |
| [HBASE-17816](https://issues.apache.org/jira/browse/HBASE-17816) | HRegion#mutateRowWithLocks should update writeRequestCount metric | Major | metrics |
| [HBASE-17905](https://issues.apache.org/jira/browse/HBASE-17905) | [hbase-spark] bulkload does not work when table not exist | Major | . |
| [HBASE-17863](https://issues.apache.org/jira/browse/HBASE-17863) | Procedure V2: Proc Executor cleanup. Split FINISHED state to two states: SUCCESS and FAILED. | Major | proc-v2 |
| [HBASE-17886](https://issues.apache.org/jira/browse/HBASE-17886) | Fix compatibility of ServerSideScanMetrics | Blocker | . |
| [HBASE-17869](https://issues.apache.org/jira/browse/HBASE-17869) | UnsafeAvailChecker wrongly returns false on ppc | Minor | . |
| [HBASE-17871](https://issues.apache.org/jira/browse/HBASE-17871) | scan#setBatch(int) call leads wrong result of VerifyReplication | Minor | . |
| [HBASE-15871](https://issues.apache.org/jira/browse/HBASE-15871) | Memstore flush doesn't finish because of backwardseek() in memstore scanner. | Major | Scanners |
| [HBASE-17785](https://issues.apache.org/jira/browse/HBASE-17785) | RSGroupBasedLoadBalancer fails to assign new table regions when cloning snapshot | Major | . |
| [HBASE-17698](https://issues.apache.org/jira/browse/HBASE-17698) | ReplicationEndpoint choosing sinks | Major | Replication |
| [HBASE-16780](https://issues.apache.org/jira/browse/HBASE-16780) | Since move to protobuf3.1, Cells are limited to 64MB where previous they had no limit | Critical | Protobufs |
| [HBASE-17821](https://issues.apache.org/jira/browse/HBASE-17821) | The CompoundConfiguration#toString is wrong | Trivial | . |
| [HBASE-17660](https://issues.apache.org/jira/browse/HBASE-17660) | HFileSplitter is not being applied during full table restore | Major | . |
| [HBASE-17287](https://issues.apache.org/jira/browse/HBASE-17287) | Master becomes a zombie if filesystem object closes | Blocker | master |
| [HBASE-17807](https://issues.apache.org/jira/browse/HBASE-17807) | correct the value of zookeeper.session.timeout in hbase doc | Trivial | documentation |
| [HBASE-17798](https://issues.apache.org/jira/browse/HBASE-17798) | RpcServer.Listener.Reader can abort due to CancelledKeyException | Major | . |
| [HBASE-17812](https://issues.apache.org/jira/browse/HBASE-17812) | Remove RpcConnection from pool in AbstractRpcClient.cancelConnections | Major | Client, rpc |
| [HBASE-16014](https://issues.apache.org/jira/browse/HBASE-16014) | Get and Put constructor argument lists are divergent | Major | . |
| [HBASE-17582](https://issues.apache.org/jira/browse/HBASE-17582) | Drop page cache hint is broken | Critical | Compaction, io |
| [HBASE-16084](https://issues.apache.org/jira/browse/HBASE-16084) | Clean up the stale references in javadoc | Minor | . |
| [HBASE-17426](https://issues.apache.org/jira/browse/HBASE-17426) | Inconsistent environment variable names for enabling JMX | Major | . |
| [HBASE-17792](https://issues.apache.org/jira/browse/HBASE-17792) | Use a shared thread pool for AtomicityWriter, AtomicGetReader, AtomicScanReader's connections in TestAcidGuarantees | Minor | . |
| [HBASE-17723](https://issues.apache.org/jira/browse/HBASE-17723) | ClientAsyncPrefetchScanner may end prematurely when the size of the cache is one | Major | . |
| [HBASE-17779](https://issues.apache.org/jira/browse/HBASE-17779) | disable\_table\_replication returns misleading message and does not turn off replication | Major | Replication |
| [HBASE-17780](https://issues.apache.org/jira/browse/HBASE-17780) | BoundedByteBufferPool "At capacity" messages are not actionable | Minor | . |
| [HBASE-17501](https://issues.apache.org/jira/browse/HBASE-17501) | NullPointerException after Datanodes Decommissioned and Terminated | Minor | Filesystem Integration, Operability |
| [HBASE-17773](https://issues.apache.org/jira/browse/HBASE-17773) | VerifyReplication tool wrongly emits warning "ERROR: Invalid argument '--recomparesleep=xx'" | Trivial | . |
| [HBASE-17746](https://issues.apache.org/jira/browse/HBASE-17746) | TestSimpleRpcScheduler.testCoDelScheduling is broken | Major | integration tests |
| [HBASE-17772](https://issues.apache.org/jira/browse/HBASE-17772) | IntegrationTestRSGroup won't run | Minor | rsgroup |
| [HBASE-17712](https://issues.apache.org/jira/browse/HBASE-17712) | Remove/Simplify the logic of RegionScannerImpl.handleFileNotFound | Major | regionserver |
| [HBASE-17763](https://issues.apache.org/jira/browse/HBASE-17763) | IPCUtil.wrapException will wrap DoNotRetryIOException with IOException | Major | IPC/RPC |
| [HBASE-17736](https://issues.apache.org/jira/browse/HBASE-17736) | Some options can't be configured by the shell | Minor | . |
| [HBASE-17761](https://issues.apache.org/jira/browse/HBASE-17761) | Test TestRemoveRegionMetrics.testMoveRegion fails intermittently because of race condition | Major | Region Assignment |
| [HBASE-17760](https://issues.apache.org/jira/browse/HBASE-17760) | HDFS Balancer doc is misleading | Minor | documentation |
| [HBASE-17718](https://issues.apache.org/jira/browse/HBASE-17718) | Difference between RS's servername and its ephemeral node cause SSH stop working | Major | . |
| [HBASE-17729](https://issues.apache.org/jira/browse/HBASE-17729) | Missing shortcuts for some useful HCD options | Trivial | shell |
| [HBASE-17717](https://issues.apache.org/jira/browse/HBASE-17717) | Incorrect ZK ACL set for HBase superuser | Critical | security, Zookeeper |
| [HBASE-17460](https://issues.apache.org/jira/browse/HBASE-17460) | enable\_table\_replication can not perform cyclic replication of a table | Critical | Replication |
| [HBASE-16630](https://issues.apache.org/jira/browse/HBASE-16630) | Fragmentation in long running Bucket Cache | Critical | BucketCache |
| [HBASE-17722](https://issues.apache.org/jira/browse/HBASE-17722) | Metrics subsystem stop/start messages add a lot of useless bulk to operational logging | Trivial | metrics |
| [HBASE-17710](https://issues.apache.org/jira/browse/HBASE-17710) | HBase in standalone mode creates directories with 777 permission | Major | regionserver |
| [HBASE-17673](https://issues.apache.org/jira/browse/HBASE-17673) | Monitored RPC Handler not shown in the WebUI | Minor | . |
| [HBASE-17688](https://issues.apache.org/jira/browse/HBASE-17688) | MultiRowRangeFilter not working correctly if given same start and stop RowKey | Minor | . |
| [HBASE-17699](https://issues.apache.org/jira/browse/HBASE-17699) | Fix TestLockProcedure | Blocker | proc-v2 |
| [HBASE-17674](https://issues.apache.org/jira/browse/HBASE-17674) | Major compaction may be cancelled in CompactionChecker | Major | Compaction |
| [HBASE-17682](https://issues.apache.org/jira/browse/HBASE-17682) | Region stuck in merging\_new state indefinitely | Major | . |
| [HBASE-17069](https://issues.apache.org/jira/browse/HBASE-17069) | RegionServer writes invalid META entries for split daughters in some circumstances | Blocker | wal |
| [HBASE-17677](https://issues.apache.org/jira/browse/HBASE-17677) | ServerName parsing from directory name should be more robust to errors from guava's HostAndPort | Major | wal |
| [HBASE-13882](https://issues.apache.org/jira/browse/HBASE-13882) | Fix RegionSplitPolicy section in HBase book | Trivial | documentation |
| [HBASE-17675](https://issues.apache.org/jira/browse/HBASE-17675) | ReplicationEndpoint should choose new sinks if a SaslException occurs | Major | . |
| [HBASE-15328](https://issues.apache.org/jira/browse/HBASE-15328) | Unvalidated Redirect in HMaster | Minor | security |
| [HBASE-17661](https://issues.apache.org/jira/browse/HBASE-17661) | fix the queue length passed to FastPathBalancedQueueRpcExecutor | Minor | . |
| [HBASE-17653](https://issues.apache.org/jira/browse/HBASE-17653) | HBASE-17624 rsgroup synchronizations will (distributed) deadlock | Major | rsgroup |
| [HBASE-17658](https://issues.apache.org/jira/browse/HBASE-17658) | Fix bookkeeping error with max regions for a table | Major | Balancer |
| [HBASE-17421](https://issues.apache.org/jira/browse/HBASE-17421) | Update refguide w.r.t. MOB Sweeper | Major | documentation, mob |
| [HBASE-17649](https://issues.apache.org/jira/browse/HBASE-17649) | REST API for scan should return 410 when table is disabled | Major | . |
| [HBASE-17640](https://issues.apache.org/jira/browse/HBASE-17640) | Unittest error in TestMobCompactor with different timezone | Minor | mob |
| [HBASE-17624](https://issues.apache.org/jira/browse/HBASE-17624) | Address late review of HBASE-6721, rsgroups feature | Major | rsgroup |
| [HBASE-17639](https://issues.apache.org/jira/browse/HBASE-17639) | Do not stop server if ReplicationSourceManager's waitUntilCanBePushed throws InterruptedException | Major | Replication |
| [HBASE-17558](https://issues.apache.org/jira/browse/HBASE-17558) | ZK dumping jsp should escape html | Minor | security, UI |
| [HBASE-9702](https://issues.apache.org/jira/browse/HBASE-9702) | Change unittests that use "table" or "testtable" to use method names. | Major | test |
| [HBASE-17611](https://issues.apache.org/jira/browse/HBASE-17611) | Thrift 2 per-call latency metrics are capped at ~ 2 seconds | Major | metrics, Thrift |
| [HBASE-17603](https://issues.apache.org/jira/browse/HBASE-17603) | REST API for scan should return 404 when table does not exist | Blocker | REST, scan |
| [HBASE-17638](https://issues.apache.org/jira/browse/HBASE-17638) | Remove duplicated initialization of CacheConfig in HRegionServer | Minor | . |
| [HBASE-17622](https://issues.apache.org/jira/browse/HBASE-17622) | Add hbase-metrics package to TableMapReduceUtil | Trivial | mapreduce |
| [HBASE-17616](https://issues.apache.org/jira/browse/HBASE-17616) | Incorrect actions performed by CM | Major | . |
| [HBASE-17105](https://issues.apache.org/jira/browse/HBASE-17105) | Annotate RegionServerObserver | Major | . |
| [HBASE-17381](https://issues.apache.org/jira/browse/HBASE-17381) | ReplicationSourceWorkerThread can die due to unhandled exceptions | Major | Replication |
| [HBASE-17565](https://issues.apache.org/jira/browse/HBASE-17565) | StochasticLoadBalancer may incorrectly skip balancing due to skewed multiplier sum | Critical | . |
| [HBASE-17606](https://issues.apache.org/jira/browse/HBASE-17606) | Fix failing TestRpcControllerFactory introduced by HBASE-17508 | Major | Client, scan |
| [HBASE-17187](https://issues.apache.org/jira/browse/HBASE-17187) | DoNotRetryExceptions from coprocessors should bubble up to the application | Major | . |
| [HBASE-17578](https://issues.apache.org/jira/browse/HBASE-17578) | Thrift per-method metrics should still update in the case of exceptions | Major | Thrift |
| [HBASE-17593](https://issues.apache.org/jira/browse/HBASE-17593) | Fix build with hadoop 3 profile | Major | . |
| [HBASE-17601](https://issues.apache.org/jira/browse/HBASE-17601) | close() in TableRecordReaderImpl assumes the split has started | Minor | hadoop2 |
| [HBASE-17587](https://issues.apache.org/jira/browse/HBASE-17587) | Do not Rethrow DoNotRetryIOException as UnknownScannerException | Major | Coprocessors, regionserver, rpc |
| [HBASE-17581](https://issues.apache.org/jira/browse/HBASE-17581) | mvn clean test -PskipXXXTests does not work properly for some modules | Major | . |
| [HBASE-16621](https://issues.apache.org/jira/browse/HBASE-16621) | HBCK should have -fixHFileLinks | Major | . |
| [HBASE-17522](https://issues.apache.org/jira/browse/HBASE-17522) | RuntimeExceptions from MemoryMXBean should not take down server process | Major | regionserver |
| [HBASE-17197](https://issues.apache.org/jira/browse/HBASE-17197) | hfile does not work in 2.0 | Major | HFile |
| [HBASE-17538](https://issues.apache.org/jira/browse/HBASE-17538) | HDFS.setStoragePolicy() logs errors on local fs | Major | . |
| [HBASE-16785](https://issues.apache.org/jira/browse/HBASE-16785) | We are not running all tests | Major | build, test |
| [HBASE-17540](https://issues.apache.org/jira/browse/HBASE-17540) | Change SASL server GSSAPI callback log line from DEBUG to TRACE in RegionServer to reduce log volumes in DEBUG mode | Minor | regionserver |
| [HBASE-17271](https://issues.apache.org/jira/browse/HBASE-17271) | hbase-thrift QA tests only run one test | Major | . |
| [HBASE-17407](https://issues.apache.org/jira/browse/HBASE-17407) | Correct update of maxFlushedSeqId in HRegion | Major | wal |
| [HBASE-17489](https://issues.apache.org/jira/browse/HBASE-17489) | ClientScanner may send a next request to a RegionScanner which has been exhausted | Critical | Client, scan |
| [HBASE-17357](https://issues.apache.org/jira/browse/HBASE-17357) | PerformanceEvaluation parameters parsing triggers NPE. | Minor | Performance, test |
| [HBASE-17496](https://issues.apache.org/jira/browse/HBASE-17496) | RSGroup shell commands:get\_server\_rsgroup don't work and commands display an incorrect result size | Major | shell |
| [HBASE-17486](https://issues.apache.org/jira/browse/HBASE-17486) | Tighten the contract for batch client methods | Trivial | API |
| [HBASE-17482](https://issues.apache.org/jira/browse/HBASE-17482) | mvcc mechanism fails when using mvccPreAssign | Critical | . |
| [HBASE-17469](https://issues.apache.org/jira/browse/HBASE-17469) | Properly handle empty TableName in TablePermission#readFields and #write | Major | findbugs |
| [HBASE-17475](https://issues.apache.org/jira/browse/HBASE-17475) | Stack overflow in AsyncProcess if retry too much | Major | API, Client |
| [HBASE-17464](https://issues.apache.org/jira/browse/HBASE-17464) | Fix HBaseTestingUtility.getNewDataTestDirOnTestFS to always return a unique path | Minor | test |
| [HBASE-17450](https://issues.apache.org/jira/browse/HBASE-17450) | TablePermission#equals throws NPE after namespace support was added | Major | findbugs |
| [HBASE-17452](https://issues.apache.org/jira/browse/HBASE-17452) | Failed taking snapshot - region Manifest proto-message too large | Major | snapshots |
| [HBASE-17434](https://issues.apache.org/jira/browse/HBASE-17434) | New Synchronization Scheme for Compaction Pipeline | Major | . |
| [HBASE-17445](https://issues.apache.org/jira/browse/HBASE-17445) | Count size of serialized exceptions in checking max result size quota | Major | . |
| [HBASE-17429](https://issues.apache.org/jira/browse/HBASE-17429) | HBase bulkload cannot support HDFS viewFs | Major | . |
| [HBASE-17435](https://issues.apache.org/jira/browse/HBASE-17435) | Call to preCommitStoreFile() hook encounters SaslException in secure deployment | Major | . |
| [HBASE-17430](https://issues.apache.org/jira/browse/HBASE-17430) | dead links in ref guide to class javadocs that moved out of user APIs. | Major | documentation, website |
| [HBASE-17424](https://issues.apache.org/jira/browse/HBASE-17424) | Protect REST client against malicious XML responses. | Major | REST |
| [HBASE-17351](https://issues.apache.org/jira/browse/HBASE-17351) | Enforcer plugin fails with NullPointerException | Critical | build |
| [HBASE-17290](https://issues.apache.org/jira/browse/HBASE-17290) | Potential loss of data for replication of bulk loaded hfiles | Major | . |
| [HBASE-17390](https://issues.apache.org/jira/browse/HBASE-17390) | Online update of configuration for all servers leaves out masters | Major | . |
| [HBASE-17403](https://issues.apache.org/jira/browse/HBASE-17403) | ClientAsyncPrefetchScanner doesn’t load any data if the MaxResultSize is too small | Major | . |
| [HBASE-17387](https://issues.apache.org/jira/browse/HBASE-17387) | Reduce the overhead of exception report in RegionActionResult for multi() | Minor | . |
| [HBASE-17385](https://issues.apache.org/jira/browse/HBASE-17385) | Change usage documentation from bin/hbase to hbase in various tools | Major | . |
| [HBASE-17374](https://issues.apache.org/jira/browse/HBASE-17374) | ZKPermissionWatcher crashed when grant after region close | Critical | regionserver |
| [HBASE-17376](https://issues.apache.org/jira/browse/HBASE-17376) | ClientAsyncPrefetchScanner may fail due to too many rows | Major | . |
| [HBASE-17330](https://issues.apache.org/jira/browse/HBASE-17330) | SnapshotFileCache will always refresh the file cache | Minor | snapshots |
| [HBASE-16663](https://issues.apache.org/jira/browse/HBASE-16663) | JMX ConnectorServer stopped when unauthorized user try to stop HM/RS/cluster | Critical | metrics, security |
| [HBASE-17341](https://issues.apache.org/jira/browse/HBASE-17341) | Add a timeout during replication endpoint termination | Critical | . |
| [HBASE-17328](https://issues.apache.org/jira/browse/HBASE-17328) | Properly dispose of looped replication peers | Critical | Replication |
| [HBASE-17347](https://issues.apache.org/jira/browse/HBASE-17347) | ExportSnapshot may write snapshot info file to wrong directory when specifying target name | Minor | snapshots |
| [HBASE-17344](https://issues.apache.org/jira/browse/HBASE-17344) | The regionserver web UIs miss the coprocessors of RegionServerCoprocessorHost. | Minor | . |
| [HBASE-17333](https://issues.apache.org/jira/browse/HBASE-17333) | HBASE-17294 always ensures CompactingMemstore is default | Critical | . |
| [HBASE-17326](https://issues.apache.org/jira/browse/HBASE-17326) | Fix findbugs warning in BufferedMutatorParams | Major | . |
| [HBASE-17309](https://issues.apache.org/jira/browse/HBASE-17309) | Fix connection leaks in TestAcidGuarantees | Minor | integration tests |
| [HBASE-17297](https://issues.apache.org/jira/browse/HBASE-17297) | Single Filter in parenthesis cannot be parsed correctly | Major | Filters |
| [HBASE-17237](https://issues.apache.org/jira/browse/HBASE-17237) | Override the correct compact method in HMobStore | Major | mob |
| [HBASE-16985](https://issues.apache.org/jira/browse/HBASE-16985) | TestClusterId failed due to wrong hbase rootdir | Minor | test |
| [HBASE-15437](https://issues.apache.org/jira/browse/HBASE-15437) | Response size calculated in RPCServer for warning tooLarge responses does NOT count CellScanner payload | Major | IPC/RPC |
| [HBASE-17256](https://issues.apache.org/jira/browse/HBASE-17256) | Rpc handler monitoring will be removed when the task queue is full | Major | . |
| [HBASE-17170](https://issues.apache.org/jira/browse/HBASE-17170) | HBase is also retrying DoNotRetryIOException because of class loader differences. | Major | . |
| [HBASE-17252](https://issues.apache.org/jira/browse/HBASE-17252) | Wrong arguments for ValueAndTagRewriteCell in CellUtil | Major | . |
| [HBASE-16841](https://issues.apache.org/jira/browse/HBASE-16841) | Data loss in MOB files after cloning a snapshot and deleting that snapshot | Blocker | mob, snapshots |
| [HBASE-17118](https://issues.apache.org/jira/browse/HBASE-17118) | StoreScanner leaked in KeyValueHeap | Major | . |
| [HBASE-17231](https://issues.apache.org/jira/browse/HBASE-17231) | Region#getCellCompartor sp? | Trivial | . |
| [HBASE-16886](https://issues.apache.org/jira/browse/HBASE-16886) | hbase-client: scanner with reversed=true and small=true gets no result | Major | . |
| [HBASE-17112](https://issues.apache.org/jira/browse/HBASE-17112) | Prevent setting timestamp of delta operations the same as previous value's | Major | . |
| [HBASE-16209](https://issues.apache.org/jira/browse/HBASE-16209) | Provide an ExponentialBackOffPolicy sleep between failed region open requests | Major | . |
| [HBASE-17206](https://issues.apache.org/jira/browse/HBASE-17206) | FSHLog may roll a new writer successfully with unflushed entries | Critical | wal |
| [HBASE-17224](https://issues.apache.org/jira/browse/HBASE-17224) | There are lots of spelling errors in the HBase logging and exception messages | Trivial | Client, io, mapreduce, master, regionserver, security, wal |
| [HBASE-17192](https://issues.apache.org/jira/browse/HBASE-17192) | remove use of scala-tools.org from pom | Blocker | spark, website |
| [HBASE-17186](https://issues.apache.org/jira/browse/HBASE-17186) | MasterProcedureTestingUtility#testRecoveryAndDoubleExecution displays stale procedure state info | Minor | proc-v2, test |
| [HBASE-17072](https://issues.apache.org/jira/browse/HBASE-17072) | CPU usage starts to climb up to 90-100% when using G1GC; purge ThreadLocal usage | Critical | Performance, regionserver |
| [HBASE-17116](https://issues.apache.org/jira/browse/HBASE-17116) | [PerformanceEvaluation] Add option to configure block size | Trivial | tooling |
| [HBASE-17127](https://issues.apache.org/jira/browse/HBASE-17127) | Locate region should fail fast if underlying Connection already closed | Major | . |
| [HBASE-17144](https://issues.apache.org/jira/browse/HBASE-17144) | Possible offheap read ByteBuffers leak | Major | rpc |
| [HBASE-17160](https://issues.apache.org/jira/browse/HBASE-17160) | Undo unnecessary inter-module dependency; spark to hbase-it and hbase-it to shell | Minor | . |
| [HBASE-17171](https://issues.apache.org/jira/browse/HBASE-17171) | IntegrationTestTimeBoundedRequestsWithRegionReplicas fails with obtuse error when readers have no time to run | Minor | integration tests |
| [HBASE-17158](https://issues.apache.org/jira/browse/HBASE-17158) | Avoid deadlock caused by HRegion#doDelta | Major | . |
| [HBASE-17166](https://issues.apache.org/jira/browse/HBASE-17166) | ITBLL fails on master unable to find hbase-protocol-shaded content | Major | . |
| [HBASE-17095](https://issues.apache.org/jira/browse/HBASE-17095) | The ClientSimpleScanner keeps retrying if the hfile is corrupt or cannot found | Major | regionserver, scan |
| [HBASE-16989](https://issues.apache.org/jira/browse/HBASE-16989) | RowProcess#postBatchMutate doesn’t be executed before the mvcc transaction completion | Major | . |
| [HBASE-17058](https://issues.apache.org/jira/browse/HBASE-17058) | Lower epsilon used for jitter verification from HBASE-15324 | Major | Compaction |
| [HBASE-17082](https://issues.apache.org/jira/browse/HBASE-17082) | ForeignExceptionUtil isn’t packaged when building shaded protocol with -Pcompile-protobuf | Major | . |
| [HBASE-17091](https://issues.apache.org/jira/browse/HBASE-17091) | IntegrationTestZKAndFSPermissions failed with 'KeeperException$NoNodeException' | Major | . |
| [HBASE-17092](https://issues.apache.org/jira/browse/HBASE-17092) | Both LoadIncrementalHFiles#doBulkLoad() methods should set return value | Major | . |
| [HBASE-17044](https://issues.apache.org/jira/browse/HBASE-17044) | Fix merge failed before creating merged region leaves meta inconsistent | Critical | regionserver |
| [HBASE-17074](https://issues.apache.org/jira/browse/HBASE-17074) | PreCommit job always fails because of OOM | Critical | build |
| [HBASE-16345](https://issues.apache.org/jira/browse/HBASE-16345) | RpcRetryingCallerWithReadReplicas#call() should catch some RegionServer Exceptions | Major | Client |
| [HBASE-17062](https://issues.apache.org/jira/browse/HBASE-17062) | RegionSplitter throws ClassCastException | Minor | util |
| [HBASE-16962](https://issues.apache.org/jira/browse/HBASE-16962) | Add readPoint to preCompactScannerOpen() and preFlushScannerOpen() API | Major | . |
| [HBASE-17039](https://issues.apache.org/jira/browse/HBASE-17039) | SimpleLoadBalancer schedules large amount of invalid region moves | Major | Balancer |
| [HBASE-17020](https://issues.apache.org/jira/browse/HBASE-17020) | keylen in midkey() dont computed correctly | Major | HFile |
| [HBASE-16938](https://issues.apache.org/jira/browse/HBASE-16938) | TableCFsUpdater maybe failed due to no write permission on peerNode | Major | Replication |
| [HBASE-17052](https://issues.apache.org/jira/browse/HBASE-17052) | compile-protobuf profile does not compile protobufs in some modules anymore | Major | . |
| [HBASE-17054](https://issues.apache.org/jira/browse/HBASE-17054) | Compactor#preCreateCoprocScanner should be passed user | Major | . |
| [HBASE-16983](https://issues.apache.org/jira/browse/HBASE-16983) | TestMultiTableSnapshotInputFormat failing with Unable to create region directory: /tmp/... | Minor | test |
| [HBASE-17042](https://issues.apache.org/jira/browse/HBASE-17042) | Remove 'public' keyword from MasterObserver interface | Minor | Coprocessors |
| [HBASE-17033](https://issues.apache.org/jira/browse/HBASE-17033) | LogRoller makes a lot of allocations unnecessarily | Major | . |
| [HBASE-16992](https://issues.apache.org/jira/browse/HBASE-16992) | The usage of mutation from CP is weird. | Minor | . |
| [HBASE-17032](https://issues.apache.org/jira/browse/HBASE-17032) | CallQueueTooBigException and CallDroppedException should not be triggering PFFE | Major | Client |
| [HBASE-16960](https://issues.apache.org/jira/browse/HBASE-16960) | RegionServer hang when aborting | Critical | . |
| [HBASE-14329](https://issues.apache.org/jira/browse/HBASE-14329) | Report region in transition only ever operates on one region | Major | Region Assignment |
| [HBASE-16964](https://issues.apache.org/jira/browse/HBASE-16964) | Successfully archived files are not cleared from compacted store file list if archiving of any file fails | Blocker | regionserver |
| [HBASE-16976](https://issues.apache.org/jira/browse/HBASE-16976) | hbase-protocol-shaded module generates classes to wrong directory | Minor | build |
| [HBASE-16931](https://issues.apache.org/jira/browse/HBASE-16931) | Setting cell's seqId to zero in compaction flow might cause RS down. | Critical | regionserver |
| [HBASE-16980](https://issues.apache.org/jira/browse/HBASE-16980) | TestRowProcessorEndpoint failing consistently | Major | . |
| [HBASE-16966](https://issues.apache.org/jira/browse/HBASE-16966) | Re-enable TestSimpleRpcScheduler#testCoDelScheduling in master branch | Major | test |
| [HBASE-16974](https://issues.apache.org/jira/browse/HBASE-16974) | Update os-maven-plugin to 1.4.1.final+ for building shade file on RHEL/CentOS | Minor | . |
| [HBASE-16971](https://issues.apache.org/jira/browse/HBASE-16971) | The passed durability of Append/Increment isn't used in wal sync | Major | . |
| [HBASE-16743](https://issues.apache.org/jira/browse/HBASE-16743) | TestSimpleRpcScheduler#testCoDelScheduling is broke | Major | rpc |
| [HBASE-16948](https://issues.apache.org/jira/browse/HBASE-16948) | Fix inconsistency between HRegion and Region javadoc on getRowLock | Major | . |
| [HBASE-16949](https://issues.apache.org/jira/browse/HBASE-16949) | Fix RAT License complaint about the hbase-protocol-shaded/src/main/patches content | Major | . |
| [HBASE-16939](https://issues.apache.org/jira/browse/HBASE-16939) | ExportSnapshot: set owner and permission on right directory | Minor | . |
| [HBASE-16000](https://issues.apache.org/jira/browse/HBASE-16000) | Table#checkAndPut() docs are too vague | Minor | documentation |
| [HBASE-16880](https://issues.apache.org/jira/browse/HBASE-16880) | Correct the javadoc/behaviour of the APIs in ByteBufferUtils | Major | . |
| [HBASE-16930](https://issues.apache.org/jira/browse/HBASE-16930) | AssignmentManager#checkWals() function can recur infinitely | Major | Region Assignment |
| [HBASE-16887](https://issues.apache.org/jira/browse/HBASE-16887) | Allow setting different hadoopcheck versions in precommit for different branches | Major | build |
| [HBASE-15684](https://issues.apache.org/jira/browse/HBASE-15684) | Fix the broken log file size accounting | Major | wal |
| [HBASE-16870](https://issues.apache.org/jira/browse/HBASE-16870) | Add the metrics of replication sources which were transformed from other dead rs to ReplicationLoad | Minor | Replication |
| [HBASE-16815](https://issues.apache.org/jira/browse/HBASE-16815) | Low scan ratio in RPC queue tuning triggers divide by zero exception | Major | regionserver, rpc |
| [HBASE-16829](https://issues.apache.org/jira/browse/HBASE-16829) | DemoClient should detect secure mode | Major | . |
| [HBASE-16754](https://issues.apache.org/jira/browse/HBASE-16754) | Regions failing compaction due to referencing non-existent store file | Blocker | . |
| [HBASE-15348](https://issues.apache.org/jira/browse/HBASE-15348) | Fix tests broken by recent metrics re-work | Major | metrics, test |
| [HBASE-16910](https://issues.apache.org/jira/browse/HBASE-16910) | Avoid NPE when starting StochasticLoadBalancer | Minor | Balancer |
| [HBASE-16701](https://issues.apache.org/jira/browse/HBASE-16701) | TestHRegion and TestHRegionWithInMemoryFlush timing out | Major | regionserver, test |
| [HBASE-16889](https://issues.apache.org/jira/browse/HBASE-16889) | Proc-V2: verifyTables in the IntegrationTestDDLMasterFailover test after each table DDL is incorrect | Major | proc-v2 |
| [HBASE-16884](https://issues.apache.org/jira/browse/HBASE-16884) | Add HBase-2.0.x to the hadoop version support matrix in our documentation | Blocker | documentation |
| [HBASE-16752](https://issues.apache.org/jira/browse/HBASE-16752) | Upgrading from 1.2 to 1.3 can lead to replication failures due to difference in RPC size limit | Major | Replication, rpc |
| [HBASE-16578](https://issues.apache.org/jira/browse/HBASE-16578) | Mob data loss after mob compaction and normal compaction | Major | mob |
| [HBASE-16824](https://issues.apache.org/jira/browse/HBASE-16824) | Writer.flush() can be called on already closed streams in WAL roll | Major | wal |
| [HBASE-16866](https://issues.apache.org/jira/browse/HBASE-16866) | Avoid NPE in AsyncRequestFutureImpl#updateStats | Minor | . |
| [HBASE-16733](https://issues.apache.org/jira/browse/HBASE-16733) | add hadoop 3.0.0-alpha1 to precommit checks | Major | build, hadoop3 |
| [HBASE-16283](https://issues.apache.org/jira/browse/HBASE-16283) | Batch Append/Increment will always fail if set ReturnResults to false | Minor | API |
| [HBASE-16712](https://issues.apache.org/jira/browse/HBASE-16712) | fix hadoop-3.0 profile mvn install | Major | build, hadoop3 |
| [HBASE-16721](https://issues.apache.org/jira/browse/HBASE-16721) | Concurrency issue in WAL unflushed seqId tracking | Critical | wal |
| [HBASE-16326](https://issues.apache.org/jira/browse/HBASE-16326) | CellModel / RowModel should override 'equals', 'hashCode' and 'toString' | Trivial | REST |
| [HBASE-16855](https://issues.apache.org/jira/browse/HBASE-16855) | Avoid NPE in MetricsConnection’s construction | Minor | . |
| [HBASE-16856](https://issues.apache.org/jira/browse/HBASE-16856) | Exception message in SyncRunner.run() should print currentSequence | Minor | wal |
| [HBASE-16853](https://issues.apache.org/jira/browse/HBASE-16853) | Regions are assigned to Region Servers in /hbase/draining after HBase Master failover | Major | Balancer, Region Assignment |
| [HBASE-16810](https://issues.apache.org/jira/browse/HBASE-16810) | HBase Balancer throws ArrayIndexOutOfBoundsException when regionservers are in /hbase/draining znode and unloaded | Major | Balancer |
| [HBASE-16664](https://issues.apache.org/jira/browse/HBASE-16664) | Timeout logic in AsyncProcess is broken | Major | . |
| [HBASE-16724](https://issues.apache.org/jira/browse/HBASE-16724) | Snapshot owner can't clone | Major | snapshots |
| [HBASE-16807](https://issues.apache.org/jira/browse/HBASE-16807) | RegionServer will fail to report new active Hmaster until HMaster/RegionServer failover | Major | regionserver |
| [HBASE-16716](https://issues.apache.org/jira/browse/HBASE-16716) | OfflineMetaRepair leaves empty directory inside /hbase/WALs which remains forever | Minor | hbck |
| [HBASE-16746](https://issues.apache.org/jira/browse/HBASE-16746) | The log of “region close” should differ from “region move” | Minor | . |
| [HBASE-16808](https://issues.apache.org/jira/browse/HBASE-16808) | Included the generated, shaded java files from "HBASE-15638 Shade protobuf" in our src assembly | Blocker | . |
| [HBASE-16731](https://issues.apache.org/jira/browse/HBASE-16731) | Inconsistent results from the Get/Scan if we use the empty FilterList | Minor | . |
| [HBASE-16801](https://issues.apache.org/jira/browse/HBASE-16801) | The Append/Increment may return the data from future | Critical | . |
| [HBASE-15109](https://issues.apache.org/jira/browse/HBASE-15109) | HM/RS failed to start when "fs.hdfs.impl.disable.cache" is set to true | Critical | regionserver |
| [HBASE-16622](https://issues.apache.org/jira/browse/HBASE-16622) | Fix some issues with the HBase reference guide | Major | documentation |
| [HBASE-16793](https://issues.apache.org/jira/browse/HBASE-16793) | Exclude shaded protobuf files from rat check | Major | build |
| [HBASE-16699](https://issues.apache.org/jira/browse/HBASE-16699) | Overflows in AverageIntervalRateLimiter's refill() and getWaitInterval() | Major | . |
| [HBASE-16771](https://issues.apache.org/jira/browse/HBASE-16771) | VerifyReplication should increase GOODROWS counter if re-comparison passes | Major | . |
| [HBASE-16768](https://issues.apache.org/jira/browse/HBASE-16768) | Inconsistent results from the Append/Increment | Minor | . |
| [HBASE-16767](https://issues.apache.org/jira/browse/HBASE-16767) | Mob compaction needs to clean up files in /hbase/mobdir/.tmp and /hbase/mobdir/.tmp/.bulkload when running into IO exceptions | Major | mob |
| [HBASE-16681](https://issues.apache.org/jira/browse/HBASE-16681) | Fix flaky TestReplicationSourceManagerZkImpl | Major | . |
| [HBASE-16753](https://issues.apache.org/jira/browse/HBASE-16753) | There is a mismatch between suggested Java version in hbase-env.sh | Minor | scripts |
| [HBASE-16644](https://issues.apache.org/jira/browse/HBASE-16644) | Errors when reading legit HFile Trailer of old (v2.0) format file | Critical | HFile |
| [HBASE-16763](https://issues.apache.org/jira/browse/HBASE-16763) | Remove unintentional dependency on net.sf.ehcache.search.Results | Major | . |
| [HBASE-16764](https://issues.apache.org/jira/browse/HBASE-16764) | hbase-protocol-shaded generate-shaded-classes profile unpacks shaded java files into wrong location | Major | build |
| [HBASE-16739](https://issues.apache.org/jira/browse/HBASE-16739) | Timed out exception message should include encoded region name | Minor | . |
| [HBASE-16678](https://issues.apache.org/jira/browse/HBASE-16678) | MapReduce jobs do not update counters from ScanMetrics | Major | . |
| [HBASE-16732](https://issues.apache.org/jira/browse/HBASE-16732) | Avoid possible NPE in MetaTableLocator | Minor | . |
| [HBASE-16723](https://issues.apache.org/jira/browse/HBASE-16723) | RMI registry is not destroyed after stopping JMX Connector Server | Major | metrics |
| [HBASE-16711](https://issues.apache.org/jira/browse/HBASE-16711) | Fix hadoop-3.0 profile compile | Major | build, hadoop3 |
| [HBASE-16696](https://issues.apache.org/jira/browse/HBASE-16696) | After HBASE-16604 - does not release blocks in case of scanner exception | Critical | . |
| [HBASE-16682](https://issues.apache.org/jira/browse/HBASE-16682) | Fix Shell tests failure. NoClassDefFoundError for MiniKdc | Major | . |
| [HBASE-16660](https://issues.apache.org/jira/browse/HBASE-16660) | ArrayIndexOutOfBounds during the majorCompactionCheck in DateTieredCompaction | Critical | Compaction |
| [HBASE-16643](https://issues.apache.org/jira/browse/HBASE-16643) | Reverse scanner heap creation may not allow MSLAB closure due to improper ref counting of segments | Critical | . |
| [HBASE-16649](https://issues.apache.org/jira/browse/HBASE-16649) | Truncate table with splits preserved can cause both data loss and truncated data appeared again | Major | . |
| [HBASE-16704](https://issues.apache.org/jira/browse/HBASE-16704) | Scan will be broken while working with DBE and KeyValueCodecWithTags | Major | . |
| [HBASE-16645](https://issues.apache.org/jira/browse/HBASE-16645) | Wrong range of Cells is caused by CellFlatMap#tailMap, headMap, and SubMap | Major | . |
| [HBASE-16665](https://issues.apache.org/jira/browse/HBASE-16665) | Check whether KeyValueUtil.createXXX could be replaced by CellUtil without copy | Major | . |
| [HBASE-16697](https://issues.apache.org/jira/browse/HBASE-16697) | bump TestRegionServerMetrics to LargeTests | Trivial | test |
| [HBASE-16679](https://issues.apache.org/jira/browse/HBASE-16679) | Flush throughput controller: Minor perf change and fix flaky TestFlushWithThroughputController | Major | . |
| [HBASE-16693](https://issues.apache.org/jira/browse/HBASE-16693) | The commit of HBASE-16604 creates a unrelated folder | Critical | . |
| [HBASE-16688](https://issues.apache.org/jira/browse/HBASE-16688) | Split TestMasterFailoverWithProcedures | Major | proc-v2, test |
| [HBASE-16604](https://issues.apache.org/jira/browse/HBASE-16604) | Scanner retries on IOException can cause the scans to miss data | Critical | regionserver, Scanners |
| [HBASE-16662](https://issues.apache.org/jira/browse/HBASE-16662) | Fix open POODLE vulnerabilities | Major | REST, Thrift |
| [HBASE-16675](https://issues.apache.org/jira/browse/HBASE-16675) | Average region size may be incorrect when there is region whose RegionLoad cannot be retrieved | Major | . |
| [HBASE-16670](https://issues.apache.org/jira/browse/HBASE-16670) | Make RpcServer#processRequest logic more robust | Minor | . |
| [HBASE-12088](https://issues.apache.org/jira/browse/HBASE-12088) | Remove un-used profiles in non-root poms | Major | . |
| [HBASE-16669](https://issues.apache.org/jira/browse/HBASE-16669) | fix flaky TestAdmin#testmergeRegions | Major | test |
| [HBASE-16294](https://issues.apache.org/jira/browse/HBASE-16294) | hbck reporting "No HDFS region dir found" for replicas | Minor | hbck |
| [HBASE-12949](https://issues.apache.org/jira/browse/HBASE-12949) | Scanner can be stuck in infinite loop if the HFile is corrupted | Major | . |
| [HBASE-16654](https://issues.apache.org/jira/browse/HBASE-16654) | Better handle channelInactive and close for netty rpc client | Major | . |
| [HBASE-16540](https://issues.apache.org/jira/browse/HBASE-16540) | Scan should do additional validation on start and stop row | Major | Client |
| [HBASE-16647](https://issues.apache.org/jira/browse/HBASE-16647) | hbck should do offline reference repair before online repair | Major | . |
| [HBASE-16551](https://issues.apache.org/jira/browse/HBASE-16551) | Cleanup SplitLogManager and CatalogJanitor | Trivial | master |
| [HBASE-16635](https://issues.apache.org/jira/browse/HBASE-16635) | RpcClient under heavy load leaks some netty bytebuf | Minor | . |
| [HBASE-16165](https://issues.apache.org/jira/browse/HBASE-16165) | Decrease RpcServer.callQueueSize before writeResponse causes OOM | Minor | IPC/RPC, rpc |
| [HBASE-16624](https://issues.apache.org/jira/browse/HBASE-16624) | MVCC DeSerialization bug in the HFileScannerImpl | Blocker | HFile |
| [HBASE-16612](https://issues.apache.org/jira/browse/HBASE-16612) | Use array to cache Types for KeyValue.Type.codeToType | Minor | . |
| [HBASE-16491](https://issues.apache.org/jira/browse/HBASE-16491) | A few org.apache.hadoop.hbase.rsgroup classes missing @InterfaceAudience annotation | Minor | API, regionserver |
| [HBASE-16609](https://issues.apache.org/jira/browse/HBASE-16609) | Fake cells EmptyByteBufferedCell created in read path not implementing SettableSequenceId | Major | . |
| [HBASE-16614](https://issues.apache.org/jira/browse/HBASE-16614) | Use daemon thread for netty event loop | Major | IPC/RPC, rpc |
| [HBASE-15624](https://issues.apache.org/jira/browse/HBASE-15624) | Move master branch/hbase-2.0.0 to jdk-8 only | Blocker | build |
| [HBASE-16576](https://issues.apache.org/jira/browse/HBASE-16576) | Shell add\_peer doesn't allow setting cluster\_key for custom endpoints | Major | shell |
| [HBASE-16309](https://issues.apache.org/jira/browse/HBASE-16309) | TestDefaultCompactSelection.testCompactionRatio is flaky | Major | Compaction, test |
| [HBASE-16589](https://issues.apache.org/jira/browse/HBASE-16589) | Adjust log level for FATAL messages from HBaseReplicationEndpoint that are not fatal | Trivial | . |
| [HBASE-16544](https://issues.apache.org/jira/browse/HBASE-16544) | Remove or Clarify 'Using Amazon S3 Storage' section in the reference guide | Major | documentation, Filesystem Integration |
| [HBASE-16572](https://issues.apache.org/jira/browse/HBASE-16572) | Sync method in RecoverableZooKeeper failed to pass callback function in | Minor | Zookeeper |
| [HBASE-16460](https://issues.apache.org/jira/browse/HBASE-16460) | Can't rebuild the BucketAllocator's data structures when BucketCache uses FileIOEngine | Major | BucketCache |
| [HBASE-16556](https://issues.apache.org/jira/browse/HBASE-16556) | The read/write timeout are not used in HTable.delete(List), HTable.get(List), and HTable.existsAll(List) | Minor | . |
| [HBASE-16538](https://issues.apache.org/jira/browse/HBASE-16538) | Version mismatch in HBaseConfiguration.checkDefaultsVersion | Major | . |
| [HBASE-16552](https://issues.apache.org/jira/browse/HBASE-16552) | MiniHBaseCluster#getServerWith() does not ignore stopped RSs | Trivial | test |
| [HBASE-16547](https://issues.apache.org/jira/browse/HBASE-16547) | hbase-archetype-builder shell scripts assume bash is installed in /bin | Trivial | . |
| [HBASE-16375](https://issues.apache.org/jira/browse/HBASE-16375) | Mapreduce mini cluster using HBaseTestingUtility not setting correct resourcemanager and jobhistory webapp address of MapReduceTestingShim | Minor | . |
| [HBASE-16527](https://issues.apache.org/jira/browse/HBASE-16527) | IOExceptions from DFS client still can cause CatalogJanitor to delete referenced files | Major | . |
| [HBASE-15278](https://issues.apache.org/jira/browse/HBASE-15278) | AsyncRPCClient hangs if Connection closes before RPC call response | Blocker | rpc, test |
| [HBASE-16528](https://issues.apache.org/jira/browse/HBASE-16528) | Procedure-V2: ServerCrashProcedure misses owner information | Major | hbase, master, proc-v2 |
| [HBASE-16535](https://issues.apache.org/jira/browse/HBASE-16535) | Use regex to exclude generated classes for findbugs | Major | findbugs |
| [HBASE-16515](https://issues.apache.org/jira/browse/HBASE-16515) | AsyncProcess has incorrent count of tasks if the backoff policy is enabled | Minor | . |
| [HBASE-16490](https://issues.apache.org/jira/browse/HBASE-16490) | Fix race condition between SnapshotManager and SnapshotCleaner | Major | . |
| [HBASE-16409](https://issues.apache.org/jira/browse/HBASE-16409) | Row key for bad row should be properly delimited in VerifyReplication | Minor | . |
| [HBASE-16495](https://issues.apache.org/jira/browse/HBASE-16495) | When accessed via Thrift, all column families have timeToLive equal to -1 | Minor | Thrift |
| [HBASE-16304](https://issues.apache.org/jira/browse/HBASE-16304) | HRegion#RegionScannerImpl#handleFileNotFoundException may lead to deadlock when trying to obtain write lock on updatesLock | Critical | . |
| [HBASE-16270](https://issues.apache.org/jira/browse/HBASE-16270) | Handle duplicate clearing of snapshot in region replicas | Major | Replication |
| [HBASE-16471](https://issues.apache.org/jira/browse/HBASE-16471) | Region Server metrics context will be wrong when machine hostname contain "master" word | Minor | metrics |
| [HBASE-16456](https://issues.apache.org/jira/browse/HBASE-16456) | Fix findbugs warnings in hbase-rsgroup module | Minor | . |
| [HBASE-16464](https://issues.apache.org/jira/browse/HBASE-16464) | archive folder grows bigger and bigger due to corrupt snapshot under tmp dir | Major | snapshots |
| [HBASE-16360](https://issues.apache.org/jira/browse/HBASE-16360) | TableMapReduceUtil addHBaseDependencyJars has the wrong class name for PrefixTreeCodec | Minor | mapreduce |
| [HBASE-16446](https://issues.apache.org/jira/browse/HBASE-16446) | append\_peer\_tableCFs failed when there already have this table's partial cfs in the peer | Minor | Replication |
| [HBASE-16454](https://issues.apache.org/jira/browse/HBASE-16454) | Compactor's shipping logic decision should be based on the current store's block size | Minor | . |
| [HBASE-16444](https://issues.apache.org/jira/browse/HBASE-16444) | CellUtil#estimatedSerializedSizeOfKey() should consider KEY\_INFRASTRUCTURE\_SIZE | Minor | . |
| [HBASE-7621](https://issues.apache.org/jira/browse/HBASE-7621) | REST client (RemoteHTable) doesn't support binary row keys | Major | REST |
| [HBASE-16430](https://issues.apache.org/jira/browse/HBASE-16430) | Fix RegionServer Group's bug when moving multiple tables | Major | master |
| [HBASE-16429](https://issues.apache.org/jira/browse/HBASE-16429) | FSHLog: deadlock if rollWriter called when ring buffer filled with appends | Critical | . |
| [HBASE-16384](https://issues.apache.org/jira/browse/HBASE-16384) | Update report-flakies.py script to allow specifying a list of build ids to be excluded | Major | . |
| [HBASE-15635](https://issues.apache.org/jira/browse/HBASE-15635) | Mean age of Blocks in cache (seconds) on webUI should be greater than zero | Major | . |
| [HBASE-16341](https://issues.apache.org/jira/browse/HBASE-16341) | Missing bit on "Regression: Random Read/WorkloadC slower in 1.x than 0.98" | Major | rpc |
| [HBASE-16267](https://issues.apache.org/jira/browse/HBASE-16267) | Remove commons-httpclient dependency from hbase-rest module | Critical | . |
| [HBASE-16389](https://issues.apache.org/jira/browse/HBASE-16389) | Thread leak in CoprocessorHost#getTable(TableName) API | Major | . |
| [HBASE-16363](https://issues.apache.org/jira/browse/HBASE-16363) | Correct javadoc for qualifier length and value length in Cell interface | Minor | documentation |
| [HBASE-16368](https://issues.apache.org/jira/browse/HBASE-16368) | test\*WhenRegionMove in TestPartialResultsFromClientSide is flaky | Major | Scanners |
| [HBASE-16310](https://issues.apache.org/jira/browse/HBASE-16310) | Revisit the logic of filterRowKey for Filters | Major | . |
| [HBASE-16361](https://issues.apache.org/jira/browse/HBASE-16361) | Revert of HBASE-16317, "revert all ESAPI..." broke TestLogLevel | Major | dependencies, UI |
| [HBASE-16367](https://issues.apache.org/jira/browse/HBASE-16367) | Race between master and region server initialization may lead to premature server abort | Major | . |
| [HBASE-16303](https://issues.apache.org/jira/browse/HBASE-16303) | FilterList with MUST\_PASS\_ONE optimization | Major | Filters |
| [HBASE-15866](https://issues.apache.org/jira/browse/HBASE-15866) | Split hbase.rpc.timeout into \*.read.timeout and \*.write.timeout | Major | . |
| [HBASE-16362](https://issues.apache.org/jira/browse/HBASE-16362) | Mob compaction does not set cacheBlocks to false when creating StoreScanner | Major | Compaction, regionserver |
| [HBASE-16359](https://issues.apache.org/jira/browse/HBASE-16359) | NullPointerException in RSRpcServices.openRegion() | Major | . |
| [HBASE-15461](https://issues.apache.org/jira/browse/HBASE-15461) | ref guide has bad links to blogs originally posted on cloudera website | Major | website |
| [HBASE-15574](https://issues.apache.org/jira/browse/HBASE-15574) | Minor typo on HRegionServerCommandLine.java | Trivial | . |
| [HBASE-16350](https://issues.apache.org/jira/browse/HBASE-16350) | Undo server abort from HBASE-14968 | Major | . |
| [HBASE-16271](https://issues.apache.org/jira/browse/HBASE-16271) | Fix logging and re-run the test in IntegrationTestBulkLoad | Major | . |
| [HBASE-16347](https://issues.apache.org/jira/browse/HBASE-16347) | Unevaluated expressions in book | Major | documentation, website |
| [HBASE-16301](https://issues.apache.org/jira/browse/HBASE-16301) | Trigger flush without waiting when compaction is disabled on a table | Minor | . |
| [HBASE-16319](https://issues.apache.org/jira/browse/HBASE-16319) | Fix TestCacheOnWrite after HBASE-16288 | Trivial | . |
| [HBASE-16315](https://issues.apache.org/jira/browse/HBASE-16315) | RegionSizeCalculator prints region names as binary without escapes | Trivial | . |
| [HBASE-16284](https://issues.apache.org/jira/browse/HBASE-16284) | Unauthorized client can shutdown the cluster | Major | . |
| [HBASE-16296](https://issues.apache.org/jira/browse/HBASE-16296) | Reverse scan performance degrades when using filter lists | Major | Filters |
| [HBASE-16288](https://issues.apache.org/jira/browse/HBASE-16288) | HFile intermediate block level indexes might recurse forever creating multi TB files | Critical | HFile |
| [HBASE-16234](https://issues.apache.org/jira/browse/HBASE-16234) | Expect and handle nulls when assigning replicas | Major | Region Assignment |
| [HBASE-16306](https://issues.apache.org/jira/browse/HBASE-16306) | Add specific imports to avoid namespace clash in defaultSource.scala | Minor | . |
| [HBASE-16300](https://issues.apache.org/jira/browse/HBASE-16300) | LruBlockCache.CACHE\_FIXED\_OVERHEAD should calculate LruBlockCache size correctly | Major | . |
| [HBASE-16289](https://issues.apache.org/jira/browse/HBASE-16289) | AsyncProcess stuck messages need to print region/server | Critical | Operability |
| [HBASE-16096](https://issues.apache.org/jira/browse/HBASE-16096) | Replication keeps accumulating znodes | Major | Replication |
| [HBASE-16293](https://issues.apache.org/jira/browse/HBASE-16293) | TestSnapshotFromMaster#testSnapshotHFileArchiving flakey | Major | test |
| [HBASE-16281](https://issues.apache.org/jira/browse/HBASE-16281) | TestMasterReplication is flaky | Major | . |
| [HBASE-16221](https://issues.apache.org/jira/browse/HBASE-16221) | Thrift server drops connection on long scans | Major | Thrift |
| [HBASE-16272](https://issues.apache.org/jira/browse/HBASE-16272) | Overflow in ServerName's compareTo method | Major | hbase |
| [HBASE-16244](https://issues.apache.org/jira/browse/HBASE-16244) | LocalHBaseCluster start timeout should be configurable | Major | hbase |
| [HBASE-16238](https://issues.apache.org/jira/browse/HBASE-16238) | It's useless to catch SESSIONEXPIRED exception and retry in RecoverableZooKeeper | Minor | Zookeeper |
| [HBASE-16172](https://issues.apache.org/jira/browse/HBASE-16172) | Unify the retry logic in ScannerCallableWithReplicas and RpcRetryingCallerWithReadReplicas | Major | . |
| [HBASE-16110](https://issues.apache.org/jira/browse/HBASE-16110) | AsyncFS WAL doesn't work with Hadoop 2.8+ | Blocker | wal |
| [HBASE-16076](https://issues.apache.org/jira/browse/HBASE-16076) | Cannot configure split policy in HBase shell | Minor | documentation |
| [HBASE-16144](https://issues.apache.org/jira/browse/HBASE-16144) | Replication queue's lock will live forever if RS acquiring the lock has died prematurely | Major | . |
| [HBASE-16235](https://issues.apache.org/jira/browse/HBASE-16235) | TestSnapshotFromMaster#testSnapshotHFileArchiving will fail if there are too many hfiles | Trivial | . |
| [HBASE-16183](https://issues.apache.org/jira/browse/HBASE-16183) | Correct errors in example programs of coprocessor in Ref Guide | Minor | documentation |
| [HBASE-16095](https://issues.apache.org/jira/browse/HBASE-16095) | Add priority to TableDescriptor and priority region open thread pool | Major | . |
| [HBASE-16227](https://issues.apache.org/jira/browse/HBASE-16227) | [Shell] Column value formatter not working in scans | Major | . |
| [HBASE-16211](https://issues.apache.org/jira/browse/HBASE-16211) | JMXCacheBuster restarting the metrics system might cause tests to hang | Major | . |
| [HBASE-16150](https://issues.apache.org/jira/browse/HBASE-16150) | Remove ConcurrentIndex | Major | . |
| [HBASE-16207](https://issues.apache.org/jira/browse/HBASE-16207) | can't restore snapshot without "Admin" permission | Major | master, snapshots |
| [HBASE-16184](https://issues.apache.org/jira/browse/HBASE-16184) | Shell test fails due to rLoadSink being nil | Major | . |
| [HBASE-16055](https://issues.apache.org/jira/browse/HBASE-16055) | PutSortReducer loses any Visibility/acl attribute set on the Puts | Critical | security |
| [HBASE-16081](https://issues.apache.org/jira/browse/HBASE-16081) | Replication remove\_peer gets stuck and blocks WAL rolling | Blocker | regionserver, Replication |
| [HBASE-16044](https://issues.apache.org/jira/browse/HBASE-16044) | Fix 'hbase shell' output parsing in graceful\_stop.sh | Critical | scripts, shell |
| [HBASE-16160](https://issues.apache.org/jira/browse/HBASE-16160) | Get the UnsupportedOperationException when using delegation token with encryption | Blocker | . |
| [HBASE-16074](https://issues.apache.org/jira/browse/HBASE-16074) | ITBLL fails, reports lost big or tiny families | Blocker | integration tests |
| [HBASE-16201](https://issues.apache.org/jira/browse/HBASE-16201) | NPE in RpcServer causing intermittent UT failure of TestMasterReplication#testHFileCyclicReplication | Major | . |
| [HBASE-16171](https://issues.apache.org/jira/browse/HBASE-16171) | Fix the potential problems in TestHCM.testConnectionCloseAllowsInterrupt | Major | . |
| [HBASE-15925](https://issues.apache.org/jira/browse/HBASE-15925) | compat-module maven variable not evaluated | Blocker | build |
| [HBASE-16187](https://issues.apache.org/jira/browse/HBASE-16187) | Fix typo in blog post for metrics2 | Major | website |
| [HBASE-16190](https://issues.apache.org/jira/browse/HBASE-16190) | IntegrationTestDDLMasterFailover failed with IllegalArgumentException: n must be positive | Minor | . |
| [HBASE-16182](https://issues.apache.org/jira/browse/HBASE-16182) | Increase IntegrationTestRpcClient timeout | Major | . |
| [HBASE-16157](https://issues.apache.org/jira/browse/HBASE-16157) | The incorrect block cache count and size are caused by removing duplicate block key in the LruBlockCache | Trivial | . |
| [HBASE-16177](https://issues.apache.org/jira/browse/HBASE-16177) | In dev mode thrift server can't be run | Major | . |
| [HBASE-16091](https://issues.apache.org/jira/browse/HBASE-16091) | Canary takes lot more time when there are delete markers in the table | Major | canary |
| [HBASE-16132](https://issues.apache.org/jira/browse/HBASE-16132) | Scan does not return all the result when regionserver is busy | Major | Client |
| [HBASE-16135](https://issues.apache.org/jira/browse/HBASE-16135) | PeerClusterZnode under rs of removed peer may never be deleted | Major | Replication |
| [HBASE-15844](https://issues.apache.org/jira/browse/HBASE-15844) | We should respect hfile.block.index.cacheonwrite when write intermediate index Block | Major | . |
| [HBASE-16159](https://issues.apache.org/jira/browse/HBASE-16159) | OutOfMemory exception when using AsyncRpcClient with encryption to read rpc response | Major | . |
| [HBASE-16125](https://issues.apache.org/jira/browse/HBASE-16125) | RegionMover uses hardcoded, Unix-style tmp folder - breaks Windows | Major | . |
| [HBASE-16133](https://issues.apache.org/jira/browse/HBASE-16133) | RSGroupBasedLoadBalancer.retainAssignment() might miss a region | Major | . |
| [HBASE-16129](https://issues.apache.org/jira/browse/HBASE-16129) | check\_compatibility.sh is broken when using Java API Compliance Checker v1.7 | Major | test |
| [HBASE-15976](https://issues.apache.org/jira/browse/HBASE-15976) | RegionServerMetricsWrapperRunnable will be failure when disable blockcache. | Major | . |
| [HBASE-16122](https://issues.apache.org/jira/browse/HBASE-16122) | PerformanceEvaluation should provide user friendly hint when client threads argument is missing | Minor | . |
| [HBASE-16069](https://issues.apache.org/jira/browse/HBASE-16069) | Typo "trapsparently" in item 3 of chapter 87.2 of Reference Guide | Minor | documentation |
| [HBASE-16109](https://issues.apache.org/jira/browse/HBASE-16109) | Add Interface audience annotation to a few classes | Minor | . |
| [HBASE-16111](https://issues.apache.org/jira/browse/HBASE-16111) | Truncate preserve shell command is broken | Major | shell |
| [HBASE-16103](https://issues.apache.org/jira/browse/HBASE-16103) | Procedure v2 - TestCloneSnapshotProcedure relies on execution order | Minor | proc-v2, test |
| [HBASE-16040](https://issues.apache.org/jira/browse/HBASE-16040) | Remove configuration "hbase.replication" | Major | . |
| [HBASE-16070](https://issues.apache.org/jira/browse/HBASE-16070) | Mapreduce Serialization classes do not have Interface audience | Major | . |
| [HBASE-16012](https://issues.apache.org/jira/browse/HBASE-16012) | Major compaction can't work due to obsolete scanner read point in RegionServer | Major | Compaction, Scanners |
| [HBASE-16062](https://issues.apache.org/jira/browse/HBASE-16062) | Improper error handling in WAL Reader/Writer creation | Major | . |
| [HBASE-16032](https://issues.apache.org/jira/browse/HBASE-16032) | Possible memory leak in StoreScanner | Major | . |
| [HBASE-16035](https://issues.apache.org/jira/browse/HBASE-16035) | Nested AutoCloseables might not all get closed | Major | . |
| [HBASE-15783](https://issues.apache.org/jira/browse/HBASE-15783) | AccessControlConstants#OP\_ATTRIBUTE\_ACL\_STRATEGY\_CELL\_FIRST not used any more. | Major | . |
| [HBASE-16059](https://issues.apache.org/jira/browse/HBASE-16059) | Region normalizer fails to trigger merge action where one of the regions is empty | Major | master |
| [HBASE-14485](https://issues.apache.org/jira/browse/HBASE-14485) | ConnectionImplementation leaks on construction failure | Major | Client |
| [HBASE-16054](https://issues.apache.org/jira/browse/HBASE-16054) | OutOfMemory exception when using AsyncRpcClient with encryption | Major | . |
| [HBASE-16066](https://issues.apache.org/jira/browse/HBASE-16066) | Resolve RpC\_REPEATED\_CONDITIONAL\_TEST findbugs warnings in HMaster | Major | . |
| [HBASE-16058](https://issues.apache.org/jira/browse/HBASE-16058) | TestHRegion fails on 1.4 builds | Major | test |
| [HBASE-15467](https://issues.apache.org/jira/browse/HBASE-15467) | Remove 1.x/2.0 TableDescriptor incompatibility | Major | master, regionserver |
| [HBASE-16061](https://issues.apache.org/jira/browse/HBASE-16061) | Allow logging to a buffered console | Major | . |
| [HBASE-16053](https://issues.apache.org/jira/browse/HBASE-16053) | Master code is not setting the table in ENABLING state in create table | Major | . |
| [HBASE-16045](https://issues.apache.org/jira/browse/HBASE-16045) | endtime argument for VerifyReplication was incorrectly specified in usage | Major | . |
| [HBASE-15977](https://issues.apache.org/jira/browse/HBASE-15977) | Failed variable substitution on home page | Major | website |
| [HBASE-16047](https://issues.apache.org/jira/browse/HBASE-16047) | TestFastFail is broken again | Major | test |
| [HBASE-15908](https://issues.apache.org/jira/browse/HBASE-15908) | Checksum verification is broken due to incorrect passing of ByteBuffers in DataChecksum | Blocker | HFile |
| [HBASE-16031](https://issues.apache.org/jira/browse/HBASE-16031) | Documents about "hbase.replication" default value seems wrong | Major | documentation |
| [HBASE-16017](https://issues.apache.org/jira/browse/HBASE-16017) | HBase TableOutputFormat has connection leak in getRecordWriter | Major | mapreduce |
| [HBASE-15746](https://issues.apache.org/jira/browse/HBASE-15746) | Remove extra RegionCoprocessor preClose() in RSRpcServices#closeRegion | Minor | Coprocessors, regionserver |
| [HBASE-16021](https://issues.apache.org/jira/browse/HBASE-16021) | graceful\_stop.sh: Wrap variables in double quote to avoid "[: too many arguments" error | Minor | scripts |
| [HBASE-16016](https://issues.apache.org/jira/browse/HBASE-16016) | AssignmentManager#waitForAssignment could have unexpected negative deadline | Major | . |
| [HBASE-16007](https://issues.apache.org/jira/browse/HBASE-16007) | Job's Configuration should be passed to TableMapReduceUtil#addDependencyJars() in WALPlayer | Major | . |
| [HBASE-14644](https://issues.apache.org/jira/browse/HBASE-14644) | Region in transition metric is broken | Major | . |
| [HBASE-15946](https://issues.apache.org/jira/browse/HBASE-15946) | Eliminate possible security concerns in RS web UI's store file metrics | Major | . |
| [HBASE-15990](https://issues.apache.org/jira/browse/HBASE-15990) | The priority value of subsequent coprocessors in the Coprocessor.Priority.SYSTEM list are not incremented by one | Minor | . |
| [HBASE-15952](https://issues.apache.org/jira/browse/HBASE-15952) | Bulk load data replication is not working when RS user does not have permission on hfile-refs node | Major | Replication |
| [HBASE-15975](https://issues.apache.org/jira/browse/HBASE-15975) | logic in TestHTableDescriptor#testAddCoprocessorWithSpecStr is wrong | Trivial | test |
| [HBASE-15959](https://issues.apache.org/jira/browse/HBASE-15959) | Fix flaky test TestRegionServerMetrics.testMobMetrics | Major | . |
| [HBASE-15957](https://issues.apache.org/jira/browse/HBASE-15957) | RpcClientImpl.close never ends in some circumstances | Major | Client, rpc |
| [HBASE-15803](https://issues.apache.org/jira/browse/HBASE-15803) | ZooKeeperWatcher's constructor can leak a ZooKeeper instance with throwing ZooKeeperConnectionException when canCreateBaseZNode is true | Minor | . |
| [HBASE-15698](https://issues.apache.org/jira/browse/HBASE-15698) | Increment TimeRange not serialized to server | Blocker | . |
| [HBASE-15965](https://issues.apache.org/jira/browse/HBASE-15965) | Shell test changes. Use @shell.command instead directly calling functions in admin.rb and other libraries. | Major | . |
| [HBASE-15954](https://issues.apache.org/jira/browse/HBASE-15954) | REST server should log requests with TRACE instead of DEBUG | Major | . |
| [HBASE-15889](https://issues.apache.org/jira/browse/HBASE-15889) | String case conversions are locale-sensitive, used without locale | Minor | localization |
| [HBASE-15955](https://issues.apache.org/jira/browse/HBASE-15955) | Disable action in CatalogJanitor#setEnabled should wait for active cleanup scan to finish | Major | master |
| [HBASE-15929](https://issues.apache.org/jira/browse/HBASE-15929) | There are two classes with name TestRegionServerMetrics | Major | . |
| [HBASE-15845](https://issues.apache.org/jira/browse/HBASE-15845) | Shell Cleanup : move formatter to commands.rb; move one of the two hbase.rb to hbase\_constants.rb | Minor | shell |
| [HBASE-15933](https://issues.apache.org/jira/browse/HBASE-15933) | NullPointerException may be thrown from SimpleRegionNormalizer#getRegionSize() | Major | . |
| [HBASE-15938](https://issues.apache.org/jira/browse/HBASE-15938) | submit-patch.py: Don't crash if there are tests with same name. Refactor: Split out html template to separate file. | Major | . |
| [HBASE-15944](https://issues.apache.org/jira/browse/HBASE-15944) | Spark test flooding mvn output. Redirect test logs to file. | Major | . |
| [HBASE-15858](https://issues.apache.org/jira/browse/HBASE-15858) | Some region server group shell commands don't work | Major | . |
| [HBASE-15932](https://issues.apache.org/jira/browse/HBASE-15932) | Shell test fails due to uninitialized constant | Major | . |
| [HBASE-15907](https://issues.apache.org/jira/browse/HBASE-15907) | Missing documentation of create table split options | Major | documentation |
| [HBASE-15918](https://issues.apache.org/jira/browse/HBASE-15918) | Cleanup excludes/includes file after use in hbase-personality.sh to avoid asf license error. | Major | . |
| [HBASE-15897](https://issues.apache.org/jira/browse/HBASE-15897) | Fix a wrong comment about QOS order | Trivial | . |
| [HBASE-15909](https://issues.apache.org/jira/browse/HBASE-15909) | Use Yetus' patch naming rules in submit-patch.py | Major | . |
| [HBASE-15912](https://issues.apache.org/jira/browse/HBASE-15912) | REST module has 2 extant results in findbugs | Major | . |
| [HBASE-15891](https://issues.apache.org/jira/browse/HBASE-15891) | Closeable resources potentially not getting closed if exception is thrown | Minor | . |
| [HBASE-15693](https://issues.apache.org/jira/browse/HBASE-15693) | Reconsider the ImportOrder rule of checkstyle | Major | build |
| [HBASE-11625](https://issues.apache.org/jira/browse/HBASE-11625) | Reading datablock throws "Invalid HFile block magic" and can not switch to hdfs checksum | Major | HFile |
| [HBASE-15830](https://issues.apache.org/jira/browse/HBASE-15830) | Sasl encryption doesn't work with AsyncRpcChannelImpl | Major | . |
| [HBASE-15884](https://issues.apache.org/jira/browse/HBASE-15884) | NPE in StoreFileScanner#skipKVsNewerThanReadpoint during reverse scan | Major | Scanners |
| [HBASE-15880](https://issues.apache.org/jira/browse/HBASE-15880) | RpcClientImpl#tracedWriteRequest incorrectly closes HTrace span | Major | tracing |
| [HBASE-14818](https://issues.apache.org/jira/browse/HBASE-14818) | user\_permission does not list namespace permissions | Minor | hbase |
| [HBASE-15856](https://issues.apache.org/jira/browse/HBASE-15856) | Cached Connection instances can wind up with addresses never resolved | Critical | Client |
| [HBASE-15863](https://issues.apache.org/jira/browse/HBASE-15863) | Typo in Put.java class documentation | Trivial | documentation, java |
| [HBASE-15465](https://issues.apache.org/jira/browse/HBASE-15465) | userPermission returned by getUserPermission() for the selected namespace does not have namespace set | Minor | Protobufs |
| [HBASE-15617](https://issues.apache.org/jira/browse/HBASE-15617) | Canary in regionserver mode might not enumerate all regionservers | Minor | . |
| [HBASE-15850](https://issues.apache.org/jira/browse/HBASE-15850) | Localize the configuration change in testCheckTableLocks to reduce flakiness of TestHBaseFsck test suite | Major | hbck |
| [HBASE-15841](https://issues.apache.org/jira/browse/HBASE-15841) | Performance Evaluation tool total rows may not be set correctly | Minor | . |
| [HBASE-15824](https://issues.apache.org/jira/browse/HBASE-15824) | LocalHBaseCluster gets bind exception in master info port | Major | . |
| [HBASE-15784](https://issues.apache.org/jira/browse/HBASE-15784) | Misuse core/maxPoolSize of LinkedBlockingQueue in ThreadPoolExecutor | Major | Client, Replication, Thrift |
| [HBASE-15834](https://issues.apache.org/jira/browse/HBASE-15834) | Correct Bloom filter documentation in section 96.4 of Reference Guide | Minor | documentation |
| [HBASE-15769](https://issues.apache.org/jira/browse/HBASE-15769) | Perform validation on cluster key for add\_peer | Minor | . |
| [HBASE-15848](https://issues.apache.org/jira/browse/HBASE-15848) | Fix possible null point dereference in RSGroupBasedLoadBalancer#getMisplacedRegions() | Trivial | regionserver |
| [HBASE-15840](https://issues.apache.org/jira/browse/HBASE-15840) | WAL.proto compilation broken for cpp | Major | . |
| [HBASE-15725](https://issues.apache.org/jira/browse/HBASE-15725) | make\_patch.sh should add the branch name when -b is passed. | Major | tooling |
| [HBASE-15828](https://issues.apache.org/jira/browse/HBASE-15828) | fix extant findbug | Major | findbugs |
| [HBASE-15615](https://issues.apache.org/jira/browse/HBASE-15615) | Wrong sleep time when RegionServerCallable need retry | Major | Client |
| [HBASE-15811](https://issues.apache.org/jira/browse/HBASE-15811) | Batch Get after batch Put does not fetch all Cells | Blocker | Client |
| [HBASE-15742](https://issues.apache.org/jira/browse/HBASE-15742) | Reduce allocation of objects in metrics | Major | . |
| [HBASE-15799](https://issues.apache.org/jira/browse/HBASE-15799) | Two Shell 'close\_region' Example Syntaxes Don't Work | Minor | shell |
| [HBASE-15801](https://issues.apache.org/jira/browse/HBASE-15801) | Upgrade checkstyle for all branches | Major | build |
| [HBASE-15797](https://issues.apache.org/jira/browse/HBASE-15797) | TestIPCUtil fails after HBASE-15795 | Major | . |
| [HBASE-15236](https://issues.apache.org/jira/browse/HBASE-15236) | Inconsistent cell reads over multiple bulk-loaded HFiles | Major | . |
| [HBASE-15807](https://issues.apache.org/jira/browse/HBASE-15807) | Update report-flakies.py to look for "FAILED" status in test report | Minor | . |
| [HBASE-15738](https://issues.apache.org/jira/browse/HBASE-15738) | Ensure artifacts in project dist area include required md5 file | Blocker | build, community |
| [HBASE-15796](https://issues.apache.org/jira/browse/HBASE-15796) | TestMetaCache fails after HBASE-15745 | Major | . |
| [HBASE-15781](https://issues.apache.org/jira/browse/HBASE-15781) | Remove unused TableEventHandler and TotesHRegionInfo | Trivial | master |
| [HBASE-15782](https://issues.apache.org/jira/browse/HBASE-15782) | TestShell fails due to some moved types | Major | . |
| [HBASE-15669](https://issues.apache.org/jira/browse/HBASE-15669) | HFile size is not considered correctly in a replication request | Major | Replication |
| [HBASE-15292](https://issues.apache.org/jira/browse/HBASE-15292) | Refined ZooKeeperWatcher to prevent ZooKeeper's callback while construction | Minor | Zookeeper |
| [HBASE-15563](https://issues.apache.org/jira/browse/HBASE-15563) | 'counter' may overflow in BoundedGroupingStrategy | Minor | wal |
| [HBASE-15755](https://issues.apache.org/jira/browse/HBASE-15755) | SnapshotDescriptionUtils and SnapshotTestingUtils do not have any Interface audience marked | Major | . |
| [HBASE-15741](https://issues.apache.org/jira/browse/HBASE-15741) | Provide backward compatibility for HBase coprocessor service names | Blocker | Coprocessors |
| [HBASE-15613](https://issues.apache.org/jira/browse/HBASE-15613) | TestNamespaceCommand times out | Major | . |
| [HBASE-15528](https://issues.apache.org/jira/browse/HBASE-15528) | Clean up outdated entries in hbase-default.xml | Minor | . |
| [HBASE-15752](https://issues.apache.org/jira/browse/HBASE-15752) | ClassNotFoundException is encountered when custom WAL codec is not found in WALPlayer job | Major | . |
| [HBASE-15714](https://issues.apache.org/jira/browse/HBASE-15714) | We are calling checkRow() twice in doMiniBatchMutation() | Major | regionserver |
| [HBASE-15703](https://issues.apache.org/jira/browse/HBASE-15703) | Deadline scheduler needs to return to the client info about skipped calls, not just drop them | Critical | IPC/RPC |
| [HBASE-15357](https://issues.apache.org/jira/browse/HBASE-15357) | TableInputFormatBase getSplitKey does not handle signed bytes correctly | Major | mapreduce |
| [HBASE-15711](https://issues.apache.org/jira/browse/HBASE-15711) | Add client side property to allow logging details for batch errors | Major | . |
| [HBASE-15732](https://issues.apache.org/jira/browse/HBASE-15732) | hbase-rsgroups should be in the assembly | Major | . |
| [HBASE-15676](https://issues.apache.org/jira/browse/HBASE-15676) | FuzzyRowFilter fails and matches all the rows in the table if the mask consists of all 0s | Major | Filters |
| [HBASE-15697](https://issues.apache.org/jira/browse/HBASE-15697) | Excessive TestHRegion running time on branch-1 | Major | . |
| [HBASE-15685](https://issues.apache.org/jira/browse/HBASE-15685) | Typo in REST documentation | Minor | documentation |
| [HBASE-15708](https://issues.apache.org/jira/browse/HBASE-15708) | Docker for dev-support scripts | Major | . |
| [HBASE-15707](https://issues.apache.org/jira/browse/HBASE-15707) | ImportTSV bulk output does not support tags with hfile.format.version=3 | Major | mapreduce |
| [HBASE-15645](https://issues.apache.org/jira/browse/HBASE-15645) | hbase.rpc.timeout is not used in operations of HTable | Critical | . |
| [HBASE-15634](https://issues.apache.org/jira/browse/HBASE-15634) | TestDateTieredCompactionPolicy#negativeForMajor is flaky | Major | test |
| [HBASE-15710](https://issues.apache.org/jira/browse/HBASE-15710) | Include issue servers information in RetriesExhaustedWithDetailsException message | Minor | . |
| [HBASE-14252](https://issues.apache.org/jira/browse/HBASE-14252) | RegionServers fail to start when setting hbase.ipc.server.callqueue.scan.ratio to 0 | Major | regionserver |
| [HBASE-15699](https://issues.apache.org/jira/browse/HBASE-15699) | Can not sync AsyncFSWAL if no edit is appended | Major | wal |
| [HBASE-15360](https://issues.apache.org/jira/browse/HBASE-15360) | Fix flaky TestSimpleRpcScheduler | Critical | test |
| [HBASE-15670](https://issues.apache.org/jira/browse/HBASE-15670) | Add missing Snapshot.proto to the maven profile for compiling protobuf | Major | . |
| [HBASE-15674](https://issues.apache.org/jira/browse/HBASE-15674) | HRegionLocator#getAllRegionLocations should put the results in cache | Major | . |
| [HBASE-15672](https://issues.apache.org/jira/browse/HBASE-15672) | hadoop.hbase.security.visibility.TestVisibilityLabelsWithDeletes fails | Major | test |
| [HBASE-15673](https://issues.apache.org/jira/browse/HBASE-15673) | [PE tool] Fix latency metrics for multiGet | Major | Performance |
| [HBASE-14898](https://issues.apache.org/jira/browse/HBASE-14898) | Correct Bloom filter documentation in the book | Minor | . |
| [HBASE-15664](https://issues.apache.org/jira/browse/HBASE-15664) | Use Long.MAX\_VALUE instead of HConstants.FOREVER in CompactionPolicy | Major | Compaction |
| [HBASE-15668](https://issues.apache.org/jira/browse/HBASE-15668) | HFileReplicator$Copier fails to replicate other hfiles in the request when a hfile in not found in FS anywhere | Trivial | Replication |
| [HBASE-15287](https://issues.apache.org/jira/browse/HBASE-15287) | mapreduce.RowCounter returns incorrect result with binary row key inputs | Major | mapreduce, util |
| [HBASE-15187](https://issues.apache.org/jira/browse/HBASE-15187) | Integrate CSRF prevention filter to REST gateway | Major | . |
| [HBASE-15650](https://issues.apache.org/jira/browse/HBASE-15650) | Remove TimeRangeTracker as point of contention when many threads reading a StoreFile | Major | Performance |
| [HBASE-15622](https://issues.apache.org/jira/browse/HBASE-15622) | Superusers does not consider the keytab credentials | Critical | security |
| [HBASE-15405](https://issues.apache.org/jira/browse/HBASE-15405) | Synchronize final results logging single thread in PE, fix wrong defaults in help message | Minor | Performance |
| [HBASE-15504](https://issues.apache.org/jira/browse/HBASE-15504) | Fix Balancer in 1.3 not moving regions off overloaded regionserver | Major | . |
| [HBASE-15637](https://issues.apache.org/jira/browse/HBASE-15637) | TSHA Thrift-2 server should allow limiting call queue size | Major | Thrift |
| [HBASE-15639](https://issues.apache.org/jira/browse/HBASE-15639) | Unguarded access to stackIndexes in Procedure#toStringDetails() | Minor | . |
| [HBASE-15636](https://issues.apache.org/jira/browse/HBASE-15636) | hard coded wait time out value in HBaseTestingUtility#waitUntilAllRegionsAssigned might cause test failure | Minor | integration tests, test |
| [HBASE-15621](https://issues.apache.org/jira/browse/HBASE-15621) | Suppress Hbase SnapshotHFile cleaner error messages when a snaphot is going on | Minor | snapshots |
| [HBASE-15627](https://issues.apache.org/jira/browse/HBASE-15627) | Miss space and closing quote in AccessController#checkSystemOrSuperUser | Minor | security |
| [HBASE-15093](https://issues.apache.org/jira/browse/HBASE-15093) | Replication can report incorrect size of log queue for the global source when multiwal is enabled | Minor | Replication |
| [HBASE-15591](https://issues.apache.org/jira/browse/HBASE-15591) | ServerCrashProcedure not yielding | Major | . |
| [HBASE-15623](https://issues.apache.org/jira/browse/HBASE-15623) | Update refguide to change hadoop \<= 2.3.x from NT to X for hbase-1.2.x | Major | documentation |
| [HBASE-15587](https://issues.apache.org/jira/browse/HBASE-15587) | FSTableDescriptors.getDescriptor() logs stack trace erronously | Major | . |
| [HBASE-15485](https://issues.apache.org/jira/browse/HBASE-15485) | Filter.reset() should not be called between batches | Major | . |
| [HBASE-15578](https://issues.apache.org/jira/browse/HBASE-15578) | Handle HBASE-15234 for ReplicationHFileCleaner | Major | Replication |
| [HBASE-15582](https://issues.apache.org/jira/browse/HBASE-15582) | SnapshotManifestV1 too verbose when there are no regions | Trivial | master, snapshots |
| [HBASE-15424](https://issues.apache.org/jira/browse/HBASE-15424) | Add bulk load hfile-refs for replication in ZK after the event is appended in the WAL | Minor | Replication |
| [HBASE-15234](https://issues.apache.org/jira/browse/HBASE-15234) | ReplicationLogCleaner can abort due to transient ZK issues | Critical | master, Replication |
| [HBASE-15567](https://issues.apache.org/jira/browse/HBASE-15567) | TestReplicationShell broken by recent replication changes | Minor | Replication, shell |
| [HBASE-15324](https://issues.apache.org/jira/browse/HBASE-15324) | Jitter may cause desiredMaxFileSize overflow in ConstantSizeRegionSplitPolicy and trigger unexpected split | Major | . |
| [HBASE-15566](https://issues.apache.org/jira/browse/HBASE-15566) | Add timeouts on TestMobFlushSnapshotFromClient and TestRegionMergeTransactionOnCluster | Major | . |
| [HBASE-15559](https://issues.apache.org/jira/browse/HBASE-15559) | BaseMasterAndRegionObserver doesn't implement all the methods | Major | . |
| [HBASE-15327](https://issues.apache.org/jira/browse/HBASE-15327) | Canary will always invoke admin.balancer() in each sniffing period when writeSniffing is enabled | Minor | canary |
| [HBASE-15295](https://issues.apache.org/jira/browse/HBASE-15295) | MutateTableAccess.multiMutate() does not get high priority causing a deadlock | Major | . |
| [HBASE-15515](https://issues.apache.org/jira/browse/HBASE-15515) | Improve LocalityBasedCandidateGenerator in Balancer | Minor | . |
| [HBASE-14256](https://issues.apache.org/jira/browse/HBASE-14256) | Flush task message may be confusing when region is recovered | Major | regionserver |
| [HBASE-15520](https://issues.apache.org/jira/browse/HBASE-15520) | Fix broken TestAsyncIPC | Major | . |
| [HBASE-15064](https://issues.apache.org/jira/browse/HBASE-15064) | BufferUnderflowException after last Cell fetched from an HFile Block served from L2 offheap cache | Critical | io |
| [HBASE-15325](https://issues.apache.org/jira/browse/HBASE-15325) | ResultScanner allowing partial result will miss the rest of the row if the region is moved between two rpc requests | Critical | dataloss, Scanners |
| [HBASE-15433](https://issues.apache.org/jira/browse/HBASE-15433) | SnapshotManager#restoreSnapshot not update table and region count quota correctly when encountering exception | Major | snapshots |
| [HBASE-15441](https://issues.apache.org/jira/browse/HBASE-15441) | Fix WAL splitting when region has moved multiple times | Blocker | Recovery, wal |
| [HBASE-15430](https://issues.apache.org/jira/browse/HBASE-15430) | Failed taking snapshot - Manifest proto-message too large | Critical | snapshots |
| [HBASE-15463](https://issues.apache.org/jira/browse/HBASE-15463) | Region normalizer should check whether split/merge is enabled | Minor | . |
| [HBASE-15439](https://issues.apache.org/jira/browse/HBASE-15439) | getMaximumAllowedTimeBetweenRuns in ScheduledChore ignores the TimeUnit | Major | master, mob, regionserver |
| [HBASE-15379](https://issues.apache.org/jira/browse/HBASE-15379) | Fake cells created in read path not implementing SettableSequenceId | Major | . |
| [HBASE-15425](https://issues.apache.org/jira/browse/HBASE-15425) | Failing to write bulk load event marker in the WAL is ignored | Major | . |
| [HBASE-15378](https://issues.apache.org/jira/browse/HBASE-15378) | Scanner cannot handle heartbeat message with no results | Critical | dataloss, Scanners |
| [HBASE-15271](https://issues.apache.org/jira/browse/HBASE-15271) | Spark Bulk Load: Need to write HFiles to tmp location then rename to protect from Spark Executor Failures | Major | . |
| [HBASE-15364](https://issues.apache.org/jira/browse/HBASE-15364) | Fix unescaped \< characters in Javadoc | Major | API, documentation |
| [HBASE-15137](https://issues.apache.org/jira/browse/HBASE-15137) | CallTimeoutException and CallQueueTooBigException should trigger PFFE | Major | . |
| [HBASE-15393](https://issues.apache.org/jira/browse/HBASE-15393) | Enable table replication command will fail when parent znode is not default in peer cluster | Major | Replication |
| [HBASE-15397](https://issues.apache.org/jira/browse/HBASE-15397) | Create bulk load replication znode(hfile-refs) in ZK replication queue by default | Major | Replication |
| [HBASE-15329](https://issues.apache.org/jira/browse/HBASE-15329) | Cross-Site Scripting: Reflected in table.jsp | Minor | security, UI |
| [HBASE-15128](https://issues.apache.org/jira/browse/HBASE-15128) | Disable region splits and merges switch in master | Major | . |
| [HBASE-15358](https://issues.apache.org/jira/browse/HBASE-15358) | canEnforceTimeLimitFromScope should use timeScope instead of sizeScope | Major | Scanners |
| [HBASE-15332](https://issues.apache.org/jira/browse/HBASE-15332) | Document how to take advantage of HDFS-6133 in HBase | Major | documentation |
| [HBASE-15319](https://issues.apache.org/jira/browse/HBASE-15319) | clearJmxCache does not take effect actually | Major | metrics |
| [HBASE-15247](https://issues.apache.org/jira/browse/HBASE-15247) | InclusiveStopFilter does not respect reverse Filter property | Major | Filters |
| [HBASE-15285](https://issues.apache.org/jira/browse/HBASE-15285) | Forward-port respect for isReturnResult from HBASE-15095 | Major | Client |
| [HBASE-15298](https://issues.apache.org/jira/browse/HBASE-15298) | Fix missing or wrong asciidoc anchors in the reference guide | Minor | documentation |
| [HBASE-15259](https://issues.apache.org/jira/browse/HBASE-15259) | WALEdits under replay will also be replicated | Minor | . |
| [HBASE-15251](https://issues.apache.org/jira/browse/HBASE-15251) | During a cluster restart, Hmaster thinks it is a failover by mistake | Major | master |
| [HBASE-15289](https://issues.apache.org/jira/browse/HBASE-15289) | Add details about how to get usage instructions for Import and Export utilities | Major | documentation |
| [HBASE-13883](https://issues.apache.org/jira/browse/HBASE-13883) | Fix Memstore Flush section in HBase book | Major | documentation |
| [HBASE-15250](https://issues.apache.org/jira/browse/HBASE-15250) | Fix links that are currently redirected from old URLs | Major | documentation, website |
| [HBASE-15279](https://issues.apache.org/jira/browse/HBASE-15279) | OrderedBytes.isEncodedValue does not check for int8 and int16 types | Major | . |
| [HBASE-15276](https://issues.apache.org/jira/browse/HBASE-15276) | TestFlushSnapshotFromClient hung | Major | . |
| [HBASE-15198](https://issues.apache.org/jira/browse/HBASE-15198) | RPC client not using Codec and CellBlock for puts by default | Critical | . |
| [HBASE-15122](https://issues.apache.org/jira/browse/HBASE-15122) | Servlets generate XSS\_REQUEST\_PARAMETER\_TO\_SERVLET\_WRITER findbugs warnings | Critical | UI |
| [HBASE-15079](https://issues.apache.org/jira/browse/HBASE-15079) | TestMultiParallel.validateLoadedData AssertionError: null | Major | Client, flakey, test |
| [HBASE-13839](https://issues.apache.org/jira/browse/HBASE-13839) | Fix AssgnmentManagerTmpl.jamon issues (coloring, content etc.) | Major | master, UI |
| [HBASE-15252](https://issues.apache.org/jira/browse/HBASE-15252) | Data loss when replaying wal if HDFS timeout | Blocker | wal |
| [HBASE-15221](https://issues.apache.org/jira/browse/HBASE-15221) | HTableMultiplexer improvements (stale region locations and resource leaks) | Critical | Client |
| [HBASE-15253](https://issues.apache.org/jira/browse/HBASE-15253) | Small bug in CellUtil.matchingRow(Cell, byte[]) | Minor | . |
| [HBASE-14192](https://issues.apache.org/jira/browse/HBASE-14192) | Fix REST Cluster constructor with String List | Minor | REST |
| [HBASE-15216](https://issues.apache.org/jira/browse/HBASE-15216) | Canary does not accept config params from command line | Major | canary |
| [HBASE-15231](https://issues.apache.org/jira/browse/HBASE-15231) | Make TableState.State private | Major | API |
| [HBASE-15214](https://issues.apache.org/jira/browse/HBASE-15214) | Valid mutate Ops fail with RPC Codec in use and region moves across | Critical | . |
| [HBASE-14770](https://issues.apache.org/jira/browse/HBASE-14770) | RowCounter argument input parse error | Minor | mapreduce |
| [HBASE-15209](https://issues.apache.org/jira/browse/HBASE-15209) | disable table in HBaseTestingUtility.truncateTable | Minor | . |
| [HBASE-15218](https://issues.apache.org/jira/browse/HBASE-15218) | On RS crash and replay of WAL, loosing all Tags in Cells | Blocker | Recovery, regionserver, security |
| [HBASE-15200](https://issues.apache.org/jira/browse/HBASE-15200) | ZooKeeper znode ACL checks should only compare the shortname | Minor | security |
| [HBASE-15206](https://issues.apache.org/jira/browse/HBASE-15206) | Flakey testSplitDaughtersNotInMeta test | Minor | flakey |
| [HBASE-15196](https://issues.apache.org/jira/browse/HBASE-15196) | HBASE-15158 Preamble 2 of 2:Add Increment tests | Major | . |
| [HBASE-15186](https://issues.apache.org/jira/browse/HBASE-15186) | HBASE-15158 Preamble 1 of 2: fix findbugs, add javadoc, change Region#getReadpoint to #getReadPoint, and some util | Major | . |
| [HBASE-15190](https://issues.apache.org/jira/browse/HBASE-15190) | Monkey dies when running on shared cluster (gives up when can't kill the other fellows processes) | Major | integration tests |
| [HBASE-15195](https://issues.apache.org/jira/browse/HBASE-15195) | Don't run findbugs on hbase-it; it has nothing in src/main/java | Major | findbugs |
| [HBASE-14810](https://issues.apache.org/jira/browse/HBASE-14810) | Update Hadoop support description to explain "not tested" vs "not supported" | Critical | documentation |
| [HBASE-15019](https://issues.apache.org/jira/browse/HBASE-15019) | Replication stuck when HDFS is restarted | Major | Replication, wal |
| [HBASE-15173](https://issues.apache.org/jira/browse/HBASE-15173) | Execute mergeRegions RPC call as the request user | Minor | . |
| [HBASE-15146](https://issues.apache.org/jira/browse/HBASE-15146) | Don't block on Reader threads queueing to a scheduler queue | Blocker | . |
| [HBASE-15145](https://issues.apache.org/jira/browse/HBASE-15145) | HBCK and Replication should authenticate to zookepeer using server principal | Major | . |
| [HBASE-15164](https://issues.apache.org/jira/browse/HBASE-15164) | Fix broken links found via LinkLint | Major | documentation |
| [HBASE-15132](https://issues.apache.org/jira/browse/HBASE-15132) | Master region merge RPC should authorize user request | Major | . |
| [HBASE-13082](https://issues.apache.org/jira/browse/HBASE-13082) | Coarsen StoreScanner locks to RegionScanner | Major | Performance, Scanners |
| [HBASE-15148](https://issues.apache.org/jira/browse/HBASE-15148) | Resolve IS2\_INCONSISTENT\_SYNC findbugs warning in AuthenticationTokenSecretManager | Major | . |
| [HBASE-15133](https://issues.apache.org/jira/browse/HBASE-15133) | Data loss after compaction when a row has more than Integer.MAX\_VALUE columns | Major | Compaction |
| [HBASE-15152](https://issues.apache.org/jira/browse/HBASE-15152) | Automatically include prefix-tree module in MR jobs if present | Major | mapreduce |
| [HBASE-15147](https://issues.apache.org/jira/browse/HBASE-15147) | Shell should use Admin.listTableNames() instead of Admin.listTables() | Major | . |
| [HBASE-15126](https://issues.apache.org/jira/browse/HBASE-15126) | HBaseFsck's checkRegionBoundaries function sets incorrect 'storesFirstKey' | Major | hbck |
| [HBASE-15139](https://issues.apache.org/jira/browse/HBASE-15139) | Connection manager doesn't pass client metrics to RpcClient | Major | Client, metrics |
| [HBASE-15098](https://issues.apache.org/jira/browse/HBASE-15098) | Normalizer switch in configuration is not used | Blocker | master |
| [HBASE-15101](https://issues.apache.org/jira/browse/HBASE-15101) | Leaked References to StoreFile.Reader after HBASE-13082 | Critical | HFile, io |
| [HBASE-15102](https://issues.apache.org/jira/browse/HBASE-15102) | HeapMemoryTuner can "overtune" memstore size and suddenly drop it into blocking zone | Critical | regionserver |
| [HBASE-14771](https://issues.apache.org/jira/browse/HBASE-14771) | RpcServer#getRemoteAddress always returns null | Minor | IPC/RPC |
| [HBASE-14512](https://issues.apache.org/jira/browse/HBASE-14512) | Cache UGI groups | Major | Performance, security |
| [HBASE-15104](https://issues.apache.org/jira/browse/HBASE-15104) | Occasional failures due to NotServingRegionException in IT tests | Major | integration tests |
| [HBASE-15117](https://issues.apache.org/jira/browse/HBASE-15117) | Resolve ICAST findbugs warnings in current codes | Minor | . |
| [HBASE-15085](https://issues.apache.org/jira/browse/HBASE-15085) | IllegalStateException was thrown when scanning on bulkloaded HFiles | Critical | . |
| [HBASE-15083](https://issues.apache.org/jira/browse/HBASE-15083) | Gets from Multiactions are not counted in metrics for gets. | Major | . |
| [HBASE-15052](https://issues.apache.org/jira/browse/HBASE-15052) | Use EnvironmentEdgeManager in ReplicationSource | Trivial | Replication |
| [HBASE-15057](https://issues.apache.org/jira/browse/HBASE-15057) | local-master-backup.sh doesn't start HMaster correctly | Major | shell |
| [HBASE-15065](https://issues.apache.org/jira/browse/HBASE-15065) | SimpleRegionNormalizer should return multiple normalization plans in one run | Major | . |
| [HBASE-14975](https://issues.apache.org/jira/browse/HBASE-14975) | Don't color the total RIT line yellow if it's zero | Major | UI |
| [HBASE-15027](https://issues.apache.org/jira/browse/HBASE-15027) | Refactor the way the CompactedHFileDischarger threads are created | Major | . |
| [HBASE-15070](https://issues.apache.org/jira/browse/HBASE-15070) | DistributedHBaseCluster#restoreRegionServers() starts new RS process on master server | Minor | integration tests |
| [HBASE-14867](https://issues.apache.org/jira/browse/HBASE-14867) | SimpleRegionNormalizer needs to have better heuristics to trigger merge operation | Major | master |
| [HBASE-14987](https://issues.apache.org/jira/browse/HBASE-14987) | Compaction marker whose region name doesn't match current region's needs to be handled | Major | . |
| [HBASE-15063](https://issues.apache.org/jira/browse/HBASE-15063) | Bug in MultiByteBuf#toBytes | Critical | io, Performance |
| [HBASE-15050](https://issues.apache.org/jira/browse/HBASE-15050) | Block Ref counting does not work in Region Split cases. | Critical | . |
| [HBASE-15011](https://issues.apache.org/jira/browse/HBASE-15011) | turn off the jdk8 javadoc linter. :( | Blocker | build, documentation |
| [HBASE-15043](https://issues.apache.org/jira/browse/HBASE-15043) | region\_status.rb broken with TypeError: no public constructors for Java::OrgApacheHadoopHbaseClient::HBaseAdmin | Major | scripts |
| [HBASE-15026](https://issues.apache.org/jira/browse/HBASE-15026) | The default value of "hbase.regions.slop" in hbase-default.xml is obsolete | Minor | Balancer |
| [HBASE-15035](https://issues.apache.org/jira/browse/HBASE-15035) | bulkloading hfiles with tags that require splits do not preserve tags | Blocker | HFile |
| [HBASE-15039](https://issues.apache.org/jira/browse/HBASE-15039) | HMaster and RegionServers should try to refresh token keys from zk when facing InvalidToken | Major | . |
| [HBASE-14940](https://issues.apache.org/jira/browse/HBASE-14940) | Make our unsafe based ops more safe | Major | . |
| [HBASE-14717](https://issues.apache.org/jira/browse/HBASE-14717) | enable\_table\_replication command should only create specified table for a peer cluster | Major | Replication |
| [HBASE-15032](https://issues.apache.org/jira/browse/HBASE-15032) | hbase shell scan filter string assumes UTF-8 encoding | Major | shell |
| [HBASE-15034](https://issues.apache.org/jira/browse/HBASE-15034) | IntegrationTestDDLMasterFailover does not clean created namespaces | Minor | integration tests |
| [HBASE-15030](https://issues.apache.org/jira/browse/HBASE-15030) | Deadlock in master TableNamespaceManager while running IntegrationTestDDLMasterFailover | Major | proc-v2 |
| [HBASE-15021](https://issues.apache.org/jira/browse/HBASE-15021) | hadoopqa doing false positives | Major | . |
| [HBASE-15028](https://issues.apache.org/jira/browse/HBASE-15028) | Minor fix on RegionGroupingProvider | Minor | wal |
| [HBASE-14977](https://issues.apache.org/jira/browse/HBASE-14977) | ChoreService.shutdown may result in ConcurrentModificationException | Minor | util |
| [HBASE-15014](https://issues.apache.org/jira/browse/HBASE-15014) | Fix filterCellByStore in WALsplitter is awful for performance | Critical | MTTR, Recovery, wal |
| [HBASE-15001](https://issues.apache.org/jira/browse/HBASE-15001) | Thread Safety issues in ReplicationSinkManager and HBaseInterClusterReplicationEndpoint | Blocker | Replication |
| [HBASE-14654](https://issues.apache.org/jira/browse/HBASE-14654) | Reenable TestMultiParallel#testActiveThreadsCount | Major | test |
| [HBASE-15022](https://issues.apache.org/jira/browse/HBASE-15022) | undefined method \`getZooKeeperClusterKey' for Java::OrgApacheHadoopHbaseZookeeper::ZKUtil:Class | Major | shell |
| [HBASE-14991](https://issues.apache.org/jira/browse/HBASE-14991) | Fix the feature warning in scala code | Minor | . |
| [HBASE-15015](https://issues.apache.org/jira/browse/HBASE-15015) | Checktyle plugin shouldn't check Jamon-generated Java classes | Minor | build |
| [HBASE-14822](https://issues.apache.org/jira/browse/HBASE-14822) | Renewing leases of scanners doesn't work | Major | . |
| [HBASE-13907](https://issues.apache.org/jira/browse/HBASE-13907) | Document how to deploy a coprocessor | Major | documentation |
| [HBASE-14990](https://issues.apache.org/jira/browse/HBASE-14990) | Tests in BaseTestHBaseFsck are run by its subclasses redundantly | Minor | test |
| [HBASE-14999](https://issues.apache.org/jira/browse/HBASE-14999) | Remove ref to org.mortbay.log.Log | Minor | dependencies |
| [HBASE-15000](https://issues.apache.org/jira/browse/HBASE-15000) | Fix javadoc warn in LoadIncrementalHFiles | Trivial | . |
| [HBASE-14974](https://issues.apache.org/jira/browse/HBASE-14974) | Total number of Regions in Transition number on UI incorrect | Trivial | UI |
| [HBASE-14952](https://issues.apache.org/jira/browse/HBASE-14952) | hbase-assembly source artifact has some incorrect modules | Blocker | build, dependencies |
| [HBASE-14807](https://issues.apache.org/jira/browse/HBASE-14807) | TestWALLockup is flakey | Major | flakey, test |
| [HBASE-14843](https://issues.apache.org/jira/browse/HBASE-14843) | TestWALProcedureStore.testLoad is flakey | Blocker | proc-v2 |
| [HBASE-14838](https://issues.apache.org/jira/browse/HBASE-14838) | Clarify that SimpleRegionNormalizer does not merge empty (\<1MB) regions | Trivial | documentation, regionserver |
| [HBASE-13976](https://issues.apache.org/jira/browse/HBASE-13976) | release manager list in ref guide is missing 0.94 line | Major | documentation |
| [HBASE-14968](https://issues.apache.org/jira/browse/HBASE-14968) | ConcurrentModificationException in region close resulting in the region staying in closing state | Major | Region Assignment, regionserver |
| [HBASE-14929](https://issues.apache.org/jira/browse/HBASE-14929) | There is a space missing from Table "foo" is not currently available. | Trivial | . |
| [HBASE-14936](https://issues.apache.org/jira/browse/HBASE-14936) | CombinedBlockCache should overwrite CacheStats#rollMetricsPeriod() | Major | BlockCache |
| [HBASE-14701](https://issues.apache.org/jira/browse/HBASE-14701) | Fix flakey Failed tests: TestMobFlushSnapshotFromClient\>TestFlushSnapshotFromClient.testSkipFlushTableSnapshot:199 null | Major | test |
| [HBASE-14953](https://issues.apache.org/jira/browse/HBASE-14953) | HBaseInterClusterReplicationEndpoint: Do not retry the whole batch of edits in case of RejectedExecutionException | Critical | Replication |
| [HBASE-14960](https://issues.apache.org/jira/browse/HBASE-14960) | Fallback to using default RPCControllerFactory if class cannot be loaded | Major | . |
| [HBASE-14769](https://issues.apache.org/jira/browse/HBASE-14769) | Remove unused functions and duplicate javadocs from HBaseAdmin | Major | . |
| [HBASE-14901](https://issues.apache.org/jira/browse/HBASE-14901) | There is duplicated code to create/manage encryption keys | Minor | encryption |
| [HBASE-14941](https://issues.apache.org/jira/browse/HBASE-14941) | locate\_region shell command | Trivial | shell |
| [HBASE-14942](https://issues.apache.org/jira/browse/HBASE-14942) | Allow turning off BoundedByteBufferPool | Major | . |
| [HBASE-14954](https://issues.apache.org/jira/browse/HBASE-14954) | IllegalArgumentException was thrown when doing online configuration change in CompactSplitThread | Major | Compaction, regionserver |
| [HBASE-14804](https://issues.apache.org/jira/browse/HBASE-14804) | HBase shell's create table command ignores 'NORMALIZATION\_ENABLED' attribute | Minor | shell |
| [HBASE-14917](https://issues.apache.org/jira/browse/HBASE-14917) | Log in console if individual tests in test-patch.sh fail or pass | Minor | . |
| [HBASE-14930](https://issues.apache.org/jira/browse/HBASE-14930) | check\_compatibility.sh needs smarter exit codes | Major | . |
| [HBASE-14923](https://issues.apache.org/jira/browse/HBASE-14923) | VerifyReplication should not mask the exception during result comparison | Minor | tooling |
| [HBASE-14922](https://issues.apache.org/jira/browse/HBASE-14922) | Delayed flush doesn't work causing flush storms. | Major | regionserver |
| [HBASE-14926](https://issues.apache.org/jira/browse/HBASE-14926) | Hung ThriftServer; no timeout on read from client; if client crashes, worker thread gets stuck reading | Major | Thrift |
| [HBASE-14928](https://issues.apache.org/jira/browse/HBASE-14928) | Start row should be set for query through HBase REST gateway involving globbing option | Major | REST |
| [HBASE-14907](https://issues.apache.org/jira/browse/HBASE-14907) | NPE of MobUtils.hasMobColumns in Build failed in Jenkins: HBase-Trunk\_matrix » latest1.8,Hadoop #513 | Major | mob |
| [HBASE-14904](https://issues.apache.org/jira/browse/HBASE-14904) | Mark Base[En\|De]coder LimitedPrivate and fix binary compat issue | Major | . |
| [HBASE-13857](https://issues.apache.org/jira/browse/HBASE-13857) | Slow WAL Append count in ServerMetricsTmpl.jamon is hardcoded to zero | Major | regionserver, UI |
| [HBASE-14905](https://issues.apache.org/jira/browse/HBASE-14905) | VerifyReplication does not honour versions option | Major | tooling |
| [HBASE-14541](https://issues.apache.org/jira/browse/HBASE-14541) | TestHFileOutputFormat.testMRIncrementalLoadWithSplit failed due to too many splits and few retries | Major | HFile, test |
| [HBASE-14462](https://issues.apache.org/jira/browse/HBASE-14462) | rolling\_restart.sh --master-only throws "line 142: test: 0: unary operator expected" | Major | . |
| [HBASE-14896](https://issues.apache.org/jira/browse/HBASE-14896) | Resolve Javadoc warnings in WALKey and RegionMover | Minor | . |
| [HBASE-14531](https://issues.apache.org/jira/browse/HBASE-14531) | graceful\_stop.sh "if [ "$local" ]" condition unexpected behaviour | Major | scripts |
| [HBASE-14890](https://issues.apache.org/jira/browse/HBASE-14890) | Fix javadoc checkstyle errors | Major | . |
| [HBASE-14894](https://issues.apache.org/jira/browse/HBASE-14894) | Fix misspellings of threshold in log4j.properties files for tests | Trivial | . |
| [HBASE-14523](https://issues.apache.org/jira/browse/HBASE-14523) | rolling-restart.sh --graceful will start regionserver process on master node | Major | scripts |
| [HBASE-14893](https://issues.apache.org/jira/browse/HBASE-14893) | Race between mutation on region and region closing operation leads to NotServingRegionException | Major | . |
| [HBASE-14664](https://issues.apache.org/jira/browse/HBASE-14664) | Master failover issue: Backup master is unable to start if active master is killed and started in short time interval | Critical | master |
| [HBASE-14777](https://issues.apache.org/jira/browse/HBASE-14777) | Fix Inter Cluster Replication Future ordering issues | Critical | Replication |
| [HBASE-14885](https://issues.apache.org/jira/browse/HBASE-14885) | NullPointerException in HMaster#normalizeRegions() due to missing TableDescriptor | Major | master |
| [HBASE-14689](https://issues.apache.org/jira/browse/HBASE-14689) | Addendum and unit test for HBASE-13471 | Major | . |
| [HBASE-14463](https://issues.apache.org/jira/browse/HBASE-14463) | Severe performance downgrade when parallel reading a single key from BucketCache | Major | . |
| [HBASE-14861](https://issues.apache.org/jira/browse/HBASE-14861) | HBASE\_ZNODE\_FILE on master server is overwritten by regionserver process in case of master-rs collocation | Major | Operability |
| [HBASE-14825](https://issues.apache.org/jira/browse/HBASE-14825) | HBase Ref Guide corrections of typos/misspellings | Minor | documentation |
| [HBASE-14737](https://issues.apache.org/jira/browse/HBASE-14737) | Clear cachedMaxVersions when HColumnDescriptor#setValue(VERSIONS, value) is called | Major | . |
| [HBASE-14799](https://issues.apache.org/jira/browse/HBASE-14799) | Commons-collections object deserialization remote command execution vulnerability | Critical | dependencies, security |
| [HBASE-14840](https://issues.apache.org/jira/browse/HBASE-14840) | Sink cluster reports data replication request as success though the data is not replicated | Major | Replication |
| [HBASE-14712](https://issues.apache.org/jira/browse/HBASE-14712) | MasterProcWALs never clean up | Blocker | proc-v2 |
| [HBASE-14761](https://issues.apache.org/jira/browse/HBASE-14761) | Deletes with and without visibility expression do not delete the matching mutation | Major | security |
| [HBASE-14782](https://issues.apache.org/jira/browse/HBASE-14782) | FuzzyRowFilter skips valid rows | Major | Filters |
| [HBASE-14824](https://issues.apache.org/jira/browse/HBASE-14824) | HBaseAdmin.mergeRegions should recognize both full region names and encoded region names | Minor | Admin |
| [HBASE-14815](https://issues.apache.org/jira/browse/HBASE-14815) | TestMobExportSnapshot.testExportFailure timeout occasionally | Major | . |
| [HBASE-14823](https://issues.apache.org/jira/browse/HBASE-14823) | HBase Ref Guide Refactoring | Major | documentation |
| [HBASE-14812](https://issues.apache.org/jira/browse/HBASE-14812) | Fix ResultBoundedCompletionService deadlock | Major | Client, Thrift |
| [HBASE-14793](https://issues.apache.org/jira/browse/HBASE-14793) | Allow limiting size of block into L1 block cache. | Major | BlockCache |
| [HBASE-14806](https://issues.apache.org/jira/browse/HBASE-14806) | Missing sources.jar for several modules when building HBase | Major | pom |
| [HBASE-14809](https://issues.apache.org/jira/browse/HBASE-14809) | Grant / revoke Namespace admin permission to group | Major | security |
| [HBASE-14802](https://issues.apache.org/jira/browse/HBASE-14802) | Replaying server crash recovery procedure after a failover causes incorrect handling of deadservers | Major | master |
| [HBASE-13982](https://issues.apache.org/jira/browse/HBASE-13982) | Add info for visibility labels/cell TTLs to ImportTsv | Major | mapreduce |
| [HBASE-14797](https://issues.apache.org/jira/browse/HBASE-14797) | Last round of CSS fix-ups | Major | website |
| [HBASE-14788](https://issues.apache.org/jira/browse/HBASE-14788) | Splitting a region does not support the hbase.rs.evictblocksonclose config when closing source region | Major | regionserver |
| [HBASE-14778](https://issues.apache.org/jira/browse/HBASE-14778) | Make block cache hit percentages not integer in the metrics system | Major | BlockCache, metrics |
| [HBASE-14784](https://issues.apache.org/jira/browse/HBASE-14784) | Port conflict is not resolved in HBaseTestingUtility.randomFreePort() | Minor | test |
| [HBASE-14787](https://issues.apache.org/jira/browse/HBASE-14787) | Remove obsolete ConnectionImplementation.refCount | Trivial | . |
| [HBASE-14781](https://issues.apache.org/jira/browse/HBASE-14781) | Turn per cf flushing on for ITBLL by default | Major | integration tests |
| [HBASE-14774](https://issues.apache.org/jira/browse/HBASE-14774) | Raise the font size on high-DPI small-screen devices like iphone 6+ | Major | website |
| [HBASE-14767](https://issues.apache.org/jira/browse/HBASE-14767) | Remove deprecated functions from HBaseAdmin | Major | . |
| [HBASE-14759](https://issues.apache.org/jira/browse/HBASE-14759) | Avoid using Math.abs when selecting SyncRunner in FSHLog | Major | wal |
| [HBASE-14632](https://issues.apache.org/jira/browse/HBASE-14632) | Region server aborts due to unguarded dereference of Reader | Major | regionserver |
| [HBASE-14706](https://issues.apache.org/jira/browse/HBASE-14706) | RegionLocationFinder should return multiple servernames by top host | Major | Balancer |
| [HBASE-14755](https://issues.apache.org/jira/browse/HBASE-14755) | Fix some broken links and HTML problems | Major | documentation |
| [HBASE-14773](https://issues.apache.org/jira/browse/HBASE-14773) | Fix HBase shell tests are skipped when skipping server tests. | Major | test |
| [HBASE-14768](https://issues.apache.org/jira/browse/HBASE-14768) | bin/graceful\_stop.sh logs nothing as a balancer state to be stored | Trivial | scripts |
| [HBASE-14723](https://issues.apache.org/jira/browse/HBASE-14723) | Fix IT tests split too many times | Major | integration tests |
| [HBASE-14733](https://issues.apache.org/jira/browse/HBASE-14733) | Minor typo in alter\_namespace.rb | Trivial | shell |
| [HBASE-14754](https://issues.apache.org/jira/browse/HBASE-14754) | TestFastFailWithoutTestUtil failing on trunk now in #testPreemptiveFastFailException50Times | Major | flakey, test |
| [HBASE-14751](https://issues.apache.org/jira/browse/HBASE-14751) | Book seems to be broken | Major | . |
| [HBASE-14742](https://issues.apache.org/jira/browse/HBASE-14742) | TestHeapMemoryManager is flakey | Major | test |
| [HBASE-14739](https://issues.apache.org/jira/browse/HBASE-14739) | Fix broken link to Javadoc that is suppressed because it is generated code | Trivial | documentation |
| [HBASE-14532](https://issues.apache.org/jira/browse/HBASE-14532) | [book] dfs.client.read.shortcircuit is referenced as hbase-site.xml config and not described in section 7 | Minor | documentation |
| [HBASE-14711](https://issues.apache.org/jira/browse/HBASE-14711) | Remove or annotated deprecated methods in HRegionInfo | Major | hbase |
| [HBASE-14557](https://issues.apache.org/jira/browse/HBASE-14557) | MapReduce WALPlayer issue with NoTagsKeyValue | Blocker | tooling |
| [HBASE-14650](https://issues.apache.org/jira/browse/HBASE-14650) | Reenable TestNamespaceAuditor | Major | . |
| [HBASE-14660](https://issues.apache.org/jira/browse/HBASE-14660) | AssertionError found when using offheap BucketCache with assertion enabled | Major | . |
| [HBASE-14695](https://issues.apache.org/jira/browse/HBASE-14695) | Fix some easy HTML warnings | Minor | documentation |
| [HBASE-14425](https://issues.apache.org/jira/browse/HBASE-14425) | In Secure Zookeeper cluster superuser will not have sufficient permission if multiple values are configured in "hbase.superuser" | Major | security, Zookeeper |
| [HBASE-14674](https://issues.apache.org/jira/browse/HBASE-14674) | Rpc handler / task monitoring seems to be broken after 0.98 | Major | . |
| [HBASE-14705](https://issues.apache.org/jira/browse/HBASE-14705) | Javadoc for KeyValue constructor is not correct. | Minor | . |
| [HBASE-14680](https://issues.apache.org/jira/browse/HBASE-14680) | Two configs for snapshot timeout and better defaults | Major | snapshots |
| [HBASE-14349](https://issues.apache.org/jira/browse/HBASE-14349) | pre-commit zombie finder is overly broad | Critical | build |
| [HBASE-14694](https://issues.apache.org/jira/browse/HBASE-14694) | Scan copy constructor doesn't handle allowPartialResults | Major | Client |
| [HBASE-14257](https://issues.apache.org/jira/browse/HBASE-14257) | Periodic flusher only handles hbase:meta, not other system tables | Major | regionserver |
| [HBASE-14682](https://issues.apache.org/jira/browse/HBASE-14682) | CM restore functionality for regionservers is broken | Major | integration tests |
| [HBASE-14283](https://issues.apache.org/jira/browse/HBASE-14283) | Reverse scan doesn’t work with HFile inline index/bloom blocks | Major | . |
| [HBASE-13318](https://issues.apache.org/jira/browse/HBASE-13318) | RpcServer.getListenerAddress should handle when the accept channel is closed | Minor | . |
| [HBASE-14661](https://issues.apache.org/jira/browse/HBASE-14661) | RegionServer link is not opening, in HBase Table page. | Minor | UI |
| [HBASE-14690](https://issues.apache.org/jira/browse/HBASE-14690) | Fix css so there's no left/right scroll bar | Major | UI |
| [HBASE-14624](https://issues.apache.org/jira/browse/HBASE-14624) | BucketCache.freeBlock is too expensive | Major | BlockCache |
| [HBASE-14676](https://issues.apache.org/jira/browse/HBASE-14676) | HBaseTestCase clean out: Purge Incommon Interface and Table and Region implementations | Major | . |
| [HBASE-14343](https://issues.apache.org/jira/browse/HBASE-14343) | Fix debug message in SimpleRegionNormalizer for small regions | Trivial | regionserver |
| [HBASE-14681](https://issues.apache.org/jira/browse/HBASE-14681) | Upgrade Checkstyle plugin to 2.16 | Major | build |
| [HBASE-14667](https://issues.apache.org/jira/browse/HBASE-14667) | HBaseFsck constructors have diverged | Minor | hbck |
| [HBASE-14658](https://issues.apache.org/jira/browse/HBASE-14658) | Allow loading a MonkeyFactory by class name | Major | integration tests, test |
| [HBASE-14603](https://issues.apache.org/jira/browse/HBASE-14603) | Lots of work on the POM to enhance Javadocs, Xrefs | Major | documentation |
| [HBASE-14326](https://issues.apache.org/jira/browse/HBASE-14326) | HBase book: fix definition of max min size to compact | Major | documentation |
| [HBASE-14663](https://issues.apache.org/jira/browse/HBASE-14663) | HStore::close does not honor config hbase.rs.evictblocksonclose | Minor | BlockCache, regionserver |
| [HBASE-14427](https://issues.apache.org/jira/browse/HBASE-14427) | Fix 'should' assertions in TestFastFail | Minor | test |
| [HBASE-14633](https://issues.apache.org/jira/browse/HBASE-14633) | Try fluid width UI | Major | UI |
| [HBASE-14366](https://issues.apache.org/jira/browse/HBASE-14366) | NPE in case visibility expression is not present in labels table during importtsv run | Minor | . |
| [HBASE-14604](https://issues.apache.org/jira/browse/HBASE-14604) | Improve MoveCostFunction in StochasticLoadBalancer | Major | Balancer |
| [HBASE-14606](https://issues.apache.org/jira/browse/HBASE-14606) | TestSecureLoadIncrementalHFiles tests timed out in trunk build on apache | Major | test |
| [HBASE-12558](https://issues.apache.org/jira/browse/HBASE-12558) | Disable TestHCM.testClusterStatus Unexpected exception, expected\<org.apache.hadoop.hbase.regionserver.RegionServerStoppedException\> but was\<junit.framework.AssertionFailedError\> | Major | test |
| [HBASE-14458](https://issues.apache.org/jira/browse/HBASE-14458) | AsyncRpcClient#createRpcChannel() should check and remove dead channel before creating new one to same server | Critical | IPC/RPC |
| [HBASE-14634](https://issues.apache.org/jira/browse/HBASE-14634) | Disable flakey TestSnapshotCloneIndependence.testOnlineSnapshotDeleteIndependent | Major | test |
| [HBASE-14621](https://issues.apache.org/jira/browse/HBASE-14621) | ReplicationLogCleaner gets stuck when a regionserver crashes | Critical | Replication |
| [HBASE-14625](https://issues.apache.org/jira/browse/HBASE-14625) | Chaos Monkey should shut down faster | Major | integration tests, test |
| [HBASE-14597](https://issues.apache.org/jira/browse/HBASE-14597) | Fix Groups cache in multi-threaded env | Major | . |
| [HBASE-14474](https://issues.apache.org/jira/browse/HBASE-14474) | DeadLock in RpcClientImpl.Connection.close() | Blocker | IPC/RPC |
| [HBASE-14594](https://issues.apache.org/jira/browse/HBASE-14594) | Use new DNS API introduced in HADOOP-12437 | Major | util |
| [HBASE-14521](https://issues.apache.org/jira/browse/HBASE-14521) | Unify the semantic of hbase.client.retries.number | Major | . |
| [HBASE-14608](https://issues.apache.org/jira/browse/HBASE-14608) | testWalRollOnLowReplication has some risk to assert failed after HBASE-14600 | Major | test |
| [HBASE-14598](https://issues.apache.org/jira/browse/HBASE-14598) | ByteBufferOutputStream grows its HeapByteBuffer beyond JVM limitations | Major | Client, io |
| [HBASE-14591](https://issues.apache.org/jira/browse/HBASE-14591) | Region with reference hfile may split after a forced split in IncreasingToUpperBoundRegionSplitPolicy | Critical | regionserver |
| [HBASE-14599](https://issues.apache.org/jira/browse/HBASE-14599) | Modify site config to use protocol-relative URLs for CSS/JS | Blocker | documentation |
| [HBASE-14501](https://issues.apache.org/jira/browse/HBASE-14501) | NPE in replication when HDFS transparent encryption is enabled. | Critical | Replication, security |
| [HBASE-14211](https://issues.apache.org/jira/browse/HBASE-14211) | Add more rigorous integration tests of splits | Major | integration tests, test |
| [HBASE-14592](https://issues.apache.org/jira/browse/HBASE-14592) | BatchRestartRsAction always restarts 0 RS when running SlowDeterministicMonkey | Major | integration tests |
| [HBASE-14577](https://issues.apache.org/jira/browse/HBASE-14577) | HBase shell help for scan and returning a column family has a typo | Trivial | shell |
| [HBASE-14578](https://issues.apache.org/jira/browse/HBASE-14578) | URISyntaxException during snapshot restore for table with user defined namespace | Major | snapshots |
| [HBASE-14581](https://issues.apache.org/jira/browse/HBASE-14581) | Znode cleanup throws auth exception in secure mode | Major | security, Zookeeper |
| [HBASE-13858](https://issues.apache.org/jira/browse/HBASE-13858) | RS/MasterDumpServlet dumps threads before its “Stacks” header | Trivial | master, regionserver, UI |
| [HBASE-14525](https://issues.apache.org/jira/browse/HBASE-14525) | Append and increment operation throws NullPointerException on non-existing column families. | Minor | shell |
| [HBASE-14497](https://issues.apache.org/jira/browse/HBASE-14497) | Reverse Scan threw StackOverflow caused by readPt checking | Major | . |
| [HBASE-14346](https://issues.apache.org/jira/browse/HBASE-14346) | Typo in FamilyFilter | Trivial | documentation |
| [HBASE-12983](https://issues.apache.org/jira/browse/HBASE-12983) | HBase book mentions hadoop.ssl.enabled when it should be hbase.ssl.enabled | Major | documentation |
| [HBASE-12615](https://issues.apache.org/jira/browse/HBASE-12615) | Document GC conserving guidelines for contributors | Major | documentation |
| [HBASE-14555](https://issues.apache.org/jira/browse/HBASE-14555) | Deadlock in MVCC branch-1.2 toString() | Critical | regionserver |
| [HBASE-14347](https://issues.apache.org/jira/browse/HBASE-14347) | Add a switch to DynamicClassLoader to disable it | Major | Client, defaults, regionserver |
| [HBASE-14544](https://issues.apache.org/jira/browse/HBASE-14544) | Allow HConnectionImpl to not refresh the dns on errors | Major | Client |
| [HBASE-14367](https://issues.apache.org/jira/browse/HBASE-14367) | Add normalization support to shell | Major | Balancer, shell |
| [HBASE-14545](https://issues.apache.org/jira/browse/HBASE-14545) | TestMasterFailover often times out | Major | test |
| [HBASE-14499](https://issues.apache.org/jira/browse/HBASE-14499) | Master coprocessors shutdown will not happen on master abort | Major | master |
| [HBASE-13770](https://issues.apache.org/jira/browse/HBASE-13770) | Programmatic JAAS configuration option for secure zookeeper may be broken | Major | Operability, security |
| [HBASE-14292](https://issues.apache.org/jira/browse/HBASE-14292) | Call Me Maybe HBase links haved moved | Minor | documentation |
| [HBASE-13744](https://issues.apache.org/jira/browse/HBASE-13744) | TestCorruptedRegionStoreFile is flaky | Major | test |
| [HBASE-13143](https://issues.apache.org/jira/browse/HBASE-13143) | TestCacheOnWrite is flaky and needs a diet | Critical | test |
| [HBASE-14475](https://issues.apache.org/jira/browse/HBASE-14475) | Region split requests are always audited with "hbase" user rather than request user | Major | regionserver, security |
| [HBASE-14494](https://issues.apache.org/jira/browse/HBASE-14494) | Wrong usage messages on shell commands | Minor | shell |
| [HBASE-14518](https://issues.apache.org/jira/browse/HBASE-14518) | Give TestScanEarlyTermination the same treatment as 'HBASE-14378 Get TestAccessController\* passing again...' -- up priority handlers | Major | test |
| [HBASE-14394](https://issues.apache.org/jira/browse/HBASE-14394) | Properly close the connection after reading records from table. | Minor | mapreduce |
| [HBASE-14510](https://issues.apache.org/jira/browse/HBASE-14510) | Can not set coprocessor from Shell after HBASE-14224 | Major | Coprocessors, shell |
| [HBASE-14362](https://issues.apache.org/jira/browse/HBASE-14362) | org.apache.hadoop.hbase.master.procedure.TestWALProcedureStoreOnHDFS is super duper flaky | Critical | test |
| [HBASE-14473](https://issues.apache.org/jira/browse/HBASE-14473) | Compute region locality in parallel | Major | Balancer |
| [HBASE-14437](https://issues.apache.org/jira/browse/HBASE-14437) | ArithmeticException in ReplicationInterClusterEndpoint | Minor | Replication |
| [HBASE-14500](https://issues.apache.org/jira/browse/HBASE-14500) | Remove load of deprecated MOB ruby scripts after HBASE-14227 | Major | shell |
| [HBASE-14489](https://issues.apache.org/jira/browse/HBASE-14489) | postScannerFilterRow consumes a lot of CPU | Major | Coprocessors, Performance |
| [HBASE-14370](https://issues.apache.org/jira/browse/HBASE-14370) | Use separate thread for calling ZKPermissionWatcher#refreshNodes() | Major | . |
| [HBASE-14492](https://issues.apache.org/jira/browse/HBASE-14492) | Increase REST server header buffer size from 8k to 64k | Major | REST |
| [HBASE-14471](https://issues.apache.org/jira/browse/HBASE-14471) | Thrift - HTTP Error 413 full HEAD if using kerberos authentication | Major | Thrift |
| [HBASE-14469](https://issues.apache.org/jira/browse/HBASE-14469) | Fix some comment, validation and logging around memstore lower limit configuration | Minor | . |
| [HBASE-14486](https://issues.apache.org/jira/browse/HBASE-14486) | Disable TestRegionPlacement, a flakey test for an unfinished feature | Major | test |
| [HBASE-13324](https://issues.apache.org/jira/browse/HBASE-13324) | o.a.h.h.Coprocessor should be LimitedPrivate("Coprocessor") | Minor | API |
| [HBASE-14445](https://issues.apache.org/jira/browse/HBASE-14445) | ExportSnapshot does not honor -chmod option | Major | snapshots |
| [HBASE-14338](https://issues.apache.org/jira/browse/HBASE-14338) | License notification misspells 'Asciidoctor' | Minor | . |
| [HBASE-14280](https://issues.apache.org/jira/browse/HBASE-14280) | Bulk Upload from HA cluster to remote HA hbase cluster fails | Minor | hadoop2, regionserver |
| [HBASE-14431](https://issues.apache.org/jira/browse/HBASE-14431) | AsyncRpcClient#removeConnection() never removes connection from connections pool if server fails | Critical | IPC/RPC |
| [HBASE-14449](https://issues.apache.org/jira/browse/HBASE-14449) | Rewrite deadlock prevention for concurrent connection close | Major | master, metrics |
| [HBASE-13250](https://issues.apache.org/jira/browse/HBASE-13250) | chown of ExportSnapshot does not cover all path and files | Critical | snapshots |
| [HBASE-14411](https://issues.apache.org/jira/browse/HBASE-14411) | Fix unit test failures when using multiwal as default WAL provider | Major | . |
| [HBASE-14429](https://issues.apache.org/jira/browse/HBASE-14429) | Checkstyle report is broken | Minor | scripts |
| [HBASE-14400](https://issues.apache.org/jira/browse/HBASE-14400) | Fix HBase RPC protection documentation | Critical | encryption, IPC/RPC, security |
| [HBASE-14145](https://issues.apache.org/jira/browse/HBASE-14145) | Allow the Canary in regionserver mode to try all regions on the server, not just one | Major | canary, util |
| [HBASE-14380](https://issues.apache.org/jira/browse/HBASE-14380) | Correct data gets skipped along with bad data in importTsv bulk load thru TsvImporterTextMapper | Major | mapreduce, tooling |
| [HBASE-14307](https://issues.apache.org/jira/browse/HBASE-14307) | Incorrect use of positional read api in HFileBlock | Major | io |
| [HBASE-14392](https://issues.apache.org/jira/browse/HBASE-14392) | [tests] TestLogRollingNoCluster fails on master from time to time | Major | test |
| [HBASE-14382](https://issues.apache.org/jira/browse/HBASE-14382) | TestInterfaceAudienceAnnotations should hadoop-compt module resources | Minor | test |
| [HBASE-14385](https://issues.apache.org/jira/browse/HBASE-14385) | Close the sockets that is missing in connection closure. | Minor | Client |
| [HBASE-14393](https://issues.apache.org/jira/browse/HBASE-14393) | Have TestHFileEncryption clean up after itself so it don't go all zombie on us | Major | test |
| [HBASE-14384](https://issues.apache.org/jira/browse/HBASE-14384) | Trying to run canary locally with -regionserver option causes exception | Major | canary |
| [HBASE-14317](https://issues.apache.org/jira/browse/HBASE-14317) | Stuck FSHLog: bad disk (HDFS-8960) and can't roll WAL | Blocker | wal |
| [HBASE-14327](https://issues.apache.org/jira/browse/HBASE-14327) | TestIOFencing#testFencingAroundCompactionAfterWALSync is flaky | Critical | test |
| [HBASE-14359](https://issues.apache.org/jira/browse/HBASE-14359) | HTable#close will hang forever if unchecked error/exception thrown in AsyncProcess#sendMultiAction | Major | Client |
| [HBASE-14229](https://issues.apache.org/jira/browse/HBASE-14229) | Flushing canceled by coprocessor still leads to memstoreSize set down | Major | regionserver |
| [HBASE-14337](https://issues.apache.org/jira/browse/HBASE-14337) | build error on master | Major | . |
| [HBASE-14354](https://issues.apache.org/jira/browse/HBASE-14354) | Minor improvements for usage of the mlock agent | Trivial | hbase, regionserver |
| [HBASE-13221](https://issues.apache.org/jira/browse/HBASE-13221) | HDFS Transparent Encryption breaks WAL writing in Hadoop 2.6.0 | Critical | documentation, wal |
| [HBASE-14258](https://issues.apache.org/jira/browse/HBASE-14258) | Make region\_mover.rb script case insensitive with regard to hostname | Minor | . |
| [HBASE-14315](https://issues.apache.org/jira/browse/HBASE-14315) | Save one call to KeyValueHeap.peek per row | Major | . |
| [HBASE-14313](https://issues.apache.org/jira/browse/HBASE-14313) | After a Connection sees ConnectionClosingException it never recovers | Critical | Client |
| [HBASE-13339](https://issues.apache.org/jira/browse/HBASE-13339) | Update default Hadoop version to latest for master | Blocker | build |
| [HBASE-14269](https://issues.apache.org/jira/browse/HBASE-14269) | FuzzyRowFilter omits certain rows when multiple fuzzy keys exist | Major | Filters |
| [HBASE-14302](https://issues.apache.org/jira/browse/HBASE-14302) | TableSnapshotInputFormat should not create back references when restoring snapshot | Major | . |
| [HBASE-14224](https://issues.apache.org/jira/browse/HBASE-14224) | Fix coprocessor handling of duplicate classes | Critical | Coprocessors |
| [HBASE-13480](https://issues.apache.org/jira/browse/HBASE-13480) | ShortCircuitConnection doesn't short-circuit all calls as expected | Critical | Client |
| [HBASE-14273](https://issues.apache.org/jira/browse/HBASE-14273) | Rename MVCC to MVCC: From MultiVersionConsistencyControl to MultiVersionConcurrencyControl | Major | regionserver |
| [HBASE-14291](https://issues.apache.org/jira/browse/HBASE-14291) | NPE On StochasticLoadBalancer Balance Involving RS With No Regions | Minor | Balancer |
| [HBASE-14250](https://issues.apache.org/jira/browse/HBASE-14250) | branch-1.1 hbase-server test-jar has incorrect LICENSE | Blocker | build |
| [HBASE-14251](https://issues.apache.org/jira/browse/HBASE-14251) | javadoc jars use LICENSE/NOTICE from primary artifact | Blocker | build |
| [HBASE-14249](https://issues.apache.org/jira/browse/HBASE-14249) | shaded jar modules create spurious source and test jars with incorrect LICENSE/NOTICE info | Major | build |
| [HBASE-14243](https://issues.apache.org/jira/browse/HBASE-14243) | Incorrect NOTICE file in hbase-it test-jar | Blocker | build |
| [HBASE-14234](https://issues.apache.org/jira/browse/HBASE-14234) | Procedure-V2: Exception encountered in WALProcedureStore#rollWriter() should be properly handled | Minor | proc-v2 |
| [HBASE-14241](https://issues.apache.org/jira/browse/HBASE-14241) | Fix deadlock during cluster shutdown due to concurrent connection close | Critical | master, metrics |
| [HBASE-14228](https://issues.apache.org/jira/browse/HBASE-14228) | Close BufferedMutator and connection in MultiTableOutputFormat | Minor | mapreduce |
| [HBASE-14166](https://issues.apache.org/jira/browse/HBASE-14166) | Per-Region metrics can be stale | Major | metrics |
| [HBASE-10844](https://issues.apache.org/jira/browse/HBASE-10844) | Coprocessor failure during batchmutation leaves the memstore datastructs in an inconsistent state | Major | regionserver |
| [HBASE-13966](https://issues.apache.org/jira/browse/HBASE-13966) | Limit column width in table.jsp | Minor | Operability, UI |
| [HBASE-14219](https://issues.apache.org/jira/browse/HBASE-14219) | src tgz no longer builds after HBASE-14085 | Blocker | build |
| [HBASE-14214](https://issues.apache.org/jira/browse/HBASE-14214) | list\_labels shouldn't raise ArgumentError if no labels are defined | Minor | . |
| [HBASE-14054](https://issues.apache.org/jira/browse/HBASE-14054) | Acknowledged writes may get lost if regionserver clock is set backwards | Major | regionserver |
| [HBASE-14098](https://issues.apache.org/jira/browse/HBASE-14098) | Allow dropping caches behind compactions | Major | Compaction, hadoop2, HFile |
| [HBASE-14196](https://issues.apache.org/jira/browse/HBASE-14196) | Thrift server idle connection timeout issue | Major | Thrift |
| [HBASE-14209](https://issues.apache.org/jira/browse/HBASE-14209) | TestShell visibility tests failing | Major | security, shell |
| [HBASE-14201](https://issues.apache.org/jira/browse/HBASE-14201) | hbck should not take a lock unless fixing errors | Major | hbck, util |
| [HBASE-13889](https://issues.apache.org/jira/browse/HBASE-13889) | Fix hbase-shaded-client artifact so it works on hbase-downstreamer | Critical | Client |
| [HBASE-14208](https://issues.apache.org/jira/browse/HBASE-14208) | Remove yarn dependencies on -common and -client | Major | build, Client |
| [HBASE-14206](https://issues.apache.org/jira/browse/HBASE-14206) | MultiRowRangeFilter returns records whose rowKeys are out of allowed ranges | Critical | Filters |
| [HBASE-13062](https://issues.apache.org/jira/browse/HBASE-13062) | Add documentation coverage for configuring dns server with thrift and rest gateways | Minor | documentation |
| [HBASE-5878](https://issues.apache.org/jira/browse/HBASE-5878) | Use getVisibleLength public api from HdfsDataInputStream from Hadoop-2. | Major | wal |
| [HBASE-14092](https://issues.apache.org/jira/browse/HBASE-14092) | hbck should run without locks by default and only disable the balancer when necessary | Major | hbck, util |
| [HBASE-13924](https://issues.apache.org/jira/browse/HBASE-13924) | Description for hbase.dynamic.jars.dir is wrong | Major | . |
| [HBASE-12865](https://issues.apache.org/jira/browse/HBASE-12865) | WALs may be deleted before they are replicated to peers | Critical | Replication |
| [HBASE-13825](https://issues.apache.org/jira/browse/HBASE-13825) | Use ProtobufUtil#mergeFrom and ProtobufUtil#mergeDelimitedFrom in place of builder methods of same name | Major | util |
| [HBASE-13865](https://issues.apache.org/jira/browse/HBASE-13865) | Increase the default value for hbase.hregion.memstore.block.multipler from 2 to 4 (part 2) | Trivial | regionserver |
| [HBASE-14178](https://issues.apache.org/jira/browse/HBASE-14178) | regionserver blocks because of waiting for offsetLock | Major | regionserver |
| [HBASE-14183](https://issues.apache.org/jira/browse/HBASE-14183) | [Shell] Scanning hbase meta table is failing in master branch | Major | shell |
| [HBASE-14021](https://issues.apache.org/jira/browse/HBASE-14021) | Quota table has a wrong description on the UI | Minor | UI |
| [HBASE-14185](https://issues.apache.org/jira/browse/HBASE-14185) | Incorrect region names logged by MemStoreFlusher | Minor | regionserver |
| [HBASE-13864](https://issues.apache.org/jira/browse/HBASE-13864) | HColumnDescriptor should parse the output from master and from describe for TTL | Major | shell |
| [HBASE-14162](https://issues.apache.org/jira/browse/HBASE-14162) | Fixing maven target for regenerating thrift classes fails against 0.9.2 | Blocker | build, Thrift |
| [HBASE-14168](https://issues.apache.org/jira/browse/HBASE-14168) | Avoid useless retry for DoNotRetryIOException in TableRecordReaderImpl | Minor | mapreduce |
| [HBASE-14173](https://issues.apache.org/jira/browse/HBASE-14173) | includeMVCCReadpoint parameter in DefaultCompactor#createTmpWriter() represents no-op | Major | . |
| [HBASE-14155](https://issues.apache.org/jira/browse/HBASE-14155) | StackOverflowError in reverse scan | Critical | regionserver, Scanners |
| [HBASE-14153](https://issues.apache.org/jira/browse/HBASE-14153) | Typo in ProcedureManagerHost.MASTER\_PROCEUDRE\_CONF\_KEY | Trivial | . |
| [HBASE-14157](https://issues.apache.org/jira/browse/HBASE-14157) | Interfaces implemented by subclasses should be checked when registering CoprocessorService | Major | Coprocessors |
| [HBASE-14024](https://issues.apache.org/jira/browse/HBASE-14024) | ImportTsv is not loading hbase-default.xml | Critical | mapreduce |
| [HBASE-14156](https://issues.apache.org/jira/browse/HBASE-14156) | Fix test failure in TestOpenTableInCoprocessor | Major | . |
| [HBASE-14146](https://issues.apache.org/jira/browse/HBASE-14146) | Once replication sees an error it slows down forever | Major | Replication |
| [HBASE-14115](https://issues.apache.org/jira/browse/HBASE-14115) | Fix resource leak in HMasterCommandLine | Major | master, tooling |
| [HBASE-14119](https://issues.apache.org/jira/browse/HBASE-14119) | Show meaningful error messages instead of stack traces in hbase shell commands. Fixing few commands in this jira. | Minor | . |
| [HBASE-14065](https://issues.apache.org/jira/browse/HBASE-14065) | ref guide section on release candidate generation refers to old doc files | Major | documentation |
| [HBASE-14000](https://issues.apache.org/jira/browse/HBASE-14000) | Region server failed to report to Master and was stuck in reportForDuty retry loop | Major | regionserver |
| [HBASE-14106](https://issues.apache.org/jira/browse/HBASE-14106) | TestProcedureRecovery is flaky | Major | proc-v2, test |
| [HBASE-14076](https://issues.apache.org/jira/browse/HBASE-14076) | ResultSerialization and MutationSerialization can throw InvalidProtocolBufferException when serializing a cell larger than 64MB | Major | . |
| [HBASE-13971](https://issues.apache.org/jira/browse/HBASE-13971) | Flushes stuck since 6 hours on a regionserver. | Critical | regionserver |
| [HBASE-14050](https://issues.apache.org/jira/browse/HBASE-14050) | NPE in org.apache.hadoop.hbase.ipc.RpcServer$Connection.readAndProcess | Minor | . |
| [HBASE-14100](https://issues.apache.org/jira/browse/HBASE-14100) | Fix high priority findbugs warnings | Major | regionserver |
| [HBASE-14089](https://issues.apache.org/jira/browse/HBASE-14089) | Remove unnecessary draw of system entropy from RecoverableZooKeeper | Minor | . |
| [HBASE-14094](https://issues.apache.org/jira/browse/HBASE-14094) | Procedure.proto can't be compiled to C++ | Major | proc-v2, Protobufs |
| [HBASE-14077](https://issues.apache.org/jira/browse/HBASE-14077) | Add package to hbase-protocol protobuf files. | Major | Protobufs |
| [HBASE-14041](https://issues.apache.org/jira/browse/HBASE-14041) | Client MetaCache is cleared if a ThrottlingException is thrown | Minor | Client |
| [HBASE-13897](https://issues.apache.org/jira/browse/HBASE-13897) | OOM may occur when Import imports a row with too many KeyValues | Major | . |
| [HBASE-14073](https://issues.apache.org/jira/browse/HBASE-14073) | TestRemoteTable.testDelete failed in the latest trunk code | Major | REST |
| [HBASE-13997](https://issues.apache.org/jira/browse/HBASE-13997) | ScannerCallableWithReplicas cause Infinitely blocking | Minor | Client |
| [HBASE-14029](https://issues.apache.org/jira/browse/HBASE-14029) | getting started for standalone still references hadoop-version-specific binary artifacts | Major | documentation |
| [HBASE-14042](https://issues.apache.org/jira/browse/HBASE-14042) | Fix FATAL level logging in FSHLog where logged for non fatal exceptions | Major | Operability, wal |
| [HBASE-13337](https://issues.apache.org/jira/browse/HBASE-13337) | Table regions are not assigning back, after restarting all regionservers at once. | Blocker | Region Assignment |
| [HBASE-13561](https://issues.apache.org/jira/browse/HBASE-13561) | ITBLL.Verify doesn't actually evaluate counters after job completes | Major | integration tests |
| [HBASE-13988](https://issues.apache.org/jira/browse/HBASE-13988) | Add exception handler for lease thread | Minor | . |
| [HBASE-13352](https://issues.apache.org/jira/browse/HBASE-13352) | Add hbase.import.version to Import usage. | Major | . |
| [HBASE-14012](https://issues.apache.org/jira/browse/HBASE-14012) | Double Assignment and Dataloss when ServerCrashProcedure runs during Master failover | Blocker | master, Region Assignment |
| [HBASE-13329](https://issues.apache.org/jira/browse/HBASE-13329) | ArrayIndexOutOfBoundsException in CellComparator#getMinimumMidpointArray | Critical | regionserver |
| [HBASE-14011](https://issues.apache.org/jira/browse/HBASE-14011) | MultiByteBuffer position based reads does not work correctly | Major | . |
| [HBASE-13861](https://issues.apache.org/jira/browse/HBASE-13861) | BucketCacheTmpl.jamon has wrong bucket free and used labels | Major | regionserver, UI |
| [HBASE-14010](https://issues.apache.org/jira/browse/HBASE-14010) | TestRegionRebalancing.testRebalanceOnRegionServerNumberChange fails; cluster not balanced | Major | test |
| [HBASE-14005](https://issues.apache.org/jira/browse/HBASE-14005) | Set permission to .top hfile in LoadIncrementalHFiles | Trivial | . |
| [HBASE-13970](https://issues.apache.org/jira/browse/HBASE-13970) | NPE during compaction in trunk | Major | regionserver |
| [HBASE-13895](https://issues.apache.org/jira/browse/HBASE-13895) | DATALOSS: Region assigned before WAL replay when abort | Critical | Recovery, Region Assignment, wal |
| [HBASE-13978](https://issues.apache.org/jira/browse/HBASE-13978) | Variable never assigned in SimpleTotalOrderPartitioner.getPartition() | Major | mapreduce |
| [HBASE-13995](https://issues.apache.org/jira/browse/HBASE-13995) | ServerName is not fully case insensitive | Major | Region Assignment |
| [HBASE-13959](https://issues.apache.org/jira/browse/HBASE-13959) | Region splitting uses a single thread in most common cases | Critical | regionserver |
| [HBASE-13989](https://issues.apache.org/jira/browse/HBASE-13989) | Threshold for combined MemStore and BlockCache percentages is not checked | Major | regionserver |
| [HBASE-13930](https://issues.apache.org/jira/browse/HBASE-13930) | Exclude Findbugs packages from shaded jars | Major | build, Client |
| [HBASE-13863](https://issues.apache.org/jira/browse/HBASE-13863) | Multi-wal feature breaks reported number and size of HLogs | Major | regionserver, UI |
| [HBASE-13974](https://issues.apache.org/jira/browse/HBASE-13974) | TestRateLimiter#testFixedIntervalResourceAvailability may fail | Minor | test |
| [HBASE-13969](https://issues.apache.org/jira/browse/HBASE-13969) | AuthenticationTokenSecretManager is never stopped in RPCServer | Minor | . |
| [HBASE-13923](https://issues.apache.org/jira/browse/HBASE-13923) | Loaded region coprocessors are not reported in shell status command | Major | regionserver, shell |
| [HBASE-13893](https://issues.apache.org/jira/browse/HBASE-13893) | Replace HTable with Table in client tests | Major | Client, test |
| [HBASE-13835](https://issues.apache.org/jira/browse/HBASE-13835) | KeyValueHeap.current might be in heap when exception happens in pollRealKV | Major | Scanners |
| [HBASE-13945](https://issues.apache.org/jira/browse/HBASE-13945) | Prefix\_Tree seekBefore() does not work correctly | Major | io |
| [HBASE-13958](https://issues.apache.org/jira/browse/HBASE-13958) | RESTApiClusterManager calls kill() instead of suspend() and resume() | Minor | integration tests |
| [HBASE-13938](https://issues.apache.org/jira/browse/HBASE-13938) | Deletes done during the region merge transaction may get eclipsed | Major | master, regionserver |
| [HBASE-13933](https://issues.apache.org/jira/browse/HBASE-13933) | DBE's seekBefore with tags corrupts the tag's offset information thus leading to incorrect results | Critical | io |
| [HBASE-13877](https://issues.apache.org/jira/browse/HBASE-13877) | Interrupt to flush from TableFlushProcedure causes dataloss in ITBLL | Blocker | integration tests, proc-v2 |
| [HBASE-13918](https://issues.apache.org/jira/browse/HBASE-13918) | Fix hbase:namespace description in webUI | Trivial | hbase |
| [HBASE-13885](https://issues.apache.org/jira/browse/HBASE-13885) | ZK watches leaks during snapshots | Critical | snapshots |
| [HBASE-13737](https://issues.apache.org/jira/browse/HBASE-13737) | [HBase MOB] MOBTable cloned from a snapshot leads to data loss, when that actual snapshot and main table is deleted. | Critical | mob |
| [HBASE-13913](https://issues.apache.org/jira/browse/HBASE-13913) | RAT exclusion list missing asciidoctor support files | Major | . |
| [HBASE-13279](https://issues.apache.org/jira/browse/HBASE-13279) | Add src/main/asciidoc/asciidoctor.css to RAT exclusion list in POM | Minor | documentation |
| [HBASE-13821](https://issues.apache.org/jira/browse/HBASE-13821) | WARN if hbase.bucketcache.percentage.in.combinedcache is set | Minor | regionserver, Usability |
| [HBASE-13888](https://issues.apache.org/jira/browse/HBASE-13888) | Fix refill bug from HBASE-13686 | Major | regionserver |
| [HBASE-13905](https://issues.apache.org/jira/browse/HBASE-13905) | TestRecoveredEdits.testReplayWorksThoughLotsOfFlushing failing consistently on branch-1.1 | Critical | regionserver, test |
| [HBASE-13833](https://issues.apache.org/jira/browse/HBASE-13833) | LoadIncrementalHFile.doBulkLoad(Path,HTable) doesn't handle unmanaged connections when using SecureBulkLoad | Major | tooling |
| [HBASE-13901](https://issues.apache.org/jira/browse/HBASE-13901) | Error while calling watcher on creating and deleting an HBase table | Minor | . |
| [HBASE-13892](https://issues.apache.org/jira/browse/HBASE-13892) | Scanner with all results filtered out results in NPE | Critical | Client |
| [HBASE-13560](https://issues.apache.org/jira/browse/HBASE-13560) | Large compaction queue should steal from small compaction queue when idle | Major | Compaction |
| [HBASE-13878](https://issues.apache.org/jira/browse/HBASE-13878) | Set hbase.fs.tmp.dir config in HBaseTestingUtility.java for Phoenix UT to use | Minor | test |
| [HBASE-13873](https://issues.apache.org/jira/browse/HBASE-13873) | LoadTestTool addAuthInfoToConf throws UnsupportedOperationException | Major | integration tests |
| [HBASE-13875](https://issues.apache.org/jira/browse/HBASE-13875) | Clock skew between master and region server may render restored region without server address | Major | snapshots |
| [HBASE-13845](https://issues.apache.org/jira/browse/HBASE-13845) | Expire of one region server carrying meta can bring down the master | Major | master |
| [HBASE-13847](https://issues.apache.org/jira/browse/HBASE-13847) | getWriteRequestCount function in HRegionServer uses int variable to return the count. | Major | hbase, regionserver |
| [HBASE-13811](https://issues.apache.org/jira/browse/HBASE-13811) | Splitting WALs, we are filtering out too many edits -\> DATALOSS | Critical | wal |
| [HBASE-13853](https://issues.apache.org/jira/browse/HBASE-13853) | ITBLL improvements after HBASE-13811 | Blocker | integration tests, tooling, wal |
| [HBASE-13686](https://issues.apache.org/jira/browse/HBASE-13686) | Fail to limit rate in RateLimiter | Major | Client |
| [HBASE-13851](https://issues.apache.org/jira/browse/HBASE-13851) | RpcClientImpl.close() can hang with cancelled replica RPCs | Major | IPC/RPC |
| [HBASE-13834](https://issues.apache.org/jira/browse/HBASE-13834) | Evict count not properly passed to HeapMemoryTuner. | Major | hbase, regionserver |
| [HBASE-13729](https://issues.apache.org/jira/browse/HBASE-13729) | Old hbase.regionserver.global.memstore.upperLimit and lowerLimit properties are ignored if present | Critical | regionserver |
| [HBASE-13789](https://issues.apache.org/jira/browse/HBASE-13789) | ForeignException should not be sent to the client | Minor | Client, master |
| [HBASE-13779](https://issues.apache.org/jira/browse/HBASE-13779) | Calling table.exists() before table.get() end up with an empty Result | Major | Client |
| [HBASE-13831](https://issues.apache.org/jira/browse/HBASE-13831) | TestHBaseFsck#testParallelHbck is flaky against hadoop 2.6+ | Minor | hbck, test |
| [HBASE-13826](https://issues.apache.org/jira/browse/HBASE-13826) | Unable to create table when group acls are appropriately set. | Major | security |
| [HBASE-13824](https://issues.apache.org/jira/browse/HBASE-13824) | TestGenerateDelegationToken: Master fails to start in Windows environment | Minor | test |
| [HBASE-13647](https://issues.apache.org/jira/browse/HBASE-13647) | Default value for hbase.client.operation.timeout is too high | Blocker | Client |
| [HBASE-13820](https://issues.apache.org/jira/browse/HBASE-13820) | Zookeeper is failing to start | Critical | . |
| [HBASE-13638](https://issues.apache.org/jira/browse/HBASE-13638) | Put copy constructor is shallow | Major | Client |
| [HBASE-13809](https://issues.apache.org/jira/browse/HBASE-13809) | TestRowTooBig should use HDFS directory for its region directory | Minor | test |
| [HBASE-13812](https://issues.apache.org/jira/browse/HBASE-13812) | Deleting of last Column Family of a table should not be allowed | Major | master |
| [HBASE-13813](https://issues.apache.org/jira/browse/HBASE-13813) | Fix Javadoc warnings in Procedure.java | Minor | documentation |
| [HBASE-13776](https://issues.apache.org/jira/browse/HBASE-13776) | Setting illegal versions for HColumnDescriptor does not throw IllegalArgumentException | Major | API |
| [HBASE-13802](https://issues.apache.org/jira/browse/HBASE-13802) | Procedure V2: Master fails to come up due to rollback of create namespace table | Major | master, proc-v2 |
| [HBASE-13796](https://issues.apache.org/jira/browse/HBASE-13796) | ZKUtil doesn't clean quorum setting properly | Minor | . |
| [HBASE-13800](https://issues.apache.org/jira/browse/HBASE-13800) | TestStore#testDeleteExpiredStoreFiles should create unique data/log directory for each call | Minor | test |
| [HBASE-13797](https://issues.apache.org/jira/browse/HBASE-13797) | Fix resource leak in HBaseFsck | Minor | . |
| [HBASE-13801](https://issues.apache.org/jira/browse/HBASE-13801) | Hadoop src checksum is shown instead of HBase src checksum in master / RS UI | Major | UI |
| [HBASE-13723](https://issues.apache.org/jira/browse/HBASE-13723) | In table.rb scanners are never closed. | Major | shell |
| [HBASE-13777](https://issues.apache.org/jira/browse/HBASE-13777) | Table fragmentation display triggers NPE on master status page | Major | UI |
| [HBASE-13778](https://issues.apache.org/jira/browse/HBASE-13778) | BoundedByteBufferPool incorrectly increasing runningAverage buffer length | Major | io, util |
| [HBASE-13732](https://issues.apache.org/jira/browse/HBASE-13732) | TestHBaseFsck#testParallelWithRetriesHbck fails intermittently | Minor | hbck, test |
| [HBASE-13768](https://issues.apache.org/jira/browse/HBASE-13768) | ZooKeeper znodes are bootstrapped with insecure ACLs in a secure configuration | Blocker | security, Zookeeper |
| [HBASE-13767](https://issues.apache.org/jira/browse/HBASE-13767) | Allow ZKAclReset to set and not just clear ZK ACLs | Trivial | Operability, Zookeeper |
| [HBASE-13746](https://issues.apache.org/jira/browse/HBASE-13746) | list\_replicated\_tables command is not listing table in hbase shell. | Major | shell |
| [HBASE-13760](https://issues.apache.org/jira/browse/HBASE-13760) | Cleanup Findbugs keySet iterator warnings | Minor | . |
| [HBASE-13734](https://issues.apache.org/jira/browse/HBASE-13734) | Improper timestamp checking with VisibilityScanDeleteTracker | Major | security |
| [HBASE-13604](https://issues.apache.org/jira/browse/HBASE-13604) | bin/hbase mapredcp does not include yammer-metrics jar | Minor | . |
| [HBASE-13703](https://issues.apache.org/jira/browse/HBASE-13703) | ReplicateContext should not be a member of ReplicationSource | Minor | . |
| [HBASE-13733](https://issues.apache.org/jira/browse/HBASE-13733) | Failed MiniZooKeeperCluster startup did not shutdown ZK servers | Major | Zookeeper |
| [HBASE-13741](https://issues.apache.org/jira/browse/HBASE-13741) | Disable TestRegionObserverInterface#testRecovery and testLegacyRecovery | Minor | . |
| [HBASE-13731](https://issues.apache.org/jira/browse/HBASE-13731) | TestReplicationAdmin should clean up MiniZKCluster resource | Trivial | test |
| [HBASE-13709](https://issues.apache.org/jira/browse/HBASE-13709) | Updates to meta table server columns may be eclipsed | Major | IPC/RPC, regionserver |
| [HBASE-13721](https://issues.apache.org/jira/browse/HBASE-13721) | Improve shell scan performances when using LIMIT | Major | shell |
| [HBASE-13700](https://issues.apache.org/jira/browse/HBASE-13700) | Allow Thrift2 HSHA server to have configurable threads | Major | Thrift |
| [HBASE-13719](https://issues.apache.org/jira/browse/HBASE-13719) | Asynchronous scanner -- cache size-in-bytes bug fix | Major | . |
| [HBASE-13618](https://issues.apache.org/jira/browse/HBASE-13618) | ReplicationSource is too eager to remove sinks | Minor | . |
| [HBASE-13711](https://issues.apache.org/jira/browse/HBASE-13711) | Provide an API to set min and max versions in HColumnDescriptor | Minor | . |
| [HBASE-13722](https://issues.apache.org/jira/browse/HBASE-13722) | Avoid non static method from BloomFilterUtil | Trivial | . |
| [HBASE-13704](https://issues.apache.org/jira/browse/HBASE-13704) | Hbase throws OutOfOrderScannerNextException when MultiRowRangeFilter is used | Major | Client |
| [HBASE-13717](https://issues.apache.org/jira/browse/HBASE-13717) | TestBoundedRegionGroupingProvider#setMembershipDedups need to set HDFS diretory for WAL | Minor | wal |
| [HBASE-13693](https://issues.apache.org/jira/browse/HBASE-13693) | [HBase MOB] Mob files are not encrypting. | Major | mob |
| [HBASE-13694](https://issues.apache.org/jira/browse/HBASE-13694) | CallQueueSize is incorrectly decremented until the response is sent | Major | IPC/RPC, master, regionserver |
| [HBASE-13668](https://issues.apache.org/jira/browse/HBASE-13668) | TestFlushRegionEntry is flaky | Minor | . |
| [HBASE-13699](https://issues.apache.org/jira/browse/HBASE-13699) | Expand information about HBase quotas | Major | documentation |
| [HBASE-13651](https://issues.apache.org/jira/browse/HBASE-13651) | Handle StoreFileScanner FileNotFoundException | Minor | . |
| [HBASE-11830](https://issues.apache.org/jira/browse/HBASE-11830) | TestReplicationThrottler.testThrottling failed on virtual boxes | Minor | test |
| [HBASE-13663](https://issues.apache.org/jira/browse/HBASE-13663) | HMaster fails to restart 'HMaster: Failed to become active master' | Major | hbase |
| [HBASE-13217](https://issues.apache.org/jira/browse/HBASE-13217) | Procedure fails due to ZK issue | Major | . |
| [HBASE-13662](https://issues.apache.org/jira/browse/HBASE-13662) | RSRpcService.scan() throws an OutOfOrderScannerNext if the scan has a retriable failure | Major | IPC/RPC, regionserver |
| [HBASE-13533](https://issues.apache.org/jira/browse/HBASE-13533) | section on configuring ~/.m2/settings.xml has no anchor | Trivial | documentation |
| [HBASE-13661](https://issues.apache.org/jira/browse/HBASE-13661) | Correct binary compatibility issues discovered in 1.1.0RC0 | Major | . |
| [HBASE-13606](https://issues.apache.org/jira/browse/HBASE-13606) | AssignmentManager.assign() is not sync in both path | Major | Region Assignment |
| [HBASE-13635](https://issues.apache.org/jira/browse/HBASE-13635) | Regions stuck in transition because master is incorrectly assumed dead | Major | master, regionserver |
| [HBASE-13634](https://issues.apache.org/jira/browse/HBASE-13634) | Avoid unsafe reference equality checks to EMPTY byte[] | Major | Compaction, Scanners |
| [HBASE-1989](https://issues.apache.org/jira/browse/HBASE-1989) | Admin (et al.) not accurate with Column vs. Column-Family usage | Minor | Client |
| [HBASE-13580](https://issues.apache.org/jira/browse/HBASE-13580) | region\_mover.rb broken with TypeError: no public constructors for Java::OrgApacheHadoopHbaseClient::HTable | Major | scripts |
| [HBASE-13611](https://issues.apache.org/jira/browse/HBASE-13611) | update clover to work for current versions | Minor | build |
| [HBASE-13653](https://issues.apache.org/jira/browse/HBASE-13653) | Uninitialized HRegionServer#walFactory may result in NullPointerException at region server startup​ | Major | hbase |
| [HBASE-13612](https://issues.apache.org/jira/browse/HBASE-13612) | TestRegionFavoredNodes doesn't guard against setup failure | Minor | test |
| [HBASE-13649](https://issues.apache.org/jira/browse/HBASE-13649) | CellComparator.compareTimestamps javadoc inconsistent and wrong | Minor | documentation |
| [HBASE-13648](https://issues.apache.org/jira/browse/HBASE-13648) | test-patch.sh should ignore 'protobuf.generated' | Minor | build |
| [HBASE-13630](https://issues.apache.org/jira/browse/HBASE-13630) | Remove dead code in BufferedDataEncoder | Minor | . |
| [HBASE-13576](https://issues.apache.org/jira/browse/HBASE-13576) | HBCK enhancement: Failure in checking one region should not fail the entire HBCK operation. | Major | hbck |
| [HBASE-13625](https://issues.apache.org/jira/browse/HBASE-13625) | Use HDFS for HFileOutputFormat2 partitioner's path | Major | mapreduce |
| [HBASE-13633](https://issues.apache.org/jira/browse/HBASE-13633) | draining\_servers.rb broken with NoMethodError: undefined method 'getServerInfo' | Major | scripts |
| [HBASE-13628](https://issues.apache.org/jira/browse/HBASE-13628) | Use AtomicLong as size in BoundedConcurrentLinkedQueue | Major | util |
| [HBASE-13617](https://issues.apache.org/jira/browse/HBASE-13617) | TestReplicaWithCluster.testChangeTable timeout | Major | test |
| [HBASE-13599](https://issues.apache.org/jira/browse/HBASE-13599) | The Example Provided in Section 69: Examples of the Documentation Does Not Compile | Minor | documentation |
| [HBASE-13333](https://issues.apache.org/jira/browse/HBASE-13333) | Renew Scanner Lease without advancing the RegionScanner | Major | . |
| [HBASE-13607](https://issues.apache.org/jira/browse/HBASE-13607) | TestSplitLogManager.testGetPreviousRecoveryMode consistently failing | Minor | test |
| [HBASE-12413](https://issues.apache.org/jira/browse/HBASE-12413) | Mismatch in the equals and hashcode methods of KeyValue | Minor | . |
| [HBASE-13312](https://issues.apache.org/jira/browse/HBASE-13312) | SmallScannerCallable does not increment scan metrics | Major | Client, Scanners |
| [HBASE-13608](https://issues.apache.org/jira/browse/HBASE-13608) | 413 Error with Stargate through Knox, using AD, SPNEGO, and Pre-Auth | Major | REST |
| [HBASE-13601](https://issues.apache.org/jira/browse/HBASE-13601) | Connection leak during log splitting | Major | wal |
| [HBASE-13600](https://issues.apache.org/jira/browse/HBASE-13600) | check\_compatibility.sh should ignore shaded jars | Minor | build |
| [HBASE-13595](https://issues.apache.org/jira/browse/HBASE-13595) | Fix Javadoc warn induced in Bytes.java | Trivial | . |
| [HBASE-13564](https://issues.apache.org/jira/browse/HBASE-13564) | Master MBeans are not published | Major | master, metrics |
| [HBASE-13596](https://issues.apache.org/jira/browse/HBASE-13596) | src assembly does not build | Major | build |
| [HBASE-13594](https://issues.apache.org/jira/browse/HBASE-13594) | MultiRowRangeFilter shouldn't call HBaseZeroCopyByteString.wrap() directly | Major | . |
| [HBASE-13577](https://issues.apache.org/jira/browse/HBASE-13577) | Documentation is pointing to wrong port for Master Web UI | Minor | documentation |
| [HBASE-13585](https://issues.apache.org/jira/browse/HBASE-13585) | HRegionFileSystem#splitStoreFile() finishes without closing the file handle in some situation | Major | regionserver |
| [HBASE-13589](https://issues.apache.org/jira/browse/HBASE-13589) | [WINDOWS] hbase.cmd script is broken | Major | . |
| [HBASE-13417](https://issues.apache.org/jira/browse/HBASE-13417) | batchCoprocessorService() does not handle NULL keys | Minor | Coprocessors |
| [HBASE-13517](https://issues.apache.org/jira/browse/HBASE-13517) | Publish a client artifact with shaded dependencies | Major | . |
| [HBASE-13575](https://issues.apache.org/jira/browse/HBASE-13575) | TestChoreService has to make sure that the opened ChoreService is closed for each unit test | Trivial | . |
| [HBASE-13394](https://issues.apache.org/jira/browse/HBASE-13394) | Failed to recreate a table when quota is enabled | Major | security |
| [HBASE-13490](https://issues.apache.org/jira/browse/HBASE-13490) | foreground daemon start re-executes ulimit output | Minor | scripts |
| [HBASE-13359](https://issues.apache.org/jira/browse/HBASE-13359) | Update ACL matrix to include table owner. | Minor | documentation |
| [HBASE-13149](https://issues.apache.org/jira/browse/HBASE-13149) | HBase MR is broken on Hadoop 2.5+ Yarn | Blocker | . |
| [HBASE-13546](https://issues.apache.org/jira/browse/HBASE-13546) | NPE on region server status page if all masters are down | Major | regionserver |
| [HBASE-13555](https://issues.apache.org/jira/browse/HBASE-13555) | StackServlet produces 500 error | Major | . |
| [HBASE-13523](https://issues.apache.org/jira/browse/HBASE-13523) | API Doumentation formatting is broken | Minor | documentation |
| [HBASE-13528](https://issues.apache.org/jira/browse/HBASE-13528) | A bug on selecting compaction pool | Minor | Compaction |
| [HBASE-13526](https://issues.apache.org/jira/browse/HBASE-13526) | TestRegionServerReportForDuty can be flaky: hang or timeout | Minor | test |
| [HBASE-13527](https://issues.apache.org/jira/browse/HBASE-13527) | The default value for hbase.client.scanner.max.result.size is never actually set on Scans | Major | . |
| [HBASE-13437](https://issues.apache.org/jira/browse/HBASE-13437) | ThriftServer leaks ZooKeeper connections | Major | Thrift |
| [HBASE-13524](https://issues.apache.org/jira/browse/HBASE-13524) | TestReplicationAdmin fails on JDK 1.8 | Major | . |
| [HBASE-13499](https://issues.apache.org/jira/browse/HBASE-13499) | AsyncRpcClient test cases failure in powerpc | Major | IPC/RPC |
| [HBASE-13471](https://issues.apache.org/jira/browse/HBASE-13471) | Fix a possible infinite loop in doMiniBatchMutation | Major | . |
| [HBASE-13520](https://issues.apache.org/jira/browse/HBASE-13520) | NullPointerException in TagRewriteCell | Major | . |
| [HBASE-13482](https://issues.apache.org/jira/browse/HBASE-13482) | Phoenix is failing to scan tables on secure environments. | Major | . |
| [HBASE-13430](https://issues.apache.org/jira/browse/HBASE-13430) | HFiles that are in use by a table cloned from a snapshot may be deleted when that snapshot is deleted | Critical | hbase |
| [HBASE-13491](https://issues.apache.org/jira/browse/HBASE-13491) | Issue in FuzzyRowFilter#getNextForFuzzyRule | Major | Filters |
| [HBASE-13477](https://issues.apache.org/jira/browse/HBASE-13477) | Create metrics on failed requests | Major | . |
| [HBASE-13486](https://issues.apache.org/jira/browse/HBASE-13486) | region\_status.rb broken with NameError: uninitialized constant IOException | Major | scripts |
| [HBASE-13473](https://issues.apache.org/jira/browse/HBASE-13473) | deleted cells come back alive after the stripe compaction | Blocker | Compaction |
| [HBASE-12006](https://issues.apache.org/jira/browse/HBASE-12006) | [JDK 8] KeyStoreTestUtil#generateCertificate fails due to "subject class type invalid" | Minor | . |
| [HBASE-13460](https://issues.apache.org/jira/browse/HBASE-13460) | Revise the MetaLookupPool executor-related defaults (introduced in HBASE-13036) | Major | . |
| [HBASE-13475](https://issues.apache.org/jira/browse/HBASE-13475) | Small spelling mistake in region\_mover#isSuccessfulScan causes NoMethodError | Trivial | scripts |
| [HBASE-13301](https://issues.apache.org/jira/browse/HBASE-13301) | Possible memory leak in BucketCache | Major | BlockCache |
| [HBASE-13457](https://issues.apache.org/jira/browse/HBASE-13457) | SnapshotExistsException doesn't honor the DoNotRetry | Trivial | Client |
| [HBASE-13423](https://issues.apache.org/jira/browse/HBASE-13423) | Remove duplicate entry for hbase.regionserver.regionSplitLimit in hbase-default.xml | Minor | hbase |
| [HBASE-13275](https://issues.apache.org/jira/browse/HBASE-13275) | Setting hbase.security.authorization to false does not disable authorization | Major | security |
| [HBASE-11544](https://issues.apache.org/jira/browse/HBASE-11544) | [Ergonomics] hbase.client.scanner.caching is dogged and will try to return batch even if it means OOME | Critical | . |
| [HBASE-13414](https://issues.apache.org/jira/browse/HBASE-13414) | TestHCM no longer needs to test for JRE 6. | Minor | test |
| [HBASE-13377](https://issues.apache.org/jira/browse/HBASE-13377) | Canary may generate false alarm on the first region when there are many delete markers | Major | monitoring |
| [HBASE-13289](https://issues.apache.org/jira/browse/HBASE-13289) | typo in splitSuccessCount metric | Major | metrics |
| [HBASE-13299](https://issues.apache.org/jira/browse/HBASE-13299) | Add setReturnResults() to Increment, like Append has | Critical | API |
| [HBASE-13410](https://issues.apache.org/jira/browse/HBASE-13410) | Bug in KeyValueUtil.oswrite() for non Keyvalue cases | Major | . |
| [HBASE-13411](https://issues.apache.org/jira/browse/HBASE-13411) | Misleading error message when request size quota limit exceeds | Minor | . |
| [HBASE-13409](https://issues.apache.org/jira/browse/HBASE-13409) | Add categories to uncategorized tests | Trivial | . |
| [HBASE-13374](https://issues.apache.org/jira/browse/HBASE-13374) | Small scanners (with particular configurations) do not return all rows | Blocker | . |
| [HBASE-13406](https://issues.apache.org/jira/browse/HBASE-13406) | TestAccessController is flaky when create is slow | Minor | security, test |
| [HBASE-13397](https://issues.apache.org/jira/browse/HBASE-13397) | Purge duplicate rpc request thread local | Major | IPC/RPC |
| [HBASE-13382](https://issues.apache.org/jira/browse/HBASE-13382) | IntegrationTestBigLinkedList should use SecureRandom | Major | integration tests |
| [HBASE-13385](https://issues.apache.org/jira/browse/HBASE-13385) | TestGenerateDelegationToken is broken with hadoop 2.8.0 | Major | test |
| [HBASE-13388](https://issues.apache.org/jira/browse/HBASE-13388) | Handling NullPointer in ZKProcedureMemberRpcs while getting ZNode data | Minor | . |
| [HBASE-13058](https://issues.apache.org/jira/browse/HBASE-13058) | Hbase shell command 'scan' for non existent table shows unnecessary info for one unrelated existent table. | Trivial | Client |
| [HBASE-13091](https://issues.apache.org/jira/browse/HBASE-13091) | Split ZK Quorum on Master WebUI | Minor | . |
| [HBASE-13384](https://issues.apache.org/jira/browse/HBASE-13384) | Fix Javadoc warnings introduced by HBASE-12972 | Trivial | . |
| [HBASE-13368](https://issues.apache.org/jira/browse/HBASE-13368) | Hash.java is declared as public Interface - but it should be Private | Trivial | . |
| [HBASE-13383](https://issues.apache.org/jira/browse/HBASE-13383) | TestRegionServerObserver.testCoprocessorHooksInRegionsMerge zombie after HBASE-12975 | Major | . |
| [HBASE-13296](https://issues.apache.org/jira/browse/HBASE-13296) | Fix the deletion of acl notify nodes for namespace. | Minor | . |
| [HBASE-12954](https://issues.apache.org/jira/browse/HBASE-12954) | Ability impaired using HBase on multihomed hosts | Minor | . |
| [HBASE-13317](https://issues.apache.org/jira/browse/HBASE-13317) | Region server reportForDuty stuck looping if there is a master change | Major | regionserver |
| [HBASE-13371](https://issues.apache.org/jira/browse/HBASE-13371) | Fix typo in TestAsyncIPC | Major | test |
| [HBASE-13364](https://issues.apache.org/jira/browse/HBASE-13364) | Make using the default javac on by default | Major | build |
| [HBASE-12993](https://issues.apache.org/jira/browse/HBASE-12993) | Use HBase 1.0 interfaces in hbase-thrift | Major | . |
| [HBASE-13262](https://issues.apache.org/jira/browse/HBASE-13262) | ResultScanner doesn't return all rows in Scan | Blocker | Client |
| [HBASE-13357](https://issues.apache.org/jira/browse/HBASE-13357) | If maxTables/maxRegions exceeds quota in a namespace, throw QuotaExceededException | Minor | . |
| [HBASE-13355](https://issues.apache.org/jira/browse/HBASE-13355) | QA bot reports checking javac twice | Minor | . |
| [HBASE-13328](https://issues.apache.org/jira/browse/HBASE-13328) | LoadIncrementalHFile.doBulkLoad(Path,HTable) should handle managed connections | Major | . |
| [HBASE-13295](https://issues.apache.org/jira/browse/HBASE-13295) | TestInfoServers hang | Major | test |
| [HBASE-8725](https://issues.apache.org/jira/browse/HBASE-8725) | Add total time RPC call metrics | Major | metrics |
| [HBASE-13265](https://issues.apache.org/jira/browse/HBASE-13265) | Make thrift2 usable from c++ | Major | . |
| [HBASE-13326](https://issues.apache.org/jira/browse/HBASE-13326) | Disabled table can't be enabled after HBase is restarted | Blocker | . |
| [HBASE-13325](https://issues.apache.org/jira/browse/HBASE-13325) | Protocol Buffers 2.5 no longer available for download on code.google.com | Major | . |
| [HBASE-13294](https://issues.apache.org/jira/browse/HBASE-13294) | Fix the critical ancient loopholes in security testing infrastructure. | Major | . |
| [HBASE-13311](https://issues.apache.org/jira/browse/HBASE-13311) | TestQuotaThrottle flaky on slow machine | Minor | test |
| [HBASE-13305](https://issues.apache.org/jira/browse/HBASE-13305) | Get(Get get) is not copying the row key | Major | API |
| [HBASE-13331](https://issues.apache.org/jira/browse/HBASE-13331) | Exceptions from DFS client can cause CatalogJanitor to delete referenced files | Blocker | master |
| [HBASE-13273](https://issues.apache.org/jira/browse/HBASE-13273) | Make Result.EMPTY\_RESULT read-only; currently it can be modified | Major | . |
| [HBASE-13321](https://issues.apache.org/jira/browse/HBASE-13321) | Fix flaky TestHBaseFsck | Minor | test |
| [HBASE-13314](https://issues.apache.org/jira/browse/HBASE-13314) | Fix NPE in HMaster.getClusterStatus() | Minor | . |
| [HBASE-13281](https://issues.apache.org/jira/browse/HBASE-13281) | 'hbase.bucketcache.size' description in hbase book is not correct | Major | documentation |
| [HBASE-13315](https://issues.apache.org/jira/browse/HBASE-13315) | BufferedMutator should be @InterfaceAudience.Public | Major | . |
| [HBASE-13309](https://issues.apache.org/jira/browse/HBASE-13309) | Some tests do not reset EnvironmentEdgeManager | Minor | test |
| [HBASE-13308](https://issues.apache.org/jira/browse/HBASE-13308) | Fix flaky TestEndToEndSplitTransaction | Major | flakey, test |
| [HBASE-13282](https://issues.apache.org/jira/browse/HBASE-13282) | Fix the minor issues of running Canary on kerberized environment | Minor | . |
| [HBASE-12867](https://issues.apache.org/jira/browse/HBASE-12867) | Shell does not support custom replication endpoint specification | Major | . |
| [HBASE-13274](https://issues.apache.org/jira/browse/HBASE-13274) | Fix misplaced deprecation in Delete#addXYZ | Major | API |
| [HBASE-13114](https://issues.apache.org/jira/browse/HBASE-13114) | [UNITTEST] TestEnableTableHandler.testDeleteForSureClearsAllTableRowsFromMeta | Major | test |
| [HBASE-13285](https://issues.apache.org/jira/browse/HBASE-13285) | Fix flaky getRegions() in TestAccessController.setUp() | Minor | test |
| [HBASE-13188](https://issues.apache.org/jira/browse/HBASE-13188) | java.lang.ArithmeticException issue in BoundedByteBufferPool.putBuffer | Major | . |
| [HBASE-13200](https://issues.apache.org/jira/browse/HBASE-13200) | Improper configuration can leads to endless lease recovery during failover | Major | MTTR |
| [HBASE-13253](https://issues.apache.org/jira/browse/HBASE-13253) | LoadIncrementalHFiles unify hfiles discovery | Major | Client, mapreduce |
| [HBASE-13229](https://issues.apache.org/jira/browse/HBASE-13229) | Specify bash for local-regionservers.sh and local-master-backup.sh | Minor | scripts |
| [HBASE-13176](https://issues.apache.org/jira/browse/HBASE-13176) | Flakey TestZooKeeper test. | Major | . |
| [HBASE-13093](https://issues.apache.org/jira/browse/HBASE-13093) | Local mode HBase instance doesn't shut down. | Major | . |
| [HBASE-12908](https://issues.apache.org/jira/browse/HBASE-12908) | Typos in MemStoreFlusher javadocs | Trivial | documentation |
| [HBASE-13254](https://issues.apache.org/jira/browse/HBASE-13254) | EnableTableHandler#prepare would not throw TableNotFoundException during recovery | Minor | . |
| [HBASE-13193](https://issues.apache.org/jira/browse/HBASE-13193) | RegionScannerImpl filters should not be reset if a partial Result is returned | Major | . |
| [HBASE-13246](https://issues.apache.org/jira/browse/HBASE-13246) | Correct the assertion for namespace permissions in tearDown method of TestAccessController | Minor | security, test |
| [HBASE-13239](https://issues.apache.org/jira/browse/HBASE-13239) | HBase grant at specific column level does not work for Groups | Major | hbase |
| [HBASE-13242](https://issues.apache.org/jira/browse/HBASE-13242) | TestPerColumnFamilyFlush.testFlushingWhenLogRolling hung | Major | test |
| [HBASE-13227](https://issues.apache.org/jira/browse/HBASE-13227) | LoadIncrementalHFile should skip non-files inside a possible family-dir | Minor | Client, mapreduce |
| [HBASE-13232](https://issues.apache.org/jira/browse/HBASE-13232) | ConnectionManger : Batch pool threads and metaLookup pool threads should use different name pattern | Trivial | . |
| [HBASE-13097](https://issues.apache.org/jira/browse/HBASE-13097) | Use same EventLoopGroup for different AsyncRpcClients if possible | Major | IPC/RPC, test |
| [HBASE-13136](https://issues.apache.org/jira/browse/HBASE-13136) | TestSplitLogManager.testGetPreviousRecoveryMode is flakey | Major | . |
| [HBASE-13224](https://issues.apache.org/jira/browse/HBASE-13224) | Minor formatting issue when logging a namespace scope in AuthResult#toContextString | Trivial | Coprocessors, security |
| [HBASE-13194](https://issues.apache.org/jira/browse/HBASE-13194) | TableNamespaceManager not ready cause MasterQuotaManager initialization fail | Major | master |
| [HBASE-13218](https://issues.apache.org/jira/browse/HBASE-13218) | Correct the syntax shown for using ExportSnapshot tool in the book | Minor | documentation |
| [HBASE-13167](https://issues.apache.org/jira/browse/HBASE-13167) | The check for balancerCutoffTime is buggy | Trivial | Balancer |
| [HBASE-13192](https://issues.apache.org/jira/browse/HBASE-13192) | IntegrationTestBulkLoad doesn't wait for table modification sometimes leading to spurious test failures | Major | . |
| [HBASE-13191](https://issues.apache.org/jira/browse/HBASE-13191) | mvn site fails on jenkins due to permgen | Major | . |
| [HBASE-13208](https://issues.apache.org/jira/browse/HBASE-13208) | Patch build should match the patch filename and not the whole relative URL in findBranchNameFromPatchName | Trivial | . |
| [HBASE-13206](https://issues.apache.org/jira/browse/HBASE-13206) | Fix TableLock tableName log format | Trivial | . |
| [HBASE-13165](https://issues.apache.org/jira/browse/HBASE-13165) | Fix docs and scripts for default max heaps size after HBASE-11804 | Minor | documentation, scripts |
| [HBASE-13174](https://issues.apache.org/jira/browse/HBASE-13174) | Apply HBASE-11804 to Windows scripts | Major | scripts |
| [HBASE-13196](https://issues.apache.org/jira/browse/HBASE-13196) | Add info about default number of versions when using the export tool | Major | documentation |
| [HBASE-13181](https://issues.apache.org/jira/browse/HBASE-13181) | TestHRegionReplayEvents.testReplayBulkLoadEvent fails frequently. | Minor | . |
| [HBASE-13186](https://issues.apache.org/jira/browse/HBASE-13186) | HBase build error due to checkstyle | Major | build |
| [HBASE-12931](https://issues.apache.org/jira/browse/HBASE-12931) | The existing KeyValues in memstore are not removed completely after inserting cell into memStore | Minor | . |
| [HBASE-12723](https://issues.apache.org/jira/browse/HBASE-12723) | Update ACL matrix to reflect reality | Major | . |
| [HBASE-13023](https://issues.apache.org/jira/browse/HBASE-13023) | Document multiWAL | Major | documentation, wal |
| [HBASE-12468](https://issues.apache.org/jira/browse/HBASE-12468) | AUTHORIZATIONS should be part of Visibility Label Docs | Major | documentation |
| [HBASE-13135](https://issues.apache.org/jira/browse/HBASE-13135) | Move replication ops mgmt stuff from Javadoc to Ref Guide | Major | documentation, Replication |
| [HBASE-12969](https://issues.apache.org/jira/browse/HBASE-12969) | Parameter Validation is not there for shell script, local-master-backup.sh and local-regionservers.sh | Minor | scripts |
| [HBASE-13084](https://issues.apache.org/jira/browse/HBASE-13084) | Add labels to VisibilityLabelsCache asynchronously causes TestShell flakey | Major | test |
| [HBASE-13150](https://issues.apache.org/jira/browse/HBASE-13150) | TestMasterObserver failing disable table at end of test | Major | test |
| [HBASE-13163](https://issues.apache.org/jira/browse/HBASE-13163) | Add HBase version to header and footer of HTML and PDF docs | Major | documentation |
| [HBASE-13076](https://issues.apache.org/jira/browse/HBASE-13076) | Table can be forcibly enabled in AssignmentManager during table disabling. | Major | master, Region Assignment |
| [HBASE-13155](https://issues.apache.org/jira/browse/HBASE-13155) | Fix TestPrefixTree | Major | test |
| [HBASE-13156](https://issues.apache.org/jira/browse/HBASE-13156) | Fix minor rat violation recently introduced (asciidoctor.css). | Major | . |
| [HBASE-13052](https://issues.apache.org/jira/browse/HBASE-13052) | Explain each region split policy | Major | documentation |
| [HBASE-13146](https://issues.apache.org/jira/browse/HBASE-13146) | Race Condition in ScheduledChore and ChoreService | Major | regionserver |
| [HBASE-13145](https://issues.apache.org/jira/browse/HBASE-13145) | TestNamespaceAuditor.testRegionMerge is flaky | Major | test |
| [HBASE-13139](https://issues.apache.org/jira/browse/HBASE-13139) | Clean up missing JAVA\_HOME message in bin/hbase-config.sh | Trivial | shell |
| [HBASE-13115](https://issues.apache.org/jira/browse/HBASE-13115) | Fix the usage of remote user in thrift doAs implementation. | Major | . |
| [HBASE-13141](https://issues.apache.org/jira/browse/HBASE-13141) | IntegrationTestAcidGuarantees returns incorrect values for getColumnFamilies | Major | integration tests |
| [HBASE-13134](https://issues.apache.org/jira/browse/HBASE-13134) | mutateRow and checkAndMutate apis don't throw region level exceptions | Major | . |
| [HBASE-13123](https://issues.apache.org/jira/browse/HBASE-13123) | Minor bug in ROW bloom filter | Minor | . |
| [HBASE-13133](https://issues.apache.org/jira/browse/HBASE-13133) | NPE when running TestSplitLogManager | Major | . |
| [HBASE-13131](https://issues.apache.org/jira/browse/HBASE-13131) | ReplicationAdmin leaks connections if there's an error in the constructor | Critical | Replication |
| [HBASE-12924](https://issues.apache.org/jira/browse/HBASE-12924) | HRegionServer#MovedRegionsCleaner Chore does not start | Minor | . |
| [HBASE-13119](https://issues.apache.org/jira/browse/HBASE-13119) | FileLink should implement equals | Major | . |
| [HBASE-13112](https://issues.apache.org/jira/browse/HBASE-13112) | quota.rb, security.rb and visibility\_labels.rb leak connection | Major | shell |
| [HBASE-13111](https://issues.apache.org/jira/browse/HBASE-13111) | truncate\_preserve command is failing with undefined method error | Major | shell |
| [HBASE-13102](https://issues.apache.org/jira/browse/HBASE-13102) | Fix Pseudo-distributed Mode which was broken in 1.0.0 | Major | . |
| [HBASE-13048](https://issues.apache.org/jira/browse/HBASE-13048) | Use hbase.crypto.wal.algorithm in SecureProtobufLogReader while decrypting the data | Minor | . |
| [HBASE-13085](https://issues.apache.org/jira/browse/HBASE-13085) | Security issue in the implementation of Rest gataway 'doAs' proxy user support | Critical | REST, security |
| [HBASE-13077](https://issues.apache.org/jira/browse/HBASE-13077) | BoundedCompletionService doesn't pass trace info to server | Major | hbase |
| [HBASE-13083](https://issues.apache.org/jira/browse/HBASE-13083) | Master can be dead-locked while assigning META. | Major | master, Region Assignment |
| [HBASE-12953](https://issues.apache.org/jira/browse/HBASE-12953) | RegionServer is not functionally working with AysncRpcClient in secure mode | Critical | security |
| [HBASE-13001](https://issues.apache.org/jira/browse/HBASE-13001) | NullPointer in master logs for table.jsp | Trivial | . |
| [HBASE-13032](https://issues.apache.org/jira/browse/HBASE-13032) | Migration of states should be performed once META is assigned and onlined. | Major | . |
| [HBASE-13070](https://issues.apache.org/jira/browse/HBASE-13070) | Fix possibly zero length family and qualifier is TestCacheOnWrite | Major | test |
| [HBASE-13081](https://issues.apache.org/jira/browse/HBASE-13081) | Branch precommit builds are not updating to branch head before patch application | Major | . |
| [HBASE-13069](https://issues.apache.org/jira/browse/HBASE-13069) | Thrift Http Server returns an error code of 500 instead of 401 when authentication fails | Minor | . |
| [HBASE-13072](https://issues.apache.org/jira/browse/HBASE-13072) | BucketCache.evictBlock returns true if block does not exist | Major | BlockCache |
| [HBASE-13075](https://issues.apache.org/jira/browse/HBASE-13075) | TableInputFormatBase spuriously warning about multiple initializeTable calls | Minor | mapreduce |
| [HBASE-13036](https://issues.apache.org/jira/browse/HBASE-13036) | Meta scanner should use its own threadpool | Major | . |
| [HBASE-13065](https://issues.apache.org/jira/browse/HBASE-13065) | Increasing -Xmx when running TestDistributedLogSplitting | Major | test |
| [HBASE-13066](https://issues.apache.org/jira/browse/HBASE-13066) | Fix typo in AsyncRpcChannel | Major | IPC/RPC |
| [HBASE-12102](https://issues.apache.org/jira/browse/HBASE-12102) | Duplicate keys in HBase.RegionServer metrics JSON | Minor | . |
| [HBASE-13061](https://issues.apache.org/jira/browse/HBASE-13061) | RegionStates can remove wrong region from server holdings | Major | Region Assignment |
| [HBASE-13050](https://issues.apache.org/jira/browse/HBASE-13050) | Hbase shell create\_namespace command throws ArrayIndexOutOfBoundException for (invalid) empty text input. | Trivial | . |
| [HBASE-12948](https://issues.apache.org/jira/browse/HBASE-12948) | Calling Increment#addColumn on the same column multiple times produces wrong result | Critical | Client, regionserver |
| [HBASE-13040](https://issues.apache.org/jira/browse/HBASE-13040) | Possible failure of TestHMasterRPCException | Major | test |
| [HBASE-13055](https://issues.apache.org/jira/browse/HBASE-13055) | HRegion FIXED\_OVERHEAD missed one boolean | Major | . |
| [HBASE-12412](https://issues.apache.org/jira/browse/HBASE-12412) | update the ref guide(currently Example 10.2) to show "update an existing CF" with the new API modifyFamily in master | Minor | documentation |
| [HBASE-13041](https://issues.apache.org/jira/browse/HBASE-13041) | TestEnableTableHandler should not call AssignmentManager#assign concurrently with master | Major | integration tests |
| [HBASE-13047](https://issues.apache.org/jira/browse/HBASE-13047) | Add "HBase Configuration" link missing on the table details pages | Trivial | Operability |
| [HBASE-13011](https://issues.apache.org/jira/browse/HBASE-13011) | TestLoadIncrementalHFiles is flakey when using AsyncRpcClient as client implementation | Major | . |
| [HBASE-13049](https://issues.apache.org/jira/browse/HBASE-13049) | wal\_roll ruby command doesn't work. | Major | shell |
| [HBASE-13029](https://issues.apache.org/jira/browse/HBASE-13029) | Table state should be deleted from META as a last operation in DeleteTableHandler | Major | master |
| [HBASE-13007](https://issues.apache.org/jira/browse/HBASE-13007) | Fix the test timeouts being caused by ChoreService | Major | . |
| [HBASE-12920](https://issues.apache.org/jira/browse/HBASE-12920) | hadoopqa should compile with different hadoop versions | Major | . |
| [HBASE-12999](https://issues.apache.org/jira/browse/HBASE-12999) | Make foreground\_start return the correct exit code | Major | shell |
| [HBASE-13004](https://issues.apache.org/jira/browse/HBASE-13004) | Make possible to explain why HBaseTestingUtility.waitFor fails | Minor | test |
| [HBASE-12961](https://issues.apache.org/jira/browse/HBASE-12961) | Negative values in read and write region server metrics | Minor | regionserver |
| [HBASE-12964](https://issues.apache.org/jira/browse/HBASE-12964) | Add the ability for hbase-daemon.sh to start in the foreground | Major | . |
| [HBASE-7332](https://issues.apache.org/jira/browse/HBASE-7332) | [webui] HMaster webui should display the number of regions a table has. | Minor | UI |
| [HBASE-12951](https://issues.apache.org/jira/browse/HBASE-12951) | TestHCM.testConnectionClose is flakey when using AsyncRpcClient as client implementation | Major | IPC/RPC |
| [HBASE-12877](https://issues.apache.org/jira/browse/HBASE-12877) | Hbase documentation- a referenced link is not working | Minor | documentation |
| [HBASE-12922](https://issues.apache.org/jira/browse/HBASE-12922) | Post-asciidoc conversion fix-ups part 2 | Major | documentation |
| [HBASE-12902](https://issues.apache.org/jira/browse/HBASE-12902) | Post-asciidoc conversion fix-ups | Major | documentation |
| [HBASE-12903](https://issues.apache.org/jira/browse/HBASE-12903) | Fix configuration which enables secure bulk load | Major | Coprocessors, documentation |
| [HBASE-12871](https://issues.apache.org/jira/browse/HBASE-12871) | Document JDK versions supported by each release missing in new documentation | Minor | documentation |
| [HBASE-12845](https://issues.apache.org/jira/browse/HBASE-12845) | ByteBufferOutputStream should grow as direct buffer if the initial buffer is also direct BB | Minor | . |
| [HBASE-12858](https://issues.apache.org/jira/browse/HBASE-12858) | Remove unneeded files under src/main/docbkx | Major | documentation |
| [HBASE-11983](https://issues.apache.org/jira/browse/HBASE-11983) | HRegion constructors should not create HLog | Major | wal |
| [HBASE-12849](https://issues.apache.org/jira/browse/HBASE-12849) | LoadIncrementalHFiles should use unmanaged connection in branch-1 | Major | mapreduce |
| [HBASE-12777](https://issues.apache.org/jira/browse/HBASE-12777) | Multi-page book has broken links that work in the single-page version | Major | documentation |
| [HBASE-12838](https://issues.apache.org/jira/browse/HBASE-12838) | After HBASE-5162 RSRpcServices accidentally applies mutations twice | Major | . |
| [HBASE-12775](https://issues.apache.org/jira/browse/HBASE-12775) | CompressionTest ate my HFile (sigh!) | Major | test |
| [HBASE-12772](https://issues.apache.org/jira/browse/HBASE-12772) | TestPerColumnFamilyFlush failing | Major | test |
| [HBASE-12749](https://issues.apache.org/jira/browse/HBASE-12749) | Tighten HFileLink api to enable non-snapshot uses | Major | snapshots |
| [HBASE-12734](https://issues.apache.org/jira/browse/HBASE-12734) | TestPerColumnFamilyFlush.testCompareStoreFileCount is flakey | Minor | . |
| [HBASE-12703](https://issues.apache.org/jira/browse/HBASE-12703) | Cleanup TestClientPushback for repeatability | Minor | test |
| [HBASE-12688](https://issues.apache.org/jira/browse/HBASE-12688) | Update site with a bootstrap-based UI | Major | website |
| [HBASE-12682](https://issues.apache.org/jira/browse/HBASE-12682) | compaction thread throttle value is not correct in hbase-default.xml | Major | regionserver |
| [HBASE-12690](https://issues.apache.org/jira/browse/HBASE-12690) | list\_quotas command is failing with not able to load Java class | Major | shell |
| [HBASE-12687](https://issues.apache.org/jira/browse/HBASE-12687) | Book is missing styling | Major | documentation |
| [HBASE-12693](https://issues.apache.org/jira/browse/HBASE-12693) | [docs] nit fix in HBase and MapReduce section | Major | documentation |
| [HBASE-12677](https://issues.apache.org/jira/browse/HBASE-12677) | Update replication docs to clarify terminology | Major | documentation |
| [HBASE-9763](https://issues.apache.org/jira/browse/HBASE-9763) | Scan javadoc doesn't fully capture semantics of start and stop row | Minor | documentation |
| [HBASE-11153](https://issues.apache.org/jira/browse/HBASE-11153) | Document that http webUI's should redirect to https when enabled | Minor | documentation, master, regionserver, UI |
| [HBASE-12540](https://issues.apache.org/jira/browse/HBASE-12540) | TestRegionServerMetrics#testMobMetrics test failure | Major | test |
| [HBASE-12628](https://issues.apache.org/jira/browse/HBASE-12628) | Update instructions for running shell tests using maven. | Minor | documentation, shell |
| [HBASE-12553](https://issues.apache.org/jira/browse/HBASE-12553) | request value is not consistent for restoreSnapshot in audit logs | Minor | security |
| [HBASE-12548](https://issues.apache.org/jira/browse/HBASE-12548) | Improve debuggability of IntegrationTestTimeBoundedRequestsWithRegionReplicas | Minor | . |
| [HBASE-12603](https://issues.apache.org/jira/browse/HBASE-12603) | Remove javadoc warnings introduced due to removal of unused imports | Major | . |
| [HBASE-12474](https://issues.apache.org/jira/browse/HBASE-12474) | Incorrect handling of default namespace in user\_permission command. | Minor | . |
| [HBASE-12552](https://issues.apache.org/jira/browse/HBASE-12552) | listSnapshots should list only owned snapshots for non-super user | Major | snapshots |
| [HBASE-12073](https://issues.apache.org/jira/browse/HBASE-12073) | Shell command user\_permission fails on the table created by user if he is not global admin. | Minor | . |
| [HBASE-12535](https://issues.apache.org/jira/browse/HBASE-12535) | NPE in WALFactory close under contention for getInstance | Major | Replication, wal |
| [HBASE-12532](https://issues.apache.org/jira/browse/HBASE-12532) | TestFilter failing occasionally with ExitCodeException doing chmod since HBASE-10378 | Major | test |
| [HBASE-12421](https://issues.apache.org/jira/browse/HBASE-12421) | Clarify ACL concepts and best practices | Major | documentation, security |
| [HBASE-12488](https://issues.apache.org/jira/browse/HBASE-12488) | Small bug in publish\_hbase\_website.sh script | Minor | scripts |
| [HBASE-12347](https://issues.apache.org/jira/browse/HBASE-12347) | Fix the edge case where Hadoop QA's parsing of attached patches breaks the JIRA status checker in dev-support/rebase\_all\_git\_branches.sh | Minor | scripts |
| [HBASE-12409](https://issues.apache.org/jira/browse/HBASE-12409) | Add actual tunable parameters for finding optimal # of regions per RS | Major | documentation, Performance |
| [HBASE-12397](https://issues.apache.org/jira/browse/HBASE-12397) | CopyTable fails to compile with the Hadoop 1 profile | Major | . |
| [HBASE-12418](https://issues.apache.org/jira/browse/HBASE-12418) | Multiple branches for MOB feature breaking git for case insensitive filesystems | Blocker | . |
| [HBASE-12380](https://issues.apache.org/jira/browse/HBASE-12380) | TestRegionServerNoMaster#testMultipleOpen is flaky after HBASE-11760 | Major | test |
| [HBASE-12326](https://issues.apache.org/jira/browse/HBASE-12326) | Document scanner timeout workarounds in troubleshooting section | Major | documentation |
| [HBASE-12283](https://issues.apache.org/jira/browse/HBASE-12283) | Clean up some checkstyle errors | Major | . |
| [HBASE-12307](https://issues.apache.org/jira/browse/HBASE-12307) | Remove unused Imports in hbase-client and hbase-common | Minor | . |
| [HBASE-12192](https://issues.apache.org/jira/browse/HBASE-12192) | Remove EventHandlerListener | Major | master |
| [HBASE-12186](https://issues.apache.org/jira/browse/HBASE-12186) | Formatting error in Table 8.2. Examples of Visibility Expressions | Major | documentation |
| [HBASE-12216](https://issues.apache.org/jira/browse/HBASE-12216) | Lower closed region logging level | Minor | . |
| [HBASE-12201](https://issues.apache.org/jira/browse/HBASE-12201) | Close the writers in the MOB sweep tool | Minor | . |
| [HBASE-11998](https://issues.apache.org/jira/browse/HBASE-11998) | Document a workflow for cherry-picking a fix to a different branch | Major | documentation |
| [HBASE-12193](https://issues.apache.org/jira/browse/HBASE-12193) | Add missing docbook file to git | Major | documentation |
| [HBASE-12172](https://issues.apache.org/jira/browse/HBASE-12172) | Disable flakey TestRegionReplicaReplicationEndpoint and make fixing it a blocker on 1.0 | Major | test |
| [HBASE-11957](https://issues.apache.org/jira/browse/HBASE-11957) | Backport to 0.94 HBASE-5974 Scanner retry behavior with RPC timeout on next() seems incorrect | Critical | . |
| [HBASE-12030](https://issues.apache.org/jira/browse/HBASE-12030) | Wrong compaction report and assert when MOB compaction switches to minor | Critical | Compaction, regionserver |
| [HBASE-12005](https://issues.apache.org/jira/browse/HBASE-12005) | Split/merge fails if master restarts before PONR | Major | . |
| [HBASE-12027](https://issues.apache.org/jira/browse/HBASE-12027) | The ZooKeeperWatcher in HMobStore only uses the default conf | Major | . |
| [HBASE-11987](https://issues.apache.org/jira/browse/HBASE-11987) | Make zk-less table states backward compatible. | Major | . |
| [HBASE-11968](https://issues.apache.org/jira/browse/HBASE-11968) | If MOB is enabled, it should make sure hfile v3 is being used. | Major | . |
| [HBASE-11721](https://issues.apache.org/jira/browse/HBASE-11721) | jdiff script no longer works as usage instructions indicate | Major | scripts |
| [HBASE-8674](https://issues.apache.org/jira/browse/HBASE-8674) | JUnit and Surefire TRUNK-HBASE-2 plugins need a new home | Major | build |
| [HBASE-11855](https://issues.apache.org/jira/browse/HBASE-11855) | HBase handbook chapter 18.9 out of date | Minor | documentation |
| [HBASE-11689](https://issues.apache.org/jira/browse/HBASE-11689) | Track meta in transition | Major | Region Assignment |
| [HBASE-11834](https://issues.apache.org/jira/browse/HBASE-11834) | TestHRegionBusyWait.testParallelAppendWithMemStoreFlush fails sporadically | Major | test |
| [HBASE-11732](https://issues.apache.org/jira/browse/HBASE-11732) | Should not preemptively offline a region | Major | Region Assignment |
| [HBASE-11658](https://issues.apache.org/jira/browse/HBASE-11658) | Piped commands to hbase shell should return non-zero if shell command failed. | Major | shell |
| [HBASE-11333](https://issues.apache.org/jira/browse/HBASE-11333) | Remove deprecated class MetaMigrationConvertingToPB | Trivial | master |
| [HBASE-11661](https://issues.apache.org/jira/browse/HBASE-11661) | Quickstart chapter claims standalone mode has multiple processes | Minor | documentation |
| [HBASE-11629](https://issues.apache.org/jira/browse/HBASE-11629) | Operational concerns for Replication should call out ZooKeeper | Major | documentation, Replication |
| [HBASE-11640](https://issues.apache.org/jira/browse/HBASE-11640) | Add syntax highlighting support to HBase Ref Guide programlistings | Major | documentation |
| [HBASE-11648](https://issues.apache.org/jira/browse/HBASE-11648) | Typo of config: hbase.hstore.compaction.ratio in book.xml | Minor | Compaction |
| [HBASE-11539](https://issues.apache.org/jira/browse/HBASE-11539) | Expand info about contributing to and building documentation | Major | documentation |
| [HBASE-11316](https://issues.apache.org/jira/browse/HBASE-11316) | Expand info about compactions beyond HBASE-11120 | Major | Compaction, documentation |
| [HBASE-11522](https://issues.apache.org/jira/browse/HBASE-11522) | Move Replication information into the Ref Guide | Major | documentation |
| [HBASE-11560](https://issues.apache.org/jira/browse/HBASE-11560) | hbase.regionserver.global.memstore.size is documented twice | Major | . |
| [HBASE-11529](https://issues.apache.org/jira/browse/HBASE-11529) | Images and CSS still don't work properly on both html and html-single book | Major | documentation |
| [HBASE-11521](https://issues.apache.org/jira/browse/HBASE-11521) | Modify pom.xml to copy the images/ and css/ directories to the right location for the Ref Guide to see them correctly | Critical | documentation |
| [HBASE-8473](https://issues.apache.org/jira/browse/HBASE-8473) | add note to ref guide about snapshots and ec2 reverse dns requirements. | Major | documentation, snapshots |
| [HBASE-11499](https://issues.apache.org/jira/browse/HBASE-11499) | AsyncProcess.buildDetailedErrorMessage concatenates strings using + in a loop | Trivial | Client |
| [HBASE-11500](https://issues.apache.org/jira/browse/HBASE-11500) | Possible null pointer dereference of regionLocation in ReversedScannerCallable | Minor | Client |
### TESTS:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-20228](https://issues.apache.org/jira/browse/HBASE-20228) | [Umbrella] Verify 1.2.7 shell works against 2.0.0 server | Blocker | shell |
| [HBASE-20272](https://issues.apache.org/jira/browse/HBASE-20272) | TestAsyncTable#testCheckAndMutateWithTimeRange fails due to TableExistsException | Major | . |
| [HBASE-20107](https://issues.apache.org/jira/browse/HBASE-20107) | Add a test case for HBASE-14317 | Minor | wal |
| [HBASE-20052](https://issues.apache.org/jira/browse/HBASE-20052) | TestRegionOpen#testNonExistentRegionReplica fails due to NPE | Major | . |
| [HBASE-20031](https://issues.apache.org/jira/browse/HBASE-20031) | Unable to run integration test using mvn due to missing HBaseClassTestRule | Major | . |
| [HBASE-19949](https://issues.apache.org/jira/browse/HBASE-19949) | TestRSGroupsWithACL fails with ExceptionInInitializerError | Major | . |
| [HBASE-19869](https://issues.apache.org/jira/browse/HBASE-19869) | Wrong class name used in TestLockManager | Trivial | . |
| [HBASE-19832](https://issues.apache.org/jira/browse/HBASE-19832) | TestConfServlet#testWriteJson fails against hadoop3 due to spelling change | Minor | . |
| [HBASE-19514](https://issues.apache.org/jira/browse/HBASE-19514) | Use random port for TestJMXListener | Minor | . |
| [HBASE-19289](https://issues.apache.org/jira/browse/HBASE-19289) | CommonFSUtils$StreamLacksCapabilityException: hflush when running test against hadoop3 beta1 | Critical | . |
| [HBASE-19342](https://issues.apache.org/jira/browse/HBASE-19342) | fix TestTableBasedReplicationSourceManagerImpl#testRemovePeerMetricsCleanup | Major | test |
| [HBASE-19266](https://issues.apache.org/jira/browse/HBASE-19266) | TestAcidGuarantees should cover adaptive in-memory compaction | Minor | . |
| [HBASE-19288](https://issues.apache.org/jira/browse/HBASE-19288) | Intermittent test failure in TestHStore.testRunDoubleMemStoreCompactors | Major | test |
| [HBASE-19299](https://issues.apache.org/jira/browse/HBASE-19299) | Assert only one Connection is constructed when calculating splits in a MultiTableInputFormat | Minor | test |
| [HBASE-19273](https://issues.apache.org/jira/browse/HBASE-19273) | IntegrationTestBulkLoad#installSlowingCoproc() uses read-only HTableDescriptor | Major | . |
| [HBASE-19248](https://issues.apache.org/jira/browse/HBASE-19248) | TestZooKeeper#testMultipleZK fails due to missing method getKeepAliveZooKeeperWatcher | Critical | Zookeeper |
| [HBASE-19237](https://issues.apache.org/jira/browse/HBASE-19237) | TestMaster.testMasterOpsWhileSplitting fails | Major | . |
| [HBASE-16051](https://issues.apache.org/jira/browse/HBASE-16051) | TestScannerHeartbeatMessages fails on some machines | Major | test |
| [HBASE-19026](https://issues.apache.org/jira/browse/HBASE-19026) | TestLockProcedure#testRemoteNamespaceLockRecovery fails in master | Major | . |
| [HBASE-18902](https://issues.apache.org/jira/browse/HBASE-18902) | TestCoprocessorServiceBackwardCompatibility fails | Major | . |
| [HBASE-18632](https://issues.apache.org/jira/browse/HBASE-18632) | TestMultiParallel#testFlushCommitsWithAbort fails in master branch | Major | test |
| [HBASE-18147](https://issues.apache.org/jira/browse/HBASE-18147) | nightly job to check health of active branches | Major | community, test |
| [HBASE-17806](https://issues.apache.org/jira/browse/HBASE-17806) | TestRSGroups#testMoveServersAndTables is flaky in master branch | Major | . |
| [HBASE-17703](https://issues.apache.org/jira/browse/HBASE-17703) | TestThriftServerCmdLine is flaky in master branch | Major | . |
| [HBASE-17672](https://issues.apache.org/jira/browse/HBASE-17672) | "Grant should set access rights appropriately" test fails | Major | . |
| [HBASE-17657](https://issues.apache.org/jira/browse/HBASE-17657) | TestZKAsyncRegistry is flaky | Major | . |
| [HBASE-17628](https://issues.apache.org/jira/browse/HBASE-17628) | Local mode of mini cluster shouldn't use hdfs | Minor | . |
| [HBASE-17474](https://issues.apache.org/jira/browse/HBASE-17474) | Reduce frequency of NoSuchMethodException when calling setStoragePolicy() | Minor | . |
| [HBASE-17371](https://issues.apache.org/jira/browse/HBASE-17371) | Enhance 'HBaseContextSuite @ distributedScan to test HBase client' with filter | Minor | . |
| [HBASE-17246](https://issues.apache.org/jira/browse/HBASE-17246) | TestSerialReplication#testRegionMerge fails in master branch | Major | . |
| [HBASE-17189](https://issues.apache.org/jira/browse/HBASE-17189) | TestMasterObserver#wasModifyTableActionCalled uses wrong variables | Minor | test |
| [HBASE-17080](https://issues.apache.org/jira/browse/HBASE-17080) | rest.TestTableResource fails in master branch | Major | . |
| [HBASE-17120](https://issues.apache.org/jira/browse/HBASE-17120) | TestAssignmentListener#testAssignmentListener fails | Minor | . |
| [HBASE-16975](https://issues.apache.org/jira/browse/HBASE-16975) | Disable two subtests of TestSerialReplication | Minor | . |
| [HBASE-16274](https://issues.apache.org/jira/browse/HBASE-16274) | Add more peer tests to replication\_admin\_test | Minor | . |
| [HBASE-16781](https://issues.apache.org/jira/browse/HBASE-16781) | Fix flaky TestMasterProcedureWalLease | Minor | proc-v2, test |
| [HBASE-16794](https://issues.apache.org/jira/browse/HBASE-16794) | TestDispatchMergingRegionsProcedure#testMergeRegionsConcurrently is flaky | Minor | test |
| [HBASE-16791](https://issues.apache.org/jira/browse/HBASE-16791) | Fix TestDispatchMergingRegionsProcedure | Minor | test |
| [HBASE-16777](https://issues.apache.org/jira/browse/HBASE-16777) | Fix flaky TestMasterProcedureEvents | Trivial | proc-v2, test |
| [HBASE-16778](https://issues.apache.org/jira/browse/HBASE-16778) | Move testIllegalTableDescriptor out from TestFromClientSide | Trivial | test |
| [HBASE-16776](https://issues.apache.org/jira/browse/HBASE-16776) | Remove duplicated versions of countRow() in tests | Trivial | test |
| [HBASE-16725](https://issues.apache.org/jira/browse/HBASE-16725) | Don't let flushThread hang in TestHRegion | Minor | . |
| [HBASE-16671](https://issues.apache.org/jira/browse/HBASE-16671) | Split TestExportSnapshot | Minor | snapshots, test |
| [HBASE-16349](https://issues.apache.org/jira/browse/HBASE-16349) | TestClusterId may hang during cluster shutdown | Minor | . |
| [HBASE-16634](https://issues.apache.org/jira/browse/HBASE-16634) | Speedup TestExportSnapshot | Minor | snapshots, test |
| [HBASE-16639](https://issues.apache.org/jira/browse/HBASE-16639) | TestProcedureInMemoryChore#testChoreAddAndRemove occasionally fails | Minor | . |
| [HBASE-16418](https://issues.apache.org/jira/browse/HBASE-16418) | Reduce duration of sleep waiting for region reopen in IntegrationTestBulkLoad#installSlowingCoproc() | Minor | . |
| [HBASE-16185](https://issues.apache.org/jira/browse/HBASE-16185) | TestReplicationSmallTests fails in master branch | Major | . |
| [HBASE-16049](https://issues.apache.org/jira/browse/HBASE-16049) | TestRowProcessorEndpoint is failing on Apache Builds | Major | . |
| [HBASE-15939](https://issues.apache.org/jira/browse/HBASE-15939) | Two shell test failures on master | Major | . |
| [HBASE-15923](https://issues.apache.org/jira/browse/HBASE-15923) | Shell rows counter test fails | Major | . |
| [HBASE-15760](https://issues.apache.org/jira/browse/HBASE-15760) | TestBlockEvictionFromClient#testParallelGetsAndScanWithWrappedRegionScanner fails in master branch | Minor | . |
| [HBASE-15679](https://issues.apache.org/jira/browse/HBASE-15679) | Assertion on wrong variable in TestReplicationThrottler#testThrottling | Minor | . |
| [HBASE-13372](https://issues.apache.org/jira/browse/HBASE-13372) | Unit tests for SplitTransaction and RegionMergeTransaction listeners | Major | . |
| [HBASE-15420](https://issues.apache.org/jira/browse/HBASE-15420) | TestCacheConfig failed after HBASE-15338 | Minor | test |
| [HBASE-15192](https://issues.apache.org/jira/browse/HBASE-15192) | TestRegionMergeTransactionOnCluster#testCleanMergeReference is flaky | Minor | . |
| [HBASE-14584](https://issues.apache.org/jira/browse/HBASE-14584) | TestNamespacesInstanceModel fails on jdk8 | Major | REST, test |
| [HBASE-14758](https://issues.apache.org/jira/browse/HBASE-14758) | Add UT case for unchecked error/exception thrown in AsyncProcess#sendMultiAction | Minor | Client, test |
| [HBASE-14728](https://issues.apache.org/jira/browse/HBASE-14728) | TestRowCounter is broken in master | Major | . |
| [HBASE-14688](https://issues.apache.org/jira/browse/HBASE-14688) | Cleanup MOB tests | Trivial | mob |
| [HBASE-14466](https://issues.apache.org/jira/browse/HBASE-14466) | Remove duplicated code from MOB snapshot tests | Trivial | mob, test |
| [HBASE-14344](https://issues.apache.org/jira/browse/HBASE-14344) | Add timeouts to TestHttpServerLifecycle | Minor | test |
| [HBASE-14310](https://issues.apache.org/jira/browse/HBASE-14310) | test-patch.sh should handle spurious non-zero exit code from maven | Minor | . |
| [HBASE-14293](https://issues.apache.org/jira/browse/HBASE-14293) | TestStochasticBalancerJmxMetrics intermittently fails due to port conflict | Minor | . |
| [HBASE-14277](https://issues.apache.org/jira/browse/HBASE-14277) | TestRegionServerHostname.testRegionServerHostname may fail at host with a case sensitive name | Minor | test |
| [HBASE-14210](https://issues.apache.org/jira/browse/HBASE-14210) | Create test for cell level ACLs involving user group | Major | test |
| [HBASE-14200](https://issues.apache.org/jira/browse/HBASE-14200) | Separate RegionReplica subtests of TestStochasticLoadBalancer into TestStochasticLoadBalancer2 | Minor | . |
| [HBASE-14197](https://issues.apache.org/jira/browse/HBASE-14197) | TestRegionServerHostname#testInvalidRegionServerHostnameAbortsServer fails in Jenkins | Minor | . |
| [HBASE-13940](https://issues.apache.org/jira/browse/HBASE-13940) | IntegrationTestBulkLoad needs option to specify output folders used by test | Major | integration tests |
| [HBASE-13609](https://issues.apache.org/jira/browse/HBASE-13609) | TestFastFail is still failing | Major | test |
| [HBASE-13591](https://issues.apache.org/jira/browse/HBASE-13591) | TestHBaseFsck is flakey | Major | hbck |
| [HBASE-13413](https://issues.apache.org/jira/browse/HBASE-13413) | Create an integration test for Replication | Minor | integration tests |
| [HBASE-13280](https://issues.apache.org/jira/browse/HBASE-13280) | TestSecureRPC failed | Minor | . |
| [HBASE-13182](https://issues.apache.org/jira/browse/HBASE-13182) | Test NamespaceAuditor/AccessController create/delete table is flaky | Minor | test |
| [HBASE-13179](https://issues.apache.org/jira/browse/HBASE-13179) | TestMasterObserver deleteTable is flaky | Minor | test |
| [HBASE-13106](https://issues.apache.org/jira/browse/HBASE-13106) | Ensure endpoint-only table coprocessors can be dynamically loaded | Trivial | . |
| [HBASE-12992](https://issues.apache.org/jira/browse/HBASE-12992) | TestChoreService doesn't close services, that can break test on slow virtual hosts. | Major | . |
| [HBASE-12764](https://issues.apache.org/jira/browse/HBASE-12764) | TestPerColumnFamilyFlush#testCompareStoreFileCount may fail due to new table not available | Minor | . |
| [HBASE-11867](https://issues.apache.org/jira/browse/HBASE-11867) | TestSplitLogManager.testUnassignedTimeout is flaky | Minor | . |
| [HBASE-11866](https://issues.apache.org/jira/browse/HBASE-11866) | TestDistributedLogSplitting is flaky | Minor | . |
| [HBASE-11673](https://issues.apache.org/jira/browse/HBASE-11673) | TestIOFencing#testFencingAroundCompactionAfterWALSync fails | Major | . |
| [HBASE-4744](https://issues.apache.org/jira/browse/HBASE-4744) | Remove @Ignore for testLogRollAfterSplitStart | Critical | . |
| [HBASE-11616](https://issues.apache.org/jira/browse/HBASE-11616) | TestNamespaceUpgrade fails in trunk | Major | . |
| [HBASE-11039](https://issues.apache.org/jira/browse/HBASE-11039) | [VisibilityController] Integration test for labeled data set mixing and filtered excise | Critical | . |
| [HBASE-11461](https://issues.apache.org/jira/browse/HBASE-11461) | Compilation errors are not posted back to JIRA during QA run | Minor | . |
### SUB-TASKS:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-20059](https://issues.apache.org/jira/browse/HBASE-20059) | Make sure documentation is updated for the offheap Bucket cache usage | Critical | documentation |
| [HBASE-20454](https://issues.apache.org/jira/browse/HBASE-20454) | [DOC] Add note on perf to upgrade section | Major | . |
| [HBASE-20347](https://issues.apache.org/jira/browse/HBASE-20347) | [DOC] upgrade section should warn about logging changes | Critical | documentation, logging |
| [HBASE-20349](https://issues.apache.org/jira/browse/HBASE-20349) | [DOC] upgrade guide should call out removal of prefix-tree data block encoding | Critical | documentation |
| [HBASE-17554](https://issues.apache.org/jira/browse/HBASE-17554) | Figure 2.0.0 Hadoop Version Support; update refguide | Blocker | documentation |
| [HBASE-20253](https://issues.apache.org/jira/browse/HBASE-20253) | Error message is missing for restore\_snapshot | Minor | shell |
| [HBASE-20380](https://issues.apache.org/jira/browse/HBASE-20380) | Put up 2.0.0RC0 | Major | . |
| [HBASE-20149](https://issues.apache.org/jira/browse/HBASE-20149) | Purge dev javadoc from bin tarball (or make a separate tarball of javadoc) | Critical | build, community, documentation |
| [HBASE-18828](https://issues.apache.org/jira/browse/HBASE-18828) | [2.0] Generate CHANGES.txt | Blocker | . |
| [HBASE-20287](https://issues.apache.org/jira/browse/HBASE-20287) | After cluster startup list\_regions command fails on disabled table | Minor | shell |
| [HBASE-20258](https://issues.apache.org/jira/browse/HBASE-20258) | Shell hangs when scanning a disabled table | Major | . |
| [HBASE-20354](https://issues.apache.org/jira/browse/HBASE-20354) | [DOC] quickstart guide needs to include note about durability checks for standalone mode | Blocker | documentation, hadoop3 |
| [HBASE-17730](https://issues.apache.org/jira/browse/HBASE-17730) | [DOC] Migration to 2.0 for coprocessors | Blocker | documentation, migration |
| [HBASE-20337](https://issues.apache.org/jira/browse/HBASE-20337) | Update the doc on how to setup shortcircuit reads; its stale | Major | . |
| [HBASE-20298](https://issues.apache.org/jira/browse/HBASE-20298) | Doc change in read/write/total accounting metrics | Critical | documentation |
| [HBASE-16848](https://issues.apache.org/jira/browse/HBASE-16848) | Usage for show\_peer\_tableCFs command doesn't include peer | Minor | . |
| [HBASE-20254](https://issues.apache.org/jira/browse/HBASE-20254) | Incorrect help message for merge\_region | Minor | shell |
| [HBASE-17819](https://issues.apache.org/jira/browse/HBASE-17819) | Reduce the heap overhead for BucketCache | Critical | BucketCache |
| [HBASE-20245](https://issues.apache.org/jira/browse/HBASE-20245) | HTrace commands do not work | Major | . |
| [HBASE-20241](https://issues.apache.org/jira/browse/HBASE-20241) | splitormerge\_enabled does not work | Critical | shell |
| [HBASE-20202](https://issues.apache.org/jira/browse/HBASE-20202) | [AMv2] Don't move region if its a split parent or offlined | Critical | amv2 |
| [HBASE-20247](https://issues.apache.org/jira/browse/HBASE-20247) | Set version as 2.0.0 in branch-2.0 in prep for first RC | Major | . |
| [HBASE-20232](https://issues.apache.org/jira/browse/HBASE-20232) | [LOGGING] Formatting around close and flush | Major | . |
| [HBASE-20190](https://issues.apache.org/jira/browse/HBASE-20190) | Fix default for MIGRATE\_TABLE\_STATE\_FROM\_ZK\_KEY | Critical | . |
| [HBASE-20180](https://issues.apache.org/jira/browse/HBASE-20180) | Avoid Class::newInstance | Major | . |
| [HBASE-20178](https://issues.apache.org/jira/browse/HBASE-20178) | [AMv2] Throw exception if hostile environment | Major | amv2 |
| [HBASE-20173](https://issues.apache.org/jira/browse/HBASE-20173) | [AMv2] DisableTableProcedure concurrent to ServerCrashProcedure can deadlock | Critical | amv2 |
| [HBASE-19093](https://issues.apache.org/jira/browse/HBASE-19093) | Check Admin/Table to ensure all operations go via AccessControl | Blocker | . |
| [HBASE-19114](https://issues.apache.org/jira/browse/HBASE-19114) | Split out o.a.h.h.zookeeper from hbase-server and hbase-client | Major | . |
| [HBASE-18758](https://issues.apache.org/jira/browse/HBASE-18758) | [TEST][compat 1-2] Test delegation tokens continue to work when hbase1 going against hbase2 cluster | Critical | API |
| [HBASE-20113](https://issues.apache.org/jira/browse/HBASE-20113) | Move branch-2 version from 2.0.0-beta-2-SNAPSHOT to 2.0.0-beta-2 | Major | . |
| [HBASE-20100](https://issues.apache.org/jira/browse/HBASE-20100) | TestEnableTableProcedure flakey | Major | amv2, flakey |
| [HBASE-19400](https://issues.apache.org/jira/browse/HBASE-19400) | Add missing security checks in MasterRpcServices | Major | . |
| [HBASE-20069](https://issues.apache.org/jira/browse/HBASE-20069) | fix existing findbugs errors in hbase-server | Critical | findbugs |
| [HBASE-20036](https://issues.apache.org/jira/browse/HBASE-20036) | TestAvoidCellReferencesIntoShippedBlocks timed out | Major | . |
| [HBASE-20083](https://issues.apache.org/jira/browse/HBASE-20083) | Fix findbugs error for ReplicationSyncUp | Major | findbugs |
| [HBASE-20019](https://issues.apache.org/jira/browse/HBASE-20019) | Document the ColumnValueFilter | Minor | documentation |
| [HBASE-20048](https://issues.apache.org/jira/browse/HBASE-20048) | Revert serial replication feature | Blocker | Replication |
| [HBASE-20044](https://issues.apache.org/jira/browse/HBASE-20044) | TestClientClusterStatus is flakey | Major | flakey |
| [HBASE-19554](https://issues.apache.org/jira/browse/HBASE-19554) | AbstractTestDLS.testThreeRSAbort sometimes fails in pre commit | Major | Recovery, wal |
| [HBASE-20038](https://issues.apache.org/jira/browse/HBASE-20038) | TestLockProcedure.testTimeout is flakey | Major | proc-v2, test |
| [HBASE-20041](https://issues.apache.org/jira/browse/HBASE-20041) | cannot start mini mapreduce cluster for ITs | Major | . |
| [HBASE-20035](https://issues.apache.org/jira/browse/HBASE-20035) | .TestQuotaStatusRPCs.testQuotaStatusFromMaster failed with NPEs and RuntimeExceptions | Major | . |
| [HBASE-20039](https://issues.apache.org/jira/browse/HBASE-20039) | move testhbasetestingutility mr tests to hbase-mapreduce | Major | . |
| [HBASE-20021](https://issues.apache.org/jira/browse/HBASE-20021) | TestFromClientSideWithCoprocessor is flakey | Major | . |
| [HBASE-20029](https://issues.apache.org/jira/browse/HBASE-20029) | @Ignore TestQuotaThrottle and TestReplicasClient#testCancelOfMultiGet | Major | . |
| [HBASE-20015](https://issues.apache.org/jira/browse/HBASE-20015) | TestMergeTableRegionsProcedure and TestRegionMergeTransactionOnCluster flakey | Major | flakey |
| [HBASE-20013](https://issues.apache.org/jira/browse/HBASE-20013) | TestZKPermissionWatcher is flakey | Major | flakey |
| [HBASE-20014](https://issues.apache.org/jira/browse/HBASE-20014) | TestAdmin1 Times out | Major | . |
| [HBASE-19978](https://issues.apache.org/jira/browse/HBASE-19978) | The keepalive logic is incomplete in ProcedureExecutor | Major | . |
| [HBASE-20011](https://issues.apache.org/jira/browse/HBASE-20011) | Disable TestRestoreSnapshotFromClientWithRegionReplicas; it is flakey. Needs attention. | Major | read replicas |
| [HBASE-19903](https://issues.apache.org/jira/browse/HBASE-19903) | Split TestShell so it will not time out | Major | shell, test |
| [HBASE-20000](https://issues.apache.org/jira/browse/HBASE-20000) | Remove the quantum logic in FairQueue, always put high priority queue in front | Major | proc-v2 |
| [HBASE-19116](https://issues.apache.org/jira/browse/HBASE-19116) | Currently the tail of hfiles with CellComparator\* classname makes it so hbase1 can't open hbase2 written hfiles; fix | Critical | HFile, migration |
| [HBASE-19965](https://issues.apache.org/jira/browse/HBASE-19965) | Fix flaky TestAsyncRegionAdminApi | Critical | . |
| [HBASE-19960](https://issues.apache.org/jira/browse/HBASE-19960) | Doc test timeouts and test categories in hbase2 | Major | . |
| [HBASE-19942](https://issues.apache.org/jira/browse/HBASE-19942) | Fix flaky TestSimpleRpcScheduler | Major | . |
| [HBASE-19956](https://issues.apache.org/jira/browse/HBASE-19956) | Remove category as a consideration timing out tests; set all test to timeout at 10minutes regardless | Major | . |
| [HBASE-19951](https://issues.apache.org/jira/browse/HBASE-19951) | Cleanup the explicit timeout value for test method | Major | . |
| [HBASE-19791](https://issues.apache.org/jira/browse/HBASE-19791) | TestZKAsyncRegistry hangs | Critical | . |
| [HBASE-19840](https://issues.apache.org/jira/browse/HBASE-19840) | Flakey TestMetaWithReplicas | Major | flakey, test |
| [HBASE-19927](https://issues.apache.org/jira/browse/HBASE-19927) | TestFullLogReconstruction flakey | Major | wal |
| [HBASE-19841](https://issues.apache.org/jira/browse/HBASE-19841) | Tests against hadoop3 fail with StreamLacksCapabilityException | Major | . |
| [HBASE-19944](https://issues.apache.org/jira/browse/HBASE-19944) | Fix timeout TestVisibilityLabelsWithCustomVisLabService | Major | . |
| [HBASE-19931](https://issues.apache.org/jira/browse/HBASE-19931) | TestMetaWithReplicas failing 100% of the time in testHBaseFsckWithMetaReplicas | Major | . |
| [HBASE-19837](https://issues.apache.org/jira/browse/HBASE-19837) | Flakey TestRegionLoad | Major | flakey, test |
| [HBASE-19803](https://issues.apache.org/jira/browse/HBASE-19803) | False positive for the HBASE-Find-Flaky-Tests job | Major | . |
| [HBASE-19910](https://issues.apache.org/jira/browse/HBASE-19910) | TestBucketCache TimesOut | Major | . |
| [HBASE-19916](https://issues.apache.org/jira/browse/HBASE-19916) | TestCacheOnWrite Times Out | Major | . |
| [HBASE-19914](https://issues.apache.org/jira/browse/HBASE-19914) | Refactor TestVisibilityLabelsOnNewVersionBehaviorTable | Major | test |
| [HBASE-19868](https://issues.apache.org/jira/browse/HBASE-19868) | TestCoprocessorWhitelistMasterObserver is flakey | Major | flakey, test |
| [HBASE-19908](https://issues.apache.org/jira/browse/HBASE-19908) | TestCoprocessorShortCircuitRPC Timeout.... | Major | . |
| [HBASE-19909](https://issues.apache.org/jira/browse/HBASE-19909) | TestRegionLocationFinder Timeout | Major | . |
| [HBASE-19928](https://issues.apache.org/jira/browse/HBASE-19928) | TestVisibilityLabelsOnNewVersionBehaviorTable fails | Major | test |
| [HBASE-19918](https://issues.apache.org/jira/browse/HBASE-19918) | Promote TestAsyncClusterAdminApi to LargeTests | Major | test |
| [HBASE-19896](https://issues.apache.org/jira/browse/HBASE-19896) | Fix ScanInfo.customize() to update only the requested options | Major | Coprocessors |
| [HBASE-19895](https://issues.apache.org/jira/browse/HBASE-19895) | Add keepDeletedCells option in ScanOptions for customizing scanInfo in pre-hooks | Major | Coprocessors |
| [HBASE-19913](https://issues.apache.org/jira/browse/HBASE-19913) | Split TestStochasticLoadBalancer2 | Major | test |
| [HBASE-19839](https://issues.apache.org/jira/browse/HBASE-19839) | Flakey TestMergeTableRegionsProcedure & TestSplitTableRegionProcedure | Major | flakey, test |
| [HBASE-19911](https://issues.apache.org/jira/browse/HBASE-19911) | Convert some tests from small to medium because they are timing out: TestNettyRpcServer, TestClientClusterStatus, TestCheckTestClasses | Major | . |
| [HBASE-19887](https://issues.apache.org/jira/browse/HBASE-19887) | Do not overwrite the surefire junit listener property in the pom of sub modules | Major | build |
| [HBASE-19891](https://issues.apache.org/jira/browse/HBASE-19891) | Up nightly test run timeout from 6 hours to 8 | Major | . |
| [HBASE-19811](https://issues.apache.org/jira/browse/HBASE-19811) | Fix findbugs and error-prone warnings in hbase-server (branch-2) | Major | . |
| [HBASE-19885](https://issues.apache.org/jira/browse/HBASE-19885) | Promote TestAssignmentManager to LargeTests | Major | . |
| [HBASE-19866](https://issues.apache.org/jira/browse/HBASE-19866) | TestRegionServerReportForDuty doesn't timeout | Major | rpc |
| [HBASE-19882](https://issues.apache.org/jira/browse/HBASE-19882) | Promote TestProcedureManager to MediumTests | Major | test |
| [HBASE-19877](https://issues.apache.org/jira/browse/HBASE-19877) | hbase-common and hbase-zookeeper don't add the log4j.properties to the resource path for testing | Critical | test |
| [HBASE-19870](https://issues.apache.org/jira/browse/HBASE-19870) | Fix the NPE in ReadOnlyZKClient#run | Major | . |
| [HBASE-19881](https://issues.apache.org/jira/browse/HBASE-19881) | Promote TestRegionReplicaReplicationEndpoint to LargeTests | Major | test |
| [HBASE-19880](https://issues.apache.org/jira/browse/HBASE-19880) | Promote TestFuzzyRowFilterEndToEnd to LargeTests | Major | test |
| [HBASE-19879](https://issues.apache.org/jira/browse/HBASE-19879) | Promote TestAcidGuaranteesXXX to LargeTests | Major | test |
| [HBASE-19867](https://issues.apache.org/jira/browse/HBASE-19867) | Split TestStochasticLoadBalancer into several small tests | Major | test |
| [HBASE-19862](https://issues.apache.org/jira/browse/HBASE-19862) | Fix TestTokenAuthentication - fake RegionCoprocessorEnvironment is not of type HasRegionServerServices | Major | . |
| [HBASE-19846](https://issues.apache.org/jira/browse/HBASE-19846) | Fix findbugs and error-prone warnings in hbase-rest (branch-2) | Major | . |
| [HBASE-19845](https://issues.apache.org/jira/browse/HBASE-19845) | Fix findbugs and error-prone warnings in hbase-rsgroup (branch-2) | Major | . |
| [HBASE-19847](https://issues.apache.org/jira/browse/HBASE-19847) | Fix findbugs and error-prone warnings in hbase-thrift (branch-2) | Major | . |
| [HBASE-19827](https://issues.apache.org/jira/browse/HBASE-19827) | Addendum for Flakey TestAssignmentManager | Major | flakey, test |
| [HBASE-18963](https://issues.apache.org/jira/browse/HBASE-18963) | Remove MultiRowMutationProcessor and implement mutateRows... methods using batchMutate() | Major | regionserver |
| [HBASE-19527](https://issues.apache.org/jira/browse/HBASE-19527) | Make ExecutorService threads daemon=true. | Major | . |
| [HBASE-19810](https://issues.apache.org/jira/browse/HBASE-19810) | Fix findbugs and error-prone warnings in hbase-metrics (branch-2) | Major | . |
| [HBASE-19809](https://issues.apache.org/jira/browse/HBASE-19809) | Fix findbugs and error-prone warnings in hbase-procedure (branch-2) | Major | . |
| [HBASE-19793](https://issues.apache.org/jira/browse/HBASE-19793) | Minor improvements on Master/RS startup | Major | . |
| [HBASE-19795](https://issues.apache.org/jira/browse/HBASE-19795) | Move the tests which only need zookeeper in TestZooKeeper to hbase-zookeeper module | Major | . |
| [HBASE-19772](https://issues.apache.org/jira/browse/HBASE-19772) | Do not close connection to zk when there are still pending request in ReadOnlyZKClient | Major | Zookeeper |
| [HBASE-19787](https://issues.apache.org/jira/browse/HBASE-19787) | Fix or disable tests broken in branch-2 so can cut beta-1 | Critical | . |
| [HBASE-19746](https://issues.apache.org/jira/browse/HBASE-19746) | Add default impl to Cell#getType | Critical | . |
| [HBASE-19743](https://issues.apache.org/jira/browse/HBASE-19743) | Disable TestMemstoreLABWithoutPool | Major | test |
| [HBASE-19731](https://issues.apache.org/jira/browse/HBASE-19731) | TestFromClientSide#testCheckAndDeleteWithCompareOp and testNullQualifier are flakey | Critical | test |
| [HBASE-19604](https://issues.apache.org/jira/browse/HBASE-19604) | Fix Checkstyle errors in hbase-protocol-shaded | Minor | . |
| [HBASE-19581](https://issues.apache.org/jira/browse/HBASE-19581) | Fix Checkstyle error in hbase-external-blockcache | Trivial | . |
| [HBASE-19667](https://issues.apache.org/jira/browse/HBASE-19667) | Get rid of MasterEnvironment#supportGroupCPs | Major | Coprocessors |
| [HBASE-19670](https://issues.apache.org/jira/browse/HBASE-19670) | Workaround: Purge User API building from branch-2 so can make a beta-1 | Major | website |
| [HBASE-19428](https://issues.apache.org/jira/browse/HBASE-19428) | Deprecate the compareTo(Row) | Major | . |
| [HBASE-19282](https://issues.apache.org/jira/browse/HBASE-19282) | CellChunkMap Benchmarking and User Interface | Major | . |
| [HBASE-19660](https://issues.apache.org/jira/browse/HBASE-19660) | Up default retries from 10 to 15 and blocking store files limit from 10 to 16 | Major | . |
| [HBASE-19133](https://issues.apache.org/jira/browse/HBASE-19133) | Transfer big cells or upserted/appended cells into MSLAB upon flattening to CellChunkMap | Major | . |
| [HBASE-19653](https://issues.apache.org/jira/browse/HBASE-19653) | Reduce the default hbase.client.start.log.errors.counter | Trivial | defaults |
| [HBASE-19626](https://issues.apache.org/jira/browse/HBASE-19626) | Rename Cell.DataType to Cell.Type | Minor | . |
| [HBASE-19648](https://issues.apache.org/jira/browse/HBASE-19648) | Move branch-2 version from 2.0.0-beta-1-SNAPSHOT to 2.0.0-beta-1 | Major | . |
| [HBASE-19609](https://issues.apache.org/jira/browse/HBASE-19609) | Fix Checkstyle errors in hbase-metrics | Minor | metrics |
| [HBASE-19628](https://issues.apache.org/jira/browse/HBASE-19628) | ByteBufferCell should extend ExtendedCell | Major | . |
| [HBASE-19629](https://issues.apache.org/jira/browse/HBASE-19629) | RawCell#getTags should return the Iterator\<Tag\> in order to avoid iterating through whole tag array at once | Major | . |
| [HBASE-19605](https://issues.apache.org/jira/browse/HBASE-19605) | Fix Checkstyle errors in hbase-metrics-api | Minor | metrics |
| [HBASE-19602](https://issues.apache.org/jira/browse/HBASE-19602) | Cleanup the usage of ReplicationAdmin from document | Minor | . |
| [HBASE-19502](https://issues.apache.org/jira/browse/HBASE-19502) | Make sure we have closed all StoreFileScanners if we fail to open any StoreFileScanners | Major | regionserver, Scanners |
| [HBASE-19591](https://issues.apache.org/jira/browse/HBASE-19591) | Cleanup the usage of ReplicationAdmin from hbase-shell | Major | . |
| [HBASE-10092](https://issues.apache.org/jira/browse/HBASE-10092) | Move to slf4j | Critical | . |
| [HBASE-19575](https://issues.apache.org/jira/browse/HBASE-19575) | add copy constructor to Mutation | Major | . |
| [HBASE-19566](https://issues.apache.org/jira/browse/HBASE-19566) | Fix Checkstyle errors in hbase-client-project | Trivial | . |
| [HBASE-19567](https://issues.apache.org/jira/browse/HBASE-19567) | ClassNotFoundException: org.apache.hadoop.hbase.KeyValue$RawBytesComparator starting 2.0.0 over a 0.98.25 data. | Major | HFile |
| [HBASE-19468](https://issues.apache.org/jira/browse/HBASE-19468) | FNFE during scans and flushes | Critical | regionserver, Scanners |
| [HBASE-19556](https://issues.apache.org/jira/browse/HBASE-19556) | Remove TestAssignmentManager#testGoodSplit, which no longer make sense | Minor | . |
| [HBASE-19494](https://issues.apache.org/jira/browse/HBASE-19494) | Create simple WALKey filter that can be plugged in on the Replication Sink | Major | Replication |
| [HBASE-19480](https://issues.apache.org/jira/browse/HBASE-19480) | Enable Checkstyle in hbase-annotations | Trivial | . |
| [HBASE-19481](https://issues.apache.org/jira/browse/HBASE-19481) | Enable Checkstyle in hbase-error-prone | Trivial | . |
| [HBASE-19538](https://issues.apache.org/jira/browse/HBASE-19538) | Remove unnecessary semicolons in hbase-client | Minor | . |
| [HBASE-19539](https://issues.apache.org/jira/browse/HBASE-19539) | Remove unnecessary semicolons in hbase-common | Minor | . |
| [HBASE-18440](https://issues.apache.org/jira/browse/HBASE-18440) | ITs and Actions modify immutable TableDescriptors | Major | integration tests |
| [HBASE-19112](https://issues.apache.org/jira/browse/HBASE-19112) | Suspect methods on Cell to be deprecated | Blocker | Client |
| [HBASE-19474](https://issues.apache.org/jira/browse/HBASE-19474) | Bring down number of Checkstyle errors in hbase-zookeeper | Minor | Zookeeper |
| [HBASE-19479](https://issues.apache.org/jira/browse/HBASE-19479) | Fix Checkstyle error in hbase-shell | Trivial | shell |
| [HBASE-19497](https://issues.apache.org/jira/browse/HBASE-19497) | Fix findbugs and error-prone warnings in hbase-common (branch-2) | Major | . |
| [HBASE-19498](https://issues.apache.org/jira/browse/HBASE-19498) | Fix findbugs and error-prone warnings in hbase-client (branch-2) | Major | . |
| [HBASE-19272](https://issues.apache.org/jira/browse/HBASE-19272) | Deal with HBCK tests disabled by HBASE-14614 AMv2 when HBCK works again... | Major | hbck |
| [HBASE-15536](https://issues.apache.org/jira/browse/HBASE-15536) | Make AsyncFSWAL as our default WAL | Critical | wal |
| [HBASE-19505](https://issues.apache.org/jira/browse/HBASE-19505) | Disable ByteBufferPool by default at HM | Major | . |
| [HBASE-19462](https://issues.apache.org/jira/browse/HBASE-19462) | Deprecate all addImmutable methods in Put | Major | . |
| [HBASE-19000](https://issues.apache.org/jira/browse/HBASE-19000) | Group multiple block cache clear requests per server | Major | . |
| [HBASE-19213](https://issues.apache.org/jira/browse/HBASE-19213) | Align check and mutate operations in Table and AsyncTable | Minor | API |
| [HBASE-19427](https://issues.apache.org/jira/browse/HBASE-19427) | Add TimeRange support into Append to optimize for counters | Major | . |
| [HBASE-16890](https://issues.apache.org/jira/browse/HBASE-16890) | Analyze the performance of AsyncWAL and fix the same | Blocker | wal |
| [HBASE-19375](https://issues.apache.org/jira/browse/HBASE-19375) | Fix import order in hbase-thrift | Trivial | Thrift |
| [HBASE-19373](https://issues.apache.org/jira/browse/HBASE-19373) | Fix Checkstyle error in hbase-annotations | Trivial | . |
| [HBASE-19360](https://issues.apache.org/jira/browse/HBASE-19360) | Remove unused imports from hbase-zookeeper module | Minor | Zookeeper |
| [HBASE-19301](https://issues.apache.org/jira/browse/HBASE-19301) | Provide way for CPs to create short circuited connection with custom configurations | Major | Coprocessors |
| [HBASE-19439](https://issues.apache.org/jira/browse/HBASE-19439) | Mark ShortCircuitMasterConnection with InterfaceAudience Private | Major | . |
| [HBASE-19430](https://issues.apache.org/jira/browse/HBASE-19430) | Remove the SettableTimestamp and SettableSequenceId | Major | . |
| [HBASE-19295](https://issues.apache.org/jira/browse/HBASE-19295) | The Configuration returned by CPEnv should be read-only. | Major | Coprocessors |
| [HBASE-18112](https://issues.apache.org/jira/browse/HBASE-18112) | Write RequestTooBigException back to client for NettyRpcServer | Major | IPC/RPC |
| [HBASE-19426](https://issues.apache.org/jira/browse/HBASE-19426) | Move has() and setTimestamp() to Mutation | Major | Client |
| [HBASE-19399](https://issues.apache.org/jira/browse/HBASE-19399) | Purge curator dependency from hbase-client | Major | Client, Zookeeper |
| [HBASE-19344](https://issues.apache.org/jira/browse/HBASE-19344) | improve asyncWAL by using Independent thread for netty #IO in FanOutOneBlockAsyncDFSOutput | Major | wal |
| [HBASE-19346](https://issues.apache.org/jira/browse/HBASE-19346) | Use EventLoopGroup to create AsyncFSOutput | Major | wal |
| [HBASE-19362](https://issues.apache.org/jira/browse/HBASE-19362) | Remove unused imports from hbase-thrift module | Minor | Thrift |
| [HBASE-19096](https://issues.apache.org/jira/browse/HBASE-19096) | Add RowMutions batch support in AsyncTable | Major | . |
| [HBASE-17049](https://issues.apache.org/jira/browse/HBASE-17049) | Do not issue sync request when there are still entries in ringbuffer | Critical | wal |
| [HBASE-19242](https://issues.apache.org/jira/browse/HBASE-19242) | Add MOB compact support for AsyncAdmin | Blocker | Admin, mob |
| [HBASE-19122](https://issues.apache.org/jira/browse/HBASE-19122) | preCompact and preFlush can bypass by returning null scanner; shut it down | Critical | Coprocessors, Scanners |
| [HBASE-19313](https://issues.apache.org/jira/browse/HBASE-19313) | Call blockUntilConnected when constructing ZKAsyncRegistry(temporary workaround) | Major | asyncclient, Client, Zookeeper |
| [HBASE-19269](https://issues.apache.org/jira/browse/HBASE-19269) | Reenable TestShellRSGroups | Major | test |
| [HBASE-19276](https://issues.apache.org/jira/browse/HBASE-19276) | RegionPlan should correctly implement equals and hashCode | Major | . |
| [HBASE-18911](https://issues.apache.org/jira/browse/HBASE-18911) | Unify Admin and AsyncAdmin's methods name | Major | . |
| [HBASE-19268](https://issues.apache.org/jira/browse/HBASE-19268) | Enable Replica tests that were disabled by Proc-V2 AM in HBASE-14614 | Major | test |
| [HBASE-19009](https://issues.apache.org/jira/browse/HBASE-19009) | implement modifyTable and enable/disableTableReplication for AsyncAdmin | Major | . |
| [HBASE-18964](https://issues.apache.org/jira/browse/HBASE-18964) | Deprecate RowProcessor and processRowsWithLocks() APIs that take RowProcessor as an argument | Major | regionserver |
| [HBASE-19270](https://issues.apache.org/jira/browse/HBASE-19270) | Reenable TestRegionMergeTransactionOnCluster#testMergeWithReplicas disable by HBASE-14614 | Major | Region Assignment |
| [HBASE-19278](https://issues.apache.org/jira/browse/HBASE-19278) | Reenable cleanup in test teardown in TestAccessController3 disabled by HBASE-14614 | Major | Region Assignment |
| [HBASE-19235](https://issues.apache.org/jira/browse/HBASE-19235) | CoprocessorEnvironment should be exposed to CPs | Minor | Coprocessors |
| [HBASE-19243](https://issues.apache.org/jira/browse/HBASE-19243) | Start mini cluster once before class for TestFIFOCompactionPolicy | Major | test |
| [HBASE-18423](https://issues.apache.org/jira/browse/HBASE-18423) | Fix TestMetaWithReplicas | Major | test |
| [HBASE-18962](https://issues.apache.org/jira/browse/HBASE-18962) | Support atomic BatchOperations through batchMutate() | Major | regionserver |
| [HBASE-19127](https://issues.apache.org/jira/browse/HBASE-19127) | Set State.SPLITTING, MERGING, MERGING\_NEW, SPLITTING\_NEW properly in RegionStatesNode | Major | . |
| [HBASE-19220](https://issues.apache.org/jira/browse/HBASE-19220) | Async tests time out talking to zk; 'clusterid came back null' | Major | test |
| [HBASE-19002](https://issues.apache.org/jira/browse/HBASE-19002) | Introduce more examples to show how to intercept normal region operations | Minor | Coprocessors |
| [HBASE-18624](https://issues.apache.org/jira/browse/HBASE-18624) | Added support for clearing BlockCache based on table name | Major | . |
| [HBASE-19203](https://issues.apache.org/jira/browse/HBASE-19203) | Update Hadoop version used for build to 2.7.4 | Major | . |
| [HBASE-18961](https://issues.apache.org/jira/browse/HBASE-18961) | doMiniBatchMutate() is big, split it into smaller methods | Major | regionserver |
| [HBASE-19197](https://issues.apache.org/jira/browse/HBASE-19197) | Move version on branch-2 from 2.0.0-alpha4 to 2.0.0-beta-1.SNAPSHOT | Major | . |
| [HBASE-18950](https://issues.apache.org/jira/browse/HBASE-18950) | Remove Optional parameters in AsyncAdmin interface | Blocker | Client |
| [HBASE-19131](https://issues.apache.org/jira/browse/HBASE-19131) | Add the ClusterStatus hook and cleanup other hooks which can be replaced by ClusterStatus hook | Major | Coprocessors |
| [HBASE-19095](https://issues.apache.org/jira/browse/HBASE-19095) | Add CP hooks in RegionObserver for in memory compaction | Major | Coprocessors |
| [HBASE-19152](https://issues.apache.org/jira/browse/HBASE-19152) | Update refguide 'how to build an RC' and the make\_rc.sh script | Trivial | build |
| [HBASE-18972](https://issues.apache.org/jira/browse/HBASE-18972) | Use Builder pattern to remove nullable parameters for coprocessor methods in RawAsyncTable interface | Blocker | Client |
| [HBASE-19141](https://issues.apache.org/jira/browse/HBASE-19141) | [compat 1-2] getClusterStatus always return empty ClusterStatus | Critical | API |
| [HBASE-18770](https://issues.apache.org/jira/browse/HBASE-18770) | Remove bypass method in ObserverContext and implement the 'bypass' logic case by case | Critical | Coprocessors |
| [HBASE-18375](https://issues.apache.org/jira/browse/HBASE-18375) | The pool chunks from ChunkCreator are deallocated while in pool because there is no reference to them | Critical | . |
| [HBASE-19136](https://issues.apache.org/jira/browse/HBASE-19136) | Set branch-2 version to 2.0.0-alpha4 from 2.0.0-alpha4-SNAPSHOT | Major | . |
| [HBASE-19031](https://issues.apache.org/jira/browse/HBASE-19031) | Align exist method in Table and AsyncTable interfaces | Critical | asyncclient, Client |
| [HBASE-18995](https://issues.apache.org/jira/browse/HBASE-18995) | Move methods that are for internal usage from CellUtil to Private util class | Critical | . |
| [HBASE-18906](https://issues.apache.org/jira/browse/HBASE-18906) | Provide Region#waitForFlushes API | Critical | Coprocessors |
| [HBASE-19090](https://issues.apache.org/jira/browse/HBASE-19090) | Add config 'hbase.systemtables.compacting.memstore.type' to hbase-default.xml | Major | . |
| [HBASE-19048](https://issues.apache.org/jira/browse/HBASE-19048) | Cleanup MasterObserver hooks which takes IA private params | Major | Coprocessors |
| [HBASE-19029](https://issues.apache.org/jira/browse/HBASE-19029) | Align RPC timout methods in Table and AsyncTableBase | Critical | asyncclient, Client |
| [HBASE-19057](https://issues.apache.org/jira/browse/HBASE-19057) | Fix other code review comments about FilterList Improvement | Blocker | Filters |
| [HBASE-19074](https://issues.apache.org/jira/browse/HBASE-19074) | Miscellaneous Observer cleanups | Major | Coprocessors |
| [HBASE-19070](https://issues.apache.org/jira/browse/HBASE-19070) | temporarily make the mvnsite nightly test non-voting. | Major | build |
| [HBASE-18754](https://issues.apache.org/jira/browse/HBASE-18754) | Get rid of Writable from TimeRangeTracker | Major | . |
| [HBASE-19053](https://issues.apache.org/jira/browse/HBASE-19053) | Split out o.a.h.h.http from hbase-server into a separate module | Major | . |
| [HBASE-19069](https://issues.apache.org/jira/browse/HBASE-19069) | Do not wrap the original CompactionLifeCycleTracker when calling CP hooks | Blocker | Compaction, Coprocessors |
| [HBASE-18873](https://issues.apache.org/jira/browse/HBASE-18873) | Hide protobufs in GlobalQuotaSettings | Critical | . |
| [HBASE-19010](https://issues.apache.org/jira/browse/HBASE-19010) | Reimplement getMasterInfoPort for Admin | Major | Client |
| [HBASE-19045](https://issues.apache.org/jira/browse/HBASE-19045) | Deprecate RegionObserver#postInstantiateDeleteTracker | Major | Coprocessors |
| [HBASE-18977](https://issues.apache.org/jira/browse/HBASE-18977) | Reenable test of filterlist using MUST\_PASS\_ONE and two familyfilters | Blocker | Filters |
| [HBASE-18945](https://issues.apache.org/jira/browse/HBASE-18945) | Make a IA.LimitedPrivate interface for CellComparator | Major | . |
| [HBASE-18960](https://issues.apache.org/jira/browse/HBASE-18960) | A few bug fixes and minor improvements around batchMutate() | Major | regionserver |
| [HBASE-18914](https://issues.apache.org/jira/browse/HBASE-18914) | Remove AsyncAdmin's methods which were already deprecated in Admin interface | Major | . |
| [HBASE-18954](https://issues.apache.org/jira/browse/HBASE-18954) | Make \*CoprocessorHost classes private | Major | Coprocessors |
| [HBASE-18966](https://issues.apache.org/jira/browse/HBASE-18966) | Use non-sync TimeRangeTracker as a replacement for TimeRange in ImmutableSegment | Major | . |
| [HBASE-18747](https://issues.apache.org/jira/browse/HBASE-18747) | Introduce new example and helper classes to tell CP users how to do filtering on scanners | Critical | Coprocessors |
| [HBASE-18411](https://issues.apache.org/jira/browse/HBASE-18411) | Dividing FiterList into two separate sub-classes: FilterListWithOR , FilterListWithAND | Major | Filters |
| [HBASE-18108](https://issues.apache.org/jira/browse/HBASE-18108) | Procedure WALs are archived but not cleaned; fix | Blocker | proc-v2 |
| [HBASE-18867](https://issues.apache.org/jira/browse/HBASE-18867) | maven enforcer plugin needs update to work with jdk9 | Blocker | build |
| [HBASE-18981](https://issues.apache.org/jira/browse/HBASE-18981) | Address issues found by error-prone in hbase-client | Trivial | . |
| [HBASE-18980](https://issues.apache.org/jira/browse/HBASE-18980) | Address issues found by error-prone in hbase-hadoop2-compat | Trivial | . |
| [HBASE-18951](https://issues.apache.org/jira/browse/HBASE-18951) | Use Builder pattern to remove nullable parameters for checkAndXXX methods in RawAsyncTable/AsyncTable interface | Blocker | asyncclient, Client |
| [HBASE-18160](https://issues.apache.org/jira/browse/HBASE-18160) | Fix incorrect logic in FilterList.filterKeyValue | Major | Filters |
| [HBASE-17678](https://issues.apache.org/jira/browse/HBASE-17678) | FilterList with MUST\_PASS\_ONE may lead to redundant cells returned | Major | Filters |
| [HBASE-18957](https://issues.apache.org/jira/browse/HBASE-18957) | add test that confirms 2 FamilyFilters in a FilterList using MUST\_PASS\_ONE operator will return results that match either of the FamilyFilters and revert as needed to make it pass. | Critical | Filters |
| [HBASE-18949](https://issues.apache.org/jira/browse/HBASE-18949) | Remove the CompactionRequest parameter in preCompactSelection | Major | Coprocessors |
| [HBASE-18752](https://issues.apache.org/jira/browse/HBASE-18752) | Recalculate the TimeRange in flushing snapshot to store file | Major | . |
| [HBASE-18909](https://issues.apache.org/jira/browse/HBASE-18909) | Deprecate Admin's methods which used String regex | Major | Admin |
| [HBASE-18931](https://issues.apache.org/jira/browse/HBASE-18931) | Make ObserverContext an interface and remove private/testing methods | Major | Coprocessors |
| [HBASE-18933](https://issues.apache.org/jira/browse/HBASE-18933) | set version number to 2.0.0-alpha4-SNAPSHOT following release of alpha3 | Blocker | build |
| [HBASE-18815](https://issues.apache.org/jira/browse/HBASE-18815) | We need to pass something like CompactionRequest in CP to give user some information about the compaction | Major | Coprocessors |
| [HBASE-18105](https://issues.apache.org/jira/browse/HBASE-18105) | [AMv2] Split/Merge need cleanup; currently they diverge and do not fully embrace AMv2 world | Major | Region Assignment |
| [HBASE-18753](https://issues.apache.org/jira/browse/HBASE-18753) | Introduce the unsynchronized TimeRangeTracker | Major | . |
| [HBASE-18010](https://issues.apache.org/jira/browse/HBASE-18010) | Connect CellChunkMap to be used for flattening in CompactingMemStore | Major | . |
| [HBASE-18807](https://issues.apache.org/jira/browse/HBASE-18807) | Remove PB references from Observers for Quotas | Major | . |
| [HBASE-18786](https://issues.apache.org/jira/browse/HBASE-18786) | FileNotFoundException should not be silently handled for primary region replicas | Major | regionserver, Scanners |
| [HBASE-18823](https://issues.apache.org/jira/browse/HBASE-18823) | Apply RegionInfo to MasterObserver/RegionObserver/WALObserver | Major | Coprocessors |
| [HBASE-17980](https://issues.apache.org/jira/browse/HBASE-17980) | Any HRegionInfo we give out should be immutable | Major | . |
| [HBASE-18821](https://issues.apache.org/jira/browse/HBASE-18821) | Enforcer plugin NPEs again when generating site | Major | website |
| [HBASE-18820](https://issues.apache.org/jira/browse/HBASE-18820) | assembly is missing hbase-replication | Major | build |
| [HBASE-18819](https://issues.apache.org/jira/browse/HBASE-18819) | Set version number to 2.0.0-alpha3 from 2.0.0-alpha3-SNAPSHOT | Major | . |
| [HBASE-14998](https://issues.apache.org/jira/browse/HBASE-14998) | Unify synchronous and asynchronous methods in Admin and cleanup | Blocker | . |
| [HBASE-18718](https://issues.apache.org/jira/browse/HBASE-18718) | Document the coprocessor.Export | Major | Coprocessors, documentation, tooling |
| [HBASE-18750](https://issues.apache.org/jira/browse/HBASE-18750) | Cleanup the docs saying "HTable use write buffer" | Minor | documentation |
| [HBASE-18779](https://issues.apache.org/jira/browse/HBASE-18779) | Move CompareOperator to hbase-client module | Critical | . |
| [HBASE-18769](https://issues.apache.org/jira/browse/HBASE-18769) | Make CompareFilter use generic CompareOperator instead of internal enum | Major | . |
| [HBASE-14997](https://issues.apache.org/jira/browse/HBASE-14997) | Move compareOp and Comparators out of filter to client package | Critical | . |
| [HBASE-18697](https://issues.apache.org/jira/browse/HBASE-18697) | Need a shaded hbase-mapreduce module | Major | mapreduce |
| [HBASE-18749](https://issues.apache.org/jira/browse/HBASE-18749) | Apply the CF specific TimeRange from Scan to filter the segment scanner | Minor | . |
| [HBASE-18739](https://issues.apache.org/jira/browse/HBASE-18739) | Make all TimeRange Constructors InterfaceAudience Private. | Major | API |
| [HBASE-18721](https://issues.apache.org/jira/browse/HBASE-18721) | Cleanup unused configs and private declaration | Minor | . |
| [HBASE-18700](https://issues.apache.org/jira/browse/HBASE-18700) | Document the new changes on mapreduce stuffs | Major | mapreduce |
| [HBASE-18698](https://issues.apache.org/jira/browse/HBASE-18698) | MapreduceDependencyClasspathTool does not include hbase-server as a dependency | Major | mapreduce |
| [HBASE-18692](https://issues.apache.org/jira/browse/HBASE-18692) | [compat 1-2] ByteBufferUtils.copyFromBufferToBuffer goes from void to int | Major | API |
| [HBASE-18691](https://issues.apache.org/jira/browse/HBASE-18691) | [compat 1-2] HCD remove and removeConfiguration change return type | Major | API |
| [HBASE-18688](https://issues.apache.org/jira/browse/HBASE-18688) | Upgrade commons-codec to 1.10 | Major | dependencies |
| [HBASE-16324](https://issues.apache.org/jira/browse/HBASE-16324) | Remove LegacyScanQueryMatcher | Critical | Compaction, regionserver |
| [HBASE-18687](https://issues.apache.org/jira/browse/HBASE-18687) | Add @since 2.0.0 to new classes | Major | API |
| [HBASE-18448](https://issues.apache.org/jira/browse/HBASE-18448) | EndPoint example for refreshing HFiles for stores | Minor | Coprocessors |
| [HBASE-18656](https://issues.apache.org/jira/browse/HBASE-18656) | Address issues found by error-prone in hbase-common | Major | build |
| [HBASE-18658](https://issues.apache.org/jira/browse/HBASE-18658) | Purge hokey hbase Service implementation; use (internal) Guava Service instead | Major | . |
| [HBASE-18347](https://issues.apache.org/jira/browse/HBASE-18347) | Implement a BufferedMutator for async client | Major | asyncclient, Client |
| [HBASE-18503](https://issues.apache.org/jira/browse/HBASE-18503) | Change \*\*\*Util and Master to use TableDescriptor and ColumnFamilyDescriptor | Major | . |
| [HBASE-18103](https://issues.apache.org/jira/browse/HBASE-18103) | [AMv2] If Master gives OPEN to another, if original eventually succeeds, Master will kill it | Critical | master, proc-v2 |
| [HBASE-18489](https://issues.apache.org/jira/browse/HBASE-18489) | Expose scan cursor in RawScanResultConsumer | Major | asyncclient, Client, scan |
| [HBASE-18608](https://issues.apache.org/jira/browse/HBASE-18608) | AsyncConnection should return AsyncAdmin interface instead of the implemenation | Major | Client |
| [HBASE-18595](https://issues.apache.org/jira/browse/HBASE-18595) | Set version in branch-2 from 2.0.0-alpha2-SNAPSHOT to 2.0.0-alpha2 | Major | . |
| [HBASE-18553](https://issues.apache.org/jira/browse/HBASE-18553) | Expose scan cursor for asynchronous scanner | Major | . |
| [HBASE-17994](https://issues.apache.org/jira/browse/HBASE-17994) | Add async client test to Performance Evaluation tool | Major | . |
| [HBASE-18424](https://issues.apache.org/jira/browse/HBASE-18424) | Fix TestAsyncTableGetMultiThreaded | Major | test |
| [HBASE-18238](https://issues.apache.org/jira/browse/HBASE-18238) | Address ruby static analysis for bin directory | Major | . |
| [HBASE-18593](https://issues.apache.org/jira/browse/HBASE-18593) | Tell m2eclipse what to do w/ replacer plugin | Trivial | build |
| [HBASE-18271](https://issues.apache.org/jira/browse/HBASE-18271) | Shade netty | Blocker | rpc |
| [HBASE-18398](https://issues.apache.org/jira/browse/HBASE-18398) | Snapshot operation fails with FileNotFoundException | Major | snapshots |
| [HBASE-18315](https://issues.apache.org/jira/browse/HBASE-18315) | Eliminate the findbugs warnings for hbase-rest | Major | . |
| [HBASE-18102](https://issues.apache.org/jira/browse/HBASE-18102) | [SHELL] Purge close\_region command that allows by-pass of Master | Major | Operability, shell |
| [HBASE-18231](https://issues.apache.org/jira/browse/HBASE-18231) | Deprecate and throw unsupported operation when Admin#closeRegion is called. | Critical | Admin |
| [HBASE-18367](https://issues.apache.org/jira/browse/HBASE-18367) | Reduce ProcedureInfo usage | Major | master, proc-v2 |
| [HBASE-18107](https://issues.apache.org/jira/browse/HBASE-18107) | [AMv2] Remove DispatchMergingRegionsRequest & DispatchMergingRegions | Major | Region Assignment |
| [HBASE-18428](https://issues.apache.org/jira/browse/HBASE-18428) | IntegrationTestDDLMasterFailover uses old-style immutable column descriptors | Major | integration tests |
| [HBASE-18419](https://issues.apache.org/jira/browse/HBASE-18419) | Update IntegrationTestIngestWithMOB and Actions to use ColumnFamily builders for modification | Critical | integration tests |
| [HBASE-18420](https://issues.apache.org/jira/browse/HBASE-18420) | Some methods of Admin don't use ColumnFamilyDescriptor | Major | . |
| [HBASE-17738](https://issues.apache.org/jira/browse/HBASE-17738) | BucketCache startup is slow | Major | BucketCache |
| [HBASE-18308](https://issues.apache.org/jira/browse/HBASE-18308) | Eliminate the findbugs warnings for hbase-server | Major | . |
| [HBASE-18052](https://issues.apache.org/jira/browse/HBASE-18052) | Add document for async admin | Major | Client |
| [HBASE-18229](https://issues.apache.org/jira/browse/HBASE-18229) | create new Async Split API to embrace AM v2 | Critical | proc-v2 |
| [HBASE-18342](https://issues.apache.org/jira/browse/HBASE-18342) | Add coprocessor service support for async admin | Major | Client |
| [HBASE-17922](https://issues.apache.org/jira/browse/HBASE-17922) | TestRegionServerHostname always fails against hadoop 3.0.0-alpha2 | Major | hadoop3 |
| [HBASE-18365](https://issues.apache.org/jira/browse/HBASE-18365) | Eliminate the findbugs warnings for hbase-common | Major | . |
| [HBASE-18343](https://issues.apache.org/jira/browse/HBASE-18343) | Track the remaining unimplemented methods for async admin | Major | Client |
| [HBASE-18268](https://issues.apache.org/jira/browse/HBASE-18268) | Eliminate the findbugs warnings for hbase-client | Major | Client |
| [HBASE-18295](https://issues.apache.org/jira/browse/HBASE-18295) | The result contains the cells across different rows | Blocker | Scanners |
| [HBASE-18318](https://issues.apache.org/jira/browse/HBASE-18318) | Implement updateConfiguration/stopMaster/stopRegionServer/shutdown methods | Major | Client |
| [HBASE-18316](https://issues.apache.org/jira/browse/HBASE-18316) | Implement async admin operations for draining region servers | Major | Client |
| [HBASE-18317](https://issues.apache.org/jira/browse/HBASE-18317) | Implement async admin operations for Normalizer/CleanerChore/CatalogJanitor | Major | Client |
| [HBASE-18319](https://issues.apache.org/jira/browse/HBASE-18319) | Implement getClusterStatus/getRegionLoad/getCompactionState/getLastMajorCompactionTimestamp methods | Major | Client |
| [HBASE-18002](https://issues.apache.org/jira/browse/HBASE-18002) | Investigate why bucket cache filling up in file mode in an exisiting file is slower | Major | BucketCache |
| [HBASE-17201](https://issues.apache.org/jira/browse/HBASE-17201) | Edit of HFileBlock comments and javadoc | Major | documentation |
| [HBASE-18240](https://issues.apache.org/jira/browse/HBASE-18240) | Add hbase-thirdparty, a project with hbase utility including an hbase-shaded-thirdparty module with guava, netty, etc. | Major | dependencies, shading |
| [HBASE-18297](https://issues.apache.org/jira/browse/HBASE-18297) | Provide a AsyncAdminBuilder to create new AsyncAdmin instance | Major | Client |
| [HBASE-18314](https://issues.apache.org/jira/browse/HBASE-18314) | Eliminate the findbugs warnings for hbase-examples | Major | . |
| [HBASE-18264](https://issues.apache.org/jira/browse/HBASE-18264) | Update pom plugins | Major | . |
| [HBASE-18283](https://issues.apache.org/jira/browse/HBASE-18283) | Provide a construct method which accept a thread pool for AsyncAdmin | Major | Client |
| [HBASE-18293](https://issues.apache.org/jira/browse/HBASE-18293) | Only add the spotbugs dependency when jdk8 is active | Major | build |
| [HBASE-18239](https://issues.apache.org/jira/browse/HBASE-18239) | Address ruby static analysis for shell module | Major | . |
| [HBASE-14902](https://issues.apache.org/jira/browse/HBASE-14902) | Revert some of the stringency recently introduced by checkstyle tightening | Major | . |
| [HBASE-18272](https://issues.apache.org/jira/browse/HBASE-18272) | Fix issue about RSGroupBasedLoadBalancer#roundRobinAssignment where BOGUS\_SERVER\_NAME is involved in two groups | Major | Balancer |
| [HBASE-18234](https://issues.apache.org/jira/browse/HBASE-18234) | Revisit the async admin api | Major | Client |
| [HBASE-18221](https://issues.apache.org/jira/browse/HBASE-18221) | Switch from pread to stream should happen under HStore's reentrant lock | Major | Scanners |
| [HBASE-16242](https://issues.apache.org/jira/browse/HBASE-16242) | Upgrade Avro to 1.7.7 | Major | dependencies |
| [HBASE-18104](https://issues.apache.org/jira/browse/HBASE-18104) | [AMv2] Enable aggregation of RPCs (assigns/unassigns, etc.) | Major | Region Assignment |
| [HBASE-18213](https://issues.apache.org/jira/browse/HBASE-18213) | Add documentation about the new async client | Major | asyncclient, Client, documentation |
| [HBASE-18220](https://issues.apache.org/jira/browse/HBASE-18220) | Compaction scanners need not reopen storefile scanners while trying to switch over from pread to stream | Major | Compaction |
| [HBASE-17008](https://issues.apache.org/jira/browse/HBASE-17008) | Examples to make AsyncClient go down easy | Critical | asyncclient, Client |
| [HBASE-18109](https://issues.apache.org/jira/browse/HBASE-18109) | Assign system tables first (priority) | Critical | Region Assignment |
| [HBASE-18008](https://issues.apache.org/jira/browse/HBASE-18008) | Any HColumnDescriptor we give out should be immutable | Major | . |
| [HBASE-18190](https://issues.apache.org/jira/browse/HBASE-18190) | Set version in branch-2 to 2.0.0-alpha-1 | Major | . |
| [HBASE-18191](https://issues.apache.org/jira/browse/HBASE-18191) | Include hbase-metrics-\* in assembly | Major | . |
| [HBASE-16392](https://issues.apache.org/jira/browse/HBASE-16392) | Backup delete fault tolerance | Major | . |
| [HBASE-15160](https://issues.apache.org/jira/browse/HBASE-15160) | Put back HFile's HDFS op latency sampling code and add metrics for monitoring | Critical | . |
| [HBASE-16549](https://issues.apache.org/jira/browse/HBASE-16549) | Procedure v2 - Add new AM metrics | Major | proc-v2, Region Assignment |
| [HBASE-15995](https://issues.apache.org/jira/browse/HBASE-15995) | Separate replication WAL reading from shipping | Major | Replication |
| [HBASE-17530](https://issues.apache.org/jira/browse/HBASE-17530) | Readd TestMergeTableRegionsProcedure mistakenly removed by HBASE-16786 | Critical | test |
| [HBASE-16543](https://issues.apache.org/jira/browse/HBASE-16543) | Separate Create/Modify Table operations from open/reopen regions | Major | master |
| [HBASE-16261](https://issues.apache.org/jira/browse/HBASE-16261) | MultiHFileOutputFormat Enhancement | Major | hbase, mapreduce |
| [HBASE-18115](https://issues.apache.org/jira/browse/HBASE-18115) | Move SaslServer creation to HBaseSaslRpcServer | Major | IPC/RPC |
| [HBASE-18114](https://issues.apache.org/jira/browse/HBASE-18114) | Update the config of TestAsync\*AdminApi to make test stable | Major | Client |
| [HBASE-17066](https://issues.apache.org/jira/browse/HBASE-17066) | Procedure v2 - Add handling of merge region transition to the new AM | Major | proc-v2, Region Assignment |
| [HBASE-18091](https://issues.apache.org/jira/browse/HBASE-18091) | Add API for who currently holds a lock on namespace/ table/ region and log when state is LOCK\_EVENT\_WAIT | Major | proc-v2 |
| [HBASE-18013](https://issues.apache.org/jira/browse/HBASE-18013) | Write response directly instead of creating a fake call when setup connection | Major | IPC/RPC |
| [HBASE-17850](https://issues.apache.org/jira/browse/HBASE-17850) | Backup system repair utility | Major | . |
| [HBASE-18068](https://issues.apache.org/jira/browse/HBASE-18068) | Fix flaky test TestAsyncSnapshotAdminApi | Major | Client |
| [HBASE-18016](https://issues.apache.org/jira/browse/HBASE-18016) | Implement abort for TruncateTableProcedure | Major | proc-v2 |
| [HBASE-18018](https://issues.apache.org/jira/browse/HBASE-18018) | Support abort for all procedures by default | Major | proc-v2 |
| [HBASE-16851](https://issues.apache.org/jira/browse/HBASE-16851) | User-facing documentation for the In-Memory Compaction feature | Major | . |
| [HBASE-16436](https://issues.apache.org/jira/browse/HBASE-16436) | Add the CellChunkMap variant | Major | regionserver |
| [HBASE-18012](https://issues.apache.org/jira/browse/HBASE-18012) | Move RpcServer.Connection to a separated file | Major | IPC/RPC |
| [HBASE-17938](https://issues.apache.org/jira/browse/HBASE-17938) | General fault - tolerance framework for backup/restore operations | Major | . |
| [HBASE-17786](https://issues.apache.org/jira/browse/HBASE-17786) | Create LoadBalancer perf-tests (test balancer algorithm decoupled from workload) | Major | Balancer, proc-v2 |
| [HBASE-17887](https://issues.apache.org/jira/browse/HBASE-17887) | Row-level consistency is broken for read | Blocker | regionserver |
| [HBASE-17917](https://issues.apache.org/jira/browse/HBASE-17917) | Use pread by default for all user scan and switch to streaming read if needed | Major | scan |
| [HBASE-17977](https://issues.apache.org/jira/browse/HBASE-17977) | Enabled Master observer to delete quotas on table deletion by default | Major | . |
| [HBASE-17667](https://issues.apache.org/jira/browse/HBASE-17667) | Implement async flush/compact region methods | Major | Admin, asyncclient, Client |
| [HBASE-17978](https://issues.apache.org/jira/browse/HBASE-17978) | Investigate hbase superuser permissions in the face of quota violation | Major | . |
| [HBASE-17981](https://issues.apache.org/jira/browse/HBASE-17981) | Roll list\_quota\_violations into list\_quota\_snapshots | Major | . |
| [HBASE-17867](https://issues.apache.org/jira/browse/HBASE-17867) | Implement async procedure RPC API(list/exec/abort/isFinished) | Major | Client |
| [HBASE-17263](https://issues.apache.org/jira/browse/HBASE-17263) | Netty based rpc server impl | Major | Performance, rpc |
| [HBASE-17976](https://issues.apache.org/jira/browse/HBASE-17976) | Remove stability annotation from public audience-marked classes | Major | . |
| [HBASE-17955](https://issues.apache.org/jira/browse/HBASE-17955) | Commit Reviewboard comments from Vlad | Major | . |
| [HBASE-17920](https://issues.apache.org/jira/browse/HBASE-17920) | TestFSHDFSUtils always fails against hadoop 3.0.0-alpha2 | Major | hadoop3 |
| [HBASE-17865](https://issues.apache.org/jira/browse/HBASE-17865) | Implement async listSnapshot/deleteSnapshot methods. | Major | Client |
| [HBASE-16942](https://issues.apache.org/jira/browse/HBASE-16942) | Add FavoredStochasticLoadBalancer and FN Candidate generators | Major | FavoredNodes |
| [HBASE-17873](https://issues.apache.org/jira/browse/HBASE-17873) | Change the IA.Public annotation to IA.Private for unstable API | Blocker | API |
| [HBASE-15583](https://issues.apache.org/jira/browse/HBASE-15583) | Any HTableDescriptor we give out should be immutable | Minor | . |
| [HBASE-15143](https://issues.apache.org/jira/browse/HBASE-15143) | Procedure v2 - Web UI displaying queues | Minor | proc-v2, UI |
| [HBASE-17952](https://issues.apache.org/jira/browse/HBASE-17952) | The new options for PE tool do not work | Major | Performance, test |
| [HBASE-16314](https://issues.apache.org/jira/browse/HBASE-16314) | Retry on table snapshot failure during full backup | Major | . |
| [HBASE-17864](https://issues.apache.org/jira/browse/HBASE-17864) | Implement async snapshot/cloneSnapshot/restoreSnapshot methods | Major | Client |
| [HBASE-17915](https://issues.apache.org/jira/browse/HBASE-17915) | Implement async replication admin methods | Major | Client |
| [HBASE-17929](https://issues.apache.org/jira/browse/HBASE-17929) | Add more options for PE tool | Major | Performance, test |
| [HBASE-16438](https://issues.apache.org/jira/browse/HBASE-16438) | Create a cell type so that chunk id is embedded in it | Major | regionserver |
| [HBASE-17925](https://issues.apache.org/jira/browse/HBASE-17925) | mvn assembly:single fails against hadoop3-alpha2 | Major | hadoop3 |
| [HBASE-17866](https://issues.apache.org/jira/browse/HBASE-17866) | Implement async setQuota/getQuota methods. | Major | Client |
| [HBASE-17897](https://issues.apache.org/jira/browse/HBASE-17897) | StripeStoreFileManager#nonOpenRowCompare use the wrong comparison function | Major | . |
| [HBASE-17895](https://issues.apache.org/jira/browse/HBASE-17895) | TestAsyncProcess#testAction fails if unsafe support is false | Trivial | test |
| [HBASE-17896](https://issues.apache.org/jira/browse/HBASE-17896) | The FIXED\_OVERHEAD of Segment is incorrect | Minor | . |
| [HBASE-16477](https://issues.apache.org/jira/browse/HBASE-16477) | Remove Writable interface and related code from WALEdit/WALKey | Major | wal |
| [HBASE-17872](https://issues.apache.org/jira/browse/HBASE-17872) | The MSLABImpl generates the invaild cells when unsafe is not availble | Critical | . |
| [HBASE-17881](https://issues.apache.org/jira/browse/HBASE-17881) | Remove the ByteBufferCellImpl | Minor | test |
| [HBASE-17858](https://issues.apache.org/jira/browse/HBASE-17858) | Update refguide about the IS annotation if necessary | Major | API, documentation |
| [HBASE-16217](https://issues.apache.org/jira/browse/HBASE-16217) | Identify calling user in ObserverContext | Major | Coprocessors, security |
| [HBASE-17857](https://issues.apache.org/jira/browse/HBASE-17857) | Remove IS annotations from IA.Public classes | Major | API |
| [HBASE-17859](https://issues.apache.org/jira/browse/HBASE-17859) | ByteBufferUtils#compareTo is wrong | Critical | . |
| [HBASE-17668](https://issues.apache.org/jira/browse/HBASE-17668) | Implement async assgin/offline/move/unassign methods | Major | Admin, asyncclient, Client |
| [HBASE-17855](https://issues.apache.org/jira/browse/HBASE-17855) | Fix typo in async client implementation | Major | asyncclient, Client |
| [HBASE-17844](https://issues.apache.org/jira/browse/HBASE-17844) | Subset of HBASE-14614, Procedure v2: Core Assignment Manager (non-critical related changes) | Major | Region Assignment |
| [HBASE-17520](https://issues.apache.org/jira/browse/HBASE-17520) | Implement isTableEnabled/Disabled/Available methods | Major | Client |
| [HBASE-17765](https://issues.apache.org/jira/browse/HBASE-17765) | Reviving the merge possibility in the CompactingMemStore | Major | . |
| [HBASE-13395](https://issues.apache.org/jira/browse/HBASE-13395) | Remove HTableInterface | Major | API |
| [HBASE-17669](https://issues.apache.org/jira/browse/HBASE-17669) | Implement async mergeRegion/splitRegion methods. | Major | Admin, asyncclient, Client |
| [HBASE-17809](https://issues.apache.org/jira/browse/HBASE-17809) | cleanup unused class | Major | . |
| [HBASE-17805](https://issues.apache.org/jira/browse/HBASE-17805) | We should remove BoundedByteBufferPool because it is replaced by ByteBufferPool | Minor | . |
| [HBASE-17447](https://issues.apache.org/jira/browse/HBASE-17447) | Automatically delete quota when table is deleted | Major | . |
| [HBASE-17003](https://issues.apache.org/jira/browse/HBASE-17003) | Update book for filesystem use quotas | Major | documentation |
| [HBASE-17794](https://issues.apache.org/jira/browse/HBASE-17794) | Remove lingering "violation" in favor of the accurate "snapshot" | Trivial | . |
| [HBASE-17691](https://issues.apache.org/jira/browse/HBASE-17691) | Add ScanMetrics support for async scan | Major | Client |
| [HBASE-15314](https://issues.apache.org/jira/browse/HBASE-15314) | Allow more than one backing file in bucketcache | Major | BucketCache |
| [HBASE-17790](https://issues.apache.org/jira/browse/HBASE-17790) | Mark ReplicationAdmin's peerAdded and listReplicationPeers as Deprecated | Minor | Replication |
| [HBASE-17740](https://issues.apache.org/jira/browse/HBASE-17740) | Correct the semantic of batch and partial for async client | Critical | asyncclient, Client, scan |
| [HBASE-17338](https://issues.apache.org/jira/browse/HBASE-17338) | Treat Cell data size under global memstore heap size only when that Cell can not be copied to MSLAB | Major | regionserver |
| [HBASE-17745](https://issues.apache.org/jira/browse/HBASE-17745) | Support short circuit connection for master services | Major | . |
| [HBASE-17600](https://issues.apache.org/jira/browse/HBASE-17600) | Implement get/create/modify/delete/list namespace admin operations | Major | Client |
| [HBASE-17002](https://issues.apache.org/jira/browse/HBASE-17002) | [Master] Report quotas and active violations on Master UI and JMX metrics | Major | master, UI |
| [HBASE-17568](https://issues.apache.org/jira/browse/HBASE-17568) | Expire region reports in the HMaster | Major | . |
| [HBASE-15484](https://issues.apache.org/jira/browse/HBASE-15484) | Correct the semantic of batch and partial | Blocker | Client, scan |
| [HBASE-17602](https://issues.apache.org/jira/browse/HBASE-17602) | Tweak chore delay/period defaults | Trivial | . |
| [HBASE-17516](https://issues.apache.org/jira/browse/HBASE-17516) | Table quota not taking precedence over namespace quota | Major | . |
| [HBASE-17646](https://issues.apache.org/jira/browse/HBASE-17646) | Implement Async getRegion method | Major | asyncclient |
| [HBASE-17662](https://issues.apache.org/jira/browse/HBASE-17662) | Disable in-memory flush when replaying from WAL | Major | . |
| [HBASE-17428](https://issues.apache.org/jira/browse/HBASE-17428) | Expand on shell commands for detailed insight | Major | shell |
| [HBASE-16991](https://issues.apache.org/jira/browse/HBASE-16991) | Make the initialization of AsyncConnection asynchronous | Minor | Client |
| [HBASE-17608](https://issues.apache.org/jira/browse/HBASE-17608) | Add suspend support for RawScanResultConsumer | Major | asyncclient, Client, scan |
| [HBASE-17561](https://issues.apache.org/jira/browse/HBASE-17561) | table status page should escape values that may contain arbitrary characters. | Major | master, UI |
| [HBASE-17210](https://issues.apache.org/jira/browse/HBASE-17210) | Set timeout on trying rowlock according to client's RPC timeout | Major | . |
| [HBASE-17478](https://issues.apache.org/jira/browse/HBASE-17478) | Avoid sending FSUtilization reports to master when quota support is not enabled | Trivial | . |
| [HBASE-17025](https://issues.apache.org/jira/browse/HBASE-17025) | [Shell] Support space quota get/set via the shell | Major | shell |
| [HBASE-17644](https://issues.apache.org/jira/browse/HBASE-17644) | Always create ByteBufferCells after copying to MSLAB | Major | regionserver |
| [HBASE-17619](https://issues.apache.org/jira/browse/HBASE-17619) | Add async admin Impl which connect to RegionServer and implement close region methods. | Major | asyncclient |
| [HBASE-17656](https://issues.apache.org/jira/browse/HBASE-17656) | Move new Address class from util to net package | Minor | rsgroup |
| [HBASE-17583](https://issues.apache.org/jira/browse/HBASE-17583) | Add inclusive/exclusive support for startRow and endRow of scan for sync client | Major | Client, scan |
| [HBASE-17259](https://issues.apache.org/jira/browse/HBASE-17259) | Missing functionality to remove space quota | Major | . |
| [HBASE-17001](https://issues.apache.org/jira/browse/HBASE-17001) | [RegionServer] Implement enforcement of quota violation policies | Major | regionserver |
| [HBASE-17575](https://issues.apache.org/jira/browse/HBASE-17575) | Run critical tests with each of the Inmemory Compaction Policies enabled (Towards Making BASIC the Default In-Memory Compaction Policy) | Major | test |
| [HBASE-17484](https://issues.apache.org/jira/browse/HBASE-17484) | Add non cached version of OffheapKV for write path | Major | regionserver |
| [HBASE-17389](https://issues.apache.org/jira/browse/HBASE-17389) | Convert all internal usages from ReplicationAdmin to Admin | Major | . |
| [HBASE-17402](https://issues.apache.org/jira/browse/HBASE-17402) | TestAsyncTableScan sometimes hangs | Major | Client |
| [HBASE-17350](https://issues.apache.org/jira/browse/HBASE-17350) | Fixup of regionserver group-based assignment | Critical | regionserver, rsgroup |
| [HBASE-16999](https://issues.apache.org/jira/browse/HBASE-16999) | [Master] Inform RegionServers on size quota violations | Major | . |
| [HBASE-17596](https://issues.apache.org/jira/browse/HBASE-17596) | Implement add/delete/modify column family methods | Major | Client |
| [HBASE-17349](https://issues.apache.org/jira/browse/HBASE-17349) | Add doc for regionserver group-based assignment | Critical | regionserver, rsgroup |
| [HBASE-17511](https://issues.apache.org/jira/browse/HBASE-17511) | Implement enable/disable table methods | Major | Client |
| [HBASE-17281](https://issues.apache.org/jira/browse/HBASE-17281) | FN should use datanode port from hdfs configuration | Minor | FavoredNodes |
| [HBASE-17198](https://issues.apache.org/jira/browse/HBASE-17198) | FN updates during region merge (follow up to Procedure v2 merge) | Major | FavoredNodes |
| [HBASE-17101](https://issues.apache.org/jira/browse/HBASE-17101) | FavoredNodes should not apply to system tables | Major | FavoredNodes |
| [HBASE-17346](https://issues.apache.org/jira/browse/HBASE-17346) | Add coprocessor service support | Major | asyncclient, Client, Coprocessors |
| [HBASE-17566](https://issues.apache.org/jira/browse/HBASE-17566) | Jetty upgrade fixes | Major | REST, UI |
| [HBASE-17562](https://issues.apache.org/jira/browse/HBASE-17562) | Remove documentation for coprocessor execution times after HBASE-14205 | Major | Coprocessors, Performance, regionserver |
| [HBASE-16998](https://issues.apache.org/jira/browse/HBASE-16998) | [Master] Analyze table use reports and update quota violations | Major | . |
| [HBASE-17557](https://issues.apache.org/jira/browse/HBASE-17557) | HRegionServer#reportRegionSizesForQuotas() should respond to UnsupportedOperationException | Major | . |
| [HBASE-17526](https://issues.apache.org/jira/browse/HBASE-17526) | Procedure v2 - cleanup isSuspended from MasterProcedureScheduler#Queue | Minor | proc-v2 |
| [HBASE-17500](https://issues.apache.org/jira/browse/HBASE-17500) | Implement getTable/creatTable/deleteTable/truncateTable methods | Major | Client |
| [HBASE-17045](https://issues.apache.org/jira/browse/HBASE-17045) | Unify the implementation of small scan and regular scan | Major | Client, scan |
| [HBASE-17443](https://issues.apache.org/jira/browse/HBASE-17443) | Move listReplicated/enableTableRep/disableTableRep methods from ReplicationAdmin to Admin | Major | . |
| [HBASE-17492](https://issues.apache.org/jira/browse/HBASE-17492) | Fix the compacting memstore part in hbase shell ruby script | Major | . |
| [HBASE-17491](https://issues.apache.org/jira/browse/HBASE-17491) | Remove all setters from HTable interface and introduce a TableBuilder to build Table instance | Major | . |
| [HBASE-17067](https://issues.apache.org/jira/browse/HBASE-17067) | Procedure v2 - remove tryAcquire\*Lock and use wait/wake to make framework event based | Major | proc-v2 |
| [HBASE-17367](https://issues.apache.org/jira/browse/HBASE-17367) | Make HTable#getBufferedMutator thread safe | Major | . |
| [HBASE-17497](https://issues.apache.org/jira/browse/HBASE-17497) | Add first async MetaTableAccessor impl and Implement tableExists method | Major | Client |
| [HBASE-17498](https://issues.apache.org/jira/browse/HBASE-17498) | Implement listTables and listTableNames methods | Major | Client |
| [HBASE-16831](https://issues.apache.org/jira/browse/HBASE-16831) | Procedure V2 - Remove org.apache.hadoop.hbase.zookeeper.lock | Minor | . |
| [HBASE-16867](https://issues.apache.org/jira/browse/HBASE-16867) | Procedure V2 - Check ACLs for remote HBaseLock | Major | . |
| [HBASE-17480](https://issues.apache.org/jira/browse/HBASE-17480) | Remove split region code from Region Server | Major | Region Assignment |
| [HBASE-17396](https://issues.apache.org/jira/browse/HBASE-17396) | Add first async admin impl and implement balance methods | Major | Client |
| [HBASE-17483](https://issues.apache.org/jira/browse/HBASE-17483) | Add equals/hashcode for OffheapKeyValue | Major | regionserver |
| [HBASE-17081](https://issues.apache.org/jira/browse/HBASE-17081) | Flush the entire CompactingMemStore content to disk | Major | . |
| [HBASE-17372](https://issues.apache.org/jira/browse/HBASE-17372) | Make AsyncTable thread safe | Major | asyncclient, Client |
| [HBASE-16744](https://issues.apache.org/jira/browse/HBASE-16744) | Procedure V2 - Lock procedures to allow clients to acquire locks on tables/namespaces/regions | Major | . |
| [HBASE-17416](https://issues.apache.org/jira/browse/HBASE-17416) | Use isEmpty instead of size() == 0 in hbase-protocol-shaded | Minor | . |
| [HBASE-14061](https://issues.apache.org/jira/browse/HBASE-14061) | Support CF-level Storage Policy | Major | HFile, regionserver |
| [HBASE-17337](https://issues.apache.org/jira/browse/HBASE-17337) | list replication peers request should be routed through master | Major | . |
| [HBASE-12148](https://issues.apache.org/jira/browse/HBASE-12148) | Remove TimeRangeTracker as point of contention when many threads writing a Store | Major | Performance |
| [HBASE-15172](https://issues.apache.org/jira/browse/HBASE-15172) | Support setting storage policy in bulkload | Major | . |
| [HBASE-17388](https://issues.apache.org/jira/browse/HBASE-17388) | Move ReplicationPeer and other replication related PB messages to the replication.proto | Major | Replication |
| [HBASE-17409](https://issues.apache.org/jira/browse/HBASE-17409) | Re-fix XSS request issue in JMXJsonServlet | Major | security, UI |
| [HBASE-17410](https://issues.apache.org/jira/browse/HBASE-17410) | Use isEmpty instead of size() == 0 in hbase-client | Minor | Client |
| [HBASE-17373](https://issues.apache.org/jira/browse/HBASE-17373) | Reverse the order of snapshot creation in the CompactingMemStore | Major | . |
| [HBASE-17336](https://issues.apache.org/jira/browse/HBASE-17336) | get/update replication peer config requests should be routed through master | Major | . |
| [HBASE-17149](https://issues.apache.org/jira/browse/HBASE-17149) | Procedure V2 - Fix nonce submission to avoid unnecessary calling coprocessor multiple times | Major | proc-v2 |
| [HBASE-17320](https://issues.apache.org/jira/browse/HBASE-17320) | Add inclusive/exclusive support for startRow and endRow of scan | Major | Client, scan |
| [HBASE-17090](https://issues.apache.org/jira/browse/HBASE-17090) | Procedure v2 - fast wake if nothing else is running | Major | proc-v2 |
| [HBASE-17068](https://issues.apache.org/jira/browse/HBASE-17068) | Procedure v2 - inherit region locks | Major | master, proc-v2 |
| [HBASE-16524](https://issues.apache.org/jira/browse/HBASE-16524) | Procedure v2 - Compute WALs cleanup on wal modification and not on every sync | Minor | proc-v2 |
| [HBASE-17345](https://issues.apache.org/jira/browse/HBASE-17345) | Implement batch | Major | asyncclient, Client |
| [HBASE-17335](https://issues.apache.org/jira/browse/HBASE-17335) | enable/disable replication peer requests should be routed through master | Major | . |
| [HBASE-17334](https://issues.apache.org/jira/browse/HBASE-17334) | Add locate row before/after support for AsyncRegionLocator | Major | Client |
| [HBASE-17262](https://issues.apache.org/jira/browse/HBASE-17262) | Refactor RpcServer so as to make it extendable and/or pluggable | Major | rpc |
| [HBASE-11392](https://issues.apache.org/jira/browse/HBASE-11392) | add/remove peer requests should be routed through master | Critical | . |
| [HBASE-17107](https://issues.apache.org/jira/browse/HBASE-17107) | FN info should be cleaned up on region/table cleanup | Major | FavoredNodes |
| [HBASE-17142](https://issues.apache.org/jira/browse/HBASE-17142) | Implement multi get | Major | asyncclient, Client |
| [HBASE-17282](https://issues.apache.org/jira/browse/HBASE-17282) | Reduce the redundant requests to meta table | Major | Client |
| [HBASE-17148](https://issues.apache.org/jira/browse/HBASE-17148) | Procedure v2 - add bulk proc submit | Minor | master, proc-v2 |
| [HBASE-16398](https://issues.apache.org/jira/browse/HBASE-16398) | optimize HRegion computeHDFSBlocksDistribution | Major | regionserver |
| [HBASE-15787](https://issues.apache.org/jira/browse/HBASE-15787) | Change the flush related heuristics to work with offheap size configured | Major | regionserver |
| [HBASE-17000](https://issues.apache.org/jira/browse/HBASE-17000) | [RegionServer] Compute region filesystem space use and report to Master | Major | regionserver |
| [HBASE-17316](https://issues.apache.org/jira/browse/HBASE-17316) | Addendum to HBASE-17294, 'External Configuration for Memory Compaction' | Major | . |
| [HBASE-17313](https://issues.apache.org/jira/browse/HBASE-17313) | Add BufferedMutatorParams#clone method | Major | Client |
| [HBASE-17277](https://issues.apache.org/jira/browse/HBASE-17277) | Allow alternate BufferedMutator implementation | Major | . |
| [HBASE-17294](https://issues.apache.org/jira/browse/HBASE-17294) | External Configuration for Memory Compaction | Major | . |
| [HBASE-16336](https://issues.apache.org/jira/browse/HBASE-16336) | Removing peers seems to be leaving spare queues | Major | Replication |
| [HBASE-17251](https://issues.apache.org/jira/browse/HBASE-17251) | Add a timeout parameter when locating region | Major | asyncclient, Client |
| [HBASE-16941](https://issues.apache.org/jira/browse/HBASE-16941) | FavoredNodes - Split/Merge code paths | Major | FavoredNodes |
| [HBASE-17260](https://issues.apache.org/jira/browse/HBASE-17260) | Procedure v2 - Add setOwner() overload taking a User instance | Trivial | proc-v2 |
| [HBASE-16996](https://issues.apache.org/jira/browse/HBASE-16996) | Implement storage/retrieval of filesystem-use quotas into quota table | Major | . |
| [HBASE-17111](https://issues.apache.org/jira/browse/HBASE-17111) | Use Apache CLI in SnapshotInfo tool | Major | . |
| [HBASE-16648](https://issues.apache.org/jira/browse/HBASE-16648) | [JDK8] Use computeIfAbsent instead of get and putIfAbsent | Major | Performance |
| [HBASE-17167](https://issues.apache.org/jira/browse/HBASE-17167) | Pass mvcc to client when scan | Major | Client, scan |
| [HBASE-17012](https://issues.apache.org/jira/browse/HBASE-17012) | Handle Offheap cells in CompressedKvEncoder | Major | regionserver |
| [HBASE-17048](https://issues.apache.org/jira/browse/HBASE-17048) | Calcuate suitable ByteBuf size when allocating send buffer in FanOutOneBlockAsyncDFSOutput | Major | wal |
| [HBASE-17183](https://issues.apache.org/jira/browse/HBASE-17183) | Handle ByteBufferCell while making TagRewriteCell | Major | regionserver |
| [HBASE-17162](https://issues.apache.org/jira/browse/HBASE-17162) | Avoid unconditional call to getXXXArray() in write path | Major | regionserver |
| [HBASE-17169](https://issues.apache.org/jira/browse/HBASE-17169) | Remove Cell variants with ShareableMemory | Major | regionserver |
| [HBASE-16984](https://issues.apache.org/jira/browse/HBASE-16984) | Implement getScanner | Major | Client |
| [HBASE-15786](https://issues.apache.org/jira/browse/HBASE-15786) | Create DBB backed MSLAB pool | Major | regionserver |
| [HBASE-17141](https://issues.apache.org/jira/browse/HBASE-17141) | Introduce a more user-friendly implementation of AsyncTable | Major | asyncclient, Client |
| [HBASE-16995](https://issues.apache.org/jira/browse/HBASE-16995) | Build client Java API and client protobuf messages | Major | Client |
| [HBASE-17139](https://issues.apache.org/jira/browse/HBASE-17139) | Remove sweep tool related configs from hbase-default.xml | Major | . |
| [HBASE-16956](https://issues.apache.org/jira/browse/HBASE-16956) | Refactor FavoredNodePlan to use regionNames as keys | Minor | FavoredNodes |
| [HBASE-17085](https://issues.apache.org/jira/browse/HBASE-17085) | AsyncFSWAL may issue unnecessary AsyncDFSOutput.sync | Major | wal |
| [HBASE-16169](https://issues.apache.org/jira/browse/HBASE-16169) | Make RegionSizeCalculator scalable | Major | mapreduce, scaling |
| [HBASE-17073](https://issues.apache.org/jira/browse/HBASE-17073) | Increase the max number of buffers in ByteBufferPool | Major | . |
| [HBASE-17087](https://issues.apache.org/jira/browse/HBASE-17087) | Enable Aliasing for CodedInputStream created by ByteInputByteString#newCodedInput | Major | regionserver |
| [HBASE-17089](https://issues.apache.org/jira/browse/HBASE-17089) | Add doc on experience running with hedged reads | Major | documentation |
| [HBASE-15788](https://issues.apache.org/jira/browse/HBASE-15788) | Use Offheap ByteBuffers from BufferPool to read RPC requests. | Major | regionserver |
| [HBASE-16838](https://issues.apache.org/jira/browse/HBASE-16838) | Implement basic scan | Major | asyncclient, Client |
| [HBASE-17071](https://issues.apache.org/jira/browse/HBASE-17071) | Do not initialize MemstoreChunkPool when use mslab option is turned off | Major | . |
| [HBASE-16570](https://issues.apache.org/jira/browse/HBASE-16570) | Compute region locality in parallel at startup | Major | . |
| [HBASE-17053](https://issues.apache.org/jira/browse/HBASE-17053) | Remove LogRollerExitedChecker | Major | wal |
| [HBASE-17035](https://issues.apache.org/jira/browse/HBASE-17035) | Check why we roll a wal writer at 10MB when the configured roll size is 120M+ with AsyncFSWAL | Major | wal |
| [HBASE-17021](https://issues.apache.org/jira/browse/HBASE-17021) | Use RingBuffer to reduce the contention in AsyncFSWAL | Major | wal |
| [HBASE-16982](https://issues.apache.org/jira/browse/HBASE-16982) | Better integrate Apache CLI in AbstractHBaseTool | Major | . |
| [HBASE-17050](https://issues.apache.org/jira/browse/HBASE-17050) | Upgrade Apache CLI version from 1.2 to 1.3.1 | Minor | . |
| [HBASE-17030](https://issues.apache.org/jira/browse/HBASE-17030) | Procedure v2 - A couple of tweaks to the SplitTableRegionProcedure | Trivial | proc-v2 |
| [HBASE-16937](https://issues.apache.org/jira/browse/HBASE-16937) | Replace SnapshotType protobuf conversion when we can directly use the pojo object | Trivial | snapshots |
| [HBASE-16892](https://issues.apache.org/jira/browse/HBASE-16892) | Use TableName instead of String in SnapshotDescription | Trivial | snapshots |
| [HBASE-16865](https://issues.apache.org/jira/browse/HBASE-16865) | Procedure v2 - Inherit lock from root proc | Major | proc-v2 |
| [HBASE-16970](https://issues.apache.org/jira/browse/HBASE-16970) | Clarify misleading Scan.java comment about caching | Trivial | . |
| [HBASE-16986](https://issues.apache.org/jira/browse/HBASE-16986) | Add note on how scanner caching has changed since 0.98 to refguid | Minor | documentation |
| [HBASE-16608](https://issues.apache.org/jira/browse/HBASE-16608) | Introducing the ability to merge ImmutableSegments without copy-compaction or SQM usage | Major | . |
| [HBASE-16945](https://issues.apache.org/jira/browse/HBASE-16945) | Implement AsyncRegionLocator | Major | Client |
| [HBASE-16968](https://issues.apache.org/jira/browse/HBASE-16968) | Refactor FanOutOneBlockAsyncDFSOutput | Major | io, wal |
| [HBASE-16954](https://issues.apache.org/jira/browse/HBASE-16954) | Unify HTable#checkAndDelete with AP | Minor | . |
| [HBASE-16891](https://issues.apache.org/jira/browse/HBASE-16891) | Try copying to the Netty ByteBuf directly from the WALEdit | Major | wal |
| [HBASE-16932](https://issues.apache.org/jira/browse/HBASE-16932) | Implement small scan | Major | Client |
| [HBASE-16835](https://issues.apache.org/jira/browse/HBASE-16835) | Revisit the zookeeper usage at client side | Major | Client, Zookeeper |
| [HBASE-15709](https://issues.apache.org/jira/browse/HBASE-15709) | Handle large edits for asynchronous WAL | Critical | io, wal |
| [HBASE-15789](https://issues.apache.org/jira/browse/HBASE-15789) | PB related changes to work with offheap | Major | regionserver |
| [HBASE-16871](https://issues.apache.org/jira/browse/HBASE-16871) | Procedure v2 - add waiting procs back to the queue after restart | Major | proc-v2 |
| [HBASE-16872](https://issues.apache.org/jira/browse/HBASE-16872) | Implement mutateRow and checkAndMutate | Major | Client |
| [HBASE-16874](https://issues.apache.org/jira/browse/HBASE-16874) | Fix TestMasterFailoverWithProcedures and ensure single proc-executor for kill/restart tests | Minor | proc-v2 |
| [HBASE-16864](https://issues.apache.org/jira/browse/HBASE-16864) | Procedure v2 - Fix StateMachineProcedure support for child procs at last step | Major | proc-v2 |
| [HBASE-16837](https://issues.apache.org/jira/browse/HBASE-16837) | Implement checkAndPut and checkAndDelete | Major | Client |
| [HBASE-16836](https://issues.apache.org/jira/browse/HBASE-16836) | Implement increment and append | Major | Client |
| [HBASE-16846](https://issues.apache.org/jira/browse/HBASE-16846) | Procedure v2 - executor cleanup | Minor | proc-v2 |
| [HBASE-16834](https://issues.apache.org/jira/browse/HBASE-16834) | Add AsyncConnection support for ConnectionFactory | Major | Client |
| [HBASE-16839](https://issues.apache.org/jira/browse/HBASE-16839) | Procedure v2 - Move all protobuf handling to ProcedureUtil | Minor | proc-v2 |
| [HBASE-16642](https://issues.apache.org/jira/browse/HBASE-16642) | Procedure V2: Use DelayQueue instead of TimeoutBlockingQueue | Minor | proc-v2 |
| [HBASE-16813](https://issues.apache.org/jira/browse/HBASE-16813) | Procedure v2 - Move ProcedureEvent to hbase-procedure module | Major | proc-v2 |
| [HBASE-16735](https://issues.apache.org/jira/browse/HBASE-16735) | Procedure v2 - Fix yield while holding locks | Major | proc-v2 |
| [HBASE-16505](https://issues.apache.org/jira/browse/HBASE-16505) | Save deadline in RpcCallContext according to request's timeout | Major | . |
| [HBASE-15561](https://issues.apache.org/jira/browse/HBASE-15561) | See how G1GC works with MSLAB and chunk pool | Major | . |
| [HBASE-16802](https://issues.apache.org/jira/browse/HBASE-16802) | Procedure v2 - group procedure cleaning | Trivial | proc-v2 |
| [HBASE-16146](https://issues.apache.org/jira/browse/HBASE-16146) | Counters are expensive... | Major | metrics |
| [HBASE-16788](https://issues.apache.org/jira/browse/HBASE-16788) | Race in compacted file deletion between HStore close() and closeAndArchiveCompactedFiles() | Blocker | regionserver |
| [HBASE-14734](https://issues.apache.org/jira/browse/HBASE-14734) | BindException when setting up MiniKdc | Major | flakey, test |
| [HBASE-15984](https://issues.apache.org/jira/browse/HBASE-15984) | Given failure to parse a given WAL that was closed cleanly, replay the WAL. | Critical | Replication |
| [HBASE-15721](https://issues.apache.org/jira/browse/HBASE-15721) | Optimization in cloning cells into MSLAB | Major | regionserver |
| [HBASE-16372](https://issues.apache.org/jira/browse/HBASE-16372) | References to previous cell in read path should be avoided | Blocker | Scanners |
| [HBASE-16759](https://issues.apache.org/jira/browse/HBASE-16759) | Avoid ByteString.copyFrom usage wherever possible | Major | Protobufs |
| [HBASE-16758](https://issues.apache.org/jira/browse/HBASE-16758) | Bring back HBaseZeroCopyByteStringer stuff | Major | Protobufs |
| [HBASE-16760](https://issues.apache.org/jira/browse/HBASE-16760) | Deprecate ByteString related methods in Bytes.java | Major | Protobufs |
| [HBASE-16741](https://issues.apache.org/jira/browse/HBASE-16741) | Amend the generate protobufs out-of-band build step to include shade, pulling in protobuf source and a hook for patching protobuf | Major | Protobufs |
| [HBASE-16264](https://issues.apache.org/jira/browse/HBASE-16264) | Figure how to deal with endpoints and shaded pb | Critical | Coprocessors, Protobufs |
| [HBASE-16742](https://issues.apache.org/jira/browse/HBASE-16742) | Add chapter for devs on how we do protobufs going forward | Major | documentation |
| [HBASE-16738](https://issues.apache.org/jira/browse/HBASE-16738) | L1 cache caching shared memory HFile block when blocks promoted from L2 to L1 | Major | regionserver, Scanners |
| [HBASE-16134](https://issues.apache.org/jira/browse/HBASE-16134) | Introduce Cell extension for server side. | Major | regionserver |
| [HBASE-16695](https://issues.apache.org/jira/browse/HBASE-16695) | Procedure v2 - Support for parent holding locks | Major | proc-v2 |
| [HBASE-16587](https://issues.apache.org/jira/browse/HBASE-16587) | Procedure v2 - Cleanup suspended proc execution | Major | proc-v2 |
| [HBASE-16651](https://issues.apache.org/jira/browse/HBASE-16651) | LRUBlockCache#returnBlock should try return block to Victim Handler L2 cache. | Major | regionserver, Scanners |
| [HBASE-16554](https://issues.apache.org/jira/browse/HBASE-16554) | Procedure V2 - Recover 'updated' part of WAL tracker if trailer is corrupted. | Major | . |
| [HBASE-7612](https://issues.apache.org/jira/browse/HBASE-7612) | [JDK8] Replace use of high-scale-lib counters with intrinsic facilities | Trivial | metrics |
| [HBASE-16534](https://issues.apache.org/jira/browse/HBASE-16534) | Procedure v2 - Perf Tool for Scheduler | Major | proc-v2, tooling |
| [HBASE-16586](https://issues.apache.org/jira/browse/HBASE-16586) | Procedure v2 - Cleanup sched wait/lock semantic | Major | proc-v2 |
| [HBASE-16626](https://issues.apache.org/jira/browse/HBASE-16626) | User customized RegionScanner from 1.X is incompatible with 2.0.0's off-heap part | Major | Offheaping |
| [HBASE-16618](https://issues.apache.org/jira/browse/HBASE-16618) | Procedure v2 - Add base class for table and ns procedures | Minor | master, proc-v2 |
| [HBASE-16229](https://issues.apache.org/jira/browse/HBASE-16229) | Cleaning up size and heapSize calculation | Major | . |
| [HBASE-16592](https://issues.apache.org/jira/browse/HBASE-16592) | Unify Delete request with AP | Major | . |
| [HBASE-16596](https://issues.apache.org/jira/browse/HBASE-16596) | Reduce redundant interfaces in AsyncProcess | Major | . |
| [HBASE-16530](https://issues.apache.org/jira/browse/HBASE-16530) | Reduce DBE code duplication | Major | Performance |
| [HBASE-16445](https://issues.apache.org/jira/browse/HBASE-16445) | Refactor and reimplement RpcClient | Major | IPC/RPC, rpc |
| [HBASE-16516](https://issues.apache.org/jira/browse/HBASE-16516) | Revisit the implementation of PayloadCarryingRpcController | Major | rpc |
| [HBASE-16101](https://issues.apache.org/jira/browse/HBASE-16101) | Procedure v2 - Perf Tool for WAL | Major | proc-v2, tooling |
| [HBASE-16311](https://issues.apache.org/jira/browse/HBASE-16311) | Audit log for delete snapshot operation is missing in case of snapshot owner deleting the same | Minor | snapshots |
| [HBASE-16519](https://issues.apache.org/jira/browse/HBASE-16519) | Procedure v2 - Avoid sync wait on DDLs operation | Major | master, proc-v2 |
| [HBASE-16507](https://issues.apache.org/jira/browse/HBASE-16507) | Procedure v2 - Force DDL operation to always roll forward | Minor | master, proc-v2 |
| [HBASE-16526](https://issues.apache.org/jira/browse/HBASE-16526) | Add more ipc tests | Major | rpc, test |
| [HBASE-16532](https://issues.apache.org/jira/browse/HBASE-16532) | Procedure-V2: Enforce procedure ownership at submission | Major | proc-v2 |
| [HBASE-16531](https://issues.apache.org/jira/browse/HBASE-16531) | Move cell block related code out of IPCUtil | Major | rpc |
| [HBASE-16533](https://issues.apache.org/jira/browse/HBASE-16533) | Procedure v2 - Extract chore from the executor | Minor | proc-v2 |
| [HBASE-16522](https://issues.apache.org/jira/browse/HBASE-16522) | Procedure v2 - Cache system user and avoid IOException | Major | master, proc-v2 |
| [HBASE-16082](https://issues.apache.org/jira/browse/HBASE-16082) | Procedure v2 - Move out helpers from MasterProcedureScheduler | Trivial | proc-v2 |
| [HBASE-16510](https://issues.apache.org/jira/browse/HBASE-16510) | Reset RpcController before retry | Major | rpc |
| [HBASE-16407](https://issues.apache.org/jira/browse/HBASE-16407) | Handle MemstoreChunkPool size when HeapMemoryManager tunes memory | Major | . |
| [HBASE-16433](https://issues.apache.org/jira/browse/HBASE-16433) | Remove AsyncRpcChannel related stuffs | Major | rpc |
| [HBASE-16474](https://issues.apache.org/jira/browse/HBASE-16474) | Remove dfs.support.append related code and documentation | Major | fs, regionserver, wal |
| [HBASE-16451](https://issues.apache.org/jira/browse/HBASE-16451) | Procedure v2 - Test WAL protobuf entry size limit | Minor | proc-v2 |
| [HBASE-14921](https://issues.apache.org/jira/browse/HBASE-14921) | Inmemory Compaction Optimizations; Segment Structure | Major | . |
| [HBASE-16485](https://issues.apache.org/jira/browse/HBASE-16485) | Procedure V2 - Add support to addChildProcedure() as last "step" in StateMachineProcedure | Minor | proc-v2 |
| [HBASE-16440](https://issues.apache.org/jira/browse/HBASE-16440) | MemstoreChunkPool might cross its maxCount of chunks to pool | Major | . |
| [HBASE-16318](https://issues.apache.org/jira/browse/HBASE-16318) | fail build if license isn't in whitelist | Major | build, dependencies |
| [HBASE-16452](https://issues.apache.org/jira/browse/HBASE-16452) | Procedure v2 - Make ProcedureWALPrettyPrinter extend Tool | Minor | proc-v2 |
| [HBASE-16405](https://issues.apache.org/jira/browse/HBASE-16405) | Change read path Bloom check to work with Cells with out any copy | Major | Compaction |
| [HBASE-16094](https://issues.apache.org/jira/browse/HBASE-16094) | Procedure v2 - Improve cleaning up of proc wals | Major | proc-v2 |
| [HBASE-16378](https://issues.apache.org/jira/browse/HBASE-16378) | Procedure v2 - Make ProcedureException extend HBaseException | Trivial | proc-v2 |
| [HBASE-16404](https://issues.apache.org/jira/browse/HBASE-16404) | Make DeleteBloomFilters work with BloomContext | Minor | Compaction |
| [HBASE-15554](https://issues.apache.org/jira/browse/HBASE-15554) | StoreFile$Writer.appendGeneralBloomFilter generates extra KV | Major | Performance |
| [HBASE-16308](https://issues.apache.org/jira/browse/HBASE-16308) | Contain protobuf references | Major | Protobufs |
| [HBASE-16285](https://issues.apache.org/jira/browse/HBASE-16285) | Drop RPC requests if it must be considered as timeout at client | Major | . |
| [HBASE-16263](https://issues.apache.org/jira/browse/HBASE-16263) | Move all to do w/ protobuf -- \*.proto files and generated classes -- under hbase-protocol | Major | Protobufs |
| [HBASE-16317](https://issues.apache.org/jira/browse/HBASE-16317) | revert all ESAPI changes | Blocker | dependencies, security |
| [HBASE-16286](https://issues.apache.org/jira/browse/HBASE-16286) | When TagRewriteCell are not copied to MSLAB, deep clone it while adding to Memstore | Major | regionserver |
| [HBASE-16280](https://issues.apache.org/jira/browse/HBASE-16280) | Use hash based map in SequenceIdAccounting | Major | wal |
| [HBASE-16205](https://issues.apache.org/jira/browse/HBASE-16205) | When Cells are not copied to MSLAB, deep clone it while adding to Memstore | Critical | regionserver |
| [HBASE-14552](https://issues.apache.org/jira/browse/HBASE-14552) | Procedure V2: Reimplement DispatchMergingRegionHandler | Major | proc-v2 |
| [HBASE-16236](https://issues.apache.org/jira/browse/HBASE-16236) | Typo in javadoc of InstancePending | Trivial | Zookeeper |
| [HBASE-16233](https://issues.apache.org/jira/browse/HBASE-16233) | Procedure V2: Support acquire/release shared table lock concurrently | Major | proc-v2 |
| [HBASE-16219](https://issues.apache.org/jira/browse/HBASE-16219) | Move meta bootstrap out of HMaster | Trivial | master, Region Assignment |
| [HBASE-15305](https://issues.apache.org/jira/browse/HBASE-15305) | Fix a couple of incorrect anchors in HBase ref guide | Major | documentation |
| [HBASE-16195](https://issues.apache.org/jira/browse/HBASE-16195) | Should not add chunk into chunkQueue if not using chunk pool in HeapMemStoreLAB | Major | . |
| [HBASE-16208](https://issues.apache.org/jira/browse/HBASE-16208) | Make TableBasedReplicationQueuesImpl check that queue exists before attempting to remove it | Major | Replication |
| [HBASE-16214](https://issues.apache.org/jira/browse/HBASE-16214) | Add in UI description of Replication Table | Minor | Replication |
| [HBASE-16092](https://issues.apache.org/jira/browse/HBASE-16092) | Procedure v2 - complete child procedure support | Minor | proc-v2 |
| [HBASE-16194](https://issues.apache.org/jira/browse/HBASE-16194) | Should count in MSLAB chunk allocation into heap size change when adding duplicate cells | Major | regionserver |
| [HBASE-16176](https://issues.apache.org/jira/browse/HBASE-16176) | Bug fixes/improvements on HBASE-15650 Remove TimeRangeTracker as point of contention when many threads reading a StoreFile | Major | Performance |
| [HBASE-15935](https://issues.apache.org/jira/browse/HBASE-15935) | Have a separate Walker task running concurrently with Generator | Minor | integration tests |
| [HBASE-16162](https://issues.apache.org/jira/browse/HBASE-16162) | Compacting Memstore : unnecessary push of active segments to pipeline | Critical | . |
| [HBASE-15985](https://issues.apache.org/jira/browse/HBASE-15985) | clarify promises about edits from replication in ref guide | Major | documentation, Replication |
| [HBASE-16163](https://issues.apache.org/jira/browse/HBASE-16163) | Compacting Memstore : CompactionPipeline#addFirst can use LinkedList#addFirst | Minor | . |
| [HBASE-16164](https://issues.apache.org/jira/browse/HBASE-16164) | Missing close of new compacted segments in few occasions which might leak MSLAB chunks from pool | Critical | . |
| [HBASE-16155](https://issues.apache.org/jira/browse/HBASE-16155) | Compacting Memstore : Few log improvements | Minor | . |
| [HBASE-16153](https://issues.apache.org/jira/browse/HBASE-16153) | Correct the config name 'hbase.memestore.inmemoryflush.threshold.factor' | Trivial | . |
| [HBASE-16143](https://issues.apache.org/jira/browse/HBASE-16143) | Change MemstoreScanner constructor to accept List\<KeyValueScanner\> | Minor | . |
| [HBASE-16121](https://issues.apache.org/jira/browse/HBASE-16121) | Require only MasterServices to the ServerManager constructor | Trivial | master |
| [HBASE-16068](https://issues.apache.org/jira/browse/HBASE-16068) | Procedure v2 - use consts for conf properties in tests | Trivial | proc-v2, test |
| [HBASE-16083](https://issues.apache.org/jira/browse/HBASE-16083) | Fix table based replication related configs | Trivial | Replication |
| [HBASE-16080](https://issues.apache.org/jira/browse/HBASE-16080) | Fix flakey tests | Critical | Replication |
| [HBASE-16036](https://issues.apache.org/jira/browse/HBASE-16036) | Fix ReplicationTableBase initialization to make it non-blocking | Major | Replication |
| [HBASE-14878](https://issues.apache.org/jira/browse/HBASE-14878) | maven archetype: client application with shaded jars | Major | build, Usability |
| [HBASE-14877](https://issues.apache.org/jira/browse/HBASE-14877) | maven archetype: client application | Major | build, Usability |
| [HBASE-16056](https://issues.apache.org/jira/browse/HBASE-16056) | Procedure v2 - fix master crash for FileNotFound | Minor | proc-v2 |
| [HBASE-16038](https://issues.apache.org/jira/browse/HBASE-16038) | Ignore JVM crashes or machine shutdown failures in report-flakies | Major | . |
| [HBASE-15999](https://issues.apache.org/jira/browse/HBASE-15999) | NPE in MemstoreCompactor | Critical | . |
| [HBASE-16034](https://issues.apache.org/jira/browse/HBASE-16034) | Fix ProcedureTestingUtility#LoadCounter.setMaxProcId() | Minor | proc-v2, test |
| [HBASE-15974](https://issues.apache.org/jira/browse/HBASE-15974) | Create a ReplicationQueuesClientHBaseImpl | Major | Replication |
| [HBASE-16023](https://issues.apache.org/jira/browse/HBASE-16023) | Fastpath for the FIFO rpcscheduler | Major | Performance, rpc |
| [HBASE-15525](https://issues.apache.org/jira/browse/HBASE-15525) | OutOfMemory could occur when using BoundedByteBufferPool during RPC bursts | Critical | IPC/RPC |
| [HBASE-15991](https://issues.apache.org/jira/browse/HBASE-15991) | CompactingMemstore#InMemoryFlushRunnable should implement Comparable/Comparator | Critical | . |
| [HBASE-15272](https://issues.apache.org/jira/browse/HBASE-15272) | Add error handling for split and compact actions in table.jsp | Major | UI |
| [HBASE-15994](https://issues.apache.org/jira/browse/HBASE-15994) | Allow selection of RpcSchedulers | Major | . |
| [HBASE-15107](https://issues.apache.org/jira/browse/HBASE-15107) | Procedure V2 - Procedure Queue with Regions | Major | proc-v2 |
| [HBASE-15948](https://issues.apache.org/jira/browse/HBASE-15948) | Port "HADOOP-9956 RPC listener inefficiently assigns connections to readers" | Major | IPC/RPC |
| [HBASE-15174](https://issues.apache.org/jira/browse/HBASE-15174) | Client Public API should not have PB objects in 2.0 | Blocker | . |
| [HBASE-15883](https://issues.apache.org/jira/browse/HBASE-15883) | Adding WAL files and tracking offsets in HBase. | Major | Replication |
| [HBASE-15927](https://issues.apache.org/jira/browse/HBASE-15927) | Remove HMaster.assignRegion() | Trivial | test |
| [HBASE-15917](https://issues.apache.org/jira/browse/HBASE-15917) | Flaky tests dashboard | Major | . |
| [HBASE-15919](https://issues.apache.org/jira/browse/HBASE-15919) | Document @Rule vs @ClassRule. Also clarify timeout limits are on TestCase. | Minor | . |
| [HBASE-15915](https://issues.apache.org/jira/browse/HBASE-15915) | Set timeouts on hanging tests | Major | . |
| [HBASE-15896](https://issues.apache.org/jira/browse/HBASE-15896) | Add timeout tests to flaky list from report-flakies.py | Major | test |
| [HBASE-14920](https://issues.apache.org/jira/browse/HBASE-14920) | Compacting Memstore | Major | . |
| [HBASE-15872](https://issues.apache.org/jira/browse/HBASE-15872) | Split TestWALProcedureStore | Trivial | proc-v2, test |
| [HBASE-15865](https://issues.apache.org/jira/browse/HBASE-15865) | Move TestTableDeleteFamilyHandler and TestTableDescriptorModification handler tests to procedure | Trivial | test |
| [HBASE-15651](https://issues.apache.org/jira/browse/HBASE-15651) | Add report-flakies.py to use jenkins api to get failing tests | Major | . |
| [HBASE-15825](https://issues.apache.org/jira/browse/HBASE-15825) | Fix the null pointer in DynamicLogicExpressionSuite | Major | . |
| [HBASE-15813](https://issues.apache.org/jira/browse/HBASE-15813) | Rename DefaultWALProvider to a more specific name and clean up unnecessary reference to it | Major | wal |
| [HBASE-15785](https://issues.apache.org/jira/browse/HBASE-15785) | Unnecessary lock in ByteBufferArray | Major | regionserver, Scanners |
| [HBASE-15740](https://issues.apache.org/jira/browse/HBASE-15740) | Replication source.shippedKBs metric is undercounting because it is in KB | Major | . |
| [HBASE-15776](https://issues.apache.org/jira/browse/HBASE-15776) | Replace master.am.getTableStateManager() with the direct master.getTableStateManager() | Trivial | master |
| [HBASE-15778](https://issues.apache.org/jira/browse/HBASE-15778) | replace master.am and master.sm direct access with getter calls | Trivial | master |
| [HBASE-15743](https://issues.apache.org/jira/browse/HBASE-15743) | Add Transparent Data Encryption support for FanOutOneBlockAsyncDFSOutput | Major | wal |
| [HBASE-15763](https://issues.apache.org/jira/browse/HBASE-15763) | Isolate Wal related stuff from MasterFileSystem | Trivial | master, wal |
| [HBASE-15754](https://issues.apache.org/jira/browse/HBASE-15754) | Add testcase for AES encryption | Major | wal |
| [HBASE-15337](https://issues.apache.org/jira/browse/HBASE-15337) | Document date tiered compaction in the book | Major | documentation |
| [HBASE-15675](https://issues.apache.org/jira/browse/HBASE-15675) | Add more details about region on table.jsp | Major | . |
| [HBASE-15658](https://issues.apache.org/jira/browse/HBASE-15658) | RegionServerCallable / RpcRetryingCaller clear meta cache on retries | Critical | Client |
| [HBASE-15735](https://issues.apache.org/jira/browse/HBASE-15735) | Tightening of the CP contract | Major | regionserver, Scanners |
| [HBASE-15477](https://issues.apache.org/jira/browse/HBASE-15477) | Do not save 'next block header' when we cache hfileblocks | Major | BlockCache, Performance |
| [HBASE-15689](https://issues.apache.org/jira/browse/HBASE-15689) | Changes to hbase-personality.sh to include/exclude flaky tests | Major | . |
| [HBASE-15628](https://issues.apache.org/jira/browse/HBASE-15628) | Implement an AsyncOutputStream which can work with any FileSystem implementation | Major | . |
| [HBASE-15579](https://issues.apache.org/jira/browse/HBASE-15579) | Procedure V2 - Remove synchronized around nonce in Procedure submit | Trivial | proc-v2 |
| [HBASE-15392](https://issues.apache.org/jira/browse/HBASE-15392) | Single Cell Get reads two HFileBlocks | Major | BucketCache |
| [HBASE-15671](https://issues.apache.org/jira/browse/HBASE-15671) | Add per-table metrics on memstore, storefile and regionsize | Major | . |
| [HBASE-15366](https://issues.apache.org/jira/browse/HBASE-15366) | Add doc, trace-level logging, and test around hfileblock | Major | BlockCache |
| [HBASE-15683](https://issues.apache.org/jira/browse/HBASE-15683) | Min latency in latency histograms are emitted as Long.MAX\_VALUE | Major | . |
| [HBASE-15368](https://issues.apache.org/jira/browse/HBASE-15368) | Add pluggable window support | Major | Compaction |
| [HBASE-15663](https://issues.apache.org/jira/browse/HBASE-15663) | Hook up JvmPauseMonitor to ThriftServer | Major | metrics, Thrift |
| [HBASE-15662](https://issues.apache.org/jira/browse/HBASE-15662) | Hook up JvmPauseMonitor to REST server | Major | metrics, REST |
| [HBASE-15518](https://issues.apache.org/jira/browse/HBASE-15518) | Add Per-Table metrics back | Major | . |
| [HBASE-15640](https://issues.apache.org/jira/browse/HBASE-15640) | L1 cache doesn't give fair warning that it is showing partial stats only when it hits limit | Major | BlockCache |
| [HBASE-15386](https://issues.apache.org/jira/browse/HBASE-15386) | PREFETCH\_BLOCKS\_ON\_OPEN in HColumnDescriptor is ignored | Major | BucketCache |
| [HBASE-15665](https://issues.apache.org/jira/browse/HBASE-15665) | Support using different StoreFileComparators for different CompactionPolicies | Major | Compaction |
| [HBASE-15527](https://issues.apache.org/jira/browse/HBASE-15527) | Refactor Compactor related classes | Major | Compaction |
| [HBASE-15407](https://issues.apache.org/jira/browse/HBASE-15407) | Add SASL support for fan out OutputStream | Major | util, wal |
| [HBASE-15380](https://issues.apache.org/jira/browse/HBASE-15380) | Purge rollback support in Store etc. | Major | . |
| [HBASE-15537](https://issues.apache.org/jira/browse/HBASE-15537) | Make multi WAL work with WALs other than FSHLog | Major | . |
| [HBASE-15400](https://issues.apache.org/jira/browse/HBASE-15400) | Use DateTieredCompactor for Date Tiered Compaction | Major | Compaction |
| [HBASE-15369](https://issues.apache.org/jira/browse/HBASE-15369) | Handle NPE in region.jsp | Minor | UI |
| [HBASE-15505](https://issues.apache.org/jira/browse/HBASE-15505) | ReplicationPeerConfig should be builder-style | Major | . |
| [HBASE-15293](https://issues.apache.org/jira/browse/HBASE-15293) | Handle TableNotFound and IllegalArgument exceptions in table.jsp | Major | UI |
| [HBASE-15538](https://issues.apache.org/jira/browse/HBASE-15538) | Implement secure async protobuf wal writer | Major | wal |
| [HBASE-15389](https://issues.apache.org/jira/browse/HBASE-15389) | Write out multiple files when compaction | Major | Compaction |
| [HBASE-15384](https://issues.apache.org/jira/browse/HBASE-15384) | Avoid using '/tmp' directory in TestBulkLoad | Major | test |
| [HBASE-15524](https://issues.apache.org/jira/browse/HBASE-15524) | Fix NPE in client-side metrics | Critical | Client, metrics |
| [HBASE-15495](https://issues.apache.org/jira/browse/HBASE-15495) | Connection leak in FanOutOneBlockAsyncDFSOutputHelper | Major | . |
| [HBASE-15416](https://issues.apache.org/jira/browse/HBASE-15416) | TestHFileBackedByBucketCache is flakey since it went in | Critical | BucketCache |
| [HBASE-15412](https://issues.apache.org/jira/browse/HBASE-15412) | Add average region size metric | Major | . |
| [HBASE-15488](https://issues.apache.org/jira/browse/HBASE-15488) | Add ACL for setting split merge switch | Major | . |
| [HBASE-15464](https://issues.apache.org/jira/browse/HBASE-15464) | Flush / Compaction metrics revisited | Major | metrics |
| [HBASE-15460](https://issues.apache.org/jira/browse/HBASE-15460) | Fix infer issues in hbase-common | Major | . |
| [HBASE-15479](https://issues.apache.org/jira/browse/HBASE-15479) | No more garbage or beware of autoboxing | Major | Client |
| [HBASE-15334](https://issues.apache.org/jira/browse/HBASE-15334) | Add avro support for spark hbase connector | Major | . |
| [HBASE-15390](https://issues.apache.org/jira/browse/HBASE-15390) | Unnecessary MetaCache evictions cause elevated number of requests to meta | Blocker | Client |
| [HBASE-15180](https://issues.apache.org/jira/browse/HBASE-15180) | Reduce garbage created while reading Cells from Codec Decoder | Major | regionserver |
| [HBASE-15435](https://issues.apache.org/jira/browse/HBASE-15435) | Add WAL (in bytes) written metric | Major | . |
| [HBASE-15113](https://issues.apache.org/jira/browse/HBASE-15113) | Procedure v2 - Speedup eviction of sys operation results | Minor | proc-v2 |
| [HBASE-15422](https://issues.apache.org/jira/browse/HBASE-15422) | Procedure v2 - Avoid double yield | Major | proc-v2 |
| [HBASE-15421](https://issues.apache.org/jira/browse/HBASE-15421) | Convert TestStoreScanner to junit4 from junit3 and clean up close of scanners | Minor | test |
| [HBASE-15354](https://issues.apache.org/jira/browse/HBASE-15354) | Use same criteria for clearing meta cache for all operations | Major | Client |
| [HBASE-15373](https://issues.apache.org/jira/browse/HBASE-15373) | DEPRECATED\_NAME\_OF\_NO\_LIMIT\_THROUGHPUT\_CONTROLLER\_CLASS value is wrong in CompactionThroughputControllerFactory | Minor | Compaction |
| [HBASE-15375](https://issues.apache.org/jira/browse/HBASE-15375) | Do not write to '/tmp' in TestRegionMover | Major | test |
| [HBASE-15359](https://issues.apache.org/jira/browse/HBASE-15359) | Simplifying Segment hierarchy | Major | . |
| [HBASE-15371](https://issues.apache.org/jira/browse/HBASE-15371) | Procedure V2 - Completed support parent-child procedure | Major | proc-v2 |
| [HBASE-15365](https://issues.apache.org/jira/browse/HBASE-15365) | Do not write to '/tmp' in TestHBaseConfiguration | Major | test |
| [HBASE-15346](https://issues.apache.org/jira/browse/HBASE-15346) | add 1.3 RM to docs | Major | documentation |
| [HBASE-15351](https://issues.apache.org/jira/browse/HBASE-15351) | Fix description of hbase.bucketcache.size in hbase-default.xml | Major | documentation |
| [HBASE-15205](https://issues.apache.org/jira/browse/HBASE-15205) | Do not find the replication scope for every WAL#append() | Minor | regionserver |
| [HBASE-15311](https://issues.apache.org/jira/browse/HBASE-15311) | Prevent NPE in BlockCacheViewTmpl | Major | UI |
| [HBASE-15144](https://issues.apache.org/jira/browse/HBASE-15144) | Procedure v2 - Web UI displaying Store state | Minor | proc-v2, UI |
| [HBASE-15264](https://issues.apache.org/jira/browse/HBASE-15264) | Implement a fan out HDFS OutputStream | Major | util, wal |
| [HBASE-15016](https://issues.apache.org/jira/browse/HBASE-15016) | StoreServices facility in Region | Major | . |
| [HBASE-15232](https://issues.apache.org/jira/browse/HBASE-15232) | Exceptions returned over multi RPC don't automatically trigger region location reloads | Major | Client |
| [HBASE-14949](https://issues.apache.org/jira/browse/HBASE-14949) | Resolve name conflict when splitting if there are duplicated WAL entries | Major | wal |
| [HBASE-15270](https://issues.apache.org/jira/browse/HBASE-15270) | Use appropriate encoding for "filter" field in TaskMonitorTmpl.jamon | Major | UI |
| [HBASE-15263](https://issues.apache.org/jira/browse/HBASE-15263) | TestIPv6NIOServerSocketChannel.testServerSocketFromLocalhostResolution can hang indefinetly | Major | . |
| [HBASE-15244](https://issues.apache.org/jira/browse/HBASE-15244) | More doc around native lib setup and check and crc | Major | documentation, Performance |
| [HBASE-15203](https://issues.apache.org/jira/browse/HBASE-15203) | Reduce garbage created by path.toString() during Checksum verification | Minor | regionserver |
| [HBASE-14919](https://issues.apache.org/jira/browse/HBASE-14919) | Infrastructure refactoring for In-Memory Flush | Major | . |
| [HBASE-15204](https://issues.apache.org/jira/browse/HBASE-15204) | Try to estimate the cell count for adding into WALEdit | Major | regionserver |
| [HBASE-15239](https://issues.apache.org/jira/browse/HBASE-15239) | Remove unused LoadBalancer.immediateAssignment() | Trivial | Balancer |
| [HBASE-15238](https://issues.apache.org/jira/browse/HBASE-15238) | HFileReaderV2 prefetch overreaches; runs off the end of the data | Major | . |
| [HBASE-15046](https://issues.apache.org/jira/browse/HBASE-15046) | Perf test doing all mutation steps under row lock | Major | Performance |
| [HBASE-15158](https://issues.apache.org/jira/browse/HBASE-15158) | Change order in which we do write pipeline operations; do all under row locks! | Major | Performance |
| [HBASE-15163](https://issues.apache.org/jira/browse/HBASE-15163) | Add sampling code and metrics for get/scan/multi/mutate count separately | Major | . |
| [HBASE-15157](https://issues.apache.org/jira/browse/HBASE-15157) | Add \*PerformanceTest for Append, CheckAnd\* | Major | Performance, test |
| [HBASE-15094](https://issues.apache.org/jira/browse/HBASE-15094) | Selection of WAL files eligible for incremental backup is broken | Major | . |
| [HBASE-15210](https://issues.apache.org/jira/browse/HBASE-15210) | Undo aggressive load balancer logging at tens of lines per millisecond | Major | Balancer |
| [HBASE-15202](https://issues.apache.org/jira/browse/HBASE-15202) | Reduce garbage while setting response | Minor | regionserver |
| [HBASE-15194](https://issues.apache.org/jira/browse/HBASE-15194) | TestStochasticLoadBalancer.testRegionReplicationOnMidClusterSameHosts flaky on trunk | Major | flakey, test |
| [HBASE-14841](https://issues.apache.org/jira/browse/HBASE-14841) | Allow Dictionary to work with BytebufferedCells | Major | regionserver, Scanners |
| [HBASE-15142](https://issues.apache.org/jira/browse/HBASE-15142) | Procedure v2 - Basic WebUI listing the procedures | Minor | proc-v2, UI |
| [HBASE-15171](https://issues.apache.org/jira/browse/HBASE-15171) | Avoid counting duplicate kv and generating lots of small hfiles in PutSortReducer | Major | . |
| [HBASE-15106](https://issues.apache.org/jira/browse/HBASE-15106) | Procedure V2 - Procedure Queue pass Procedure for better debuggability | Major | proc-v2 |
| [HBASE-14221](https://issues.apache.org/jira/browse/HBASE-14221) | Reduce the number of time row comparison is done in a Scan | Major | Scanners |
| [HBASE-15118](https://issues.apache.org/jira/browse/HBASE-15118) | Fix findbugs complaint in hbase-server | Major | build |
| [HBASE-15115](https://issues.apache.org/jira/browse/HBASE-15115) | Fix findbugs complaints in hbase-client | Major | build |
| [HBASE-14962](https://issues.apache.org/jira/browse/HBASE-14962) | TestSplitWalDataLoss fails on all branches | Blocker | test |
| [HBASE-15114](https://issues.apache.org/jira/browse/HBASE-15114) | NPE when IPC server ByteBuffer reservoir is turned off | Major | . |
| [HBASE-15105](https://issues.apache.org/jira/browse/HBASE-15105) | Procedure V2 - Procedure Queue with Namespaces | Major | proc-v2 |
| [HBASE-14837](https://issues.apache.org/jira/browse/HBASE-14837) | Procedure V2 - Procedure Queue Improvement | Minor | proc-v2 |
| [HBASE-15095](https://issues.apache.org/jira/browse/HBASE-15095) | isReturnResult=false on fast path in branch-1.1 and branch-1.0 is not respected | Major | Performance |
| [HBASE-15087](https://issues.apache.org/jira/browse/HBASE-15087) | Fix hbase-common findbugs complaints | Major | build |
| [HBASE-15077](https://issues.apache.org/jira/browse/HBASE-15077) | Support OffheapKV write in compaction with out copying data on heap | Major | regionserver, Scanners |
| [HBASE-12593](https://issues.apache.org/jira/browse/HBASE-12593) | Tags to work with ByteBuffer | Major | regionserver, Scanners |
| [HBASE-14488](https://issues.apache.org/jira/browse/HBASE-14488) | Procedure V2 - shell command to abort a procedure | Major | proc-v2 |
| [HBASE-14487](https://issues.apache.org/jira/browse/HBASE-14487) | Procedure V2 - shell command to list all procedures | Major | proc-v2, shell |
| [HBASE-14108](https://issues.apache.org/jira/browse/HBASE-14108) | Procedure V2 - Administrative Task: provide an API to abort a procedure | Major | proc-v2 |
| [HBASE-14432](https://issues.apache.org/jira/browse/HBASE-14432) | Procedure V2 - enforce ACL on procedure admin tasks | Major | proc-v2 |
| [HBASE-14107](https://issues.apache.org/jira/browse/HBASE-14107) | Procedure V2 - Administrative Task: Provide an API to List all procedures | Major | proc-v2 |
| [HBASE-15023](https://issues.apache.org/jira/browse/HBASE-15023) | Reenable TestShell and TestStochasticLoadBalancer | Major | test |
| [HBASE-14908](https://issues.apache.org/jira/browse/HBASE-14908) | TestRowCounter flakey especially on branch-1 | Major | flakey, test |
| [HBASE-14863](https://issues.apache.org/jira/browse/HBASE-14863) | Add missing test/resources/log4j files in hbase modules | Trivial | test |
| [HBASE-14947](https://issues.apache.org/jira/browse/HBASE-14947) | Procedure V2 - WALProcedureStore improvements | Blocker | proc-v2 |
| [HBASE-14895](https://issues.apache.org/jira/browse/HBASE-14895) | Seek only to the newly flushed file on scanner reset on flush | Major | . |
| [HBASE-14655](https://issues.apache.org/jira/browse/HBASE-14655) | Narrow the scope of doAs() calls to region observer notifications for compaction | Blocker | Coprocessors, security |
| [HBASE-14631](https://issues.apache.org/jira/browse/HBASE-14631) | Region merge request should be audited with request user through proper scope of doAs() calls to region observer notifications | Blocker | Coprocessors, security |
| [HBASE-14605](https://issues.apache.org/jira/browse/HBASE-14605) | Split fails due to 'No valid credentials' error when SecureBulkLoadEndpoint#start tries to access hdfs | Blocker | Coprocessors, security |
| [HBASE-14772](https://issues.apache.org/jira/browse/HBASE-14772) | Improve zombie detector; be more discerning | Major | test |
| [HBASE-14884](https://issues.apache.org/jira/browse/HBASE-14884) | TestSplitTransactionOnCluster.testSSHCleanupDaugtherRegionsOfAbortedSplit is flakey | Major | flakey, test |
| [HBASE-14909](https://issues.apache.org/jira/browse/HBASE-14909) | NPE testing for RIT | Major | test |
| [HBASE-14575](https://issues.apache.org/jira/browse/HBASE-14575) | Relax region read lock for compactions | Major | Compaction, regionserver |
| [HBASE-14819](https://issues.apache.org/jira/browse/HBASE-14819) | hbase-it tests failing with OOME; permgen | Major | test |
| [HBASE-14832](https://issues.apache.org/jira/browse/HBASE-14832) | Ensure write paths work with ByteBufferedCells in case of compaction | Minor | regionserver, Scanners |
| [HBASE-14798](https://issues.apache.org/jira/browse/HBASE-14798) | NPE reporting server load causes regionserver abort; causes TestAcidGuarantee to fail | Major | test |
| [HBASE-14794](https://issues.apache.org/jira/browse/HBASE-14794) | Cleanup TestAtomicOperation, TestImportExport, and TestMetaWithReplicas | Major | flakey, test |
| [HBASE-14785](https://issues.apache.org/jira/browse/HBASE-14785) | Hamburger menu for mobile site | Major | website |
| [HBASE-14786](https://issues.apache.org/jira/browse/HBASE-14786) | TestProcedureAdmin hangs | Major | hangingTests, test |
| [HBASE-14589](https://issues.apache.org/jira/browse/HBASE-14589) | Looking for the surefire-killer; builds being killed...ExecutionException: java.lang.RuntimeException: The forked VM terminated without properly saying goodbye. VM crash or System.exit called? | Major | test |
| [HBASE-14725](https://issues.apache.org/jira/browse/HBASE-14725) | Vet categorization of tests so they for sure go into the right small/medium/large buckets | Major | test |
| [HBASE-14638](https://issues.apache.org/jira/browse/HBASE-14638) | Move Jython info from the Wiki to the Ref Guide | Major | documentation |
| [HBASE-14639](https://issues.apache.org/jira/browse/HBASE-14639) | Move Scala info from Wiki to Ref Guide | Major | documentation |
| [HBASE-13478](https://issues.apache.org/jira/browse/HBASE-13478) | Document the change of default master ports being used . | Minor | documentation |
| [HBASE-14641](https://issues.apache.org/jira/browse/HBASE-14641) | Move JDO example from Wiki to Ref Guide | Major | documentation |
| [HBASE-14640](https://issues.apache.org/jira/browse/HBASE-14640) | Move Cascading info from Wiki to Ref Guide | Major | documentation |
| [HBASE-14720](https://issues.apache.org/jira/browse/HBASE-14720) | Make TestHCM and TestMetaWithReplicas large tests rather than mediums | Major | hangingTests, test |
| [HBASE-14710](https://issues.apache.org/jira/browse/HBASE-14710) | Add category-based timeouts to MR tests | Major | hangingTests, mapreduce, test |
| [HBASE-14709](https://issues.apache.org/jira/browse/HBASE-14709) | Parent change breaks graceful\_stop.sh on a cluster | Major | Operability |
| [HBASE-14702](https://issues.apache.org/jira/browse/HBASE-14702) | TestZKProcedureControllers.testZKCoordinatorControllerWithSingleMemberCohort is a flakey | Major | flakey, test |
| [HBASE-14698](https://issues.apache.org/jira/browse/HBASE-14698) | Set category timeouts on TestScanner and TestNamespaceAuditor | Major | test |
| [HBASE-14648](https://issues.apache.org/jira/browse/HBASE-14648) | Reenable TestWALProcedureStoreOnHDFS#testWalRollOnLowReplication | Critical | test |
| [HBASE-14685](https://issues.apache.org/jira/browse/HBASE-14685) | Procedure Id is not set for MasterRpcServices#modifyTable | Major | master, proc-v2 |
| [HBASE-14535](https://issues.apache.org/jira/browse/HBASE-14535) | Integration test for rpc connection concurrency / deadlock testing | Major | IPC/RPC |
| [HBASE-14657](https://issues.apache.org/jira/browse/HBASE-14657) | Remove unneeded API from EncodedSeeker | Major | io |
| [HBASE-13538](https://issues.apache.org/jira/browse/HBASE-13538) | Procedure v2 - client add/delete/modify column family sync (incompatible with branch-1.x) | Major | proc-v2 |
| [HBASE-14662](https://issues.apache.org/jira/browse/HBASE-14662) | Fix NPE in HFileOutputFormat2 | Major | . |
| [HBASE-14636](https://issues.apache.org/jira/browse/HBASE-14636) | Clear HFileScannerImpl#prevBlocks in between Compaction flow | Blocker | regionserver, Scanners |
| [HBASE-14595](https://issues.apache.org/jira/browse/HBASE-14595) | For Wiki contents that are also in the Ref Guide, replace content with a URL | Major | documentation |
| [HBASE-14646](https://issues.apache.org/jira/browse/HBASE-14646) | Move TestCellACLs from medium to large category | Minor | test |
| [HBASE-14647](https://issues.apache.org/jira/browse/HBASE-14647) | Disable TestWALProcedureStoreOnHDFS#testWalRollOnLowReplication | Major | test |
| [HBASE-14637](https://issues.apache.org/jira/browse/HBASE-14637) | Loosen TestChoreService assert AND have TestDataBlockEncoders do less work (and add timeouts) | Major | test |
| [HBASE-14627](https://issues.apache.org/jira/browse/HBASE-14627) | Move Stargate docs to Ref Guide | Major | documentation |
| [HBASE-14607](https://issues.apache.org/jira/browse/HBASE-14607) | Convert SupportingProjects wiki page to a site page | Major | documentation |
| [HBASE-14570](https://issues.apache.org/jira/browse/HBASE-14570) | Split TestHBaseFsck in order to help with hanging tests | Major | test |
| [HBASE-14602](https://issues.apache.org/jira/browse/HBASE-14602) | Convert HBasePoweredBy Wiki page to a hbase.apache.org page | Major | documentation |
| [HBASE-14596](https://issues.apache.org/jira/browse/HBASE-14596) | TestCellACLs failing... on1.2 builds | Major | test |
| [HBASE-14600](https://issues.apache.org/jira/browse/HBASE-14600) | Make #testWalRollOnLowReplication looser still | Major | test |
| [HBASE-13819](https://issues.apache.org/jira/browse/HBASE-13819) | Make RPC layer CellBlock buffer a DirectByteBuffer | Major | Scanners |
| [HBASE-14558](https://issues.apache.org/jira/browse/HBASE-14558) | Document ChaosMonkey enhancements from HBASE-14261 | Major | documentation |
| [HBASE-14590](https://issues.apache.org/jira/browse/HBASE-14590) | Shorten ByteBufferedCell#getXXXPositionInByteBuffer method name | Major | regionserver, Scanners |
| [HBASE-14585](https://issues.apache.org/jira/browse/HBASE-14585) | Clean up TestSnapshotCloneIndependence | Major | flakey, test |
| [HBASE-14567](https://issues.apache.org/jira/browse/HBASE-14567) | Tuneup hanging test TestMobCompactor and TestMobSweeper | Major | test |
| [HBASE-14572](https://issues.apache.org/jira/browse/HBASE-14572) | TestImportExport#testImport94Table can't find its src data file | Major | test |
| [HBASE-14571](https://issues.apache.org/jira/browse/HBASE-14571) | Purge TestProcessBasedCluster; it does nothing and then fails | Major | test |
| [HBASE-14519](https://issues.apache.org/jira/browse/HBASE-14519) | Purge TestFavoredNodeAssignmentHelper, a test for an abandoned feature that can hang | Major | test |
| [HBASE-14563](https://issues.apache.org/jira/browse/HBASE-14563) | Disable zombie TestHFileOutputFormat2 | Major | test |
| [HBASE-14561](https://issues.apache.org/jira/browse/HBASE-14561) | Disable zombie TestReplicationShell | Major | test |
| [HBASE-14559](https://issues.apache.org/jira/browse/HBASE-14559) | branch-1 test tweeks; disable assert explicit region lands post-restart and up a few handlers | Major | test |
| [HBASE-14480](https://issues.apache.org/jira/browse/HBASE-14480) | Small optimization in SingleByteBuff | Major | regionserver, Scanners |
| [HBASE-14539](https://issues.apache.org/jira/browse/HBASE-14539) | Slight improvement of StoreScanner.optimize | Minor | Performance, Scanners |
| [HBASE-14543](https://issues.apache.org/jira/browse/HBASE-14543) | Have findHangingTests.py dump more info | Major | tooling |
| [HBASE-14513](https://issues.apache.org/jira/browse/HBASE-14513) | TestBucketCache runs obnoxious 1k threads in a unit test | Major | test |
| [HBASE-14495](https://issues.apache.org/jira/browse/HBASE-14495) | TestHRegion#testFlushCacheWhileScanning goes zombie | Major | test |
| [HBASE-14507](https://issues.apache.org/jira/browse/HBASE-14507) | Disable TestDistributedLogSplitting#testWorkerAbort Its flakey with tenuous chance of success | Major | test |
| [HBASE-14398](https://issues.apache.org/jira/browse/HBASE-14398) | Create the fake keys required in the scan path to avoid copy to byte[] | Major | . |
| [HBASE-14430](https://issues.apache.org/jira/browse/HBASE-14430) | TestHttpServerLifecycle#testStartedServerIsAlive times out | Major | test |
| [HBASE-14212](https://issues.apache.org/jira/browse/HBASE-14212) | Add IT test for procedure-v2-based namespace DDL | Major | proc-v2 |
| [HBASE-14051](https://issues.apache.org/jira/browse/HBASE-14051) | Undo workarounds in IntegrationTestDDLMasterFailover for client double submit | Major | master |
| [HBASE-12748](https://issues.apache.org/jira/browse/HBASE-12748) | RegionCoprocessorHost.execOperation creates too many iterator objects | Major | . |
| [HBASE-14378](https://issues.apache.org/jira/browse/HBASE-14378) | Get TestAccessController\* passing again on branch-1 | Major | . |
| [HBASE-14484](https://issues.apache.org/jira/browse/HBASE-14484) | Follow-on from HBASE-14421, just disable TestFastFail\* until someone digs in and fixes it | Major | test |
| [HBASE-14464](https://issues.apache.org/jira/browse/HBASE-14464) | Removed unused fs code | Minor | regionserver |
| [HBASE-14472](https://issues.apache.org/jira/browse/HBASE-14472) | TestHCM and TestRegionServerNoMaster fixes | Minor | test |
| [HBASE-14147](https://issues.apache.org/jira/browse/HBASE-14147) | REST Support for Namespaces | Minor | REST |
| [HBASE-14447](https://issues.apache.org/jira/browse/HBASE-14447) | Spark tests failing: bind exception when putting up info server | Minor | test |
| [HBASE-14278](https://issues.apache.org/jira/browse/HBASE-14278) | Fix NPE that is showing up since HBASE-14274 went in | Major | test |
| [HBASE-14433](https://issues.apache.org/jira/browse/HBASE-14433) | Set down the client executor core thread count from 256 in tests | Major | test |
| [HBASE-14401](https://issues.apache.org/jira/browse/HBASE-14401) | Stamp failed appends with sequenceid too.... Cleans up latches | Major | test, wal |
| [HBASE-14435](https://issues.apache.org/jira/browse/HBASE-14435) | thrift tests don't have test-specific hbase-site.xml so 'BindException: Address already in use' because info port is not turned off | Major | test |
| [HBASE-14428](https://issues.apache.org/jira/browse/HBASE-14428) | Upgrade our surefire-plugin from 2.18 to 2.18.1 | Major | test |
| [HBASE-14421](https://issues.apache.org/jira/browse/HBASE-14421) | TestFastFail\* are flakey | Major | test |
| [HBASE-14423](https://issues.apache.org/jira/browse/HBASE-14423) | TestStochasticBalancerJmxMetrics.testJmxMetrics\_PerTableMode:183 NullPointer | Major | test |
| [HBASE-14395](https://issues.apache.org/jira/browse/HBASE-14395) | Short circuit last byte check in CellUtil#matchingXXX methods for ByteBufferedCells | Major | regionserver, Scanners |
| [HBASE-14368](https://issues.apache.org/jira/browse/HBASE-14368) | New TestWALLockup broken by addendum added to parent issue | Major | test |
| [HBASE-14322](https://issues.apache.org/jira/browse/HBASE-14322) | Master still not using more than it's priority threads | Major | IPC/RPC, master |
| [HBASE-13212](https://issues.apache.org/jira/browse/HBASE-13212) | Procedure V2 - master Create/Modify/Delete namespace | Major | master |
| [HBASE-14239](https://issues.apache.org/jira/browse/HBASE-14239) | Branch-1.2 AM can get stuck when meta moves | Major | Region Assignment |
| [HBASE-14274](https://issues.apache.org/jira/browse/HBASE-14274) | Deadlock in region metrics on shutdown: MetricsRegionSourceImpl vs MetricsRegionAggregateSourceImpl | Major | test |
| [HBASE-14186](https://issues.apache.org/jira/browse/HBASE-14186) | Read mvcc vlong optimization | Major | Performance, Scanners |
| [HBASE-14144](https://issues.apache.org/jira/browse/HBASE-14144) | Bloomfilter path to work with Byte buffered cells | Major | regionserver, Scanners |
| [HBASE-14087](https://issues.apache.org/jira/browse/HBASE-14087) | ensure correct ASF policy compliant headers on source/docs | Blocker | build |
| [HBASE-14202](https://issues.apache.org/jira/browse/HBASE-14202) | Reduce garbage we create | Major | regionserver, Scanners |
| [HBASE-14105](https://issues.apache.org/jira/browse/HBASE-14105) | Add shell tests for Snapshot | Major | test |
| [HBASE-14188](https://issues.apache.org/jira/browse/HBASE-14188) | Read path optimizations after HBASE-11425 profiling | Major | Scanners |
| [HBASE-14176](https://issues.apache.org/jira/browse/HBASE-14176) | Add missing headers to META-INF files | Trivial | build |
| [HBASE-14086](https://issues.apache.org/jira/browse/HBASE-14086) | remove unused bundled dependencies | Blocker | documentation |
| [HBASE-14063](https://issues.apache.org/jira/browse/HBASE-14063) | Use BufferBackedCell in read path after HBASE-12213 and HBASE-12295 | Major | regionserver, Scanners |
| [HBASE-12295](https://issues.apache.org/jira/browse/HBASE-12295) | Prevent block eviction under us if reads are in progress from the BBs | Major | regionserver, Scanners |
| [HBASE-14116](https://issues.apache.org/jira/browse/HBASE-14116) | Change ByteBuff.getXXXStrictlyForward to relative position based reads | Major | . |
| [HBASE-12374](https://issues.apache.org/jira/browse/HBASE-12374) | Change DBEs to work with new BB based cell | Major | regionserver, Scanners |
| [HBASE-14120](https://issues.apache.org/jira/browse/HBASE-14120) | ByteBufferUtils#compareTo small optimization | Major | regionserver, Scanners |
| [HBASE-14104](https://issues.apache.org/jira/browse/HBASE-14104) | Add vectorportal.com to NOTICES.txt as src of our logo | Major | documentation |
| [HBASE-14102](https://issues.apache.org/jira/browse/HBASE-14102) | Add thank you to our thanks page for vectorportal.com | Major | . |
| [HBASE-12015](https://issues.apache.org/jira/browse/HBASE-12015) | Not cleaning Mob data when Mob CF is removed from table | Major | . |
| [HBASE-13993](https://issues.apache.org/jira/browse/HBASE-13993) | WALProcedureStore fencing is not effective if new WAL rolls | Major | master |
| [HBASE-13387](https://issues.apache.org/jira/browse/HBASE-13387) | Add ByteBufferedCell an extension to Cell | Major | regionserver, Scanners |
| [HBASE-13832](https://issues.apache.org/jira/browse/HBASE-13832) | Procedure V2: master fail to start due to WALProcedureStore sync failures when HDFS data nodes count is low | Blocker | master, proc-v2 |
| [HBASE-13415](https://issues.apache.org/jira/browse/HBASE-13415) | Procedure V2 - Use nonces for double submits from client | Blocker | master |
| [HBASE-14017](https://issues.apache.org/jira/browse/HBASE-14017) | Procedure v2 - MasterProcedureQueue fix concurrency issue on table queue deletion | Blocker | proc-v2 |
| [HBASE-14020](https://issues.apache.org/jira/browse/HBASE-14020) | Unsafe based optimized write in ByteBufferOutputStream | Major | Scanners |
| [HBASE-13998](https://issues.apache.org/jira/browse/HBASE-13998) | Remove CellComparator#compareRows(byte[] left, int loffset, int llength, byte[] right, int roffset, int rlength) | Major | . |
| [HBASE-13977](https://issues.apache.org/jira/browse/HBASE-13977) | Convert getKey and related APIs to Cell | Major | . |
| [HBASE-14013](https://issues.apache.org/jira/browse/HBASE-14013) | Retry when RegionServerNotYetRunningException rather than go ahead with assign so for sure we don't skip WAL replay | Major | Region Assignment |
| [HBASE-13975](https://issues.apache.org/jira/browse/HBASE-13975) | add 1.2 RM to docs | Major | documentation |
| [HBASE-13911](https://issues.apache.org/jira/browse/HBASE-13911) | add 1.2 to prereq tables in ref guide | Blocker | documentation |
| [HBASE-13990](https://issues.apache.org/jira/browse/HBASE-13990) | clean up remaining errors for maven site goal | Major | documentation |
| [HBASE-14003](https://issues.apache.org/jira/browse/HBASE-14003) | work around jdk8 spec bug in WALPerfEval | Critical | test |
| [HBASE-13939](https://issues.apache.org/jira/browse/HBASE-13939) | Make HFileReaderImpl.getFirstKeyInBlock() to return a Cell | Minor | . |
| [HBASE-13614](https://issues.apache.org/jira/browse/HBASE-13614) | Avoid temp KeyOnlyKeyValue temp objects creations in read hot path | Critical | . |
| [HBASE-12345](https://issues.apache.org/jira/browse/HBASE-12345) | Unsafe based ByteBuffer Comparator | Major | regionserver, Scanners |
| [HBASE-13922](https://issues.apache.org/jira/browse/HBASE-13922) | Do not reset mvcc in compactions for mob-enabled column | Major | mob |
| [HBASE-13968](https://issues.apache.org/jira/browse/HBASE-13968) | Remove deprecated methods from BufferedMutator class | Major | API |
| [HBASE-13973](https://issues.apache.org/jira/browse/HBASE-13973) | Update documentation for 10070 Phase 2 changes | Major | . |
| [HBASE-13967](https://issues.apache.org/jira/browse/HBASE-13967) | add jdk profiles for jdk.tools dependency | Major | . |
| [HBASE-13950](https://issues.apache.org/jira/browse/HBASE-13950) | Add a NoopProcedureStore for testing | Trivial | proc-v2 |
| [HBASE-13920](https://issues.apache.org/jira/browse/HBASE-13920) | Exclude Java files generated from protobuf from javadoc | Minor | . |
| [HBASE-13932](https://issues.apache.org/jira/browse/HBASE-13932) | Add mob integrity check in HFilePrettyPrinter | Major | mob |
| [HBASE-13898](https://issues.apache.org/jira/browse/HBASE-13898) | correct additional javadoc failures under java 8 | Minor | documentation |
| [HBASE-13728](https://issues.apache.org/jira/browse/HBASE-13728) | Remove use of Hadoop's GenericOptionsParser | Blocker | . |
| [HBASE-13448](https://issues.apache.org/jira/browse/HBASE-13448) | New Cell implementation with cached component offsets/lengths | Blocker | Scanners |
| [HBASE-13926](https://issues.apache.org/jira/browse/HBASE-13926) | Close the scanner only after Call#setResponse | Major | regionserver, Scanners |
| [HBASE-13916](https://issues.apache.org/jira/browse/HBASE-13916) | Create MultiByteBuffer an aggregation of ByteBuffers | Major | regionserver, Scanners |
| [HBASE-13470](https://issues.apache.org/jira/browse/HBASE-13470) | High level Integration test for master DDL operations | Major | master |
| [HBASE-13886](https://issues.apache.org/jira/browse/HBASE-13886) | Return empty value when the mob file is corrupt instead of throwing exceptions | Major | mob |
| [HBASE-13910](https://issues.apache.org/jira/browse/HBASE-13910) | add branch-1.2 to precommit branches | Major | build |
| [HBASE-13899](https://issues.apache.org/jira/browse/HBASE-13899) | Jacoco instrumentation fails under jdk8 | Major | build, test |
| [HBASE-13569](https://issues.apache.org/jira/browse/HBASE-13569) | correct errors reported with mvn site | Minor | documentation |
| [HBASE-13855](https://issues.apache.org/jira/browse/HBASE-13855) | Race in multi threaded PartitionedMobCompactor causes NPE | Critical | mob |
| [HBASE-13871](https://issues.apache.org/jira/browse/HBASE-13871) | Change RegionScannerImpl to deal with Cell instead of byte[], int, int | Major | regionserver, Scanners |
| [HBASE-13836](https://issues.apache.org/jira/browse/HBASE-13836) | Do not reset the mvcc for bulk loaded mob reference cells in reading | Major | mob |
| [HBASE-13451](https://issues.apache.org/jira/browse/HBASE-13451) | Make the HFileBlockIndex blockKeys to Cells so that it could be easy to use in the CellComparators | Major | . |
| [HBASE-13856](https://issues.apache.org/jira/browse/HBASE-13856) | Wrong mob metrics names in TestRegionServerMetrics | Major | mob |
| [HBASE-13806](https://issues.apache.org/jira/browse/HBASE-13806) | Check the mob files when there are mob-enabled columns in HFileCorruptionChecker | Major | mob |
| [HBASE-13827](https://issues.apache.org/jira/browse/HBASE-13827) | Delayed scanner close in KeyValueHeap and StoreScanner | Major | regionserver, Scanners |
| [HBASE-13817](https://issues.apache.org/jira/browse/HBASE-13817) | ByteBufferOuputStream - add writeInt support | Major | Scanners |
| [HBASE-13804](https://issues.apache.org/jira/browse/HBASE-13804) | Revert the changes in pom.xml | Major | mob |
| [HBASE-13803](https://issues.apache.org/jira/browse/HBASE-13803) | Disable the MobCompactionChore when the interval is not larger than 0 | Major | mob |
| [HBASE-13805](https://issues.apache.org/jira/browse/HBASE-13805) | Use LimitInputStream in hbase-common instead of ProtobufUtil.LimitedInputStream | Major | mob |
| [HBASE-13759](https://issues.apache.org/jira/browse/HBASE-13759) | Improve procedure yielding | Trivial | proc-v2 |
| [HBASE-13790](https://issues.apache.org/jira/browse/HBASE-13790) | Remove the DeleteTableHandler | Major | mob |
| [HBASE-13616](https://issues.apache.org/jira/browse/HBASE-13616) | Move ServerShutdownHandler to Pv2 | Major | proc-v2 |
| [HBASE-13476](https://issues.apache.org/jira/browse/HBASE-13476) | Procedure V2 - Add Replay Order logic for child procedures | Major | proc-v2 |
| [HBASE-13763](https://issues.apache.org/jira/browse/HBASE-13763) | Handle the rename, annotation and typo stuff in MOB | Major | mob |
| [HBASE-13754](https://issues.apache.org/jira/browse/HBASE-13754) | Allow non KeyValue Cell types also to oswrite | Major | Scanners |
| [HBASE-13393](https://issues.apache.org/jira/browse/HBASE-13393) | Optimize memstore flushing to avoid writing tag information to hfiles when no tags are present. | Major | HFile, Performance |
| [HBASE-13658](https://issues.apache.org/jira/browse/HBASE-13658) | Improve the test run time for TestAccessController class | Major | test |
| [HBASE-13762](https://issues.apache.org/jira/browse/HBASE-13762) | Use the same HFileContext with store files in mob files | Major | mob |
| [HBASE-13720](https://issues.apache.org/jira/browse/HBASE-13720) | Mob files are not encrypting in mob compaction and Sweeper | Major | regionserver, Scanners |
| [HBASE-13739](https://issues.apache.org/jira/browse/HBASE-13739) | Remove KeyValueUtil.ensureKeyValue(cell) from MOB code. | Major | mob |
| [HBASE-13641](https://issues.apache.org/jira/browse/HBASE-13641) | Deperecate Filter#filterRowKey(byte[] buffer, int offset, int length) in favor of filterRowKey(Cell firstRowCell) | Major | Filters, regionserver, Scanners |
| [HBASE-13736](https://issues.apache.org/jira/browse/HBASE-13736) | Add delay for the first execution of ExpiredMobFileCleanerChore and MobFileCompactorChore | Major | mob |
| [HBASE-13642](https://issues.apache.org/jira/browse/HBASE-13642) | Deprecate RegionObserver#postScannerFilterRow CP hook with byte[],int,int args in favor of taking Cell arg | Major | Coprocessors, regionserver, Scanners |
| [HBASE-13679](https://issues.apache.org/jira/browse/HBASE-13679) | Change ColumnTracker and SQM to deal with Cell instead of byte[], int, int | Major | regionserver, Scanners |
| [HBASE-13531](https://issues.apache.org/jira/browse/HBASE-13531) | Flakey failures of TestAcidGuarantees#testMobScanAtomicity | Major | regionserver, Scanners |
| [HBASE-13510](https://issues.apache.org/jira/browse/HBASE-13510) | Purge ByteBloomFilter | Major | . |
| [HBASE-13398](https://issues.apache.org/jira/browse/HBASE-13398) | Document HBase Quota | Major | documentation |
| [HBASE-13201](https://issues.apache.org/jira/browse/HBASE-13201) | Remove HTablePool from thrift-server | Major | . |
| [HBASE-13571](https://issues.apache.org/jira/browse/HBASE-13571) | Procedure v2 - client modify table sync (incompatible with branch-1.x) | Minor | proc-v2 |
| [HBASE-13593](https://issues.apache.org/jira/browse/HBASE-13593) | Quota support for namespace should take snapshot restore and clone into account | Major | snapshots |
| [HBASE-13620](https://issues.apache.org/jira/browse/HBASE-13620) | Bring back the removed VisibilityClient methods and mark them as deprecated. | Minor | . |
| [HBASE-13464](https://issues.apache.org/jira/browse/HBASE-13464) | Remove deprecations for 2.0.0 - Part 1 | Major | . |
| [HBASE-13501](https://issues.apache.org/jira/browse/HBASE-13501) | Deprecate/Remove getComparator() in HRegionInfo. | Major | . |
| [HBASE-13497](https://issues.apache.org/jira/browse/HBASE-13497) | Remove MVCC stamps from HFile when that is safe | Major | Scanners |
| [HBASE-13184](https://issues.apache.org/jira/browse/HBASE-13184) | Document turning off memstore for region replicas | Critical | documentation, Replication |
| [HBASE-13537](https://issues.apache.org/jira/browse/HBASE-13537) | Procedure V2 - Change the admin interface for async operations to return Future (incompatible with branch-1.x) | Major | proc-v2 |
| [HBASE-13572](https://issues.apache.org/jira/browse/HBASE-13572) | Procedure v2 - client truncate table sync (incompatible with branch-1.x) | Minor | proc-v2 |
| [HBASE-13551](https://issues.apache.org/jira/browse/HBASE-13551) | Procedure V2 - Procedure classes should not be InterfaceAudience.Public | Blocker | master |
| [HBASE-13563](https://issues.apache.org/jira/browse/HBASE-13563) | Add missing table owner to AC tests. | Minor | . |
| [HBASE-13466](https://issues.apache.org/jira/browse/HBASE-13466) | Document deprecations in 1.x - Part 1 | Major | . |
| [HBASE-13536](https://issues.apache.org/jira/browse/HBASE-13536) | Cleanup the handlers that are no longer being used. | Major | proc-v2 |
| [HBASE-13450](https://issues.apache.org/jira/browse/HBASE-13450) | Purge RawBytescomparator from the writers and readers for HBASE-10800 | Major | . |
| [HBASE-13529](https://issues.apache.org/jira/browse/HBASE-13529) | Procedure v2 - WAL Improvements | Blocker | proc-v2 |
| [HBASE-13496](https://issues.apache.org/jira/browse/HBASE-13496) | Make Bytes$LexicographicalComparerHolder$UnsafeComparer::compareTo inlineable | Major | Scanners |
| [HBASE-13502](https://issues.apache.org/jira/browse/HBASE-13502) | Deprecate/remove getRowComparator() in TableName | Major | . |
| [HBASE-13515](https://issues.apache.org/jira/browse/HBASE-13515) | Handle FileNotFoundException in region replica replay for flush/compaction events | Major | . |
| [HBASE-13514](https://issues.apache.org/jira/browse/HBASE-13514) | Fix test failures in TestScannerHeartbeatMessages caused by incorrect setting of hbase.rpc.timeout | Minor | . |
| [HBASE-13498](https://issues.apache.org/jira/browse/HBASE-13498) | Add more docs and a basic check for storage policy handling | Minor | wal |
| [HBASE-13481](https://issues.apache.org/jira/browse/HBASE-13481) | Master should respect master (old) DNS/bind related configurations | Major | . |
| [HBASE-13307](https://issues.apache.org/jira/browse/HBASE-13307) | Making methods under ScannerV2#next inlineable, faster | Major | Scanners |
| [HBASE-13455](https://issues.apache.org/jira/browse/HBASE-13455) | Procedure V2 - master truncate table | Minor | master |
| [HBASE-13290](https://issues.apache.org/jira/browse/HBASE-13290) | Procedure v2 - client enable/disable table sync | Major | Client |
| [HBASE-13211](https://issues.apache.org/jira/browse/HBASE-13211) | Procedure V2 - master Enable/Disable table | Major | master |
| [HBASE-13210](https://issues.apache.org/jira/browse/HBASE-13210) | Procedure V2 - master Modify table | Major | master |
| [HBASE-13209](https://issues.apache.org/jira/browse/HBASE-13209) | Procedure V2 - master Add/Modify/Delete Column Family | Major | master |
| [HBASE-13204](https://issues.apache.org/jira/browse/HBASE-13204) | Procedure v2 - client create/delete table sync | Minor | master |
| [HBASE-13203](https://issues.apache.org/jira/browse/HBASE-13203) | Procedure v2 - master create/delete table | Minor | master |
| [HBASE-13202](https://issues.apache.org/jira/browse/HBASE-13202) | Procedure v2 - core framework | Major | master, proc-v2 |
| [HBASE-13447](https://issues.apache.org/jira/browse/HBASE-13447) | Bypass logic in TimeRange.compare | Minor | Scanners |
| [HBASE-13313](https://issues.apache.org/jira/browse/HBASE-13313) | Skip the disabled table in mob compaction chore and MasterRpcServices | Major | regionserver, Scanners |
| [HBASE-13429](https://issues.apache.org/jira/browse/HBASE-13429) | Remove deprecated seek/reseek methods from HFileScanner | Major | regionserver, Scanners |
| [HBASE-13421](https://issues.apache.org/jira/browse/HBASE-13421) | Reduce the number of object creations introduced by HBASE-11544 in scan RPC hot code paths | Major | . |
| [HBASE-13302](https://issues.apache.org/jira/browse/HBASE-13302) | fix new javadoc warns introduced by mob. | Major | regionserver, Scanners |
| [HBASE-13277](https://issues.apache.org/jira/browse/HBASE-13277) | add mob\_threshold option to load test tool | Major | regionserver, Scanners |
| [HBASE-13252](https://issues.apache.org/jira/browse/HBASE-13252) | Get rid of managed connections and connection caching | Major | API |
| [HBASE-13335](https://issues.apache.org/jira/browse/HBASE-13335) | Update ClientSmallScanner and ClientSmallReversedScanner | Major | Client |
| [HBASE-13213](https://issues.apache.org/jira/browse/HBASE-13213) | Split out locality metrics among primary and secondary region | Major | . |
| [HBASE-13303](https://issues.apache.org/jira/browse/HBASE-13303) | Fix size calculation of results on the region server | Major | Client |
| [HBASE-13332](https://issues.apache.org/jira/browse/HBASE-13332) | Fix the usage of doAs/runAs in Visibility Controller tests. | Major | . |
| [HBASE-13327](https://issues.apache.org/jira/browse/HBASE-13327) | Use Admin in ConnectionCache | Major | . |
| [HBASE-13258](https://issues.apache.org/jira/browse/HBASE-13258) | Promote TestHRegion to LargeTests | Major | test |
| [HBASE-13006](https://issues.apache.org/jira/browse/HBASE-13006) | Document visibility label support for groups | Minor | . |
| [HBASE-13230](https://issues.apache.org/jira/browse/HBASE-13230) | [mob] reads hang when trying to read rows with large mobs (\>10MB) | Major | mob |
| [HBASE-13244](https://issues.apache.org/jira/browse/HBASE-13244) | Test delegation token generation with kerberos enabled | Major | security, test |
| [HBASE-13226](https://issues.apache.org/jira/browse/HBASE-13226) | Document enable\_table\_replication and disable\_table\_replication shell commands | Minor | documentation |
| [HBASE-13169](https://issues.apache.org/jira/browse/HBASE-13169) | ModifyTable increasing the region replica count should also auto-setup RRRE | Major | . |
| [HBASE-13121](https://issues.apache.org/jira/browse/HBASE-13121) | Async wal replication for region replicas and dist log replay does not work together | Major | . |
| [HBASE-13095](https://issues.apache.org/jira/browse/HBASE-13095) | Document how to retrieve replication stats from HBase Shell | Major | documentation, Replication |
| [HBASE-13164](https://issues.apache.org/jira/browse/HBASE-13164) | Update TestUsersOperationsWithSecureHadoop to use MiniKdc | Major | security, test |
| [HBASE-12562](https://issues.apache.org/jira/browse/HBASE-12562) | Handling memory pressure for secondary region replicas | Major | . |
| [HBASE-13151](https://issues.apache.org/jira/browse/HBASE-13151) | IllegalArgumentException in compaction when table has a namespace | Major | regionserver, Scanners |
| [HBASE-13107](https://issues.apache.org/jira/browse/HBASE-13107) | Refactor MOB Snapshot logic to reduce code duplication. | Major | mob, snapshots |
| [HBASE-13157](https://issues.apache.org/jira/browse/HBASE-13157) | Add mob compaction actions and monkeys to Chaos Monkey | Major | integration tests, mob |
| [HBASE-12332](https://issues.apache.org/jira/browse/HBASE-12332) | [mob] improve how we resolve mobfiles in reads | Major | mob |
| [HBASE-13154](https://issues.apache.org/jira/browse/HBASE-13154) | Add support for mob in TestAcidGuarantees and IntegrationTestAcidGuarantees | Major | integration tests, mob |
| [HBASE-13012](https://issues.apache.org/jira/browse/HBASE-13012) | Add shell commands to trigger the mob file compactor | Major | regionserver, Scanners |
| [HBASE-11580](https://issues.apache.org/jira/browse/HBASE-11580) | Failover handling for secondary region replicas | Major | . |
| [HBASE-13152](https://issues.apache.org/jira/browse/HBASE-13152) | NPE in ExpiredMobFileCleanerChore | Major | regionserver, Scanners |
| [HBASE-11571](https://issues.apache.org/jira/browse/HBASE-11571) | Bulk load handling from secondary region replicas | Major | . |
| [HBASE-12670](https://issues.apache.org/jira/browse/HBASE-12670) | Add unit tests that exercise the added hfilelink link mob paths | Major | regionserver, Scanners |
| [HBASE-13130](https://issues.apache.org/jira/browse/HBASE-13130) | Add timeouts on TestMasterObserver, a frequent zombie show | Major | test |
| [HBASE-13117](https://issues.apache.org/jira/browse/HBASE-13117) | improve mob sweeper javadoc | Major | mob |
| [HBASE-13067](https://issues.apache.org/jira/browse/HBASE-13067) | Fix caching of stubs to allow IP address changes of restarted remote servers | Major | . |
| [HBASE-12561](https://issues.apache.org/jira/browse/HBASE-12561) | Replicas of regions can be cached from different instances of the table in MetaCache | Major | . |
| [HBASE-12714](https://issues.apache.org/jira/browse/HBASE-12714) | RegionReplicaReplicationEndpoint should not set the RPC Codec | Major | . |
| [HBASE-11842](https://issues.apache.org/jira/browse/HBASE-11842) | Integration test for async wal replication to secondary regions | Major | . |
| [HBASE-13013](https://issues.apache.org/jira/browse/HBASE-13013) | Add read lock to ExpiredMobFileCleanerChore | Major | master |
| [HBASE-12425](https://issues.apache.org/jira/browse/HBASE-12425) | Document the phases of the split transaction | Major | documentation |
| [HBASE-11569](https://issues.apache.org/jira/browse/HBASE-11569) | Flush / Compaction handling from secondary region replicas | Major | . |
| [HBASE-11910](https://issues.apache.org/jira/browse/HBASE-11910) | Document Premptive Call Me Maybe HBase findings in the online manual | Major | . |
| [HBASE-11567](https://issues.apache.org/jira/browse/HBASE-11567) | Write bulk load COMMIT events to WAL | Major | . |
| [HBASE-11568](https://issues.apache.org/jira/browse/HBASE-11568) | Async WAL replication for region replicas | Major | . |
| [HBASE-11861](https://issues.apache.org/jira/browse/HBASE-11861) | Native MOB Compaction mechanisms. | Major | regionserver, Scanners |
| [HBASE-10942](https://issues.apache.org/jira/browse/HBASE-10942) | support parallel request cancellation for multi-get | Major | . |
| [HBASE-12936](https://issues.apache.org/jira/browse/HBASE-12936) | Quota support for namespace should take region merge into account | Major | . |
| [HBASE-11574](https://issues.apache.org/jira/browse/HBASE-11574) | hbase:meta's regions can be replicated | Major | . |
| [HBASE-11908](https://issues.apache.org/jira/browse/HBASE-11908) | Region replicas should be added to the meta table at the time of table creation | Major | . |
| [HBASE-7847](https://issues.apache.org/jira/browse/HBASE-7847) | Use zookeeper multi to clear znodes | Major | . |
| [HBASE-12669](https://issues.apache.org/jira/browse/HBASE-12669) | Have compaction scanner save info about delete markers | Major | regionserver, Scanners |
| [HBASE-8410](https://issues.apache.org/jira/browse/HBASE-8410) | Basic quota support for namespaces | Major | . |
| [HBASE-12820](https://issues.apache.org/jira/browse/HBASE-12820) | Use table lock instead of MobZookeeper | Major | regionserver, Scanners |
| [HBASE-12848](https://issues.apache.org/jira/browse/HBASE-12848) | Utilize Flash storage for WAL | Major | . |
| [HBASE-12708](https://issues.apache.org/jira/browse/HBASE-12708) | Document newly introduced params for using Thrift-over-HTTPS. | Minor | documentation, Thrift |
| [HBASE-11533](https://issues.apache.org/jira/browse/HBASE-11533) | AsciiDoctor POC | Minor | build, documentation |
| [HBASE-12695](https://issues.apache.org/jira/browse/HBASE-12695) | JDK 1.8 compilation broken | Critical | build |
| [HBASE-12331](https://issues.apache.org/jira/browse/HBASE-12331) | Shorten the mob snapshot unit tests | Major | mob |
| [HBASE-12698](https://issues.apache.org/jira/browse/HBASE-12698) | Add mob cell count to the metadata of each mob file | Major | regionserver |
| [HBASE-12758](https://issues.apache.org/jira/browse/HBASE-12758) | treat mob region as any other region when generating rs manifest. | Major | mob, snapshots |
| [HBASE-12012](https://issues.apache.org/jira/browse/HBASE-12012) | Improve cancellation for the scan RPCs | Major | . |
| [HBASE-12738](https://issues.apache.org/jira/browse/HBASE-12738) | Chunk Ref Guide into file-per-chapter | Major | documentation |
| [HBASE-12528](https://issues.apache.org/jira/browse/HBASE-12528) | Document the newly introduced params for providing principal and keytabs. | Minor | documentation |
| [HBASE-12691](https://issues.apache.org/jira/browse/HBASE-12691) | sweep job needs to exit non-zero if job fails for any reason. | Major | mob |
| [HBASE-12648](https://issues.apache.org/jira/browse/HBASE-12648) | Document per cell TTLs | Minor | documentation |
| [HBASE-12646](https://issues.apache.org/jira/browse/HBASE-12646) | SnapshotInfo tool does not find mob data in snapshots | Major | mob, snapshots |
| [HBASE-11903](https://issues.apache.org/jira/browse/HBASE-11903) | Directly invoking split & merge of replica regions should be disallowed | Major | . |
| [HBASE-12523](https://issues.apache.org/jira/browse/HBASE-12523) | Update checkstyle plugin rules to match our use | Minor | build |
| [HBASE-12591](https://issues.apache.org/jira/browse/HBASE-12591) | Ignore the count of mob compaction metrics when there is issue | Minor | regionserver |
| [HBASE-12543](https://issues.apache.org/jira/browse/HBASE-12543) | Incorrect log info in the store compaction of mob | Minor | regionserver |
| [HBASE-12487](https://issues.apache.org/jira/browse/HBASE-12487) | Explicitly flush the file name in sweep job | Major | regionserver, Scanners |
| [HBASE-12486](https://issues.apache.org/jira/browse/HBASE-12486) | Move the mob table name tag to the 2nd one | Major | regionserver, Scanners |
| [HBASE-12489](https://issues.apache.org/jira/browse/HBASE-12489) | Incorrect 'mobFileCacheMissCount' calculated in the mob metrics | Major | regionserver, Scanners |
| [HBASE-12382](https://issues.apache.org/jira/browse/HBASE-12382) | Restore incremental compilation | Major | . |
| [HBASE-12343](https://issues.apache.org/jira/browse/HBASE-12343) | Document recommended configuration for 0.98 from HBASE-11964 | Major | . |
| [HBASE-4625](https://issues.apache.org/jira/browse/HBASE-4625) | Convert @deprecated HBaseTestCase tests JUnit4 style tests | Minor | . |
| [HBASE-12392](https://issues.apache.org/jira/browse/HBASE-12392) | Incorrect implementation of CompactionRequest.isRetainDeleteMarkers | Critical | regionserver, Scanners |
| [HBASE-12391](https://issues.apache.org/jira/browse/HBASE-12391) | Correct a typo in the mob metrics | Minor | regionserver, Scanners |
| [HBASE-11683](https://issues.apache.org/jira/browse/HBASE-11683) | Metrics for MOB | Major | regionserver, Scanners |
| [HBASE-11912](https://issues.apache.org/jira/browse/HBASE-11912) | Catch some bad practices at compile time with error-prone | Major | . |
| [HBASE-11645](https://issues.apache.org/jira/browse/HBASE-11645) | Snapshot for MOB | Major | snapshots |
| [HBASE-12093](https://issues.apache.org/jira/browse/HBASE-12093) | Support the mob attributes in hbase shell when create/alter table | Major | shell |
| [HBASE-12085](https://issues.apache.org/jira/browse/HBASE-12085) | mob status should print human readable numbers. | Major | mob, UI |
| [HBASE-12080](https://issues.apache.org/jira/browse/HBASE-12080) | Shorten the run time of integration test by default when using mvn failsafe:integration-test | Major | test |
| [HBASE-12066](https://issues.apache.org/jira/browse/HBASE-12066) | Avoid major compaction in TestMobSweeper | Major | Compaction, mob |
| [HBASE-11644](https://issues.apache.org/jira/browse/HBASE-11644) | External MOB compaction tools | Major | Compaction, master |
| [HBASE-11472](https://issues.apache.org/jira/browse/HBASE-11472) | Remove ZKTableStateClientSideReader class | Major | Client, Consensus, Zookeeper |
| [HBASE-11598](https://issues.apache.org/jira/browse/HBASE-11598) | Add simple rpc throttling | Minor | . |
| [HBASE-8139](https://issues.apache.org/jira/browse/HBASE-8139) | Allow job names to be overridden | Major | mapreduce, Usability |
| [HBASE-11646](https://issues.apache.org/jira/browse/HBASE-11646) | Handle the MOB in compaction | Major | Compaction |
| [HBASE-11986](https://issues.apache.org/jira/browse/HBASE-11986) | Document MOB in Ref Guide | Major | documentation |
| [HBASE-12000](https://issues.apache.org/jira/browse/HBASE-12000) | isMob and mobThreshold do not follow column descriptor property naming conventions | Major | regionserver, Scanners |
| [HBASE-11975](https://issues.apache.org/jira/browse/HBASE-11975) | Remove the explicit list of maven repositories in pom.xml | Major | . |
| [HBASE-7767](https://issues.apache.org/jira/browse/HBASE-7767) | Get rid of ZKTable, and table enable/disable state in ZK | Major | Zookeeper |
| [HBASE-11647](https://issues.apache.org/jira/browse/HBASE-11647) | MOB integration testing | Major | Performance, test |
| [HBASE-11911](https://issues.apache.org/jira/browse/HBASE-11911) | Break up tests into more fine grained categories | Major | . |
| [HBASE-11901](https://issues.apache.org/jira/browse/HBASE-11901) | Improve the value size of the reference cell in mob column | Major | . |
| [HBASE-11786](https://issues.apache.org/jira/browse/HBASE-11786) | Document web UI for tracking time spent in coprocessors | Minor | Coprocessors, documentation |
| [HBASE-11643](https://issues.apache.org/jira/browse/HBASE-11643) | Read and write MOB in HBase | Major | regionserver, Scanners |
| [HBASE-11779](https://issues.apache.org/jira/browse/HBASE-11779) | Document the new requirement to set JAVA\_HOME before starting HBase | Major | documentation |
| [HBASE-11607](https://issues.apache.org/jira/browse/HBASE-11607) | Document HBase metrics | Major | documentation, metrics |
| [HBASE-10674](https://issues.apache.org/jira/browse/HBASE-10674) | HBCK should be updated to do replica related checks | Major | . |
| [HBASE-4624](https://issues.apache.org/jira/browse/HBASE-4624) | Remove and convert @deprecated RemoteExceptionHandler.decodeRemoteException calls | Major | . |
| [HBASE-11261](https://issues.apache.org/jira/browse/HBASE-11261) | Handle splitting/merging of regions that have region\_replication greater than one | Major | . |
### OTHER:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-8770](https://issues.apache.org/jira/browse/HBASE-8770) | deletes and puts with the same ts should be resolved according to mvcc/seqNum | Blocker | . |
| [HBASE-20067](https://issues.apache.org/jira/browse/HBASE-20067) | Clean up findbugs warnings | Critical | . |
| [HBASE-10403](https://issues.apache.org/jira/browse/HBASE-10403) | Simplify offheap cache configuration | Minor | io |
| [HBASE-19976](https://issues.apache.org/jira/browse/HBASE-19976) | Dead lock if the worker threads in procedure executor are exhausted | Critical | . |
| [HBASE-19948](https://issues.apache.org/jira/browse/HBASE-19948) | Since HBASE-19873, HBaseClassTestRule, Small/Medium/Large has different semantic | Major | . |
| [HBASE-19296](https://issues.apache.org/jira/browse/HBASE-19296) | Fix findbugs and error-prone warnings (branch-2) | Major | . |
| [HBASE-19425](https://issues.apache.org/jira/browse/HBASE-19425) | Align the methods in Put/Delete/Increment/Append | Major | . |
| [HBASE-19627](https://issues.apache.org/jira/browse/HBASE-19627) | Stabilize the method signature for Cell and its impl | Critical | . |
| [HBASE-18429](https://issues.apache.org/jira/browse/HBASE-18429) | ITs attempt to modify immutable table/column descriptors | Critical | integration tests |
| [HBASE-18110](https://issues.apache.org/jira/browse/HBASE-18110) | [AMv2] Reenable tests temporarily disabled | Blocker | Region Assignment |
| [HBASE-18978](https://issues.apache.org/jira/browse/HBASE-18978) | Align the methods in Table and AsyncTable | Critical | asyncclient, Client |
| [HBASE-18805](https://issues.apache.org/jira/browse/HBASE-18805) | Unify Admin and AsyncAdmin | Major | . |
| [HBASE-18703](https://issues.apache.org/jira/browse/HBASE-18703) | Inconsistent behavior for preBatchMutate in doMiniBatchMutate and processRowsWithLocks | Critical | Coprocessors |
| [HBASE-18926](https://issues.apache.org/jira/browse/HBASE-18926) | Cleanup Optional\<T\> from method params | Major | . |
| [HBASE-17143](https://issues.apache.org/jira/browse/HBASE-17143) | Scan improvement | Blocker | Client, scan |
| [HBASE-18751](https://issues.apache.org/jira/browse/HBASE-18751) | Revisit the TimeRange and TimeRangeTracker | Major | . |
| [HBASE-7320](https://issues.apache.org/jira/browse/HBASE-7320) | Remove KeyValue.getBuffer() | Blocker | . |
| [HBASE-10462](https://issues.apache.org/jira/browse/HBASE-10462) | Recategorize some of the client facing Public / Private interfaces | Blocker | Client |
| [HBASE-18696](https://issues.apache.org/jira/browse/HBASE-18696) | Fix the problems when introducing the new hbase-mapreduce module | Blocker | mapreduce |
| [HBASE-18501](https://issues.apache.org/jira/browse/HBASE-18501) | Use TableDescriptor and ColumnFamilyDescriptor as far as possible | Critical | . |
| [HBASE-18266](https://issues.apache.org/jira/browse/HBASE-18266) | Eliminate the warnings from the spotbugs | Major | . |
| [HBASE-17359](https://issues.apache.org/jira/browse/HBASE-17359) | Implement async admin | Major | Client |
| [HBASE-15086](https://issues.apache.org/jira/browse/HBASE-15086) | Fix findbugs complaint so yetus reports more green | Major | build |
| [HBASE-6581](https://issues.apache.org/jira/browse/HBASE-6581) | Build with hadoop.profile=3.0 | Major | . |
| [HBASE-16617](https://issues.apache.org/jira/browse/HBASE-16617) | Procedure V2 - Improvements | Minor | master, proc-v2 |
| [HBASE-16833](https://issues.apache.org/jira/browse/HBASE-16833) | Implement asynchronous hbase client based on HBASE-15921 | Major | Client |
| [HBASE-18037](https://issues.apache.org/jira/browse/HBASE-18037) | Do not expose implementation classes to CP | Blocker | Coprocessors |
| [HBASE-15179](https://issues.apache.org/jira/browse/HBASE-15179) | Cell/DBB end-to-end on the write-path | Major | regionserver |
| [HBASE-16145](https://issues.apache.org/jira/browse/HBASE-16145) | MultiRowRangeFilter constructor shouldn't throw IOException | Minor | . |
| [HBASE-16567](https://issues.apache.org/jira/browse/HBASE-16567) | Upgrade to protobuf-3.1.x | Critical | Protobufs |
| [HBASE-11871](https://issues.apache.org/jira/browse/HBASE-11871) | Avoid usage of KeyValueUtil#ensureKeyValue | Major | regionserver |
| [HBASE-16432](https://issues.apache.org/jira/browse/HBASE-16432) | Revisit the asynchronous ipc implementation | Major | rpc |
| [HBASE-14460](https://issues.apache.org/jira/browse/HBASE-14460) | [Perf Regression] Merge of MVCC and SequenceId (HBASE-8763) slowed Increments, CheckAndPuts, batch operations | Critical | Performance |
| [HBASE-11425](https://issues.apache.org/jira/browse/HBASE-11425) | Cell/DBB end-to-end on the read-path | Major | regionserver, Scanners |
| [HBASE-14457](https://issues.apache.org/jira/browse/HBASE-14457) | Umbrella: Improve Multiple WAL for production usage | Major | . |
| [HBASE-14420](https://issues.apache.org/jira/browse/HBASE-14420) | Zombie Stomping Session | Critical | test |
| [HBASE-14869](https://issues.apache.org/jira/browse/HBASE-14869) | Better request latency and size histograms | Major | . |
| [HBASE-11339](https://issues.apache.org/jira/browse/HBASE-11339) | HBase MOB | Major | regionserver, Scanners |
| [HBASE-13747](https://issues.apache.org/jira/browse/HBASE-13747) | Promote Java 8 to "yes" in support matrix | Critical | java |
| [HBASE-7781](https://issues.apache.org/jira/browse/HBASE-7781) | Update security unit tests to use a KDC if available | Blocker | security, test |
| [HBASE-12859](https://issues.apache.org/jira/browse/HBASE-12859) | New master API to track major compaction completion | Major | . |
| [HBASE-18792](https://issues.apache.org/jira/browse/HBASE-18792) | hbase-2 needs to defend against hbck operations | Blocker | hbck |
| [HBASE-19963](https://issues.apache.org/jira/browse/HBASE-19963) | TestFSHDFSUtils assumes wrong default port for Hadoop 3.0.1+ | Major | test |
| [HBASE-20386](https://issues.apache.org/jira/browse/HBASE-20386) | [DOC] Align WALPlayer help text and refguide | Minor | documentation |
| [HBASE-20365](https://issues.apache.org/jira/browse/HBASE-20365) | start branch-2.0 specific website section | Critical | documentation, website |
| [HBASE-14175](https://issues.apache.org/jira/browse/HBASE-14175) | Adopt releasedocmaker for better generated release notes | Critical | . |
| [HBASE-14348](https://issues.apache.org/jira/browse/HBASE-14348) | Update download mirror link | Major | documentation, website |
| [HBASE-20299](https://issues.apache.org/jira/browse/HBASE-20299) | Update MOB in hbase refguide | Minor | mob |
| [HBASE-20132](https://issues.apache.org/jira/browse/HBASE-20132) | Change the "KV" to "Cell" for web UI | Minor | . |
| [HBASE-20199](https://issues.apache.org/jira/browse/HBASE-20199) | Add test to prevent further permission regression around table flush and snapshot | Critical | test |
| [HBASE-20223](https://issues.apache.org/jira/browse/HBASE-20223) | Use hbase-thirdparty 2.1.0 | Blocker | dependencies |
| [HBASE-19158](https://issues.apache.org/jira/browse/HBASE-19158) | Ref guide needs upgrade update | Blocker | documentation |
| [HBASE-20212](https://issues.apache.org/jira/browse/HBASE-20212) | Make all Public classes have InterfaceAudience category | Critical | Usability |
| [HBASE-20246](https://issues.apache.org/jira/browse/HBASE-20246) | Remove the spark module | Blocker | . |
| [HBASE-19552](https://issues.apache.org/jira/browse/HBASE-19552) | update hbase to use new thirdparty libs | Major | dependencies, thirdparty |
| [HBASE-20171](https://issues.apache.org/jira/browse/HBASE-20171) | Remove o.a.h.h.ProcedureState | Minor | . |
| [HBASE-15151](https://issues.apache.org/jira/browse/HBASE-15151) | Rely on nightly tests for findbugs compliance on existing branch | Critical | build, test |
| [HBASE-20075](https://issues.apache.org/jira/browse/HBASE-20075) | remove logic for branch-1.1 nightly testing | Minor | test |
| [HBASE-20072](https://issues.apache.org/jira/browse/HBASE-20072) | remove 1.1 release line from the prerequisite tables | Major | community, documentation |
| [HBASE-18882](https://issues.apache.org/jira/browse/HBASE-18882) | [TEST] Run MR branch-1 jobs against hbase2 cluster | Critical | mapreduce, test |
| [HBASE-20093](https://issues.apache.org/jira/browse/HBASE-20093) | Replace ServerLoad by ServerMetrics for ServerManager | Major | . |
| [HBASE-20097](https://issues.apache.org/jira/browse/HBASE-20097) | Merge TableDescriptors#getAll and TableDescriptors#getAllDescriptors into one | Minor | . |
| [HBASE-20084](https://issues.apache.org/jira/browse/HBASE-20084) | Refactor the RSRpcServices#doBatchOp | Minor | regionserver |
| [HBASE-20092](https://issues.apache.org/jira/browse/HBASE-20092) | Fix TestRegionMetrics#testRegionMetrics | Minor | test |
| [HBASE-20088](https://issues.apache.org/jira/browse/HBASE-20088) | Update copyright notices to year 2018 | Minor | . |
| [HBASE-20089](https://issues.apache.org/jira/browse/HBASE-20089) | make\_rc.sh should name SHA-512 checksum files with the extension .sha512 | Minor | . |
| [HBASE-18596](https://issues.apache.org/jira/browse/HBASE-18596) | [TEST] A hbase1 cluster should be able to replicate to a hbase2 cluster; verify | Blocker | . |
| [HBASE-19947](https://issues.apache.org/jira/browse/HBASE-19947) | MR jobs using ITU use wrong filesystem | Critical | integration tests |
| [HBASE-19946](https://issues.apache.org/jira/browse/HBASE-19946) | TestPerColumnFamilyFlush and TestWalAndCompactingMemStoreFlush fail against h3 | Major | test |
| [HBASE-19922](https://issues.apache.org/jira/browse/HBASE-19922) | ProtobufUtils::PRIMITIVES is unused | Major | Protobufs |
| [HBASE-19720](https://issues.apache.org/jira/browse/HBASE-19720) | Rename WALKey#getTabnename to WALKey#getTableName | Major | . |
| [HBASE-15042](https://issues.apache.org/jira/browse/HBASE-15042) | refactor so that site materials are in the Standard Maven Place | Minor | build, website |
| [HBASE-19596](https://issues.apache.org/jira/browse/HBASE-19596) | RegionMetrics/ServerMetrics/ClusterMetrics should apply to all public classes | Critical | Client |
| [HBASE-19620](https://issues.apache.org/jira/browse/HBASE-19620) | Add UT to confirm the race in MasterRpcServices.getProcedureResult | Minor | proc-v2, test |
| [HBASE-19652](https://issues.apache.org/jira/browse/HBASE-19652) | Turn down CleanerChore logging; too chatty | Major | . |
| [HBASE-19644](https://issues.apache.org/jira/browse/HBASE-19644) | add the checkstyle rule to reject the illegal imports | Major | . |
| [HBASE-19637](https://issues.apache.org/jira/browse/HBASE-19637) | Add .checkstyle to gitignore | Major | build |
| [HBASE-19550](https://issues.apache.org/jira/browse/HBASE-19550) | Wrap the cell passed via Mutation#add(Cell) to be of ExtendedCell | Major | . |
| [HBASE-18970](https://issues.apache.org/jira/browse/HBASE-18970) | The version of jruby we use now can't get interactive input from prompt | Critical | shell |
| [HBASE-19548](https://issues.apache.org/jira/browse/HBASE-19548) | Backport the missed doc fix from master to branch-2 | Major | . |
| [HBASE-19526](https://issues.apache.org/jira/browse/HBASE-19526) | Update hadoop version to 3.0 GA | Major | build, dependencies |
| [HBASE-19477](https://issues.apache.org/jira/browse/HBASE-19477) | Move and align documentation in hbase-annotations | Trivial | . |
| [HBASE-19267](https://issues.apache.org/jira/browse/HBASE-19267) | Eclipse project import issues on 2.0 | Major | build |
| [HBASE-19512](https://issues.apache.org/jira/browse/HBASE-19512) | Move EventType and ExecutorType from hbase-client to hbase-server | Major | regionserver |
| [HBASE-19485](https://issues.apache.org/jira/browse/HBASE-19485) | Minor improvement to TestCompactedHFilesDischarger | Trivial | . |
| [HBASE-18988](https://issues.apache.org/jira/browse/HBASE-18988) | Add release managers to reference guide | Trivial | documentation |
| [HBASE-19410](https://issues.apache.org/jira/browse/HBASE-19410) | Move zookeeper related UTs to hbase-zookeeper and mark them as ZKTests | Major | test, Zookeeper |
| [HBASE-19323](https://issues.apache.org/jira/browse/HBASE-19323) | Make netty engine default in hbase2 | Major | rpc |
| [HBASE-19416](https://issues.apache.org/jira/browse/HBASE-19416) | Document dynamic configurations currently support | Minor | documentation |
| [HBASE-19298](https://issues.apache.org/jira/browse/HBASE-19298) | CellScanner and CellScannable should be declared as IA.Public | Major | . |
| [HBASE-19408](https://issues.apache.org/jira/browse/HBASE-19408) | Remove WALActionsListener.Base | Trivial | . |
| [HBASE-19407](https://issues.apache.org/jira/browse/HBASE-19407) | [branch-2] Remove backup/restore | Blocker | . |
| [HBASE-19328](https://issues.apache.org/jira/browse/HBASE-19328) | Remove asked if splittable log messages | Minor | proc-v2 |
| [HBASE-19200](https://issues.apache.org/jira/browse/HBASE-19200) | make hbase-client only depend on ZKAsyncRegistry and ZNodePaths | Major | Client, Zookeeper |
| [HBASE-19123](https://issues.apache.org/jira/browse/HBASE-19123) | Purge 'complete' support from Coprocesor Observers | Major | Coprocessors |
| [HBASE-19241](https://issues.apache.org/jira/browse/HBASE-19241) | Improve javadoc for AsyncAdmin and cleanup warnings for the implementation classes | Major | documentation |
| [HBASE-14350](https://issues.apache.org/jira/browse/HBASE-14350) | Procedure V2 Phase 2: Assignment Manager | Blocker | master, proc-v2 |
| [HBASE-19224](https://issues.apache.org/jira/browse/HBASE-19224) | LICENSE failure for Hadoop 3.1 on dnsjava | Major | build |
| [HBASE-18817](https://issues.apache.org/jira/browse/HBASE-18817) | Pull hbase-spark module out of branch-2 | Blocker | spark |
| [HBASE-19217](https://issues.apache.org/jira/browse/HBASE-19217) | Update supplemental-models.xml for jetty-sslengine | Major | . |
| [HBASE-19179](https://issues.apache.org/jira/browse/HBASE-19179) | Remove hbase-prefix-tree | Critical | . |
| [HBASE-19176](https://issues.apache.org/jira/browse/HBASE-19176) | Remove hbase-native-client from branch-2 | Major | . |
| [HBASE-19097](https://issues.apache.org/jira/browse/HBASE-19097) | update testing to use Apache Yetus Test Patch version 0.6.0 | Major | build |
| [HBASE-19049](https://issues.apache.org/jira/browse/HBASE-19049) | Update kerby to 1.0.1 GA release | Major | dependencies |
| [HBASE-16338](https://issues.apache.org/jira/browse/HBASE-16338) | update jackson to 2.y | Major | dependencies |
| [HBASE-19007](https://issues.apache.org/jira/browse/HBASE-19007) | Align Services Interfaces in Master and RegionServer | Blocker | . |
| [HBASE-19043](https://issues.apache.org/jira/browse/HBASE-19043) | Purge TableWrapper and CoprocessorHConnnection | Major | Coprocessors |
| [HBASE-18991](https://issues.apache.org/jira/browse/HBASE-18991) | Remove RegionMergeRequest | Trivial | . |
| [HBASE-18927](https://issues.apache.org/jira/browse/HBASE-18927) | Add the DataType which is subset of KeyValue#Type to CellBuilder for building cell | Major | . |
| [HBASE-18833](https://issues.apache.org/jira/browse/HBASE-18833) | Ensure precommit personality is up to date on all active branches | Critical | test |
| [HBASE-10504](https://issues.apache.org/jira/browse/HBASE-10504) | Define Replication Interface | Blocker | Replication |
| [HBASE-18767](https://issues.apache.org/jira/browse/HBASE-18767) | Release hbase-2.0.0-alpha-3; Theme "Scrubbed API" | Major | . |
| [HBASE-18835](https://issues.apache.org/jira/browse/HBASE-18835) | The return type of ExtendedCell#deepClone should be ExtendedCell rather than Cell | Major | . |
| [HBASE-18766](https://issues.apache.org/jira/browse/HBASE-18766) | Make TableSnapshotScanner Audience Private | Major | . |
| [HBASE-18782](https://issues.apache.org/jira/browse/HBASE-18782) | Module untangling work | Major | . |
| [HBASE-18421](https://issues.apache.org/jira/browse/HBASE-18421) | update hadoop prerequisites docs to call out 2.8.1 | Major | community, dependencies, documentation |
| [HBASE-13868](https://issues.apache.org/jira/browse/HBASE-13868) | Correct "Disable automatic splitting" section in HBase book | Trivial | documentation |
| [HBASE-17972](https://issues.apache.org/jira/browse/HBASE-17972) | Remove mergePool from CompactSplitThread | Minor | regionserver |
| [HBASE-18768](https://issues.apache.org/jira/browse/HBASE-18768) | Move TestTableName to hbase-common from hbase-server | Major | . |
| [HBASE-17967](https://issues.apache.org/jira/browse/HBASE-17967) | clean up documentation references to -ROOT- table. | Minor | documentation |
| [HBASE-18710](https://issues.apache.org/jira/browse/HBASE-18710) | Move on to hbase-thirdparty 1.0.1 (it was just released). | Major | hbase-thirdparty |
| [HBASE-18705](https://issues.apache.org/jira/browse/HBASE-18705) | bin/hbase does not find cached\_classpath.txt | Major | . |
| [HBASE-18611](https://issues.apache.org/jira/browse/HBASE-18611) | Copy all tests from o.a.h.h.p.TestProtobufUtil to o.a.h.h.s.p.TestProtobufUtil | Minor | Protobufs, test |
| [HBASE-18670](https://issues.apache.org/jira/browse/HBASE-18670) | Add .DS\_Store to .gitignore | Minor | community |
| [HBASE-17614](https://issues.apache.org/jira/browse/HBASE-17614) | Move Backup/Restore into separate module | Blocker | . |
| [HBASE-18660](https://issues.apache.org/jira/browse/HBASE-18660) | Remove duplicate code from the checkAndPut method in HTable | Trivial | . |
| [HBASE-18653](https://issues.apache.org/jira/browse/HBASE-18653) | Undo hbase2 check against \< hadoop2.6.x; i.e. implement agreed drop of hadoop 2.4 and 2.5 support in hbase2 | Major | build |
| [HBASE-18630](https://issues.apache.org/jira/browse/HBASE-18630) | Prune dependencies; as is branch-2 has duplicates | Major | dependencies |
| [HBASE-18594](https://issues.apache.org/jira/browse/HBASE-18594) | Release hbase-2.0.0-alpha2 | Major | . |
| [HBASE-18623](https://issues.apache.org/jira/browse/HBASE-18623) | Frequent failed to parse at EOF warnings from WALEntryStream | Minor | . |
| [HBASE-18518](https://issues.apache.org/jira/browse/HBASE-18518) | Remove jersey1\* dependencies from project and jersey1\* jars from lib dir | Major | dependencies, pom, REST |
| [HBASE-18544](https://issues.apache.org/jira/browse/HBASE-18544) | Move the HRegion#addRegionToMETA to TestDefaultMemStore | Minor | regionserver |
| [HBASE-18582](https://issues.apache.org/jira/browse/HBASE-18582) | Correct the docs for Mutation#setCellVisibility | Minor | documentation |
| [HBASE-18588](https://issues.apache.org/jira/browse/HBASE-18588) | Verify we're using netty .so epolling on linux post HBASE-18271 | Major | test |
| [HBASE-18514](https://issues.apache.org/jira/browse/HBASE-18514) | Backport space quota "phase2" work to branch-2 | Blocker | . |
| [HBASE-18527](https://issues.apache.org/jira/browse/HBASE-18527) | update nightly builds to compensate for jenkins plugin upgrades | Blocker | community, test |
| [HBASE-18515](https://issues.apache.org/jira/browse/HBASE-18515) | Introduce Delete.add as a replacement for Delete#addDeleteMarker | Major | Client |
| [HBASE-16100](https://issues.apache.org/jira/browse/HBASE-16100) | Procedure V2 - Tools | Minor | proc-v2, tooling |
| [HBASE-15141](https://issues.apache.org/jira/browse/HBASE-15141) | Procedure V2 - Web UI | Blocker | proc-v2, UI |
| [HBASE-18465](https://issues.apache.org/jira/browse/HBASE-18465) | [AMv2] remove old split region code that is no longer needed | Major | Admin, rpc |
| [HBASE-16728](https://issues.apache.org/jira/browse/HBASE-16728) | Add hadoop.profile=3.0 pass to precommit checks. | Major | build, hadoop3 |
| [HBASE-18384](https://issues.apache.org/jira/browse/HBASE-18384) | Add link to refguide schema section on apache blog on hbase application archetypes | Minor | documentation |
| [HBASE-18344](https://issues.apache.org/jira/browse/HBASE-18344) | Introduce Append.addColumn as a replacement for Append.add | Trivial | . |
| [HBASE-18364](https://issues.apache.org/jira/browse/HBASE-18364) | Downgrade surefire | Major | . |
| [HBASE-18291](https://issues.apache.org/jira/browse/HBASE-18291) | Regenerate thrift2 python examples | Minor | . |
| [HBASE-18288](https://issues.apache.org/jira/browse/HBASE-18288) | Declared dependency on specific javax.ws.rs | Major | dependencies, REST |
| [HBASE-18284](https://issues.apache.org/jira/browse/HBASE-18284) | Update hbasecon asia logo on home page of hbase.apache.org | Major | . |
| [HBASE-12794](https://issues.apache.org/jira/browse/HBASE-12794) | Guidelines for filing JIRA issues | Major | documentation |
| [HBASE-18258](https://issues.apache.org/jira/browse/HBASE-18258) | Take down hbasecon2017 logo from hbase.apache.org and put up hbaseconasia2017 instead. | Major | . |
| [HBASE-17954](https://issues.apache.org/jira/browse/HBASE-17954) | Switch findbugs implementation to spotbugs | Major | build, community, test |
| [HBASE-17898](https://issues.apache.org/jira/browse/HBASE-17898) | Update dependencies | Critical | . |
| [HBASE-18187](https://issues.apache.org/jira/browse/HBASE-18187) | Release hbase-2.0.0-alpha1 | Major | . |
| [HBASE-18096](https://issues.apache.org/jira/browse/HBASE-18096) | Limit HFileUtil visibility and add missing annotations | Trivial | . |
| [HBASE-13074](https://issues.apache.org/jira/browse/HBASE-13074) | Cleaned up usage of hbase.master.lease.thread.wakefrequency | Trivial | wal |
| [HBASE-17968](https://issues.apache.org/jira/browse/HBASE-17968) | Update copyright year in NOTICE file | Trivial | build |
| [HBASE-17965](https://issues.apache.org/jira/browse/HBASE-17965) | Canary tool should print the regionserver name on failure | Minor | . |
| [HBASE-17828](https://issues.apache.org/jira/browse/HBASE-17828) | Revisit the IS annotation and the documentation | Critical | API |
| [HBASE-16215](https://issues.apache.org/jira/browse/HBASE-16215) | clean up references for EOM release lines | Major | community, website |
| [HBASE-17847](https://issues.apache.org/jira/browse/HBASE-17847) | update documentation to include positions on recent Hadoop releases | Critical | community, documentation |
| [HBASE-17834](https://issues.apache.org/jira/browse/HBASE-17834) | close stale github PRs | Minor | community |
| [HBASE-17802](https://issues.apache.org/jira/browse/HBASE-17802) | Add note that minor versions can add methods to Interfaces | Major | documentation |
| [HBASE-17782](https://issues.apache.org/jira/browse/HBASE-17782) | Extend IdReadWriteLock to support using both weak and soft reference | Major | . |
| [HBASE-17618](https://issues.apache.org/jira/browse/HBASE-17618) | Refactor the implementation of modify table and delete column in MOB | Major | mob |
| [HBASE-17609](https://issues.apache.org/jira/browse/HBASE-17609) | Allow for region merging in the UI | Major | . |
| [HBASE-16812](https://issues.apache.org/jira/browse/HBASE-16812) | Clean up the locks in MOB | Minor | mob |
| [HBASE-17502](https://issues.apache.org/jira/browse/HBASE-17502) | Document hadoop pre-2.6.1 and Java 1.8 Kerberos problem in our hadoop support matrix | Major | . |
| [HBASE-16710](https://issues.apache.org/jira/browse/HBASE-16710) | Add ZStandard Codec to Compression.java | Minor | . |
| [HBASE-17401](https://issues.apache.org/jira/browse/HBASE-17401) | Remove unnecessary semicolons in hbase-annotations | Trivial | . |
| [HBASE-17397](https://issues.apache.org/jira/browse/HBASE-17397) | AggregationClient cleanup | Minor | . |
| [HBASE-16869](https://issues.apache.org/jira/browse/HBASE-16869) | Typo in "Disabling Blockcache" doc | Trivial | documentation |
| [HBASE-17272](https://issues.apache.org/jira/browse/HBASE-17272) | Doc how to run Standalone HBase over an HDFS instance; all daemons in one JVM but persisting to an HDFS instance | Major | documentation |
| [HBASE-17121](https://issues.apache.org/jira/browse/HBASE-17121) | Undo the building of xref as part of site build | Major | . |
| [HBASE-16335](https://issues.apache.org/jira/browse/HBASE-16335) | update to latest apache parent pom | Major | build, dependencies |
| [HBASE-17046](https://issues.apache.org/jira/browse/HBASE-17046) | Add 1.1 doc to hbase.apache.org | Major | website |
| [HBASE-16955](https://issues.apache.org/jira/browse/HBASE-16955) | Fixup precommit protoc check to do new distributed protos and pb 3.1.0 build | Major | build, Protobufs |
| [HBASE-16413](https://issues.apache.org/jira/browse/HBASE-16413) | Add apache-hbase.slack.com #users channel to ref guide | Minor | documentation |
| [HBASE-16952](https://issues.apache.org/jira/browse/HBASE-16952) | Replace hadoop-maven-plugins with protobuf-maven-plugin for building protos | Major | build |
| [HBASE-16811](https://issues.apache.org/jira/browse/HBASE-16811) | Remove mob sweep job | Minor | . |
| [HBASE-16591](https://issues.apache.org/jira/browse/HBASE-16591) | Add a docker file only contains java 8 for running pre commit on master | Blocker | build |
| [HBASE-16518](https://issues.apache.org/jira/browse/HBASE-16518) | Remove old .arcconfig file | Trivial | tooling |
| [HBASE-16376](https://issues.apache.org/jira/browse/HBASE-16376) | Document implicit side-effects on partial results when calling Scan#setBatch(int) | Minor | API, documentation |
| [HBASE-16467](https://issues.apache.org/jira/browse/HBASE-16467) | Move AbstractHBaseTool to hbase-common | Trivial | . |
| [HBASE-16260](https://issues.apache.org/jira/browse/HBASE-16260) | Audit dependencies for Category-X | Critical | community, dependencies |
| [HBASE-16426](https://issues.apache.org/jira/browse/HBASE-16426) | Remove company affiliations from committer list | Major | documentation, website |
| [HBASE-16354](https://issues.apache.org/jira/browse/HBASE-16354) | Clean up defunct GitHub PRs | Major | community |
| [HBASE-15656](https://issues.apache.org/jira/browse/HBASE-15656) | Fix unused protobuf warning in Admin.proto | Minor | . |
| [HBASE-16073](https://issues.apache.org/jira/browse/HBASE-16073) | update compatibility\_checker for jacc dropping comma sep args | Critical | build, documentation |
| [HBASE-15989](https://issues.apache.org/jira/browse/HBASE-15989) | Remove hbase.online.schema.update.enable | Major | . |
| [HBASE-15888](https://issues.apache.org/jira/browse/HBASE-15888) | Extend HBASE-12769 for bulk load data replication | Major | Replication |
| [HBASE-15895](https://issues.apache.org/jira/browse/HBASE-15895) | remove unmaintained jenkins build analysis tool. | Minor | build |
| [HBASE-14635](https://issues.apache.org/jira/browse/HBASE-14635) | Fix flaky test TestSnapshotCloneIndependence | Major | test |
| [HBASE-4368](https://issues.apache.org/jira/browse/HBASE-4368) | Expose processlist in shell (per regionserver and perhaps by cluster) | Major | shell |
| [HBASE-15646](https://issues.apache.org/jira/browse/HBASE-15646) | Add some docs about exporting and importing snapshots using S3 | Major | documentation, snapshots |
| [HBASE-15729](https://issues.apache.org/jira/browse/HBASE-15729) | Remove old JDiff wrapper scripts in dev-support | Minor | build, community |
| [HBASE-15644](https://issues.apache.org/jira/browse/HBASE-15644) | Add maven-scala-plugin for scaladoc | Major | build |
| [HBASE-15494](https://issues.apache.org/jira/browse/HBASE-15494) | Close obviated PRs on github | Major | community |
| [HBASE-14678](https://issues.apache.org/jira/browse/HBASE-14678) | Experiment: Temporarily disable balancer and a few others to see if root of crashed/timedout JVMs | Critical | test |
| [HBASE-15502](https://issues.apache.org/jira/browse/HBASE-15502) | Skeleton unit test to copy/paste | Major | documentation |
| [HBASE-15220](https://issues.apache.org/jira/browse/HBASE-15220) | Change two logs in SimpleRegionNormalizer to INFO level | Minor | . |
| [HBASE-15017](https://issues.apache.org/jira/browse/HBASE-15017) | Close out GitHub pull requests that aren't likely to update into a usable patch | Trivial | community |
| [HBASE-14526](https://issues.apache.org/jira/browse/HBASE-14526) | Remove delayed rpc | Major | . |
| [HBASE-15099](https://issues.apache.org/jira/browse/HBASE-15099) | Move RegionStateListener class out of quotas package | Minor | . |
| [HBASE-15007](https://issues.apache.org/jira/browse/HBASE-15007) | update Hadoop support matrix to list 2.6.1+ as supported | Major | documentation, Operability |
| [HBASE-15003](https://issues.apache.org/jira/browse/HBASE-15003) | Remove BoundedConcurrentLinkedQueue and associated test | Minor | util |
| [HBASE-11985](https://issues.apache.org/jira/browse/HBASE-11985) | Document sizing rules of thumb | Major | documentation |
| [HBASE-14994](https://issues.apache.org/jira/browse/HBASE-14994) | Clean up some broken links and references to old APIs | Major | documentation |
| [HBASE-14534](https://issues.apache.org/jira/browse/HBASE-14534) | Bump yammer/coda/dropwizard metrics dependency version | Minor | . |
| [HBASE-14851](https://issues.apache.org/jira/browse/HBASE-14851) | Add test showing how to use TTL from thrift | Major | test, Thrift |
| [HBASE-14516](https://issues.apache.org/jira/browse/HBASE-14516) | categorize hadoop-compat tests | Critical | build, hadoop2, test |
| [HBASE-14308](https://issues.apache.org/jira/browse/HBASE-14308) | HTableDescriptor WARN is not actionable | Minor | Usability |
| [HBASE-14732](https://issues.apache.org/jira/browse/HBASE-14732) | Update HBase website skin and CSS | Major | documentation |
| [HBASE-14764](https://issues.apache.org/jira/browse/HBASE-14764) | Stop using post-site target | Major | documentation |
| [HBASE-14713](https://issues.apache.org/jira/browse/HBASE-14713) | Remove simple deprecated-since-1.0 code in hbase-server from hbase 2.0 | Major | . |
| [HBASE-14762](https://issues.apache.org/jira/browse/HBASE-14762) | Update docs about publishing website to show gitsubpub method instead of svnsubpub | Critical | documentation |
| [HBASE-14481](https://issues.apache.org/jira/browse/HBASE-14481) | Decommission HBase wiki | Blocker | documentation |
| [HBASE-11720](https://issues.apache.org/jira/browse/HBASE-11720) | Set up jenkins job to build site documentation | Minor | build, documentation |
| [HBASE-14026](https://issues.apache.org/jira/browse/HBASE-14026) | Clarify "Web API" in version and compatibility docs | Critical | documentation |
| [HBASE-13867](https://issues.apache.org/jira/browse/HBASE-13867) | Add endpoint coprocessor guide to HBase book | Major | Coprocessors, documentation |
| [HBASE-14652](https://issues.apache.org/jira/browse/HBASE-14652) | Improve / update publish-website script in dev-support | Major | scripts |
| [HBASE-14493](https://issues.apache.org/jira/browse/HBASE-14493) | Upgrade the jamon-runtime dependency | Minor | . |
| [HBASE-14502](https://issues.apache.org/jira/browse/HBASE-14502) | Purge use of jmock and remove as dependency | Major | test |
| [HBASE-14271](https://issues.apache.org/jira/browse/HBASE-14271) | Improve Nexus staging instructions | Minor | build, documentation |
| [HBASE-14424](https://issues.apache.org/jira/browse/HBASE-14424) | Document that DisabledRegionSplitPolicy blocks manual splits | Minor | documentation |
| [HBASE-14482](https://issues.apache.org/jira/browse/HBASE-14482) | Add hadoop 2.6.1 to the test-patch build list | Minor | build |
| [HBASE-14227](https://issues.apache.org/jira/browse/HBASE-14227) | Fold special cased MOB APIs into existing APIs | Blocker | mob |
| [HBASE-14361](https://issues.apache.org/jira/browse/HBASE-14361) | ReplicationSink should create Connection instances lazily | Major | Replication |
| [HBASE-14253](https://issues.apache.org/jira/browse/HBASE-14253) | update docs + build for maven 3.0.4+ | Major | build, documentation |
| [HBASE-14318](https://issues.apache.org/jira/browse/HBASE-14318) | make\_rc.sh should purge/re-resolve dependencies from local repository | Major | build |
| [HBASE-14290](https://issues.apache.org/jira/browse/HBASE-14290) | Spin up less threads in tests | Major | test |
| [HBASE-14091](https://issues.apache.org/jira/browse/HBASE-14091) | Update site documentation with code of conduct and project policy for transgressions | Major | documentation, website |
| [HBASE-14288](https://issues.apache.org/jira/browse/HBASE-14288) | Upgrade asciidoctor plugin to v1.5.2.1 | Minor | build |
| [HBASE-14085](https://issues.apache.org/jira/browse/HBASE-14085) | Correct LICENSE and NOTICE files in artifacts | Blocker | build |
| [HBASE-13089](https://issues.apache.org/jira/browse/HBASE-13089) | Fix test compilation error on building against htrace-3.2.0-incubating | Minor | . |
| [HBASE-14081](https://issues.apache.org/jira/browse/HBASE-14081) | (outdated) references to SVN/trunk in documentation | Minor | documentation, website |
| [HBASE-14071](https://issues.apache.org/jira/browse/HBASE-14071) | Document troubleshooting unexpected filesystem usage by snapshots and WALs | Major | . |
| [HBASE-13446](https://issues.apache.org/jira/browse/HBASE-13446) | Add docs warning about missing data for downstream on versions prior to HBASE-13262 | Critical | documentation |
| [HBASE-14057](https://issues.apache.org/jira/browse/HBASE-14057) | HBase shell user\_permission should list super users defined on hbase-site.xml | Minor | shell |
| [HBASE-11276](https://issues.apache.org/jira/browse/HBASE-11276) | Add back support for running ChaosMonkey as standalone tool | Minor | . |
| [HBASE-14052](https://issues.apache.org/jira/browse/HBASE-14052) | Mark a few methods in CellUtil audience private since only make sense internally to hbase | Trivial | API |
| [HBASE-14053](https://issues.apache.org/jira/browse/HBASE-14053) | Disable DLR in branch-1+ | Major | Recovery |
| [HBASE-13869](https://issues.apache.org/jira/browse/HBASE-13869) | Fix typo in HBase book | Trivial | documentation |
| [HBASE-13964](https://issues.apache.org/jira/browse/HBASE-13964) | Skip region normalization for tables under namespace quota | Major | Balancer, Usability |
| [HBASE-13948](https://issues.apache.org/jira/browse/HBASE-13948) | Expand hadoop2 versions built on the pre-commit | Major | build |
| [HBASE-13956](https://issues.apache.org/jira/browse/HBASE-13956) | Add myself as 1.1 release manager | Trivial | website |
| [HBASE-13915](https://issues.apache.org/jira/browse/HBASE-13915) | Remove EOL HBase versions from java and hadoop prereq tables | Major | documentation |
| [HBASE-13929](https://issues.apache.org/jira/browse/HBASE-13929) | make\_rc.sh publishes empty shaded artifacts | Minor | build |
| [HBASE-13666](https://issues.apache.org/jira/browse/HBASE-13666) | book.pdf is not renamed during site build | Major | website |
| [HBASE-13660](https://issues.apache.org/jira/browse/HBASE-13660) | Add link to cloud bigtable schema modeling guide into our refguide | Major | documentation |
| [HBASE-13799](https://issues.apache.org/jira/browse/HBASE-13799) | javadoc how Scan gets polluted when used; if you set attributes or ask for scan metrics | Minor | documentation |
| [HBASE-13726](https://issues.apache.org/jira/browse/HBASE-13726) | stop using Hadoop's IOUtils | Major | dependencies |
| [HBASE-13716](https://issues.apache.org/jira/browse/HBASE-13716) | Stop using Hadoop's FSConstants | Blocker | Filesystem Integration |
| [HBASE-13582](https://issues.apache.org/jira/browse/HBASE-13582) | Update docs for HTrace | Minor | documentation |
| [HBASE-13713](https://issues.apache.org/jira/browse/HBASE-13713) | See about dropping ClassLoaderBase#getClassLoadingLock | Minor | . |
| [HBASE-13586](https://issues.apache.org/jira/browse/HBASE-13586) | Update book on Hadoop and Java supported versions for 1.1.x | Major | documentation |
| [HBASE-11677](https://issues.apache.org/jira/browse/HBASE-11677) | Make Logger instance modifiers consistent | Minor | util |
| [HBASE-13554](https://issues.apache.org/jira/browse/HBASE-13554) | Update book clarifying API stability guarantees | Major | documentation |
| [HBASE-13487](https://issues.apache.org/jira/browse/HBASE-13487) | Doc KEEP\_DELETED\_CELLS | Major | documentation |
| [HBASE-13187](https://issues.apache.org/jira/browse/HBASE-13187) | Add ITBLL that exercises per CF flush | Critical | integration tests |
| [HBASE-13361](https://issues.apache.org/jira/browse/HBASE-13361) | Remove or undeprecate {get\|set}ScannerCaching in HTable | Minor | Client |
| [HBASE-13310](https://issues.apache.org/jira/browse/HBASE-13310) | Fix high priority findbugs warnings | Major | . |
| [HBASE-13257](https://issues.apache.org/jira/browse/HBASE-13257) | Show coverage report on jenkins | Minor | . |
| [HBASE-13233](https://issues.apache.org/jira/browse/HBASE-13233) | add hbase-11339 branch to the patch testing script | Minor | . |
| [HBASE-13237](https://issues.apache.org/jira/browse/HBASE-13237) | Improve trademark marks on the hbase.apache.org homepage | Minor | documentation |
| [HBASE-13234](https://issues.apache.org/jira/browse/HBASE-13234) | Improve the obviousness of the download link on hbase.apache.org | Minor | documentation |
| [HBASE-7126](https://issues.apache.org/jira/browse/HBASE-7126) | Update website with info on how to report security bugs | Critical | documentation |
| [HBASE-12466](https://issues.apache.org/jira/browse/HBASE-12466) | Document visibility scan label generator usage and behavior | Major | documentation, security |
| [HBASE-13177](https://issues.apache.org/jira/browse/HBASE-13177) | Document HBASE-13012 | Major | documentation, mob |
| [HBASE-11670](https://issues.apache.org/jira/browse/HBASE-11670) | Build PDF of Ref Guide | Minor | documentation |
| [HBASE-12180](https://issues.apache.org/jira/browse/HBASE-12180) | Fix and reenable TestRegionReplicaReplicationEndpoint | Major | test |
| [HBASE-12995](https://issues.apache.org/jira/browse/HBASE-12995) | Document that HConnection#getTable methods do not check table existence since 0.98.1 | Trivial | . |
| [HBASE-13079](https://issues.apache.org/jira/browse/HBASE-13079) | Add an admonition to Scans example that the results scanner should be closed | Major | documentation |
| [HBASE-12168](https://issues.apache.org/jira/browse/HBASE-12168) | Document Rest gateway SPNEGO-based authentication for client | Major | documentation, REST, security |
| [HBASE-12701](https://issues.apache.org/jira/browse/HBASE-12701) | Document how to set the split policy on a given table | Major | documentation |
| [HBASE-12783](https://issues.apache.org/jira/browse/HBASE-12783) | Create efficient RegionLocator implementation | Major | . |
| [HBASE-12785](https://issues.apache.org/jira/browse/HBASE-12785) | Use FutureTask to timeout the attempt to get the lock for hbck | Minor | . |
| [HBASE-12623](https://issues.apache.org/jira/browse/HBASE-12623) | Remove pre-0.96 to 0.96 upgrade code | Major | . |
| [HBASE-12589](https://issues.apache.org/jira/browse/HBASE-12589) | Forward-port fix for TestFromClientSideWithCoprocessor.testMaxKeyValueSize | Major | test |
| [HBASE-12515](https://issues.apache.org/jira/browse/HBASE-12515) | update test-patch to use git | Minor | build |
| [HBASE-12438](https://issues.apache.org/jira/browse/HBASE-12438) | Add -Dsurefire.rerunFailingTestsCount=2 to patch build runs so flakies get rerun | Major | test |
| [HBASE-12362](https://issues.apache.org/jira/browse/HBASE-12362) | Interim documentation of important master and regionserver metrics | Major | documentation |
| [HBASE-12239](https://issues.apache.org/jira/browse/HBASE-12239) | Document hedged reads | Major | documentation |
| [HBASE-11791](https://issues.apache.org/jira/browse/HBASE-11791) | Update docs on visibility tags and ACLs, transparent encryption, secure bulk upload | Major | documentation |
| [HBASE-11961](https://issues.apache.org/jira/browse/HBASE-11961) | Document region state transitions | Minor | . |
| [HBASE-11619](https://issues.apache.org/jira/browse/HBASE-11619) | Remove unused test class from TestHLogSplit | Trivial | wal |
| [HBASE-4593](https://issues.apache.org/jira/browse/HBASE-4593) | Design and document the official procedure for posting patches, commits, commit messages, etc. to smooth process and make integration with tools easier | Major | documentation |
| [HBASE-11729](https://issues.apache.org/jira/browse/HBASE-11729) | Document HFile v3 | Trivial | documentation, HFile |
| [HBASE-11606](https://issues.apache.org/jira/browse/HBASE-11606) | Enable ZK-less region assignment by default | Minor | . |
| [HBASE-10398](https://issues.apache.org/jira/browse/HBASE-10398) | HBase book updates for Replication after HBASE-10322 | Major | documentation |
| [HBASE-11459](https://issues.apache.org/jira/browse/HBASE-11459) | Add more doc on compression codecs, how to hook up native lib, lz4, etc. | Minor | documentation |
| [HBASE-8450](https://issues.apache.org/jira/browse/HBASE-8450) | Update hbase-default.xml and general recommendations to better suit current hw, h2, experience, etc. | Critical | Usability |
> NOTE: Below pre-2.0.0 changes were generated otherwise. Imported as-is, unaltered.
```
Release Notes - HBase - Version 1.0.0 02/20/2015
** Sub-task
* [HBASE-11852] - Still see "UnsupportedOperationException: CollectionUsage threshold is not supported"
* [HBASE-12485] - Maintain SeqId monotonically increasing
* [HBASE-12511] - namespace permissions - add support from table creation privilege in a namespace 'C'
* [HBASE-12568] - Adopt Semantic Versioning and document it in the book
* [HBASE-12575] - Sanity check table coprocessor classes are loadable
* [HBASE-12606] - Sanity check encryption configuration before opening WAL or onlining regions
* [HBASE-12679] - Add HBaseInterfaceAudience.TOOLS and move some of the Public classes to LimitedPrivate
* [HBASE-12704] - Add demo client which uses doAs functionality on Thrift-over-HTTPS.
* [HBASE-12730] - Backport HBASE-5162 (Basic client pushback mechanism) to branch-1
* [HBASE-12735] - Refactor TAG so it can live as unit test and as an integration test
* [HBASE-12763] - Make it so there must be WALs for a server to be marked dead
* [HBASE-12776] - SpliTransaction: Log number of files to be split
* [HBASE-12779] - SplitTransaction: Add metrics
* [HBASE-12793] - [hbck] closeRegionSilentlyAndWait() should log cause of IOException and retry until hbase.hbck.close.timeout expires
* [HBASE-12802] - Remove unnecessary Table.flushCommits()
* [HBASE-12926] - Backport HBASE-12688 (Update site with a bootstrap-based UI) for HBASE-12918
* [HBASE-12980] - Delete of a table may not clean all rows from hbase:meta
** Bug
* [HBASE-8026] - HBase Shell docs for scan command does not reference VERSIONS
* [HBASE-9431] - Set 'hbase.bulkload.retries.number' to 10 as HBASE-8450 claims
* [HBASE-9910] - TestHFilePerformance and HFilePerformanceEvaluation should be merged in a single HFile performance test class.
* [HBASE-10499] - In write heavy scenario one of the regions does not get flushed causing RegionTooBusyException
* [HBASE-10528] - DefaultBalancer selects plans to move regions onto draining nodes
* [HBASE-11979] - Compaction progress reporting is wrong
* [HBASE-12028] - Abort the RegionServer, when it's handler threads die
* [HBASE-12070] - Add an option to hbck to fix ZK inconsistencies
* [HBASE-12108] - HBaseConfiguration: set classloader before loading xml files
* [HBASE-12267] - Replace HTable constructor in mapreduce.* classes with ConnectionFactory
* [HBASE-12270] - A bug in the bucket cache, with cache blocks on write enabled
* [HBASE-12339] - WAL performance evaluation tool doesn't roll logs
* [HBASE-12348] - preModifyColumn and preDeleteColumn in AC denies user to perform its operation though it has required rights
* [HBASE-12393] - The regionserver web will throw exception if we disable block cache
* [HBASE-12422] - Use ConnectionFactory in HTable constructors
* [HBASE-12431] - Use of getColumnLatestCell(byte[], int, int, byte[], int, int) is Not Thread Safe
* [HBASE-12454] - Setting didPerformCompaction early in HRegion#compact
* [HBASE-12467] - Master joins cluster but never completes initialization
* [HBASE-12480] - Regions in FAILED_OPEN/FAILED_CLOSE should be processed on master failover
* [HBASE-12564] - consolidate the getTableDescriptors() semantic
* [HBASE-12565] - Race condition in HRegion.batchMutate() causes partial data to be written when region closes
* [HBASE-12574] - Update replication metrics to not do so many map look ups.
* [HBASE-12585] - Fix refguide so it does hbase 1.0 style API everywhere with callout on how we used to do it in pre-1.0
* [HBASE-12607] - TestHBaseFsck#testParallelHbck fails running against hadoop 2.6.0
* [HBASE-12611] - Create autoCommit() method and remove clearBufferOnFail
* [HBASE-12617] - Running IntegrationTestBigLinkedList against cluster getting not an instance of org.apache.hadoop.hbase.MiniHBaseCluster
* [HBASE-12618] - Add 'Namespace' to headers while displaying user permissions.
* [HBASE-12622] - user_permission should require global admin to display global and ns permissions
* [HBASE-12632] - ThrottledInputStream/ExportSnapshot does not throttle
* [HBASE-12634] - Fix the AccessController#requireGlobalPermission(ns) with NS
* [HBASE-12635] - Delete acl notify znode of table after the table is deleted
* [HBASE-12637] - Compilation with Hadoop-2.4- is broken
* [HBASE-12642] - LoadIncrementalHFiles does not throw exception after hitting hbase.bulkload.retries.number setting
* [HBASE-12644] - Visibility Labels: issue with storing super users in labels table
* [HBASE-12647] - Truncate table should work with C as well
* [HBASE-12652] - Allow unmanaged connections in MetaTableAccessor
* [HBASE-12655] - WALPerformanceEvaluation miscalculates append/sync statistics for multiple regions
* [HBASE-12661] - rat check fails for several files
* [HBASE-12662] - region_status.rb is failing with NoMethodError
* [HBASE-12663] - unify getTableDescriptors() and listTableDescriptorsByNamespace()
* [HBASE-12664] - TestDefaultLoadBalancer.testBalanceCluster fails in CachedDNSToSwitchMapping
* [HBASE-12665] - When aborting, dump metrics
* [HBASE-12666] - TestAssignmentManager hanging; add timeouts
* [HBASE-12671] - HBASE-12652 broke branch-1 builds (TestAssignmentManager fails)
* [HBASE-12674] - Add permission check to getNamespaceDescriptor()
* [HBASE-12675] - Use interface methods in shell scripts
* [HBASE-12681] - truncate_preserve command fails with undefined method `getTable' error
* [HBASE-12683] - Compilation with hadoop-2.7.0-SNAPSHOT is broken
* [HBASE-12686] - Failures in split before PONR not clearing the daughter regions from regions in transition during rollback
* [HBASE-12692] - NPE from SnapshotManager#stop
* [HBASE-12694] - testTableExistsIfTheSpecifiedTableRegionIsSplitParent in TestSplitTransactionOnCluster class leaves regions in transition
* [HBASE-12696] - Possible NPE in HRegionFileSystem#splitStoreFile when skipStoreFileRangeCheck in splitPolicy return true
* [HBASE-12697] - Don't use RegionLocationFinder if localityCost == 0
* [HBASE-12699] - undefined method `setAsyncLogFlush' exception thrown when setting DEFERRED_LOG_FLUSH=>true
* [HBASE-12711] - Fix new findbugs warnings in hbase-thrift module
* [HBASE-12715] - getLastSequenceId always returns -1
* [HBASE-12716] - A bug in RegionSplitter.UniformSplit algorithm
* [HBASE-12718] - Convert TestAcidGuarantees from a unit test to an integration test
* [HBASE-12728] - buffered writes substantially less useful after removal of HTablePool
* [HBASE-12732] - Log messages in FileLink$FileLinkInputStream#tryOpen are reversed
* [HBASE-12739] - Avoid too large identifier of ZooKeeperWatcher
* [HBASE-12740] - Improve performance of TestHBaseFsck
* [HBASE-12741] - AccessController contains a javadoc issue
* [HBASE-12742] - ClusterStatusPublisher crashes with a IPv6 network interface.
* [HBASE-12744] - hbase-default.xml lists hbase.regionserver.global.memstore.size twice
* [HBASE-12746] - [1.0.0RC0] Distributed Log Replay is on (HBASE-12577 was insufficient)
* [HBASE-12747] - IntegrationTestMTTR will OOME if launched with mvn verify
* [HBASE-12750] - getRequestsCount() in ClusterStatus returns total number of request
* [HBASE-12767] - Fix a StoreFileScanner NPE in reverse scan flow
* [HBASE-12771] - TestFailFast#testFastFail failing
* [HBASE-12774] - Fix the inconsistent permission checks for bulkloading.
* [HBASE-12781] - thrift2 listen port will bind always to the passed command line address
* [HBASE-12782] - ITBLL fails for me if generator does anything but 5M per maptask
* [HBASE-12791] - HBase does not attempt to clean up an aborted split when the regionserver shutting down
* [HBASE-12798] - Map Reduce jobs should not create Tables in setConf()
* [HBASE-12801] - Failed to truncate a table while maintaing binary region boundaries
* [HBASE-12804] - ImportTsv fails to delete partition files created by it
* [HBASE-12810] - Update to htrace-incubating
* [HBASE-12811] - [AccessController] NPE while scanning a table with user not having READ permission on the namespace
* [HBASE-12817] - Data missing while scanning using PREFIX_TREE data block encoding
* [HBASE-12819] - ExportSnapshot doesn't close FileSystem instances
* [HBASE-12824] - CompressionTest fails with org.apache.hadoop.hbase.io.hfile.AbstractHFileReader$NotSeekedException: Not seeked to a key/value
* [HBASE-12831] - Changing the set of vis labels a user has access to doesn't generate an audit log event
* [HBASE-12832] - Describe table from shell no longer shows Table's attributes, only CF attributes
* [HBASE-12833] - [shell] table.rb leaks connections
* [HBASE-12835] - HBASE-12422 changed new HTable(Configuration) to not use managed Connections anymore
* [HBASE-12837] - ReplicationAdmin leaks zk connections
* [HBASE-12844] - ServerManager.isServerReacable() should sleep between retries
* [HBASE-12847] - TestZKLessSplitOnCluster frequently times out in 0.98 builds
* [HBASE-12862] - Uppercase "wals" in RegionServer webUI
* [HBASE-12863] - Master info port on RS UI is always 0
* [HBASE-12864] - IntegrationTestTableSnapshotInputFormat fails
* [HBASE-12874] - LoadIncrementalHFiles should use unmanaged connection
* [HBASE-12878] - Incorrect HFile path in TestHFilePerformance print output (fix for easier debugging)
* [HBASE-12881] - TestFastFail is not compatible with surefire.rerunFailingTestsCount
* [HBASE-12886] - Correct tag option name in PerformanceEvaluation
* [HBASE-12892] - Add a class to allow taking a snapshot from the command line
* [HBASE-12897] - Minimum memstore size is a percentage
* [HBASE-12898] - Add in used undeclared dependencies
* [HBASE-12901] - Possible deadlock while onlining a region and get region plan for other region run parallel
* [HBASE-12904] - Threading issues in region_mover.rb
* [HBASE-12915] - Disallow small scan with batching
* [HBASE-12916] - No access control for replicating WAL entries
* [HBASE-12917] - HFilePerformanceEvaluation Scan tests fail with StackOverflowError due to recursive call in createCell function
* [HBASE-12918] - Backport asciidoc changes
* [HBASE-12919] - Compilation with Hadoop-2.4- is broken again
* [HBASE-12925] - Use acl cache for doing access control checks in prepare and clean phases of Bulkloading.
* [HBASE-12942] - After disabling the hfile block cache, Regionserver UI is throwing java.lang.NullPointerException
* [HBASE-12956] - Binding to 0.0.0.0 is broken after HBASE-10569
* [HBASE-12958] - SSH doing hbase:meta get but hbase:meta not assigned
* [HBASE-12962] - TestHFileBlockIndex.testBlockIndex() commented out during HBASE-10531
* [HBASE-12966] - NPE in HMaster while recovering tables in Enabling state
* [HBASE-12971] - Replication stuck due to large default value for replication.source.maxretriesmultiplier
* [HBASE-12976] - Set default value for hbase.client.scanner.max.result.size
* [HBASE-12978] - Region goes permanently offline (WAS: hbase:meta has a row missing hregioninfo and it causes my long-running job to fail)
* [HBASE-12984] - SSL cannot be used by the InfoPort after removing deprecated code in HBASE-10336
* [HBASE-12985] - Javadoc warning and findbugs fixes to get us green again
* [HBASE-12989] - region_mover.rb unloadRegions method uses ArrayList concurrently resulting in errors
* [HBASE-12991] - Use HBase 1.0 interfaces in hbase-rest
* [HBASE-12996] - Reversed field on Filter should be transient
* [HBASE-12998] - Compilation with Hdfs-2.7.0-SNAPSHOT is broken after HDFS-7647
* [HBASE-13003] - Get tests in TestHFileBlockIndex back
* [HBASE-13009] - HBase REST UI inaccessible
* [HBASE-13010] - HFileOutputFormat2 partitioner's path is hard-coded as '/tmp'
* [HBASE-13026] - Wrong error message in case incorrect snapshot name OR Incorrect table name
* [HBASE-13027] - mapreduce.TableInputFormatBase should create its own Connection if needed
* [HBASE-13028] - Cleanup mapreduce API changes
* [HBASE-13030] - [1.0.0 polish] Make ScanMetrics public again and align Put 'add' with Get, Delete, etc., addColumn
* [HBASE-13037] - LoadIncrementalHFile should try to verify the content of unmatched families
* [HBASE-13038] - Fix the java doc warning continuously reported by Hadoop QA
* [HBASE-13039] - Add patchprocess/* to .gitignore to fix builds of branches
** Improvement
* [HBASE-5699] - Run with > 1 WAL in HRegionServer
* [HBASE-11195] - Potentially improve block locality during major compaction for old regions
* [HBASE-11412] - Minimize a number of hbase-client transitive dependencies
* [HBASE-11639] - [Visibility controller] Replicate the visibility of Cells as strings
* [HBASE-12071] - Separate out thread pool for Master <-> RegionServer communication
* [HBASE-12121] - maven release plugin does not allow for customized goals
* [HBASE-12204] - Backport HBASE-12016 'Reduce number of versions in Meta table. Make it configurable' to branch-1
* [HBASE-12373] - Provide a command to list visibility labels
* [HBASE-12583] - Allow creating reference files even the split row not lies in the storefile range if required
* [HBASE-12597] - Add RpcClient interface and enable changing of RpcClient implementation
* [HBASE-12608] - region_mover.rb does not log moving region count correctly when loading regions
* [HBASE-12630] - Provide capability for dropping malfunctioning ConfigurationObserver automatically
* [HBASE-12640] - Add Thrift-over-HTTPS and doAs support for Thrift Server
* [HBASE-12641] - Grant all permissions of hbase zookeeper node to hbase superuser in a secure cluster
* [HBASE-12651] - Backport HBASE-12559 'Provide LoadBalancer with online configuration capability' to branch-1
* [HBASE-12653] - Move TestRegionServerOnlineConfigChange & TestConfigurationManager to Junit4 tests
* [HBASE-12659] - Replace the method calls to grant and revoke in shell scripts with AccessControlClient
* [HBASE-12668] - Adapt PayloadCarryingRpcController so it can also be used in async way
* [HBASE-12676] - Fix the misleading ASCII art in IntegrationTestBigLinkedList
* [HBASE-12678] - HBCK should print command line arguments
* [HBASE-12680] - Refactor base ClusterManager in HBase to not have the notion of sending a signal.
* [HBASE-12719] - Add test WAL provider to quantify FSHLog overhead in the absence of HDFS.
* [HBASE-12720] - Make InternalScan LimitedPrivate
* [HBASE-12736] - Let MetaScanner recycle a given Connection
* [HBASE-12745] - Visibility Labels: support visibility labels for user groups.
* [HBASE-12762] - Region with no hfiles will have the highest locality cost in LocalityCostFunction
* [HBASE-12768] - Support enable cache_data_on_write in Shell while creating table
* [HBASE-12773] - Add warning message when user is trying to bulkload a large HFile.
* [HBASE-12825] - CallRunner exception messages should include destination host:port
* [HBASE-12893] - IntegrationTestBigLinkedListWithVisibility should use buffered writes
* [HBASE-12899] - HBase should prefix htrace configuration keys with "hbase.htrace" rather than just "hbase."
* [HBASE-12929] - TableMapReduceUtil.initTableMapperJob unnecessarily limits the types of outputKeyClass and outputValueClass
* [HBASE-12973] - RegionCoprocessorEnvironment should provide HRegionInfo directly
* [HBASE-12979] - Use setters instead of return values for handing back statistics from HRegion methods
* [HBASE-12997] - FSHLog should print pipeline on low replication
* [HBASE-13008] - Better default for hbase.regionserver.regionSplitLimit parameter.
** New Feature
* [HBASE-9531] - a command line (hbase shell) interface to retreive the replication metrics and show replication lag
* [HBASE-10560] - Per cell TTLs
* [HBASE-12709] - [mvn] Add unit test excludes command line flag to the build.
* [HBASE-12731] - Heap occupancy based client pushback
** Task
* [HBASE-12493] - User class should provide a way to re-use existing token
* [HBASE-12567] - Track remaining issues for HBase-1.0
* [HBASE-12624] - Remove rename_snapshot.rb from code as there is no equivalent renameSnapshot api in Admin class
* [HBASE-12625] - Deprecate certain methods in classes annotated with InterfaceAudience.Public in branch-1
* [HBASE-12689] - Move version on from 0.99.2 to HBASE-1.0.0-SNAPSHOT
* [HBASE-12724] - Upgrade the interface audience of RegionScanner from Private to LimitedPrivate
* [HBASE-12726] - Backport to branch-1.0 addendum for "Minimize a number of hbase-client transitive dependencies"
* [HBASE-12788] - Promote Abortable to LimitedPrivate
* [HBASE-12834] - Promote ScanType to LimitedPrivate
** Test
* [HBASE-12163] - Move test annotation classes to the same package as in master
* [HBASE-12645] - HBaseTestingUtility is using ${$HOME} for rootDir
* [HBASE-12685] - TestSplitLogManager#testLogFilesAreArchived sometimes times out due to race condition
* [HBASE-12799] - ITAG fails with java.lang.RuntimeException if table does not exist
* [HBASE-12885] - Unit test for RAW / VERSIONS scanner specifications
Release Notes - HBase - Version 0.99.2 12/07/2014
** Sub-task
* [HBASE-10671] - Add missing InterfaceAudience annotations for classes in hbase-common and hbase-client modules
* [HBASE-11164] - Document and test rolling updates from 0.98 -> 1.0
* [HBASE-11915] - Document and test 0.94 -> 1.0.0 update
* [HBASE-11964] - Improve spreading replication load from failed regionservers
* [HBASE-12075] - Preemptive Fast Fail
* [HBASE-12128] - Cache configuration and RpcController selection for Table in Connection
* [HBASE-12147] - Porting Online Config Change from 89-fb
* [HBASE-12202] - Support DirectByteBuffer usage in HFileBlock
* [HBASE-12214] - Visibility Controller in the peer cluster should be able to extract visibility tags from the replicated cells
* [HBASE-12288] - Support DirectByteBuffer usage in DataBlock Encoding area
* [HBASE-12297] - Support DBB usage in Bloom and HFileIndex area
* [HBASE-12313] - Redo the hfile index length optimization so cell-based rather than serialized KV key
* [HBASE-12353] - Turn down logging on some spewing unit tests
* [HBASE-12354] - Update dependencies in time for 1.0 release
* [HBASE-12355] - Update maven plugins
* [HBASE-12363] - Improve how KEEP_DELETED_CELLS works with MIN_VERSIONS
* [HBASE-12379] - Try surefire 2.18-SNAPSHOT
* [HBASE-12400] - Fix refguide so it does connection#getTable rather than new HTable everywhere: first cut!
* [HBASE-12404] - Task 5 from parent: Replace internal HTable constructor use with HConnection#getTable (0.98, 0.99)
* [HBASE-12471] - Task 4. replace internal ConnectionManager#{delete,get}Connection use with #close, #createConnection (0.98, 0.99) under src/main/java
* [HBASE-12517] - Several HConstant members are assignable
* [HBASE-12518] - Task 4 polish. Remove CM#{get,delete}Connection
* [HBASE-12519] - Remove tabs used as whitespace
* [HBASE-12526] - Remove unused imports
* [HBASE-12577] - Disable distributed log replay by default
** Bug
* [HBASE-7211] - Improve hbase ref guide for the testing part.
* [HBASE-9003] - TableMapReduceUtil should not rely on org.apache.hadoop.util.JarFinder#getJar
* [HBASE-9117] - Remove HTablePool and all HConnection pooling related APIs
* [HBASE-9157] - ZKUtil.blockUntilAvailable loops forever with non-recoverable errors
* [HBASE-9527] - Review all old api that takes a table name as a byte array and ensure none can pass ns + tablename
* [HBASE-10536] - ImportTsv should fail fast if any of the column family passed to the job is not present in the table
* [HBASE-10780] - HFilePrettyPrinter#processFile should return immediately if file does not exist
* [HBASE-11099] - Two situations where we could open a region with smaller sequence number
* [HBASE-11562] - CopyTable should provide an option to shuffle the mapper tasks
* [HBASE-11835] - Wrong managenement of non expected calls in the client
* [HBASE-12017] - Use Connection.createTable() instead of HTable constructors.
* [HBASE-12029] - Use Table and RegionLocator in HTable.getRegionLocations()
* [HBASE-12053] - SecurityBulkLoadEndPoint set 777 permission on input data files
* [HBASE-12072] - Standardize retry handling for master operations
* [HBASE-12083] - Deprecate new HBaseAdmin() in favor of Connection.getAdmin()
* [HBASE-12142] - Truncate command does not preserve ACLs table
* [HBASE-12194] - Make TestEncodedSeekers faster
* [HBASE-12219] - Cache more efficiently getAll() and get() in FSTableDescriptors
* [HBASE-12226] - TestAccessController#testPermissionList failing on master
* [HBASE-12229] - NullPointerException in SnapshotTestingUtils
* [HBASE-12234] - Make TestMultithreadedTableMapper a little more stable.
* [HBASE-12237] - HBaseZeroCopyByteString#wrap() should not be called in hbase-client code
* [HBASE-12238] - A few ugly exceptions on startup
* [HBASE-12240] - hbase-daemon.sh should remove pid file if process not found running
* [HBASE-12241] - The crash of regionServer when taking deadserver's replication queue breaks replication
* [HBASE-12242] - Fix new javadoc warnings in Admin, etc.
* [HBASE-12246] - Compilation with hadoop-2.3.x and 2.2.x is broken
* [HBASE-12247] - Replace setHTable() with initializeTable() in TableInputFormat.
* [HBASE-12248] - broken link in hbase shell help
* [HBASE-12252] - IntegrationTestBulkLoad fails with illegal partition error
* [HBASE-12257] - TestAssignmentManager unsynchronized access to regionPlans
* [HBASE-12258] - Make TestHBaseFsck less flaky
* [HBASE-12261] - Add checkstyle to HBase build process
* [HBASE-12263] - RegionServer listens on localhost in distributed cluster when DNS is unavailable
* [HBASE-12265] - HBase shell 'show_filters' points to internal Facebook URL
* [HBASE-12274] - Race between RegionScannerImpl#nextInternal() and RegionScannerImpl#close() may produce null pointer exception
* [HBASE-12277] - Refactor bulkLoad methods in AccessController to its own interface
* [HBASE-12278] - Race condition in TestSecureLoadIncrementalHFilesSplitRecovery
* [HBASE-12279] - Generated thrift files were generated with the wrong parameters
* [HBASE-12281] - ClonedPrefixTreeCell should implement HeapSize
* [HBASE-12285] - Builds are failing, possibly because of SUREFIRE-1091
* [HBASE-12294] - Can't build the docs after the hbase-checkstyle module was added
* [HBASE-12301] - user_permission command does not show global permissions
* [HBASE-12302] - VisibilityClient getAuths does not propagate remote service exception correctly
* [HBASE-12304] - CellCounter will throw AIOBE when output directory is not specified
* [HBASE-12306] - CellCounter output's wrong value for Total Families Across all Rows in output file
* [HBASE-12308] - Fix typo in hbase-rest profile name
* [HBASE-12312] - Another couple of createTable race conditions
* [HBASE-12314] - Add chaos monkey policy to execute two actions concurrently
* [HBASE-12315] - Fix 0.98 Tests after checkstyle got parented
* [HBASE-12316] - test-patch.sh (Hadoop-QA) outputs the wrong release audit warnings URL
* [HBASE-12318] - Add license header to checkstyle xml files
* [HBASE-12319] - Inconsistencies during region recovery due to close/open of a region during recovery
* [HBASE-12322] - Add clean up command to ITBLL
* [HBASE-12327] - MetricsHBaseServerSourceFactory#createContextName has wrong conditions
* [HBASE-12329] - Table create with duplicate column family names quietly succeeds
* [HBASE-12334] - Handling of DeserializationException causes needless retry on failure
* [HBASE-12336] - RegionServer failed to shutdown for NodeFailoverWorker thread
* [HBASE-12337] - Import tool fails with NullPointerException if clusterIds is not initialized
* [HBASE-12346] - Scan's default auths behavior under Visibility labels
* [HBASE-12352] - Add hbase-annotation-tests to runtime classpath so can run hbase it tests.
* [HBASE-12356] - Rpc with region replica does not propagate tracing spans
* [HBASE-12359] - MulticastPublisher should specify IPv4/v6 protocol family when creating multicast channel
* [HBASE-12366] - Add login code to HBase Canary tool.
* [HBASE-12372] - [WINDOWS] Enable log4j configuration in hbase.cmd
* [HBASE-12375] - LoadIncrementalHFiles fails to load data in table when CF name starts with '_'
* [HBASE-12377] - HBaseAdmin#deleteTable fails when META region is moved around the same timeframe
* [HBASE-12384] - TestTags can hang on fast test hosts
* [HBASE-12386] - Replication gets stuck following a transient zookeeper error to remote peer cluster
* [HBASE-12398] - Region isn't assigned in an extreme race condition
* [HBASE-12399] - Master startup race between metrics and RpcServer
* [HBASE-12402] - ZKPermissionWatcher race condition in refreshing the cache leaving stale ACLs and causing AccessDenied
* [HBASE-12407] - HConnectionKey doesn't contain CUSTOM_CONTROLLER_CONF_KEY in CONNECTION_PROPERTIES
* [HBASE-12414] - Move HFileLink.exists() to base class
* [HBASE-12417] - Scan copy constructor does not retain small attribute
* [HBASE-12419] - "Partial cell read caused by EOF" ERRORs on replication source during replication
* [HBASE-12420] - BucketCache logged startup message is egregiously large
* [HBASE-12423] - Use a non-managed Table in TableOutputFormat
* [HBASE-12428] - region_mover.rb script is broken if port is not specified
* [HBASE-12440] - Region may remain offline on clean startup under certain race condition
* [HBASE-12445] - hbase is removing all remaining cells immediately after the cell marked with marker = KeyValue.Type.DeleteColumn via PUT
* [HBASE-12448] - Fix rate reporting in compaction progress DEBUG logging
* [HBASE-12449] - Use the max timestamp of current or old cell's timestamp in HRegion.append()
* [HBASE-12450] - Unbalance chaos monkey might kill all region servers without starting them back
* [HBASE-12459] - Use a non-managed Table in mapred.TableOutputFormat
* [HBASE-12460] - Moving Chore to hbase-common module.
* [HBASE-12461] - FSVisitor logging is excessive
* [HBASE-12464] - meta table region assignment stuck in the FAILED_OPEN state due to region server not fully ready to serve
* [HBASE-12478] - HBASE-10141 and MIN_VERSIONS are not compatible
* [HBASE-12479] - Backport HBASE-11689 (Track meta in transition) to 0.98 and branch-1
* [HBASE-12490] - Replace uses of setAutoFlush(boolean, boolean)
* [HBASE-12491] - TableMapReduceUtil.findContainingJar() NPE
* [HBASE-12495] - Use interfaces in the shell scripts
* [HBASE-12513] - Graceful stop script does not restore the balancer state
* [HBASE-12514] - Cleanup HFileOutputFormat legacy code
* [HBASE-12520] - Add protected getters on TableInputFormatBase
* [HBASE-12533] - staging directories are not deleted after secure bulk load
* [HBASE-12536] - Reduce the effective scope of GLOBAL CREATE and ADMIN permission
* [HBASE-12537] - HBase should log the remote host on replication error
* [HBASE-12539] - HFileLinkCleaner logs are uselessly noisy
* [HBASE-12541] - Add misc debug logging to hanging tests in TestHCM and TestBaseLoadBalancer
* [HBASE-12544] - ops_mgt.xml missing in branch-1
* [HBASE-12550] - Check all storefiles are referenced before splitting
* [HBASE-12560] - [WINDOWS] Append the classpath from Hadoop to HBase classpath in bin/hbase.cmd
* [HBASE-12576] - Add metrics for rolling the HLog if there are too few DN's in the write pipeline
* [HBASE-12580] - Zookeeper instantiated even though we might not need it in the shell
* [HBASE-12581] - TestCellACLWithMultipleVersions failing since task 5 HBASE-12404 (HBASE-12404 addendum)
* [HBASE-12584] - Fix branch-1 failing since task 5 HBASE-12404 (HBASE-12404 addendum)
* [HBASE-12595] - Use Connection.getTable() in table.rb
* [HBASE-12600] - Remove REPLAY tag dependency in Distributed Replay Mode
* [HBASE-12610] - Close connection in TableInputFormatBase
* [HBASE-12611] - Create autoCommit() method and remove clearBufferOnFail
* [HBASE-12614] - Potentially unclosed StoreFile(s) in DefaultCompactor#compact()
* [HBASE-12616] - We lost the IntegrationTestBigLinkedList COMMANDS in recent usage refactoring
** Improvement
* [HBASE-2609] - Harmonize the Get and Delete operations
* [HBASE-4955] - Use the official versions of surefire & junit
* [HBASE-8361] - Bulk load and other utilities should not create tables for user
* [HBASE-8572] - Enhance delete_snapshot.rb to call snapshot deletion API with regex
* [HBASE-10082] - Describe 'table' output is all on one line, could use better formatting
* [HBASE-10483] - Provide API for retrieving info port when hbase.master.info.port is set to 0
* [HBASE-11639] - [Visibility controller] Replicate the visibility of Cells as strings
* [HBASE-11870] - Optimization : Avoid copy of key and value for tags addition in AC and VC
* [HBASE-12161] - Add support for grant/revoke on namespaces in AccessControlClient
* [HBASE-12243] - HBaseFsck should auto set ignorePreCheckPermission to true if no fix option is set.
* [HBASE-12249] - Script to help you adhere to the patch-naming guidelines
* [HBASE-12264] - ImportTsv should fail fast if output is not specified and table does not exist
* [HBASE-12271] - Add counters for files skipped during snapshot export
* [HBASE-12272] - Generate Thrift code through maven
* [HBASE-12328] - Need to separate JvmMetrics for Master and RegionServer
* [HBASE-12389] - Reduce the number of versions configured for the ACL table
* [HBASE-12390] - Change revision style from svn to git
* [HBASE-12411] - Optionally enable p-reads and private readers for compactions
* [HBASE-12416] - RegionServerCallable should report what host it was communicating with
* [HBASE-12424] - Finer grained logging and metrics for split transactions
* [HBASE-12432] - RpcRetryingCaller should log after fixed number of retries like AsyncProcess
* [HBASE-12434] - Add a command to compact all the regions in a regionserver
* [HBASE-12447] - Add support for setTimeRange for RowCounter and CellCounter
* [HBASE-12455] - Add 'description' to bean and attribute output when you do /jmx?description=true
* [HBASE-12529] - Use ThreadLocalRandom for RandomQueueBalancer
* [HBASE-12569] - Control MaxDirectMemorySize in the same manner as heap size
** New Feature
* [HBASE-8707] - Add LongComparator for filter
* [HBASE-12286] - [shell] Add server/cluster online load of configuration changes
* [HBASE-12361] - Show data locality of region in table page
* [HBASE-12496] - A blockedRequestsCount metric
** Task
* [HBASE-10200] - Better error message when HttpServer fails to start due to java.net.BindException
* [HBASE-10870] - Deprecate and replace HCD methods that have a 'should' prefix with a 'get' instead
* [HBASE-12250] - Adding an endpoint for updating the regionserver config
* [HBASE-12344] - Split up TestAdmin
* [HBASE-12381] - Add maven enforcer rules for build assumptions
* [HBASE-12388] - Document that WALObservers don't get empty edits.
* [HBASE-12427] - Change branch-1 version from 0.99.2-SNAPSHOT to 0.99.3-SNAPSHOT
* [HBASE-12442] - Bring KeyValue#createFirstOnRow() back to branch-1 as deprecated methods
* [HBASE-12456] - Update surefire from 2.18-SNAPSHOT to 2.18
* [HBASE-12516] - Clean up master so QA Bot is in known good state
* [HBASE-12522] - Backport WAL refactoring to branch-1
** Test
* [HBASE-12317] - Run IntegrationTestRegionReplicaPerf w.o mapred
* [HBASE-12335] - IntegrationTestRegionReplicaPerf is flaky
* [HBASE-12367] - Integration tests should not restore the cluster if the CM is not destructive
* [HBASE-12378] - Add a test to verify that the read-replica is able to read after a compaction
* [HBASE-12401] - Add some timestamp signposts in IntegrationTestMTTR
* [HBASE-12403] - IntegrationTestMTTR flaky due to aggressive RS restart timeout
* [HBASE-12472] - Improve debuggability of IntegrationTestBulkLoad
* [HBASE-12549] - Fix TestAssignmentManagerOnCluster#testAssignRacingWithSSH() flaky test
* [HBASE-12554] - TestBaseLoadBalancer may timeout due to lengthy rack lookup
** Umbrella
* [HBASE-10602] - Cleanup HTable public interface
* [HBASE-10856] - Prep for 1.0
Release Notes - HBase - Version 0.99.1 10/15/2014
** Sub-task
* [HBASE-11160] - Undo append waiting on region edit/sequence id update
* [HBASE-11178] - Remove deprecation annotations from mapred namespace
* [HBASE-11738] - Document improvements to LoadTestTool and PerformanceEvaluation
* [HBASE-11872] - Avoid usage of KeyValueUtil#ensureKeyValue from Compactor
* [HBASE-11874] - Support Cell to be passed to StoreFile.Writer rather than KeyValue
* [HBASE-11917] - Deprecate / Remove HTableUtil
* [HBASE-11920] - Add CP hooks for ReplicationEndPoint
* [HBASE-11930] - Document new permission check to roll WAL writer
* [HBASE-11980] - Change sync to hsync, remove unused InfoServer, and reference our httpserver instead of hadoops
* [HBASE-11997] - CopyTable with bulkload
* [HBASE-12023] - HRegion.applyFamilyMapToMemstore creates too many iterator objects.
* [HBASE-12046] - HTD/HCD setters should be builder-style
* [HBASE-12047] - Avoid usage of KeyValueUtil#ensureKeyValue in simple cases
* [HBASE-12050] - Avoid KeyValueUtil#ensureKeyValue from DefaultMemStore
* [HBASE-12051] - Avoid KeyValueUtil#ensureKeyValue from DefaultMemStore
* [HBASE-12059] - Create hbase-annotations module
* [HBASE-12062] - Fix usage of Collections.toArray
* [HBASE-12068] - [Branch-1] Avoid need to always do KeyValueUtil#ensureKeyValue for Filter transformCell
* [HBASE-12069] - Finish making HFile.Writer Cell-centric; undo APIs that expect KV serializations.
* [HBASE-12076] - Move InterfaceAudience imports to hbase-annotations
* [HBASE-12077] - FilterLists create many ArrayList$Itr objects per row.
* [HBASE-12079] - Deprecate KeyValueUtil#ensureKeyValue(s)
* [HBASE-12082] - Find a way to set timestamp on Cells on the server
* [HBASE-12086] - Fix bugs in HTableMultiplexer
* [HBASE-12096] - In ZKSplitLog Coordination and AggregateImplementation replace enhaced for statements with basic for statement to avoid unnecessary object allocation
* [HBASE-12104] - Some optimization and bugfix for HTableMultiplexer
* [HBASE-12110] - Fix .arcconfig
* [HBASE-12112] - Avoid KeyValueUtil#ensureKeyValue some more simple cases
* [HBASE-12115] - Fix NumberFormat Exception in TableInputFormatBase.
* [HBASE-12189] - Fix new issues found by coverity static analysis
* [HBASE-12210] - Avoid KeyValue in Prefix Tree
** Bug
* [HBASE-6994] - minor doc update about DEFAULT_ACCEPTABLE_FACTOR
* [HBASE-8808] - Use Jacoco to generate Unit Test coverage reports
* [HBASE-8936] - Fixing TestSplitLogWorker while running Jacoco tests.
* [HBASE-9005] - Improve documentation around KEEP_DELETED_CELLS, time range scans, and delete markers
* [HBASE-9513] - Why is PE#RandomSeekScanTest way slower in 0.96 than in 0.94?
* [HBASE-10314] - Add Chaos Monkey that doesn't touch the master
* [HBASE-10748] - hbase-daemon.sh fails to execute with 'sh' command
* [HBASE-10757] - Change HTable class doc so it sends people to HCM getting instances
* [HBASE-11145] - UNEXPECTED!!! when HLog sync: Queue full
* [HBASE-11266] - Remove shaded references to logger
* [HBASE-11394] - Replication can have data loss if peer id contains hyphen "-"
* [HBASE-11401] - Late-binding sequenceid presumes a particular KeyValue mvcc format hampering experiment
* [HBASE-11405] - Multiple invocations of hbck in parallel disables balancer permanently
* [HBASE-11804] - Raise default heap size if unspecified
* [HBASE-11815] - Flush and compaction could just close the tmp writer if there is an exception
* [HBASE-11890] - HBase REST Client is hard coded to http protocol
* [HBASE-11906] - Meta data loss with distributed log replay
* [HBASE-11967] - HMaster in standalone won't go down if it gets 'Unhandled exception'
* [HBASE-11974] - When a disabled table is scanned, NotServingRegionException is thrown instead of TableNotEnabledException
* [HBASE-11982] - Bootstraping hbase:meta table creates a WAL file in region dir
* [HBASE-11988] - AC/VC system table create on postStartMaster fails too often in test
* [HBASE-11991] - Region states may be out of sync
* [HBASE-11994] - PutCombiner floods the M/R log with repeated log messages.
* [HBASE-12007] - StochasticBalancer should avoid putting user regions on master
* [HBASE-12019] - hbase-daemon.sh overwrite HBASE_ROOT_LOGGER and HBASE_SECURITY_LOGGER variables
* [HBASE-12024] - Fix javadoc warning
* [HBASE-12025] - TestHttpServerLifecycle.testStartedServerWithRequestLog hangs frequently
* [HBASE-12034] - If I kill single RS in branch-1, all regions end up on Master!
* [HBASE-12038] - Replace internal uses of signatures with byte[] and String tableNames to use the TableName equivalents.
* [HBASE-12041] - AssertionError in HFilePerformanceEvaluation.UniformRandomReadBenchmark
* [HBASE-12042] - Replace internal uses of HTable(Configuration, String) with HTable(Configuration, TableName)
* [HBASE-12043] - REST server should respond with FORBIDDEN(403) code on AccessDeniedException
* [HBASE-12044] - REST delete operation should not retry disableTable for DoNotRetryIOException
* [HBASE-12045] - REST proxy users configuration in hbase-site.xml is ignored
* [HBASE-12052] - BulkLoad Failed due to no write permission on input files
* [HBASE-12054] - bad state after NamespaceUpgrade with reserved table names
* [HBASE-12056] - RPC logging too much in DEBUG mode
* [HBASE-12064] - hbase.master.balancer.stochastic.numRegionLoadsToRemember is not used
* [HBASE-12065] - Import tool is not restoring multiple DeleteFamily markers of a row
* [HBASE-12067] - Remove deprecated metrics classes.
* [HBASE-12078] - Missing Data when scanning using PREFIX_TREE DATA-BLOCK-ENCODING
* [HBASE-12095] - SecureWALCellCodec should handle the case where encryption is disabled
* [HBASE-12098] - User granted namespace table create permissions can't create a table
* [HBASE-12099] - TestScannerModel fails if using jackson 1.9.13
* [HBASE-12106] - Move test annotations to test artifact
* [HBASE-12109] - user_permission command for namespace does not return correct result
* [HBASE-12119] - Master regionserver web UI NOT_FOUND
* [HBASE-12120] - HBase shell doesn't allow deleting of a cell by user with W-only permissions to it
* [HBASE-12122] - Try not to assign user regions to master all the time
* [HBASE-12123] - Failed assertion in BucketCache after 11331
* [HBASE-12124] - Closed region could stay closed if master stops at bad time
* [HBASE-12126] - Region server coprocessor endpoint
* [HBASE-12130] - HBASE-11980 calls hflush and hsync doing near double the syncing work
* [HBASE-12134] - publish_website.sh script is too optimistic
* [HBASE-12135] - Website is broken
* [HBASE-12136] - Race condition between client adding tableCF replication znode and server triggering TableCFsTracker
* [HBASE-12137] - Alter table add cf doesn't do compression test
* [HBASE-12139] - StochasticLoadBalancer doesn't work on large lightly loaded clusters
* [HBASE-12140] - Add ConnectionFactory.createConnection() to create using default HBaseConfiguration.
* [HBASE-12145] - Fix javadoc and findbugs so new folks aren't freaked when they see them
* [HBASE-12146] - RegionServerTracker should escape data in log messages
* [HBASE-12149] - TestRegionPlacement is failing undeterministically
* [HBASE-12151] - Make dev scripts executable
* [HBASE-12153] - Fixing TestReplicaWithCluster
* [HBASE-12156] - TableName cache isn't used for one of valueOf methods.
* [HBASE-12158] - TestHttpServerLifecycle.testStartedServerWithRequestLog goes zombie on occasion
* [HBASE-12160] - Make Surefire's argLine configurable in the command line
* [HBASE-12164] - Check for presence of user Id in SecureBulkLoadEndpoint#secureBulkLoadHFiles() is inaccurate
* [HBASE-12165] - TestEndToEndSplitTransaction.testFromClientSideWhileSplitting fails
* [HBASE-12166] - TestDistributedLogSplitting.testMasterStartsUpWithLogReplayWork
* [HBASE-12167] - NPE in AssignmentManager
* [HBASE-12170] - TestReplicaWithCluster.testReplicaAndReplication timeouts
* [HBASE-12181] - Some tests create a table and try to use it before regions get assigned
* [HBASE-12183] - FuzzyRowFilter doesn't support reverse scans
* [HBASE-12184] - ServerShutdownHandler throws NPE
* [HBASE-12191] - Make TestCacheOnWrite faster.
* [HBASE-12196] - SSH should retry in case failed to assign regions
* [HBASE-12197] - Move REST
* [HBASE-12198] - Fix the bug of not updating location cache
* [HBASE-12199] - Make TestAtomicOperation and TestEncodedSeekers faster
* [HBASE-12200] - When an RPC server handler thread dies, throw exception
* [HBASE-12206] - NPE in RSRpcServices
* [HBASE-12209] - NPE in HRegionServer#getLastSequenceId
* [HBASE-12218] - Make HBaseCommonTestingUtil#deleteDir try harder
** Improvement
* [HBASE-10153] - improve VerifyReplication to compute BADROWS more accurately
* [HBASE-10411] - [Book] Add a kerberos 'request is a replay (34)' issue at troubleshooting section
* [HBASE-11796] - Add client support for atomic checkAndMutate
* [HBASE-11879] - Change TableInputFormatBase to take interface arguments
* [HBASE-11907] - Use the joni byte[] regex engine in place of j.u.regex in RegexStringComparator
* [HBASE-11948] - graceful_stop.sh should use hbase-daemon.sh when executed on the decomissioned node
* [HBASE-12010] - Use TableName.META_TABLE_NAME instead of indirectly from HTableDescriptor
* [HBASE-12011] - Add namespace column during display of user tables
* [HBASE-12013] - Make region_mover.rb support multiple regionservers per host
* [HBASE-12021] - Hbase shell does not respect the HBASE_OPTS set by the user in console
* [HBASE-12032] - Script to stop regionservers via RPC
* [HBASE-12049] - Help for alter command is a bit confusing
* [HBASE-12090] - Bytes: more Unsafe, more Faster
* [HBASE-12118] - Explain how to grant permission to a namespace in grant command usage
* [HBASE-12176] - WALCellCodec Encoders support for non-KeyValue Cells
* [HBASE-12212] - HBaseTestingUtility#waitUntilAllRegionsAssigned should wait for RegionStates
* [HBASE-12220] - Add hedgedReads and hedgedReadWins metrics
** New Feature
* [HBASE-11990] - Make setting the start and stop row for a specific prefix easier
* [HBASE-11995] - Use Connection and ConnectionFactory where possible
* [HBASE-12127] - Move the core Connection creation functionality into ConnectionFactory
* [HBASE-12133] - Add FastLongHistogram for metric computation
* [HBASE-12143] - Minor fix for Table code
** Task
* [HBASE-9004] - Fix Documentation around Minor compaction and ttl
* [HBASE-11692] - Document how and why to do a manual region split
* [HBASE-11730] - Document release managers for non-deprecated branches
* [HBASE-11761] - Add a FAQ item for updating a maven-managed application from 0.94 -> 0.96+
* [HBASE-11960] - Provide a sample to show how to use Thrift client authentication
* [HBASE-11978] - Backport 'HBASE-7767 Get rid of ZKTable, and table enable/disable state in ZK' to 1.0
* [HBASE-11981] - Document how to find the units of measure for a given HBase metric
** Test
* [HBASE-11798] - TestBucketWriterThread may hang due to WriterThread stopping prematurely
* [HBASE-11838] - Enable PREFIX_TREE in integration tests
* [HBASE-12008] - Remove IntegrationTestImportTsv#testRunFromOutputCommitter
* [HBASE-12055] - TestBucketWriterThread hangs flakily based on timing
Release Notes - HBase - Version 0.99.0 9/22/2014
** Sub-task
* [HBASE-2251] - PE defaults to 1k rows - uncommon use case, and easy to hit benchmarks
* [HBASE-5175] - Add DoubleColumnInterpreter
* [HBASE-6873] - Clean up Coprocessor loading failure handling
* [HBASE-8541] - implement flush-into-stripes in stripe compactions
* [HBASE-9149] - javadoc cleanup of to reflect .META. rename to hbase:meta
* [HBASE-9261] - Add cp hooks after {start|close}RegionOperation
* [HBASE-9489] - Add cp hooks in online merge before and after setting PONR
* [HBASE-9846] - Integration test and LoadTestTool support for cell ACLs
* [HBASE-9858] - Integration test and LoadTestTool support for cell Visibility
* [HBASE-9889] - Make sure we clean up scannerReadPoints upon any exceptions
* [HBASE-9941] - The context ClassLoader isn't set while calling into a coprocessor
* [HBASE-9966] - Create IntegrationTest for Online Bloom Filter Change
* [HBASE-9977] - Define C interface of HBase Client Asynchronous APIs
* [HBASE-10043] - Fix Potential Resouce Leak in MultiTableInputFormatBase
* [HBASE-10094] - Add batching to HLogPerformanceEvaluation
* [HBASE-10110] - Fix Potential Resource Leak in StoreFlusher
* [HBASE-10124] - Make Sub Classes Static When Possible
* [HBASE-10143] - Clean up dead local stores in FSUtils
* [HBASE-10150] - Write attachment Id of tested patch into JIRA comment
* [HBASE-10156] - FSHLog Refactor (WAS -> Fix up the HBASE-8755 slowdown when low contention)
* [HBASE-10158] - Add sync rate histogram to HLogPE
* [HBASE-10169] - Batch coprocessor
* [HBASE-10297] - LoadAndVerify Integration Test for cell visibility
* [HBASE-10347] - HRegionInfo changes for adding replicaId and MetaEditor/MetaReader changes for region replicas
* [HBASE-10348] - HTableDescriptor changes for region replicas
* [HBASE-10350] - Master/AM/RegionStates changes to create and assign region replicas
* [HBASE-10351] - LoadBalancer changes for supporting region replicas
* [HBASE-10352] - Region and RegionServer changes for opening region replicas, and refreshing store files
* [HBASE-10354] - Add an API for defining consistency per request
* [HBASE-10355] - Failover RPC's from client using region replicas
* [HBASE-10356] - Failover RPC's for multi-get
* [HBASE-10357] - Failover RPC's for scans
* [HBASE-10359] - Master/RS WebUI changes for region replicas
* [HBASE-10361] - Enable/AlterTable support for region replicas
* [HBASE-10362] - HBCK changes for supporting region replicas
* [HBASE-10391] - Deprecate KeyValue#getBuffer
* [HBASE-10420] - Replace KV.getBuffer with KV.get{Row|Family|Qualifier|Value|Tags}Array
* [HBASE-10513] - Provide user documentation for region replicas
* [HBASE-10517] - NPE in MetaCache.clearCache()
* [HBASE-10519] - Add handling for swallowed InterruptedException thrown by Thread.sleep in rest related files
* [HBASE-10520] - Add handling for swallowed InterruptedException thrown by Thread.sleep in MiniZooKeeperCluster
* [HBASE-10521] - Add handling for swallowed InterruptedException thrown by Thread.sleep in RpcServer
* [HBASE-10522] - Correct wrong handling and add proper handling for swallowed InterruptedException thrown by Thread.sleep in client
* [HBASE-10523] - Correct wrong handling and add proper handling for swallowed InterruptedException thrown by Thread.sleep in util
* [HBASE-10524] - Correct wrong handling and add proper handling for swallowed InterruptedException thrown by Thread.sleep in regionserver
* [HBASE-10526] - Using Cell instead of KeyValue in HFileOutputFormat
* [HBASE-10529] - Make Cell extend Cloneable
* [HBASE-10530] - Add util methods in CellUtil
* [HBASE-10531] - Revisit how the key byte[] is passed to HFileScanner.seekTo and reseekTo
* [HBASE-10532] - Make KeyValueComparator in KeyValue to accept Cell instead of KeyValue.
* [HBASE-10550] - Register HBase tokens with ServiceLoader
* [HBASE-10561] - Forward port: HBASE-10212 New rpc metric: number of active handler
* [HBASE-10572] - Create an IntegrationTest for region replicas
* [HBASE-10573] - Use Netty 4
* [HBASE-10616] - Integration test for multi-get calls
* [HBASE-10620] - LoadBalancer.needsBalance() should check for co-located region replicas as well
* [HBASE-10630] - NullPointerException in ConnectionManager$HConnectionImplementation.locateRegionInMeta() due to missing region info
* [HBASE-10633] - StoreFileRefresherChore throws ConcurrentModificationException sometimes
* [HBASE-10634] - Multiget doesn't fully work
* [HBASE-10648] - Pluggable Memstore
* [HBASE-10650] - Fix incorrect handling of IE that restores current thread's interrupt status within while/for loops in RegionServer
* [HBASE-10651] - Fix incorrect handling of IE that restores current thread's interrupt status within while/for loops in Replication
* [HBASE-10652] - Fix incorrect handling of IE that restores current thread's interrupt status within while/for loops in rpc
* [HBASE-10661] - TestStochasticLoadBalancer.testRegionReplicationOnMidClusterWithRacks() is flaky
* [HBASE-10672] - Table snapshot should handle tables whose REGION_REPLICATION is greater than one
* [HBASE-10680] - Check if the block keys, index keys can be used as Cells instead of byte[]
* [HBASE-10688] - Add a draining_node script to manage nodes in draining mode
* [HBASE-10691] - test-patch.sh should continue even if compilation against hadoop 1.0 / 1.1 fails
* [HBASE-10697] - Convert TestSimpleTotalOrderPartitioner to junit4 test
* [HBASE-10701] - Cache invalidation improvements from client side
* [HBASE-10704] - BaseLoadBalancer#roundRobinAssignment() may add same region to assignment plan multiple times
* [HBASE-10717] - TestFSHDFSUtils#testIsSameHdfs fails with IllegalArgumentException running against hadoop 2.3
* [HBASE-10723] - Convert TestExplicitColumnTracker to junit4 test
* [HBASE-10729] - Enable table doesn't balance out replicas evenly if the replicas were unassigned earlier
* [HBASE-10734] - Fix RegionStates.getRegionAssignments to not add duplicate regions
* [HBASE-10741] - Deprecate HTablePool and HTableFactory
* [HBASE-10743] - Replica map update is problematic in RegionStates
* [HBASE-10750] - Pluggable MemStoreLAB
* [HBASE-10778] - Unique keys accounting in MultiThreadedReader is incorrect
* [HBASE-10779] - Doc hadoop1 deprecated in 0.98 and NOT supported in hbase 1.0
* [HBASE-10781] - Remove hadoop-one-compat module and all references to hadoop1
* [HBASE-10791] - Add integration test to demonstrate performance improvement
* [HBASE-10794] - multi-get should handle replica location missing from cache
* [HBASE-10796] - Set default log level as INFO
* [HBASE-10801] - Ensure DBE interfaces can work with Cell
* [HBASE-10810] - LoadTestTool should share the connection and connection pool
* [HBASE-10815] - Master regionserver should be rolling-upgradable
* [HBASE-10817] - Add some tests on a real cluster for replica: multi master, replication
* [HBASE-10818] - Add integration test for bulkload with replicas
* [HBASE-10822] - Thread local addendum to HBASE-10656 Counter
* [HBASE-10841] - Scan,Get,Put,Delete,etc setters should consistently return this
* [HBASE-10855] - Enable hfilev3 by default
* [HBASE-10858] - TestRegionRebalancing is failing
* [HBASE-10859] - Use HFileLink in opening region files from secondaries
* [HBASE-10888] - Enable distributed log replay as default
* [HBASE-10915] - Decouple region closing (HM and HRS) from ZK
* [HBASE-10918] - [VisibilityController] System table backed ScanLabelGenerator
* [HBASE-10929] - Change ScanQueryMatcher to use Cells instead of KeyValue.
* [HBASE-10930] - Change Filters and GetClosestRowBeforeTracker to work with Cells
* [HBASE-10957] - HBASE-10070: HMaster can abort with NPE in #rebuildUserRegions
* [HBASE-10962] - Decouple region opening (HM and HRS) from ZK
* [HBASE-10963] - Refactor cell ACL tests
* [HBASE-10972] - OOBE in prefix key encoding
* [HBASE-10985] - Decouple Split Transaction from Zookeeper
* [HBASE-10993] - Deprioritize long-running scanners
* [HBASE-11025] - Infrastructure for pluggable consensus service
* [HBASE-11027] - Remove kv.isDeleteXX() and related methods and use CellUtil apis.
* [HBASE-11053] - Change DeleteTracker APIs to work with Cell
* [HBASE-11054] - Create new hook in StoreScanner to help user creating his own delete tracker
* [HBASE-11059] - ZK-less region assignment
* [HBASE-11069] - Decouple region merging from ZooKeeper
* [HBASE-11072] - Abstract WAL splitting from ZK
* [HBASE-11077] - [AccessController] Restore compatible early-out access denial
* [HBASE-11088] - Support Visibility Expression Deletes in Shell
* [HBASE-11092] - Server interface should have method getConsensusProvider()
* [HBASE-11094] - Distributed log replay is incompatible for rolling restarts
* [HBASE-11098] - Improve documentation around our blockcache options
* [HBASE-11101] - Documentation review
* [HBASE-11102] - Document JDK versions supported by each release
* [HBASE-11108] - Split ZKTable into interface and implementation
* [HBASE-11109] - flush region sequence id may not be larger than all edits flushed
* [HBASE-11135] - Change region sequenceid generation so happens earlier in the append cycle rather than just before added to file
* [HBASE-11140] - LocalHBaseCluster should create ConsensusProvider per each server
* [HBASE-11161] - Provide example of POJO encoding with protobuf
* [HBASE-11171] - More doc improvements on block cache options
* [HBASE-11214] - Fixes for scans on a replicated table
* [HBASE-11229] - Change block cache percentage metrics to be doubles rather than ints
* [HBASE-11280] - Document distributed log replay and distributed log splitting
* [HBASE-11307] - Deprecate SlabCache
* [HBASE-11318] - Classes in security subpackages missing @InterfaceAudience annotations.
* [HBASE-11332] - Fix for metas location cache from HBASE-10785
* [HBASE-11367] - Pluggable replication endpoint
* [HBASE-11372] - Remove SlabCache
* [HBASE-11384] - [Visibility Controller]Check for users covering authorizations for every mutation
* [HBASE-11395] - Add logging for HBase table operations
* [HBASE-11471] - Move TableStateManager and ZkTableStateManager and Server to hbase-server
* [HBASE-11483] - Check the rest of the book for new XML validity errors and fix
* [HBASE-11508] - Document changes to IPC config parameters from HBASE-11492
* [HBASE-11511] - Write flush events to WAL
* [HBASE-11512] - Write region open/close events to WAL
* [HBASE-11520] - Simplify offheap cache config by removing the confusing "hbase.bucketcache.percentage.in.combinedcache"
* [HBASE-11559] - Add dumping of DATA block usage to the BlockCache JSON report.
* [HBASE-11572] - Add support for doing get/scans against a particular replica_id
* [HBASE-11573] - Report age on eviction
* [HBASE-11610] - Enhance remote meta updates
* [HBASE-11651] - Add conf which disables MetaMigrationConvertingToPB check (for experts only)
* [HBASE-11722] - Document new shortcut commands introduced by HBASE-11649
* [HBASE-11734] - Document changed behavior of hbase.hstore.time.to.purge.deletes
* [HBASE-11736] - Document SKIP_FLUSH snapshot option
* [HBASE-11737] - Document callQueue improvements from HBASE-11355 and HBASE-11724
* [HBASE-11739] - Document blockCache contents report in the UI
* [HBASE-11740] - RegionStates.getRegionAssignments() gets stuck on clone
* [HBASE-11752] - Document blockcache prefetch option
* [HBASE-11753] - Document HBASE_SHELL_OPTS environment variable
* [HBASE-11781] - Document new TableMapReduceUtil scanning options
* [HBASE-11784] - Document global configuration for maxVersion
* [HBASE-11822] - Convert EnvironmentEdge#getCurrentTimeMillis to getCurrentTime
* [HBASE-11919] - Remove the deprecated pre/postGet CP hook
* [HBASE-11923] - Potential race condition in RecoverableZookeeper.checkZk()
* [HBASE-11934] - Support KeyValueCodec to encode non KeyValue cells.
* [HBASE-11941] - Rebuild site because of major structural changes to HTML
* [HBASE-11963] - Synchronize peer cluster replication connection attempts
** Brainstorming
* [HBASE-9507] - Promote methods of WALActionsListener to WALObserver
* [HBASE-11209] - Increase the default value for hbase.hregion.memstore.block.multipler from 2 to 4
** Bug
* [HBASE-3787] - Increment is non-idempotent but client retries RPC
* [HBASE-4931] - CopyTable instructions could be improved.
* [HBASE-5356] - region_mover.rb can hang if table region it belongs to is deleted.
* [HBASE-6506] - Setting CACHE_BLOCKS to false in an hbase shell scan doesn't work
* [HBASE-6642] - enable_all,disable_all,drop_all can call "list" command with regex directly.
* [HBASE-6701] - Revisit thrust of paragraph on splitting
* [HBASE-7226] - HRegion.checkAndMutate uses incorrect comparison result for <, <=, > and >=
* [HBASE-7963] - HBase VerifyReplication not working when security enabled
* [HBASE-8112] - Deprecate HTable#batch(final List<? extends Row>)
* [HBASE-8269] - Fix data locallity documentation.
* [HBASE-8304] - Bulkload fails to remove files if fs.default.name / fs.defaultFS is configured without default port
* [HBASE-8529] - checkOpen is missing from multi, mutate, get and multiGet etc.
* [HBASE-8701] - distributedLogReplay need to apply wal edits in the receiving order of those edits
* [HBASE-8713] - [hadoop1] Log spam each time the WAL is rolled
* [HBASE-8803] - region_mover.rb should move multiple regions at a time
* [HBASE-8817] - Enhance The Apache HBase Reference Guide
* [HBASE-9151] - HBCK cannot fix when meta server znode deleted, this can happen if all region servers stopped and there are no logs to split.
* [HBASE-9292] - Syncer fails but we won't go down
* [HBASE-9294] - NPE in /rs-status during RS shutdown
* [HBASE-9346] - HBCK should provide an option to check if regions boundaries are the same in META and in stores.
* [HBASE-9445] - Snapshots should create column family dirs for empty regions
* [HBASE-9473] - Change UI to list 'system tables' rather than 'catalog tables'.
* [HBASE-9485] - TableOutputCommitter should implement recovery if we don't want jobs to start from 0 on RM restart
* [HBASE-9708] - Improve Snapshot Name Error Message
* [HBASE-9721] - RegionServer should not accept regionOpen RPC intended for another(previous) server
* [HBASE-9745] - Append HBASE_CLASSPATH to end of Java classpath and use another env var for prefix
* [HBASE-9746] - RegionServer can't start when replication tries to replicate to an unknown host
* [HBASE-9754] - Eliminate threadlocal from MVCC code
* [HBASE-9778] - Add hint to ExplicitColumnTracker to avoid seeking
* [HBASE-9990] - HTable uses the conf for each "newCaller"
* [HBASE-10018] - Remove region location prefetching
* [HBASE-10061] - TableMapReduceUtil.findOrCreateJar calls updateMap(null, ) resulting in thrown NPE
* [HBASE-10069] - Potential duplicate calls to log#appendNoSync() in HRegion#doMiniBatchMutation()
* [HBASE-10073] - Revert HBASE-9718 (Add a test scope dependency on org.slf4j:slf4j-api to hbase-client)
* [HBASE-10079] - Race in TableName cache
* [HBASE-10080] - Unnecessary call to locateRegion when creating an HTable instance
* [HBASE-10084] - [WINDOWS] bin\hbase.cmd should allow whitespaces in java.library.path and classpath
* [HBASE-10087] - Store should be locked during a memstore snapshot
* [HBASE-10090] - Master could hang in assigning meta
* [HBASE-10097] - Remove a region name string creation in HRegion#nextInternal
* [HBASE-10098] - [WINDOWS] pass in native library directory from hadoop for unit tests
* [HBASE-10099] - javadoc warning introduced by LabelExpander 188: warning - @return tag has no arguments
* [HBASE-10101] - testOfflineRegionReAssginedAfterMasterRestart times out sometimes.
* [HBASE-10103] - TestNodeHealthCheckChore#testRSHealthChore: Stoppable must have been stopped
* [HBASE-10107] - [JDK7] TestHBaseSaslRpcClient.testHBaseSaslRpcClientCreation failing on Jenkins
* [HBASE-10108] - NullPointerException thrown while use Canary with '-regionserver' option
* [HBASE-10112] - Hbase rest query params for maxVersions and maxValues are not parsed
* [HBASE-10114] - _scan_internal() in table.rb should accept argument that specifies reverse scan
* [HBASE-10117] - Avoid synchronization in HRegionScannerImpl.isFilterDone
* [HBASE-10118] - Major compact keeps deletes with future timestamps
* [HBASE-10120] - start-hbase.sh doesn't respect --config in non-distributed mode
* [HBASE-10123] - Change default ports; move them out of linux ephemeral port range
* [HBASE-10132] - sun.security.pkcs11.wrapper.PKCS11Exception: CKR_ARGUMENTS_BAD
* [HBASE-10135] - Remove ? extends from HLogSplitter#getOutputCounts
* [HBASE-10137] - GeneralBulkAssigner with retain assignment plan can be used in EnableTableHandler to bulk assign the regions
* [HBASE-10138] - incorrect or confusing test value is used in block caches
* [HBASE-10142] - TestLogRolling#testLogRollOnDatanodeDeath test failure
* [HBASE-10146] - Bump HTrace version to 2.04
* [HBASE-10148] - [VisibilityController] Tolerate regions in recovery
* [HBASE-10149] - TestZKPermissionsWatcher.testPermissionsWatcher test failure
* [HBASE-10155] - HRegion isRecovering state is wrongly coming in postOpen hook
* [HBASE-10161] - [AccessController] Tolerate regions in recovery
* [HBASE-10163] - Example Thrift DemoClient is flaky
* [HBASE-10176] - Canary#sniff() should close the HTable instance
* [HBASE-10178] - Potential null object dereference in TablePermission#equals()
* [HBASE-10179] - HRegionServer underreports readRequestCounts by 1 under certain conditions
* [HBASE-10182] - Potential null object deference in AssignmentManager#handleRegion()
* [HBASE-10186] - region_mover.rb broken because ServerName constructor is changed to private
* [HBASE-10187] - AccessController#preOpen - Include 'labels' table also into special tables list.
* [HBASE-10193] - Cleanup HRegion if one of the store fails to open at region initialization
* [HBASE-10194] - [Usability]: Instructions in CompactionTool no longer accurate because of namespaces
* [HBASE-10196] - Enhance HBCK to understand the case after online region merge
* [HBASE-10205] - ConcurrentModificationException in BucketAllocator
* [HBASE-10207] - ZKVisibilityLabelWatcher : Populate the labels cache on startup
* [HBASE-10210] - during master startup, RS can be you-are-dead-ed by master in error
* [HBASE-10215] - TableNotFoundException should be thrown after removing stale znode in ETH
* [HBASE-10219] - HTTPS support for HBase in RegionServerListTmpl.jamon
* [HBASE-10220] - Put all test service principals into the superusers list
* [HBASE-10221] - Region from coprocessor invocations can be null on failure
* [HBASE-10223] - [VisibilityController] cellVisibility presence check on Delete mutation is wrong
* [HBASE-10225] - Bug in calls to RegionObsever.postScannerFilterRow
* [HBASE-10226] - [AccessController] Namespace grants not always checked
* [HBASE-10231] - Potential NPE in HBaseFsck#checkMetaRegion()
* [HBASE-10232] - Remove native profile from hbase-shell
* [HBASE-10233] - VisibilityController is too chatty at DEBUG level
* [HBASE-10249] - TestReplicationSyncUpTool fails because failover takes too long
* [HBASE-10251] - Restore API Compat for PerformanceEvaluation.generateValue()
* [HBASE-10260] - Canary Doesn't pick up Configuration properly.
* [HBASE-10264] - [MapReduce]: CompactionTool in mapred mode is missing classes in its classpath
* [HBASE-10267] - TestNamespaceCommands occasionally fails
* [HBASE-10268] - TestSplitLogWorker occasionally fails
* [HBASE-10271] - [regression] Cannot use the wildcard address since HBASE-9593
* [HBASE-10272] - Cluster becomes nonoperational if the node hosting the active Master AND ROOT/META table goes offline
* [HBASE-10274] - MiniZookeeperCluster should close ZKDatabase when shutdown ZooKeeperServers
* [HBASE-10284] - Build broken with svn 1.8
* [HBASE-10292] - TestRegionServerCoprocessorExceptionWithAbort fails occasionally
* [HBASE-10298] - TestIOFencing occasionally fails
* [HBASE-10302] - Fix rat check issues in hbase-native-client.
* [HBASE-10304] - Running an hbase job jar: IllegalAccessError: class com.google.protobuf.ZeroCopyLiteralByteString cannot access its superclass com.google.protobuf.LiteralByteString
* [HBASE-10307] - IntegrationTestIngestWithEncryption assumes localhost cluster
* [HBASE-10310] - ZNodeCleaner session expired for /hbase/master
* [HBASE-10312] - Flooding the cluster with administrative actions leads to collapse
* [HBASE-10313] - Duplicate servlet-api jars in hbase 0.96.0
* [HBASE-10315] - Canary shouldn't exit with 3 if there is no master running.
* [HBASE-10316] - Canary#RegionServerMonitor#monitorRegionServers() should close the scanner returned by table.getScanner()
* [HBASE-10317] - getClientPort method of MiniZooKeeperCluster does not always return the correct value
* [HBASE-10318] - generate-hadoopX-poms.sh expects the version to have one extra '-'
* [HBASE-10320] - Avoid ArrayList.iterator() ExplicitColumnTracker
* [HBASE-10321] - CellCodec has broken the 96 client to 98 server compatibility
* [HBASE-10322] - Strip tags from KV while sending back to client on reads
* [HBASE-10326] - Super user should be able scan all the cells irrespective of the visibility labels
* [HBASE-10327] - Remove remove(K, V) from type PoolMap<K,V>
* [HBASE-10329] - Fail the writes rather than proceeding silently to prevent data loss when AsyncSyncer encounters null writer and its writes aren't synced by other Asyncer
* [HBASE-10330] - TableInputFormat/TableRecordReaderImpl leaks HTable
* [HBASE-10332] - Missing .regioninfo file during daughter open processing
* [HBASE-10333] - Assignments are not retained on a cluster start
* [HBASE-10334] - RegionServer links in table.jsp is broken
* [HBASE-10335] - AuthFailedException in zookeeper may block replication forever
* [HBASE-10336] - Remove deprecated usage of Hadoop HttpServer in InfoServer
* [HBASE-10337] - HTable.get() uninteruptible
* [HBASE-10338] - Region server fails to start with AccessController coprocessor if installed into RegionServerCoprocessorHost
* [HBASE-10339] - Mutation::getFamilyMap method was lost in 98
* [HBASE-10349] - Table became unusable when master balanced its region after table was dropped
* [HBASE-10365] - HBaseFsck should clean up connection properly when repair is completed
* [HBASE-10370] - Compaction in out-of-date Store causes region split failure
* [HBASE-10371] - Compaction creates empty hfile, then selects this file for compaction and creates empty hfile and over again
* [HBASE-10375] - hbase-default.xml hbase.status.multicast.address.port does not match code
* [HBASE-10384] - Failed to increment serveral columns in one Increment
* [HBASE-10392] - Correct references to hbase.regionserver.global.memstore.upperLimit
* [HBASE-10397] - Fix findbugs introduced from HBASE-9426
* [HBASE-10400] - [hbck] Continue if region dir missing on region merge attempt
* [HBASE-10401] - [hbck] perform overlap group merges in parallel
* [HBASE-10407] - String Format Exception
* [HBASE-10412] - Distributed log replay : Cell tags getting missed
* [HBASE-10413] - Tablesplit.getLength returns 0
* [HBASE-10417] - index is not incremented in PutSortReducer#reduce()
* [HBASE-10422] - ZeroCopyLiteralByteString.zeroCopyGetBytes has an unusable prototype and conflicts with AsyncHBase
* [HBASE-10426] - user_permission in security.rb calls non-existent UserPermission#getTable method
* [HBASE-10428] - Test jars should have scope test
* [HBASE-10429] - Make Visibility Controller to throw a better msg if it is of type RegionServerCoprocessor
* [HBASE-10431] - Rename com.google.protobuf.ZeroCopyLiteralByteString
* [HBASE-10432] - Rpc retries non-recoverable error
* [HBASE-10433] - SecureProtobufWALReader does not handle unencrypted WALs if configured to encrypt
* [HBASE-10434] - Store Tag compression information for a WAL in its header
* [HBASE-10435] - Lower the log level of Canary region server match
* [HBASE-10436] - restore regionserver lists removed from hbase 0.96+ jmx
* [HBASE-10438] - NPE from LRUDictionary when size reaches the max init value
* [HBASE-10441] - [docs] nit default max versions is now 1 instead of 3 after HBASE-8450
* [HBASE-10442] - prepareDelete() isn't called before doPreMutationHook for a row deletion case
* [HBASE-10443] - IndexOutOfBoundExceptions when processing compressed tags in HFile
* [HBASE-10446] - Backup master gives Error 500 for debug dump
* [HBASE-10447] - Memstore flusher scans storefiles also when the scanner heap gets reset
* [HBASE-10448] - ZKUtil create and watch methods don't set watch in some cases
* [HBASE-10449] - Wrong execution pool configuration in HConnectionManager
* [HBASE-10451] - Enable back Tag compression on HFiles
* [HBASE-10452] - Fix potential bugs in exception handlers
* [HBASE-10454] - Tags presence file info can be wrong in HFiles when PrefixTree encoding is used
* [HBASE-10455] - cleanup InterruptedException management
* [HBASE-10456] - Balancer should not run if it's just turned off.
* [HBASE-10458] - Typo in book chapter 9 architecture.html
* [HBASE-10459] - Broken link F.1. HBase Videos
* [HBASE-10460] - Return value of Scan#setSmall() should be void
* [HBASE-10461] - table.close() in TableEventHandler#reOpenAllRegions() should be enclosed in finally block
* [HBASE-10469] - Hbase book client.html has a broken link
* [HBASE-10470] - Import generates huge log file while importing large amounts of data
* [HBASE-10472] - Manage the interruption in ZKUtil#getData
* [HBASE-10476] - HBase Master log grows very fast after stopped hadoop (due to connection exception)
* [HBASE-10477] - Regression from HBASE-10337
* [HBASE-10478] - Hbase book presentations page has broken link
* [HBASE-10481] - API Compatibility JDiff script does not properly handle arguments in reverse order
* [HBASE-10482] - ReplicationSyncUp doesn't clean up its ZK, needed for tests
* [HBASE-10485] - PrefixFilter#filterKeyValue() should perform filtering on row key
* [HBASE-10486] - ProtobufUtil Append & Increment deserialization lost cell level timestamp
* [HBASE-10488] - 'mvn site' is broken due to org.apache.jasper.JspC not found
* [HBASE-10490] - Simplify RpcClient code
* [HBASE-10493] - InclusiveStopFilter#filterKeyValue() should perform filtering on row key
* [HBASE-10495] - upgrade script is printing usage two times with help option.
* [HBASE-10500] - Some tools OOM when BucketCache is enabled
* [HBASE-10501] - Improve IncreasingToUpperBoundRegionSplitPolicy to avoid too many regions
* [HBASE-10506] - Fail-fast if client connection is lost before the real call be executed in RPC layer
* [HBASE-10510] - HTable is not closed in LoadTestTool#loadTable()
* [HBASE-10514] - Forward port HBASE-10466, possible data loss when failed flushes
* [HBASE-10516] - Refactor code where Threads.sleep is called within a while/for loop
* [HBASE-10525] - Allow the client to use a different thread for writing to ease interrupt
* [HBASE-10533] - commands.rb is giving wrong error messages on exceptions
* [HBASE-10534] - Rowkey in TsvImporterTextMapper initializing with wrong length
* [HBASE-10537] - Let the ExportSnapshot mapper fail and retry on error
* [HBASE-10539] - HRegion.addAndGetGlobalMemstoreSize returns previous size
* [HBASE-10545] - RS Hangs waiting on region to close on shutdown; has to timeout before can go down
* [HBASE-10546] - Two scanner objects are open for each hbase map task but only one scanner object is closed
* [HBASE-10547] - TestFixedLengthWrapper#testReadWrite occasionally fails with the IBM JDK
* [HBASE-10548] - Correct commons-math dependency version
* [HBASE-10549] - When there is a hole, LoadIncrementalHFiles will hang in an infinite loop.
* [HBASE-10552] - HFilePerformanceEvaluation.GaussianRandomReadBenchmark fails sometimes.
* [HBASE-10556] - Possible data loss due to non-handled DroppedSnapshotException for user-triggered flush from client/shell
* [HBASE-10563] - Set name for FlushHandler thread
* [HBASE-10564] - HRegionServer.nextLong should be removed since it's not used anywhere, or should be used somewhere it meant to
* [HBASE-10565] - FavoredNodesPlan accidentally uses an internal Netty type
* [HBASE-10566] - cleanup rpcTimeout in the client
* [HBASE-10567] - Add overwrite manifest option to ExportSnapshot
* [HBASE-10575] - ReplicationSource thread can't be terminated if it runs into the loop to contact peer's zk ensemble and fails continuously
* [HBASE-10579] - [Documentation]: ExportSnapshot tool package incorrectly documented
* [HBASE-10580] - IntegrationTestingUtility#restoreCluster leak resource when running in a mini cluster mode
* [HBASE-10581] - ACL znode are left without PBed during upgrading hbase0.94* to hbase0.96+
* [HBASE-10582] - 0.94->0.96 Upgrade: ACL can't be repopulated when ACL table contains row for table '-ROOT' or '.META.'
* [HBASE-10585] - Avoid early creation of Node objects in LRUDictionary.BidirectionalLRUMap
* [HBASE-10586] - hadoop2-compat IPC metric registred twice
* [HBASE-10587] - Master metrics clusterRequests is wrong
* [HBASE-10593] - FileInputStream in JenkinsHash#main() is never closed
* [HBASE-10594] - Speed up TestRestoreSnapshotFromClient
* [HBASE-10598] - Written data can not be read out because MemStore#timeRangeTracker might be updated concurrently
* [HBASE-10600] - HTable#batch() should perform validation on empty Put
* [HBASE-10604] - Fix parseArgs javadoc
* [HBASE-10606] - Bad timeout in RpcRetryingCaller#callWithRetries w/o parameters
* [HBASE-10608] - Acquire the FS Delegation Token for Secure ExportSnapshot
* [HBASE-10611] - Description for hbase:acl table is wrong on master-status#catalogTables
* [HBASE-10614] - Master could not be stopped
* [HBASE-10618] - User should not be allowed to disable/drop visibility labels table
* [HBASE-10621] - Unable to grant user permission to namespace
* [HBASE-10622] - Improve log and Exceptions in Export Snapshot
* [HBASE-10624] - Fix 2 new findbugs warnings introduced by HBASE-10598
* [HBASE-10627] - A logic mistake in HRegionServer isHealthy
* [HBASE-10631] - Avoid extra seek on FileLink open
* [HBASE-10632] - Region lost in limbo after ArrayIndexOutOfBoundsException during assignment
* [HBASE-10637] - rpcClient: Setup the iostreams when writing
* [HBASE-10639] - Unload script displays wrong counts (off by one) when unloading regions
* [HBASE-10644] - TestSecureExportSnapshot#testExportFileSystemState fails on hadoop-1
* [HBASE-10656] - high-scale-lib's Counter depends on Oracle (Sun) JRE, and also has some bug
* [HBASE-10660] - MR over snapshots can OOM when alternative blockcache is enabled
* [HBASE-10662] - RegionScanner is never closed if the region has been moved-out or re-opened when performing scan request
* [HBASE-10665] - TestCompaction and TestCompactionWithCoprocessor run too long
* [HBASE-10666] - TestMasterCoprocessorExceptionWithAbort hangs at shutdown
* [HBASE-10668] - TestExportSnapshot runs too long
* [HBASE-10669] - [hbck tool] Usage is wrong for hbck tool for -sidelineCorruptHfiles option
* [HBASE-10675] - IntegrationTestIngestWithACL should allow User to be passed as Parameter
* [HBASE-10677] - boundaries check in hbck throwing IllegalArgumentException
* [HBASE-10679] - Both clients get wrong scan results if the first scanner expires and the second scanner is created with the same scannerId on the same region
* [HBASE-10682] - region_mover.rb throws "can't convert nil into String" for regions moved
* [HBASE-10685] - [WINDOWS] TestKeyStoreKeyProvider fails on windows
* [HBASE-10686] - [WINDOWS] TestStripeStoreFileManager fails on windows
* [HBASE-10687] - Fix description about HBaseLocalFileSpanReceiver in reference manual
* [HBASE-10692] - The Multi TableMap job don't support the security HBase cluster
* [HBASE-10694] - TableSkewCostFunction#cost() casts integral division result to double
* [HBASE-10705] - CompactionRequest#toString() may throw NullPointerException
* [HBASE-10706] - Disable writeToWal in tests where possible
* [HBASE-10714] - SyncFuture hangs when sequence is 0
* [HBASE-10715] - TimeRange has a poorly formatted error message
* [HBASE-10716] - [Configuration]: hbase.regionserver.region.split.policy should be part of hbase-default.xml
* [HBASE-10718] - TestHLogSplit fails when it sets a KV size to be negative
* [HBASE-10720] - rpcClient: Wrong log level when closing the connection
* [HBASE-10726] - Fix java.lang.ArrayIndexOutOfBoundsException in StochasticLoadBalancer$LocalityBasedCandidateGenerator
* [HBASE-10731] - Fix environment variables typos in scripts
* [HBASE-10735] - [WINDOWS] Set -XX:MaxPermSize for unit tests
* [HBASE-10736] - Fix Javadoc warnings introduced in HBASE-10169
* [HBASE-10737] - HConnectionImplementation should stop RpcClient on close
* [HBASE-10738] - AssignmentManager should shut down executors on stop
* [HBASE-10739] - RS web UI NPE if master shuts down sooner
* [HBASE-10745] - Access ShutdownHook#fsShutdownHooks should be synchronized
* [HBASE-10749] - CellComparator.compareStatic() compares type wrongly
* [HBASE-10751] - TestHRegion testWritesWhileScanning occasional fail since HBASE-10514 went in
* [HBASE-10755] - MetricsRegionSourceImpl creates metrics that start with a lower case
* [HBASE-10760] - Wrong methods' names in ClusterLoadState class
* [HBASE-10762] - clone_snapshot doesn't check for missing namespace
* [HBASE-10766] - SnapshotCleaner allows to delete referenced files
* [HBASE-10770] - Don't exit from the Canary daemon mode if no regions are present
* [HBASE-10792] - RingBufferTruck does not release its payload
* [HBASE-10793] - AuthFailed as a valid zookeeper state
* [HBASE-10799] - [WINDOWS] TestImportTSVWithVisibilityLabels.testBulkOutputWithTsvImporterTextMapper fails on windows
* [HBASE-10802] - CellComparator.compareStaticIgnoreMvccVersion compares type wrongly
* [HBASE-10804] - Add a validations step to ExportSnapshot
* [HBASE-10805] - Speed up KeyValueHeap.next() a bit
* [HBASE-10806] - Two protos missing in hbase-protocol/pom.xml
* [HBASE-10809] - HBaseAdmin#deleteTable fails when META region happen to move around same time
* [HBASE-10814] - RpcClient: some calls can get stuck when connection is closing
* [HBASE-10825] - Add copy-from option to ExportSnapshot
* [HBASE-10829] - Flush is skipped after log replay if the last recovered edits file is skipped
* [HBASE-10830] - Integration test MR jobs attempt to load htrace jars from the wrong location
* [HBASE-10831] - IntegrationTestIngestWithACL is not setting up LoadTestTool correctly
* [HBASE-10833] - Region assignment may fail during cluster start up
* [HBASE-10838] - Insufficient AccessController covering permission check
* [HBASE-10839] - NullPointerException in construction of RegionServer in Security Cluster
* [HBASE-10840] - Fix findbug warn induced by HBASE-10569
* [HBASE-10845] - Memstore snapshot size isn't updated in DefaultMemStore#rollback()
* [HBASE-10846] - Links between active and backup masters are broken
* [HBASE-10848] - Filter SingleColumnValueFilter combined with NullComparator does not work
* [HBASE-10849] - Fix increased javadoc warns
* [HBASE-10850] - essential column family optimization is broken
* [HBASE-10851] - Wait for regionservers to join the cluster
* [HBASE-10853] - NPE in RSRpcServices.get on trunk
* [HBASE-10854] - [VisibilityController] Apply MAX_VERSIONS from schema or request when scanning
* [HBASE-10860] - Insufficient AccessController covering permission check
* [HBASE-10862] - Update config field names in hbase-default.xml description for hbase.hregion.memstore.block.multiplier
* [HBASE-10863] - Scan doesn't return rows for user who has authorization by visibility label in secure deployment
* [HBASE-10864] - Spelling nit
* [HBASE-10890] - ExportSnapshot needs to add acquired token to job
* [HBASE-10895] - unassign a region fails due to the hosting region server is in FailedServerList
* [HBASE-10897] - On master start, deadlock if refresh UI
* [HBASE-10899] - [AccessController] Apply MAX_VERSIONS from schema or request when scanning
* [HBASE-10903] - HBASE-10740 regression; cannot pass commands for zk to run
* [HBASE-10917] - Fix hbase book "Tests" page
* [HBASE-10922] - Log splitting status should always be closed
* [HBASE-10931] - Enhance logs
* [HBASE-10941] - default for max version isn't updated in doc after change on 0.96
* [HBASE-10948] - Fix hbase table file 'x' mode
* [HBASE-10949] - Reversed scan could hang
* [HBASE-10954] - Fix TestCloseRegionHandler.testFailedFlushAborts
* [HBASE-10955] - HBCK leaves the region in masters in-memory RegionStates if region hdfs dir is lost
* [HBASE-10958] - [dataloss] Bulk loading with seqids can prevent some log entries from being replayed
* [HBASE-10964] - Delete mutation is not consistent with Put wrt timestamp
* [HBASE-10966] - RowCounter misinterprets column names that have colons in their qualifier
* [HBASE-10967] - CatalogTracker.waitForMeta should not wait indefinitely silently
* [HBASE-10968] - Null check in TableSnapshotInputFormat#TableSnapshotRegionRecordReader#initialize() is redundant
* [HBASE-10970] - [AccessController] Issues with covering cell permission checks
* [HBASE-10976] - Start CatalogTracker after cluster ID is available
* [HBASE-10979] - Fix AnnotationReadingPriorityFunction "scan" handling
* [HBASE-10995] - Fix resource leak related to unclosed HBaseAdmin
* [HBASE-11005] - Remove dead code in HalfStoreFileReader#getScanner#seekBefore()
* [HBASE-11009] - We sync every hbase:meta table write twice
* [HBASE-11011] - Avoid extra getFileStatus() calls on Region startup
* [HBASE-11012] - InputStream is not properly closed in two methods of JarFinder
* [HBASE-11018] - ZKUtil.getChildDataAndWatchForNewChildren() will not return null as indicated
* [HBASE-11028] - FSLog: Avoid an extra sync if the current transaction is already sync'd
* [HBASE-11030] - HBaseTestingUtility.getMiniHBaseCluster should be able to return null
* [HBASE-11036] - Online schema change with region merge may cause data loss
* [HBASE-11038] - Filtered scans can bypass metrics collection
* [HBASE-11049] - HBase WALPlayer needs to add credentials to job to play to table
* [HBASE-11052] - Sending random data crashes thrift service
* [HBASE-11055] - Extends the sampling size
* [HBASE-11064] - Odd behaviors of TableName for empty namespace
* [HBASE-11081] - Trunk Master won't start; looking for Constructor that takes conf only
* [HBASE-11082] - Potential unclosed TraceScope in FSHLog#replaceWriter()
* [HBASE-11096] - stop method of Master and RegionServer coprocessor is not invoked
* [HBASE-11112] - PerformanceEvaluation should document --multiGet option on its printUsage.
* [HBASE-11117] - [AccessController] checkAndPut/Delete hook should check only Read permission
* [HBASE-11118] - non environment variable solution for "IllegalAccessError: class com.google.protobuf.ZeroCopyLiteralByteString cannot access its superclass com.google.protobuf.LiteralByteString"
* [HBASE-11120] - Update documentation about major compaction algorithm
* [HBASE-11133] - Add an option to skip snapshot verification after Export
* [HBASE-11139] - BoundedPriorityBlockingQueue#poll() should check the return value from awaitNanos()
* [HBASE-11143] - Improve replication metrics
* [HBASE-11149] - Wire encryption is broken
* [HBASE-11150] - Images in website are broken
* [HBASE-11155] - Fix Validation Errors in Ref Guide
* [HBASE-11162] - RegionServer webui uses the default master info port irrespective of the user configuration.
* [HBASE-11168] - [docs] Remove references to RowLocks in post 0.96 docs.
* [HBASE-11169] - nit: fix incorrect javadoc in OrderedBytes about BlobVar and BlobCopy
* [HBASE-11176] - Make /src/main/xslt/configuration_to_docbook_section.xsl produce better Docbook
* [HBASE-11177] - 'hbase.rest.filter.classes' exists in hbase-default.xml twice
* [HBASE-11185] - Parallelize Snapshot operations
* [HBASE-11186] - Improve TestExportSnapshot verifications
* [HBASE-11189] - Subprocedure should be marked as complete upon failure
* [HBASE-11190] - Fix easy typos in documentation
* [HBASE-11194] - [AccessController] issue with covering permission check in case of concurrent op on same row
* [HBASE-11196] - Update description of -ROOT- in ref guide
* [HBASE-11202] - Cleanup on HRegion class
* [HBASE-11212] - Fix increment index in KeyValueSortReducer
* [HBASE-11215] - Deprecate void setAutoFlush(boolean autoFlush, boolean clearBufferOnFail)
* [HBASE-11217] - Race between SplitLogManager task creation + TimeoutMonitor
* [HBASE-11218] - Data loss in HBase standalone mode
* [HBASE-11226] - Document and increase the default value for hbase.hstore.flusher.count
* [HBASE-11234] - FastDiffDeltaEncoder#getFirstKeyInBlock returns wrong result
* [HBASE-11237] - Bulk load initiated by user other than hbase fails
* [HBASE-11238] - Add info about SlabCache and BucketCache to Ref Guide
* [HBASE-11239] - Forgot to svn add test that was part of HBASE-11171, TestCacheConfig
* [HBASE-11248] - KeyOnlyKeyValue#toString() passes wrong offset to keyToString()
* [HBASE-11251] - LoadTestTool should grant READ permission for the users that are given READ access for specific cells
* [HBASE-11252] - Fixing new javadoc warnings in master branch
* [HBASE-11253] - IntegrationTestWithCellVisibilityLoadAndVerify failing since HBASE-10326
* [HBASE-11255] - Negative request num in region load
* [HBASE-11260] - hbase-default.xml refers to hbase.regionserver.global.memstore.upperLimit which is deprecated
* [HBASE-11267] - Dynamic metrics2 metrics may consume large amount of heap memory
* [HBASE-11268] - HTablePool is now a deprecated class, should update docs to reflect this
* [HBASE-11273] - Fix jersey and slf4j deps
* [HBASE-11275] - [AccessController] postCreateTable hook fails when another CP creates table on their startup
* [HBASE-11277] - RPCServer threads can wedge under high load
* [HBASE-11279] - Block cache could be disabled by mistake
* [HBASE-11285] - Expand coprocs info in Ref Guide
* [HBASE-11297] - Remove some synchros in the rpcServer responder
* [HBASE-11298] - Simplification in RpcServer code
* [HBASE-11302] - ReplicationSourceManager#sources is not thread safe
* [HBASE-11310] - Delete's copy constructor should copy the attributes also
* [HBASE-11311] - Secure Bulk Load does not execute chmod 777 on the files
* [HBASE-11312] - Minor refactoring of TestVisibilityLabels class
* [HBASE-11320] - Reenable bucket cache logging
* [HBASE-11324] - Update 2.5.2.8. Managed Compactions
* [HBASE-11327] - ExportSnapshot hit stackoverflow error when target snapshotDir doesn't contain uri
* [HBASE-11329] - Minor fixup of new blockcache tab number formatting
* [HBASE-11335] - Fix the TABLE_DIR param in TableSnapshotInputFormat
* [HBASE-11337] - Document how to create, modify, delete a table using Java
* [HBASE-11338] - Expand documentation on bloom filters
* [HBASE-11340] - Remove references to xcievers in documentation
* [HBASE-11341] - ZKProcedureCoordinatorRpcs should respond only to members
* [HBASE-11342] - The method isChildReadLock in class ZKInterProcessLockBase is wrong
* [HBASE-11347] - For some errors, the client can retry infinitely
* [HBASE-11353] - Wrong Write Request Count
* [HBASE-11363] - Access checks in preCompact and preCompactSelection are out of sync
* [HBASE-11371] - Typo in Thrift2 docs
* [HBASE-11373] - hbase-protocol compile failed for name conflict of RegionTransition
* [HBASE-11374] - RpcRetryingCaller#callWithoutRetries has a timeout of zero
* [HBASE-11378] - TableMapReduceUtil overwrites user supplied options for multiple tables/scaners job
* [HBASE-11380] - HRegion lock object is not being released properly, leading to snapshot failure
* [HBASE-11382] - Adding unit test for HBASE-10964 (Delete mutation is not consistent with Put wrt timestamp)
* [HBASE-11387] - metrics: wrong totalRequestCount
* [HBASE-11391] - Thrift table creation will fail with default TTL with sanity checks
* [HBASE-11396] - Invalid meta entries can lead to unstartable master
* [HBASE-11397] - When merging expired stripes, we need to create an empty file to preserve metadata.
* [HBASE-11399] - Improve Quickstart chapter and move Pseudo-distributed and distributed to it
* [HBASE-11403] - Fix race conditions around Object#notify
* [HBASE-11413] - [findbugs] RV: Negating the result of compareTo()/compare()
* [HBASE-11418] - build target "site" doesn't respect hadoop-two.version property
* [HBASE-11422] - Specification of scope is missing for certain Hadoop dependencies
* [HBASE-11423] - Visibility label and per cell ACL feature not working with HTable#mutateRow() and MultiRowMutationEndpoint
* [HBASE-11424] - Avoid usage of CellUtil#getTagArray(Cell cell) within server
* [HBASE-11430] - lastFlushSeqId has been updated wrongly during region open
* [HBASE-11432] - [AccessController] Remove cell first strategy
* [HBASE-11433] - LruBlockCache does not respect its configurable parameters
* [HBASE-11435] - Visibility labelled cells fail to getting replicated
* [HBASE-11439] - StripeCompaction may not obey the OffPeak rule to compaction
* [HBASE-11442] - ReplicationSourceManager doesn't cleanup the queues for recovered sources
* [HBASE-11445] - TestZKProcedure#testMultiCohortWithMemberTimeoutDuringPrepare is flaky
* [HBASE-11448] - Fix javadoc warnings
* [HBASE-11449] - IntegrationTestIngestWithACL fails to use different users after HBASE-10810
* [HBASE-11457] - Increment HFile block encoding IVs accounting for ciper's internal use
* [HBASE-11458] - NPEs if RegionServer cannot initialize
* [HBASE-11460] - Deadlock in HMaster on masterAndZKLock in HConnectionManager
* [HBASE-11463] - (findbugs) HE: Class defines equals() and uses Object.hashCode()
* [HBASE-11465] - [VisibilityController] Reserved tags check not happening for Append/Increment
* [HBASE-11475] - Distributed log replay should also replay compaction events
* [HBASE-11476] - Expand 'Conceptual View' section of Data Model chapter
* [HBASE-11477] - book.xml has Docbook validity issues (again)
* [HBASE-11481] - TableSnapshotInputFormat javadoc wrongly claims HBase "enforces security"
* [HBASE-11487] - ScanResponse carries non-zero cellblock for CloseScanRequest (ScanRequest with close_scanner = true)
* [HBASE-11488] - cancelTasks in SubprocedurePool can hang during task error
* [HBASE-11489] - ClassNotFoundException while running IT tests in trunk using 'mvn verify'
* [HBASE-11492] - Hadoop configuration overrides some ipc parameters including tcpNoDelay
* [HBASE-11493] - Autorestart option is not working because of stale znode "shutdown"
* [HBASE-11496] - HBASE-9745 broke cygwin CLASSPATH translation
* [HBASE-11502] - Track down broken images in Ref Guide
* [HBASE-11505] - 'snapshot' shell command shadows 'snapshot' shell when 'help' is invoked
* [HBASE-11506] - IntegrationTestWithCellVisibilityLoadAndVerify allow User to be passed as arg
* [HBASE-11509] - Forward port HBASE-11039 to trunk and branch-1 after HBASE-11489
* [HBASE-11510] - Visibility serialization format tag gets duplicated in Append/Increment'ed cells
* [HBASE-11514] - Fix findbugs warnings in blockcache
* [HBASE-11517] - TestReplicaWithCluster turns zombie
* [HBASE-11518] - doc update for how to create non-shared HConnection
* [HBASE-11523] - JSON serialization of PE Options is broke
* [HBASE-11525] - Region server holding in region states is out of sync with meta
* [HBASE-11527] - Cluster free memory limit check should consider L2 block cache size also when L2 cache is onheap.
* [HBASE-11530] - RegionStates adds regions to wrong servers
* [HBASE-11531] - RegionStates for regions under region-in-transition znode are not updated on startup
* [HBASE-11534] - Remove broken JAVA_HOME autodetection in hbase-config.sh
* [HBASE-11535] - ReplicationPeer map is not thread safe
* [HBASE-11536] - Puts of region location to Meta may be out of order which causes inconsistent of region location
* [HBASE-11537] - Avoid synchronization on instances of ConcurrentMap
* [HBASE-11540] - Document HBASE-11474
* [HBASE-11541] - Wrong result when scaning meta with startRow
* [HBASE-11545] - mapred.TableSnapshotInputFormat is missing InterfaceAudience annotation
* [HBASE-11550] - Custom value for BUCKET_CACHE_BUCKETS_KEY should be sorted
* [HBASE-11551] - BucketCache$WriterThread.run() doesn't handle exceptions correctly
* [HBASE-11554] - Remove Reusable poolmap Rpc client type.
* [HBASE-11555] - TableSnapshotRegionSplit should be public
* [HBASE-11558] - Caching set on Scan object gets lost when using TableMapReduceUtil in 0.95+
* [HBASE-11561] - deprecate ImmutableBytesWritable.getSize and replace with getLength
* [HBASE-11564] - Improve cancellation management in the rpc layer
* [HBASE-11565] - Stale connection could stay for a while
* [HBASE-11575] - Pseudo distributed mode does not work as documented
* [HBASE-11579] - CopyTable should check endtime value only if != 0
* [HBASE-11582] - Fix Javadoc warning in DataInputInputStream and CacheConfig
* [HBASE-11586] - HFile's HDFS op latency sampling code is not used
* [HBASE-11588] - RegionServerMetricsWrapperRunnable misused the 'period' parameter
* [HBASE-11589] - AccessControlException should be a not retriable exception
* [HBASE-11591] - Scanner fails to retrieve KV from bulk loaded file with highest sequence id than the cell's mvcc in a non-bulk loaded file
* [HBASE-11593] - TestCacheConfig failing consistently in precommit builds
* [HBASE-11594] - Unhandled NoNodeException in distributed log replay mode
* [HBASE-11603] - Apply version of HADOOP-8027 to our JMXJsonServlet
* [HBASE-11609] - LoadIncrementalHFiles fails if the namespace is specified
* [HBASE-11617] - incorrect AgeOfLastAppliedOp and AgeOfLastShippedOp in replication Metrics when no new replication OP
* [HBASE-11620] - Record the class name of Writer in WAL header so that only proper Reader can open the WAL file
* [HBASE-11627] - RegionSplitter's rollingSplit terminated with "/ by zero", and the _balancedSplit file was not deleted properly
* [HBASE-11632] - Region split needs to clear force split flag at the end of SplitRequest run
* [HBASE-11659] - Region state RPC call is not idempotent
* [HBASE-11662] - Launching shell with long-form --debug fails
* [HBASE-11668] - Re-add HBASE_LIBRARY_PATH to bin/hbase
* [HBASE-11671] - TestEndToEndSplitTransaction fails on master
* [HBASE-11678] - BucketCache ramCache fills heap after running a few hours
* [HBASE-11687] - No need to abort on postOpenDeployTasks exception if region opening is cancelled
* [HBASE-11703] - Meta region state could be corrupted
* [HBASE-11705] - callQueueSize should be decremented in a fail-fast scenario
* [HBASE-11708] - RegionSplitter incorrectly calculates splitcount
* [HBASE-11709] - TestMasterShutdown can fail sometime
* [HBASE-11716] - LoadTestDataGeneratorWithVisibilityLabels should handle Delete mutations
* [HBASE-11717] - Remove unused config 'hbase.offheapcache.percentage' from hbase-default.xml and book
* [HBASE-11718] - Remove some logs in RpcClient.java
* [HBASE-11719] - Remove some unused paths in AsyncClient
* [HBASE-11725] - Backport failover checking change to 1.0
* [HBASE-11726] - Master should fail-safe if starting with a pre 0.96 layout
* [HBASE-11727] - Assignment wait time error in case of ServerNotRunningYetException
* [HBASE-11728] - Data loss while scanning using PREFIX_TREE DATA-BLOCK-ENCODING
* [HBASE-11733] - Avoid copy-paste in Master/Region CoprocessorHost
* [HBASE-11744] - RpcServer code should not use a collection from netty internal
* [HBASE-11745] - FilterAllFilter should return ReturnCode.SKIP
* [HBASE-11755] - VisibilityController returns the wrong value for preBalanceSwitch()
* [HBASE-11766] - Backdoor CoprocessorHConnection is no longer being used for local writes
* [HBASE-11770] - TestBlockCacheReporting.testBucketCache is not stable
* [HBASE-11772] - Bulk load mvcc and seqId issues with native hfiles
* [HBASE-11773] - Wrong field used for protobuf construction in RegionStates.
* [HBASE-11782] - Document that hbase.MetaMigrationConvertingToPB needs to be set to true for migrations pre 0.96
* [HBASE-11787] - TestRegionLocations is not categorized
* [HBASE-11788] - hbase is not deleting the cell when a Put with a KeyValue, KeyValue.Type.Delete is submitted
* [HBASE-11789] - LoadIncrementalHFiles is not picking up the -D option
* [HBASE-11794] - StripeStoreFlusher causes NullPointerException
* [HBASE-11797] - Create Table interface to replace HTableInterface
* [HBASE-11802] - Scan copy constructor doesn't copy reversed member variable
* [HBASE-11813] - CellScanner#advance may overflow stack
* [HBASE-11814] - TestAssignmentManager.testCloseFailed() and testOpenCloseRacing() is flaky
* [HBASE-11816] - Initializing custom Metrics implementation failed in Mapper or Reducer
* [HBASE-11820] - ReplicationSource : Set replication codec class as RPC codec class on a clonned Configuration
* [HBASE-11823] - Cleanup javadoc warnings.
* [HBASE-11832] - maven release plugin overrides command line arguments
* [HBASE-11836] - IntegrationTestTimeBoundedMultiGetRequestsWithRegionReplicas tests simple get by default
* [HBASE-11839] - TestRegionRebalance is flakey
* [HBASE-11844] - region_mover.rb load enters an infinite loop if region already present on target server
* [HBASE-11851] - RpcClient can try to close a connection not ready to close
* [HBASE-11856] - hbase-common needs a log4j.properties resource for handling unit test logging output
* [HBASE-11857] - Restore ReaderBase.initAfterCompression() and WALCellCodec.create(Configuration, CompressionContext)
* [HBASE-11859] - 'hadoop jar' references in documentation should mention hbase-server.jar, not hbase.jar
* [HBASE-11863] - WAL files are not archived and stays in the WAL directory after splitting
* [HBASE-11876] - RegionScanner.nextRaw(...) should not update metrics
* [HBASE-11878] - TestVisibilityLabelsWithDistributedLogReplay#testAddVisibilityLabelsOnRSRestart sometimes fails due to VisibilityController not yet initialized
* [HBASE-11880] - NPE in MasterStatusServlet
* [HBASE-11882] - Row level consistency may not be maintained with bulk load and compaction
* [HBASE-11886] - The creator of the table should have all permissions on the table
* [HBASE-11887] - Memory retention in branch-1; millions of instances of LiteralByteString for column qualifier and value
* [HBASE-11892] - configs contain stale entries
* [HBASE-11893] - RowTooBigException should be in hbase-client module
* [HBASE-11896] - LoadIncrementalHFiles fails in secure mode if the namespace is specified
* [HBASE-11898] - CoprocessorHost.Environment should cache class loader instance
* [HBASE-11905] - Add orca to server UIs and update logo.
* [HBASE-11921] - Minor fixups that come of testing branch-1
* [HBASE-11932] - Stop the html-single from building a html-single of every chapter and cluttering the docbkx directory
* [HBASE-11936] - IsolationLevel must be attribute of a Query not a Scan
* [HBASE-11946] - Get xref and API docs to build properly again
* [HBASE-11947] - NoSuchElementException in balancer for master regions
* [HBASE-11949] - Setting hfile.block.cache.size=0 doesn't actually disable blockcache
* [HBASE-11959] - TestAssignmentManagerOnCluster is flaky
* [HBASE-11972] - The "doAs user" used in the update to hbase:acl table RPC is incorrect
* [HBASE-11976] - Server startcode is not checked for bulk region assignment
* [HBASE-11984] - TestClassFinder failing on occasion
* [HBASE-11989] - IntegrationTestLoadAndVerify cannot be configured anymore on distributed mode
** Improvement
* [HBASE-2217] - VM OPTS for shell only
* [HBASE-3270] - When we create the .version file, we should create it in a tmp location and then move it into place
* [HBASE-4163] - Create Split Strategy for YCSB Benchmark
* [HBASE-4495] - CatalogTracker has an identity crisis; needs to be cut-back in scope
* [HBASE-5349] - Automagically tweak global memstore and block cache sizes based on workload
* [HBASE-5923] - Cleanup checkAndXXX logic
* [HBASE-6626] - Add a chapter on HDFS in the troubleshooting section of the HBase reference guide.
* [HBASE-6990] - Pretty print TTL
* [HBASE-7088] - Duplicate code in RowCounter
* [HBASE-7849] - Provide administrative limits around bulkloads of files into a single region
* [HBASE-7910] - Dont use reflection for security
* [HBASE-7987] - Snapshot Manifest file instead of multiple empty files
* [HBASE-8076] - add better doc for HBaseAdmin#offline API.
* [HBASE-8298] - In shell, provide alias of 'desc' for 'describe'
* [HBASE-8315] - Documentation should have more information of LRU Stats
* [HBASE-8332] - Add truncate as HMaster method
* [HBASE-8495] - Change ownership of the directory to bulk load
* [HBASE-8604] - improve reporting of incorrect peer address in replication
* [HBASE-8755] - A new write thread model for HLog to improve the overall HBase write throughput
* [HBASE-8763] - Combine MVCC and SeqId
* [HBASE-8807] - HBase MapReduce Job-Launch Documentation Misplaced
* [HBASE-8970] - [book] Filter language documentation is hidden
* [HBASE-9343] - Implement stateless scanner for Stargate
* [HBASE-9345] - Add support for specifying filters in scan
* [HBASE-9426] - Make custom distributed barrier procedure pluggable
* [HBASE-9501] - Provide throttling for replication
* [HBASE-9524] - Multi row get does not return any results even if any one of the rows specified in the query is missing and improve exception handling
* [HBASE-9542] - Have Get and MultiGet do cellblocks, currently they are pb all the time
* [HBASE-9829] - make the compaction logging less confusing
* [HBASE-9857] - Blockcache prefetch option
* [HBASE-9866] - Support the mode where REST server authorizes proxy users
* [HBASE-9892] - Add info port to ServerName to support multi instances in a node
* [HBASE-9999] - Add support for small reverse scan
* [HBASE-10010] - eliminate the put latency spike on the new log file beginning
* [HBASE-10048] - Add hlog number metric in regionserver
* [HBASE-10074] - consolidate and improve capacity/sizing documentation
* [HBASE-10086] - [book] document the HBase canary tool usage in the HBase Book
* [HBASE-10116] - SlabCache metrics improvements
* [HBASE-10128] - Improve the copy table doc to include information about versions
* [HBASE-10141] - instead of putting expired store files thru compaction, just archive them
* [HBASE-10157] - Provide CP hook post log replay
* [HBASE-10164] - Allow heapsize of different units to be passed as HBASE_HEAPSIZE
* [HBASE-10173] - Need HFile version check in security coprocessors
* [HBASE-10175] - 2-thread ChaosMonkey steps on its own toes
* [HBASE-10202] - Documentation is lacking information about rolling-restart.sh script.
* [HBASE-10211] - Improve AccessControl documentation in hbase book
* [HBASE-10213] - Add read log size per second metrics for replication source
* [HBASE-10228] - Support setCellVisibility and setAuthorizations in Shell
* [HBASE-10229] - Support OperationAttributes in Increment and Append in Shell
* [HBASE-10239] - Improve determinism and debugability of TestAccessController
* [HBASE-10252] - Don't write back to WAL/memstore when Increment amount is zero (mostly for query rather than update intention)
* [HBASE-10263] - make LruBlockCache single/multi/in-memory ratio user-configurable and provide preemptive mode for in-memory type block
* [HBASE-10265] - Upgrade to commons-logging 1.1.3
* [HBASE-10277] - refactor AsyncProcess
* [HBASE-10289] - Avoid random port usage by default JMX Server. Create Custome JMX server
* [HBASE-10323] - Auto detect data block encoding in HFileOutputFormat
* [HBASE-10324] - refactor deferred-log-flush/Durability related interface/code/naming to align with changed semantic of the new write thread model
* [HBASE-10331] - Insure security tests use SecureTestUtil methods for grants
* [HBASE-10344] - Improve write performance by ignoring sync to hdfs when an asyncer's writes have been synced by other asyncer
* [HBASE-10346] - Add Documentation for stateless scanner
* [HBASE-10368] - Add Mutation.setWriteToWAL() back to 0.98
* [HBASE-10373] - Add more details info for ACL group in HBase book
* [HBASE-10389] - Add namespace help info in table related shell commands
* [HBASE-10395] - endTime won't be set in VerifyReplication if startTime is not set
* [HBASE-10419] - Add multiget support to PerformanceEvaluation
* [HBASE-10423] - Report back the message of split or rollback failure to the master
* [HBASE-10427] - clean up HRegionLocation/ServerName usage
* [HBASE-10430] - Support compressTags in shell for enabling tag encoding
* [HBASE-10471] - Remove HTD.isAsyncLogFlush() from trunk
* [HBASE-10479] - HConnection interface is public but is used internally, and contains a bunch of methods
* [HBASE-10487] - Avoid allocating new KeyValue and according bytes-copying for appended kvs which don't have existing values
* [HBASE-10498] - Add new APIs to load balancer interface
* [HBASE-10511] - Add latency percentiles on PerformanceEvaluation
* [HBASE-10518] - DirectMemoryUtils.getDirectMemoryUsage spams when none is configured
* [HBASE-10569] - Co-locate meta and master
* [HBASE-10570] - Allow overrides of Surefire secondPartForkMode and testFailureIgnore
* [HBASE-10589] - Reduce unnecessary TestRowProcessorEndpoint resource usage
* [HBASE-10590] - Update contents about tracing in the Reference Guide
* [HBASE-10591] - Sanity check table configuration in createTable
* [HBASE-10592] - Refactor PerformanceEvaluation tool
* [HBASE-10597] - IOEngine#read() should return the number of bytes transferred
* [HBASE-10599] - Replace System.currentMillis() with EnvironmentEdge.currentTimeMillis in memstore flusher and related places
* [HBASE-10603] - Deprecate RegionSplitter CLI tool
* [HBASE-10615] - Make LoadIncrementalHFiles skip reference files
* [HBASE-10638] - Improve error message when there is no region server available for move
* [HBASE-10641] - Configurable Bucket Sizes in bucketCache
* [HBASE-10663] - Some code cleanup of class Leases and ScannerListener.leaseExpired
* [HBASE-10678] - Make verifyrep tool implement toolrunner
* [HBASE-10690] - Drop Hadoop-1 support
* [HBASE-10693] - Correct declarations of Atomic* fields from 'volatile' to 'final'
* [HBASE-10744] - AM#CloseRegion no need to retry on FailedServerException
* [HBASE-10746] - Bump the version of HTrace to 3.0
* [HBASE-10752] - Port HBASE-10270 'Remove DataBlockEncoding from BlockCacheKey' to trunk
* [HBASE-10769] - hbase/bin/hbase-cleanup.sh has wrong usage string
* [HBASE-10771] - Primitive type put/get APIs in ByteRange
* [HBASE-10785] - Metas own location should be cached
* [HBASE-10788] - Add 99th percentile of latency in PE
* [HBASE-10797] - Add support for -h and --help to rolling_restart.sh and fix the usage string output
* [HBASE-10813] - Possible over-catch of exceptions
* [HBASE-10823] - Resolve LATEST_TIMESTAMP to current server time before scanning for ACLs
* [HBASE-10835] - DBE encode path improvements
* [HBASE-10842] - Some loggers not declared static final
* [HBASE-10861] - Extend ByteRange to create Mutable and Immutable ByteRange
* [HBASE-10871] - Indefinite OPEN/CLOSE wait on busy RegionServers
* [HBASE-10873] - Control number of regions assigned to backup masters
* [HBASE-10883] - Restrict the universe of labels and authorizations
* [HBASE-10884] - [REST] Do not disable block caching when scanning
* [HBASE-10885] - Support visibility expressions on Deletes
* [HBASE-10887] - tidy ThriftUtilities format
* [HBASE-10892] - [Shell] Add support for globs in user_permission
* [HBASE-10902] - Make Secure Bulk Load work across remote secure clusters
* [HBASE-10911] - ServerShutdownHandler#toString shows meaningless message
* [HBASE-10916] - [VisibilityController] Stackable ScanLabelGenerators
* [HBASE-10923] - Control where to put meta region
* [HBASE-10925] - Do not OOME, throw RowTooBigException instead
* [HBASE-10926] - Use global procedure to flush table memstore cache
* [HBASE-10934] - Provide Admin interface to abstract HBaseAdmin
* [HBASE-10950] - Add a configuration point for MaxVersion of Column Family
* [HBASE-10951] - Use PBKDF2 to generate test encryption keys in the shell
* [HBASE-10952] - [REST] Let the user turn off block caching if desired
* [HBASE-10960] - Enhance HBase Thrift 1 to include "append" and "checkAndPut" operations
* [HBASE-10984] - Add description about setting up htrace-zipkin to documentation
* [HBASE-11000] - Add autoflush option to PerformanceEvaluation
* [HBASE-11001] - Shell support for granting cell permissions for testing
* [HBASE-11002] - Shell support for changing cell visibility for testing
* [HBASE-11004] - Extend traces through FSHLog#sync
* [HBASE-11007] - BLOCKCACHE in schema descriptor seems not aptly named
* [HBASE-11008] - Align bulk load, flush, and compact to require Action.CREATE
* [HBASE-11026] - Provide option to filter out all rows in PerformanceEvaluation tool
* [HBASE-11044] - [Shell] Show groups for user in 'whoami' output
* [HBASE-11047] - Remove TimeoutMontior
* [HBASE-11048] - Support setting custom priority per client RPC
* [HBASE-11068] - Update code to use Admin factory method instead of constructor
* [HBASE-11074] - Have PE emit histogram stats as it runs rather than dump once at end of test
* [HBASE-11083] - ExportSnapshot should provide capability to limit bandwidth consumption
* [HBASE-11086] - Add htrace support for PerfEval
* [HBASE-11119] - Update ExportSnapShot to optionally not use a tmp file on external file system
* [HBASE-11123] - Upgrade instructions from 0.94 to 0.98
* [HBASE-11126] - Add RegionObserver pre hooks that operate under row lock
* [HBASE-11128] - Add -target option to ExportSnapshot to export with a different name
* [HBASE-11134] - Add a -list-snapshots option to SnapshotInfo
* [HBASE-11136] - Add permission check to roll WAL writer
* [HBASE-11137] - Add mapred.TableSnapshotInputFormat
* [HBASE-11151] - move tracing modules from hbase-server to hbase-common
* [HBASE-11167] - Avoid usage of java.rmi package Exception in MemStore
* [HBASE-11201] - Enable global procedure members to return values to procedure master
* [HBASE-11211] - LoadTestTool option for specifying number of regions per server
* [HBASE-11219] - HRegionServer#createRegionLoad() should reuse RegionLoad.Builder instance when called in a loop
* [HBASE-11220] - Add listeners to ServerManager and AssignmentManager
* [HBASE-11240] - Print hdfs pipeline when hlog's sync is slow
* [HBASE-11259] - Compression.java different compressions load system classpath differently causing errors
* [HBASE-11304] - Enable HBaseAdmin.execProcedure to return data from procedure execution
* [HBASE-11305] - Remove bunch of unused imports in HConnectionManager
* [HBASE-11315] - Keeping MVCC for configurable longer time
* [HBASE-11319] - No need to use favored node mapping initialization to find all regions
* [HBASE-11326] - Use an InputFormat for ExportSnapshot
* [HBASE-11331] - [blockcache] lazy block decompression
* [HBASE-11344] - Hide row keys and such from the web UIs
* [HBASE-11348] - Make frequency and sleep times of chaos monkeys configurable
* [HBASE-11349] - [Thrift] support authentication/impersonation
* [HBASE-11350] - [PE] Allow random value size
* [HBASE-11355] - a couple of callQueue related improvements
* [HBASE-11362] - Minor improvements to LoadTestTool and PerformanceEvaluation
* [HBASE-11370] - SSH doesn't need to scan meta if not using ZK for assignment
* [HBASE-11376] - Presplit table in IntegrationTestBigLinkedList's Generator tool
* [HBASE-11390] - PerformanceEvaluation: add an option to use a single connection
* [HBASE-11398] - Print the stripes' state with file size info
* [HBASE-11407] - hbase-client should not require Jackson for pure HBase queries be executed
* [HBASE-11415] - [PE] Dump config before running test
* [HBASE-11421] - HTableInterface javadoc correction
* [HBASE-11434] - [AccessController] Disallow inbound cells with reserved tags
* [HBASE-11436] - Support start Row and stop Row in HBase Export
* [HBASE-11437] - Modify cell tag handling code to treat the length as unsigned
* [HBASE-11438] - [Visibility Controller] Support UTF8 character as Visibility Labels
* [HBASE-11440] - Make KeyValueCodecWithTags as the default codec for replication in trunk
* [HBASE-11444] - Remove use of reflection for User#getShortName
* [HBASE-11446] - Reduce the frequency of RNG calls in SecureWALCellCodec#EncryptedKvEncoder
* [HBASE-11450] - Improve file size info in SnapshotInfo tool
* [HBASE-11452] - add getUserPermission feature in AccessControlClient as client API
* [HBASE-11473] - Add BaseWALObserver class
* [HBASE-11474] - [Thrift2] support authentication/impersonation
* [HBASE-11491] - Add an option to sleep randomly during the tests with the PE tool
* [HBASE-11497] - Expose RpcScheduling implementations as LimitedPrivate interfaces
* [HBASE-11513] - Combine SingleMultiple Queue RpcExecutor into a single class
* [HBASE-11516] - Track time spent in executing coprocessors in each region.
* [HBASE-11553] - Abstract visibility label related services into an interface
* [HBASE-11566] - make ExportSnapshot extendable by removing 'final'
* [HBASE-11583] - Refactoring out the configuration changes for enabling VisibilityLabels in the unit tests.
* [HBASE-11623] - mutateRowsWithLocks might require updatesLock.readLock with waitTime=0
* [HBASE-11630] - Refactor TestAdmin to use Admin interface instead of HBaseAdmin
* [HBASE-11631] - Wait a little till server is online in assigning meta
* [HBASE-11649] - Add shortcut commands to bin/hbase for test tools
* [HBASE-11650] - Write hbase.id to a temporary location and move into place
* [HBASE-11657] - Put HTable region methods in an interface
* [HBASE-11664] - Build broken - TestVisibilityWithCheckAuths
* [HBASE-11667] - Comment ClientScanner logic for NSREs.
* [HBASE-11674] - LoadIncrementalHFiles should be more verbose after unrecoverable error
* [HBASE-11679] - Replace "HTable" with "HTableInterface" where backwards-compatible
* [HBASE-11696] - Make CombinedBlockCache resizable.
* [HBASE-11697] - Improve the 'Too many blocks' message on UI blockcache status page
* [HBASE-11701] - Start and end of memstore flush log should be on the same level
* [HBASE-11702] - Better introspection of long running compactions
* [HBASE-11706] - Set versions for VerifyReplication
* [HBASE-11731] - Add option to only run a subset of the shell tests
* [HBASE-11748] - Cleanup and add pool usage tracing to Compression
* [HBASE-11749] - Better error logging when coprocessors loading has failed.
* [HBASE-11754] - [Shell] Record table property SPLITS_FILE in descriptor
* [HBASE-11757] - Provide a common base abstract class for both RegionObserver and MasterObserver
* [HBASE-11774] - Avoid allocating unnecessary tag iterators
* [HBASE-11777] - Find a way to set sequenceId on Cells on the server
* [HBASE-11790] - Bulk load should use HFileOutputFormat2 in all cases
* [HBASE-11805] - KeyValue to Cell Convert in WALEdit APIs
* [HBASE-11810] - Access SSL Passwords through Credential Provider API
* [HBASE-11821] - [ImportTSV] Abstract labels tags creation into pluggable Interface
* [HBASE-11825] - Create Connection and ConnectionManager
* [HBASE-11826] - Split each tableOrRegionName admin methods into two targetted methods
* [HBASE-11828] - callers of SeverName.valueOf should use equals and not ==
* [HBASE-11845] - HFile tool should implement Tool, disable blockcache by default
* [HBASE-11846] - HStore#assertBulkLoadHFileOk should log if a full HFile verification will be performed during a bulkload
* [HBASE-11847] - HFile tool should be able to print block headers
* [HBASE-11865] - Result implements CellScannable; rather it should BE a CellScanner
* [HBASE-11873] - Hbase Version CLI enhancement
* [HBASE-11877] - Make TableSplit more readable
* [HBASE-11891] - Introduce HBaseInterfaceAudience level to denote class names that appear in configs.
* [HBASE-11897] - Add append and remove peer table-cfs cmds for replication
** New Feature
* [HBASE-4089] - blockCache contents report
* [HBASE-6104] - Require EXEC permission to call coprocessor endpoints
* [HBASE-7667] - Support stripe compaction
* [HBASE-7840] - Enhance the java it framework to start & stop a distributed hbase & hadoop cluster
* [HBASE-8751] - Enable peer cluster to choose/change the ColumnFamilies/Tables it really want to replicate from a source cluster
* [HBASE-9047] - Tool to handle finishing replication when the cluster is offline
* [HBASE-10119] - Allow HBase coprocessors to clean up when they fail
* [HBASE-10151] - No-op HeapMemoryTuner
* [HBASE-10416] - Improvements to the import flow
* [HBASE-10881] - Support reverse scan in thrift2
* [HBASE-10935] - support snapshot policy where flush memstore can be skipped to prevent production cluster freeze
* [HBASE-11724] - Add to RWQueueRpcExecutor the ability to split get and scan handlers
* [HBASE-11885] - Provide a Dockerfile to easily build and run HBase from source
* [HBASE-11909] - Region count listed by HMaster UI and hbck are different
** Task
* [HBASE-4456] - [doc] Add a section about RS failover
* [HBASE-4920] - We need a mascot, a totem
* [HBASE-5697] - Audit HBase for usage of deprecated hadoop 0.20.x property names.
* [HBASE-6139] - Add troubleshooting section for CentOS 6.2 page allocation failure issue
* [HBASE-6192] - Document ACL matrix in the book
* [HBASE-7394] - Document security config requirements from HBASE-7357
* [HBASE-8035] - Add site target check to precommit tests
* [HBASE-8844] - Document the removal of replication state AKA start/stop_replication
* [HBASE-9580] - Document the meaning of @InterfaceAudience in hbase ref guide
* [HBASE-9733] - Book should have individual Disqus comment per page
* [HBASE-9875] - NamespaceJanitor chore is not used
* [HBASE-10134] - Fix findbug warning in VisibilityController
* [HBASE-10159] - Replaced deprecated interface Closeable
* [HBASE-10206] - Explain tags in the hbase book
* [HBASE-10246] - Wrap long lines in recently added source files
* [HBASE-10364] - Allow configuration option for parent znode in LoadTestTool
* [HBASE-10388] - Add export control notice in README
* [HBASE-10439] - Document how to configure REST server impersonation
* [HBASE-10473] - Add utility for adorning http Context
* [HBASE-10601] - Upgrade hadoop dependency to 2.3.0 release
* [HBASE-10609] - Remove filterKeyValue(Cell ignored) from FilterBase
* [HBASE-10612] - Remove unnecessary dependency on org.eclipse.jdt:core
* [HBASE-10670] - HBaseFsck#connect() should use new connection
* [HBASE-10700] - IntegrationTestWithCellVisibilityLoadAndVerify should allow current user to be the admin
* [HBASE-10740] - Upgrade zookeeper to 3.4.6 release
* [HBASE-10786] - If snapshot verification fails with 'Regions moved', the message should contain the name of region causing the failure
* [HBASE-10787] - TestHCM#testConnection* take too long
* [HBASE-10821] - Make ColumnInterpreter#getValue() abstract
* [HBASE-10824] - Enhance detection of protobuf generated code in line length check
* [HBASE-10889] - test-patch.sh should exclude thrift generated code from long line detection
* [HBASE-10906] - Change error log for NamingException in TableInputFormatBase to WARN level
* [HBASE-10912] - setUp / tearDown in TestSCVFWithMiniCluster should be done once per run
* [HBASE-10956] - Upgrade hadoop-2 dependency to 2.4.0
* [HBASE-11016] - Remove Filter#filterRow(List)
* [HBASE-11032] - Replace deprecated methods in FileSystem with their replacements
* [HBASE-11050] - Replace empty catch block in TestHLog#testFailedToCreateHLogIfParentRenamed with @Test(expected=)
* [HBASE-11076] - Update refguide on getting 0.94.x to run on hadoop 2.2.0+
* [HBASE-11090] - Backport HBASE-11083 ExportSnapshot should provide capability to limit bandwidth consumption
* [HBASE-11107] - Provide utility method equivalent to 0.92's Result.getBytes().getSize()
* [HBASE-11154] - Document how to use Reverse Scan API
* [HBASE-11199] - One-time effort to pretty-print the Docbook XML, to make further patch review easier
* [HBASE-11203] - Clean up javadoc and findbugs warnings in trunk
* [HBASE-11204] - Document bandwidth consumption limit feature for ExportSnapshot
* [HBASE-11227] - Mention 8- and 16-bit fixed-with encodings in OrderedBytes docstring
* [HBASE-11230] - Remove getRowOrBefore from HTableInterface and HTable
* [HBASE-11317] - Expand unit testing to cover Mockito and MRUnit and give more examples
* [HBASE-11364] - [BlockCache] Add a flag to cache data blocks in L1 if multi-tier cache
* [HBASE-11600] - DataInputputStream and DoubleOutputStream are no longer being used
* [HBASE-11604] - Disable co-locating meta/master by default
* [HBASE-11621] - Make MiniDFSCluster run faster
* [HBASE-11666] - Enforce JDK7 javac for builds on branch-1 and master
* [HBASE-11682] - Explain hotspotting
* [HBASE-11723] - Document all options of bin/hbase command
* [HBASE-11735] - Document Configurable Bucket Sizes in bucketCache
* [HBASE-11762] - Record the class name of Codec in WAL header
* [HBASE-11800] - Coprocessor service methods in HTableInterface should be annotated public
* [HBASE-11849] - Clean up orphaned private audience classes
* [HBASE-11858] - Audit regionserver classes that are missing InterfaceAudience
** Test
* [HBASE-8889] - TestIOFencing#testFencingAroundCompaction occasionally fails
* [HBASE-9928] - TestHRegion should clean up test-data directory upon completion
* [HBASE-9953] - PerformanceEvaluation: Decouple data size from client concurrency
* [HBASE-10044] - test-patch.sh should accept documents by known file extensions
* [HBASE-10130] - TestSplitLogManager#testTaskResigned fails sometimes
* [HBASE-10180] - TestByteBufferIOEngine#testByteBufferIOEngine occasionally fails
* [HBASE-10189] - Intermittent TestReplicationSyncUpTool failure
* [HBASE-10301] - TestAssignmentManagerOnCluster#testOpenCloseRacing fails intermittently
* [HBASE-10377] - Add test for HBASE-10370 Compaction in out-of-date Store causes region split failure
* [HBASE-10394] - Test for Replication with tags
* [HBASE-10406] - Column family option is not effective in IntegrationTestSendTraceRequests
* [HBASE-10408] - Intermittent TestDistributedLogSplitting#testLogReplayForDisablingTable failure
* [HBASE-10440] - integration tests fail due to nonce collisions
* [HBASE-10465] - TestZKPermissionsWatcher.testPermissionsWatcher fails sometimes
* [HBASE-10475] - TestRegionServerCoprocessorExceptionWithAbort may timeout due to concurrent lease removal
* [HBASE-10480] - TestLogRollPeriod#testWithEdits may fail due to insufficient waiting
* [HBASE-10543] - Two rare test failures with TestLogsCleaner and TestSplitLogWorker
* [HBASE-10635] - thrift#TestThriftServer fails due to TTL validity check
* [HBASE-10649] - TestMasterMetrics fails occasionally
* [HBASE-10764] - TestLoadIncrementalHFilesSplitRecovery#testBulkLoadPhaseFailure takes too long
* [HBASE-10767] - Load balancer may interfere with tests in TestHBaseFsck
* [HBASE-10774] - Restore TestMultiTableInputFormat
* [HBASE-10782] - Hadoop2 MR tests fail occasionally because of mapreduce.jobhistory.address is no set in job conf
* [HBASE-10828] - TestRegionObserverInterface#testHBase3583 should wait for all regions to be assigned
* [HBASE-10852] - TestDistributedLogSplitting#testDisallowWritesInRecovering occasionally fails
* [HBASE-10867] - TestRegionPlacement#testRegionPlacement occasionally fails
* [HBASE-10868] - TestAtomicOperation should close HRegion instance after each subtest
* [HBASE-10988] - Properly wait for server in TestThriftServerCmdLine
* [HBASE-11010] - TestChangingEncoding is unnecessarily slow
* [HBASE-11019] - incCount() method should be properly stubbed in HConnectionTestingUtility#getMockedConnectionAndDecorate()
* [HBASE-11037] - Race condition in TestZKBasedOpenCloseRegion
* [HBASE-11051] - checkJavacWarnings in test-patch.sh should bail out early if there is compilation error
* [HBASE-11057] - Improve TestShell coverage of grant and revoke comamnds
* [HBASE-11104] - IntegrationTestImportTsv#testRunFromOutputCommitter misses credential initialization
* [HBASE-11152] - test-patch.sh should be able to handle the case where $TERM is not defined
* [HBASE-11166] - Categorize tests in hbase-prefix-tree module
* [HBASE-11328] - testMoveRegion could fail
* [HBASE-11345] - Add an option not to restore cluster after an IT test
* [HBASE-11375] - Validate compile-protobuf profile in test-patch.sh
* [HBASE-11404] - TestLogLevel should stop the server at the end
* [HBASE-11443] - TestIOFencing#testFencingAroundCompactionAfterWALSync times out
* [HBASE-11615] - TestZKLessAMOnCluster.testForceAssignWhileClosing failed on Jenkins
* [HBASE-11713] - Adding hbase shell unit test coverage for visibility labels.
* [HBASE-11918] - TestVisibilityLabelsWithDistributedLogReplay#testAddVisibilityLabelsOnRSRestart sometimes fails due to VisibilityController initialization not being recognized
* [HBASE-11942] - Fix TestHRegionBusyWait
* [HBASE-11966] - Minor error in TestHRegion.testCheckAndMutate_WithCorrectValue()
** Umbrella
* [HBASE-7319] - Extend Cell usage through read path
* [HBASE-9945] - Coprocessor loading and execution improvements
* [HBASE-10909] - Abstract out ZooKeeper usage in HBase - phase 1
```
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