hbase/CHANGES.md

HBASE Changelog

Release 2.1.3 - Unreleased (as of 2019-02-04)

INCOMPATIBLE CHANGES:

JIRA	Summary	Priority	Component
HBASE-21684	Throw DNRIOE when connection or rpc client is closed	Major	asyncclient, Client

IMPROVEMENTS:

JIRA	Summary	Priority	Component
HBASE-21833	Use NettyAsyncFSWALConfigHelper.setEventLoopConfig to prevent creating too many netty event loop when executing TestHRegion	Minor	test
HBASE-21634	Print error message when user uses unacceptable values for LIMIT while setting quotas.	Minor	.
HBASE-21712	Make submit-patch.py python3 compatible	Minor	tooling
HBASE-21590	Optimize trySkipToNextColumn in StoreScanner a bit	Critical	Performance, Scanners
HBASE-21297	ModifyTableProcedure can throw TNDE instead of IOE in case of REGION_REPLICATION change	Minor	.
HBASE-21694	Add append_peer_exclude_tableCFs and remove_peer_exclude_tableCFs shell commands	Major	.
HBASE-21645	Perform sanity check and disallow table creation/modification with region replication < 1	Minor	.
HBASE-21662	Add append_peer_exclude_namespaces and remove_peer_exclude_namespaces shell commands	Major	.

BUG FIXES:

JIRA	Summary	Priority	Component
HBASE-21795	Client application may get stuck (time bound) if a table modify op is called immediately after split op	Critical	amv2
HBASE-21840	TestHRegionWithInMemoryFlush fails with NPE	Blocker	test
HBASE-21644	Modify table procedure runs infinitely for a table having region replication > 1	Critical	Admin
HBASE-21775	The BufferedMutator doesn't ever refresh region location cache	Major	Client
HBASE-21699	Create table failed when using SPLITS_FILE => 'splits.txt'	Blocker	Client, shell
HBASE-21535	Zombie Master detector is not working	Critical	master
HBASE-21754	ReportRegionStateTransitionRequest should be executed in priority executor	Major	.
HBASE-21475	Put mutation (having TTL set) added via co-processor is retrieved even after TTL expires	Major	Coprocessors
HBASE-21749	RS UI may throw NPE and make rs-status page inaccessible with multiwal and replication	Major	Replication, UI
HBASE-21746	Fix two concern cases in RegionMover	Major	.
HBASE-21732	Should call toUpperCase before using Enum.valueOf in some methods for ColumnFamilyDescriptor	Critical	Client
HBASE-21704	The implementation of DistributedHBaseCluster.getServerHoldingRegion is incorrect	Major	.
HBASE-20917	MetaTableMetrics#stop references uninitialized requestsMap for non-meta region	Major	meta, metrics
HBASE-21639	maxHeapUsage value not read properly from config during EntryBuffers initialization	Minor	.
HBASE-21225	Having RPC & Space quota on a table/Namespace doesn't allow space quota to be removed using 'NONE'	Major	.
HBASE-20220	[RSGroup] Check if table exists in the cluster before moving it to the specified regionserver group	Major	rsgroup
HBASE-21691	Fix flaky test TestRecoveredEdits	Major	.
HBASE-21683	Reset readsEnabled flag after successfully flushing the primary region	Critical	read replicas
HBASE-21630	[shell] Define ENDKEY == STOPROW (we have ENDROW)	Trivial	shell
HBASE-21547	Precommit uses master flaky list for other branches	Major	test

SUB-TASKS:

JIRA	Summary	Priority	Component
HBASE-21819	Generate CHANGES.md and RELEASENOTES.md for 2.1.3	Major	documentation, release
HBASE-21834	Set version as 2.1.3 in branch-2.1 in prep for first RC	Major	build, release
HBASE-21829	Use FutureUtils.addListener instead of calling whenComplete directly	Major	asyncclient, Client
HBASE-21832	Backport parent "HBASE-21595 Print thread's information and stack traces when RS is aborting forcibly" to branch-2.0/2.1	Minor	regionserver
HBASE-21828	Make sure we do not return CompletionException when locating region	Major	asyncclient, Client
HBASE-21764	Size of in-memory compaction thread pool should be configurable	Major	in-memory-compaction
HBASE-21402	Backport parent "HBASE-21325 Force to terminate regionserver when abort hang in somewhere"	Major	.
HBASE-21734	Some optimization in FilterListWithOR	Major	.
HBASE-21738	Remove all the CSLM#size operation in our memstore because it's an quite time consuming.	Critical	Performance
HBASE-19695	Handle disabled table for async client	Major	asyncclient, Client
HBASE-21727	Simplify documentation around client timeout	Minor	.
HBASE-21711	Remove references to git.apache.org/hbase.git	Critical	.
HBASE-19722	Meta query statistics metrics source	Critical	Coprocessors, meta, metrics, Operability
HBASE-21705	Should treat meta table specially for some methods in AsyncAdmin	Major	Admin, asyncclient, Client
HBASE-21663	Add replica scan support	Major	asyncclient, Client, read replicas
HBASE-21580	Support getting Hbck instance from AsyncConnection	Major	asyncclient, Client, hbck2
HBASE-21698	Move version in branch-2.1 from 2.1.2 to 2.1.3-SNAPSHOT	Major	release
HBASE-21682	Support getting from specific replica	Major	read replicas
HBASE-17356	Add replica get support	Major	Client

OTHER:

JIRA	Summary	Priority	Component
HBASE-21612	Add developer debug options in HBase Config for REST server	Minor	Operability, REST, scripts
HBASE-21791	Upgrade thrift dependency to 0.12.0	Blocker	Thrift
HBASE-21715	Do not throw UnsupportedOperationException in ProcedureFuture.get	Major	Client
HBASE-21731	Do not need to use ClusterConnection in IntegrationTestBigLinkedListWithVisibility	Major	.
HBASE-21685	Change repository urls to Gitbox	Critical	.
HBASE-21282	Upgrade to latest jetty 9.2 and 9.3 versions	Major	dependencies

Release 2.1.2 - Unreleased (as of 2018-12-29)

IMPROVEMENTS:

JIRA	Summary	Priority	Component
HBASE-21640	Remove the TODO when increment zero	Major	.
HBASE-21631	list_quotas should print human readable values for LIMIT	Minor	shell
HBASE-21635	Use maven enforcer to ban imports from illegal packages	Major	build
HBASE-21520	TestMultiColumnScanner cost long time when using ROWCOL bloom type	Major	test
HBASE-21590	Optimize trySkipToNextColumn in StoreScanner a bit	Critical	Performance, Scanners
HBASE-21554	Show replication endpoint classname for replication peer on master web UI	Minor	UI
HBASE-21549	Add shell command for serial replication peer	Major	.
HBASE-21567	Allow overriding configs starting up the shell	Major	shell
HBASE-21413	Empty meta log doesn't get split when restart whole cluster	Major	.
HBASE-21524	Unnecessary DEBUG log in ConnectionImplementation#isTableEnabled	Major	Client
HBASE-21511	Remove in progress snapshot check in SnapshotFileCache#getUnreferencedFiles	Minor	.
HBASE-21480	Taking snapshot when RS crashes prevent we bring the regions online	Major	snapshots
HBASE-21485	Add more debug logs for remote procedure execution	Major	proc-v2
HBASE-21388	No need to instantiate MemStoreLAB for master which not carry table	Major	.

BUG FIXES:

JIRA	Summary	Priority	Component
HBASE-21646	Flakey TestTableSnapshotInputFormat; DisableTable not completing...	Major	test
HBASE-21545	NEW_VERSION_BEHAVIOR breaks Get/Scan with specified columns	Major	API
HBASE-21629	draining_servers.rb is broken	Major	scripts
HBASE-21621	Reversed scan does not return expected number of rows	Critical	scan
HBASE-21620	Problem in scan query when using more than one column prefix filter in some cases.	Major	scan
HBASE-21618	Scan with the same startRow(inclusive=true) and stopRow(inclusive=false) returns one result	Critical	Client
HBASE-21610	numOpenConnections metric is set to -1 when zero server channel exist	Minor	metrics
HBASE-21498	Master OOM when SplitTableRegionProcedure new CacheConfig and instantiate a new BlockCache	Major	.
HBASE-21592	quota.addGetResult(r) throw NPE	Major	.
HBASE-21589	TestCleanupMetaWAL fails	Blocker	test, wal
HBASE-21582	If call HBaseAdmin#snapshotAsync but forget call isSnapshotFinished, then SnapshotHFileCleaner will skip to run every time	Major	.
HBASE-21568	Disable use of BlockCache for LoadIncrementalHFiles	Major	Client
HBASE-21453	Convert ReadOnlyZKClient to DEBUG instead of INFO	Major	logging, Zookeeper
HBASE-21559	The RestoreSnapshotFromClientTestBase related UT are flaky	Major	.
HBASE-21551	Memory leak when use scan with STREAM at server side	Blocker	regionserver
HBASE-21479	Individual tests in TestHRegionReplayEvents class are failing	Major	.
HBASE-21518	TestMasterFailoverWithProcedures is flaky	Major	.
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	Fix the wrong reference file path when restoring snapshots for tables with MOB columns	Major	.
HBASE-21492	CellCodec Written To WAL Before It's Verified	Critical	wal
HBASE-21507	Compaction failed when execute AbstractMultiFileWriter.beforeShipped() method	Major	regionserver
HBASE-21387	Race condition surrounding in progress snapshot handling in snapshot cache leads to loss of snapshot files	Major	snapshots
HBASE-21503	Replication normal source can get stuck due potential race conditions between source wal reader and wal provider initialization threads.	Blocker	Replication
HBASE-21440	Assign procedure on the crashed server is not properly interrupted	Major	.
HBASE-21468	separate workers for meta table is not working	Major	.
HBASE-21445	CopyTable by bulkload will write hfile into yarn's HDFS	Major	mapreduce
HBASE-21437	Bypassed procedure throw IllegalArgumentException when its state is WAITING_TIMEOUT	Major	.
HBASE-21439	StochasticLoadBalancer RegionLoads aren’t being used in RegionLoad cost functions	Major	Balancer
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	Custom Meta WAL Provider doesn't default to custom WAL Provider whose configuration value is outside the enums in Providers	Major	wal
HBASE-21438	TestAdmin2#testGetProcedures fails due to FailedProcedure inaccessible	Major	.
HBASE-21425	2.1.1 fails to start over 1.x data; namespace not assigned	Critical	amv2
HBASE-21407	Resolve NPE in backup Master UI	Minor	UI
HBASE-21424	Change flakies and nightlies so scheduled less often	Major	build
HBASE-21417	Pre commit build is broken due to surefire plugin crashes	Critical	build
HBASE-21371	Hbase unable to compile against Hadoop trunk (3.3.0-SNAPSHOT) due to license error	Major	.
HBASE-21356	bulkLoadHFile API should ensure that rs has the source hfile's write permission	Major	.
HBASE-21055	NullPointerException when balanceOverall() but server balance info is null	Major	Balancer

TESTS:

JIRA	Summary	Priority	Component
HBASE-20136	TestKeyValue misses ClassRule and Category annotations	Minor	.

SUB-TASKS:

JIRA	Summary	Priority	Component
HBASE-21401	Sanity check when constructing the KeyValue	Critical	regionserver
HBASE-21570	Add write buffer periodic flush support for AsyncBufferedMutator	Major	asyncclient, Client
HBASE-21566	Release notes and changes for 2.0.4RC0 and 2.1.2RC0	Major	release
HBASE-21490	WALProcedure may remove proc wal files still with active procedures	Major	proc-v2
HBASE-21377	Add debug log for procedure stack id related operations	Major	proc-v2
HBASE-21473	RowIndexSeekerV1 may return cell with extra two \x00\x00 bytes which has no tags	Major	.
HBASE-21423	Procedures for meta table/region should be able to execute in separate workers	Major	.
HBASE-21376	Add some verbose log to MasterProcedureScheduler	Major	logging, proc-v2
HBASE-21442	Update branch-2.1 for next development cycle	Major	build
HBASE-21421	Do not kill RS if reportOnlineRegions fails	Major	.
HBASE-21314	The implementation of BitSetNode is not efficient	Major	proc-v2
HBASE-21395	Abort split/merge procedure if there is a table procedure of the same table going on	Major	.
HBASE-21351	The force update thread may have race with PE worker when the procedure is rolling back	Critical	proc-v2
HBASE-21237	Use CompatRemoteProcedureResolver to dispatch open/close region requests to RS	Blocker	.
HBASE-21322	Add a scheduleServerCrashProcedure() API to HbckService	Major	hbck2
HBASE-21375	Revisit the lock and queue implementation in MasterProcedureScheduler	Major	proc-v2

OTHER:

JIRA	Summary	Priority	Component
HBASE-18735	Provide a fast mechanism for shutting down mini cluster	Major	.
HBASE-21517	Move the getTableRegionForRow method from HMaster to TestMaster	Major	test

Release 2.1.1 - Released 2018-10-31

INCOMPATIBLE CHANGES:

JIRA	Summary	Priority	Component
HBASE-21158	Empty qualifier cell should not be returned if it does not match QualifierFilter	Critical	Filters
HBASE-21223	[amv2] Remove abort_procedure from shell	Critical	amv2, hbck2, shell
HBASE-20884	Replace usage of our Base64 implementation with java.util.Base64	Major	.

NEW FEATURES:

JIRA	Summary	Priority	Component
HBASE-20649	Validate HFiles do not have PREFIX_TREE DataBlockEncoding	Minor	Operability, tooling

IMPROVEMENTS:

JIRA	Summary	Priority	Component
HBASE-21385	HTable.delete request use rpc call directly instead of AsyncProcess	Major	.
HBASE-21145	Backport "HBASE-21126 Add ability for HBase Canary to ignore a configurable number of ZooKeeper down nodes" to branch-2.1	Minor	canary, Zookeeper
HBASE-21263	Mention compression algorithm along with other storefile details	Minor	.
HBASE-21290	No need to instantiate BlockCache for master which not carry table	Major	.
HBASE-21251	Refactor RegionMover	Major	Operability
HBASE-21303	[shell] clear_deadservers with no args fails	Major	.
HBASE-21299	List counts of actual region states in master UI tables section	Major	UI
HBASE-21289	Remove the log "'hbase.regionserver.maxlogs' was deprecated." in AbstractFSWAL	Minor	.
HBASE-21185	WALPrettyPrinter: Additional useful info to be printed by wal printer tool, for debugability purposes	Minor	Operability
HBASE-21103	nightly test cache of yetus install needs to be more thorough in verification	Major	test
HBASE-20857	JMX - add Balancer status = enabled / disabled	Major	API, master, metrics, REST, tooling, Usability
HBASE-21164	reportForDuty to spew less log if master is initializing	Minor	regionserver
HBASE-20307	LoadTestTool prints too much zookeeper logging	Minor	tooling
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-21157	Split TableInputFormatScan to individual tests	Minor	test
HBASE-21153	Shaded client jars should always build in relevant phase to avoid confusion	Major	build
HBASE-20749	Upgrade our use of checkstyle to 8.6+	Minor	build, community
HBASE-20387	flaky infrastructure should work for all branches	Critical	test
HBASE-20469	Directory used for sidelining old recovered edits files should be made configurable	Minor	.
HBASE-20979	Flaky test reporting should specify what JSON it needs and handle HTTP errors	Minor	test
HBASE-20985	add two attributes when we do normalization	Major	.
HBASE-20965	Separate region server report requests to new handlers	Major	Performance
HBASE-20986	Separate the config of block size when we do log splitting and write Hlog	Major	.
HBASE-20856	PITA having to set WAL provider in two places	Minor	Operability, wal
HBASE-20935	HStore.removeCompactedFiles should log in case it is unable to delete a file	Minor	.
HBASE-20873	Update doc for Endpoint-based Export	Minor	documentation

BUG FIXES:

JIRA	Summary	Priority	Component
HBASE-21380	TestRSGroups failing	Major	.
HBASE-21391	RefreshPeerProcedure should also wait master initialized before executing	Major	Replication
HBASE-21342	FileSystem in use may get closed by other bulk load call in secure bulkLoad	Major	.
HBASE-21349	Cluster is going down but CatalogJanitor and Normalizer try to run and fail noisely	Minor	.
HBASE-21355	HStore's storeSize is calculated repeatedly which causing the confusing region split	Blocker	regionserver
HBASE-21334	TestMergeTableRegionsProcedure is flakey	Major	amv2, proc-v2, test
HBASE-21178	[BC break] : Get and Scan operation with a custom converter_class not working	Critical	shell
HBASE-21242	[amv2] Miscellaneous minor log and assign procedure create improvements	Minor	amv2, Operability
HBASE-21348	Fix failing TestRegionBypass, broke by HBASE-21291	Major	hbck2
HBASE-21345	[hbck2] Allow version check to proceed even though master is 'initializing'.	Major	hbck2
HBASE-21200	Memstore flush doesn't finish because of seekToPreviousRow() in memstore scanner.	Critical	Scanners
HBASE-21292	IdLock.getLockEntry() may hang if interrupted	Major	.
HBASE-21335	Change the default wait time of HBCK2 tool	Critical	.
HBASE-21291	Add a test for bypassing stuck state-machine procedures	Major	.
HBASE-21327	Fix minor logging issue where we don't report servername if no associated SCP	Trivial	amv2
HBASE-21320	[canary] Cleanup of usage and add commentary	Major	canary
HBASE-21266	Not running balancer because processing dead regionservers, but empty dead rs list	Major	.
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-21271	[amv2] Don't throw UnsupportedOperationException when rollback called on Assign/Unassign; spiral of death	Major	amv2
HBASE-21259	[amv2] Revived deadservers; recreated serverstatenode	Critical	amv2
HBASE-21280	Add anchors for each heading in UI	Trivial	UI, Usability
HBASE-20764	build broken when latest commit is gpg signed	Critical	build
HBASE-21213	[hbck2] bypass leaves behind state in RegionStates when assign/unassign	Major	amv2, hbck2
HBASE-18549	Unclaimed replication queues can go undetected	Critical	Replication
HBASE-21248	Implement exponential backoff when retrying for ModifyPeerProcedure	Major	proc-v2, Replication
HBASE-21196	HTableMultiplexer clears the meta cache after every put operation	Critical	Performance
HBASE-19418	RANGE_OF_DELAY in PeriodicMemstoreFlusher should be configurable.	Minor	.
HBASE-18451	PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request	Major	regionserver
HBASE-21228	Memory leak since AbstractFSWAL caches Thread object and never clean later	Critical	wal
HBASE-21232	Show table state in Tables view on Master home page	Major	Operability, UI
HBASE-21212	Wrong flush time when update flush metric	Minor	.
HBASE-21208	Bytes#toShort doesn't work without unsafe	Critical	.
HBASE-20704	Sometimes some compacted storefiles are not archived on region close	Critical	Compaction
HBASE-21203	TestZKMainServer#testCommandLineWorks won't pass with default 4lw whitelist	Minor	test, Zookeeper
HBASE-21206	Scan with batch size may return incomplete cells	Critical	scan
HBASE-21182	Failed to execute start-hbase.sh	Major	.
HBASE-21179	Fix the number of actions in responseTooSlow log	Major	logging, rpc
HBASE-21174	[REST] Failed to parse empty qualifier in TableResource#getScanResource	Major	REST
HBASE-21181	Use the same filesystem for wal archive directory and wal directory	Major	.
HBASE-21144	AssignmentManager.waitForAssignment is not stable	Major	amv2, test
HBASE-21143	Update findbugs-maven-plugin to 3.0.4	Major	pom
HBASE-21171	[amv2] Tool to parse a directory of MasterProcWALs standalone	Major	amv2, test
HBASE-21001	ReplicationObserver fails to load in HBase 2.0.0	Major	.
HBASE-20741	Split of a region with replicas creates all daughter regions and its replica in same server	Major	read replicas
HBASE-21127	TableRecordReader need to handle cursor result too	Major	.
HBASE-20892	[UI] Start / End keys are empty on table.jsp	Major	.
HBASE-21132	return wrong result in rest multiget	Major	.
HBASE-20940	HStore.cansplit should not allow split to happen if it has references	Major	.
HBASE-20968	list_procedures_test fails due to no matching regex	Major	shell, test
HBASE-21030	Correct javadoc for append operation	Minor	documentation
HBASE-21088	HStoreFile should be closed in HStore#hasReferences	Major	.
HBASE-21120	MoveRegionProcedure makes no progress; goes to STUCK	Major	amv2
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	[amv2] Worker terminating UNNATURALLY during MoveRegionProcedure	Critical	amv2
HBASE-21078	[amv2] CODE-BUG NPE in RTP doing Unassign	Major	amv2
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	Remove the waitUntilAllRegionsAssigned call after split in TestTruncateTableProcedure	Major	test
HBASE-20614	REST scan API with incorrect filter text file throws HTTP 503 Service Unavailable error	Minor	REST
HBASE-21041	Memstore's heap size will be decreased to minus zero after flush	Major	.
HBASE-21031	Memory leak if replay edits failed during region opening	Major	.
HBASE-21032	ScanResponses contain only one cell each	Major	Performance, Scanners
HBASE-20705	Having RPC Quota on a table prevents Space quota to be recreated/removed	Major	.
HBASE-21058	Nightly tests for branches 1 fail to build ref guide	Major	documentation
HBASE-21074	JDK7 branches need to pass "-Dhttps.protocols=TLSv1.2" to maven when building	Major	build, community, test
HBASE-21062	WALFactory has misleading notion of "default"	Major	wal
HBASE-21047	Object creation of StoreFileScanner thru constructor and close may leave refCount to -1	Major	.
HBASE-21005	Maven site configuration causes downstream projects to get a directory named ${project.basedir}	Minor	build
HBASE-21029	Miscount of memstore's heap/offheap size if same cell was put	Major	.
HBASE-20981	Rollback stateCount accounting thrown-off when exception out of rollbackState	Major	amv2
HBASE-21018	RS crashed because AsyncFS was unable to update HDFS data encryption key	Critical	wal
HBASE-21007	Memory leak in HBase rest server	Critical	REST
HBASE-20538	Upgrade our hadoop versions to 2.7.7 and 3.0.3	Critical	java, security
HBASE-20565	ColumnRangeFilter combined with ColumnPaginationFilter can produce incorrect result since 1.4	Major	Filters
HBASE-20870	Wrong HBase root dir in ITBLL's Search Tool	Minor	integration tests
HBASE-20869	Endpoint-based Export use incorrect user to write to destination	Major	Coprocessors
HBASE-20865	CreateTableProcedure is stuck in retry loop in CREATE_TABLE_WRITE_FS_LAYOUT state	Major	amv2
HBASE-19572	RegionMover should use the configured default port number and not the one from HConstants	Major	.
HBASE-20697	Can't cache All region locations of the specify table by calling table.getRegionLocator().getAllRegionLocations()	Major	meta

TESTS:

JIRA	Summary	Priority	Component
HBASE-21261	Add log4j.properties for hbase-rsgroup tests	Trivial	.
HBASE-21097	Flush pressure assertion may fail in testFlushThroughputTuning	Major	regionserver
HBASE-21161	Enable the test added in HBASE-20741 that was removed accidentally	Minor	.
HBASE-21076	TestTableResource fails with NPE	Major	REST, test
HBASE-20907	Fix Intermittent failure on TestProcedurePriority	Major	.
HBASE-20838	Include hbase-server in precommit test if CommonFSUtils is changed	Major	.

SUB-TASKS:

JIRA	Summary	Priority	Component
HBASE-21398	Copy down docs, amend to suite branch-2.1, and then commit	Major	.
HBASE-21397	Set version to 2.1.1 on branch-2.1 in prep for first RC	Major	.
HBASE-20973	ArrayIndexOutOfBoundsException when rolling back procedure	Critical	amv2
HBASE-21384	Procedure with holdlock=false should not be restored lock when restarts	Blocker	.
HBASE-21364	Procedure holds the lock should put to front of the queue after restart	Blocker	.
HBASE-21215	Figure how to invoke hbck2; make it easy to find	Major	amv2, hbck2
HBASE-21372	Set hbase.assignment.maximum.attempts to Long.MAX	Major	amv2
HBASE-21363	Rewrite the buildingHoldCleanupTracker method in WALProcedureStore	Major	proc-v2
HBASE-21338	[balancer] If balancer is an ill-fit for cluster size, it gives little indication	Major	Balancer, Operability
HBASE-21192	Add HOW-TO repair damaged AMv2.	Major	amv2
HBASE-21073	"Maintenance mode" master	Major	amv2, hbck2, master
HBASE-21354	Procedure may be deleted improperly during master restarts resulting in 'Corrupt'	Major	.
HBASE-21321	Backport HBASE-21278 to branch-2.1 and branch-2.0	Critical	.
HBASE-21336	Simplify the implementation of WALProcedureMap	Major	proc-v2
HBASE-21323	Should not skip force updating for a sub procedure even if it has been finished	Major	proc-v2
HBASE-21075	Confirm that we can (rolling) upgrade from 2.0.x and 2.1.x to 2.2.x after HBASE-20881	Blocker	amv2, proc-v2
HBASE-21288	HostingServer in UnassignProcedure is not accurate	Major	amv2, Balancer
HBASE-20716	Unsafe access cleanup	Critical	Performance
HBASE-21310	Split TestCloneSnapshotFromClient	Major	test
HBASE-21311	Split TestRestoreSnapshotFromClient	Major	test
HBASE-21315	The getActiveMinProcId and getActiveMaxProcId of BitSetNode are incorrect if there are no active procedure	Major	.
HBASE-21309	Increase the waiting timeout for TestProcedurePriority	Major	test
HBASE-21254	Need to find a way to limit the number of proc wal files	Critical	proc-v2
HBASE-21250	Refactor WALProcedureStore and add more comments for better understanding the implementation	Major	proc-v2
HBASE-19275	TestSnapshotFileCache never worked properly	Major	.
HBASE-21249	Add jitter for ProcedureUtil.getBackoffTimeMs	Major	proc-v2
HBASE-21233	Allow the procedure implementation to skip persistence of the state after a execution	Major	Performance, proc-v2
HBASE-21214	[hbck2] setTableState just sets hbase:meta state, not in-memory state	Major	amv2, hbck2
HBASE-21210	Add bypassProcedure() API to HBCK2	Major	hbase-operator-tools, hbck2
HBASE-21023	Add bypassProcedureToCompletion() API to HbckService	Major	hbck2
HBASE-21156	[hbck2] Queue an assign of hbase:meta and bulk assign/unassign	Critical	hbck2
HBASE-21169	Initiate hbck2 tool in hbase-operator-tools repo	Major	hbck2
HBASE-21191	Add a holding-pattern if no assign for meta or namespace (Can happen if masterprocwals have been cleared).	Major	amv2
HBASE-21172	Reimplement the retry backoff logic for ReopenTableRegionsProcedure	Major	amv2, proc-v2
HBASE-21189	flaky job should gather machine stats	Minor	test
HBASE-21190	Log files and count of entries in each as we load from the MasterProcWAL store	Major	amv2
HBASE-21083	Introduce a mechanism to bypass the execution of a stuck procedure	Major	amv2
HBASE-20941	Create and implement HbckService in master	Major	.
HBASE-21072	Block out HBCK1 in hbase2	Major	hbck
HBASE-21093	Move TestCreateTableProcedure.testMRegions to a separated file	Major	test
HBASE-21094	Remove the explicit timeout config for TestTruncateTableProcedure	Major	test
HBASE-21050	Exclusive lock may be held by a SUCCESS state procedure forever	Major	amv2
HBASE-21044	Disable flakey TestShell list_procedures	Major	test
HBASE-20975	Lock may not be taken or released while rolling back procedure	Major	amv2
HBASE-21025	Add cache for TableStateManager	Major	.
HBASE-21012	Revert the change of serializing TimeRangeTracker	Critical	.
HBASE-20813	Remove RPC quotas when the associated table/Namespace is dropped off	Minor	.
HBASE-20885	Remove entry for RPC quota from hbase:quota when RPC quota is removed.	Minor	.
HBASE-20893	Data loss if splitting region while ServerCrashProcedure executing	Major	.
HBASE-19369	HBase Should use Builder Pattern to Create Log Files while using WAL on Erasure Coding	Major	.
HBASE-20939	There will be race when we call suspendIfNotReady and then throw ProcedureSuspendedException	Critical	amv2
HBASE-20921	Possible NPE in ReopenTableRegionsProcedure	Major	amv2
HBASE-20938	Set version to 2.1.1-SNAPSHOT for branch-2.1	Major	build
HBASE-20867	RS may get killed while master restarts	Major	.
HBASE-20878	Data loss if merging regions while ServerCrashProcedure executing	Critical	amv2
HBASE-20846	Restore procedure locks when master restarts	Major	.
HBASE-20914	Trim Master memory usage	Major	master
HBASE-20853	Polish "Add defaults to Table Interface so Implementors don't have to"	Major	API
HBASE-20875	MemStoreLABImp::copyIntoCell uses 7% CPU when writing	Major	Performance
HBASE-20860	Merged region's RIT state may not be cleaned after master restart	Major	.
HBASE-20847	The parent procedure of RegionTransitionProcedure may not have the table lock	Major	proc-v2, Region Assignment

OTHER:

JIRA	Summary	Priority	Component
HBASE-20152	[AMv2] DisableTableProcedure versus ServerCrashProcedure	Major	amv2
HBASE-20540	[umbrella] Hadoop 3 compatibility	Major	.
HBASE-21294	[2.1] Update bouncycastle dependency.	Major	dependencies, test
HBASE-21198	Exclude dependency on net.minidev:json-smart	Major	.
HBASE-21114	website should have a copy of 2.1 release docs	Major	community, documentation
HBASE-21287	JVMClusterUtil Master initialization wait time not configurable	Major	test
HBASE-21168	BloomFilterUtil uses hardcoded randomness	Trivial	.
HBASE-21125	Backport 'HBASE-20942 Improve RpcServer TRACE logging' to branch-2.1	Major	Operability
HBASE-20482	Print a link to the ref guide chapter for the shell during startup	Minor	documentation, shell

Release 2.1.0 - Released 2018-07-22

INCOMPATIBLE CHANGES:

JIRA	Summary	Priority	Component
HBASE-20691	Storage policy should allow deferring to HDFS	Blocker	Filesystem Integration, wal
HBASE-20270	Turn off command help that follows all errors in shell	Major	shell
HBASE-20501	Change the Hadoop minimum version to 2.7.1	Blocker	community, documentation
HBASE-20406	HBase Thrift HTTP - Shouldn't handle TRACE/OPTIONS methods	Major	security, Thrift
HBASE-20159	Support using separate ZK quorums for client	Major	Client, Operability, Zookeeper
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	Modify pre-upgrade coprocessor validator to support table level coprocessors	Major	Coprocessors
HBASE-15809	Basic Replication WebUI	Critical	Replication, UI
HBASE-19735	Create a minimal "client" tarball installation	Major	build, Client
HBASE-20656	Validate pre-2.0 coprocessors against HBase 2.0+	Major	tooling
HBASE-20592	Create a tool to verify tables do not have prefix tree encoding	Minor	Operability, tooling
HBASE-20046	Reconsider the implementation for serial replication	Major	Replication
HBASE-19397	Design procedures for ReplicationManager to notify peer change event from master	Major	proc-v2, Replication

IMPROVEMENTS:

JIRA	Summary	Priority	Component
HBASE-20806	Split style journal for flushes and compactions	Minor	.
HBASE-20474	Show non-RPC tasks on master/regionserver Web UI by default	Major	UI
HBASE-20826	Truncate responseInfo attributes on RpcServer WARN messages	Major	rpc
HBASE-20450	Provide metrics for number of total active, priority and replication rpc handlers	Major	metrics
HBASE-20810	Include the procedure id in the exception message in HBaseAdmin for better debugging	Major	Admin, proc-v2
HBASE-20040	Master UI should include "Cluster Key" needed to use the cluster as a replication sink	Minor	Replication, Usability
HBASE-20095	Redesign single instance pool in CleanerChore	Critical	.
HBASE-19164	Avoid UUID.randomUUID in tests	Major	test
HBASE-20739	Add priority for SCP	Major	Recovery
HBASE-20737	put collection into ArrayList instead of addAll function	Trivial	.
HBASE-20695	Implement table level RegionServer replication metrics	Minor	metrics
HBASE-20733	QABot should run checkstyle tests if the checkstyle configs change	Minor	build, community
HBASE-20625	refactor some WALCellCodec related code	Minor	wal
HBASE-19852	HBase Thrift 1 server SPNEGO Improvements	Major	Thrift
HBASE-20579	Improve snapshot manifest copy in ExportSnapshot	Minor	mapreduce
HBASE-20444	Improve version comparison logic for HBase specific version string and add unit tests	Major	util
HBASE-20594	provide utility to compare old and new descriptors	Major	.
HBASE-20640	TestQuotaGlobalsSettingsBypass missing test category and ClassRule	Critical	test
HBASE-20478	move import checks from hbaseanti to checkstyle	Minor	test
HBASE-20548	Master fails to startup on large clusters, refreshing block distribution	Major	.
HBASE-20488	PE tool prints full name in help message	Minor	shell
HBASE-20567	Pass both old and new descriptors to pre/post hooks of modify operations for table and namespace	Major	.
HBASE-20545	Improve performance of BaseLoadBalancer.retainAssignment	Major	Balancer
HBASE-16191	Add stop_regionserver and stop_master to shell	Major	.
HBASE-20536	Make TestRegionServerAccounting stable and it should not use absolute number	Minor	.
HBASE-20523	PE tool should support configuring client side buffering sizes	Minor	.
HBASE-20527	Remove unused code in MetaTableAccessor	Trivial	.
HBASE-20507	Do not need to call recoverLease on the broken file when we fail to create a wal writer	Major	wal
HBASE-20484	Remove the unnecessary autoboxing in FilterListBase	Trivial	.
HBASE-20327	When qualifier is not specified, append and incr operation do not work (shell)	Minor	shell
HBASE-20389	Move website building flags into a profile	Minor	build, website
HBASE-20379	shadedjars yetus plugin should add a footer link	Major	test
HBASE-20243	[Shell] Add shell command to create a new table by cloning the existent table	Minor	shell
HBASE-20286	Improving shell command compaction_state	Minor	shell
HBASE-19488	Move to using Apache commons CollectionUtils	Trivial	.
HBASE-20197	Review of ByteBufferWriterOutputStream.java	Minor	.
HBASE-20047	AuthenticationTokenIdentifier should provide a toString	Minor	Usability
HBASE-19024	Configurable default durability for synchronous WAL	Critical	wal
HBASE-19389	Limit concurrency of put with dense (hundreds) columns to prevent write handler exhausted	Critical	Performance
HBASE-20186	Improve RSGroupBasedLoadBalancer#balanceCluster() to be more efficient when calculating cluster state for each rsgroup	Minor	rsgroup
HBASE-19449	Minor logging change in HFileArchiver	Trivial	.
HBASE-20120	Remove some unused classes/ java files from hbase-server	Minor	.

BUG FIXES:

JIRA	Summary	Priority	Component
HBASE-20854	Wrong retries number in RpcRetryingCaller's log message	Minor	Client, logging
HBASE-20784	Will lose the SNAPSHOT suffix if we get the version of RS from ServerManager	Minor	master, UI
HBASE-20822	TestAsyncNonMetaRegionLocator is flakey	Major	asyncclient
HBASE-20808	Wrong shutdown order between Chores and ChoreService	Minor	.
HBASE-20789	TestBucketCache#testCacheBlockNextBlockMetadataMissing is flaky	Major	.
HBASE-20829	Remove the addFront assertion in MasterProcedureScheduler.doAdd	Major	Replication
HBASE-20825	Fix pre and post hooks of CloneSnapshot and RestoreSnapshot for Access checks	Major	security
HBASE-20812	Add defaults to Table Interface so implementors don't have to	Major	.
HBASE-20817	Infinite loop when executing ReopenTableRegionsProcedure	Blocker	Region Assignment
HBASE-20792	info:servername and info:sn inconsistent for OPEN region	Blocker	Region Assignment
HBASE-20769	getSplits() has a out of bounds problem in TableSnapshotInputFormatImpl	Major	.
HBASE-20732	Shutdown scan pool when master is stopped.	Minor	.
HBASE-20785	NPE getting metrics in PE testing scans	Major	Performance
HBASE-20795	Allow option in BBKVComparator.compare to do comparison without sequence id	Major	.
HBASE-20777	RpcConnection could still remain opened after we shutdown the NettyRpcServer	Major	rpc
HBASE-20403	Prefetch sometimes doesn't work with encrypted file system	Major	.
HBASE-20635	Support to convert the shaded user permission proto to client user permission object	Major	.
HBASE-20778	Make it so WALPE runs on DFS	Major	test
HBASE-20775	TestMultiParallel is flakey	Major	Region Assignment
HBASE-20752	Make sure the regions are truly reopened after ReopenTableRegionsProcedure	Major	proc-v2
HBASE-18622	Mitigate API compatibility concerns between branch-1 and branch-2	Blocker	API
HBASE-20767	Always close hbaseAdmin along with connection in HBTU	Major	test
HBASE-20642	IntegrationTestDDLMasterFailover throws 'InvalidFamilyOperationException	Major	.
HBASE-20742	Always create WAL directory for region server	Major	wal
HBASE-20708	Remove the usage of RecoverMetaProcedure in master startup	Blocker	proc-v2, Region Assignment
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	IntegrationTestDriver fails after HADOOP-15406 due to missing hamcrest-core	Major	integration tests
HBASE-20561	The way we stop a ReplicationSource may cause the RS down	Major	Replication
HBASE-19377	Compatibility checker complaining about hash collisions	Major	community
HBASE-20689	Docker fails to install rubocop for precommit	Blocker	build
HBASE-20707	Move MissingSwitchDefault check from checkstyle to error-prone	Major	build
HBASE-20699	QuotaCache should cancel the QuotaRefresherChore service inside its stop()	Major	.
HBASE-20590	REST Java client is not able to negotiate with the server in the secure mode	Critical	REST, security
HBASE-20683	Incorrect return value for PreUpgradeValidator	Critical	.
HBASE-20684	org.apache.hadoop.hbase.client.Scan#setStopRow javadoc uses incorrect method	Trivial	Client, documentation
HBASE-20678	NPE in ReplicationSourceManager#NodeFailoverWorker	Minor	.
HBASE-20670	NPE in HMaster#isInMaintenanceMode	Minor	.
HBASE-20634	Reopen region while server crash can cause the procedure to be stuck	Critical	.
HBASE-12882	Log level for org.apache.hadoop.hbase package should be configurable	Major	.
HBASE-20668	Avoid permission change if ExportSnapshot's copy fails	Major	.
HBASE-18116	Replication source in-memory accounting should not include bulk transfer hfiles	Major	Replication
HBASE-20602	hbase.master.quota.observer.ignore property seems to be not taking effect	Minor	documentation
HBASE-20664	Variable shared across multiple threads	Major	.
HBASE-20659	Implement a reopen table regions procedure	Major	.
HBASE-20582	Bump up JRuby version because of some reported vulnerabilities	Major	dependencies, shell
HBASE-20533	Fix the flaky TestAssignmentManagerMetrics	Major	.
HBASE-20597	Use a lock to serialize access to a shared reference to ZooKeeperWatcher in HBaseReplicationEndpoint	Minor	Replication
HBASE-20633	Dropping a table containing a disable violation policy fails to remove the quota upon table delete	Major	.
HBASE-20645	Fix security_available method in security.rb	Major	.
HBASE-20612	TestReplicationKillSlaveRSWithSeparateOldWALs sometimes fail because it uses an expired cluster conn	Major	.
HBASE-20648	HBASE-19364 "Truncate_preserve fails with table when replica region > 1" for master branch	Major	.
HBASE-20588	Space quota change after quota violation doesn't seem to take in effect	Major	regionserver
HBASE-20616	TruncateTableProcedure is stuck in retry loop in TRUNCATE_TABLE_CREATE_FS_LAYOUT state	Major	amv2
HBASE-20638	nightly source artifact testing should fail the stage if it's going to report an error on jira	Major	test
HBASE-20624	Race in ReplicationSource which causes walEntryFilter being null when creating new shipper	Major	Replication
HBASE-20601	Add multiPut support and other miscellaneous to PE	Minor	tooling
HBASE-20627	Relocate RS Group pre/post hooks from RSGroupAdminServer to RSGroupAdminEndpoint	Major	.
HBASE-20591	nightly job doesn't respect maven options	Critical	test
HBASE-20560	Revisit the TestReplicationDroppedTables ut	Major	.
HBASE-20571	JMXJsonServlet generates invalid JSON if it has NaN in metrics	Major	UI
HBASE-20585	Need to clear peer map when clearing MasterProcedureScheduler	Major	proc-v2
HBASE-20457	Return immediately for a scan rpc call when we want to switch from pread to stream	Major	scan
HBASE-20447	Only fail cacheBlock if block collisions aren't related to next block metadata	Major	BlockCache, BucketCache
HBASE-20544	downstream HBaseTestingUtility fails with invalid port	Blocker	test
HBASE-20004	Client is not able to execute REST queries in a secure cluster	Minor	REST, security
HBASE-20475	Fix the flaky TestReplicationDroppedTables unit test.	Major	.
HBASE-20554	"WALs outstanding" message from CleanerChore is noisy	Trivial	.
HBASE-20204	Add locking to RefreshFileConnections in BucketCache	Major	BucketCache
HBASE-20485	Copy constructor of Scan doesn't copy the readType and replicaId	Minor	.
HBASE-20543	Fix the flaky TestThriftHttpServer	Major	.
HBASE-20521	TableOutputFormat.checkOutputSpecs conf checking sequence cause pig script run fail	Major	mapreduce
HBASE-20500	[rsgroup] should keep at least one server in default group	Major	rsgroup
HBASE-20517	Fix PerformanceEvaluation 'column' parameter	Major	test
HBASE-20524	Need to clear metrics when ReplicationSourceManager refresh replication sources	Minor	.
HBASE-20476	Open sequence number could go backwards in AssignProcedure	Major	Region Assignment
HBASE-20506	Add doc and test for unused RetryCounter, useful-looking utility	Minor	.
HBASE-20492	UnassignProcedure is stuck in retry loop on region stuck in OPENING state	Critical	amv2
HBASE-20497	The getRecoveredQueueStartPos always return 0 in RecoveredReplicationSourceShipper	Major	Replication
HBASE-18842	The hbase shell clone_snaphost command returns bad error message	Minor	shell
HBASE-20466	Consistently use override mechanism for exempt classes in CoprocessClassloader	Major	Coprocessors
HBASE-20006	TestRestoreSnapshotFromClientWithRegionReplicas is flakey	Critical	read replicas
HBASE-18059	The scanner order for memstore scanners are wrong	Critical	regionserver, scan, Scanners
HBASE-20404	Ugly cleanerchore complaint that dir is not empty	Major	master
HBASE-20419	Fix potential NPE in ZKUtil#listChildrenAndWatchForNewChildren callers	Major	.
HBASE-20364	nightly job gives old results or no results for stages that timeout on SCM	Critical	test
HBASE-20335	nightly jobs no longer contain machine information	Critical	test
HBASE-20338	WALProcedureStore#recoverLease() should have fixed sleeps for retrying rollWriter()	Major	.
HBASE-20356	make skipping protoc possible	Critical	dependencies, thirdparty
HBASE-15291	FileSystem not closed in secure bulkLoad	Major	.
HBASE-20068	Hadoopcheck project health check uses default maven repo instead of yetus managed ones	Major	community, test
HBASE-20361	Non-successive TableInputSplits may wrongly be merged by auto balancing feature	Major	mapreduce
HBASE-20260	Purge old content from the book for branch-2/master	Critical	documentation
HBASE-20058	improper quoting in presplitting command docs	Minor	documentation
HBASE-19923	Reset peer state and config when refresh replication source failed	Major	Replication
HBASE-19748	TestRegionReplicaFailover and TestRegionReplicaReplicationEndpoint UT hangs	Major	.

TESTS:

JIRA	Summary	Priority	Component
HBASE-20667	Rename TestGlobalThrottler to TestReplicationGlobalThrottler	Trivial	.
HBASE-20646	TestWALProcedureStoreOnHDFS failing on branch-1	Trivial	.
HBASE-20505	PE should support multi column family read and write cases	Minor	.
HBASE-20513	Collect and emit ScanMetrics in PerformanceEvaluation	Minor	test
HBASE-20414	TestLockProcedure#testMultipleLocks may fail on slow machine	Major	.

SUB-TASKS:

JIRA	Summary	Priority	Component
HBASE-20831	Copy master doc into branch-2.1 and edit to make it suit 2.1.0	Blocker	documentation
HBASE-20839	Fallback to FSHLog if we can not instantiated AsyncFSWAL when user does not specify AsyncFSWAL explicitly	Blocker	wal
HBASE-20244	NoSuchMethodException when retrieving private method decryptEncryptedDataEncryptionKey from DFSClient	Blocker	wal
HBASE-20193	Basic Replication Web UI - Regionserver	Critical	Replication, Usability
HBASE-20489	Update Reference Guide that CLUSTER_KEY value is present on the Master UI info page.	Minor	documentation
HBASE-19722	Meta query statistics metrics source	Major	.
HBASE-20781	Save recalculating families in a WALEdit batch of Cells	Major	Performance
HBASE-20194	Basic Replication WebUI - Master	Critical	Replication, Usability
HBASE-20780	ServerRpcConnection logging cleanup	Major	logging, Performance
HBASE-19764	Fix Checkstyle errors in hbase-endpoint	Minor	.
HBASE-20710	extra cloneFamily() in Mutation.add(Cell)	Minor	regionserver
HBASE-18569	Add prefetch support for async region locator	Major	asyncclient, Client
HBASE-20706	[hack] Don't add known not-OPEN regions in reopen phase of MTP	Critical	amv2
HBASE-20334	add a test that expressly uses both our shaded client and the one from hadoop 3	Major	hadoop3, shading
HBASE-20615	emphasize use of shaded client jars when they're present in an install	Major	build, Client, Usability
HBASE-20333	break up shaded client into one with no Hadoop and one that's standalone	Critical	shading
HBASE-20332	shaded mapreduce module shouldn't include hadoop	Critical	mapreduce, shading
HBASE-20722	Make RegionServerTracker only depend on children changed event	Major	.
HBASE-20700	Move meta region when server crash can cause the procedure to be stuck	Critical	master, proc-v2, Region Assignment
HBASE-20628	SegmentScanner does over-comparing when one flushing	Critical	Performance
HBASE-19761	Fix Checkstyle errors in hbase-zookeeper	Minor	.
HBASE-19724	Fix Checkstyle errors in hbase-hadoop2-compat	Minor	.
HBASE-20518	Need to serialize the enabled field for UpdatePeerConfigProcedure	Major	Replication
HBASE-20481	Replicate entries from same region serially in ReplicationEndpoint for serial replication	Major	.
HBASE-20378	Provide a hbck option to cleanup replication barrier for a table	Major	.
HBASE-20128	Add new UTs which extends the old replication UTs but set replication scope to SERIAL	Major	.
HBASE-20417	Do not read wal entries when peer is disabled	Major	Replication
HBASE-20294	Also cleanup last pushed sequence id in ReplicationBarrierCleaner	Major	Replication
HBASE-20377	Deal with table in enabling and disabling state when modifying serial replication peer	Major	Replication
HBASE-20367	Write a replication barrier for regions when disabling a table	Major	Replication
HBASE-20296	Remove last pushed sequence ids when removing tables from a peer	Major	Replication
HBASE-20285	Delete all last pushed sequence ids when removing a peer or removing the serial flag for a peer	Major	Replication
HBASE-20138	Find a way to deal with the conflicts when updating replication position	Major	Replication
HBASE-20127	Add UT for serial replication after failover	Major	Replication, test
HBASE-20271	ReplicationSourceWALReader.switched should use the file name instead of the path object directly	Major	Replication
HBASE-20227	Add UT for ReplicationUtils.contains method	Major	Replication, test
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	Optimize the region last pushed sequence id layout on zk	Major	Replication
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	update branch-2 version to 2.1.0-SNAPSHOT	Major	build, community
HBASE-20206	WALEntryStream should not switch WAL file silently	Major	Replication
HBASE-20117	Cleanup the unused replication barriers in meta table	Major	master, Replication
HBASE-20165	Shell command to make a normal peer to be a serial replication peer	Major	.
HBASE-20167	Optimize the implementation of ReplicationSourceWALReader	Major	Replication
HBASE-20125	Add UT for serial replication after region split and merge	Major	Replication
HBASE-20129	Add UT for serial replication checker	Major	Replication
HBASE-20115	Reimplement serial replication based on the new replication storage layer	Major	Replication
HBASE-20050	Reimplement updateReplicationPositions logic in serial replication based on the newly introduced replication storage layer	Major	.
HBASE-20082	Fix findbugs errors only on master which are introduced by HBASE-19397	Major	findbugs
HBASE-19936	Introduce a new base class for replication peer procedure	Major	.
HBASE-19719	Fix checkstyle issues	Major	proc-v2, Replication
HBASE-19711	TestReplicationAdmin.testConcurrentPeerOperations hangs	Major	proc-v2
HBASE-19707	Race in start and terminate of a replication source after we async start replicatione endpoint	Major	proc-v2, Replication
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	Add permission check for executeProcedures in AccessController	Major	proc-v2, Replication
HBASE-19697	Remove TestReplicationAdminUsingProcedure	Major	proc-v2, Replication
HBASE-19661	Replace ReplicationStateZKBase with ZKReplicationStorageBase	Major	proc-v2, Replication
HBASE-19687	Move the logic in ReplicationZKNodeCleaner to ReplicationChecker and remove ReplicationZKNodeCleanerChore	Major	proc-v2, Replication
HBASE-19544	Add UTs for testing concurrent modifications on replication peer	Major	proc-v2, Replication, test
HBASE-19686	Use KeyLocker instead of ReentrantLock in PeerProcedureHandlerImpl	Major	proc-v2, Replication
HBASE-19623	Create replication endpoint asynchronously when adding a replication source	Major	proc-v2, Replication
HBASE-19633	Clean up the replication queues in the postPeerModification stage when removing a peer	Major	proc-v2, Replication
HBASE-19622	Reimplement ReplicationPeers with the new replication storage interface	Major	proc-v2, Replication
HBASE-19635	Introduce a thread at RS side to call reportProcedureDone	Major	proc-v2
HBASE-19617	Remove ReplicationQueues, use ReplicationQueueStorage directly	Major	Replication
HBASE-19642	Fix locking for peer modification procedure	Critical	proc-v2, Replication
HBASE-19592	Add UTs to test retry on update zk failure	Major	proc-v2, Replication
HBASE-19630	Add peer cluster key check when add new replication peer	Major	proc-v2, Replication
HBASE-19573	Rewrite ReplicationPeer with the new replication storage interface	Major	proc-v2, Replication
HBASE-19579	Add peer lock test for shell command list_locks	Major	proc-v2, Replication
HBASE-19599	Remove ReplicationQueuesClient, use ReplicationQueueStorage directly	Major	Replication
HBASE-19543	Abstract a replication storage interface to extract the zk specific code	Major	proc-v2, Replication
HBASE-19525	RS side changes for moving peer modification from zk watcher to procedure	Major	proc-v2, Replication
HBASE-19580	Use slf4j instead of commons-logging in new, just-added Peer Procedure classes	Major	proc-v2, Replication
HBASE-19520	Add UTs for the new lock type PEER	Major	proc-v2
HBASE-19564	Procedure id is missing in the response of peer related operations	Major	proc-v2, Replication
HBASE-19536	Client side changes for moving peer modification from zk watcher to procedure	Major	Replication
HBASE-19524	Master side changes for moving peer modification from zk watcher to procedure	Major	proc-v2, Replication
HBASE-19216	Implement a general framework to execute remote procedure on RS	Major	proc-v2, Replication

OTHER:

JIRA	Summary	Priority	Component
HBASE-19997	[rolling upgrade] 1.x => 2.x	Blocker	.
HBASE-20360	Further optimization for serial replication	Major	Replication
HBASE-20862	Address 2.1.0 Compatibility Report Issues	Blocker	compatibility
HBASE-20665	"Already cached block XXX" message should be DEBUG	Minor	BlockCache
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	Extend backporting strategy in documentation	Trivial	documentation
HBASE-20595	Remove the concept of 'special tables' from rsgroups	Major	Region Assignment, rsgroup
HBASE-20415	branches-2 don't need maven-scala-plugin	Major	build
HBASE-20112	Include test results from nightly hadoop3 tests in jenkins test results	Critical	test
HBASE-17918	document serial replication	Critical	documentation, Replication
HBASE-19737	Manage a HBASE-19397-branch-2 branch and merge it to branch-2	Major	proc-v2, Replication