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Add 2.9.1 release notes and changes documents

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# "Apache Hadoop" Changelog
## Release 2.9.1 - 2018-04-16
### INCOMPATIBLE CHANGES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
| [HDFS-12883](https://issues.apache.org/jira/browse/HDFS-12883) | RBF: Document Router and State Store metrics | Major | documentation | Yiqun Lin | Yiqun Lin |
| [HDFS-12895](https://issues.apache.org/jira/browse/HDFS-12895) | RBF: Add ACL support for mount table | Major | . | Yiqun Lin | Yiqun Lin |
| [YARN-7190](https://issues.apache.org/jira/browse/YARN-7190) | Ensure only NM classpath in 2.x gets TSv2 related hbase jars, not the user classpath | Major | timelineclient, timelinereader, timelineserver | Vrushali C | Varun Saxena |
| [HDFS-13099](https://issues.apache.org/jira/browse/HDFS-13099) | RBF: Use the ZooKeeper as the default State Store | Minor | documentation | Yiqun Lin | Yiqun Lin |
### IMPORTANT ISSUES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
| [HDFS-13083](https://issues.apache.org/jira/browse/HDFS-13083) | RBF: Fix doc error setting up client | Major | federation | tartarus | tartarus |
### NEW FEATURES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
| [HADOOP-12756](https://issues.apache.org/jira/browse/HADOOP-12756) | Incorporate Aliyun OSS file system implementation | Major | fs, fs/oss | shimingfei | mingfei.shi |
### IMPROVEMENTS:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
| [HADOOP-14872](https://issues.apache.org/jira/browse/HADOOP-14872) | CryptoInputStream should implement unbuffer | Major | fs, security | John Zhuge | John Zhuge |
| [HADOOP-14964](https://issues.apache.org/jira/browse/HADOOP-14964) | AliyunOSS: backport Aliyun OSS module to branch-2 | Major | fs/oss | Genmao Yu | SammiChen |
| [YARN-6851](https://issues.apache.org/jira/browse/YARN-6851) | Capacity Scheduler: document configs for controlling # containers allowed to be allocated per node heartbeat | Minor | . | Wei Yan | Wei Yan |
| [YARN-7495](https://issues.apache.org/jira/browse/YARN-7495) | Improve robustness of the AggregatedLogDeletionService | Major | log-aggregation | Jonathan Eagles | Jonathan Eagles |
| [YARN-7611](https://issues.apache.org/jira/browse/YARN-7611) | Node manager web UI should display container type in containers page | Major | nodemanager, webapp | Weiwei Yang | Weiwei Yang |
| [HADOOP-15056](https://issues.apache.org/jira/browse/HADOOP-15056) | Fix TestUnbuffer#testUnbufferException failure | Minor | test | Jack Bearden | Jack Bearden |
| [HADOOP-15012](https://issues.apache.org/jira/browse/HADOOP-15012) | Add readahead, dropbehind, and unbuffer to StreamCapabilities | Major | fs | John Zhuge | John Zhuge |
| [HADOOP-15104](https://issues.apache.org/jira/browse/HADOOP-15104) | AliyunOSS: change the default value of max error retry | Major | fs/oss | wujinhu | wujinhu |
| [YARN-7642](https://issues.apache.org/jira/browse/YARN-7642) | Add test case to verify context update after container promotion or demotion with or without auto update | Minor | nodemanager | Weiwei Yang | Weiwei Yang |
| [HADOOP-15111](https://issues.apache.org/jira/browse/HADOOP-15111) | AliyunOSS: backport HADOOP-14993 to branch-2 | Major | fs/oss | Genmao Yu | Genmao Yu |
| [HDFS-9023](https://issues.apache.org/jira/browse/HDFS-9023) | When NN is not able to identify DN for replication, reason behind it can be logged | Critical | hdfs-client, namenode | Surendra Singh Lilhore | Xiao Chen |
| [YARN-7678](https://issues.apache.org/jira/browse/YARN-7678) | Ability to enable logging of container memory stats | Major | nodemanager | Jim Brennan | Jim Brennan |
| [HDFS-12945](https://issues.apache.org/jira/browse/HDFS-12945) | Switch to ClientProtocol instead of NamenodeProtocols in NamenodeWebHdfsMethods | Minor | . | Wei Yan | Wei Yan |
| [YARN-7590](https://issues.apache.org/jira/browse/YARN-7590) | Improve container-executor validation check | Major | security, yarn | Eric Yang | Eric Yang |
| [HADOOP-15189](https://issues.apache.org/jira/browse/HADOOP-15189) | backport HADOOP-15039 to branch-2 and branch-3 | Blocker | . | Genmao Yu | Genmao Yu |
| [HADOOP-15212](https://issues.apache.org/jira/browse/HADOOP-15212) | Add independent secret manager method for logging expired tokens | Major | security | Daryn Sharp | Daryn Sharp |
| [YARN-7728](https://issues.apache.org/jira/browse/YARN-7728) | Expose container preemptions related information in Capacity Scheduler queue metrics | Major | . | Eric Payne | Eric Payne |
| [MAPREDUCE-7048](https://issues.apache.org/jira/browse/MAPREDUCE-7048) | Uber AM can crash due to unknown task in statusUpdate | Major | mr-am | Peter Bacsko | Peter Bacsko |
| [HADOOP-13972](https://issues.apache.org/jira/browse/HADOOP-13972) | ADLS to support per-store configuration | Major | fs/adl | John Zhuge | Sharad Sonker |
| [YARN-7813](https://issues.apache.org/jira/browse/YARN-7813) | Capacity Scheduler Intra-queue Preemption should be configurable for each queue | Major | capacity scheduler, scheduler preemption | Eric Payne | Eric Payne |
| [HDFS-11187](https://issues.apache.org/jira/browse/HDFS-11187) | Optimize disk access for last partial chunk checksum of Finalized replica | Major | datanode | Wei-Chiu Chuang | Gabor Bota |
| [HADOOP-15279](https://issues.apache.org/jira/browse/HADOOP-15279) | increase maven heap size recommendations | Minor | build, documentation, test | Allen Wittenauer | Allen Wittenauer |
| [HDFS-12884](https://issues.apache.org/jira/browse/HDFS-12884) | BlockUnderConstructionFeature.truncateBlock should be of type BlockInfo | Major | namenode | Konstantin Shvachko | chencan |
| [HADOOP-15334](https://issues.apache.org/jira/browse/HADOOP-15334) | Upgrade Maven surefire plugin | Major | build | Arpit Agarwal | Arpit Agarwal |
| [YARN-7623](https://issues.apache.org/jira/browse/YARN-7623) | Fix the CapacityScheduler Queue configuration documentation | Major | . | Arun Suresh | Jonathan Hung |
| [HDFS-13314](https://issues.apache.org/jira/browse/HDFS-13314) | NameNode should optionally exit if it detects FsImage corruption | Major | namenode | Arpit Agarwal | Arpit Agarwal |
### BUG FIXES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
| [HADOOP-13723](https://issues.apache.org/jira/browse/HADOOP-13723) | AliyunOSSInputStream#read() should update read bytes stat correctly | Major | tools | Mingliang Liu | Mingliang Liu |
| [HADOOP-14045](https://issues.apache.org/jira/browse/HADOOP-14045) | Aliyun OSS documentation missing from website | Major | documentation, fs/oss | Andrew Wang | Yiqun Lin |
| [HADOOP-14458](https://issues.apache.org/jira/browse/HADOOP-14458) | Add missing imports to TestAliyunOSSFileSystemContract.java | Trivial | fs/oss, test | Mingliang Liu | Mingliang Liu |
| [HADOOP-14466](https://issues.apache.org/jira/browse/HADOOP-14466) | Remove useless document from TestAliyunOSSFileSystemContract.java | Minor | documentation | Akira Ajisaka | Chen Liang |
| [HDFS-12318](https://issues.apache.org/jira/browse/HDFS-12318) | Fix IOException condition for openInfo in DFSInputStream | Major | . | legend | legend |
| [HDFS-12614](https://issues.apache.org/jira/browse/HDFS-12614) | FSPermissionChecker#getINodeAttrs() throws NPE when INodeAttributesProvider configured | Major | . | Manoj Govindassamy | Manoj Govindassamy |
| [HDFS-12788](https://issues.apache.org/jira/browse/HDFS-12788) | Reset the upload button when file upload fails | Critical | ui, webhdfs | Brahma Reddy Battula | Brahma Reddy Battula |
| [YARN-7388](https://issues.apache.org/jira/browse/YARN-7388) | TestAMRestart should be scheduler agnostic | Major | . | Haibo Chen | Haibo Chen |
| [HDFS-12705](https://issues.apache.org/jira/browse/HDFS-12705) | WebHdfsFileSystem exceptions should retain the caused by exception | Major | hdfs | Daryn Sharp | Hanisha Koneru |
| [YARN-7361](https://issues.apache.org/jira/browse/YARN-7361) | Improve the docker container runtime documentation | Major | . | Shane Kumpf | Shane Kumpf |
| [YARN-7469](https://issues.apache.org/jira/browse/YARN-7469) | Capacity Scheduler Intra-queue preemption: User can starve if newest app is exactly at user limit | Major | capacity scheduler, yarn | Eric Payne | Eric Payne |
| [YARN-7489](https://issues.apache.org/jira/browse/YARN-7489) | ConcurrentModificationException in RMAppImpl#getRMAppMetrics | Major | capacityscheduler | Tao Yang | Tao Yang |
| [YARN-7525](https://issues.apache.org/jira/browse/YARN-7525) | Incorrect query parameters in cluster nodes REST API document | Minor | documentation | Tao Yang | Tao Yang |
| [HADOOP-15045](https://issues.apache.org/jira/browse/HADOOP-15045) | ISA-L build options are documented in branch-2 | Major | build, documentation | Akira Ajisaka | Akira Ajisaka |
| [YARN-7390](https://issues.apache.org/jira/browse/YARN-7390) | All reservation related test cases failed when TestYarnClient runs against Fair Scheduler. | Major | fairscheduler, reservation system | Yufei Gu | Yufei Gu |
| [HDFS-12754](https://issues.apache.org/jira/browse/HDFS-12754) | Lease renewal can hit a deadlock | Major | . | Kuhu Shukla | Kuhu Shukla |
| [HDFS-12832](https://issues.apache.org/jira/browse/HDFS-12832) | INode.getFullPathName may throw ArrayIndexOutOfBoundsException lead to NameNode exit | Critical | namenode | DENG FEI | Konstantin Shvachko |
| [HDFS-11754](https://issues.apache.org/jira/browse/HDFS-11754) | Make FsServerDefaults cache configurable. | Minor | . | Rushabh S Shah | Mikhail Erofeev |
| [YARN-7509](https://issues.apache.org/jira/browse/YARN-7509) | AsyncScheduleThread and ResourceCommitterService are still running after RM is transitioned to standby | Critical | . | Tao Yang | Tao Yang |
| [YARN-7558](https://issues.apache.org/jira/browse/YARN-7558) | "yarn logs" command fails to get logs for running containers if UI authentication is enabled. | Critical | . | Namit Maheshwari | Xuan Gong |
| [HDFS-12638](https://issues.apache.org/jira/browse/HDFS-12638) | Delete copy-on-truncate block along with the original block, when deleting a file being truncated | Blocker | hdfs | Jiandan Yang | Konstantin Shvachko |
| [MAPREDUCE-5124](https://issues.apache.org/jira/browse/MAPREDUCE-5124) | AM lacks flow control for task events | Major | mr-am | Jason Lowe | Peter Bacsko |
| [YARN-7455](https://issues.apache.org/jira/browse/YARN-7455) | quote\_and\_append\_arg can overflow buffer | Major | nodemanager | Jason Lowe | Jim Brennan |
| [HADOOP-14985](https://issues.apache.org/jira/browse/HADOOP-14985) | Remove subversion related code from VersionInfoMojo.java | Minor | build | Akira Ajisaka | Ajay Kumar |
| [HDFS-12889](https://issues.apache.org/jira/browse/HDFS-12889) | Router UI is missing robots.txt file | Major | . | Bharat Viswanadham | Bharat Viswanadham |
| [HDFS-11576](https://issues.apache.org/jira/browse/HDFS-11576) | Block recovery will fail indefinitely if recovery time \> heartbeat interval | Critical | datanode, hdfs, namenode | Lukas Majercak | Lukas Majercak |
| [YARN-7607](https://issues.apache.org/jira/browse/YARN-7607) | Remove the trailing duplicated timestamp in container diagnostics message | Minor | nodemanager | Weiwei Yang | Weiwei Yang |
| [HADOOP-15080](https://issues.apache.org/jira/browse/HADOOP-15080) | Aliyun OSS: update oss sdk from 2.8.1 to 2.8.3 to remove its dependency on Cat-x "json-lib" | Blocker | fs/oss | Chris Douglas | SammiChen |
| [YARN-7591](https://issues.apache.org/jira/browse/YARN-7591) | NPE in async-scheduling mode of CapacityScheduler | Critical | capacityscheduler | Tao Yang | Tao Yang |
| [YARN-7608](https://issues.apache.org/jira/browse/YARN-7608) | Incorrect sTarget column causing DataTable warning on RM application and scheduler web page | Major | resourcemanager, webapp | Weiwei Yang | Gergely Novák |
| [HDFS-12833](https://issues.apache.org/jira/browse/HDFS-12833) | Distcp : Update the usage of delete option for dependency with update and overwrite option | Minor | distcp, hdfs | Harshakiran Reddy | usharani |
| [YARN-7647](https://issues.apache.org/jira/browse/YARN-7647) | NM print inappropriate error log when node-labels is enabled | Minor | . | Yang Wang | Yang Wang |
| [HDFS-12907](https://issues.apache.org/jira/browse/HDFS-12907) | Allow read-only access to reserved raw for non-superusers | Major | namenode | Daryn Sharp | Rushabh S Shah |
| [HDFS-12881](https://issues.apache.org/jira/browse/HDFS-12881) | Output streams closed with IOUtils suppressing write errors | Major | . | Jason Lowe | Ajay Kumar |
| [YARN-7595](https://issues.apache.org/jira/browse/YARN-7595) | Container launching code suppresses close exceptions after writes | Major | nodemanager | Jason Lowe | Jim Brennan |
| [HADOOP-15085](https://issues.apache.org/jira/browse/HADOOP-15085) | Output streams closed with IOUtils suppressing write errors | Major | . | Jason Lowe | Jim Brennan |
| [YARN-7661](https://issues.apache.org/jira/browse/YARN-7661) | NodeManager metrics return wrong value after update node resource | Major | . | Yang Wang | Yang Wang |
| [HDFS-12347](https://issues.apache.org/jira/browse/HDFS-12347) | TestBalancerRPCDelay#testBalancerRPCDelay fails very frequently | Critical | test | Xiao Chen | Bharat Viswanadham |
| [YARN-7542](https://issues.apache.org/jira/browse/YARN-7542) | Fix issue that causes some Running Opportunistic Containers to be recovered as PAUSED | Major | . | Arun Suresh | Sampada Dehankar |
| [HADOOP-15143](https://issues.apache.org/jira/browse/HADOOP-15143) | NPE due to Invalid KerberosTicket in UGI | Major | . | Jitendra Nath Pandey | Mukul Kumar Singh |
| [YARN-7692](https://issues.apache.org/jira/browse/YARN-7692) | Skip validating priority acls while recovering applications | Blocker | resourcemanager | Charan Hebri | Sunil G |
| [MAPREDUCE-7028](https://issues.apache.org/jira/browse/MAPREDUCE-7028) | Concurrent task progress updates causing NPE in Application Master | Blocker | mr-am | Gergo Repas | Gergo Repas |
| [YARN-7619](https://issues.apache.org/jira/browse/YARN-7619) | Max AM Resource value in Capacity Scheduler UI has to be refreshed for every user | Major | capacity scheduler, yarn | Eric Payne | Eric Payne |
| [YARN-7699](https://issues.apache.org/jira/browse/YARN-7699) | queueUsagePercentage is coming as INF for getApp REST api call | Major | webapp | Sunil G | Sunil G |
| [YARN-7508](https://issues.apache.org/jira/browse/YARN-7508) | NPE in FiCaSchedulerApp when debug log enabled in async-scheduling mode | Major | capacityscheduler | Tao Yang | Tao Yang |
| [YARN-7663](https://issues.apache.org/jira/browse/YARN-7663) | RMAppImpl:Invalid event: START at KILLED | Minor | resourcemanager | lujie | lujie |
| [YARN-6948](https://issues.apache.org/jira/browse/YARN-6948) | Invalid event: ATTEMPT\_ADDED at FINAL\_SAVING | Minor | yarn | lujie | lujie |
| [YARN-7735](https://issues.apache.org/jira/browse/YARN-7735) | Fix typo in YARN documentation | Minor | documentation | Takanobu Asanuma | Takanobu Asanuma |
| [YARN-7727](https://issues.apache.org/jira/browse/YARN-7727) | Incorrect log levels in few logs with QueuePriorityContainerCandidateSelector | Minor | yarn | Prabhu Joseph | Prabhu Joseph |
| [HDFS-11915](https://issues.apache.org/jira/browse/HDFS-11915) | Sync rbw dir on the first hsync() to avoid file lost on power failure | Critical | . | Kanaka Kumar Avvaru | Vinayakumar B |
| [HDFS-9049](https://issues.apache.org/jira/browse/HDFS-9049) | Make Datanode Netty reverse proxy port to be configurable | Major | datanode | Vinayakumar B | Vinayakumar B |
| [HADOOP-15150](https://issues.apache.org/jira/browse/HADOOP-15150) | in FsShell, UGI params should be overidden through env vars(-D arg) | Major | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [HADOOP-15181](https://issues.apache.org/jira/browse/HADOOP-15181) | Typo in SecureMode.md | Trivial | documentation | Masahiro Tanaka | Masahiro Tanaka |
| [YARN-7737](https://issues.apache.org/jira/browse/YARN-7737) | prelaunch.err file not found exception on container failure | Major | . | Jonathan Hung | Keqiu Hu |
| [HDFS-13063](https://issues.apache.org/jira/browse/HDFS-13063) | Fix the incorrect spelling in HDFSHighAvailabilityWithQJM.md | Trivial | documentation | Jianfei Jiang | Jianfei Jiang |
| [YARN-7102](https://issues.apache.org/jira/browse/YARN-7102) | NM heartbeat stuck when responseId overflows MAX\_INT | Critical | . | Botong Huang | Botong Huang |
| [HADOOP-15151](https://issues.apache.org/jira/browse/HADOOP-15151) | MapFile.fix creates a wrong index file in case of block-compressed data file. | Major | common | Grigori Rybkine | Grigori Rybkine |
| [MAPREDUCE-7020](https://issues.apache.org/jira/browse/MAPREDUCE-7020) | Task timeout in uber mode can crash AM | Major | mr-am | Akira Ajisaka | Peter Bacsko |
| [YARN-7698](https://issues.apache.org/jira/browse/YARN-7698) | A misleading variable's name in ApplicationAttemptEventDispatcher | Minor | resourcemanager | Jinjiang Ling | Jinjiang Ling |
| [HDFS-13100](https://issues.apache.org/jira/browse/HDFS-13100) | Handle IllegalArgumentException when GETSERVERDEFAULTS is not implemented in webhdfs. | Critical | hdfs, webhdfs | Yongjun Zhang | Yongjun Zhang |
| [YARN-6868](https://issues.apache.org/jira/browse/YARN-6868) | Add test scope to certain entries in hadoop-yarn-server-resourcemanager pom.xml | Major | yarn | Ray Chiang | Ray Chiang |
| [YARN-7849](https://issues.apache.org/jira/browse/YARN-7849) | TestMiniYarnClusterNodeUtilization#testUpdateNodeUtilization fails due to heartbeat sync error | Major | test | Jason Lowe | Botong Huang |
| [YARN-7801](https://issues.apache.org/jira/browse/YARN-7801) | AmFilterInitializer should addFilter after fill all parameters | Critical | . | Sumana Sathish | Wangda Tan |
| [YARN-7890](https://issues.apache.org/jira/browse/YARN-7890) | NPE during container relaunch | Major | . | Billie Rinaldi | Jason Lowe |
| [HDFS-12935](https://issues.apache.org/jira/browse/HDFS-12935) | Get ambiguous result for DFSAdmin command in HA mode when only one namenode is up | Major | tools | Jianfei Jiang | Jianfei Jiang |
| [HDFS-13120](https://issues.apache.org/jira/browse/HDFS-13120) | Snapshot diff could be corrupted after concat | Major | namenode, snapshots | Xiaoyu Yao | Xiaoyu Yao |
| [HDFS-10453](https://issues.apache.org/jira/browse/HDFS-10453) | ReplicationMonitor thread could stuck for long time due to the race between replication and delete of same file in a large cluster. | Major | namenode | He Xiaoqiao | He Xiaoqiao |
| [HDFS-8693](https://issues.apache.org/jira/browse/HDFS-8693) | refreshNamenodes does not support adding a new standby to a running DN | Critical | datanode, ha | Jian Fang | Ajith S |
| [MAPREDUCE-7052](https://issues.apache.org/jira/browse/MAPREDUCE-7052) | TestFixedLengthInputFormat#testFormatCompressedIn is flaky | Major | client, test | Peter Bacsko | Peter Bacsko |
| [HDFS-13112](https://issues.apache.org/jira/browse/HDFS-13112) | Token expiration edits may cause log corruption or deadlock | Critical | namenode | Daryn Sharp | Daryn Sharp |
| [MAPREDUCE-7053](https://issues.apache.org/jira/browse/MAPREDUCE-7053) | Timed out tasks can fail to produce thread dump | Major | . | Jason Lowe | Jason Lowe |
| [HADOOP-15206](https://issues.apache.org/jira/browse/HADOOP-15206) | BZip2 drops and duplicates records when input split size is small | Major | . | Aki Tanaka | Aki Tanaka |
| [YARN-7947](https://issues.apache.org/jira/browse/YARN-7947) | Capacity Scheduler intra-queue preemption can NPE for non-schedulable apps | Major | capacity scheduler, scheduler preemption | Eric Payne | Eric Payne |
| [YARN-7945](https://issues.apache.org/jira/browse/YARN-7945) | Java Doc error in UnmanagedAMPoolManager for branch-2 | Major | . | Rohith Sharma K S | Botong Huang |
| [HADOOP-14903](https://issues.apache.org/jira/browse/HADOOP-14903) | Add json-smart explicitly to pom.xml | Major | common | Ray Chiang | Ray Chiang |
| [HDFS-12781](https://issues.apache.org/jira/browse/HDFS-12781) | After Datanode down, In Namenode UI Datanode tab is throwing warning message. | Major | datanode | Harshakiran Reddy | Brahma Reddy Battula |
| [HDFS-12070](https://issues.apache.org/jira/browse/HDFS-12070) | Failed block recovery leaves files open indefinitely and at risk for data loss | Major | . | Daryn Sharp | Kihwal Lee |
| [HADOOP-15251](https://issues.apache.org/jira/browse/HADOOP-15251) | Backport HADOOP-13514 (surefire upgrade) to branch-2 | Major | test | Chris Douglas | Chris Douglas |
| [HADOOP-15275](https://issues.apache.org/jira/browse/HADOOP-15275) | Incorrect javadoc for return type of RetryPolicy#shouldRetry | Minor | documentation | Nanda kumar | Nanda kumar |
| [YARN-7511](https://issues.apache.org/jira/browse/YARN-7511) | NPE in ContainerLocalizer when localization failed for running container | Major | nodemanager | Tao Yang | Tao Yang |
| [MAPREDUCE-7023](https://issues.apache.org/jira/browse/MAPREDUCE-7023) | TestHadoopArchiveLogs.testCheckFilesAndSeedApps fails on rerun | Minor | test | Gergely Novák | Gergely Novák |
| [HADOOP-15283](https://issues.apache.org/jira/browse/HADOOP-15283) | Upgrade from findbugs 3.0.1 to spotbugs 3.1.2 in branch-2 to fix docker image build | Major | . | Xiao Chen | Akira Ajisaka |
| [YARN-7736](https://issues.apache.org/jira/browse/YARN-7736) | Fix itemization in YARN federation document | Minor | documentation | Akira Ajisaka | Sen Zhao |
| [HDFS-13164](https://issues.apache.org/jira/browse/HDFS-13164) | File not closed if streamer fail with DSQuotaExceededException | Major | hdfs-client | Xiao Chen | Xiao Chen |
| [HDFS-13109](https://issues.apache.org/jira/browse/HDFS-13109) | Support fully qualified hdfs path in EZ commands | Major | hdfs | Hanisha Koneru | Hanisha Koneru |
| [MAPREDUCE-6930](https://issues.apache.org/jira/browse/MAPREDUCE-6930) | mapreduce.map.cpu.vcores and mapreduce.reduce.cpu.vcores are both present twice in mapred-default.xml | Major | mrv2 | Daniel Templeton | Sen Zhao |
| [HDFS-12156](https://issues.apache.org/jira/browse/HDFS-12156) | TestFSImage fails without -Pnative | Major | test | Akira Ajisaka | Akira Ajisaka |
| [HADOOP-15308](https://issues.apache.org/jira/browse/HADOOP-15308) | TestConfiguration fails on Windows because of paths | Major | . | Íñigo Goiri | Xiao Liang |
| [YARN-7636](https://issues.apache.org/jira/browse/YARN-7636) | Re-reservation count may overflow when cluster resource exhausted for a long time | Major | capacityscheduler | Tao Yang | Tao Yang |
| [HDFS-12886](https://issues.apache.org/jira/browse/HDFS-12886) | Ignore minReplication for block recovery | Major | hdfs, namenode | Lukas Majercak | Lukas Majercak |
| [HDFS-13296](https://issues.apache.org/jira/browse/HDFS-13296) | GenericTestUtils generates paths with drive letter in Windows and fail webhdfs related test cases | Major | . | Xiao Liang | Xiao Liang |
| [HDFS-13268](https://issues.apache.org/jira/browse/HDFS-13268) | TestWebHdfsFileContextMainOperations fails on Windows | Major | . | Íñigo Goiri | Xiao Liang |
| [YARN-8054](https://issues.apache.org/jira/browse/YARN-8054) | Improve robustness of the LocalDirsHandlerService MonitoringTimerTask thread | Major | . | Jonathan Eagles | Jonathan Eagles |
| [YARN-7873](https://issues.apache.org/jira/browse/YARN-7873) | Revert YARN-6078 | Blocker | . | Billie Rinaldi | Billie Rinaldi |
| [HDFS-13195](https://issues.apache.org/jira/browse/HDFS-13195) | DataNode conf page cannot display the current value after reconfig | Minor | datanode | maobaolong | maobaolong |
| [HADOOP-15320](https://issues.apache.org/jira/browse/HADOOP-15320) | Remove customized getFileBlockLocations for hadoop-azure and hadoop-azure-datalake | Major | fs/adl, fs/azure | shanyu zhao | shanyu zhao |
| [HADOOP-12862](https://issues.apache.org/jira/browse/HADOOP-12862) | LDAP Group Mapping over SSL can not specify trust store | Major | . | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HDFS-13427](https://issues.apache.org/jira/browse/HDFS-13427) | Fix the section titles of transparent encryption document | Minor | documentation | Akira Ajisaka | Akira Ajisaka |
### TESTS:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
| [HADOOP-14696](https://issues.apache.org/jira/browse/HADOOP-14696) | parallel tests don't work for Windows | Minor | test | Allen Wittenauer | Allen Wittenauer |
### SUB-TASKS:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
| [HADOOP-13481](https://issues.apache.org/jira/browse/HADOOP-13481) | User end documents for Aliyun OSS FileSystem | Minor | fs, fs/oss | Genmao Yu | Genmao Yu |
| [HADOOP-13591](https://issues.apache.org/jira/browse/HADOOP-13591) | Unit test failure in TestOSSContractGetFileStatus and TestOSSContractRootDir | Major | fs, fs/oss | Genmao Yu | Genmao Yu |
| [HADOOP-13624](https://issues.apache.org/jira/browse/HADOOP-13624) | Rename TestAliyunOSSContractDispCp | Major | fs, fs/oss | Kai Zheng | Genmao Yu |
| [HADOOP-14065](https://issues.apache.org/jira/browse/HADOOP-14065) | AliyunOSS: oss directory filestatus should use meta time | Major | fs/oss | Fei Hui | Fei Hui |
| [HADOOP-13768](https://issues.apache.org/jira/browse/HADOOP-13768) | AliyunOSS: handle the failure in the batch delete operation `deleteDirs`. | Major | fs | Genmao Yu | Genmao Yu |
| [HADOOP-14069](https://issues.apache.org/jira/browse/HADOOP-14069) | AliyunOSS: listStatus returns wrong file info | Major | fs/oss | Fei Hui | Fei Hui |
| [HADOOP-13769](https://issues.apache.org/jira/browse/HADOOP-13769) | AliyunOSS: update oss sdk version | Major | fs, fs/oss | Genmao Yu | Genmao Yu |
| [HADOOP-14072](https://issues.apache.org/jira/browse/HADOOP-14072) | AliyunOSS: Failed to read from stream when seek beyond the download size | Major | fs/oss | Genmao Yu | Genmao Yu |
| [HADOOP-14192](https://issues.apache.org/jira/browse/HADOOP-14192) | Aliyun OSS FileSystem contract test should implement getTestBaseDir() | Major | fs/oss | Mingliang Liu | Mingliang Liu |
| [HADOOP-14194](https://issues.apache.org/jira/browse/HADOOP-14194) | Aliyun OSS should not use empty endpoint as default | Major | fs/oss | Mingliang Liu | Genmao Yu |
| [HADOOP-14787](https://issues.apache.org/jira/browse/HADOOP-14787) | AliyunOSS: Implement the `createNonRecursive` operator | Major | fs, fs/oss | Genmao Yu | Genmao Yu |
| [HADOOP-14649](https://issues.apache.org/jira/browse/HADOOP-14649) | Update aliyun-sdk-oss version to 2.8.1 | Major | fs/oss | Ray Chiang | Genmao Yu |
| [HADOOP-14799](https://issues.apache.org/jira/browse/HADOOP-14799) | Update nimbus-jose-jwt to 4.41.1 | Major | . | Ray Chiang | Ray Chiang |
| [HADOOP-14997](https://issues.apache.org/jira/browse/HADOOP-14997) | Add hadoop-aliyun as dependency of hadoop-cloud-storage | Minor | fs/oss | Genmao Yu | Genmao Yu |
| [HDFS-12801](https://issues.apache.org/jira/browse/HDFS-12801) | RBF: Set MountTableResolver as default file resolver | Minor | . | Íñigo Goiri | Íñigo Goiri |
| [YARN-7430](https://issues.apache.org/jira/browse/YARN-7430) | Enable user re-mapping for Docker containers by default | Blocker | security, yarn | Eric Yang | Eric Yang |
| [YARN-6128](https://issues.apache.org/jira/browse/YARN-6128) | Add support for AMRMProxy HA | Major | amrmproxy, nodemanager | Subru Krishnan | Botong Huang |
| [HADOOP-15024](https://issues.apache.org/jira/browse/HADOOP-15024) | AliyunOSS: support user agent configuration and include that & Hadoop version information to oss server | Major | fs, fs/oss | SammiChen | SammiChen |
| [HDFS-12858](https://issues.apache.org/jira/browse/HDFS-12858) | RBF: Add router admin commands usage in HDFS commands reference doc | Minor | documentation | Yiqun Lin | Yiqun Lin |
| [HDFS-12835](https://issues.apache.org/jira/browse/HDFS-12835) | RBF: Fix Javadoc parameter errors | Minor | . | Wei Yan | Wei Yan |
| [YARN-7587](https://issues.apache.org/jira/browse/YARN-7587) | Skip dispatching opportunistic containers to nodes whose queue is already full | Major | . | Weiwei Yang | Weiwei Yang |
| [HDFS-12396](https://issues.apache.org/jira/browse/HDFS-12396) | Webhdfs file system should get delegation token from kms provider. | Major | encryption, kms, webhdfs | Rushabh S Shah | Rushabh S Shah |
| [YARN-6704](https://issues.apache.org/jira/browse/YARN-6704) | Add support for work preserving NM restart when FederationInterceptor is enabled in AMRMProxyService | Major | . | Botong Huang | Botong Huang |
| [HDFS-12875](https://issues.apache.org/jira/browse/HDFS-12875) | RBF: Complete logic for -readonly option of dfsrouteradmin add command | Major | . | Yiqun Lin | Íñigo Goiri |
| [YARN-7630](https://issues.apache.org/jira/browse/YARN-7630) | Fix AMRMToken rollover handling in AMRMProxy | Minor | . | Botong Huang | Botong Huang |
| [HDFS-12937](https://issues.apache.org/jira/browse/HDFS-12937) | RBF: Add more unit tests for router admin commands | Major | test | Yiqun Lin | Yiqun Lin |
| [HDFS-12988](https://issues.apache.org/jira/browse/HDFS-12988) | RBF: Mount table entries not properly updated in the local cache | Major | . | Íñigo Goiri | Íñigo Goiri |
| [HADOOP-15156](https://issues.apache.org/jira/browse/HADOOP-15156) | backport HADOOP-15086 rename fix to branch-2 | Major | fs/azure | Thomas Marquardt | Thomas Marquardt |
| [YARN-7716](https://issues.apache.org/jira/browse/YARN-7716) | metricsTimeStart and metricsTimeEnd should be all lower case in the doc | Major | timelinereader | Haibo Chen | Haibo Chen |
| [HDFS-12802](https://issues.apache.org/jira/browse/HDFS-12802) | RBF: Control MountTableResolver cache size | Major | . | Íñigo Goiri | Íñigo Goiri |
| [HADOOP-15027](https://issues.apache.org/jira/browse/HADOOP-15027) | AliyunOSS: Support multi-thread pre-read to improve sequential read from Hadoop to Aliyun OSS performance | Major | fs/oss | wujinhu | wujinhu |
| [HDFS-13028](https://issues.apache.org/jira/browse/HDFS-13028) | RBF: Fix spurious TestRouterRpc#testProxyGetStats | Minor | . | Íñigo Goiri | Íñigo Goiri |
| [YARN-5094](https://issues.apache.org/jira/browse/YARN-5094) | some YARN container events have timestamp of -1 | Critical | . | Sangjin Lee | Haibo Chen |
| [YARN-7782](https://issues.apache.org/jira/browse/YARN-7782) | Enable user re-mapping for Docker containers in yarn-default.xml | Blocker | security, yarn | Eric Yang | Eric Yang |
| [HDFS-12772](https://issues.apache.org/jira/browse/HDFS-12772) | RBF: Federation Router State State Store internal API | Major | . | Íñigo Goiri | Íñigo Goiri |
| [HDFS-13042](https://issues.apache.org/jira/browse/HDFS-13042) | RBF: Heartbeat Router State | Major | . | Íñigo Goiri | Íñigo Goiri |
| [HDFS-13049](https://issues.apache.org/jira/browse/HDFS-13049) | RBF: Inconsistent Router OPTS config in branch-2 and branch-3 | Minor | . | Wei Yan | Wei Yan |
| [HDFS-12574](https://issues.apache.org/jira/browse/HDFS-12574) | Add CryptoInputStream to WebHdfsFileSystem read call. | Major | encryption, kms, webhdfs | Rushabh S Shah | Rushabh S Shah |
| [HDFS-13044](https://issues.apache.org/jira/browse/HDFS-13044) | RBF: Add a safe mode for the Router | Major | . | Íñigo Goiri | Íñigo Goiri |
| [HDFS-13043](https://issues.apache.org/jira/browse/HDFS-13043) | RBF: Expose the state of the Routers in the federation | Major | . | Íñigo Goiri | Íñigo Goiri |
| [HDFS-13068](https://issues.apache.org/jira/browse/HDFS-13068) | RBF: Add router admin option to manage safe mode | Major | . | Íñigo Goiri | Yiqun Lin |
| [HDFS-13119](https://issues.apache.org/jira/browse/HDFS-13119) | RBF: Manage unavailable clusters | Major | . | Íñigo Goiri | Yiqun Lin |
| [HDFS-13187](https://issues.apache.org/jira/browse/HDFS-13187) | RBF: Fix Routers information shown in the web UI | Minor | . | Wei Yan | Wei Yan |
| [HDFS-13184](https://issues.apache.org/jira/browse/HDFS-13184) | RBF: Improve the unit test TestRouterRPCClientRetries | Minor | test | Yiqun Lin | Yiqun Lin |
| [HDFS-13199](https://issues.apache.org/jira/browse/HDFS-13199) | RBF: Fix the hdfs router page missing label icon issue | Major | federation, hdfs | maobaolong | maobaolong |
| [HDFS-13214](https://issues.apache.org/jira/browse/HDFS-13214) | RBF: Complete document of Router configuration | Major | . | Tao Jie | Yiqun Lin |
| [HDFS-13230](https://issues.apache.org/jira/browse/HDFS-13230) | RBF: ConnectionManager's cleanup task will compare each pool's own active conns with its total conns | Minor | . | Wei Yan | Chao Sun |
| [HDFS-13233](https://issues.apache.org/jira/browse/HDFS-13233) | RBF: MountTableResolver doesn't return the correct mount point of the given path | Major | hdfs | wangzhiyuan | wangzhiyuan |
| [HDFS-13212](https://issues.apache.org/jira/browse/HDFS-13212) | RBF: Fix router location cache issue | Major | federation, hdfs | Weiwei Wu | Weiwei Wu |
| [HDFS-13232](https://issues.apache.org/jira/browse/HDFS-13232) | RBF: ConnectionPool should return first usable connection | Minor | . | Wei Yan | Ekanth S |
| [HDFS-13240](https://issues.apache.org/jira/browse/HDFS-13240) | RBF: Update some inaccurate document descriptions | Minor | . | Yiqun Lin | Yiqun Lin |
| [HDFS-11399](https://issues.apache.org/jira/browse/HDFS-11399) | Many tests fails in Windows due to injecting disk failures | Major | . | Yiqun Lin | Yiqun Lin |
| [HDFS-13241](https://issues.apache.org/jira/browse/HDFS-13241) | RBF: TestRouterSafemode failed if the port 8888 is in use | Major | hdfs, test | maobaolong | maobaolong |
| [HDFS-13253](https://issues.apache.org/jira/browse/HDFS-13253) | RBF: Quota management incorrect parent-child relationship judgement | Major | . | Yiqun Lin | Yiqun Lin |
| [HDFS-13226](https://issues.apache.org/jira/browse/HDFS-13226) | RBF: Throw the exception if mount table entry validated failed | Major | hdfs | maobaolong | maobaolong |
| [HDFS-12773](https://issues.apache.org/jira/browse/HDFS-12773) | RBF: Improve State Store FS implementation | Major | . | Íñigo Goiri | Íñigo Goiri |
| [HDFS-13198](https://issues.apache.org/jira/browse/HDFS-13198) | RBF: RouterHeartbeatService throws out CachedStateStore related exceptions when starting router | Minor | . | Wei Yan | Wei Yan |
| [HDFS-13224](https://issues.apache.org/jira/browse/HDFS-13224) | RBF: Resolvers to support mount points across multiple subclusters | Major | . | Íñigo Goiri | Íñigo Goiri |
| [HADOOP-15262](https://issues.apache.org/jira/browse/HADOOP-15262) | AliyunOSS: move files under a directory in parallel when rename a directory | Major | fs/oss | wujinhu | wujinhu |
| [HDFS-13215](https://issues.apache.org/jira/browse/HDFS-13215) | RBF: Move Router to its own module | Major | . | Íñigo Goiri | Wei Yan |
| [HDFS-13250](https://issues.apache.org/jira/browse/HDFS-13250) | RBF: Router to manage requests across multiple subclusters | Major | . | Íñigo Goiri | Íñigo Goiri |
| [HDFS-13318](https://issues.apache.org/jira/browse/HDFS-13318) | RBF: Fix FindBugs in hadoop-hdfs-rbf | Minor | . | Íñigo Goiri | Ekanth S |
| [HDFS-12792](https://issues.apache.org/jira/browse/HDFS-12792) | RBF: Test Router-based federation using HDFSContract | Major | . | Íñigo Goiri | Íñigo Goiri |
| [HDFS-12512](https://issues.apache.org/jira/browse/HDFS-12512) | RBF: Add WebHDFS | Major | fs | Íñigo Goiri | Wei Yan |
| [HDFS-13291](https://issues.apache.org/jira/browse/HDFS-13291) | RBF: Implement available space based OrderResolver | Major | . | Yiqun Lin | Yiqun Lin |
| [HDFS-13204](https://issues.apache.org/jira/browse/HDFS-13204) | RBF: Optimize name service safe mode icon | Minor | . | liuhongtong | liuhongtong |
| [HDFS-13352](https://issues.apache.org/jira/browse/HDFS-13352) | RBF: Add xsl stylesheet for hdfs-rbf-default.xml | Major | documentation | Takanobu Asanuma | Takanobu Asanuma |
| [YARN-8010](https://issues.apache.org/jira/browse/YARN-8010) | Add config in FederationRMFailoverProxy to not bypass facade cache when failing over | Minor | . | Botong Huang | Botong Huang |
| [HDFS-13347](https://issues.apache.org/jira/browse/HDFS-13347) | RBF: Cache datanode reports | Minor | . | Íñigo Goiri | Íñigo Goiri |
| [HDFS-13289](https://issues.apache.org/jira/browse/HDFS-13289) | RBF: TestConnectionManager#testCleanup() test case need correction | Minor | . | Dibyendu Karmakar | Dibyendu Karmakar |
| [HDFS-13364](https://issues.apache.org/jira/browse/HDFS-13364) | RBF: Support NamenodeProtocol in the Router | Major | . | Íñigo Goiri | Íñigo Goiri |
| [HADOOP-14651](https://issues.apache.org/jira/browse/HADOOP-14651) | Update okhttp version to 2.7.5 | Major | fs/adl | Ray Chiang | Ray Chiang |
| [HADOOP-14999](https://issues.apache.org/jira/browse/HADOOP-14999) | AliyunOSS: provide one asynchronous multi-part based uploading mechanism | Major | fs/oss | Genmao Yu | Genmao Yu |
### OTHER:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
| [HADOOP-15149](https://issues.apache.org/jira/browse/HADOOP-15149) | CryptoOutputStream should implement StreamCapabilities | Major | fs | Mike Drob | Xiao Chen |
| [YARN-7691](https://issues.apache.org/jira/browse/YARN-7691) | Add Unit Tests for ContainersLauncher | Major | . | Sampada Dehankar | Sampada Dehankar |
| [HADOOP-15177](https://issues.apache.org/jira/browse/HADOOP-15177) | Update the release year to 2018 | Blocker | build | Akira Ajisaka | Bharat Viswanadham |

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# to you under the Apache License, Version 2.0 (the
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# with the License. You may obtain a copy of the License at
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# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
-->
# "Apache Hadoop" 2.9.1 Release Notes
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.
---
* [HADOOP-12756](https://issues.apache.org/jira/browse/HADOOP-12756) | *Major* | **Incorporate Aliyun OSS file system implementation**
Aliyun OSS is widely used among China’s cloud users and this work implemented a new Hadoop compatible filesystem AliyunOSSFileSystem with oss scheme, similar to the s3a and azure support.
---
* [HADOOP-14964](https://issues.apache.org/jira/browse/HADOOP-14964) | *Major* | **AliyunOSS: backport Aliyun OSS module to branch-2**
Aliyun OSS is widely used among China’s cloud users and this work implemented a new Hadoop compatible filesystem AliyunOSSFileSystem with oss:// scheme, similar to the s3a and azure support.
---
* [HDFS-12883](https://issues.apache.org/jira/browse/HDFS-12883) | *Major* | **RBF: Document Router and State Store metrics**
This JIRA makes following change:
Change Router metrics context from 'router' to 'dfs'.
---
* [HDFS-12895](https://issues.apache.org/jira/browse/HDFS-12895) | *Major* | **RBF: Add ACL support for mount table**
Mount tables support ACL, The users won't be able to modify their own entries (we are assuming these old (no-permissions before) mount table with owner:superuser, group:supergroup, permission:755 as the default permissions). The fix way is login as superuser to modify these mount table entries.
---
* [YARN-7190](https://issues.apache.org/jira/browse/YARN-7190) | *Major* | **Ensure only NM classpath in 2.x gets TSv2 related hbase jars, not the user classpath**
Ensure only NM classpath in 2.x gets TSv2 related hbase jars, not the user classpath.
---
* [HADOOP-15156](https://issues.apache.org/jira/browse/HADOOP-15156) | *Major* | **backport HADOOP-15086 rename fix to branch-2**
[WASB] Fix Azure implementation of Filesystem.rename to ensure that at most one operation succeeds when there are multiple, concurrent rename operations targeting the same destination file.
---
* [HADOOP-15027](https://issues.apache.org/jira/browse/HADOOP-15027) | *Major* | **AliyunOSS: Support multi-thread pre-read to improve sequential read from Hadoop to Aliyun OSS performance**
Support multi-thread pre-read in AliyunOSSInputStream to improve the sequential read performance from Hadoop to Aliyun OSS.
---
* [HDFS-13083](https://issues.apache.org/jira/browse/HDFS-13083) | *Major* | **RBF: Fix doc error setting up client**
Fix the document error of setting up HFDS Router Federation
---
* [HDFS-13099](https://issues.apache.org/jira/browse/HDFS-13099) | *Minor* | **RBF: Use the ZooKeeper as the default State Store**
Change default State Store from local file to ZooKeeper. This will require additional zk address to be configured.

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hadoop-project-dist/pom.xml
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<activeByDefault>false</activeByDefault> <activeByDefault>false</activeByDefault>
</activation> </activation>
<properties> <properties>
<jdiff.stable.api>3.0.2</jdiff.stable.api> <jdiff.stable.api>2.9.1</jdiff.stable.api>
<jdiff.stability>-unstable</jdiff.stability> <jdiff.stability>-unstable</jdiff.stability>
<!-- Commented out for HADOOP-11776 --> <!-- Commented out for HADOOP-11776 -->
<!-- Uncomment param name="${jdiff.compatibility}" in javadoc doclet if compatibility is not empty --> <!-- Uncomment param name="${jdiff.compatibility}" in javadoc doclet if compatibility is not empty -->