| HDFS-9376 | TestSeveralNameNodes fails occasionally | Major | test | Kihwal Lee | Masatake Iwasaki | 
| MAPREDUCE-6881 | Fix warnings from Spotbugs in hadoop-mapreduce | Major | . | Weiwei Yang | Weiwei Yang | 
| HADOOP-14354 | SysInfoWindows is not thread safe | Major | . | Íñigo Goiri | Íñigo Goiri | 
| HADOOP-14400 | Fix warnings from spotbugs in hadoop-tools | Major | tools | Weiwei Yang | Weiwei Yang | 
| YARN-6515 | Fix warnings from Spotbugs in hadoop-yarn-server-nodemanager | Major | nodemanager | Naganarasimha G R | Naganarasimha G R | 
| HDFS-11696 | Fix warnings from Spotbugs in hadoop-hdfs | Major | . | Yiqun Lin | Yiqun Lin | 
| HADOOP-14910 | Upgrade netty-all jar to latest 4.0.x.Final | Critical | . | Vinayakumar B | Vinayakumar B | 
| YARN-7589 | TestPBImplRecords fails with NullPointerException | Major | . | Jason Darrell Lowe | Daniel Templeton | 
| YARN-7739 | DefaultAMSProcessor should properly check customized resource types against minimum/maximum allocation | Blocker | . | Wangda Tan | Wangda Tan | 
| YARN-8011 | TestOpportunisticContainerAllocatorAMService#testContainerPromoteAndDemoteBeforeContainerStart fails sometimes in trunk | Minor | . | Tao Yang | Tao Yang | 
| HADOOP-15062 | TestCryptoStreamsWithOpensslAesCtrCryptoCodec fails on Debian 9 | Major | . | Miklos Szegedi | Miklos Szegedi | 
| YARN-8004 | Add unit tests for inter queue preemption for dominant resource calculator | Critical | yarn | Sumana Sathish | Zian Chen | 
| YARN-8210 | AMRMClient logging on every heartbeat to track updation of AM RM token causes too many log lines to be generated in AM logs | Major | yarn | Suma Shivaprasad | Suma Shivaprasad | 
| YARN-8202 | DefaultAMSProcessor should properly check units of requested custom resource types against minimum/maximum allocation | Blocker | . | Szilard Nemeth | Szilard Nemeth | 
| YARN-8179 | Preemption does not happen due to natural_termination_factor when DRF is used | Major | . | kyungwan nam | kyungwan nam | 
| YARN-8369 | Javadoc build failed due to “bad use of ‘>’” | Critical | build, docs | Takanobu Asanuma | Takanobu Asanuma | 
| YARN-8382 | cgroup file leak in NM | Major | nodemanager | Hu Ziqian | Hu Ziqian | 
| HDFS-12459 | Fix revert: Add new op GETFILEBLOCKLOCATIONS to WebHDFS REST API | Major | webhdfs | Weiwei Yang | Weiwei Yang | 
| HDFS-14054 | TestLeaseRecovery2: testHardLeaseRecoveryAfterNameNodeRestart2 and testHardLeaseRecoveryWithRenameAfterNameNodeRestart are flaky | Major | . | Zsolt Venczel | Zsolt Venczel | 
| YARN-9205 | When using custom resource type, application will fail to run due to the CapacityScheduler throws InvalidResourceRequestException(GREATER_THEN_MAX_ALLOCATION) | Critical | . | Zhankun Tang | Zhankun Tang | 
| YARN-4901 | QueueMetrics needs to be cleared before MockRM is initialized | Major | scheduler | Daniel Templeton | Peter Bacsko | 
| HDFS-14647 | NPE during secure namenode startup | Major | hdfs | Fengnan Li | Fengnan Li | 
| HADOOP-16255 | ChecksumFS.Make FileSystem.rename(path, path, options) doesn’t rename checksum | Major | fs | Steve Loughran | Jungtaek Lim | 
| HADOOP-16580 | Disable retry of FailoverOnNetworkExceptionRetry in case of AccessControlException | Major | common | Adam Antal | Adam Antal | 
| HADOOP-16662 | Remove unnecessary InnerNode check in NetworkTopology#add() | Minor | . | Lisheng Sun | Lisheng Sun | 
| YARN-9915 | Fix FindBug issue in QueueMetrics | Minor | . | Prabhu Joseph | Prabhu Joseph | 
| HDFS-12749 | DN may not send block report to NN after NN restart | Major | datanode | TanYuxin | Xiaoqiao He | 
| HDFS-13901 | INode access time is ignored because of race between open and rename | Major | . | Jinglun | Jinglun | 
| HDFS-14931 | hdfs crypto commands limit column width | Major | . | Eric Badger | Eric Badger | 
| YARN-9945 | Fix javadoc in FederationProxyProviderUtil in branch-2 | Major | . | Jonathan Hung | Jonathan Hung | 
| HDFS-14806 | Bootstrap standby may fail if used in-progress tailing | Major | namenode | Chen Liang | Chen Liang | 
| HDFS-14941 | Potential editlog race condition can cause corrupted file | Major | namenode | Chen Liang | Chen Liang | 
| HDFS-14958 | TestBalancerWithNodeGroup is not using NetworkTopologyWithNodeGroup | Minor | hdfs | Jim Brennan | Jim Brennan | 
| HDFS-14884 | Add sanity check that zone key equals feinfo key while setting Xattrs | Major | encryption, hdfs | Mukul Kumar Singh | Mukul Kumar Singh | 
| HADOOP-15097 | AbstractContractDeleteTest::testDeleteNonEmptyDirRecursive with misleading path | Minor | fs, test | zhoutai.zt | Xieming Li | 
| HADOOP-16700 | RpcQueueTime may be negative when the response has to be sent later | Minor | . | xuzq | xuzq | 
| YARN-9838 | Fix resource inconsistency for queues when moving app with reserved container to another queue | Critical | capacity scheduler | jiulongzhu | jiulongzhu | 
| HDFS-14973 | Balancer getBlocks RPC dispersal does not function properly | Major | balancer & mover | Erik Krogen | Erik Krogen | 
| MAPREDUCE-7240 | Exception ’ Invalid event: TA_TOO_MANY_FETCH_FAILURE at SUCCESS_FINISHING_CONTAINER’ cause job error | Critical | . | luhuachao | luhuachao | 
| HDFS-14986 | ReplicaCachingGetSpaceUsed throws  ConcurrentModificationException | Major | datanode, performance | Ryan Wu | Aiphago | 
| MAPREDUCE-7249 | Invalid event TA_TOO_MANY_FETCH_FAILURE at SUCCESS_CONTAINER_CLEANUP causes job failure | Critical | applicationmaster, mrv2 | Wilfred Spiegelenburg | Wilfred Spiegelenburg | 
| HDFS-15005 | Backport HDFS-12300 to branch-2 | Major | hdfs | Chao Sun | Chao Sun | 
| HDFS-15017 | Remove redundant import of AtomicBoolean in NameNodeConnector. | Major | balancer & mover, hdfs | Konstantin Shvachko | Chao Sun | 
| HADOOP-16754 | Fix docker failed to build yetus/hadoop | Blocker | build | Kevin Su | Kevin Su | 
| HDFS-15032 | Balancer crashes when it fails to contact an unavailable NN via ObserverReadProxyProvider | Major | balancer & mover | Erik Krogen | Erik Krogen | 
| HDFS-15036 | Active NameNode should not silently fail the image transfer | Major | namenode | Konstantin Shvachko | Chen Liang | 
| HDFS-15048 | Fix findbug in DirectoryScanner | Major | . | Takanobu Asanuma | Masatake Iwasaki | 
| HDFS-14519 | NameQuota is not update after concat operation, so namequota is wrong | Major | . | Ranith Sardar | Ranith Sardar | 
| HDFS-15076 | Fix tests that hold FSDirectory lock, without holding FSNamesystem lock. | Major | test | Konstantin Shvachko | Konstantin Shvachko | 
| HDFS-14934 | [SBN Read] Standby NN throws many InterruptedExceptions when dfs.ha.tail-edits.period is 0 | Major | . | Takanobu Asanuma | Ayush Saxena | 
| HADOOP-16789 | In TestZKFailoverController, restore changes from HADOOP-11149 that were dropped by HDFS-6440 | Minor | common | Jim Brennan | Jim Brennan | 
| HDFS-15077 | Fix intermittent failure of TestDFSClientRetries#testLeaseRenewSocketTimeout | Minor | test | Masatake Iwasaki | Masatake Iwasaki | 
| YARN-7387 | org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.TestIncreaseAllocationExpirer fails intermittently | Major | . | Miklos Szegedi | Jim Brennan | 
| YARN-8672 | TestContainerManager#testLocalingResourceWhileContainerRunning occasionally times out | Major | nodemanager | Jason Darrell Lowe | Chandni Singh | 
| MAPREDUCE-7252 | Handling 0 progress in SimpleExponential task runtime estimator | Minor | . | Ahmed Hussein | Ahmed Hussein | 
| HADOOP-16749 | Configuration parsing of CDATA values are blank | Major | conf | Jonathan Turner Eagles | Daryn Sharp | 
| HDFS-15099 | [SBN Read] checkOperation(WRITE) should throw ObserverRetryOnActiveException on ObserverNode | Major | namenode | Konstantin Shvachko | Chen Liang | 
| HADOOP-16683 | Disable retry of FailoverOnNetworkExceptionRetry in case of wrapped AccessControlException | Major | common | Adam Antal | Adam Antal | 
| HDFS-13339 | Volume reference can’t be released and may lead to deadlock when DataXceiver does a check volume | Critical | datanode | liaoyuxiangqin | Zsolt Venczel | 
| MAPREDUCE-7256 | Fix javadoc error in SimpleExponentialSmoothing | Minor | documentation | Masatake Iwasaki | Masatake Iwasaki | 
| MAPREDUCE-7247 | Modify HistoryServerRest.html content,change The job attempt id‘s datatype from string to int | Major | documentation | zhaoshengjie | zhaoshengjie | 
| HADOOP-16808 | Use forkCount and reuseForks parameters instead of forkMode in the config of maven surefire plugin | Minor | build | Akira Ajisaka | Xieming Li | 
| HADOOP-16793 | Remove WARN log when ipc connection interrupted in Client#handleSaslConnectionFailure() | Minor | . | Lisheng Sun | Lisheng Sun | 
| YARN-9790 | Failed to set default-application-lifetime if maximum-application-lifetime is less than or equal to zero | Major | . | kyungwan nam | kyungwan nam | 
| HDFS-13179 | TestLazyPersistReplicaRecovery#testDnRestartWithSavedReplicas fails intermittently | Critical | fs | Gabor Bota | Ahmed Hussein | 
| MAPREDUCE-7259 | testSpeculateSuccessfulWithUpdateEvents fails Intermittently | Minor | . | Ahmed Hussein | Ahmed Hussein | 
| HDFS-15146 | TestBalancerRPCDelay.testBalancerRPCDelay fails intermittently | Minor | . | Ahmed Hussein | Ahmed Hussein | 
| MAPREDUCE-7079 | JobHistory#ServiceStop implementation is incorrect | Major | . | Jason Darrell Lowe | Ahmed Hussein | 
| HDFS-15118 | [SBN Read] Slow clients when Observer reads are enabled but there are no Observers on the cluster. | Major | hdfs-client | Konstantin Shvachko | Chen Liang | 
| HDFS-15148 | dfs.namenode.send.qop.enabled should not apply to primary NN port | Major | . | Chen Liang | Chen Liang | 
| YARN-8292 | Fix the dominant resource preemption cannot happen when some of the resource vector becomes negative | Critical | yarn | Sumana Sathish | Wangda Tan | 
| HDFS-15115 | Namenode crash caused by NPE in BlockPlacementPolicyDefault when dynamically change logger to debug | Major | . | wangzhixiang | wangzhixiang | 
| HADOOP-16849 | start-build-env.sh behaves incorrectly when username is numeric only | Minor | build | Jihyun Cho | Jihyun Cho | 
| HDFS-15161 | When evictableMmapped or evictable size is zero, do not throw NoSuchElementException in ShortCircuitCache#close() | Major | . | Lisheng Sun | Lisheng Sun | 
| HDFS-15164 | Fix TestDelegationTokensWithHA | Major | . | Ayush Saxena | Ayush Saxena | 
| HADOOP-16868 | ipc.Server readAndProcess threw NullPointerException | Major | rpc-server | Tsz-wo Sze | Tsz-wo Sze | 
| HADOOP-16869 | Upgrade findbugs-maven-plugin to 3.0.5 to fix mvn findbugs:findbugs failure | Major | build | Akira Ajisaka | Akira Ajisaka | 
| HDFS-15052 | WebHDFS getTrashRoot leads to OOM due to FileSystem object creation | Major | webhdfs | Wei-Chiu Chuang | Masatake Iwasaki | 
| HDFS-15185 | StartupProgress reports edits segments until the entire startup completes | Major | namenode | Konstantin Shvachko | Konstantin Shvachko | 
| HDFS-15166 | Remove redundant field fStream in ByteStringLog | Major | . | Konstantin Shvachko | Xieming Li | 
| YARN-10140 | TestTimelineAuthFilterForV2 fails due to login failures in branch-2.10 | Major | timelineservice | Ahmed Hussein | Ahmed Hussein | 
| YARN-10156 | Fix typo ‘complaint’ which means quite different in Federation.md | Minor | documentation, federation | Sungpeo Kook | Sungpeo Kook | 
| HDFS-15147 | LazyPersistTestCase wait logic is error-prone | Minor | . | Ahmed Hussein | Ahmed Hussein | 
| HADOOP-16891 | Upgrade jackson-databind to 2.9.10.3 | Blocker | . | Siyao Meng | Siyao Meng | 
| HDFS-15204 | TestRetryCacheWithHA testRemoveCacheDescriptor fails intermittently | Major | hdfs | Ahmed Hussein | Ahmed Hussein | 
| HADOOP-16840 | AliyunOSS: getFileStatus throws FileNotFoundException in versioning bucket | Major | fs/oss | wujinhu | wujinhu | 
| YARN-9427 | TestContainerSchedulerQueuing.testKillOnlyRequiredOpportunisticContainers fails sporadically | Major | scheduler, test | Prabhu Joseph | Ahmed Hussein | 
| HDFS-11396 | TestNameNodeMetadataConsistency#testGenerationStampInFuture timed out | Minor | namenode, test | John Zhuge | Ayush Saxena | 
| HADOOP-16949 | pylint fails in the build environment | Critical | build | Akira Ajisaka | Akira Ajisaka | 
| YARN-10227 | Pull YARN-8242 back to branch-2.10 | Major | yarn | Jim Brennan | Jim Brennan | 
| YARN-2710 | RM HA tests failed intermittently on trunk | Major | client | Wangda Tan | Ahmed Hussein | 
| MAPREDUCE-7272 | TaskAttemptListenerImpl excessive log messages | Major | . | Ahmed Hussein | Ahmed Hussein | 
| HDFS-15283 | Cache pool MAXTTL is not persisted and restored on cluster restart | Major | namenode | Stephen O’Donnell | Stephen O’Donnell | 
| HADOOP-16944 | Use Yetus 0.12.0 in GitHub PR | Major | build | Akira Ajisaka | Akira Ajisaka | 
| HDFS-15276 | Concat on INodeRefernce fails with illegal state exception | Critical | . | Hemanth Boyina | Hemanth Boyina | 
| HADOOP-16361 | TestSecureLogins#testValidKerberosName fails on branch-2 | Major | security | Jim Brennan | Jim Brennan | 
| HDFS-15281 | ZKFC ignores dfs.namenode.rpc-bind-host and uses dfs.namenode.rpc-address to bind to host address | Major | ha, namenode | Dhiraj Hegde | Dhiraj Hegde | 
| HDFS-15297 | TestNNHandlesBlockReportPerStorage::blockReport_02 fails intermittently in trunk | Major | datanode, test | Mingliang Liu | Ayush Saxena | 
| YARN-8193 | YARN RM hangs abruptly (stops allocating resources) when running successive applications. | Blocker | yarn | Zian Chen | Zian Chen | 
| YARN-10255 | fix intermittent failure TestContainerSchedulerQueuing.testContainerUpdateExecTypeGuaranteedToOpportunistic in branch-2.10 | Major | . | Ahmed Hussein | Ahmed Hussein | 
| HDFS-15302 | Backport HDFS-15286 to branch-2.x | Blocker | . | Akira Ajisaka | Hemanth Boyina | 
| YARN-8959 | TestContainerResizing fails randomly | Minor | . | Bibin Chundatt | Ahmed Hussein | 
| HDFS-15323 | StandbyNode fails transition to active due to insufficient transaction tailing | Major | namenode, qjm | Konstantin Shvachko | Konstantin Shvachko | 
| HADOOP-15565 | ViewFileSystem.close doesn’t close child filesystems and causes FileSystem objects leak. | Major | . | Jinglun | Jinglun | 
| YARN-9444 | YARN API ResourceUtils’s getRequestedResourcesFromConfig doesn’t recognize yarn.io/gpu as a valid resource | Minor | api | Gergely Pollak | Gergely Pollak | 
| HDFS-15038 | TestFsck testFsckListCorruptSnapshotFiles is failing in trunk | Major | . | Hemanth Boyina | Hemanth Boyina | 
| HADOOP-17045 | Configurationjavadoc describes supporting environment variables, but the feature is not available | Minor | . | Nick Dimiduk | Masatake Iwasaki | 
| HDFS-15293 | Relax the condition for accepting a fsimage when receiving a checkpoint | Critical | namenode | Chen Liang | Chen Liang | 
| HADOOP-17052 | NetUtils.connect() throws unchecked exception (UnresolvedAddressException) causing clients to abort | Major | net | Dhiraj Hegde | Dhiraj Hegde | 
| HADOOP-17062 | Fix shelldocs path in Jenkinsfile | Major | build | Akira Ajisaka | Akira Ajisaka | 
| HDFS-15386 | ReplicaNotFoundException keeps happening in DN after removing multiple DN’s data directories | Major | . | Toshihiro Suzuki | Toshihiro Suzuki | 
| YARN-10300 | appMasterHost not set in RM ApplicationSummary when AM fails before first heartbeat | Major | . | Eric Badger | Eric Badger | 
| HADOOP-17059 | ArrayIndexOfboundsException in ViewFileSystem#listStatus | Major | viewfs | Hemanth Boyina | Hemanth Boyina | 
| YARN-10312 | Add support for yarn logs -logFile to retain backward compatibility | Major | client | Jim Brennan | Jim Brennan | 
| HDFS-12453 | TestDataNodeHotSwapVolumes fails in trunk Jenkins runs | Critical | test | Arpit Agarwal | Lei (Eddy) Xu | 
| HADOOP-17089 | WASB: Update azure-storage-java SDK | Critical | fs/azure | Thomas Marqardt | Thomas Marqardt | 
| HDFS-15421 | IBR leak causes standby NN to be stuck in safe mode | Blocker | namenode | Kihwal Lee | Akira Ajisaka | 
| YARN-9903 | Support reservations continue looking for Node Labels | Major | . | Tarun Parimi | Jim Brennan | 
| HADOOP-17094 | vulnerabilities reported in jackson and jackson-databind in branch-2.10 | Major | . | Ahmed Hussein | Ahmed Hussein | 
| HADOOP-17120 | Fix failure of docker image creation due to pip2 install error | Major | . | Masatake Iwasaki | Masatake Iwasaki | 
| YARN-10348 | Allow RM to always cancel tokens after app completes | Major | yarn | Jim Brennan | Jim Brennan | 
| HDFS-14498 | LeaseManager can loop forever on the file for which create has failed | Major | namenode | Sergey Shelukhin | Stephen O’Donnell | 
| YARN-4771 | Some containers can be skipped during log aggregation after NM restart | Major | nodemanager | Jason Darrell Lowe | Jim Brennan | 
| HDFS-15313 | Ensure inodes in active filesystem are not deleted during snapshot delete | Major | snapshots | Shashikant Banerjee | Shashikant Banerjee | 
| YARN-10363 | TestRMAdminCLI.testHelp is failing in branch-2.10 | Major | yarn | Jim Brennan | Bilwa S T | 
| HADOOP-17184 | Add –mvn-custom-repos parameter to yetus calls | Major | build | Mingliang Liu | Mingliang Liu | 
| HADOOP-17185 | Set MAVEN_OPTS in Jenkinsfile | Major | build | Akira Ajisaka | Akira Ajisaka | 
| HDFS-15499 | Clean up httpfs/pom.xml to remove aws-java-sdk-s3 exclusion | Major | httpfs | Mingliang Liu | Mingliang Liu | 
| HADOOP-17164 | UGI loginUserFromKeytab doesn’t set the last login time | Major | security | Sandeep Guggilam | Sandeep Guggilam | 
| YARN-4575 | ApplicationResourceUsageReport should return ALL  reserved resource | Major | . | Bibin Chundatt | Bibin Chundatt | 
| YARN-7677 | Docker image cannot set HADOOP_CONF_DIR | Major | . | Eric Badger | Jim Brennan | 
| YARN-8459 | Improve Capacity Scheduler logs to debug invalid states | Major | capacity scheduler | Wangda Tan | Wangda Tan | 
| MAPREDUCE-7286 | Fix findbugs warnings in hadoop-mapreduce-project on branch-2.10 | Minor | . | Masatake Iwasaki | Masatake Iwasaki | 
| HADOOP-17204 | Fix typo in Hadoop KMS document | Trivial | documentation, kms | Akira Ajisaka | Xieming Li | 
| HADOOP-17202 | Fix findbugs warnings in hadoop-tools on branch-2.10 | Minor | . | Masatake Iwasaki | Masatake Iwasaki | 
| HDFS-15290 | NPE in HttpServer during NameNode startup | Major | namenode | Konstantin Shvachko | Simbarashe Dzinamarira | 
| YARN-10358 | Fix findbugs warnings in hadoop-yarn-project on branch-2.10 | Minor | . | Masatake Iwasaki | Masatake Iwasaki | 
| YARN-10177 | Backport YARN-7307 to branch-2.10 Allow client/AM update supported resource types via YARN APIs | Blocker | . | Wei-Chiu Chuang | Wei-Chiu Chuang |