| HADOOP-12577 | Bump up commons-collections version to 3.2.2 to address a security flaw | Blocker | build, security | Wei-Chiu Chuang | Wei-Chiu Chuang |
| HADOOP-12526 | [Branch-2] there are duplicate dependency definitions in pom's | Major | build | Sangjin Lee | Sangjin Lee |
| HADOOP-12465 | Incorrect javadoc in WritableUtils.java | Minor | documentation | Martin Petricek | Jagadesh Kiran N |
| HADOOP-12464 | Interrupted client may try to fail-over and retry | Major | ipc | Kihwal Lee | Kihwal Lee |
| HADOOP-12451 | [Branch-2] Setting HADOOP_HOME explicitly should be allowed | Blocker | scripts | Karthik Kambatla | Karthik Kambatla |
| HADOOP-12415 | hdfs and nfs builds broken on -missing compile-time dependency on netty | Major | nfs | Konstantin Boudnik | Tom Zeng |
| HADOOP-12359 | hadoop fs -getmerge doc is wrong | Major | documentation | Daniel Templeton | Jagadesh Kiran N |
| HADOOP-12304 | Applications using FileContext fail with the default file system configured to be wasb/s3/etc. | Blocker | fs | Chris Nauroth | Chris Nauroth |
| HADOOP-12230 | hadoop-project declares duplicate, conflicting curator dependencies | Minor | build | Steve Loughran | Rakesh R |
| HADOOP-12213 | Interrupted exception can occur when Client#stop is called | Minor | . | Oleg Zhurakousky | Kuhu Shukla |
| HADOOP-12191 | Bzip2Factory is not thread safe | Major | io | Jason Lowe | Brahma Reddy Battula |
| HADOOP-12186 | ActiveStandbyElector shouldn't call monitorLockNodeAsync multiple times | Major | ha | zhihai xu | zhihai xu |
| HADOOP-12006 | Remove unimplemented option for hadoop fs -ls from document in branch-2.7 | Major | . | Akira AJISAKA | Akira AJISAKA |
| HADOOP-11932 | MetricsSinkAdapter hangs when being stopped | Critical | . | Jian He | Brahma Reddy Battula |
| HADOOP-11491 | HarFs incorrectly declared as requiring an authority | Critical | fs | Gera Shegalov | Brahma Reddy Battula |
| HADOOP-10365 | BufferedOutputStream in FileUtil#unpackEntries() should be closed in finally block | Minor | util | Ted Yu | Kiran Kumar M R |
| HADOOP-9242 | Duplicate surefire plugin config in hadoop-common | Major | test | Andrey Klochkov | Andrey Klochkov |
| HADOOP-8151 | Error handling in snappy decompressor throws invalid exceptions | Major | io, native | Todd Lipcon | Matt Foley |
| HDFS-9574 | Reduce client failures during datanode restart | Major | . | Kihwal Lee | Kihwal Lee |
| HDFS-9470 | Encryption zone on root not loaded from fsimage after NN restart | Critical | . | Xiao Chen | Xiao Chen |
| HDFS-9445 | Datanode may deadlock while handling a bad volume | Blocker | . | Kihwal Lee | Walter Su |
| HDFS-9431 | DistributedFileSystem#concat fails if the target path is relative. | Major | hdfs-client | Kazuho Fujii | Kazuho Fujii |
| HDFS-9426 | Rollingupgrade finalization is not backward compatible | Blocker | . | Kihwal Lee | Kihwal Lee |
| HDFS-9413 | getContentSummary() on standby should throw StandbyException | Critical | . | Brahma Reddy Battula | Brahma Reddy Battula |
| HDFS-9317 | Document fsck -blockId and -storagepolicy options in branch-2.7 | Major | documentation | Akira AJISAKA | Akira AJISAKA |
| HDFS-9305 | Delayed heartbeat processing causes storm of subsequent heartbeats | Major | datanode | Chris Nauroth | Arpit Agarwal |
| HDFS-9294 | DFSClient deadlock when close file and failed to renew lease | Blocker | hdfs-client | DENG FEI | Brahma Reddy Battula |
| HDFS-9290 | DFSClient#callAppend() is not backward compatible for slightly older NameNodes | Blocker | . | Tony Wu | Tony Wu |
| HDFS-9289 | Make DataStreamer#block thread safe and verify genStamp in commitBlock | Critical | . | Chang Li | Chang Li |
| HDFS-9273 | ACLs on root directory may be lost after NN restart | Critical | namenode | Xiao Chen | Xiao Chen |
| HDFS-9220 | Reading small file (< 512 bytes) that is open for append fails due to incorrect checksum | Blocker | . | Bogdan Raducanu | Jing Zhao |
| HDFS-9178 | Slow datanode I/O can cause a wrong node to be marked bad | Critical | . | Kihwal Lee | Kihwal Lee |
| HDFS-9106 | Transfer failure during pipeline recovery causes permanent write failures | Critical | . | Kihwal Lee | Kihwal Lee |
| HDFS-9083 | Replication violates block placement policy. | Blocker | namenode | Rushabh S Shah | Rushabh S Shah |
| HDFS-9043 | Doc updation for commands in HDFS Federation | Minor | documentation | J.Andreina | J.Andreina |
| HDFS-9042 | Update document for the Storage policy name | Minor | documentation | J.Andreina | J.Andreina |
| HDFS-9033 | dfsadmin -metasave prints “NaN” for cache used% | Major | . | Archana T | Brahma Reddy Battula |
| HDFS-8995 | Flaw in registration bookeeping can make DN die on reconnect | Critical | . | Kihwal Lee | Kihwal Lee |
| HDFS-8950 | NameNode refresh doesn't remove DataNodes that are no longer in the allowed list | Major | datanode, namenode | Daniel Templeton | Daniel Templeton |
| HDFS-8891 | HDFS concat should keep srcs order | Blocker | . | Yong Zhang | Yong Zhang |
| HDFS-8879 | Quota by storage type usage incorrectly initialized upon namenode restart | Major | namenode | Kihwal Lee | Xiaoyu Yao |
| HDFS-8867 | Enable optimized block reports | Major | . | Rushabh S Shah | Daryn Sharp |
| HDFS-8863 | The remaining space check in BlockPlacementPolicyDefault is flawed | Critical | . | Kihwal Lee | Kihwal Lee |
| HDFS-8852 | HDFS architecture documentation of version 2.x is outdated about append write support | Major | documentation | Hong Dai Thanh | Ajith S |
| HDFS-8850 | VolumeScanner thread exits with exception if there is no block pool to be scanned but there are suspicious blocks | Major | datanode | Colin Patrick McCabe | Colin Patrick McCabe |
| HDFS-8846 | Add a unit test for INotify functionality across a layout version upgrade | Major | namenode | Zhe Zhang | Zhe Zhang |
| HDFS-8806 | Inconsistent metrics: number of missing blocks with replication factor 1 not properly cleared | Major | . | Zhe Zhang | Zhe Zhang |
| HDFS-8767 | RawLocalFileSystem.listStatus() returns null for UNIX pipefile | Critical | . | Haohui Mai | Kanaka Kumar Avvaru |
| HDFS-8676 | Delayed rolling upgrade finalization can cause heartbeat expiration and write failures | Critical | . | Kihwal Lee | Walter Su |
| HDFS-8656 | Preserve compatibility of ClientProtocol#rollingUpgrade after finalization | Critical | rolling upgrades | Andrew Wang | Andrew Wang |
| HDFS-8615 | Correct HTTP method in WebHDFS document | Major | documentation | Akira AJISAKA | Brahma Reddy Battula |
| HDFS-8431 | hdfs crypto class not found in Windows | Critical | scripts | Sumana Sathish | Anu Engineer |
| HDFS-8219 | setStoragePolicy with folder behavior is different after cluster restart | Major | . | Peter Shi | Surendra Singh Lilhore |
| HDFS-8099 | Change “DFSInputStream has been closed already” message to debug log level | Minor | hdfs-client | Charles Lamb | Charles Lamb |
| HDFS-8046 | Allow better control of getContentSummary | Major | . | Kihwal Lee | Kihwal Lee |
| HDFS-7725 | Incorrect “nodes in service” metrics caused all writes to fail | Major | . | Ming Ma | Ming Ma |
| HDFS-7609 | Avoid retry cache collision when Standby NameNode loading edits | Critical | namenode | Carrey Zhan | Ming Ma |
| HDFS-6945 | BlockManager should remove a block from excessReplicateMap and decrement ExcessBlocks metric when the block is removed | Critical | namenode | Akira AJISAKA | Akira AJISAKA |
| MAPREDUCE-6549 | multibyte delimiters with LineRecordReader cause duplicate records | Major | mrv1, mrv2 | Dustin Cote | Wilfred Spiegelenburg |
| MAPREDUCE-6540 | TestMRTimelineEventHandling fails | Major | test | Sangjin Lee | Sangjin Lee |
| MAPREDUCE-6528 | Memory leak for HistoryFileManager.getJobSummary() | Critical | jobhistoryserver | Junping Du | Junping Du |
| MAPREDUCE-6518 | Set SO_KEEPALIVE on shuffle connections | Major | mrv2, nodemanager | Nathan Roberts | Chang Li |
| MAPREDUCE-6497 | Fix wrong value of JOB_FINISHED event in JobHistoryEventHandler | Major | . | Shinichi Yamashita | Shinichi Yamashita |
| MAPREDUCE-6492 | AsyncDispatcher exit with NPE on TaskAttemptImpl#sendJHStartEventForAssignedFailTask | Critical | . | Bibin A Chundatt | Bibin A Chundatt |
| MAPREDUCE-6481 | LineRecordReader may give incomplete record and wrong position/key information for uncompressed input sometimes. | Critical | mrv2 | zhihai xu | zhihai xu |
| MAPREDUCE-6474 | ShuffleHandler can possibly exhaust nodemanager file descriptors | Major | mrv2, nodemanager | Nathan Roberts | Kuhu Shukla |
| MAPREDUCE-6472 | MapReduce AM should have java.io.tmpdir=./tmp to be consistent with tasks | Major | mr-am | Jason Lowe | Naganarasimha G R |
| MAPREDUCE-6454 | MapReduce doesn't set the HADOOP_CLASSPATH for jar lib in distributed cache. | Critical | . | Junping Du | Junping Du |
| MAPREDUCE-6451 | DistCp has incorrect chunkFilePath for multiple jobs when strategy is dynamic | Major | distcp | Kuhu Shukla | Kuhu Shukla |
| MAPREDUCE-6442 | Stack trace is missing when error occurs in client protocol provider's constructor | Major | client | Chang Li | Chang Li |
| MAPREDUCE-6439 | AM may fail instead of retrying if RM shuts down during the allocate call | Critical | . | Anubhav Dhoot | Anubhav Dhoot |
| MAPREDUCE-6426 | TestShuffleHandler#testGetMapOutputInfo is failing | Major | test | Devaraj K | zhihai xu |
| MAPREDUCE-6425 | ShuffleHandler passes wrong “base” parameter to getMapOutputInfo if mapId is not in the cache. | Major | mrv2, nodemanager | zhihai xu | zhihai xu |
| MAPREDUCE-6377 | JHS sorting on state column not working in webUi | Minor | jobhistoryserver | Bibin A Chundatt | zhihai xu |
| MAPREDUCE-6273 | HistoryFileManager should check whether summaryFile exists to avoid FileNotFoundException causing HistoryFileInfo into MOVE_FAILED state | Minor | jobhistoryserver | zhihai xu | zhihai xu |
| MAPREDUCE-5982 | Task attempts that fail from the ASSIGNED state can disappear | Major | mr-am | Jason Lowe | Chang Li |
| MAPREDUCE-5948 | org.apache.hadoop.mapred.LineRecordReader does not handle multibyte record delimiters well | Critical | . | Kris Geusebroek | Akira AJISAKA |
| MAPREDUCE-5883 | “Total megabyte-seconds” in job counters is slightly misleading | Minor | . | Nathan Roberts | Nathan Roberts |
| MAPREDUCE-5649 | Reduce cannot use more than 2G memory for the final merge | Major | mrv2 | stanley shi | Gera Shegalov |
| YARN-4434 | NodeManager Disk Checker parameter documentation is not correct | Minor | documentation, nodemanager | Takashi Ohnishi | Weiwei Yang |
| YARN-4424 | Fix deadlock in RMAppImpl | Blocker | . | Yesha Vora | Jian He |
| YARN-4365 | FileSystemNodeLabelStore should check for root dir existence on startup | Major | resourcemanager | Jason Lowe | Kuhu Shukla |
| YARN-4354 | Public resource localization fails with NPE | Blocker | nodemanager | Jason Lowe | Jason Lowe |
| YARN-4348 | ZKRMStateStore.syncInternal shouldn‘t wait for sync completion for avoiding blocking ZK’s event thread | Blocker | . | Tsuyoshi Ozawa | Tsuyoshi Ozawa |
| YARN-4344 | NMs reconnecting with changed capabilities can lead to wrong cluster resource calculations | Critical | resourcemanager | Varun Vasudev | Varun Vasudev |
| YARN-4326 | Fix TestDistributedShell timeout as AHS in MiniYarnCluster no longer binds to default port 8188 | Major | . | MENG DING | MENG DING |
| YARN-4321 | Incessant retries if NoAuthException is thrown by Zookeeper in non HA mode | Major | resourcemanager | Varun Saxena | Varun Saxena |
| YARN-4320 | TestJobHistoryEventHandler fails as AHS in MiniYarnCluster no longer binds to default port 8188 | Major | . | Varun Saxena | Varun Saxena |
| YARN-4313 | Race condition in MiniMRYarnCluster when getting history server address | Major | . | Jian He | Jian He |
| YARN-4312 | TestSubmitApplicationWithRMHA fails on branch-2.7 and branch-2.6 as some of the test cases time out | Major | . | Varun Saxena | Varun Saxena |
| YARN-4281 | 2.7 RM app page is broken | Blocker | . | Chang Li | Chang Li |
| YARN-4241 | Fix typo of property name in yarn-default.xml | Major | documentation | Anthony Rojas | Anthony Rojas |
| YARN-4209 | RMStateStore FENCED state doesn’t work due to updateFencedState called by stateMachine.doTransition | Critical | resourcemanager | zhihai xu | zhihai xu |
| YARN-4180 | AMLauncher does not retry on failures when talking to NM | Critical | resourcemanager | Anubhav Dhoot | Anubhav Dhoot |
| YARN-4127 | RM fail with noAuth error if switched from failover mode to non-failover mode | Major | resourcemanager | Jian He | Varun Saxena |
| YARN-4105 | Capacity Scheduler headroom for DRF is wrong | Major | capacityscheduler | Chang Li | Chang Li |
| YARN-4103 | RM WebServices missing scheme for appattempts logLinks | Major | . | Jonathan Eagles | Jonathan Eagles |
| YARN-4096 | App local logs are leaked if log aggregation fails to initialize for the app | Major | log-aggregation, nodemanager | Jason Lowe | Jason Lowe |
| YARN-4087 | Followup fixes after YARN-2019 regarding RM behavior when state-store error occurs | Major | . | Jian He | Jian He |
| YARN-4047 | ClientRMService getApplications has high scheduler lock contention | Major | resourcemanager | Jason Lowe | Jason Lowe |
| YARN-4041 | Slow delegation token renewal can severely prolong RM recovery | Major | resourcemanager | Jason Lowe | Sunil G |
| YARN-4009 | CORS support for ResourceManager REST API | Major | . | Prakash Ramachandran | Varun Vasudev |
| YARN-4005 | Completed container whose app is finished is not removed from NMStateStore | Major | . | Jun Gong | Jun Gong |
| YARN-4000 | RM crashes with NPE if leaf queue becomes parent queue during restart | Major | capacityscheduler, resourcemanager | Jason Lowe | Varun Saxena |
| YARN-3999 | RM hangs on draining events | Major | . | Jian He | Jian He |
| YARN-3990 | AsyncDispatcher may overloaded with RMAppNodeUpdateEvent when Node is connected/disconnected | Critical | resourcemanager | Rohith Sharma K S | Bibin A Chundatt |
| YARN-3975 | WebAppProxyServlet should not redirect to RM page if AHS is enabled | Major | . | Mit Desai | Mit Desai |
| YARN-3967 | Fetch the application report from the AHS if the RM does not know about it | Major | . | Mit Desai | Mit Desai |
| YARN-3925 | ContainerLogsUtils#getContainerLogFile fails to read container log files from full disks. | Critical | nodemanager | zhihai xu | zhihai xu |
| YARN-3905 | Application History Server UI NPEs when accessing apps run after RM restart | Major | timelineserver | Eric Payne | Eric Payne |
| YARN-3896 | RMNode transitioned from RUNNING to REBOOTED because its response id had not been reset synchronously | Major | resourcemanager | Jun Gong | Jun Gong |
| YARN-3878 | AsyncDispatcher can hang while stopping if it is configured for draining events on stop | Critical | . | Varun Saxena | Varun Saxena |
| YARN-3857 | Memory leak in ResourceManager with SIMPLE mode | Critical | resourcemanager | mujunchao | mujunchao |
| YARN-3802 | Two RMNodes for the same NodeId are used in RM sometimes after NM is reconnected. | Major | resourcemanager | zhihai xu | zhihai xu |
| YARN-3798 | ZKRMStateStore shouldn't create new session without occurrance of SESSIONEXPIED | Blocker | resourcemanager | Bibin A Chundatt | Varun Saxena |
| YARN-3793 | Several NPEs when deleting local files on NM recovery | Major | nodemanager | Karthik Kambatla | Varun Saxena |
| YARN-3780 | Should use equals when compare Resource in RMNodeImpl#ReconnectNodeTransition | Minor | resourcemanager | zhihai xu | zhihai xu |
| YARN-3697 | FairScheduler: ContinuousSchedulingThread can fail to shutdown | Critical | fairscheduler | zhihai xu | zhihai xu |
| YARN-3690 | [JDK8] ‘mvn site’ fails | Major | api, site | Akira AJISAKA | Brahma Reddy Battula |
| YARN-3624 | ApplicationHistoryServer reverses the order of the filters it gets | Major | timelineserver | Mit Desai | Mit Desai |
| YARN-3619 | ContainerMetrics unregisters during getMetrics and leads to ConcurrentModificationException | Major | nodemanager | Jason Lowe | zhihai xu |
| YARN-3535 | Scheduler must re-request container resources when RMContainer transitions from ALLOCATED to KILLED | Critical | capacityscheduler, fairscheduler, resourcemanager | Peng Zhang | Peng Zhang |
| YARN-3508 | Prevent processing preemption events on the main RM dispatcher | Major | resourcemanager, scheduler | Jason Lowe | Varun Saxena |
| YARN-2890 | MiniYarnCluster should turn on timeline service if configured to do so | Major | . | Mit Desai | Mit Desai |
| YARN-2859 | ApplicationHistoryServer binds to default port 8188 in MiniYARNCluster | Critical | timelineserver | Hitesh Shah | Vinod Kumar Vavilapalli |
| YARN-2019 | Retrospect on decision of making RM crashed if any exception throw in ZKRMStateStore | Critical | . | Junping Du | Jian He |