| HADOOP-11035 | distcp on mr1(branch-1) fails with NPE using a short relative source path. | Major | tools | zhihai xu | zhihai xu |
| HADOOP-10562 | Namenode exits on exception without printing stack trace in AbstractDelegationTokenSecretManager | Critical | . | Suresh Srinivas | Suresh Srinivas |
| HADOOP-10142 | Avoid groups lookup for unprivileged users such as “dr.who” | Major | . | Vinayakumar B | Vinayakumar B |
| HADOOP-10090 | Jobtracker metrics not updated properly after execution of a mapreduce job | Major | metrics | Ivan Mitic | Ivan Mitic |
| HADOOP-10009 | Backport HADOOP-7808 to branch-1 | Major | . | Haohui Mai | Haohui Mai |
| HADOOP-9801 | Configuration#writeXml uses platform defaulting encoding, which may mishandle multi-byte characters. | Major | conf | Chris Nauroth | Chris Nauroth |
| HADOOP-9768 | chown and chgrp reject users and groups with spaces on platforms where spaces are otherwise acceptable | Major | fs | Chris Nauroth | Chris Nauroth |
| HADOOP-9678 | TestRPC#testStopsAllThreads intermittently fails on Windows | Major | . | Ivan Mitic | Ivan Mitic |
| HADOOP-9507 | LocalFileSystem rename() is broken in some cases when destination exists | Minor | fs | Mostafa Elhemali | Chris Nauroth |
| HADOOP-9307 | BufferedFSInputStream.read returns wrong results after certain seeks | Major | fs | Todd Lipcon | Todd Lipcon |
| HADOOP-7140 | IPC Reader threads do not stop when server stops | Critical | . | Todd Lipcon | Todd Lipcon |
| HDFS-7503 | Namenode restart after large deletions can cause slow processReport (due to logging) | Major | namenode | Arpit Agarwal | Arpit Agarwal |
| HDFS-6822 | In branch-1, Namenode and datanode fails to replace “_HOST” to hostname for hadoop.http.authentication.kerberos.principal | Major | security | Jing Zhao | Jing Zhao |
| HDFS-6649 | Documentation for setrep is wrong | Trivial | documentation | Alexander Fahlke | Akira AJISAKA |
| HDFS-6141 | WebHdfsFileSystem#toUrl does not perform character escaping. | Major | webhdfs | Chris Nauroth | Chris Nauroth |
| HDFS-5944 | LeaseManager:findLeaseWithPrefixPath can't handle path like /a/b/ right and cause SecondaryNameNode failed do checkpoint | Major | namenode | zhaoyunjiong | zhaoyunjiong |
| HDFS-5685 | DistCp will fail to copy with -delete switch | Major | hdfs-client | Yongjun Zhang | Yongjun Zhang |
| HDFS-5516 | WebHDFS does not require user name when anonymous http requests are disallowed. | Major | webhdfs | Chris Nauroth | Miodrag Radulovic |
| HDFS-5245 | shouldRetry() in WebHDFSFileSystem generates excessive warnings | Minor | webhdfs | Haohui Mai | Haohui Mai |
| HDFS-5211 | Race condition between DistributedFileSystem#close and FileSystem#close can cause return of a closed DistributedFileSystem instance from the FileSystem cache. | Major | hdfs-client | Chris Nauroth | Chris Nauroth |
| HDFS-5003 | TestNNThroughputBenchmark failed caused by existing directories | Minor | test | Xi Fang | Xi Fang |
| HDFS-4944 | WebHDFS cannot create a file path containing characters that must be URI-encoded, such as space. | Major | webhdfs | Chris Nauroth | Chris Nauroth |
| HDFS-4898 | BlockPlacementPolicyWithNodeGroup.chooseRemoteRack() fails to properly fallback to local rack | Minor | namenode | Eric Sirianni | Tsz Wo Nicholas Sze |
| HDFS-4794 | Browsing filesystem via webui throws kerberos exception when NN service RPC is enabled in a secure cluster | Major | security | Benoy Antony | Benoy Antony |
| HDFS-4622 | Remove redundant synchronized from FSNamesystem#rollEditLog in branch-1 | Trivial | . | Jing Zhao | Jing Zhao |
| HDFS-2264 | NamenodeProtocol has the wrong value for clientPrincipal in KerberosInfo annotation | Major | namenode | Aaron T. Myers | Aaron T. Myers |
| MAPREDUCE-6198 | NPE from JobTracker#resolveAndAddToTopology in MR1 cause initJob and heartbeat failure. | Major | mrv1 | zhihai xu | zhihai xu |
| MAPREDUCE-6196 | Fix BigDecimal ArithmeticException in PiEstimator | Minor | . | Ray Chiang | Ray Chiang |
| MAPREDUCE-6170 | TestUlimit failure on JDK8 | Major | contrib/streaming | bc Wong | bc Wong |
| MAPREDUCE-6147 | Support mapreduce.input.fileinputformat.split.maxsize | Minor | mrv1 | zhihai xu | zhihai xu |
| MAPREDUCE-6076 | Zero map split input length combine with none zero map split input length may cause MR1 job hung sometimes. | Major | mrv1 | zhihai xu | zhihai xu |
| MAPREDUCE-6012 | DBInputSplit creates invalid ranges on Oracle | Major | . | Julien Serdaru | Wei Yan |
| MAPREDUCE-6009 | Map-only job with new-api runs wrong OutputCommitter when cleanup scheduled in a reduce slot | Blocker | client, job submission | Gera Shegalov | Gera Shegalov |
| MAPREDUCE-5979 | FairScheduler: zero weight can cause sort failures | Major | scheduler | Anubhav Dhoot | Anubhav Dhoot |
| MAPREDUCE-5968 | Work directory is not deleted when downloadCacheObject throws IOException | Major | mrv1 | zhihai xu | zhihai xu |
| MAPREDUCE-5966 | MR1 FairScheduler use of custom weight adjuster is not thread safe for comparisons | Major | scheduler | Anubhav Dhoot | Anubhav Dhoot |
| MAPREDUCE-5877 | Inconsistency between JT/TT for tasks taking a long time to launch | Critical | jobtracker, tasktracker | Karthik Kambatla | Karthik Kambatla |
| MAPREDUCE-5822 | FairScheduler does not preempt due to fairshare-starvation when fairshare is 1 | Major | scheduler | Anubhav Dhoot | Anubhav Dhoot |
| MAPREDUCE-5808 | Port output replication factor configurable for terasort to Hadoop 1.x | Minor | examples | Chuan Liu | Chuan Liu |
| MAPREDUCE-5710 | Backport MAPREDUCE-1305 to branch-1 | Major | . | Yongjun Zhang | Yongjun Zhang |
| MAPREDUCE-5702 | TaskLogServlet#printTaskLog has spurious HTML closing tags | Trivial | task | Karthik Kambatla | Robert Kanter |
| MAPREDUCE-5698 | Backport MAPREDUCE-1285 to branch-1 | Major | . | Yongjun Zhang | Yongjun Zhang |
| MAPREDUCE-5660 | Log info about possible thrashing (when using memory-based scheduling in Capacity Scheduler) is not printed | Trivial | capacity-sched, mrv1, tasktracker | Adam Kawa | Adam Kawa |
| MAPREDUCE-5569 | FloatSplitter is not generating correct splits | Major | . | Nathan Roberts | Nathan Roberts |
| MAPREDUCE-5556 | mapred docs have incorrect classpath | Trivial | . | Allen Wittenauer | Harsh J |
| MAPREDUCE-5512 | TaskTracker hung after failed reconnect to the JobTracker | Major | tasktracker | Ivan Mitic | Ivan Mitic |
| MAPREDUCE-5508 | JobTracker memory leak caused by unreleased FileSystem objects in JobInProgress#cleanupJob | Critical | jobtracker | Xi Fang | Xi Fang |
| MAPREDUCE-5405 | Job recovery can fail if task log directory symlink from prior run still exists | Major | mrv1 | Chris Nauroth | Chris Nauroth |
| MAPREDUCE-5288 | ResourceEstimator#getEstimatedTotalMapOutputSize suffers from divide by zero issues | Major | mrv1 | Harsh J | Karthik Kambatla |
| MAPREDUCE-5272 | A Minor Error in Javadoc of TestMRWithDistributedCache in Branch-1 | Trivial | test | Zhijie Shen | Zhijie Shen |
| MAPREDUCE-5250 | Searching for ‘;’ in JobTracker History throws ArrayOutOfBoundException | Minor | . | Karthik Kambatla | Karthik Kambatla |
| MAPREDUCE-5218 | Annotate (comment) internal classes as Private | Minor | . | Karthik Kambatla | Karthik Kambatla |
| MAPREDUCE-5217 | DistCp fails when launched by Oozie in a secure cluster | Major | distcp, security | Venkat Ranganathan | Venkat Ranganathan |
| MAPREDUCE-5183 | In, TaskTracker#reportProgress logging of 0.0-1.0 progress is followed by percent sign | Minor | mrv1, tasktracker | Sandy Ryza | Niranjan Singh |
| MAPREDUCE-5133 | TestSubmitJob.testSecureJobExecution is flaky due to job dir deletion race | Major | test | Sandy Ryza | Sandy Ryza |
| MAPREDUCE-5095 | TestShuffleExceptionCount#testCheckException fails occasionally with JDK7 | Major | . | Arpit Agarwal | Arpit Agarwal |
| MAPREDUCE-5073 | TestJobStatusPersistency.testPersistency fails on JDK7 | Major | test | Sandy Ryza | Sandy Ryza |
| MAPREDUCE-5072 | TestDelegationTokenRenewal.testDTRenewal fails in MR1 on jdk7 | Major | test | Sandy Ryza | Sandy Ryza |
| MAPREDUCE-5070 | TestClusterStatus.testClusterMetrics fails on JDK7 | Major | test | Sandy Ryza | Sandy Ryza |
| MAPREDUCE-5047 | keep.failed.task.files=true causes job failure on secure clusters | Major | task, tasktracker | Sandy Ryza | Sandy Ryza |
| MAPREDUCE-5046 | backport MAPREDUCE-1423 to mapred.lib.CombineFileInputFormat | Major | client | Sangjin Lee | |
| MAPREDUCE-4366 | mapred metrics shows negative count of waiting maps and reduces | Major | jobtracker | Thomas Graves | Sandy Ryza |
| MAPREDUCE-2817 | MiniRMCluster hardcodes ‘mapred.local.dir’ configuration to ‘build/test/mapred/local’ | Minor | test | Alejandro Abdelnur | Robert Kanter |