HADOOP-7817: RawLocalFileSystem.append() should give FSDataOutputStream with accurate .getPos().

HADOOP-9477: Add posixGroups support for LDAP groups mapping service.

HADOOP-10965: Print fully qualified path in CommandWithDestination error messages.

HADOOP-11361: Fix a race condition in MetricsSourceAdapter.updateJmxCache.

HADOOP-11404: Clarify the "expected client Kerberos principal is null" authorization message.

HADOOP-11491: HarFs incorrectly declared as requiring an authority.

HADOOP-12001: Fixed LdapGroupsMapping to include configurable Posix UID and GID attributes during the search.

HADOOP-12076: Incomplete Cache Mechanism in CredentialProvider AP.

HADOOP-12189: Improve CallQueueManager#swapQueue to make queue elements drop nearly impossible.

HADOOP-12291: Add support for nested groups in LdapGroupsMapping.

HADOOP-12296: When setnetgrent returns 0 in Linux, exception should be thrown.

HADOOP-12345: Pad hostname correctly in CredentialsSys.java.

HADOOP-12469: distcp should not ignore the ignoreFailures option.

HADOOP-12472: Make GenericTestUtils.assertExceptionContains robust.

HADOOP-12568: Update core-default.xml to describe posixGroups support.

HADOOP-12604: Exception may be swallowed in KMSClientProvide.

HADOOP-12622: Improve the loggings in RetryPolicies and RetryInvocationHandler.

HADOOP-12636: Prevent ServiceLoader failure init for unused FileSystems.

HADOOP-12659: Incorrect usage of config parameters in token manager of KMS.

HADOOP-12672: RPC timeout should not override IPC ping interval.

HADOOP-12716: KerberosAuthenticator#doSpnegoSequence use incorrect class to determine isKeyTab in JDK8.

HADOOP-12751: While using kerberos Hadoop incorrectly assumes names with '@' to be non-simple.

HADOOP-12772: NetworkTopologyWithNodeGroup.getNodeGroup() can loop infinitely for invalid 'loc' values.

HADOOP-12782: Faster LDAP group name resolution with ActiveDirectory.

HADOOP-12793: Write a new group mapping service guide.

HADOOP-12810: FileSystem#listLocatedStatus causes unnecessary RPC call.

HADOOP-12828: Print user when services are started.

HADOOP-12831: LocalFS/FSOutputSummer NPEs in constructor if bytes per checksum set to 0.

HADOOP-12847: Hadoop daemonlog should support https and SPNEGO for Kerberized cluster.

HADOOP-12893: Update LICENSE.txt and NOTICE.txt.

HADOOP-12895: SSLFactory#createSSLSocketFactory exception message is wrong.

HADOOP-12901: Add warning log when KMSClientProvider cannot create a connection to the KMS server.

HADOOP-12906: AuthenticatedURL should convert a 404/Not Found into an FileNotFoundException.

HADOOP-12916: Allow RPC scheduler/callqueue backoff using response times.

HADOOP-12962: KMS key names are incorrectly encoded when creating key.

HADOOP-12985: Support MetricsSource interface for DecayRpcScheduler Metrics.

HADOOP-12994: Specify PositionedReadable, add contract tests, fix problems.

HADOOP-13030: Handle special characters in passwords in KMS startup script.

HADOOP-13042: Restore lost leveldbjni LICENSE and NOTICE changes.

HADOOP-13052: ChecksumFileSystem mishandles crc file permissions.

HADOOP-13105: Support timeouts in LDAP queries in LdapGroupsMapping.

HADOOP-13155: Implement TokenRenewer to renew and cancel delegation tokens in KMS.

HADOOP-13159: Fix potential NPE in Metrics2 source for DecayRpcScheduler.

HADOOP-13179: GenericOptionsParser is not thread-safe because commons-cli OptionBuilder is not thread-safe.

HADOOP-13197: Add non-decayed call metrics for DecayRpcScheduler.

HADOOP-13251: Authenticate with Kerberos credentials when renewing KMS delegation token.

HADOOP-13255: KMSClientProvider should check and renew tgt when doing delegation token operations.

HADOOP-13263: Reload cached groups in background after expiry.

HADOOP-13270: BZip2CompressionInputStream finds the same compression marker twice in corner case, causing duplicate data blocks.

HADOOP-13285: DecayRpcScheduler MXBean should only report decayed CallVolumeSummary.

HADOOP-13350: Additional fix to LICENSE and NOTICE.

HADOOP-13351: TestDFSClientSocketSize buffer size tests are flaky.

HADOOP-13362: DefaultMetricsSystem leaks the source name when a source unregisters.

HADOOP-13403: AzureNativeFileSystem rename/delete performance improvements.

HADOOP-13459: Hadoop-Azure runs several test cases repeatedly, causing unnecessarily long running time.

HADOOP-13513: Java 1.7 support for org.apache.hadoop.fs.azure test cases.

HDFS-2043: TestHFlush failing intermittently.

HDFS-6407: Add sorting and pagination in the datanode tab of the NN Web UI.

HDFS-7166: SbNN Web UI shows #Under replicated blocks and #pending deletion blocks.

HDFS-7314: When the DFSClient lease cannot be renewed, abort open-for-write files rather than the entire DFSClien.

HDFS-7452: Skip StandbyException log for getCorruptFiles().

HDFS-7597: DelegationTokenIdentifier should cache the TokenIdentifier to UGI mapping.

HDFS-7978: Add LOG.isDebugEnabled() guard for some LOG.debug().

HDFS-8546: Use try with resources in DataStorage and Storage.

HDFS-8578: On upgrade, Datanode should process all storage/data dirs in parallel.

HDFS-8581: ContentSummary on / skips further counts on yielding loc.

HDFS-8758: Implement the continuation library in libhdfspp.

HDFS-8816: Improve visualization for the Datanode tab in the NN UI.

HDFS-8831: Trash Support for deletion in HDFS encryption zone.

HDFS-8844: TestHDFSCLI does not cleanup the test directory.

HDFS-8845: DiskChecker should not traverse the entire tree.

HDFS-8964: When validating the edit log, do not read at or beyond the file offset that is being written.

HDFS-9259: Make SO_SNDBUF size configurable at DFSClient side for hdfs write scenario.

HDFS-9317: Document fsck -blockId and -storagepolicy options.

HDFS-9365: Balancer does not work with the HDFS-6376 HA setup.

HDFS-9395: Make HDFS audit logging consistent.

HDFS-9412: getBlocks occupies FSLock and takes too long to complete.

HDFS-9415: Document dfs.cluster.administrators and dfs.permissions.superusergroup.

HDFS-9470: Encryption zone on root not loaded from fsimage after NN restart.

HDFS-9516: Truncate file fails with data dirs on multiple disks.

HDFS-9521: TransferFsImage.receiveFile should account and log separate times for image download and fsync to disk.

HDFS-9530: ReservedSpace is not cleared for abandoned Block.

HDFS-9533: seen_txid in the shared edits directory is modified during bootstrapping.

HDFS-9555: LazyPersistFileScrubber should still sleep if there are errors in the clear progress.

HDFS-9566: Remove expensive 'BlocksMap#getStorages(Block b, final DatanodeStorage.State state)' method.

HDFS-9569: Log the name of the fsimage being loaded for better supportability.

HDFS-9584: NPE in distcp when ssl configuration file does not exist in class path.

HDFS-9608: Disk IO imbalance in HDFS with heterogeneous storages.

HDFS-9624: DataNode start slowly due to the initial DU command operations.

HDFS-9629: Update the footer of Web UI to show year 201.

HDFS-9634: WebHDFS client side exceptions don't provide enough details.

HDFS-9648: TestStartup.testImageChecksum is broken by HDFS-9569s message change.

HDFS-9654: Code refactoring for HDFS-8578.

HDFS-9670: DistCp throws NPE when source is root.

HDFS-9690: ClientProtocol.addBlock is not idempotent after HDFS-8071.

HDFS-9713: DataXceiver#copyBlock should return if block is pinned.

HDFS-9715: Check storage ID uniqueness on datanode startup.

HDFS-9721: Allow Delimited PB OIV tool to run upon fsimage that contains INodeReference.

HDFS-9730: Storage ID update does not happen when there is a layout change.

HDFS-9748: Avoid duplication in pendingReplications when addExpectedReplicasToPending is called twice.

HDFS-9799: Reimplement getCurrentTrashDir to remove incompatibility.

HDFS-9812: Streamer threads leak if failure happens when closing DFSOutputStream.

HDFS-9844: Correct path creation in getTrashRoot to handle root dir.

HDFS-9871: "Bytes Being Moved" -ve(-1 B) when cluster was already balanced.

HDFS-9874: Long living DataXceiver threads cause volume shutdown to block.

HDFS-9881: DistributedFileSystem#getTrashRoot returns incorrect path for encryption zones.

HDFS-9882: Add heartbeatsTotal in Datanode metrics.

HDFS-9902: Support different values of dfs.datanode.du.reserved per storage type.

HDFS-9905: WebHdfsFileSystem#runWithRetry should display original stack trace on error.

HDFS-9941: Do not log StandbyException on NN, other minor logging fixed.

HDFS-10182: Hedged read might overwrite user's buf.

HDFS-10186: DirectoryScanner Improve logs by adding full path of both actual and expected block directories. .

HDFS-10189: PacketResponder#toString should include the downstreams for PacketResponderType.HAS_DOWNSTREAM_IN_PIPELINE.

HDFS-10217: Show 'blockScheduled' tooltip in datanodes table.

HDFS-10228: TestHDFSCLI fails.

HDFS-10235: Last contact for Live Nodes should be relative time.

HDFS-10253: Fix TestRefreshCallQueue failure.

HDFS-10264: Logging improvements in FSImageFormatProtobuf.Saver.

HDFS-10271: Extra bytes are getting released from reservedSpace for append.

HDFS-10277: PositionedReadable test testReadFullyZeroByteFile failing in HDFS.

HDFS-10291: TestShortCircuitLocalRead failing.

HDFS-10319: Balancer should not try to pair storages with different types.

HDFS-10324: Trash directory in an encryption zone should be pre-created with correct permissions.

HDFS-10329: Bad initialisation of StringBuffer in RequestHedgingProxyProvider.

HDFS-10344: DistributedFileSystem#getTrashRoots should skip encryption zone that does not have .Trash.

HDFS-10360: DataNode may format directory and lose blocks if current/VERSION is missing.

HDFS-10417: Improve error message from checkBlockLocalPathAccess.

HDFS-10440: Improve DataNode web UI.

HDFS-10458: getFileEncryptionInfo should return quickly for non-encrypted cluster.

HDFS-10468: HDFS read ends up ignoring an interrupt.

HDFS-10469: Add number of active xceivers to datanode metrics.

HDFS-10481: HTTPFS server should correctly impersonate as end user to open file.

HDFS-10493: Add links to datanode web UI in namenode datanodes page.

HDFS-10508: DFSInputStream should set thread's interrupt status after catching InterruptException from sleep.

HDFS-10556: DistCpOptions should be validated automatically.

HDFS-10617: PendingReconstructionBlocks.size() should be synchronized.

HDFS-10642: TestLazyPersistReplicaRecovery#testDnRestartWithSavedReplicas fails intermittently.

HDFS-10688: BPServiceActor may run into a tight loop for sending block report when hitting IOException.

MAPREDUCE-6543: Migrate MR Client test cases part 2.

MAPREDUCE-6637: Testcase Failure TestFileInputFormat.testSplitLocationInfo.

YARN-2104: Scheduler queue filter failed to work because index of queue column changed.

YARN-4325: Nodemanager log handlers fail to send finished/failed events in some cases.

YARN-4983: JVM and UGI metrics disappear after RM transitioned to standby mod.

YARN-5076: YARN web interfaces lack XFS (Cross-Frame Script) protection.

YARN-5112: Excessive log warnings for directory permission issue on NM recovery.

HADOOP-10406: TestIPC.testIpcWithReaderQueuing may fail.

HADOOP-12551: Introduce FileNotFoundException for WASB FileSystem API.

HADOOP-12608: Fix exception message in WASB when connecting with anonymous credential.

HADOOP-12678: Handle empty rename pending metadata file during atomic rename in redo path.

HDFS-8729: Fix TestFileTruncate#testTruncateWithDataNodesRestartImmediately which occasionally failed.

HDFS-9358: TestNodeCount#testNodeCount timed out.

HDFS-9406: FSImage may get corrupted after deleting snapshot.

HDFS-9672: o.a.h.hdfs.TestLeaseRecovery2 fails intermittently.

MAPREDUCE-6566: Add retry support to mapreduce CLI tool.

MAPREDUCE-6618: YarnClientProtocolProvider leaking the YarnClient thread.

MAPREDUCE-6621: Memory Link in JobClient#submitJobInternal().

YARN-3480: Remove attempts that are beyond max-attempt limit from state store.

YARN-4309: Add container launch related debug information to container logs when a container fails.

YARN-4497: RM might fail to restart when recovering apps whose attempts are missing.

YARN-4565: Sometimes when sizeBasedWeight FairOrderingPolicy is enabled, under stress appears that cluster is virtually in deadlock.

YARN-4584: RM startup failure when AM attempts greater than max-attempts.

YARN-4625: ApplicationSubmissionContext and ApplicationSubmissionContextInfo more consistent.