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  1. Bug HDFS-16409
    Fix typo: testHasExeceptionsReturnsCorrectValue -> testHasExceptionsReturnsCorrectValue
  2. Improvement HDFS-16391
    Avoid evaluation of LOG.debug statement in NameNodeHeartbeatService
  3. Improvement HDFS-16153
    Avoid evaluation of LOG.debug statement in QuorumJournalManager
  4. Bug HDFS-16410
    Insecure Xml parsing in OfflineEditsXmlLoader
  5. Bug HDFS-16567
    A NullPointerException occurs when calling setPermission and permission is null
  6. Bug HDFS-16177
    Bug fix for Util#receiveFile
  7. Improvement HDFS-16154
    TestMiniJournalCluster failing intermittently because of not reseting UserGroupInformation completely
  8. New Feature HDFS-16048
    RBF: Print network topology on the router web
  9. Bug HDFS-16108
    Incorrect log placeholders used in JournalNodeSyncer
  10. Wish HDFS-16089
    EC: Add metric EcReconstructionValidateTimeMillis for StripedBlockReconstructor
  11. Improvement HDFS-16085
    Move the getPermissionChecker out of the read lock
  12. Improvement HDFS-16122
    Fix DistCpContext#toString()
  13. Improvement HDFS-16073
    Remove redundant RPC requests for getFileLinkInfo in ClientNamenodeProtocolTranslatorPB
  14. Wish HDFS-16079
    Improve the block state change log
  15. Wish HDFS-16078
    Remove unused parameters for DatanodeManager.handleLifeline()
  16. Improvement HDFS-16080
    RBF: Invoking method in all locations should break the loop after successful result
  17. Bug HDFS-16057
    Make sure the order for location in ENTERING_MAINTENANCE state
  18. Improvement HDFS-16299
    Fix bug for TestDataNodeVolumeMetrics#verifyDataNodeVolumeMetrics
  19. Wish HDFS-16298
    Improve error msg for BlockMissingException
  20. Improvement HDFS-16246
    Print lockWarningThreshold in InstrumentedLock#logWarning and InstrumentedLock#logWaitWarning
  21. Wish HDFS-16319
    Add metrics doc for ReadLockLongHoldCount and WriteLockLongHoldCount
  22. Wish HDFS-16326
    Simplify the code for DiskBalancer
  23. Improvement HDFS-16279
    Print detail datanode info when process first storage report
  24. Wish HDFS-16335
    Fix HDFSCommands.md
  25. Bug HDFS-16329
    Fix log format for BlockManager
  26. New Feature HDFS-16337
    Show start time of Datanode on Web
  27. Wish HDFS-16339
    Show the threshold when mover threads quota is exceeded
  28. Wish HDFS-16312
    Fix typo for DataNodeVolumeMetrics and ProfilingFileIoEvents
  29. Improvement HDFS-15936
    Solve BlockSender#sendPacket() does not record SocketTimeout exception
  30. Bug HDFS-15660
    StorageTypeProto is not compatiable between 3.x and 2.6
  31. Improvement HDFS-15684
    EC: Call recoverLease on DFSStripedOutputStream close exception
  32. Improvement HDFS-15345
    RBF: RouterPermissionChecker#checkSuperuserPrivilege should use UGI#getGroups after HADOOP-13442
  33. Improvement HDFS-15344
    DataNode#checkSuperuserPrivilege should use UGI#getGroups after HADOOP-13442
  34. Bug HDFS-16144
    Revert HDFS-15372 (Files in snapshots no longer see attribute provider permissions)
  35. Sub-task HDFS-16140
    TestBootstrapAliasmap fails by BindException
  36. Task HDFS-16139
    Update BPServiceActor Scheduler's nextBlockReportTime atomically
  37. Bug HDFS-15916
    DistCp: Backward compatibility: Distcp fails from Hadoop 3 to Hadoop 2 for snapshotdiff
  38. Improvement HDFS-15359
    EC: Allow closing a file with committed blocks
  39. Bug HDFS-16050
    Some dynamometer tests fail
  40. Bug HDFS-16068
    WebHdfsFileSystem has a possible connection leak in connection with HttpFS
  41. Improvement HDFS-16075
    Use empty array constants present in StorageType and DatanodeInfo to avoid creating redundant objects
  42. Improvement HDFS-16090
    Fine grained locking for datanodeNetworkCounts
  43. Bug HDFS-16092
    Avoid creating LayoutFlags redundant objects
  44. Improvement HDFS-16074
    Remove an expensive debug string concatenation
  45. Bug HDFS-16127
    Improper pipeline close recovery causes a permanent write failure or data loss.
  46. Improvement HDFS-16082
    Avoid non-atomic operations on exceptionsSinceLastBalance and failedTimesSinceLastSuccessfulBalance in Balancer
  47. Improvement HDFS-16241
    Standby close reconstruction thread
  48. Improvement HDFS-16223
    AvailableSpaceRackFaultTolerantBlockPlacementPolicy should use chooseRandomWithStorageTypeTwoTrial() for better performance.
  49. Improvement HDFS-16221
    RBF: Add usage of refreshCallQueue for Router
  50. Improvement HDFS-16287
    Support to make dfs.namenode.avoid.read.slow.datanode reconfigurable
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