1. Improvement HDFS-12770
    Add doc about how to disable client socket cache
  2. Bug HDFS-12732
    Correct spellings of ramdomly to randomly in log.
  3. Bug HDFS-12249
    dfsadmin -metaSave to output maintenance mode blocks
  4. Wish HDFS-12957
    Multi master name node
  5. Sub-task HDFS-12801
    RBF: Set MountTableResolver as default file resolver
  6. Improvement HDFS-12482
    Provide a configuration to adjust the weight of EC recovery tasks to adjust the speed of recovery
  7. Bug HDFS-12695
    Add a link to HDFS router federation document in site.xml
  8. Bug HDFS-13746
    Still occasional "Should be different group" failure in TestRefreshUserMappings#testGroupMappingRefresh
  9. Improvement HDFS-13385
    Unknown compression method
  10. Task HDFS-14573
    Backport Standby Read to branch-3
  11. Bug HDFS-13259
    file-info-preview-{head,tail} events are added duplicately
  12. Improvement HDFS-12555
    HDFS federation should support configure secondary directory
  13. Bug HDFS-12518
    Re-encryption should handle task cancellation and progress better
  14. Bug HDFS-12497
    Re-enable TestDFSStripedOutputStreamWithFailure tests
  15. Bug HDFS-12494
    libhdfs SIGSEGV in setTLSExceptionStrings
  16. Bug HDFS-13412
    filesystem will throw out-of-bounds access for webhdfs using DirectoryListing
  17. Bug HDFS-13723
    Occasional "Should be different group" error in TestRefreshUserMappings#testGroupMappingRefresh
  18. Improvement HDFS-12573
    Divide the total block metrics into replica and ec
  19. Sub-task HDFS-12620
    Backporting HDFS-10467 to branch-2
  20. Improvement HDFS-12613
    Native EC coder should implement release() as idempotent function.
  21. Bug HDFS-12612
    DFSStripedOutputStream#close will throw if called a second time with a failed streamer
  22. Bug HDFS-12614
    FSPermissionChecker#getINodeAttrs() throws NPE when INodeAttributesProvider configured
  23. Bug HDFS-12567
    BlockPlacementPolicyRackFaultTolerant fails with racks with very few nodes
  24. Improvement HDFS-12603
    Enable async edit logging by default
  25. Bug HDFS-12725
    BlockPlacementPolicyRackFaultTolerant fails with very uneven racks
  26. Bug HDFS-12938
    TestErasureCodigCLI testAll failing consistently.
  27. Bug HDFS-13065
    TestErasureCodingMultipleRacks#testSkewedRack3 is failing
  28. Sub-task HDFS-13083
    RBF: Fix doc error setting up client
  29. Bug HDFS-12960
    The audit log recorded the wrong result when the delete API return false
  30. Sub-task HDFS-12802
    RBF: Control MountTableResolver cache size
  31. Bug HDFS-12913
    TestDNFencingWithReplication.testFencingStress fix mini cluster not yet active issue
  32. Bug HDFS-12891
    Do not invalidate blocks if toInvalidate is empty
  33. Bug HDFS-12915
    Fix findbugs warning in INodeFile$HeaderFormat.getBlockLayoutRedundancy
  34. Task HDFS-12847
    Regenerate editsStored and editsStored.xml in HDFS tests
  35. Improvement HDFS-12544
    SnapshotDiff - support diff generation on any snapshot root descendant directory
  36. Bug HDFS-12748
    NameNode memory leak when accessing webhdfs GETHOMEDIRECTORY
  37. Bug HDFS-4493
    webhdfs fails after SPNEGO token expires
  38. Bug HDFS-12453
    TestDataNodeHotSwapVolumes fails in trunk Jenkins runs
  39. Bug HDFS-12606
    When using native decoder, DFSStripedStream#close crashes JVM after being called multiple times.
  40. Bug HDFS-12872
    EC Checksum broken when BlockAccessToken is enabled
  41. Bug HDFS-12832
    INode.getFullPathName may throw ArrayIndexOutOfBoundsException lead to NameNode exit
  42. Bug HDFS-12442
    WebHdfsFileSystem#getFileBlockLocations will always return BlockLocation#corrupt as false
  43. Bug HDFS-12686
    Erasure coding system policy state is not correctly saved and loaded during real cluster restart
  44. Bug HDFS-12682
    ECAdmin -listPolicies will always show SystemErasureCodingPolicies state as DISABLED
  45. Bug HDFS-12569
    Unset EC policy logs empty payload in edit log
  46. Bug HDFS-12638
    Delete copy-on-truncate block along with the original block, when deleting a file being truncated
  47. Bug HDFS-12840
    Creating a file with non-default EC policy in a EC zone is not correctly serialized in the editlog
  48. Sub-task HDFS-11467
    Support ErasureCoding section in OIV XML/ReverseXML
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