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  1. Bug HDFS-13210
    Fix the typo in MiniDFSCluster class
  2. Bug HDFS-13573
    Javadoc for BlockPlacementPolicyDefault is inaccurate
  3. Improvement HDFS-14406
    Add per user RPC Processing time
  4. Improvement HDFS-13727
    Log full stack trace if DiskBalancer exits with an unhandled exception
  5. Sub-task HDFS-13733
    RBF: Add Web UI configurations and descriptions to RBF document
  6. Improvement HDFS-13692
    StorageInfoDefragmenter floods log when compacting StorageInfo TreeSet
  7. Improvement HDFS-13712
    BlockReaderRemote.read() logging improvement
  8. Improvement HDFS-13690
    Improve error message when creating encryption zone while KMS is unreachable
  9. Bug HDFS-11396
    TestNameNodeMetadataConsistency#testGenerationStampInFuture timed out
  10. Sub-task HDFS-13410
    RBF: Support federation with no subclusters
  11. Sub-task HDFS-13402
    RBF: Fix java doc for StateStoreFileSystemImpl
  12. Sub-task HDFS-13240
    RBF: Update some inaccurate document descriptions
  13. Test HDFS-13542
    TestBlockManager#testNeededReplicationWhileAppending fails due to improper cluster shutdown in TestBlockManager#testBlockManagerMachinesArray on Windows
  14. Improvement HDFS-13598
    Reduce unnecessary byte-to-string transform operation in INodesInPath#toString
  15. Bug HDFS-14669
    TestDirectoryScanner#testDirectoryScannerInFederatedCluster fails intermittently in trunk
  16. Improvement HDFS-13884
    Improve the description of the setting dfs.image.compress
  17. Bug HDFS-14303
    check block directory logic not correct when there is only meta file, print no meaning warn log
  18. Sub-task HDFS-13499
    RBF: Show disabled name services in the UI
  19. Sub-task HDFS-13384
    RBF: Improve timeout RPC call mechanism
  20. Bug HDFS-13420
    License header is displayed in ArchivalStorage/MemoryStorage html pages
  21. Sub-task HDFS-13289
    RBF: TestConnectionManager#testCleanup() test case need correction
  22. Improvement HDFS-13829
    Remove redundant condition judgement in DirectoryScanner#scan
  23. Sub-task HDFS-13184
    RBF: Improve the unit test TestRouterRPCClientRetries
  24. Bug HDFS-13130
    Log object instance get incorrectly in SlowDiskTracker
  25. Improvement HDFS-13363
    Record file path when FSDirAclOp throws AclException
  26. Improvement HDFS-16049
    Display HDFS rack info in HDFS Namenode ui
  27. Task HDFS-14573
    Backport Standby Read to branch-3
  28. Bug HDFS-14389
    getAclStatus returns incorrect permissions and owner when an iNodeAttributeProvider is configured
  29. Bug HDFS-12459
    Fix revert: Add new op GETFILEBLOCKLOCATIONS to WebHDFS REST API
  30. Bug HDFS-11900
    Hedged reads thread pool creation not synchronized
  31. Improvement HDFS-13719
    Docs around dfs.image.transfer.timeout are misleading
  32. Sub-task HDFS-13750
    RBF: Router ID in RouterRpcClient is always null
  33. Bug HDFS-13738
    fsck -list-corruptfileblocks has infinite loop if user is not privileged.
  34. Bug HDFS-13721
    NPE in DataNode due to uninitialized DiskBalancer
  35. Improvement HDFS-8196
    Post enabled Erasure Coding Policies on NameNode UI
  36. Bug HDFS-11043
    TestWebHdfsTimeouts fails
  37. Sub-task HDFS-13250
    RBF: Router to manage requests across multiple subclusters
  38. Sub-task HDFS-13226
    RBF: Throw the exception if mount table entry validated failed
  39. Improvement HDFS-13225
    StripeReader#checkMissingBlocks() 's IOException info is incomplete
  40. Bug HDFS-13838
    WebHdfsFileSystem.getFileStatus() won't return correct "snapshot enabled" status
  41. Improvement HDFS-13217
    Audit log all EC policy names during addErasureCodingPolicies
  42. Bug HDFS-14002
    TestLayoutVersion#testNameNodeFeatureMinimumCompatibleLayoutVersions fails
  43. Bug HDFS-13962
    Add null check for add-replica pool to avoid lock acquiring
  44. Sub-task HDFS-13525
    RBF: Add unit test TestStateStoreDisabledNameservice
  45. Bug HDFS-13663
    Should throw exception when incorrect block size is set
  46. Improvement HDFS-13658
    Expose HighestPriorityLowRedundancy blocks statistics
  47. Improvement HDFS-13621
    Upgrade common-lang version to 3.7 in hadoop-hdfs-project
  48. Bug HDFS-13642
    Creating a file with block size smaller than EC policy's cell size should fail
  49. Improvement HDFS-13885
    Add debug logs in dfsclient around decrypting EDEK
  50. Bug HDFS-13886
    HttpFSFileSystem.getFileStatus() doesn't return "snapshot enabled" bit
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