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  1. Improvement HDFS-16585
    Add @VisibleForTesting in Dispatcher.java after HDFS-16268
  2. Bug HDFS-16934
    org.apache.hadoop.hdfs.tools.TestDFSAdmin#testAllDatanodesReconfig regression
  3. Bug HDFS-16755
    TestQJMWithFaults.testUnresolvableHostName() can fail due to unexpected host resolution
  4. Task HDFS-16618
    sync_file_range error should include more volume and file info
  5. Improvement HDFS-16702
    MiniDFSCluster should report cause of exception in assertion error
  6. Improvement HDFS-16576
    Remove unused imports in HDFS project
  7. Bug HDFS-16350
    Datanode start time should be set after RPC server starts successfully
  8. Sub-task HDFS-16336
    De-flake TestRollingUpgrade#testRollback
  9. Bug HDFS-16939
    Fix the thread safety bug in LowRedundancyBlocks
  10. Bug HDFS-16896
    HDFS Client hedged read has increased failure rate than without hedged read
  11. Bug HDFS-16895
    NamenodeHeartbeatService should use credentials of logged in user
  12. Bug HDFS-16832
    [SBN READ] Fix NPE when check the block location of empty directory
  13. Improvement HDFS-16844
    [RBF] The routers should be resiliant against exceptions from StateStore
  14. Bug HDFS-16836
    StandbyCheckpointer can still trigger rollback fs image after RU is finalized
  15. Bug HDFS-16536
    TestOfflineImageViewer fails on branch-3.3
  16. Task HDFS-16522
    Set Http and Ipc ports for Datanodes in MiniDFSCluster
  17. New Feature HDFS-16521
    DFS API to retrieve slow datanodes
  18. Task HDFS-16528
    Reconfigure slow peer enable for Namenode
  19. Task HDFS-16502
    Reconfigure Block Invalidate limit
  20. Improvement HDFS-16712
    Fix incorrect placeholder in DataNode.java
  21. Test HDFS-16637
    TestHDFSCLI#testAll consistently failing
  22. Bug HDFS-16635
    Fix javadoc error in Java 11
  23. Task HDFS-16634
    Dynamically adjust slow peer report size on JMX metrics
  24. New Feature HDFS-16595
    Slow peer metrics - add median, mad and upper latency limits
  25. Bug HDFS-16583
    DatanodeAdminDefaultMonitor can get stuck in an infinite loop
  26. Bug HDFS-16623
    IllegalArgumentException in LifelineSender
  27. Test HDFS-16625
    Unit tests aren't checking for PMDK availability
  28. New Feature HDFS-16582
    Expose aggregate latency of slow node as perceived by the reporting node
  29. Bug HDFS-16586
    Purge FsDatasetAsyncDiskService threadgroup; it causes BPServiceActor$CommandProcessingThread IllegalThreadStateException 'fatal exception and exit'
  30. Bug HDFS-16729
    RBF: fix some unreasonably annotated docs
  31. Sub-task HDFS-16484
    [SPS]: Fix an infinite loop bug in SPSPathIdProcessor thread
  32. Task HDFS-16481
    Provide support to set Http and Rpc ports in MiniJournalCluster
  33. Improvement HDFS-16495
    RBF should prepend the client ip rather than append it.
  34. Improvement HDFS-16426
    fix nextBlockReportTime when trigger full block report force
  35. New Feature HDFS-16413
    Reconfig dfs usage parameters for datanode
  36. New Feature HDFS-16568
    dfsadmin -reconfig option to start/query reconfig on all live datanodes
  37. Improvement HDFS-16687
    RouterFsckServlet replicates code from DfsServlet base class
  38. Improvement HDFS-16686
    GetJournalEditServlet fails to authorize valid Kerberos request
  39. Improvement HDFS-16684
    Exclude self from JournalNodeSyncer when using a bind host
  40. Bug HDFS-16552
    Fix NPE for TestBlockManager
  41. Improvement HDFS-16262
    Async refresh of cached locations in DFSInputStream
  42. Improvement HDFS-16266
    Add remote port information to HDFS audit log
  43. Improvement HDFS-16776
    Erasure Coding: The length of targets should be checked when DN gets a reconstruction task
  44. Bug HDFS-16766
    hdfs ec command loads (administrator provided) erasure code policy files without disabling xml entity expansion
  45. Improvement HDFS-16795
    Use secure XML parser utils in hdfs classes
  46. New Feature HDFS-16397
    Reconfig slow disk parameters for datanode
  47. New Feature HDFS-16396
    Reconfig slow peer parameters for datanode
  48. New Feature HDFS-16400
    Reconfig DataXceiver parameters for datanode
  49. New Feature HDFS-16399
    Reconfig cache report parameters for datanode
  50. Improvement HDFS-16352
    return the real datanode numBlocks in #getDatanodeStorageReport
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