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  1. Sub-task HDFS-8658
    Improve retry attempt log in DFSOutputStream#completeFile with current attempt number
  2. Sub-task HDFS-8423
    Add additional trace to DataNode#shutdown to track progress
  3. Sub-task HDFS-7408
    Add a counter in the log that shows the number of block reports processed
  4. Sub-task HDFS-7388
    Improve the log for HA failover
  5. Sub-task HDFS-7327
    Adding additional tracing for memory storage eviction algorithm
  6. Sub-task HDFS-7121
    For JournalNode operations that must succeed on all nodes, execute a pre-check to verify that the operation can succeed.
  7. Sub-task HDFS-7120
    When aborting NameNode or JournalNode due to metadata file problems, write the contents of the metadata directories and permissions to logs.
  8. Sub-task HDFS-7119
    Split error checks in AtomicFileOutputStream#close into separate conditions to improve diagnostics.
  9. Sub-task HDFS-7118
    Improve diagnostics on storage directory rename operations by using NativeIO#renameTo in Storage#rename.
  10. Sub-task HDFS-6385
    Show when block deletion will start after NameNode startup in WebUI
  11. Sub-task HDFS-6353
    Check and make checkpoint before stopping the NameNode
  12. Sub-task HDFS-6186
    Pause deletion of blocks when the namenode starts up
  13. Sub-task HDFS-5986
    Capture the number of blocks pending deletion on namenode webUI
  14. Sub-task HDFS-5951
    Provide diagnosis information in the Web UI
  15. Sub-task HDFS-4923
    Save namespace when the namenode is stopped
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