1. Sub-task HDFS-13789
    Reduce logging frequency of QuorumJournalManager#selectInputStreams
  2. Sub-task HDFS-14142
    Move ipfailover config key out of HdfsClientConfigKeys
  3. Sub-task HDFS-13873
    ObserverNode should reject read requests when it is too far behind.
  4. Sub-task HDFS-13851
    Remove AlignmentContext from AbstractNNFailoverProxyProvider
  5. Sub-task HDFS-13872
    Only some protocol methods should perform msync wait
  6. Sub-task HDFS-13924
    Handle BlockMissingException when reading from observer
  7. Sub-task HDFS-13923
    Add a configuration to turn on/off observer reads
  8. Sub-task HDFS-13925
    Unit Test for transitioning between different states
  9. Sub-task HDFS-13791
    Limit logging frequency of edit tail related statements
  10. Sub-task HDFS-13782
    ObserverReadProxyProvider should work with IPFailoverProxyProvider
  11. Sub-task HDFS-13781
    Unit tests for standby reads.
  12. Sub-task HDFS-13780
    Postpone NameNode state discovery in ObserverReadProxyProvider until the first real RPC call.
  13. Sub-task HDFS-13779
    Implement performFailover logic for ObserverReadProxyProvider.
  14. Sub-task HDFS-13778
    TestStateAlignmentContextWithHA should use real ObserverReadProxyProvider instead of AlignmentContextProxyProvider.
  15. Sub-task HDFS-14059
    Test reads from standby on a secure cluster with Configured failover
  16. Sub-task HDFS-14058
    Test reads from standby on a secure cluster with IP failover
  17. Sub-task HDFS-14035
    NN status discovery does not leverage delegation token
  18. Sub-task HDFS-13331
    Add lastSeenStateId to RpcRequestHeader.
  19. Sub-task HDFS-14067
    Allow manual failover between standby and observer
  20. Sub-task HDFS-14017
    ObserverReadProxyProviderWithIPFailover should work with HA configuration
  21. Sub-task HDFS-14016
    ObserverReadProxyProvider should enable observer read by default
  22. Sub-task HDFS-13610
    [Edit Tail Fast Path Pt 4] Cleanup: integration test, documentation, remove unnecessary dummy sync
  23. Sub-task HDFS-13609
    [Edit Tail Fast Path Pt 3] NameNode-side changes to support tailing edits via RPC
  24. Sub-task HDFS-13608
    [Edit Tail Fast Path Pt 2] Add ability for JournalNode to serve edits via RPC
  25. Sub-task HDFS-13607
    [Edit Tail Fast Path Pt 1] Enhance JournalNode with an in-memory cache of recent edit transactions
  26. Sub-task HDFS-13399
    Make Client field AlignmentContext non-static.
  27. Sub-task HDFS-13578
    Add ReadOnly annotation to methods in ClientProtocol
  28. Sub-task HDFS-14116
    Fix class cast error in NNThroughputBenchmark with ObserverReadProxyProvider.
  29. Sub-task HDFS-14160
    ObserverReadInvocationHandler should implement RpcInvocationHandler
  30. Sub-task HDFS-14155
    Update "Consistent Read from Observer" User Guide with Edit Tailing Frequency
  31. Sub-task HDFS-14154
    Document dfs.ha.tail-edits.period in user guide.
  32. Sub-task HDFS-14094
    Fix the order of logging arguments in ObserverReadProxyProvider.
  33. Sub-task HDFS-13961
    TestObserverNode refactoring
  34. Sub-task HDFS-14146
    Handle exception from internalQueueCall
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