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  1. Sub-task HDFS-2870
    HA: Remove some INFO level logging accidentally left around
  2. Sub-task HDFS-2820
    Add a simple sanity check for HA config
  3. Sub-task HDFS-2714
    HA: Fix test cases which use standalone FSNamesystems
  4. Sub-task HDFS-2523
    NameNode needs to add HAServiceProtocol to its RPC Server
  5. Sub-task HDFS-2680
    DFSClient should construct failover proxy with exponential backoff
  6. Sub-task HDFS-2934
    HA: Allow configs to be scoped to all NNs in the nameservice
  7. Sub-task HDFS-2859
    LOCAL_ADDRESS_MATCHER.match has NPE when called from DFSUtil.getSuffixIDs when the host is incorrect
  8. Sub-task HDFS-2858
    DFSUtil.getSuffixIDs silently ignores exception in NetUtils.createSocketAddr
  9. Sub-task HDFS-2972
    HA: small optimization building incremental block report
  10. Sub-task HDFS-2948
    HA: NN throws NPE during shutdown if it fails to startup
  11. Sub-task HDFS-2915
    HA: TestFailureOfSharedDir.testFailureOfSharedDir() has race condition
  12. Sub-task HDFS-2947
    HA: On startup NN throws an NPE in the metrics system
  13. Sub-task HDFS-2890
    HA: DFSUtil#getSuffixIDs should skip unset configurations
  14. Sub-task HDFS-3035
    HA: fix failure of TestFileAppendRestart due to OP_UPDATE_BLOCKS
  15. Sub-task HDFS-2625
    HA: TestDfsOverAvroRpc failing after introduction of HeartbeatResponse type
  16. Sub-task HDFS-2622
    HA: fix TestDFSUpgrade on HA branch
  17. Sub-task HDFS-2928
    HA: ConfiguredFailoverProxyProvider should not create a NameNode proxy with an underlying retry proxy
  18. Sub-task HDFS-2939
    HA: TestHAStateTransitions fails on Windows
  19. Sub-task HDFS-1973
    HA: HDFS clients must handle namenode failover and switch over to the new active namenode.
  20. Sub-task HDFS-2679
    Add interface to query current state to HAServiceProtocol
  21. Sub-task HDFS-2677
    HA: Web UI should indicate the NN state
  22. Sub-task HDFS-2586
    Add protobuf service and implementation for HAServiceProtocol
  23. Sub-task HDFS-2582
    Scope dfs.ha.namenodes config by nameservice
  24. Sub-task HDFS-2579
    Starting delegation token manager during safemode fails
  25. Sub-task HDFS-2291
    HA: Checkpointing in an HA setup
  26. Sub-task HDFS-2942
    HA: TestActiveStandbyElectorRealZK fails if build dir does not exist
  27. Sub-task HDFS-2937
    HA: TestDFSHAAdmin needs tests with MiniDFSCluster
  28. Sub-task HDFS-2935
    HA: Shared edits dir property should be suffixed with nameservice and namenodeID
  29. Sub-task HDFS-2926
    HA: enable hadoop security authorization for haadmin / protocols
  30. Sub-task HDFS-2920
    HA: fix remaining TODO items
  31. Sub-task HDFS-2917
    HA: haadmin should not work if run by regular user
  32. Sub-task HDFS-2805
    HA: Add a test for a federated cluster with HA NNs
  33. Sub-task HDFS-2811
    HA: Client should fail if a failover occurs which switches block pool ID
  34. Sub-task HDFS-2737
    HA: Automatically trigger log rolls periodically on the active NN
  35. Sub-task HDFS-2736
    HA: support 2NN with SBN
  36. Sub-task HDFS-2735
    HA: add tests for multiple shared edits dirs
  37. Sub-task HDFS-2733
    Document HA configuration and CLI
  38. Sub-task HDFS-2732
    Add support for the standby in the bin scripts
  39. Sub-task HDFS-2730
    HA: Refactor shared HA-related test code into HATestUtils class
  40. Sub-task HDFS-2977
    HA: TestBalancerWithHANameNodes is failing
  41. Sub-task HDFS-2974
    HA: MiniDFSCluster does not delete standby NN name dirs during format
  42. Sub-task HDFS-2973
    HA: re-enable NO_ACK optimization for block deletion
  43. Sub-task HDFS-2905
    HA: Standby NN NPE when shared edits dir is deleted
  44. Sub-task HDFS-2903
    HA: NPE if shared edits directory is not available during failover
  45. Sub-task HDFS-2901
    HA: Improvements for SBN web UI - not show under-replicated/missing blocks
  46. Sub-task HDFS-2863
    Failures observed if dfs.edits.dir and shared.edits.dir have same directories.
  47. Sub-task HDFS-2860
    HA: TestDFSRollback#testRollback is failing
  48. Sub-task HDFS-2838
    HA: NPE in FSNamesystem when in safe mode
  49. Sub-task HDFS-2794
    HA: Active NN may purge edit log files before standby NN has a chance to read them
  50. Sub-task HDFS-2792
    HA: Make fsck work
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