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  1. Sub-task YARN-2615
    ClientToAMTokenIdentifier and DelegationTokenIdentifier should allow extended fields
  2. Sub-task YARN-2613
    NMClient doesn't have retries for supporting rolling-upgrades
  3. Sub-task YARN-2561
    MR job client cannot reconnect to AM after NM restart.
  4. Sub-task YARN-2464
    Provide Hadoop as a local resource (on HDFS) which can be used by other projects
  5. Sub-task YARN-2347
    Consolidate RMStateVersion and NMDBSchemaVersion into StateVersion in yarn-server-common
  6. Sub-task YARN-2289
    ApplicationHistoryStore should be versioned
  7. Sub-task YARN-2288
    Data persistent in timelinestore should be versioned
  8. Sub-task YARN-2278
    YARN RPC should support Protocol Version in client/server
  9. Sub-task YARN-2227
    Move containerMgrProxy from RM's AMLaunch to get rid of issues that new client talking with old server
  10. Sub-task YARN-2045
    Data persisted in NM should be versioned
  11. Sub-task YARN-819
    ResourceManager and NodeManager should check for a minimum allowed version
  12. Sub-task YARN-671
    Add an interface on the RM to move NMs into a maintenance state
  13. Sub-task YARN-670
    Add an Exception to indicate 'Maintenance' for NMs and add this to the JavaDoc for appropriate protocols
  14. Sub-task YARN-669
    ContainerTokens sent from the RM to NM via the AM should be a byte field
  15. Sub-task YARN-668
    TokenIdentifier serialization should consider Unknown fields
  16. Sub-task YARN-667
    Data persisted in RM should be versioned
  17. Sub-task YARN-38
    Add an option to drain the ResourceManager of all apps for upgrades
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