GitHub user sihuazhou opened a pull request:

    https://github.com/apache/flink/pull/6306

    [FLINK-9804][state] KeyedStateBackend.getKeys() does not work on RocksDB 
MapState

    ## What is the purpose of the change
    
    *This PR fixes the bug that the KeyedStateBackend.getKeys() does not work 
on RocksDB MapState.*
    
    
    ## Brief change log
    
      - *Change `RocksDBKeyedStateBackend#RocksIteratorForKeysWrapper()` to let 
it support get keys for RocksDB MapState.*
    
    
    ## Verifying this change
    
      - *Added `StateBackendTestBase#testMapStateGetKeys()` to guard the 
changes*
    
    ## Does this pull request potentially affect one of the following parts:
    
      - Dependencies (does it add or upgrade a dependency): (no)
      - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: (no)
      - The serializers: (no)
      - The runtime per-record code paths (performance sensitive): (no)
      - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Yarn/Mesos, ZooKeeper: (no)
      - The S3 file system connector: (no)
    
    ## Documentation
    
    - No

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/sihuazhou/flink FLINK-9804

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/flink/pull/6306.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #6306
    
----
commit efc4096a4a6f38b3acb0b5189804f7b452218f23
Author: sihuazhou <summerleafs@...>
Date:   2018-07-11T12:35:22Z

    fix KeyedStateBackend.getKeys() for RocksDBMapState.

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