GitHub user sihuazhou opened a pull request:

    [FLINK-8699][hotfix] Fix in concurrency problem for full Checkpoint.

    This PR fix [FLINK-8699]( 
In fully checkpoint, `kvStateInformation` is not a copied object and it can be 
changed when writeKVStateMetaData() is invoking ... This can lead to 
problematic, which is serious.
    ## Brief change log
    - Copy `kvStateInformation` to avoid concurrency problem.
    ## Verifying this change
    - This change can be verified by the existed unit tests.
    ## 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: (yes)
      - The S3 file system connector: (no)
    ## Documentation
      - Does this pull request introduce a new feature? (no)

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

    $ git pull hotfix_full_checkpoint

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

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

    This closes #5525
commit de191cdd8ab6073cd6c06c3c3f0174f15c08369a
Author: sihuazhou <summerleafs@...>
Date:   2018-02-19T12:13:58Z

    fix in concurrency problem for full Checkpoint.



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