GitHub user zhangminglei opened a pull request:

    https://github.com/apache/flink/pull/4482

    [FLINK-4534] Fix synchronization issue in BucketingSink

    ## What is the purpose of the change
    
    Fix lacking of synchronization in BucketingSink#close method.
    
    ## Verifying this change
    
    This change is a trivial work without any test coverage.
    
    ## 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)
    
    ## Documentation
    
      - Does this pull request introduce a new feature? (no)
    


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

    $ git pull https://github.com/zhangminglei/flink flink-4534

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

    https://github.com/apache/flink/pull/4482.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 #4482
    
----
commit 7fa19abf93dcc6891d45dc73bb5a6caf16cf34fd
Author: zhangminglei <zml13856086...@163.com>
Date:   2017-08-05T04:04:43Z

    [FLINK-4534] Fix synchronization issue in BucketingSink

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