[GitHub] flink pull request #6417: [FLINK-9913][runtime] Improve output serialization...

[zhijiangW <gi...@git.apache.org>]

GitHub user zhijiangW opened a pull request:

    https://github.com/apache/flink/pull/6417

    [FLINK-9913][runtime] Improve output serialization only once in RecordWriter

    ## What is the purpose of the change
    
    *This pull request improves the output serialization only once for multi target channels in `RecordWriter`, rather than serialization as many times as the number of selected channels.
    
    ## Brief change log
    
      - *Only one `RecordSerializer` is created for all the output channels in `RecordWriter`*
      - *Restructure the processes of `emit`, `broadcastEmit`, randomEmit` in `RecordWriter`*
      - *Restructure the interface methods in `RecordSerializer`*
    
    ## Verifying this change
    
    This change is already covered by existing tests, such as *SpanningRecordSerializationTest*, etc.
    
    And adds new tests in `RecordWriterTest` to verify:
    
      - *The serialization results are correct by `RecordWriter#emit` with `BroadcastPartitioner`*
      - *The serialization results are correct by `RecordWriter#broadcastEmit` directly*
    
    ## 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: (yes)
      - The runtime per-record code paths (performance sensitive): (yes)
      - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (no)
      - The S3 file system connector: (no)
    
    ## Documentation
    
      - Does this pull request introduce a new feature? (no)
      - If yes, how is the feature documented? (not applicable)


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

    $ git pull https://github.com/zhijiangW/flink FLINK-9913

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

    https://github.com/apache/flink/pull/6417.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 #6417
    
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commit 109ddb37abafcea28478b90cda10b965e0c399d5
Author: Zhijiang <wa...@...>
Date:   2018-07-25T05:45:23Z

    [FLINK-9913][runtime] Improve output serialization only once in RecordWriter

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