[GitHub] zhijiangW opened a new pull request #7199: [FLINK-10662][network] Refactor the ChannelSelector interface for single selected channel

[GitBox <gi...@apache.org>]

zhijiangW opened a new pull request #7199: [FLINK-10662][network] Refactor the ChannelSelector interface for single selected channel
URL: https://github.com/apache/flink/pull/7199
 
 
   ## What is the purpose of the change
   
   *In `ChannelSelector#selectChannels`, it would return an array for selected channels. But considering specific implementations, only `BroadcastPartitioner` would select all the channels, and other implementations will select one channel.*
    
   *So we can simple this interface to return single channel index for benefiting performance, and specialize the `BroadcastPartitioner` in a more efficient way.*
   
   ## Brief change log
   
     - *Refactor the `selectChannel` method in `ChannelSelector` interface*
     - *Adjust the related processes in `RecordWriter`*
     - *Fix the related tests because of interface change*
   
   ## Verifying this change
   
   This change is already covered by existing tests, such as *OutputEmitterTest* and *RecordWriterTest*.
   
   ## 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): (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)
   

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