[GitHub] Guibo-Pan opened a new pull request #6544: [FLINK-8532] [Streaming] modify RebalancePartitioner to use a random partition as its first partition

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

Guibo-Pan opened a new pull request #6544: [FLINK-8532] [Streaming] modify RebalancePartitioner to use a random partition as its first partition
URL: https://github.com/apache/flink/pull/6544
 
 
   
   ## What is the purpose of the change
   This pull request makes RebalancePartitioner to use a random partition as its first partition, rather than the same 0th. In this way we avoid message sending to the same subtask at one moment, which may cause lag of the subtask, and make some other subtask with no message arrived to be idle. This helps RebalancePartitioner balance message better, and increase throughput.
   
   
   ## Brief change log
     - RebalancePartitioner starts with a random partition rather than the same 0th partition
     - corresponding RebalancePartitionerTest
   
   
   ## Verifying this change
   
   
   This change is already covered by existing tests, such as RebalancePartitionerTest.
   
   
   ## 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): ( don't know)
     - 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)

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