[GitHub] zhijiangW opened a new pull request #7037: [FLINK-10790][network] Refactor StreamPartitioner implementations into runtime module

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zhijiangW opened a new pull request #7037: [FLINK-10790][network] Refactor StreamPartitioner implementations into runtime module
URL: https://github.com/apache/flink/pull/7037
 
 
   ## What is the purpose of the change
   
   *Before refactoring `ChannelSelector` interface mentioned in [FLINK-10662](https://issues.apache.org/jira/browse/FLINK-10622), we found there are many duplicated implementations for `ChannelSelector` in stream and batch modes separately. The root cause is that they are locating in different modules, so can not reference each other.*
   
   *The core runtime codes should be unified for both stream and batch modes as much as possible, then we can reduce the work overhead to maintain the duplicated codes, especially for the following refactor.*
   
   *Next we would remove duplicated implementations for `OutputEmitter` and `RoundRobinChannelSelector`.*
   
   ## Brief change log
   
     - *Refactor the existing partitioner package from `flink-streaming-jave` to `flink-runtime`.*
     - *Remove `StreamRecord` type explicitly from `SerializationDelegate`.*
     - *Modify related tests based on refactor changes.*
   
   
   ## Verifying this change
   
   *This change is already covered by existing 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: (yes)
     - The runtime per-record code paths (performance sensitive): (no)
     - 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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