[GitHub] [flink] carp84 opened a new pull request #8122: [FLINK-12121] [State Backends] Use composition instead of inheritance for the InternalKeyContext logic in backend

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carp84 opened a new pull request #8122: [FLINK-12121] [State Backends] Use composition instead of inheritance for the InternalKeyContext logic in backend
URL: https://github.com/apache/flink/pull/8122
 
 
   ## What is the purpose of the change
   
   This PR changes keyed backend to use composition instead of inheritance for the `InternalKeyContext` logic.
   
   
   ## Brief change log
   
   Introduced a new `InternalKeyContextImpl` and use it as a field in keyed backend, instead of making `KeyedStateBackend` implementing `InternalKeyContext` interface.
   
   
   ## Verifying this change
   
   This change is already covered by existing tests, such as all tests under `org.apache.flink.runtime.state` package.
   
   ## 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)
     - 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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