[GitHub] tillrohrmann opened a new pull request #6743: [FLINK-10411] Make ClusterEntrypoint more compositional

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tillrohrmann opened a new pull request #6743: [FLINK-10411] Make ClusterEntrypoint more compositional
URL: https://github.com/apache/flink/pull/6743
 
 
   ## What is the purpose of the change
   
   Introduce the `ClusterComponent` which encapsulates the logic for starting the cluster
   components, `Dispatcher`, `RestServerEndpoint` and the `ResourceManager`. The individual
   components are created by using a factory instance. The `ClusterEntrypoint` is now
   only responsible for managing the required services needed by the `ClusterComponent`.
   This design should make the testing of these components easier, improve reusability
   and reduce code duplication.
   
   Move the logic of when to exit the JVM process out of the `ClusterEntrypoint`
   so that the caller is now responsible to make this call. This improves the
   usage of the `ClusterEntrypoint` for testing purposes.
   
   ## Brief change log
   
   - Introduce `ClusterComponent` responsible for managing the cluster components: `Dispatcher`, `RestServerEndpoint` and `ResourceManager`
   - Introduce factories for the cluster components
   - Update existing `ClusterEntrypoints` to use the new `ClusterComponent`
   
   ## Verifying this change
   
   - Most changes are covered by existing tests since it is mainly restructuring code
   - Added `ClassPathJobGraphRetrieverTest` to test `ClassPathJobGraphRetriever`
   
   ## 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: (yes)
     - 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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