[GitHub] tillrohrmann opened a new pull request #6734: [FLINK-9455][RM] Add support for multi task slot TaskExecutors

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tillrohrmann opened a new pull request #6734: [FLINK-9455][RM] Add support for multi task slot TaskExecutors
URL: https://github.com/apache/flink/pull/6734
 
 
   ## What is the purpose of the change
   
   This PR adds support for multi task slot TaskExecutors to Flink. Before it was recommended to start a Flink cluster with single slot `TaskExecutors`. Now also multi slot `TaskExecutors` can be configured and Flink won't allocate resources over-excessively.
   
   ## Brief change log
   
   - Extend `ResourceActions#allocateResource` to return `Collection<ResourceProfile>` indicating the set of slots to expect
   - Store expected slots as `PendingTaskManagerSlot`
   - Use `PendingTaskManagerSlot` to fulfill `PendingSlotRequest`
   - Only ask for new resources if there are no more `TaskManagerSlots` and `PendingTaskManagerSlots`
   
   ## Verifying this change
   
   - Added `SlotManagerTest#`: `testRequestNewResources`, `testFailingAllocationReturnsPendingTaskManagerSlot`, `testPendingTaskManagerSlotCompletion`, `testRegistrationOfDifferentSlot`, `testOnlyFreeSlotsCanFulfillPendingTaskManagerSlot`, 
   
   ## 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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