zhijiangW opened a new pull request #8763: [FLINK-12843][network] Refactor the 
pin logic in ReleaseOnConsumptionResultPartition
URL: https://github.com/apache/flink/pull/8763
 
 
   ## What is the purpose of the change
   
   *The pin logic is for adding the reference counter based on number of 
subpartitions for `ReleaseOnConsumptionResultPartition`. It seems not necessary 
to do it in while loop as now, because the atomic counter would not be accessed 
by other threads during pin. If the `ReleaseOnConsumptionResultPartition` was 
not created yet, the `createSubpartitionView` would not be called actually 
resulting in`PartitionNotFoundException`. So we could simple increase the 
reference counter in `ReleaseOnConsumptionResultPartition` constructor 
directly.*
   
   ## Brief change log
   
     - *Remove `pin` method in `ResultPartition`*
     - *Remove `pin` method in `ReleaseOnConsumptionResultPartition` and adds 
the ref counter in constructor*
   
   ## Verifying this change
   
   *Covered by `ReleaseOnConsumptionResultPartitionTest`.
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): (yes / **no**)
     - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: (yes / **no**)
     - The serializers: (yes / **no** / don't know)
     - The runtime per-record code paths (performance sensitive): (yes / **no** 
/ don't know)
     - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Yarn/Mesos, ZooKeeper: (yes / **no** / don't know)
     - The S3 file system connector: (yes / **no** / don't know)
   
   ## Documentation
   
     - Does this pull request introduce a new feature? (yes / **no**)
     - If yes, how is the feature documented? (**not applicable** / docs / 
JavaDocs / not documented)

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