[GitHub] [flink] pnowojski opened a new pull request #8467: [FLINK-12535][network] Make CheckpointBarrierHandler non-blocking

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pnowojski opened a new pull request #8467: [FLINK-12535][network] Make CheckpointBarrierHandler non-blocking
URL: https://github.com/apache/flink/pull/8467
 
 
   This change makes `CheckpointBarrierHandler` a non blocking class with similar interface as `InputGate`. This is one step towards a mailbox model.
   
   ## 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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