[GitHub] flink issue #5400: [FLINK-8547][network] Implement CheckpointBarrierHandler ...

[zhijiangW]

Github user zhijiangW commented on the issue:

    https://github.com/apache/flink/pull/5400
  
    @pnowojski , I have changed the `EXACTLY_ONCE_BLOCKING_DATA_ENABLED` as 
true and squashed the commits.


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