[jira] [Created] (FLINK-4894) Don't block on buffer request after broadcastEvent

[Shang Yuanchun (Jira)]

Ufuk Celebi created FLINK-4894:
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             Summary: Don't block on buffer request after broadcastEvent
                 Key: FLINK-4894
                 URL: https://issues.apache.org/jira/browse/FLINK-4894
             Project: Flink
          Issue Type: Improvement
            Reporter: Ufuk Celebi


After broadcasting an event (like the checkpoint barrier), the record writer might block on a buffer request although that buffer will only be needed on the next write on that channel.

Instead of assuming that each serializer has a buffer set, we can change the logic in the writer to request the buffer when it requires one.



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