[jira] [Created] (FLINK-2846) Emit checkpoint barriers earlier, before drawing the state snapshot

["Stephan Ewen (JIRA)" <ji...@apache.org>]

Stephan Ewen created FLINK-2846:
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             Summary: Emit checkpoint barriers earlier, before drawing the state snapshot
                 Key: FLINK-2846
                 URL: https://issues.apache.org/jira/browse/FLINK-2846
             Project: Flink
          Issue Type: Improvement
          Components: Streaming
    Affects Versions: 0.10
            Reporter: Stephan Ewen
            Assignee: Stephan Ewen
             Fix For: 0.10


State snapshot drawing and downstream barrier emitting occur in an atomic scope. Currently, the barriers are emitted after the state snapshot has been drawn.

There is no reason why the barriers could not be emitted at the beginning of the atomic scope, and it would reduce the short stalls in the streaming pipeline when drawing the state snapshot of an operator checkpoint.



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