Github user bjlovegithub commented on the issue:
https://github.com/apache/flink/pull/2629
Good point ;D
Emm, I think we have to override the
`StreamOpeartor.notifyCheckpointComplete()` for `AsyncWaitOpeartor` so that
once the `TaskManager` notifies the `Task` that checkpoint has completed, the
`EmitterThread` can start working as soon as possible.
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