Github user tillrohrmann commented on the issue:
https://github.com/apache/flink/pull/2629
The `notifyCheckpointComplete` will mitigate the problem of adding latency
a little bit but not get rid of it because the tasks are only notified about a
completed checkpoint if the whole checkpoint (all operators have finished their
checkpoints) has succeeded. This can take a noticeable amount of time if you
have a complex topology.
I really would not like to build in a hand tailored solution for the
`AsyncWaitOperator` into the `StreamTask`. This is imo not a good design,
because the `StreamTask` should not know anything about the operators which are
executed within it.
I still think that the checkpoint lock would be a better solution because
then the `Emitter` thread can continue emitting elements right after the
checkpoint (local) has completed and we don't have to introduce custom control
logic for the `AsyncWaitOperator`.
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