Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/4220
We have to also consider anther aspect: Changing this from a synchronous
call to an asynchronous callback makes new types of races possible, against
which we need to guard.
We need to make sure that the `restart()` call cannot succeed if there was
another cycle of failure that goes into `RESTARTING`.
I would suggest to address https://issues.apache.org/jira/browse/FLINK-6667
first, so that the callback can check that the `globalModVersion` is unchanged
upon restart. Then there is no anger in moving this to an asynchronous callback.
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