Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/1668#issuecomment-200909639
The core idea of this is very good, also the illustration is very nice.
After an offline chat with @senorcarbone, we concluded that a remaining
problem in this is currently the way it integrates with the timeout-based
termination detection.
Which brings us to the point that we should (in my opinion) change the way
that loops terminate. It should probably be based on end-of-stream events, to
make it deterministic and not susceptible to delays.
Question is now, does it make sense to do the termination change first, and
base this on top of it, or to merge this irrespective of that...
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