Github user rtudoran commented on the issue:
https://github.com/apache/flink/pull/3641
@fhueske Thanks for the feedback.
It has on the one hand that the few events that arrive with the same
proctime are not computed iteratively, but in a batch (all in the same time - 1
ms later), but it avoids all the mess of having strong synchronization in case
there is no explicit and fixed order of execution between the 2 functions (as
per my example in the mailing list)
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