Github user rtudoran commented on the issue:
https://github.com/apache/flink/pull/3607
@fhueske @sunjincheng121 @stefanobortoli
I have made an implementation also for implementing the management of the
events in the buffer based on MapState as suggested in #3590
I also tested the performance of the 2 approaches (ValueState[Queue] vs
MapState[Long, JList]) for small windows (2000) and large (10K) and they are
roughly the same. Considering this, i still think that having the order is a
good gain but both approaches are available to be integrated so you can
pick/vote
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