Github user StefanRRichter commented on the issue:
https://github.com/apache/flink/pull/3602
Thanks for the review, @StephanEwen ! A agree with undoing
`MemoryStateBackend` and `MathUtil` as proposed, but would argue for keeping
the change in `TimeWindow`. This change fixes skew problems with the old way
the hash code was generated (being timestamps, typically only a small bandwith
of bits in the hash code was used by the other approach). This skew can have
particular impact in the new, flattened hashmap structure of the async backends.
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