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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