Github user aljoscha commented on the pull request:
https://github.com/apache/flink/pull/1750#issuecomment-191695612
Yes, right now we favor correctness over completeness. For example in a
Count window, if we emitted an unfinished count window then the count of the
elements in the window would not be what the user specified.
For Event-Time windows we are correct in emitting a window upon arrival of
the final Long.MAX_VALUE watermark.
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