Github user gyfora commented on the pull request:
https://github.com/apache/flink/pull/1668#issuecomment-187827823
I can't really add anything to the timeout question :D
As for the snapshotting. I would go with the ListState as that potentially
provides very efficient implementation for this logging phase. (It is actually
designed to handle this) Then we don't have to worry about spilling there
either.
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