Github user gyfora commented on the pull request:
https://github.com/apache/flink/pull/879#issuecomment-118008845
Also maybe it is completely unnecessary to automatically attach a source
timestamp if we don't have any windowing operators.
One other thing that came into my mind: in order to keep "deterministic"
results after failure we should persist data with the timestamp attached at the
sources. Are we planning to do this? I guess this question goes hand in hand
with the automatic source level backup even without kafka. I just wanted to
bring it up.
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