Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/1147#issuecomment-142098492
Concerning Watermarks: I think that is the assumption right now, yes.
Since the operators produce records with timestamps based on their
processing time, they cannot simply forward watermarks. They should be able to
auto-generate watermarks based on their processing time, but I am not sure if
that is what we would want...
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