Github user aljoscha commented on the pull request:
https://github.com/apache/flink/pull/879#issuecomment-118037363
Ok, the test results I posted earlier seem correct. I also ran the tests on
my machine with two TaskManagers, There the result is the same for
master/event-time/event-time-marks-every-500. The overhead seems to not be from
the additional object creation/joda.time.Instant but from the additional
network traffic or from other effects that happen with the network and
watermarks.
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