Github user d2r commented on the pull request:
https://github.com/apache/storm/pull/900#issuecomment-162641124
> @d2r It seems to be due to timing issues since the unit tests relied on
Thread.sleep(). I've removed sleep and updated WaterMarkEventGeneratorTest to
trigger manually.
>
> Will also review other unit tests for similar issues.
OK, sounds good to me. Thanks.
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