Github user aljoscha commented on the issue:
https://github.com/apache/flink/pull/2124
This looks very good! I just have a few minor comments:
* It's very good that you fixed typos and added comments/Javadoc to
previously undocumented code. I would like to see them as a separate PR,
though, and keep this PR only to the feature mentioned in the Jiras.
* You added `TestTimeServiceProvider` in two tests. I think it makes sense
to move this to the same package as `DefaultTimerService` and clearly mark it
as being for testing only. On a related note, it might make sense to normalize
the names, right now there is `*TimeServiceProvider` and `*TimerService`.
* You added the additional method `registerTimer(final long timestamp,
final Runnable target)`. I imagine it is because the sources register their
watermark timers as a `Runnable`. I think it would be better to keep having
only `Triggerable` here. The watermark emitters should also work as a
`Triggerable`.
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