Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/2785
It's not about timing guarantees here, only about order of running timers.
The problem is that they are sorted by the delay which is affected by
races/stalls, rather than by proper timestamp.
Since Flink actually relies on timer triggering order, I think we need to
implement our own timer service, which sorts by actual timestamp, rather than
by delay.
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