Github user aljoscha commented on the issue:
https://github.com/apache/flink/pull/2785
@StephanEwen I think it's not a problem that these physical, low-level
timers don't fire in order of their timestamp because the ordering of timers is
maintained in the implementation of `InternalTimerService` (in a queue in the
current implementation). Also, under normal circumstances we only have one
active timer at the `ProcessingTimeService` (`SystemProcessingTimeService`).
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