Github user aljoscha commented on the pull request:
https://github.com/apache/flink/pull/1988#issuecomment-220002453
@gyfora Yes, this is correct. We'll have to put the timers into partitioned
state and upon restarting iterate over the saved timers to re-set any callbacks
at the `StreamTask`.
Doing this naively would slow things down. What I had in mind is to still
keep the timers in an in-memory `Map` but before snapshotting put them into a
partitioned state. This way, we don't have the overhead every time that we deal
with timers but just when checkpointing.
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