Github user shixiaogang commented on the issue:
https://github.com/apache/flink/pull/3359
@vpernin Thanks very much for your attention. The PR is supposed to work on
1.3-SNAPSHOT, but it's not testable now due to some known bugs.
Besides, i want to add support for asynchronous snapshots of timers in this
pull request. Currently, the snapshots for timers are taken synchronously ---
no stream record can be processed before the snapshots are taken. In our tests
where there are millions of timers, it takes approximately several seconds to
complete the snapshotting. The performance, hence, is significantly degraded
when the checkpoint frequency is large.
To allow asynchronous snapshotting, we need some refactoring on how
internal timer services are restored and snapshotted. Now
`InternalTimerService` s, similar to keyed states, are stored in
`KeyedStateBackend`. That way, we can benefit from the optimizations made on
the snapshotting of keyed states, taking snapshots asynchronously (and
incrementally in the near future).
I am working on this work right now. It's appreciated that you could help
test the feature when it is done.
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