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  1. Flink
  2. FLINK-20217

More fine-grained timer processing

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      Timers are currently processed in one big block under the checkpoint lock (under InternalTimerServiceImpl#advanceWatermark. This can be problematic in a number of scenarios while doing checkpointing which would lead to checkpoints timing out (and even unaligned checkpoints would not help).

      If you have a huge number of timers to process when advancing the watermark and the task is also back-pressured, the situation may actually be worse since you would block on the checkpoint lock and also wait for buffers/credits from the receiver.

      I propose to make this loop more fine-grained so that it is interruptible by checkpoints, but maybe there is also some other way to improve here.

      This issue has been for example observed here: https://lists.apache.org/thread/f6ffk9912fg5j1rfkxbzrh0qmp4w6qry

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              Unassigned Unassigned
              nkruber Nico Kruber
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