pnowojski opened a new pull request, #24895:
URL: https://github.com/apache/flink/pull/24895
## What is the purpose of the change
Currently many operators when processing watermarks, are firing multiple
timers each producing potentially multiple output records. If this happens
under back-pressure, it can quite easily block the subtask thread in the hard
back-pressure state for an extended period of time blocking mailbox from
processing any incoming mails, like processing checkpoint barriers and
completing unaligned checkpoints.
To address this issue, we would like to propose to make firing multiple
timers interruptible in such a way, that Flink would be able to interrupt
firing timers, perform checkpoint and return back to firing timers.
## Brief change log
Please check individual commit messages.
## Verifying this change
Covered by both existing tests and added new tests.
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (yes / **no**)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (**yes** / no)
- The serializers: (yes / **no** / don't know)
- The runtime per-record code paths (performance sensitive): (**yes** / no
/ don't know)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (yes / **no** / don't
know)
- The S3 file system connector: (yes / **no** / don't know)
## Documentation
- Does this pull request introduce a new feature? (**yes** / no)
- If yes, how is the feature documented? (not applicable / **docs** /
**JavaDocs** / not documented)
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