Zakelly opened a new pull request, #24832:
URL: https://github.com/apache/flink/pull/24832
## What is the purpose of the change
Currently, when there is a state request finished, a callback will be
wrapped into a mail and inserted into the `Mailbox`. This PR put a batch of
consecutive callbacks into one mail and execute them in batch, which reduce the
interaction with the queue of mailbox. Additionally, the new introduced runner
propagate the flag `hasMail`, which is essential for fine-grained scheduling of
`AsyncExecutionController` (will exposed in later PR).
## Brief change log
- Introduce `BatchCallbackRunner` that receives single callbacks and run
them in batch.
## Verifying this change
This change is already covered by existing tests on `AEC`.
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): no
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: no
- The serializers: no
- The runtime per-record code paths (performance sensitive): yes
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: no
- The S3 file system connector: no
## Documentation
- Does this pull request introduce a new feature? no
- If yes, how is the feature documented? not applicable
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