syhily opened a new pull request, #20500:
URL: https://github.com/apache/flink/pull/20500
## What is the purpose of the change
PulsarSink is a bit slow when we use the `At-Least-Once` or `Exactly-Once`.
This is because PulsarSink uses `MallboxExecutor` to write messages. A lot of
useless context switches and locks acquire happened when using this writing
policy. We should drop `MallboxExecutor` and send messages directly for better
performance.
## Brief change log
- Deprecated useless
`PulsarSinkOptions.PULSAR_MAX_PENDING_MESSAGES_ON_PARALLELISM` option.
- Remove the use of `MallboxExecutor` in `PulsarWriter`.
## Verifying this change
This change is already covered by existing tests, such as *PulsarWriterTest*.
## 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): (no)
- 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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