reswqa opened a new pull request, #23404:
URL: https://github.com/apache/flink/pull/23404
## What is the purpose of the change
*ChannelSelectorRecordWriter#broadcastEmit serialize the record to
ByteBuffer but didn't use it. It will re-serialize this record per-channel. We
should allows all channels to reuse the serialized buffer.*
## Brief change log
- *Reduce serialization overhead of broadcast emit from
ChannelSelectorRecordWriter.*
## Verifying this change
This change is already covered by existing tests, such as
`RecordWriterTest`*.
## 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
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