PatrickRen opened a new pull request #16870:
URL: https://github.com/apache/flink/pull/16870
## What is the purpose of the change
This pull request fixes a bug that empty split is only unassigned from
KafkaConsumer but not be cleaned up in SplitFetcher.
## Brief change log
- Add a set for tracking splits discovered empty at
```KafkaPartitionSplitReader#handleSplitsChanges```
- Mark empty splits in the set above as finished in
```KafkaPartitionSplitReader#fetch```
## Verifying this change
This change added tests and can be verified as follows:
- Assign an empty split to ```KafkaPartitionSplitReader```
- Make a fetch and check if the empty split is added to finished split in
the returning ```RecordsWithSplitIds```
## 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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