PatrickRen opened a new pull request #14789:
URL: https://github.com/apache/flink/pull/14789
## What is the purpose of the change
This pull request fixes bug in ```KafkaSourceEnumerator``` that only sending
```NoMoreSplitsEvent``` to readers assigned with splits, which will lead to job
hanging forever even if the source is bounded.
## Brief change log
*(for example:)*
- Signal ```NoMoreSplitsEvent``` to reader in ```addReader``` and
```addSplitsBack``` instead of during split assigning
- Add IT case for testing cases that a reader is not assigned with any
splits
- Fix a typo in JavaDoc of SplitEnumeratorContext#callAsync
## Verifying this change
This change added tests and can be verified as follows:
- *Add IT case for testing cases that a reader is not assigned with any
splits*
## 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/Mesos, 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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