kezhuw opened a new pull request #13989:
URL: https://github.com/apache/flink/pull/13989
## What is the purpose of the change
Synchronize `fetchers.isEmpty` status to `SourceReaderBase` using
`elementsQueue.notifyAvailable()`.
## Brief change log
* Add test case to fail empty queue assumption in
`SourceReaderBase.finishedOrAvailableLater`.
* Correct empty queue assumption by returning `InputStatus.MORE_AVAILABLE`
if not empty.
* Synchronize `fetchers.isEmpty` status to `SourceReaderBase` using
`elementsQueue.notifyAvailable()`.
## Verifying this change
This change is already covered by existing tests, such as:
* `CoordinatedSourceITCase.testEnumeratorReaderCommunication`.
This change added tests and can be verified as follows:
* `SourceReaderBaseTest.testMultipleSplitsWithSeparatedFinishedRecord`
## 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)
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