leekeiabstraction opened a new pull request, #28816:
URL: https://github.com/apache/flink/pull/28816
## What is the purpose of the change
Add unit test to demonstrate that busy subtask thread may cause splits to be
marked as idle erroneously and cause dropped records
## Brief change log
Add the `testMultiSplitWithBusySubtask` parameterised test case
- The test case passes when subtask busy-ness is NOT simulated
- The test case fails (split marked as idle and records were emitted behind
watermark) when the subtask busyness is simulated. This demonstrates that
subtask busy-ness can impact the semantic of a Flink job
## Verifying this change
This PR adds test cases to demonstrate a bug.
## 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: 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
##### Was generative AI tooling used to co-author this PR?
- [X] Yes (please specify the tool below)
Generated-by: Claude Sonnet 5
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