becketqin opened a new pull request #11856:
URL: https://github.com/apache/flink/pull/11856
## What is the purpose of the change
This patch fixes a bug that when `SplitFetcher.wakeup()` is invoked, the
fetcher thread may be interrupted and thus lose the record.
## Brief change log
1. Fix the wakeup handling in `SplitFetcher`
2. Added unit tests for wakeup correctness.
3. Fixed a bug in `MockSplitReader` to handle interruptions.
## Verifying this change
Added unit test `SplitFetcherTest` for the correctness of wakeup. The tests
keeps waking up a fetcher thread to ensure the result delivered by the fetcher
thread is still in order without duplication.
## 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): (yes)
- 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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