pnowojski opened a new pull request, #26453:
URL: https://github.com/apache/flink/pull/26453
Previously WatermarkAlignmentEvent was incorrectly ignored and never
sent if source enumerator had no more splits to assign/send.
This was causing deadlocks, with watermark aligmnent not being
able to progress in such cases.
## Verifying this change
Added new unit test and modified a pre-existing ITCase to cover for the
problematic situation.
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (yes / **no**)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (yes / **no**)
- The serializers: (yes / **no** / don't know)
- The runtime per-record code paths (performance sensitive): (yes / **no**
/ don't know)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (yes / **no** / don't
know)
- The S3 file system connector: (yes / **no** / don't know)
## Documentation
- Does this pull request introduce a new feature? (yes / **no**)
- If yes, how is the feature documented? (**not applicable** / docs /
JavaDocs / not documented)
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