rkhachatryan opened a new pull request #12700:
URL: https://github.com/apache/flink/pull/12700
**This PR is WIP**
## What is the purpose of the change
Wait for the `LegacySourceFunctionThread` to finish when cancelling the task.
This prevents premature freeing of resources, particularly LibraryCache.
## Brief change log
- Join `sourceThread` in `SourceStreamTask.cancelTask`
- Add wait timeout to have time for cleanup - this is quite invasive but
independent change - so I extracted this to a separate commit
## Verifying this change
TBD.
Unit test seems to be not enough; full test is non-trivial;
## 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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