Zakelly opened a new pull request, #25066:
URL: https://github.com/apache/flink/pull/25066
## What is the purpose of the change
This PR fixes the unstable test `SnapshotFileMergingCompatibilityITCase`.
There is a problem with the test code itself. The test verifies the cp files
are cleaned as expected, which depends on an async cleaner (the job io thread).
While the mini-cluster quit, the async threads may not have finished their jobs
before termination.
It is better to try multiple rounds AZP to verify this fix.
## Brief change log
Only `SnapshotFileMergingCompatibilityITCase`. Make it wait for file
deletion before cluster termination.
## Verifying this change
## 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, 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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