becketqin opened a new pull request #18745:
URL: https://github.com/apache/flink/pull/18745
## What is the purpose of the change
Currently the closing sequence of the `OperatorCoordinator` does not swallow
the exceptions thrown in the middle. So when exception is thrown in the middle,
the rest of the closing sequence will be skipped. This patch makes the closing
sequence of `OperatorCoordinator` more robust by swallowing the exception
thrown in the middle, and also retries interrupting the threads in case the the
closing sequence is blocked multiple times.
Some of the methods, such as `closeQuietly()`, in the `IOUtils` seem better
to be put in `ComponentClosingUtils`. Will do that in a separate PR.
## Brief change log
0dfe9b7 Add util methods to shutdown executor services.
1cb9f56 Make OperatorCoordinator closure more robust.
## Verifying this change
This change added the following unit tests:
1. `ComponentClosingUtilsTest` class.
2. `SourceCoordinatorTest.testBlockOnClose()` test method.
## 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: (yes)
- 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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