1996fanrui opened a new pull request, #21420:
URL: https://github.com/apache/flink/pull/21420
## What is the purpose of the change
Fix the problem that FlameGraph cannot be generated due to using
ImmutableSet incorrectly
## Brief change log
- The first commit : LOG the exception while generating the flame graph and
refactor some code (It's useful to trouble-shooting int the future)
- The second commit: Remove the ImmutableSet
## Verifying this change
This change added tests and can be verified as follows:
- *JobVertexThreadInfoTrackerTest#testGroupExecutionsByLocation*
## 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 documented
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