SinBex opened a new pull request, #24887:
URL: https://github.com/apache/flink/pull/24887
## What is the purpose of the change
If the source task does not get assigned a split because the SplitEnumerator
has no more splits, and a failover occurs during the closing process, the
SourceCoordinatorContext will not resend the NoMoreSplit event to the newly
started source task, causing the source vertex to remain stuck indefinitely.
This case may only occur in batch jobs where speculative execution has been
enabled.
## Brief change log
- fix the issue that the source task may get stuck in speculative
execution mode.
## Verifying this change
This change added tests and can be verified as follows:
- *Added it case to verify the issue.*
## 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)
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