Zakelly opened a new pull request, #26968:
URL: https://github.com/apache/flink/pull/26968
## What is the purpose of the change
Currently, the file-merging manager’s recovery logic uses the Operator ID to
parse the destination directory, whereas the manager initialization uses the
Job Vertex ID. This mismatch can lead to a NPE. This may happen for the
recovery of operators which are not at the head of operator chain. Typically
this kind of operator has no state to recovery in SQL jobs, but it's possible
for Datastream jobs.
This PR fixes it by using Job Vertex ID everywhere.
## Brief change log
- Use JobVertexID in Subtaskkey of file-merging.
## Verifying this change
This change modifies the existing tests `FileMergingSnapshotManagerTestBase`
to cover this case.
## 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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