Zakelly opened a new pull request, #26279:
URL: https://github.com/apache/flink/pull/26279
## What is the purpose of the change
ForSt may create LOG files twice with overwrite, however, the ForSt wrapped
file system does not support overwriting files. Exception thrown in this case.
This PR fixes the bug above, as well as some file ownership problem that may
cause a ForSt coredump.
## Brief change log
Please check each commit for code changes:
- Support file override in wrapped file system, modified the
`FileMappingManager`
- Unguarded file system to enable stream sharing between threads
- Avoid the deletion of primary directory in ForSt
## Verifying this change
Multiple UTs added.
## 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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