wsry opened a new pull request #15302:
URL: https://github.com/apache/flink/pull/15302
## What is the purpose of the change
FileChannelManagerImpl#getNextPathNum is not atomic which may cause
unfairness of data directory selection. This patch makes the selection of data
directories fair which is good for load balance and performance especially when
there are multiple disks.
## Brief change log
- Make FileChannelManagerImpl#getNextPathNum select data directories
fairly.
## Verifying this change
This change added tests.
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (yes / **no**)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (yes / **no**)
- The serializers: (yes / **no** / don't know)
- The runtime per-record code paths (performance sensitive): (yes / **no**
/ don't know)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: (yes / **no** /
don't know)
- The S3 file system connector: (yes / **no** / don't know)
## Documentation
- Does this pull request introduce a new feature? (yes / **no**)
- If yes, how is the feature documented? (**not applicable** / docs /
JavaDocs / not documented)
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