StephanEwen opened a new pull request #13538:
URL: https://github.com/apache/flink/pull/13538
## What is the purpose of the change
This adds the `LocalityAwareSplitAssigner` for the new File Source API. The
new assigner works the exact same way as the `LocatableInputSplitAssigner` from
the *InputFormat API*.
This new split assigner is also the default now for the `FileSource`.
The code of the `LocalityAwareSplitAssigner` is largely a copy of the code
from the `LocatableInputSplitAssigner`, adjusted for the different interface
methods and cleaned up (code style / checkstyle).
## Verifying this change
This copies and adjusts the tests from the `LocatableInputSplitAssigner`,
except for the concurrency-related tests. Those are dropped, because the new
FileSplitAssigners are not concurrent.
## 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)`: **yes, but only unreleased classes**
- 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/Mesos, 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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