zhuzhurk opened a new pull request #12423:
URL: https://github.com/apache/flink/pull/12423
## What is the purpose of the change
Preferred locations based on state and inputs are scattered into multiple
components, which makes it harder to reasoning the calculation and complicates
those hosting components.
This PR is to introduce a PreferredLocationsRetriever to be used by
ExecutionSlotAllocator which returns preferred locations of an execution vertex
and hides the details of the calculation from other components.
This PR is based on #12256.
## Brief change log
- *Introduced PreferredLocationsRetriever*
- *Change ExecutionSlotAllocator to use PreferredLocationsRetriever*
## Verifying this change
This change is already covered by existing 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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