StephanEwen opened a new pull request #14255:
URL: https://github.com/apache/flink/pull/14255
## What is the purpose of the change
Previously, the `CheckpointCoordinator` returned in all *restore...()*
methods a boolean: true if a checkpoint was actually restored, false if none
was found.
This PR changes the `restoreLatestCheckpointedStateToSubtasks()` method to
return an `OptionalLong` with the checkpoint ID of the returned checkpoint, or
an empty optional, if no checkpoint was found.
This exposes a bit more information to outside components, without
introducing more coupling.
## Verifying this change
This change is a trivial rework / code cleanup without any test coverage.
## 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/Mesos, 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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