rkhachatryan opened a new pull request #14953:
URL: https://github.com/apache/flink/pull/14953
## What is the purpose of the change
```
When a savepoint is added to CompletedCheckpointStore
all previous checkpoints will be removed if number to
retain is 1.
This makes future incremental checkpoints invalid since
they can refer to the discarded state.
```
## Verifying this change
Added unit tests for the `DefaultCompletedCheckpointStore`
(`testAtLeastOneCheckpointRetained`, `testOlderSavepointSubsumed`,
`testSubsumeAfterStoppingWithSavepoint`, `testNotSubsumedIfNotNeeded`).
I test `DefaultCompletedCheckpointStore` and not the
`CheckpointSubsumeHelper` to verify their integration.
## 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? no
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