dawidwys opened a new pull request #13550:
URL: https://github.com/apache/flink/pull/13550
## What is the purpose of the change
This commit introduces a SingleKeyStateBackend. This state backend is a
simplified version of a state backend that can be used in a BATCH
runtime mode. It requires the input to be sorted, as it only ever
remembers the current key. If the key changes, the current state is
discarded. Moreover this state backend does not support checkpointing.
## Verifying this change
This change added tests:
*
org.apache.flink.streaming.api.operators.sorted.state.SingleKeyStateBackendVerificationTest
*
org.apache.flink.streaming.api.operators.sorted.state.SingleKeyStateBackendTest
*
org.apache.flink.streaming.api.operators.sorted.state.SingleKeyKeyGroupedInternalPriorityQueueTest
## 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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