sjwiesman opened a new pull request #13179:
URL: https://github.com/apache/flink/pull/13179
## What is the purpose of the change
Support full table scan of keys and namespaces from the state backend. All
operations assume the calling code already knows what namespace they are
interested in interacting with.
This is a prerequisite to support reading window operators with the state
processor api because window panes are stored as additional namespace
components.
## Brief change log
- Add method `<N> Stream<Tuple2<K, N>> getKeysAndNamespaces(String state)`
to KeyedStateBackend and implementation for all state backends.
## Verifying this change
Added a new test to StateBackendTestBase along with some RocksDB specific
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) Sort of, it touches the statebackends but not any existing code.
- 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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