carp84 opened a new pull request #7899: [FLINK-11731] [State Backends] Make DefaultOperatorStateBackend follow the builder pattern URL: https://github.com/apache/flink/pull/7899 ## What is the purpose of the change This PR makes `DefaultOperatorStateBackend` construction follow the builder pattern. ## Brief change log This PR introduces a builder for `DefaultOperatorStateBackend` and moves all necessary initialization work including restore operation to its building process. It also removes invocation of `DefaultOperatorStateBackend.restore`. ## Verifying this change This change is already covered by existing tests, such as `OperatorStateBackendTest` and `BackendRestorerProcedureTest`, and verified locally. ## 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)`: (**yes**) * It changes the `StateBackend.createOperatorStateBackend` interface, adding two parameters for state handles and `CloseableRegistry` which will be used in restore operation during backend building - The serializers: (no) - The runtime per-record code paths (performance sensitive): (no) - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (no) - 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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