Myasuka opened a new pull request #7586: [FLINK-10912][rocksdb] Configurable RocksDBStateBackend options URL: https://github.com/apache/flink/pull/7586 ## What is the purpose of the change Enable to configure RocksDB's `DBOptions` and `ColumnFamilyOptions` through `flink-conf.yaml`. 1. Introduce option `state.backend.rocksdb.predefined-options`, so that the `PredefinedOptions` could be configured through `flink-conf.yaml`. 1. Introduce a bunch of customized options within `RocksDBCustomizedOptions` to cover current `PredefinedOptions` and support to configure them through `flink-conf.yaml`. 1. Support to configure options programmatically to override options defined through `flink-conf.yaml`. 1. Keep backward compatibility for current solution of `PredefinedOptions` and `OptionsFactory`. Old user code would control RocksDB as before without any impacts from `RocksDBCustomizedOptions` introduced. ## Brief change log - Introduce option `state.backend.rocksdb.predefined-options` within `RocksDBOptions`. - Introduce new class `RocksDBCustomizedOptions` with a bunch of customized options. ## Verifying this change This change added tests and can be verified as follows: - Added test validating that `RocksDBCustomizedOptions` could be well parsed or created. - Added test validating that a RocksDB option would be finally controlled according to the priority of `OptionsFactory` --> `RocksDBCustomizedOptions` --> `PredefinedOptions`. - Added test validating that programmatically configured options could override options defined through `flink-conf.yaml`. ## 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, `RocksDBStateBackend` is not annotated with `@Public` but is visible for users. - 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? yes - If yes, how is the feature documented? docs
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