StefanRRichter opened a new pull request #7288: [FLINK-9702] Improvement in (de)serialization of keys and values for RocksDB state URL: https://github.com/apache/flink/pull/7288 ## What is the purpose of the change When Flink interacts with state in RocksDB, object (de)serialization often contributes significantly to performance overhead. In particular, currently every state has to serialize the backen's current key before each state access. This PR wants to reduce this effort by sharing serialized key bytes across all state interactions. ## Verifying this change This change is already covered by existing tests. Additional unit tests for `RocksDBSerializedCompositeKeyBuilder`. ## 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, 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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