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[jira] [Created] (FLINK-9702) Improvement in (de)serialization of keys and values for RocksDB state

Stefan Richter created FLINK-9702:

             Summary: Improvement in (de)serialization of keys and values for RocksDB state
                 Key: FLINK-9702
                 URL: https://issues.apache.org/jira/browse/FLINK-9702
             Project: Flink
          Issue Type: Improvement
          Components: State Backends, Checkpointing
    Affects Versions: 1.6.0
            Reporter: Stefan Richter

When Flink interacts with state in RocksDB, object (de)serialization often contributes significantly to performance overhead. I think there are some aspects that we can improve here to reduce the costs in this area. In particular, currently every state has to serialize the backen's current key before each state access. We could reduce this effort by sharing serialized key bytes across all state interactions. Furthermore, we can reduce the amount of  `byte[]` and stream/view that are involved.

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