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https://issues.apache.org/jira/browse/FLINK-9702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16681078#comment-16681078
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Stefan Richter commented on FLINK-9702:
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I think it still makes sense, please consider the link in my previous comment.
I had already a almost complete implementation that just needs some rebasing I
guess, no need to start from scratch.
> 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
> Assignee: Congxian Qiu
> Priority: Major
>
> 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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