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https://issues.apache.org/jira/browse/FLINK-9702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16714627#comment-16714627
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ASF GitHub Bot commented on FLINK-9702:
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StefanRRichter commented on issue #7210: [FLINK-9702][State Backends,
Checkpointing] Improvement in (de)serialization of keys and values for RocksDB
state
URL: https://github.com/apache/flink/pull/7210#issuecomment-445791764
Thanks for your help in finishing this issue! If you don't mind, I will add
some more commits from my original branch
https://github.com/StefanRRichter/flink/commits/serialiation-improvements that
are not included here and then finalize and merge this.
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> 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
> Labels: pull-request-available
>
> 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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