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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-9702) Improvement in (de)serialization of keys and values for RocksDB state
Date Sun, 02 Dec 2018 07:13:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-9702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16706122#comment-16706122
] 

ASF GitHub Bot commented on FLINK-9702:
---------------------------------------

klion26 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-443486915
 
 
   cc @StefanRRichter 

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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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