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https://issues.apache.org/jira/browse/HIVE-23745?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mustafa Iman reassigned HIVE-23745:
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> Avoid copying userpayload in task communicator
> ----------------------------------------------
>
> Key: HIVE-23745
> URL: https://issues.apache.org/jira/browse/HIVE-23745
> Project: Hive
> Issue Type: Sub-task
> Reporter: Mustafa Iman
> Assignee: Mustafa Iman
> Priority: Major
>
> [https://github.com/apache/hive/blob/master/llap-common/src/java/org/apache/hadoop/hive/llap/tez/Converters.java#L182]
> I see this copy take a few milliseconds sometimes. Delay here adds up for
> all tasks of a single vertex in LlapTaskCommunicator as it processes tasks
> one by one. User payload never changes in this codepath. Copy is made because
> of limitations of Protobuf library. Protobuf adds a UnsafeByteOperations
> class that avoid copying of ByteBuffers in 3.1 version. This can be resolved
> when Protobuf is upgraded.
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