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https://issues.apache.org/jira/browse/HIVE-8158?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rajesh Balamohan updated HIVE-8158:
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Attachment: profiler_output.png
> Optimize writeValue/setValue in VectorExpressionWriterFactory (in
> VectorReduceSinkOperator codepath)
> ----------------------------------------------------------------------------------------------------
>
> Key: HIVE-8158
> URL: https://issues.apache.org/jira/browse/HIVE-8158
> Project: Hive
> Issue Type: Bug
> Reporter: Rajesh Balamohan
> Assignee: Rajesh Balamohan
> Labels: performance
> Attachments: profiler_output.png
>
>
> VectorReduceSinkOperator --> ProcessOp --> makeValueWriatable -->
> VectorExpressionWriterFactory --> writeValue(byte[], int, int) /setValue.
> It appears that this goes through an additional layer of Text.encode/decode
> causing CPU pressure (profiler output attached).
> SettableStringObjectInspector / WritableStringObjectInspector has "set(Object
> o, Text value)" method. It would be beneficial to use set(Object, Text)
> directly to save CPU cycles.
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