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https://issues.apache.org/jira/browse/HIVE-291?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Namit Jain updated HIVE-291:
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Status: Open (was: Patch Available)
> [Hive] map-side aggregation should be automatically disabled at run-time if
> it is not turning out to be useful
> --------------------------------------------------------------------------------------------------------------
>
> Key: HIVE-291
> URL: https://issues.apache.org/jira/browse/HIVE-291
> Project: Hadoop Hive
> Issue Type: Bug
> Components: Query Processor
> Reporter: Namit Jain
> Assignee: Namit Jain
> Attachments: 291.1.txt
>
>
> Map-side aggregation should be automatically disabled at run-time if it is
> not turning out to be useful.
> If map-side aggregation is not reducing the number of output rows, it is a
> drain on the mapper, since it is consuming memory and performing unnecessary
> hash lookups
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