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Posted to dev@hive.apache.org by "Namit Jain (JIRA)" <ji...@apache.org> on 2009/03/09 23:11:50 UTC
[jira] Updated: (HIVE-291) [Hive] map-side aggregation should be
automatically disabled at run-time if it is not turning out to be useful
[ https://issues.apache.org/jira/browse/HIVE-291?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Namit Jain updated HIVE-291:
----------------------------
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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