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From "Namit Jain (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HIVE-291) [Hive] map-side aggregation should be automatically disabled at run-time if it is not turning out to be useful
Date Mon, 09 Mar 2009 22:13:50 GMT

     [ https://issues.apache.org/jira/browse/HIVE-291?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Namit Jain resolved HIVE-291.
-----------------------------

    Resolution: Duplicate

duplicate of 223

> [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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