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Posted to dev@hive.apache.org by "Namit Jain (JIRA)" <ji...@apache.org> on 2009/02/16 02:30:59 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:
----------------------------

    Attachment: 291.1.txt

> [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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