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From "Namit Jain (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HIVE-291) [Hive] map-side aggregation should be automatically disabled at run-time if it is not turning out to be useful
Date Mon, 16 Feb 2009 01:32:59 GMT

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

Namit Jain updated HIVE-291:
----------------------------

    Status: Patch Available  (was: Open)

have not run the patch on the main cluster yet - dont want to bring the cluster down in case
of a bug on a long weekend.
will merge only after testing with large data

> [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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