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From "Zheng Shao (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HIVE-170) map-side aggregations does not work properly
Date Wed, 17 Dec 2008 22:48:44 GMT

     [ https://issues.apache.org/jira/browse/HIVE-170?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Zheng Shao updated HIVE-170:

      Resolution: Fixed
    Hadoop Flags: [Reviewed]
          Status: Resolved  (was: Patch Available)

HIVE-170. Map-side aggregations to estimate memory size. (Namit via zshao)

> map-side aggregations does not work properly
> --------------------------------------------
>                 Key: HIVE-170
>                 URL: https://issues.apache.org/jira/browse/HIVE-170
>             Project: Hadoop Hive
>          Issue Type: Bug
>          Components: Query Processor
>            Reporter: Namit Jain
>            Assignee: Namit Jain
>         Attachments: 170.patch, patch.170.3, patch.2, patch2
> map-side aggregation depends on runtime.freememory() which is not guaranteed to return
the freeable memory - it depends on when the garbage collector is invoked last.
> It might be a good idea to estimate the number of rows that can fit in the hash table
and then flush the hash table based on that

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