[jira] Updated: (HIVE-170) map-side aggregations does not work properly

["Namit Jain (JIRA)" <ji...@apache.org>]

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

Namit Jain updated HIVE-170:
----------------------------

    Status: Patch Available  (was: Open)

> 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
>
>
> 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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