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From "Namit Jain (JIRA)" <>
Subject [jira] Commented: (HIVE-1158) Introducing a new parameter for Map-side join bucket size
Date Wed, 17 Feb 2010 14:47:28 GMT


Namit Jain commented on HIVE-1158:


0.5 patch looks good - will commit if the tests pass

> Introducing a new parameter for Map-side join bucket size
> ---------------------------------------------------------
>                 Key: HIVE-1158
>                 URL:
>             Project: Hadoop Hive
>          Issue Type: Improvement
>    Affects Versions: 0.5.0, 0.6.0
>            Reporter: Ning Zhang
>            Assignee: Ning Zhang
>         Attachments: HIVE-1158.patch, HIVE-1158_branch_0_5.patch
> Map-side join cache the small table in memory and join with the split of the large table
at the mapper side. If the small table is too large, it uses RowContainer to cache a number
of rows indicated by parameter hive.join.cache.size, whose default value is 25000. This parameter
is also used for regular reducer-side joins to cache all input tables except the streaming
table. This default value is too large for map-side join bucket size, resulting in OOM exceptions
sometimes. We should define a different parameter to separate these two cache sizes. 

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