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https://issues.apache.org/jira/browse/HIVE-1158?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12834784#action_12834784
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Namit Jain commented on HIVE-1158:
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+1
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: https://issues.apache.org/jira/browse/HIVE-1158
> 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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