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https://issues.apache.org/jira/browse/HIVE-562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12768758#action_12768758
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Jeff Hammerbacher commented on HIVE-562:
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It may be worth looking into how Pig solved this problem; see
http://wiki.apache.org/pig/PigSkewedJoinSpec for their design.
> join does not work well if there is a very large skew in keys
> -------------------------------------------------------------
>
> Key: HIVE-562
> URL: https://issues.apache.org/jira/browse/HIVE-562
> Project: Hadoop Hive
> Issue Type: Improvement
> Components: Query Processor
> Affects Versions: 0.4.0
> Reporter: Namit Jain
>
> Only the last table is streamed in case of regular joins.
> So, for any other table, or for any small table (in case of map-joins), if
> the number of values for a given key are very large, it does not scale.
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