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https://issues.apache.org/jira/browse/HIVE-3086?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13428864#comment-13428864
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Namit Jain commented on HIVE-3086:
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@Alex, The problem that you mentioned can be handled by
https://issues.apache.org/jira/browse/HIVE-3286.
Navis is working on that. These are independent strategies and can be applied.
> Skewed Join Optimization
> ------------------------
>
> Key: HIVE-3086
> URL: https://issues.apache.org/jira/browse/HIVE-3086
> Project: Hive
> Issue Type: New Feature
> Reporter: Nadeem Moidu
> Assignee: Nadeem Moidu
>
> During a join operation, if one of the columns has a skewed key, it can cause
> that particular reducer to become the bottleneck. The following feature will
> address it:
> https://cwiki.apache.org/confluence/display/Hive/Skewed+Join+Optimization
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