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https://issues.apache.org/jira/browse/HIVE-1093?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12804395#action_12804395
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Namit Jain commented on HIVE-1093:
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Do you have performance numbers for the testcase ? I mean, small map size will
lead to more mappers each of which is reading the
other tables.
> Add a "skew join map join size" variable to control the input size of skew
> join's following map join job.
> ---------------------------------------------------------------------------------------------------------
>
> Key: HIVE-1093
> URL: https://issues.apache.org/jira/browse/HIVE-1093
> Project: Hadoop Hive
> Issue Type: Improvement
> Reporter: He Yongqiang
> Assignee: He Yongqiang
>
> In a test, many skew join key itself >250M size. And the following mapjoin
> will take several hours to do a mapjoin for those big skew keys.
> This can be better by using a small map input size for the following map join
> job.
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