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https://issues.apache.org/jira/browse/HIVE-14160?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Mollitor resolved HIVE-14160.
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Resolution: Won't Fix
Closing as Hive 1.1 is long since deprecated.
> Reduce-task costs a long time to finish on the condition that the certain sql
> "select a,distinct(b) group by a" has been executed on the data which has
> skew distribution
> -------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HIVE-14160
> URL: https://issues.apache.org/jira/browse/HIVE-14160
> Project: Hive
> Issue Type: Improvement
> Affects Versions: 1.1.0
> Reporter: marymwu
> Priority: Major
> Labels: pull-request-available
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Reduce-task costs a long time to finish on the condition that the certain sql
> "select a,distinct(b) group by a" has been executed on the data which has
> skew distribution
> data scale: 64G
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