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https://issues.apache.org/jira/browse/HADOOP-1346?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12495114
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Owen O'Malley commented on HADOOP-1346:
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The in memory sort is a negligible portion of the time. Allowing choices will
increase the complexity of the system while providing very little benefit.
> Provide alternatives to merge sort while sorting map output values in memory
> ----------------------------------------------------------------------------
>
> Key: HADOOP-1346
> URL: https://issues.apache.org/jira/browse/HADOOP-1346
> Project: Hadoop
> Issue Type: Improvement
> Components: mapred
> Affects Versions: 0.12.3
> Reporter: Gautam Kowshik
> Assigned To: Gautam Kowshik
>
> Currently we have only do a merge sort while sorting map output. We can have
> alternatives to this for the user to choose from, in particular, QuickSort
> could provide a good improvement.
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