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https://issues.apache.org/jira/browse/HADOOP-1575?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12511037
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Devaraj Das commented on HADOOP-1575:
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Think this is a duplicate of HADOOP-939. Please have a look at that.
> Sort map outputs only if they are not emitted in sorted order
> -------------------------------------------------------------
>
> Key: HADOOP-1575
> URL: https://issues.apache.org/jira/browse/HADOOP-1575
> Project: Hadoop
> Issue Type: Improvement
> Reporter: Christian Kunz
>
> Infrastructure could auto-detect when keys are submitted in sorted order and
> skip sorting in this case.
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