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https://issues.apache.org/jira/browse/HADOOP-3973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12626166#action_12626166
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Owen O'Malley commented on HADOOP-3973:
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And in the context object api, you can do it in either map or reduce.
See:
http://svn.apache.org/repos/asf/hadoop/core/trunk/src/mapred/org/apache/hadoop/mapreduce/
> Breaking out of a task
> ----------------------
>
> Key: HADOOP-3973
> URL: https://issues.apache.org/jira/browse/HADOOP-3973
> Project: Hadoop Core
> Issue Type: New Feature
> Components: mapred
> Reporter: Amir Youssefi
>
> Occasionally a mapper/reducer is done without need to see more input data. If
> we provide a way to break out and skip reading the rest of input then job
> finishs earlier and resources are spared.
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