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https://issues.apache.org/jira/browse/HADOOP-3973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12623946#action_12623946
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Sharad Agarwal commented on HADOOP-3973:
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Alternate way would be to throw a specific UserException from inside the
mapper/reducer. See HADOOP-3700. The framework can catch it and simply break
the mapper/reducer input loop.
This would avoid changing the Reporter interface (backward compatibility). Also
should be efficient and cleaner IMO.
> Breaking out of a task
> ----------------------
>
> Key: HADOOP-3973
> URL: https://issues.apache.org/jira/browse/HADOOP-3973
> Project: Hadoop Core
> Issue Type: New Feature
> 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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