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https://issues.apache.org/jira/browse/HADOOP-3973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12623957#action_12623957
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Amir Youssefi commented on HADOOP-3973:
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Changing Signature of Reporter methods may not have any backward compatibility
issues. Adding extra attribute, setter... or using current setStatus() with a
pre-defined String will do.
I think exception method is cleaner because flag (a Config Setting) is not
necessary to remedy performance issue.
We are still discussing Map . Regarding Map and HADOOP-3700 , user can simply
skip calling collect and there doesn't seem to be a need for an exception.
> 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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