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https://issues.apache.org/jira/browse/PIG-3365?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13697135#comment-13697135
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Rohini Palaniswamy commented on PIG-3365:
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We should automatically set this property for jobs that have 1 input split. We
should also have a way to turn off pig doing that as uber jobs are not that
quite stable yet and might hit issues with hadoop.
> Run as uber job if there is only one input split
> ------------------------------------------------
>
> Key: PIG-3365
> URL: https://issues.apache.org/jira/browse/PIG-3365
> Project: Pig
> Issue Type: Improvement
> Reporter: Rohini Palaniswamy
> Labels: Performance
>
> Hadoop 2 has support for uber mode (mapreduce.job.ubertask.enable=true) which
> runs the map and reduce on Application Master itself and reduces the overhead
> of launching a separate map/reduce task.
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