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https://issues.apache.org/jira/browse/MAPREDUCE-3182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13967012#comment-13967012
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Chen He commented on MAPREDUCE-3182:
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I will take look at this issue.
> loadgen ignores -m command line when writing random data
> --------------------------------------------------------
>
> Key: MAPREDUCE-3182
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3182
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2, test
> Affects Versions: 0.23.0, 0.24.0
> Reporter: Jonathan Eagles
>
> If no input directories are specified, loadgen goes into a special mode where
> random data is generated and written. In that mode, setting the number of
> mappers (-m command line option) is overridden by a calculation. Instead, it
> should take into consideration the user specified number of mappers and fall
> back to the calculation. In addition, update the documentation as well to
> match the new behavior in the code.
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