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https://issues.apache.org/jira/browse/MAPREDUCE-6220?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14492012#comment-14492012
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Yang Hao commented on MAPREDUCE-6220:
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It has been convinced that it doesn't affect the log aggregation
> Provide option to suppress stdout of MapReduce task
> ---------------------------------------------------
>
> Key: MAPREDUCE-6220
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6220
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: mrv2
> Reporter: Yang Hao
> Assignee: Yang Hao
> Attachments: MAPREDUCE-6220.patch, MAPREDUCE-6220.v2.patch
>
>
> System.out is a ugly way to print log, and many times it would do harm to
> Hadoop cluster. So we can provide an option to forbid it
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