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https://issues.apache.org/jira/browse/MAPREDUCE-940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12749481#action_12749481
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Ravi Gummadi commented on MAPREDUCE-940:
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Amar is planning to change distcp also as part of MAPREDUCE-181
> Distcp should not use mapred.system.dir
> ---------------------------------------
>
> Key: MAPREDUCE-940
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-940
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: distcp
> Reporter: Ravi Gummadi
>
> Distcp uses mapred.system.dir to create files like _distcp_src_files,
> _distcp_dst_files, etc. Since MAPREDUCE-181 is removing exposing of
> mapred.stystem.dir, distcp needs to use something like homeDir/.staging/
> instead of mapred.system.dir. Please see the patch of MAPREDUCE-181 for more
> details.
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