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https://issues.apache.org/jira/browse/HADOOP-3052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12583150#action_12583150
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Allen Wittenauer commented on HADOOP-3052:
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We estimated that it would take over a week with single threaded chown's to set
permissions on one of our bigger clusters.
Using the test distch code, we're seeing timings like 1 hour 9 minutes, 33
seconds for 198382 files using 100 nodes.
> distch -- tool to do parallel ch*
> ----------------------------------
>
> Key: HADOOP-3052
> URL: https://issues.apache.org/jira/browse/HADOOP-3052
> Project: Hadoop Core
> Issue Type: Task
> Components: dfs
> Affects Versions: 0.16.1
> Reporter: Robert Chansler
> Assignee: Tsz Wo (Nicholas), SZE
> Fix For: 0.17.0
>
>
> Build a tool to do parallel ch{mod,grp,own} on files.
> This would have the advantage over the shell -R commands in that name nodes
> syncs from multiple clients are effectively batched.
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