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https://issues.apache.org/jira/browse/HADOOP-3052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12583110#action_12583110
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Tsz Wo (Nicholas), SZE commented on HADOOP-3052:
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> Wouldn't this be a DDOS attach on the namenode?
I have written a distch map/reduce program for testing. You are right that it
makes the NameNode very busy when the number of files/dirs are huge. The
question is: how should we prevent DDOS? Any user could simply write a program
to launch a huge number of accesses.
> 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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