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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3052) distch -- tool to do parallel ch*
Date Fri, 28 Mar 2008 17:58:25 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12583110#action_12583110
] 

Tsz Wo (Nicholas), SZE commented on HADOOP-3052:
------------------------------------------------

> 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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