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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3052) distch -- tool to do parallel ch*
Date Fri, 28 Mar 2008 18:32:24 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12583130#action_12583130
] 

Doug Cutting commented on HADOOP-3052:
--------------------------------------

My concern is two-part: (1) is this really something that we need to optimize?  Is single-threaded
'chmod -R' so slow that applications are spending significant amount of their time in it?
 And, (2) is it perhaps a feature that someone who runs 'chmod -R' isn't able to overwhelm
the namenode.  The namenode is often shared between multiple mapreduce clusters (e.g. under
HOD) but a single mapreduce cluster running a distributed 'chmod -R' could overwhelm the namenode
and prevent other applications from making progress.

> 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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