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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4368) Superuser privileges required to do "df"
Date Mon, 27 Oct 2008 18:08:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12642987#action_12642987
] 

Allen Wittenauer commented on HADOOP-4368:
------------------------------------------

I argue that anything that doesn't require super user shouldn't be under dfsadmin to make
the distinction clear.

One thing that has me concerned... what sort of load on the name node does generating the
data for -report generate?  If it is significant, then it should remained privileged.



> Superuser privileges required to do "df"
> ----------------------------------------
>
>                 Key: HADOOP-4368
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4368
>             Project: Hadoop Core
>          Issue Type: Wish
>          Components: contrib/fuse-dfs, dfs
>    Affects Versions: 0.18.1
>            Reporter: Brian Bockelman
>            Priority: Minor
>   Original Estimate: 0.17h
>  Remaining Estimate: 0.17h
>
> super user privileges are required in DFS in order to get the file system statistics
(FSNamesystem.java, getStats method).  This means that when HDFS is mounted via fuse-dfs as
a non-root user, "df" is going to return 16exabytes total and 0 free instead of the correct
amount.
> As far as I can tell, there's no need to require super user privileges to see the file
system size (and historically in Unix, this is not required).
> To fix this, simply comment out the privilege check in the getStats method.

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