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Date: Thu, 4 Dec 2008 09:50:44 -0800 (PST)
From: "Konstantin Shvachko (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-4368) Superuser privileges required to do
 "df"
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    [ https://issues.apache.org/jira/browse/HADOOP-4368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12653382#action_12653382 ] 

Konstantin Shvachko commented on HADOOP-4368:
---------------------------------------------

I am confused. Does that mean that anybody will be able to connect to HDFS as a superuser via fuse?
It seamed like a rather simple move of a command from one class to another. Why would you want to cut corners like that?

> 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
>         Attachments: fuse_statfs.patch, fuse_statfs_trunk.patch
>
>   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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