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From "Brian Bockelman (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4368) Superuser privileges required to do "df"
Date Fri, 17 Oct 2008 19:17:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12640634#action_12640634
] 

Brian Bockelman commented on HADOOP-4368:
-----------------------------------------

Hey Konstantin, Nicholas,

The DFSAdmin -report command gives you a lot more information than what getStats does.  getStats
only returns the value of capacity/free/used; these are kept in internal counters, and not
recomputed when the function is executed.  Traditionally, knowing how large the file system
is is not a protected operation in Unix.

I guess it would make sense to include the getStats command in the FSShell command group.

> 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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