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From "Craig Macdonald (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4368) Superuser privileges required to do "df"
Date Wed, 28 Jan 2009 10:09:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12667982#action_12667982
] 

Craig Macdonald commented on HADOOP-4368:
-----------------------------------------

@Nicholas: It appears that getCapacityTotal(), getCapacityUsed(), getCapacityRemaining are
all exported in the FSNamesystemMBean interface. This is no longer in the public javadoc,
but still exists.

> 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: dfs, libhdfs
>    Affects Versions: 0.18.1
>            Reporter: Brian Bockelman
>            Assignee: Craig Macdonald
>            Priority: Minor
>         Attachments: fuse_statfs.patch, fuse_statfs_trunk.patch, hadoop4368.fsstatus.patch,
hadoop4368.fsstatus.v2.patch, hadoop4368.fsstatus.v3.patch, hadoop4368.fsstatus.v4.patch,
hadoop4368.fsstatus.v5.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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