[jira] Updated: (HADOOP-4368) Superuser privileges required to do "df"

["Robert Chansler (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-4368?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Chansler updated HADOOP-4368:
------------------------------------

    Release Note: New filesystem shell command -df reports capacity, space used and space free. Any user may execute this command without special privileges.  (was: Adds API support for unprivileged users to see filesystem statistics (capacity, used, free). Adds a -df option to fs shell utility that allows unprivileged users to see filesystem statistics. Changes libhdfs and namenode jsps to use new filesystem statistics API.)

Editorial pass over all release notes prior to publication of 0.21.

> Superuser privileges required to do "df"
> ----------------------------------------
>
>                 Key: HADOOP-4368
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4368
>             Project: Hadoop Common
>          Issue Type: New Feature
>    Affects Versions: 0.18.1
>            Reporter: Brian Bockelman
>            Assignee: Craig Macdonald
>            Priority: Minor
>             Fix For: 0.21.0
>
>         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, hadoop4368.fsstatus.v6.patch, hadoop4368.fsstatus.v7.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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