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From "Craig Macdonald (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-4368) Superuser privileges required to do "df"
Date Mon, 05 Jan 2009 12:37:45 GMT

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

Craig Macdonald updated HADOOP-4368:
------------------------------------

    Attachment: hadoop4368.fsstatus.patch

This patch in effect corrects the Java API:
 * adds FsStatus in FileSystem, and made DFSClient use this
 * DiskStatus in DistributedFileSystem is deprecate, but extends FsStatus.
 * FSNamesystem#getStats() no longer requires super user privelege - all it does is return
the values of three variables, so does not add considerable load to the name node.
 * As suggested by Doug, the default FileSystem implementation returns Long.MAX_VALUE for
free and capacity, and 0 for used. This could be fixed for LocalFileSystem using the java.io.File
api, however, it depends on which partition of the local filesystem that you want to query.
   ** In this case, perhaps getStats(Path p) would be more appropriate? DistributedFileSystem
would ignore the Path parameter

> 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, hadoop4368.fsstatus.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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