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From "Craig Macdonald (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-4368) Superuser privileges required to do "df"
Date Fri, 23 Jan 2009 19:15:59 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.v3.patch

Updated patch attached, addressing Nicholas' and Doug's comments.

@Nicholas: I have added a -df command to FsShell, which has similar output to GNUs core-utils
df command. I left the DFSAdmin output, as I thought this was (a) useful, and (b) gives more
interpretations on the reported figures for the HDFS scenario than FsShell#df() should.

NB: The java.io.File getTotalSpace() etc API works find for normally mounted local and NFS
partitions on linux, but for partitions that are mounted by autofs, I found it always gave
0s. This seems to be a problem with these API methods that are new in Java 6. I couldn't find
reference to such a problem anywhere on the web. 

Two questions: 
1. Should I provide ant-patch output myself?
2. Should I fix libhdfs in this issue as well?

> 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
>            Assignee: Craig Macdonald
>            Priority: Minor
>         Attachments: fuse_statfs.patch, fuse_statfs_trunk.patch, hadoop4368.fsstatus.patch,
hadoop4368.fsstatus.v2.patch, hadoop4368.fsstatus.v3.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
> 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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