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Doug Cutting commented on HADOOP-4368:
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>I suspect that it was checked in when permissions were added to the FSNamesystem.
Did you verify this? 'svn blame' tells all.
http://tinyurl.com/42uf5d
which leads to HADOOP-2659, indicating the folks you might direct your question towards.
core-dev might be the more appropriate list at this point.
> 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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