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