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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9761) ViewFileSystem#rename fails when using DistributedFileSystem
Date Thu, 01 Aug 2013 23:51:48 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13727103#comment-13727103
] 

Andrew Wang commented on HADOOP-9761:
-------------------------------------

I had that thought, it's a tradeoff between clarity and duplicating the exception. I was hoping
that having a comment would alleviate the clarity concern, but I can re-rev if you want.

It's also perhaps worth noting that duplication is across sub-projects, i.e. {{FileSystem#checkPath}}
is in Common while DFS is in HDFS.
                
> ViewFileSystem#rename fails when using DistributedFileSystem
> ------------------------------------------------------------
>
>                 Key: HADOOP-9761
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9761
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: viewfs
>    Affects Versions: 3.0.0, 2.1.0-beta
>            Reporter: Andrew Wang
>            Assignee: Andrew Wang
>         Attachments: 0001-HADOOP-9761.004.patch, hadoop-9761-1.patch, hadoop-9761-1.patch,
hadoop-9761-2.patch
>
>
> ViewFileSystem currently passes unqualified paths (no scheme or authority) to underlying
FileSystems when doing a rename. DistributedFileSystem symlink support added in HADOOP-9418
needs to qualify and check rename sources and destinations since cross-filesystem renames
aren't supported, so this breaks in the following way
> - Default FS URI is configured to viewfs://<viewfs>
> - When doing a rename, ViewFileSystem checks to make sure both src and dst FileSystems
are the same (which they are, both in same DFS), and then calls DistributedFileSystem#rename
with unqualified "remainder" paths
> - Since these paths are unqualified, DFS qualifies them with the default FS to check
that it can do the rename. This turns it into viewfs://<viewfs>/<path>
> - Since viewfs://<viewfs> is not the DFS's URI, DFS errors out the rename.

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