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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8040) Add symlink support to FileSystem
Date Wed, 20 Mar 2013 14:01:17 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13607621#comment-13607621
] 

Daryn Sharp commented on HADOOP-8040:
-------------------------------------

I've only done a cursory scan of the patch, but does this work correctly with {{ViewFileSystem}}
and {{ChrootedFileSystem}}?  Ie. will a relative or absolute symlink path be resolved relative
to the underlying filesystem (incorrect), or to the mount table/chroot (correct)?  Also, does
this support relative symlinks?  It doesn't look like it does?
                
> Add symlink support to FileSystem
> ---------------------------------
>
>                 Key: HADOOP-8040
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8040
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: fs
>    Affects Versions: 0.23.0, 3.0.0, 2.0.3-alpha
>            Reporter: Eli Collins
>            Assignee: Andrew Wang
>         Attachments: hadoop-8040-1.patch, hadoop-8040-2.patch
>
>
> HADOOP-6421 added symbolic links to FileContext. Resolving symlinks is done on the client-side,
and therefore requires client support. An HDFS symlink (created by FileContext) when accessed
by FileSystem will result in an unhandled UnresolvedLinkException. Because not all users will
migrate from FileSystem to FileContext in lock step, and we want users of FileSystem to be
able to access all paths created by FileContext, we need to support symlink resolution in
FileSystem as well, to facilitate migration to FileContext.

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