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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8040) Add symlink support to FileSystem
Date Fri, 06 Sep 2013 20:11:56 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13760573#comment-13760573
] 

Andrew Wang commented on HADOOP-8040:
-------------------------------------

IIUC, Arun wants to make 2.2.0 off of branch-2.1, not branch-2, so right now this isn't slated
for GA.

I agree with Eli though that it would be really unfortunate if symlink support wasn't in GA,
since it means punting it out until the next compat-breaking release. We need to do a lot
of testing though, and resolve semantics issues like HADOOP-9912.
                
> 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
>             Fix For: 3.0.0, 2.3.0
>
>         Attachments: hadoop-8040-1.patch, hadoop-8040-2.patch, hadoop-8040-3.patch, hadoop-8040-4.patch,
hadoop-8040-5.patch, hadoop-8040-6.patch, hadoop-8040-7.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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