Mailing-List: contact core-dev-help@hadoop.apache.org; run by ezmlm
Precedence: bulk
Reply-To: core-dev@hadoop.apache.org
Message-ID: <542739708.1223655224451.JavaMail.jira@brutus>
Date: Fri, 10 Oct 2008 09:13:44 -0700 (PDT)
From: "Owen O'Malley (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-4044) Create symbolic links in HDFS
In-Reply-To: <132525105.1219991324428.JavaMail.jira@brutus>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit


    [ https://issues.apache.org/jira/browse/HADOOP-4044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12638581#action_12638581 ] 

Owen O'Malley commented on HADOOP-4044:
---------------------------------------

Ok, I realized after I posted that in fact the LinkResult is not abstract.

Doug> do you think this logic is unique to HDFS?

Well, currently yes, but in the long term hopefully not. In my proposal, most of the work would happen in LinkResult.

Doug> Also, the pseudo code above will cause a stack overflow for a circular link.

I was assuming (and included in the comments) that getNewPath would throw if it was too deeply nested. I would probably use a thread local variable to measure the depth of the traversal. It isn't great, but it would be encapsulated in LinkResult.

> Create symbolic links in HDFS
> -----------------------------
>
>                 Key: HADOOP-4044
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4044
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: dfs
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>         Attachments: symLink1.patch, symLink1.patch, symLink4.patch, symLink5.patch, symLink6.patch, symLink8.patch, symLink9.patch
>
>
> HDFS should support symbolic links. A symbolic link is a special type of file that contains a reference to another file or directory in the form of an absolute or relative path and that affects pathname resolution. Programs which read or write to files named by a symbolic link will behave as if operating directly on the target file. However, archiving utilities can handle symbolic links specially and manipulate them directly.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.