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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4044) Create symbolic links in HDFS
Date Fri, 10 Oct 2008 16:13:44 GMT

    [ 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.

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