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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4044) Create symbolic links in HDFS
Date Fri, 12 Sep 2008 00:51:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12630444#action_12630444
] 

Allen Wittenauer commented on HADOOP-4044:
------------------------------------------

-1 to both, because I think we're rushing this without a significant amount of thought as
to what a multi-filesystem directory structure should look like.

In my mind, cross-filesystem "symlinks" really don't seem like "real" symlinks to me, but
a sort of hacked version of autofs support.  How do you determine if a file is "real" or not?
 How do I "undo" a symlink?  What does this look like from an audit log perspective? Is this
really just a "short cut" to providing the equivalent of mount?

If we ignore what I said above :) , I'm trying to think of a use case where I wouldn't want
to symlink an entire dir.  A single file?  Really?  

I think it is much more interesting to provide a symlink to a directory.  I can have "data/v1.423"
and then have a symlink called LATEST that points to the latest version of a given versioned
data set.

> 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
>
>
> 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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