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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4044) Create symbolic links in HDFS
Date Tue, 14 Oct 2008 22:01:46 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12639609#action_12639609
] 

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

>(I guess unix thinks the : is simply part of the name.)
 
Pretty much. ln doesn't validate the link at all, so you can put all sorts of interesting
things there.  It is up to the calling program or filesystem to verify the validity in its
context.  [For example, I think it is rsh that if you link a hostname to rsh, it will then
rsh to that host.]

It should also be noted that : is a valid directory separator under HFS+ (Mac OS X) as well.
 You're likely to see very bizarro results on those operating systems that use : as a metachar
as a result.

> 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: HADOOP-4044-strawman.patch, 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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