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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4044) Create symbolic links in HDFS
Date Fri, 05 Sep 2008 18:24:45 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12628691#action_12628691
] 

dhruba borthakur commented on HADOOP-4044:
------------------------------------------

After a discussion with Joydeep, we came up with the idea that that FileSystem.open() will
transparently resolve a symbolic link if the symbolic  link is a relative or if it is of the
form hdfs://bar/foo.txt. This means that a HDFS symbolic link can point only to other hdfs
pathnames.

In future, if the symbolic link is of the form file://dir/foo.txt, then the FileSystem API
can return it to higher layers for interpretation. This will allow an HDFS symbolic link to
refer to a pathname that is not a HDFS pathname. I do not plan to implement this feature in
the short term. 

> 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
>
> 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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