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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4044) Create symbolic links in HDFS
Date Fri, 26 Sep 2008 18:51:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12634968#action_12634968
] 

Doug Cutting commented on HADOOP-4044:
--------------------------------------

I still much prefer the name 'link' to 'vfs'.  You use the name 'vfs' in support of symbolic
links only, and thus should be named accordingly.  There's no need to invent another name
here.  No one knows what a 'vfs' is, and we don't need to define it or confuse folks with
this notion.  Everyone already knows what a link is.

Can we get away with only a single implementation of the link resolver?  You already create
a bogus FileStatus in the status-based link resolver, so can't we use the same approach to
implement the path-based link resolver in terms of the status-based one, so that we only have
a single implementation of the loop-detection logic, not two?

There are still a few implementations of getSymlink() that don't throw exceptions for non-links.

You still have not explained the necessity of getRemainingPath().


> 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
>
>
> 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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