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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4044) Create symbolic links in HDFS
Date Sat, 11 Oct 2008 03:15:45 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12638707#action_12638707
] 

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

> I see you are changing the subject.

I am saddened that you think that.  I have tried to say the same thing in many different ways,
to make myself better understood.  I will say it one last time: I will veto any patch that
uses exceptions to to communicate links within the FileSystem implentation.  Exceptions are
an inappropriate mechanism for communicating normal, expected values.  In the namesystem sub-component
of HDFS, which stores links, and any other sub-components between that and the generic FileSystem
API, links are normal, expected events, even links to different FileSystems.  There.  I've
said it again.  I am now done saying it.  Do not expect me to respond again about the issue
of using exceptions to communicate the presence of links in HDFS.  My answer will not change.
 Let's move on.

> 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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