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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4044) Create symbolic links in HDFS
Date Mon, 15 Sep 2008 17:05:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12631071#action_12631071

dhruba borthakur commented on HADOOP-4044:

+1 to Sanjay's proposal. I am all for symlinks to any arbitrary path (dirs or files). My initial
proposal was to gauge the feeling of the community on figuring out whether it is better to
get symlinks to files into 0.19 and then continue to work to make symlinks to any arbitrary
path in 0.20. The code is not difficult, but there will some changes to existing interfaces
for DistributedFileSystem.java.

"kickbaks" are hard, not from a design point of view but for coding point of view....especially
because we do not want to throw UnresolvedPathException all the way back to the client. This
means, the NameNode has to send back the "kickback" information as part of the result code
for almost every RPC. This, in turn, means that almost all APIs in ClientProtocol will have
to be modified.

> 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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