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https://issues.apache.org/jira/browse/HADOOP-4044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12629524#action_12629524
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Sanjay Radia commented on HADOOP-4044:
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There are the following 4 kinds of symbolic links:
* dot relative - relative to the directory in which the symbolic link exists
** these symbolic links can be processed in the NN without kicking it back
to the client
* volume root relative - this is relative to the root of the NN's root
** these symbolic links can be processed in the NN without kicking it back
to the client
* Relative to another file system
** these are essentially a symbolic mount. Good use case are remote NNs or
Hadoop Archives
** these symbolic links needs to be kicked back to the client to be
processed on the client side.
* Relative to the root of the client's root (ie to where the client's / points
to)
** The main use case for these is where I have a symbolic link t a genric
location (say /tmp) that is best
picked from the client's environment.
** these symbolic links needs to be kicked back to the client to be processed
on the client side.
** I believe we can avoid this last one for the first implementation since I
don't think the use case is strong.
> 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
>
>
> 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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