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From "Sanjay Radia (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4044) Create symbolic links in HDFS
Date Wed, 15 Oct 2008 00:00:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12639653#action_12639653
] 

Sanjay Radia commented on HADOOP-4044:
--------------------------------------

Owen> I would probably use a thread local variable to measure the depth of the traversal.
It isn't great, but it would be encapsulated in LinkResult.

Doug> I see. Yuck.

I second the Yuck.

Doug> Perhaps we're prematurely optimizing here. Perhaps the extra RPCs to resolve paths
won't hurt things that much. 

The above was in reference to Dhruba's approach of using the FSLinkResolver abstract class
 verses  Owen's more inline approach.
While Dhruba's FSLinkResolver is a little more complex, it is not complex enough to warrant
doing the additional RPC.  
We might be able to further simplify it by using a LinkableFileSystem base class as Doug suggested.

I really don't like the extra rpc  for any method that has a pathname as a parameter regardless
 of whether or not a link is in the path.

> 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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