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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4044) Create symbolic links in HDFS
Date Thu, 09 Oct 2008 02:01:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12638171#action_12638171
] 

Owen O'Malley commented on HADOOP-4044:
---------------------------------------

Doug,
   I don't see your point. Clearly this is not black and white at all or it wouldn't have
caused so much disagreement among the developers.  I still think the core disagreement is
whether hitting a link is enough of an exception to be reasonably implemented as a Java exception.
Most of the rest of it I consider supporting arguments. *smile*

In particular, we aren't changing the FileSystem API at all. No client code should be able
to detect the difference between the versions before and after. What is changing is the RPC
layer and I agree that we effectively have a tagged union between the link result and the
actual result. I still don't think either is very nice looking, which is why I was falling
back to supporting arguments.

I think defining result types will give us significant advantages going forward.
  1. It is easy to add additional information in a forward/backward compatible manner.
  2. It is declared and strongly type checked.
  3. It doesn't throw exceptions. *grin*

> 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, 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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