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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4044) Create symbolic links in HDFS
Date Tue, 07 Oct 2008 00:37:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12637324#action_12637324

Owen O'Malley commented on HADOOP-4044:

My preference is toward not using exceptions for nominal cases, and I agree with Doug that
links seem like nominal cases. Clearly, however, it isn't a slam dunk.

At the fear of crossing streams, I think that the classes like FSLinkBoolean are problematic.
I think we are better off creating a type for each method's return type. I think that a lot
of these return types should implement a class/interface (*Owen ducks*) that provides the
common interface for dereferencing the links.

The reason for having

RenameResult rename(Path src, Path dst) throws IOException;
FSLinkBoolean rename(Path src, Path dst) throws IOException;

would be that if we want our protocol to be future-proof, rename may well need to add additional
return values. If we have a bunch of methods all returning the same type, that is hard.


> 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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