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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4044) Create symbolic links in HDFS
Date Mon, 06 Oct 2008 18:37:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12637170#action_12637170

Doug Cutting commented on HADOOP-4044:

> Here the author is distinguishing between declared and undeclared - but the point is
that declared exceptions are okay for recoverable conditions.

Unfortunately that is not the question here.  He, among many others, says not to use exceptions
for normal control flow.  Links in a filesystem are normal.  They are not conditions out of
the control of the code in question.

> otherwise all the interfaces and code would have become unclean.

What does 'unclean' mean?  The interfaces should reflect their function.  We're making a fundamental
change to these interfaces.  The return types of all of these operations must change.  We
could implement a return type change with exceptions or thread locals.  Either would require
fewer changes to the code, but both would be terrible programming style.  We need to suck
it up and change the return types consistently to reflect the change in semantics.  Let's
not call something 'unclean' just because it is more work.

> 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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