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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4044) Create symbolic links in HDFS
Date Thu, 09 Oct 2008 18:02:46 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12638348#action_12638348
] 

Doug Cutting commented on HADOOP-4044:
--------------------------------------

Konstantin> open() does not literally return a boolean, you mean that throwing an exception
should be treated as an (boolean) indicator to whether the link should be retrieved, right?

Yes, that's what I meant.  We'd be using an exception to do something that could equivalently
done with a boolean.

> But the methods have always been conditional in that sense, because they are throwing
AccessControlException, QuotaExceededException, and FileNotFoundException. And XMountPointException
is just another exception of the same nature.

I think its nature is different.  The former are all cases where the long-distance throwing
is valuable. These are intended to be caught and processed at a higher level.   In the successful
execution of a typical application one would not expect to see these.  An XMountPointException
on the other hand would never be handled at some unknown higher level, it's always handled
at a known point.  It is expected to occur frequently in the course of a typical application's
execution as part of the intended control 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: 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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