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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4044) Create symbolic links in HDFS
Date Fri, 10 Oct 2008 15:45:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12638577#action_12638577
] 

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

> clients are responsible to resolve links before using it 

That might be a reasonable contract, but correct use of the API would then involve extra RPCs
to check links before trying to open them, no?  But if it is expected that folks will regularly
pass unresolved links, then we shouldn't use an exception, since callers of this method would
be expected to immediately handle the case of unresolved links.  There's no need for a throw,
as there might be for, e.g., FileNotFound, which must be handled at some unknown layer above.
 Exceptions are a long-distance goto, a control mechanism that should be reserved for cases
that require them, where the catcher is unknown.


> 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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