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https://issues.apache.org/jira/browse/HADOOP-4044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12637133#action_12637133
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Doug Cutting commented on HADOOP-4044:
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Exceptions are intended for cases where you're not sure who will catch them.
They're a non-local control-flow mechanism. Using them for normal control flow
is an abuse and leads to spaghetti logic. In this case we are changing the
FileSystem service-provider interface so that many methods can return either a
link or a normal value. The appropriate implementation is a union result type,
not exceptions. In Java we implement this union by extending a 'Linkable' base
class.
http://192.220.96.201/essays/java-style/exceptions.html
http://www.javapractices.com/topic/TopicAction.do?Id=19
http://leepoint.net/notes-java/flow/exceptions/03exceptions.html
> 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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