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https://issues.apache.org/jira/browse/HADOOP-4044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12638171#action_12638171
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Owen O'Malley commented on HADOOP-4044:
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Doug,
I don't see your point. Clearly this is not black and white at all or it
wouldn't have caused so much disagreement among the developers. I still think
the core disagreement is whether hitting a link is enough of an exception to be
reasonably implemented as a Java exception. Most of the rest of it I consider
supporting arguments. *smile*
In particular, we aren't changing the FileSystem API at all. No client code
should be able to detect the difference between the versions before and after.
What is changing is the RPC layer and I agree that we effectively have a tagged
union between the link result and the actual result. I still don't think either
is very nice looking, which is why I was falling back to supporting arguments.
I think defining result types will give us significant advantages going forward.
1. It is easy to add additional information in a forward/backward compatible
manner.
2. It is declared and strongly type checked.
3. It doesn't throw exceptions. *grin*
> 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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