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