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https://issues.apache.org/jira/browse/HADOOP-9912?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13760020#comment-13760020
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Colin Patrick McCabe commented on HADOOP-9912:
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Hi all. There's been some confusion about old and new behavior, so I created a
test program so you can see for yourself. Then I ran it on a very old branch-2
derived Hadoop (CDH 4.0.0, in fact), as well as current trunk. The old branch
is from June 2012.
The summary:
* on HDFS, the behavior of listStatus *has always been* not resolving symlinks.
Ever since Eli added the feature a few years ago. It has never dereferenced.
* on HDFS, {{globStatus}} was previously inconsistent about whether symlinks
that were the last path component were dereferenced-- sometimes they were,
other times not. Now they are never dereferenced.
* on LocalFileSystem, {{getFileLinkStatus}} previously did the exact same thing
as {{getFileStatus}} (oops!) This *bug* was fixed, and now calling
{{getFileLinkStatus}} on a symlink allows you to identify it as a symlink.
* {{LocalFS}} had a bug then, which it apparently stil has, where
{{listStatus}} doesn't list dangling symlinks at all. Hopefully we'll be able
to fix this bug without people asking for the old broken behavior.
* There are some other irregularities in {{LocalFS}}. In general symlink
support seems very poor in LocalFS.
the test program is up on github at https://github.com/cmccabe/HADOOP-9912_test
> globStatus of a symlink to a directory does not report symlink as a directory
> -----------------------------------------------------------------------------
>
> Key: HADOOP-9912
> URL: https://issues.apache.org/jira/browse/HADOOP-9912
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs
> Affects Versions: 2.3.0
> Reporter: Jason Lowe
> Priority: Blocker
> Attachments: HADOOP-9912-testcase.patch
>
>
> globStatus for a path that is a symlink to a directory used to report the
> resulting FileStatus as a directory but recently this has changed.
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