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Date: Fri, 6 Sep 2013 18:35:55 +0000 (UTC)
From: "Jason Lowe (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Message-ID: <JIRA.12665999.1377722451558.93425.1378492555379@arcas>
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Subject: [jira] [Commented] (HADOOP-9912) globStatus of a symlink to a
 directory does not report symlink as a directory
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    [ https://issues.apache.org/jira/browse/HADOOP-9912?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13760496#comment-13760496 ] 

Jason Lowe commented on HADOOP-9912:
------------------------------------

bq. There may be an occasional program that needs a tiny change to be compatible with symlinks. I think this is likely to be extremely rare, since getFileStatus resolves symlinks fully, and symlinks are mostly transparent to the application.

For symlinks to files, I agree most programs will "just work."  However for symlinks to directories, getFileStatus isn't applicable since directory walkers are going to rely on the status returned from listStatus rather than doing another getFileStatus on each of the results from listStatus.  That's why Pig/MapReduce break, and I suspect many other walkers would as well.
                
> 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, new-hdfs.txt, new-local.txt, old-hdfs.txt, old-local.txt
>
>
> 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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