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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9061) Java6+Windows does not work well with symlinks
Date Mon, 19 Nov 2012 18:17:58 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9061?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13500453#comment-13500453
] 

Colin Patrick McCabe commented on HADOOP-9061:
----------------------------------------------

One way to handle this would be to disable symlinks on Windows unless JDK7 is present.  Another
way would be a symlink-aware implementation of operations like {{File#renameTo}} on JDK6 and
earlier.  This would have to be JNI, I think, and could be done in {{libhadoop.so}}.
                
> Java6+Windows does not work well with symlinks
> ----------------------------------------------
>
>                 Key: HADOOP-9061
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9061
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 1-win
>            Reporter: Ivan Mitic
>            Assignee: Ivan Mitic
>
> We’ve seen multiple problems with file operations on symbolic links on Java6 on Windows.
Specifically:
>  - File#length returns zero on symbolic links
>  - File#renameTo renames the target, not the symlink
> Problematic scenarios are mainly related to symlinks created for dist cache.
> Java7 does not have above problems.

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