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From "Chuan Liu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-8694) Create true symbolic links on Windows
Date Fri, 07 Sep 2012 20:54:07 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-8694?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chuan Liu updated HADOOP-8694:
------------------------------

    Attachment: HADOOP-8694-branch-1-win-2.patch

Attach a new patch.

>1. FileUtil#symlink: Should we log a warning on ExitCodeException to be consistent with
the previous behavior?

Add the same warning message in the new patch.

>2. symlink.c: IMO, we should remove CreateJunctionPointW if it is not used in the codebase.

Removed.

>3. Would be good to add a few test cases for the symlink functionality.

Add a new test case in TestFileUtil. [~enis] contributed this.
                
> Create true symbolic links on Windows
> -------------------------------------
>
>                 Key: HADOOP-8694
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8694
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 1-win
>            Reporter: Chuan Liu
>            Assignee: Chuan Liu
>             Fix For: 1-win
>
>         Attachments: HADOOP-8694-branch-1-win-2.patch, HADOOP-8694-branch-1-win.patch,
secpol.png
>
>
> In branch-1-win, we currently copy files for symbolic links in Hadoop on Windows. We
have talked to [~davidlao] who made the original fix, and did some investigation on Windows.
Windows began to support symbolic links (symlinks) since Vista/Server 2008. The original reason
to copy files instead of creating actual symlinks is that only Administrators has the privilege
to create symlinks on Windows _by default_. After talking to NTFS folks, we knew the reason
for that is mostly due to security, and this default behavior may not be changed in near future.
Though this behavior can be changed via  the Local Security Policy management console, i.e.
secpol.msc, under Security Settings\Local Policies\User Rights Assignment\Create symbolic
links.
>  
> In Hadoop, symlinks is mostly used to for DistributedCache and attempted logs. We felt
the usages are important enough for us to provide true symlinks support, and users need to
have the symlink creation privilege enabled on Windows to use Hadoop.
> This JIRA is created to tracking symlink support on Windows.

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