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https://issues.apache.org/jira/browse/HADOOP-8694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13450700#comment-13450700
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Ivan Mitic commented on HADOOP-8694:
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Thanks Chuan for the patch. It's great to see symlink functionality on Windows.
A few minor comments:
1. FileUtil#symlink: Should we log a warning on {{ExitCodeException}} to be
consistent with the previous behavior?
2. symlink.c: IMO, we should remove {{CreateJunctionPointW}} if it is not used
in the codebase.
3. Would be good to add a few test cases for the symlink functionality.
> 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.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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