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From "Bikas Saha (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8694) Create true symbolic links on Windows
Date Thu, 13 Sep 2012 01:42:08 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13454562#comment-13454562

Bikas Saha commented on HADOOP-8694:

The vcproj changes look like all lines have edits? Is it some line ending issue? Could you
run this through dos2unix?
> 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
>         Attachments: HADOOP-8694-branch-1-win-2.patch, HADOOP-8694-branch-1-win.patch,
> 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
> 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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