Chuan Liu created HADOOP-8694:
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Summary: 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
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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