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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4685) Implementation of extended file acl in hdfs
Date Thu, 11 Apr 2013 15:29:16 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13629011#comment-13629011
] 

Chris Nauroth commented on HDFS-4685:
-------------------------------------

Hello, Sachin.  Nice to meet you.

Yes, I have been researching POSIX ACL support in HDFS.  I'll post a design doc on this jira
as soon as I'm ready to present the details.

At a high level, I'm going to propose that we implement extended attributes first, and then
use xattrs as a building block for implementing POSIX ACLs.  Other file systems have taken
this approach.  The biggest challenge I see is selecting a data structure design for storage
of the xattrs that gives us a satisfactory space-time trade-off.  I've found this document
to be helpful for explaining the functionality of POSIX ACLs and providing some background
on the implementation decisions other file systems have made:

http://users.suse.com/~agruen/acl/linux-acls/online/

You may also want to take a look at HDFS-4672, which proposes associating storage policies
with files.  This is another feature that could use xattrs as a building block in its implementation,
so there is some discussion of xattrs on that jira.

Thanks for filing this jira!

                
> Implementation of extended file acl in hdfs
> -------------------------------------------
>
>                 Key: HDFS-4685
>                 URL: https://issues.apache.org/jira/browse/HDFS-4685
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs-client, namenode, security
>    Affects Versions: 1.1.2
>            Reporter: Sachin Jose
>            Assignee: Chris Nauroth
>            Priority: Minor
>
> Currenly hdfs doesn't support Extended file ACL. In unix extended ACL can be achieved
using getfacl and setfacl utilities. Is there anybody working on this feature ?

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