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