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https://issues.apache.org/jira/browse/HDFS-6949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16003342#comment-16003342
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Ruslan Dautkhanov commented on HDFS-6949:
-----------------------------------------

https://tools.ietf.org/html/rfc3530#section-5.11 

NFS v4 defined ACL explicitly in RFC 3530.


> Add NFS-ACL protocol support
> ----------------------------
>
>                 Key: HDFS-6949
>                 URL: https://issues.apache.org/jira/browse/HDFS-6949
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: nfs
>            Reporter: Brandon Li
>
> This is the umbrella JIRA to track the effort of adding NFS ACL support.
> ACL support for NFSv3 is known as NFSACL. It is a separate out of band 
> protocol (for NFSv3) to support ACL operations (GETACL and SETACL). There is 
> no formal documentation or RFC on this protocol.
> NFSACL program number is 100227 and version is 3. 
> The program listens on tcp port 38467.
> More reference:
> http://lwn.net/Articles/120338/
> http://cateee.net/lkddb/web-lkddb/NFS_V3_ACL.html



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