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https://issues.apache.org/jira/browse/HDFS-6326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13995723#comment-13995723
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Chris Nauroth commented on HDFS-6326:
-------------------------------------

bq. Should we avoid changing PBHelper. convert(FsPermission) and just let 
FsAclPermission#toShort serialize the bit?

Actually, I take it back.  We can't do this part.  The point of 
{{FsAclPermission}} was to hide the ACL bit from being visible in the bit 
representation.  If the subclass just overrides {{toShort}} to do this, then it 
defeats the purpose.  I'll keep this logic in {{PBHelper}}.

> WebHdfs ACL compatibility is broken
> -----------------------------------
>
>                 Key: HDFS-6326
>                 URL: https://issues.apache.org/jira/browse/HDFS-6326
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: webhdfs
>    Affects Versions: 3.0.0, 2.4.0
>            Reporter: Daryn Sharp
>            Assignee: Chris Nauroth
>            Priority: Blocker
>         Attachments: HDFS-6326.1.patch, HDFS-6326.2.patch, HDFS-6326.3.patch
>
>
> 2.4 ACL support is completely incompatible with <2.4 webhdfs servers.  The NN 
> throws an {{IllegalArgumentException}} exception.
> {code}
> hadoop fs -ls webhdfs://nn/
> Found 21 items
> ls: Invalid value for webhdfs parameter "op": No enum constant 
> org.apache.hadoop.hdfs.web.resources.GetOpParam.Op.GETACLSTATUS
> [... 20 more times...]
> {code}



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