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https://issues.apache.org/jira/browse/HDFS-4148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13495558#comment-13495558
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Suresh Srinivas commented on HDFS-4148:
---------------------------------------

bq. for example the FSNamesystem currently catches AccessControlException in 
many places so that it can write to its audit log on access control failures.
Thanks for pointing that out. I think SnapshotAccessControlException then makes 
sense.
                
>  disallow modification on RO snapshots
> --------------------------------------
>
>                 Key: HDFS-4148
>                 URL: https://issues.apache.org/jira/browse/HDFS-4148
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: name-node
>    Affects Versions: Snapshot (HDFS-2802)
>            Reporter: Brandon Li
>            Assignee: Brandon Li
>         Attachments: HDFS-4148.patch, HDFS-4148.patch
>
>
> disallow modification on RO snapshots, including create, append, 
> setReplication/Permission/Owner, rename, delete, makedir, setQuota/Time, 
> createSymlink. 

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