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Date: Mon, 12 Nov 2012 19:07:12 +0000 (UTC)
From: "Brandon Li (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-4148)  disallow modification on RO
 snapshots
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    [ https://issues.apache.org/jira/browse/HDFS-4148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13495514#comment-13495514 ] 

Brandon Li commented on HDFS-4148:
----------------------------------

Hi Aaron, thanks for reviewing the path.
WAFL and ZFS need to support Posix interface/errorno which doesn't have a corresponding code for snapshot related errors. But here, we have the flexibility and not confined by Posix interface. And thus DFSClient can better handle errors based on the explicate exception for snapshot. 
                
>  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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