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https://issues.apache.org/jira/browse/HDFS-4666?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13631891#comment-13631891
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Jing Zhao commented on HDFS-4666:
---------------------------------
I think 1 may be better than 2. For 2, a problem may be that after we upgrade
the version, when we find a file/directory named ".snapshot", the current
implementation will treat the file/dir's path as a read-only path, and disallow
further rename/deletion operations on the file/dir. To fix this issue can add
more complexity to the current INodeDirectory#getExistingPathINodes method.
Besides, I think we can also do this in a separate jira and just throw an
exception in this jira.
> Disallow users to create file/dir named ".snapshot"
> ---------------------------------------------------
>
> Key: HDFS-4666
> URL: https://issues.apache.org/jira/browse/HDFS-4666
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode, namenode
> Reporter: Jing Zhao
> Assignee: Tsz Wo (Nicholas), SZE
> Attachments: h4666_20130413b.patch, h4666_20130413.patch
>
>
> Currently ".snapshot" is reserved by snapshots as a special tag to specify
> the path leading to snapshot copies. We should disallow users to create
> file/dir using name ".snapshot".
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