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https://issues.apache.org/jira/browse/HDFS-4666?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13631192#comment-13631192
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Tsz Wo (Nicholas), SZE commented on HDFS-4666:
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For upgrading, we may throw an exception if .snapshot is used in a previous
image/edit and ask use to rename it.
> 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: Jing Zhao
>
> 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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