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https://issues.apache.org/jira/browse/HDFS-4666?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13621368#comment-13621368
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Aaron T. Myers commented on HDFS-4666:
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Along the same line: we should probably put in some code in the fsimage/edit
log upgrade code (or the NN startup code) to notice actual files/dirs already
named ".snapshot" and do something about that, for when users upgrade clusters
running HDFS versions which did not support snapshots to a version that does.
> 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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