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https://issues.apache.org/jira/browse/HDFS-4758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13642352#comment-13642352
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Tsz Wo (Nicholas), SZE commented on HDFS-4758:
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> But then the snapshot is not atomic across users, ...
It is easy to change the API to support it.
> Disallow nested snapshottable directories
> -----------------------------------------
>
> Key: HDFS-4758
> URL: https://issues.apache.org/jira/browse/HDFS-4758
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
>
> Nested snapshottable directories are supported by the current implementation.
> However, it seems that there are no good use cases for nested snapshottable
> directories. So we disable it for now until someone has a valid use case for
> it.
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