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https://issues.apache.org/jira/browse/HDFS-4758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13642270#comment-13642270
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Hari Mankude commented on HDFS-4758:
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Actually one use case of nested snapshots that I see is that user might have
different backup policies for /user (once every day) and /user/hive (every 8
hrs). When backing up /user, it is possible to setup exclusions of /user/hive
directory so that two copies of /user/hive is not made. However, if snapshots
cannot be taken of /user and /user/hive at the same time, it would be a
disadvantage.
> 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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