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https://issues.apache.org/jira/browse/HDFS-4758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13642316#comment-13642316
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Hari Mankude commented on HDFS-4758:
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The trade-off is between usability vs complexity. In this case, it might result
in issues where a user has taken a snapshot of /user/foo/dir1 and admin finds
that system-wide snaps cannot be taken at say /user dir levels since there are
several users with their snapshots at lower directories. This might limit the
usability of the feature.
> 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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