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https://issues.apache.org/jira/browse/HDFS-15482?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17168103#comment-17168103
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Jitendra Nath Pandey commented on HDFS-15482:
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We will need to consider a few cases here.
1) Do we allow to create the snapshot of the same name once a snapshot is
marked for deletion, but not actually deleted? If deleted snapshots are no
longer visible, user might want to create a snapshot of the same name and get
surprised if it fails. On the other hand, if we allow it, system has two
snapshots of the same name.
2) If the snapshot is deleted and hidden, does user get to force immediate
delete (if it is in order)? It makes sense to allow users to be able to delete
immediately if user is following the order. But a hidden snapshot will not be
accessible anymore. This gets more complicated if user creates a snapshot of
the same name.
> Ordered snapshot deletion: hide the deleted snapshots from users
> ----------------------------------------------------------------
>
> Key: HDFS-15482
> URL: https://issues.apache.org/jira/browse/HDFS-15482
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: snapshots
> Reporter: Tsz-wo Sze
> Assignee: Shashikant Banerjee
> Priority: Major
>
> In HDFS-15480, the behavior of deleting the non-earliest snapshots is
> changed to marking them as deleted in XAttr but not actually deleting them.
> The users are still able to access the these snapshots as usual.
> In this JIRA, the marked-for-deletion snapshots are hided so that they become
> inaccessible
> to users.
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