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From "Hari Mankude (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4758) Disallow nested snapshottable directories
Date Thu, 25 Apr 2013 22:36:17 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13642316#comment-13642316
] 

Hari Mankude commented on HDFS-4758:
------------------------------------

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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