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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 21:56:17 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13642270#comment-13642270
] 

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

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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