[jira] [Resolved] (HDFS-4758) Disallow nested snapshottable directories

["Tsz Wo (Nicholas), SZE (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-4758?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tsz Wo (Nicholas), SZE resolved HDFS-4758.
------------------------------------------

       Resolution: Fixed
    Fix Version/s: Snapshot (HDFS-2802)
     Hadoop Flags: Reviewed

Thanks Jing for reviewing the patch.

I have committed this.
                
> 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
>             Fix For: Snapshot (HDFS-2802)
>
>         Attachments: h4758_20140426.patch, h4758_20140429b.patch, h4758_20140429.patch, h4758_20140430.patch
>
>
> 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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