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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-432) support undelete, snapshots, or other mechanism to recover lost files
Date Thu, 28 Dec 2006 04:37:25 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-432?page=comments#action_12461144 ] 
            
Owen O'Malley commented on HADOOP-432:
--------------------------------------

Per-a-user trash directories are required once we have permissions. If you have /Trash or
whatever, the permissions on that directory would need to be world writable. That wouldn't
be acceptable, because user X could see (and delete) the files that user Y had deleted.

The solution that Linux and Mac uses with user specific delete directories seems like the
right one to me.

And yes, the cron job equivalent that cleans up the trash will need to have super-user permissions.

> support undelete, snapshots, or other mechanism to recover lost files
> ---------------------------------------------------------------------
>
>                 Key: HADOOP-432
>                 URL: http://issues.apache.org/jira/browse/HADOOP-432
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: dfs
>            Reporter: Yoram Arnon
>         Assigned To: Wendy Chien
>         Attachments: undelete12.patch, undelete16.patch, undelete17.patch
>
>
> currently, once you delete a file it's gone forever.
> most file systems allow some form of recovery of deleted files.
> a simple solution would be an 'undelete' command.
> a more comprehensive solution would include snapshots, manual and automatic, with scheduling
options.

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