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From "Yoram Arnon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-432) support undelete, snapshots, or other mechanism to recover lost files
Date Sat, 02 Dec 2006 02:10:22 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-432?page=comments#action_12455068 ] 
            
Yoram Arnon commented on HADOOP-432:
------------------------------------

-yes, trashSize should be kept up to date.
-I don't understand the concept of 'trash dir is full'. It's just a location in dfs - it can't
be full if the dfs isn't full.
-when taking out the trash, the idea is to remove the oldest items *only if they're older
than mintime*, until the trash size is under maxsize, and then stop. 
-size of the trash may be larger than maxsize if items in the trash are too new.
-if the DFS fills up then normal writes will fail until mintime is reached for some trash
items or mintime is decreased, or maxsize is decreased. 

-Perhaps an admin command than clears the trash now would help after a very large one-time
deletion of data.

> 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: undelete.patch, undelete11.patch, undelete12.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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