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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-432) support undelete, snapshots, or other mechanism to recover lost files
Date Fri, 02 Mar 2007 21:37:51 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-432?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12477459
] 

Hairong Kuang commented on HADOOP-432:
--------------------------------------

+1 This patch looks good.

Two comments:
1. It would be more user-friendly if an "undelete" command is provided in FSShell.
2. Currently the checkpointing frequency is the same as the expunging frequency. I feel that
it might be better if we checkpoint more frequently than we expunge. This makes sense especially
when we provide the "expunge" command. It allows a user to expunge some checkpoints in between
two system-initated expungings.

> support undelete, snapshots, or other mechanism to recover lost files
> ---------------------------------------------------------------------
>
>                 Key: HADOOP-432
>                 URL: https://issues.apache.org/jira/browse/HADOOP-432
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: dfs
>            Reporter: Yoram Arnon
>         Assigned To: Doug Cutting
>             Fix For: 0.12.0
>
>         Attachments: trash.patch, trash2.patch, trash3.patch, 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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