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https://issues.apache.org/jira/browse/HADOOP-432?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12477459
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Hairong Kuang commented on HADOOP-432:
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+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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