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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1665) DFS Trash feature bugs
Date Mon, 06 Aug 2007 16:59:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12517985
] 

dhruba borthakur commented on HADOOP-1665:
------------------------------------------

I agree that the location of the file in /Trash might not be enough to determine the latest
copy of the file. One can use the "last modification time" of the file to determine the latest
copy of the file in Trash (this approach is not foolproof either). However, I think the most
common cases are addressed by this patch.

I would hesitate to decrease the replication factor when it gets moved to Trash.

> DFS Trash feature bugs
> ----------------------
>
>                 Key: HADOOP-1665
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1665
>             Project: Hadoop
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.13.1
>            Reporter: Nigel Daley
>            Assignee: dhruba borthakur
>            Priority: Blocker
>             Fix For: 0.14.0
>
>         Attachments: Trash2.patch
>
>
> In testing the DFS Trash feature, I've run across a couple of bugs.
> 1) Attempting to remove the same file fails when attempted within the same fs.trash.interval:
>     % bin/hadoop dfs -put file /file
>     % bin/hadoop dfs -rm /file
>     Moved to trash: /file
>     % bin/hadoop dfs -put file /file
>     % bin/hadoop dfs -rm /file
>     rm: Failed to move to trash: /file
> 2) Removing a file within a directory, followed by removing the directory creates a bizzare
hierarchy within /Trash:
>     % bin/hadoop dfs -mkdir /dir
>     % bin/hadoop dfs -put file /dir/file
>     % bin/hadoop dfs -rm /dir/file
>     Moved to trash: /dir/file
>     % bin/hadoop dfs -rmr /dir
>     Moved to trash: /dir
>     % bin/hadoop dfs -lsr /Trash
>     /Trash/Current  <dir>
>     /Trash/Current/dir      <dir>
>     /Trash/Current/dir/dir  <dir>     <-- This is weird; potentially related
to a rename case not fixed by HADOOP-1623 ???
>     /Trash/Current/dir/file <r 3>   10

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