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https://issues.apache.org/jira/browse/HADOOP-4610?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12645861#action_12645861
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Raghu Angadi commented on HADOOP-4610:
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I think this should go into 0.18.3. This is a serious regression if 'extension' 
is set to 0 in some config. It will be many month before 0.20. becomes the 
stable branch. Note that we would have thought threshold being set to 1.1 would 
be rare.. but it happens. 

+1 for the patch.



> Always calculate mis-replicated blocks when safe-mode is turned off.
> --------------------------------------------------------------------
>
>                 Key: HADOOP-4610
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4610
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.18.0
>            Reporter: Konstantin Shvachko
>            Assignee: Konstantin Shvachko
>             Fix For: 0.20.0
>
>         Attachments: NeededReplAlways.patch
>
>
> After HADOOP-4597 there is one last case when mis-replicated blocks are not 
> processed. It is when the safe-mode {{extension = 0}}.
> We should regenerate {{neededReplications}} and {{excessReplicateMap}} 
> whenever the safe mode is turned off.

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