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https://issues.apache.org/jira/browse/HADOOP-4610?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12645868#action_12645868
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Konstantin Shvachko commented on HADOOP-4610:
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> I think this should go into 0.18.3.
Setting the 'extension' to 0 does not have a real use case at the moment.
I do not think we should apply it to 0.18 until a need has been developed.
I will commit it to 0.19 because this does not require a separate patch and
more testing.
> 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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