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https://issues.apache.org/jira/browse/HADOOP-4610?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12645920#action_12645920
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Koji Noguchi commented on HADOOP-4610:
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bq. Setting the 'extension' to 0 does not have a real use case at the moment.
If it's straightforward, it would be nice to have this fixed in 0.18.3.
We don't know how other users configure their clusters.
Less blocks go missing, less angry users on the mailing list.
> 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: 0.19.1
>
> 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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