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https://issues.apache.org/jira/browse/HADOOP-4935?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Konstantin Shvachko updated HADOOP-4935:
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Status: Patch Available (was: Open)
> Manual leaving of safe mode may lead to data lost
> -------------------------------------------------
>
> Key: HADOOP-4935
> URL: https://issues.apache.org/jira/browse/HADOOP-4935
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.18.3
> Reporter: Hairong Kuang
> Assignee: Konstantin Shvachko
> Fix For: 0.18.3
>
> Attachments: misReplBlocks-0-18.patch, misReplBlocks.patch
>
>
> Due to HADOOP-4610, NameNode calculates mis-replicated blocks when leaving
> safe mode manually, where it clears the pending deletion queue before it does
> the calculation. This works fine when NameNode just starts but introduced a
> bug when NameNode is running for a while. Clearing the pending deletion queue
> makes NameNode not able to distinguish valid replicas from invalid ones, ie,
> the ones that have scheduled or dispatched for deletion. Therefore, NameNode
> may mistakenly decide the block is over-replicated and choose all valid ones
> to delete.
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