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https://issues.apache.org/jira/browse/HADOOP-5605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12695171#action_12695171
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Hairong Kuang commented on HADOOP-5605:
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I manually tested this patch and it worked.
> All the replicas incorrectly got marked as corrupt.
> ---------------------------------------------------
>
> Key: HADOOP-5605
> URL: https://issues.apache.org/jira/browse/HADOOP-5605
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.20.0
> Reporter: Raghu Angadi
> Assignee: Hairong Kuang
> Priority: Blocker
> Fix For: 0.20.0
>
> Attachments: reportBadBlock.patch, reportBadBlock1.patch,
> reportBadBlock2.patch
>
>
> NameNode does not handle {{reportBadBlocks()}} properly. As a result, when
> DataNode reports the corruption (only in the case of block transfer between
> two datanodes), further attempts to replicate the block end up marking all
> the replicas as corrupt!
> From the implementation, it looks like NN incorrectly uses the block object
> used in RPC to queue to neededReplication queue instead of using internal
> block object.
> will include an actual example in the next comment.
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