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https://issues.apache.org/jira/browse/HADOOP-4103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12790519#action_12790519
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dhruba borthakur commented on HADOOP-4103:
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Hi Raghu: really appreciate it if you remember why
BlocksManager.getMissingBlocksCount() does not do any locking?
> Alert for missing blocks
> ------------------------
>
> Key: HADOOP-4103
> URL: https://issues.apache.org/jira/browse/HADOOP-4103
> Project: Hadoop Common
> Issue Type: New Feature
> Affects Versions: 0.17.2
> Reporter: Christian Kunz
> Assignee: Raghu Angadi
> Fix For: 0.20.0
>
> Attachments: HADOOP-4103-branch-20.patch, HADOOP-4103.patch,
> HADOOP-4103.patch, HADOOP-4103.patch, HADOOP-4103.patch
>
>
> A whole bunch of datanodes became dead because of some network problems
> resulting in heartbeat timeouts although datanodes were fine.
> Many processes started to fail because of the corrupted filesystem.
> In order to catch and diagnose such problems faster the namenode should
> detect the corruption automatically and provide a way to alert operations. At
> the minimum it should show the fact of corruption on the GUI.
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