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https://issues.apache.org/jira/browse/HDFS-1371?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12906202#action_12906202
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Allen Wittenauer commented on HDFS-1371:
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Is it possible to DoS the NN by declaring all blocks and their replicas as
corrupt?
> One bad node can incorrectly flag many files as corrupt
> -------------------------------------------------------
>
> Key: HDFS-1371
> URL: https://issues.apache.org/jira/browse/HDFS-1371
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs client, name-node
> Affects Versions: 0.20.1
> Environment: yahoo internal version
> [knogu...@gwgd4003 ~]$ hadoop version
> Hadoop 0.20.104.3.1007030707
> Reporter: Koji Noguchi
>
> On our cluster, 12 files were reported as corrupt by fsck even though the
> replicas on the datanodes were healthy.
> Turns out that all the replicas (12 files x 3 replicas per file) were
> reported corrupt from one node.
> Surprisingly, these files were still readable/accessible from dfsclient
> (-get/-cat) without any problems.
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