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https://issues.apache.org/jira/browse/HDFS-2275?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13087960#comment-13087960
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Allen Wittenauer commented on HDFS-2275:
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It looks as though the JMX value only reports the number of nodes that were
marked down during runtime. As a result, the namenode web UI reports a
different value than the JMX value after a restart of the NN. This has some
significant consequences for alerting.
> Bouncing the namenode causes JMX deadnode count to drop to 0
> ------------------------------------------------------------
>
> Key: HDFS-2275
> URL: https://issues.apache.org/jira/browse/HDFS-2275
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: name-node
> Affects Versions: 0.20.203.0
> Reporter: Allen Wittenauer
>
> The namenode JMX metrics and the namenode web UI disagree on the number of
> dead nodes. See comments.
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