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https://issues.apache.org/jira/browse/HDFS-6688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14062640#comment-14062640
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Andrew Wang commented on HDFS-6688:
-----------------------------------
Hi Biju, did you wait 10.5 minutes for the default dead nodes timeout before
checking these stats? Did you also compare the JMX stats with the display on
the webui? I'd expect these to be the same, but we have had some issues here in
the past.
> Hadoop JMX stats are not refreshed
> ----------------------------------
>
> Key: HDFS-6688
> URL: https://issues.apache.org/jira/browse/HDFS-6688
> Project: Hadoop HDFS
> Issue Type: Bug
> Environment: Ubuntu
> Reporter: Biju Nair
>
> Even when the HDFS datanode process is stopped the JMX attribute
> Hadoop.NameNode.FSNamesystemState.NumLiveDataNodes/NumDeadDataNodes attribute
> values doesn't change. Also Hadoop.NameNode.NameNodeInfo.Attributes.LiveNodes
> shows the stopped datanode details. If these attributes reflect the actual
> changes in the datanode, they can be used to monitor the health of the HDFS
> cluster which currently can't be used.
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