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https://issues.apache.org/jira/browse/HDFS-6688?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Wang resolved HDFS-6688.
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Resolution: Not a Problem
After discussion with Biju, we've decided that the stale nodes metric is
satisfactory for this usecase.
> 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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