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https://issues.apache.org/jira/browse/HDFS-2997?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13214832#comment-13214832
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Suresh Srinivas commented on HDFS-2997:
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Please see the JMX interface (available over http) FSNamesystemMBean.
> Expose status of DNs from the NN programmatically
> -------------------------------------------------
>
> Key: HDFS-2997
> URL: https://issues.apache.org/jira/browse/HDFS-2997
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: name-node
> Affects Versions: 0.23.1
> Reporter: Aaron T. Myers
>
> Users who would like monitor the NN's view of DN health currently have two
> options: either parse the NN web UI, or call the (private API)
> DFSClient#datanodeReport. We should expose this in a nicer way, e.g. through
> metrics.
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