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https://issues.apache.org/jira/browse/HDFS-8194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14507879#comment-14507879
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Aaron T. Myers commented on HDFS-8194:
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Those all seem like decent ideas to me, especially the bit about putting it
into JMX so that arbitrary other tools can get access to this info as well. The
crux of the problem is just that there's no way currently to introspect the
NN's view of the world with respect to the storages it's tracking.
> Add administrative tool to be able to examine the NN's view of DN storages
> --------------------------------------------------------------------------
>
> Key: HDFS-8194
> URL: https://issues.apache.org/jira/browse/HDFS-8194
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: namenode
> Affects Versions: 2.7.0
> Reporter: Aaron T. Myers
> Assignee: Colin Patrick McCabe
>
> The NN has long had facilities to be able to list all of the DNs that are
> registered with it. It would be great if there were an administrative tool be
> able to list all of the individual storages that the NN is tracking.
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