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https://issues.apache.org/jira/browse/HDFS-2978?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13214933#comment-13214933
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Suresh Srinivas commented on HDFS-2978:
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One of the things that was done in 0.23 (available in 1.0) was to add every
thing exposed in Namenode webUI to the JMX interfaces on the namenode. This
interface is accessible over http. I believe this information was added to NN
WebUI, post that. We should add it to JMX interfaces.
One thing I notice with some of these Jiras is, Aaron you keep saying metrics.
Metrics to me is an interface where keep track of peg counts, rate etc, for
measurement purposes. The information such as dirs etc to me belongs to
management interface and that is where JMX interfaces come in. So we should add
this to the JMX interface. Also we need to enforce adding any info added to NN
web UI to the JMX interface.
> The NameNode should expose name dir statuses as metrics
> -------------------------------------------------------
>
> Key: HDFS-2978
> URL: https://issues.apache.org/jira/browse/HDFS-2978
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: name-node
> Affects Versions: 0.23.0
> Reporter: Aaron T. Myers
> Assignee: Aaron T. Myers
>
> We currently display this info on the NN web UI, so users who wish to monitor
> this must either do it manually or parse HTML. We should publish this
> information as proper metrics.
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