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From "Suresh Srinivas (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2978) The NameNode should expose name dir statuses as metrics
Date Thu, 23 Feb 2012 18:54:49 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2978?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13214933#comment-13214933

Suresh Srinivas commented on HDFS-2978:

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

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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