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From "Aaron T. Myers (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2978) The NameNode should expose name dir statuses via JMX
Date Thu, 23 Feb 2012 19:38:50 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2978?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13214975#comment-13214975
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Aaron T. Myers commented on HDFS-2978:
--------------------------------------

bq. 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.

Cool, so you agree that this info is not currently present? Just making sure.

bq. 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.

You're right - I've been inaccurate when using the term "metrics" for this. My apologies.
                
> The NameNode should expose name dir statuses via JMX
> ----------------------------------------------------
>
>                 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 via JMX.

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