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From "Dmytro Molkov (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-6470) JMX Context for Metrics
Date Thu, 24 Dec 2009 01:26:29 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-6470?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Dmytro Molkov updated HADOOP-6470:
----------------------------------

    Attachment: JMX.patch

I created the first iteration of the context for JMX, any comments are welcome.

Also it would be helpful if someone can come up with a way to test this context.

> JMX Context for Metrics
> -----------------------
>
>                 Key: HADOOP-6470
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6470
>             Project: Hadoop Common
>          Issue Type: New Feature
>            Reporter: Dmytro Molkov
>         Attachments: JMX.patch
>
>
> The way metrics are currently exposed to the JMX in the NameNode is not helpful, since
only the current counters in the record can be fetched and without any context those number
mean little.
> For example the number of files created equal to 150 only means that in the last period
there were 150 files created but when the new period will end is unknown so fetching 150 again
will either mean another 150 files or we are fetching the same time period.
> One of the solutions for this problem will be to have a JMX context that will accumulate
the data (being child class of AbstractMetricsContext) and expose different records to the
JMX through custom MBeans. This way the information fetched from the JMX will represent the
state of things in a more meaningful way.

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