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From "Sanjay Radia (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-4838) Cleanup Metrics and the MBeans
Date Mon, 15 Dec 2008 18:55:44 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-4838?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Sanjay Radia updated HADOOP-4838:

    Attachment: 4838-3.patch

Fixed the findbugs.

> Cleanup Metrics and the MBeans
> ------------------------------
>                 Key: HADOOP-4838
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4838
>             Project: Hadoop Core
>          Issue Type: Improvement
>    Affects Versions: 0.20.0
>            Reporter: Sanjay Radia
>         Attachments: 4838-1.patch, 4838-2.patch, 4838-3.patch
> This patch cleans up the metrics to make it easier to write metrics and the mbeans.
> Added a registry to the metrics so that the pushing of metrics can be done automatically.
> Also this registry is used to create dynamic mbeans from metrics.
> Added the dynamic mbeans base and changed the existing activity beans to use them.
> Also cleanup the names of the mbeans.
> Hence each time a new metrics is added to an existing set of metrics,  one needs to simply
> 1) add the metrics to a holder class (such as NameNodeMetrics
> 2) add code to update the metrics.
> The metrics will be pushed as per metrics config and it will also be published  via mbeans.
> (Previous to this patch also has to add a line of code to push and add new mbean entries).
> If one is adding a new category of metrics (ie for which a holder class does *not* exist)
> 1) create metrics holder (see NameNodeMetrics as an example)
> 2) create mbean  (see NameNodeActivityMBean as an example)

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