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https://issues.apache.org/jira/browse/HADOOP-10161?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yang He updated HADOOP-10161:
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Attachment: HADOOP-10161_1_20131217.patch
add units tests
> Add a method to change the default value of dmax in hadoop.properties
> ---------------------------------------------------------------------
>
> Key: HADOOP-10161
> URL: https://issues.apache.org/jira/browse/HADOOP-10161
> Project: Hadoop Common
> Issue Type: Improvement
> Components: metrics
> Affects Versions: 2.2.0
> Reporter: Yang He
> Attachments: HADOOP-10161_0_20131211.patch,
> HADOOP-10161_1_20131217.patch, hadoop-metrics.properties,
> hadoop-metrics2.properties
>
>
> The property of dmax in ganglia is a configurable time to rotate metrics.
> Therefore, no more value of the metric will be emit to the gmond, after
> 'dmax' seconds, then gmond will destroy the metric in memory. In Hadoop
> metrics framework, the default value of 'dmax' is 0. It means the gmond will
> never destroy the metric although the metric is disappeared. The gmetad
> daemon also does not delete the rrdtool file forever.
> We need to add a method to configure the default value of dmax for all
> metrics in hadoop.properties.
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