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https://issues.apache.org/jira/browse/HADOOP-10161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13848946#comment-13848946
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Yang He commented on HADOOP-10161:
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Yes, it is necessary to add a method to change the default value of dmax,
because some metics names are not fixed, such as metics of hbase
region...(hbase.RegionServerDynamicStatistics.tbl.tsdb.region.bb82a48f6160e66c3c5e239ac5fac0a0.delete__avg_time.rrd)
> In the hadoop metrics framework,The default value of dmax is 0, which means
> gmond process will never delete this metirc although it is disappeared.
> ---------------------------------------------------------------------------------------------------------------------------------------------------
>
> 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-metrics.properties, hadoop-metrics2.properties
>
>
> The property of dmax in ganglia configration is metric dead time , when one
> metrics is disappeared ,so no more value of the metric will be emtic to the
> gmond,after 'dmax' seconds,then gmond will destroy the metric in memery . in
> hadoop metrics framework ,the default value is 0,which means the gmond will
> never destroy the metric althought the metric is disappeared ,the gmetad
> daemon also does not delete the rrdtool file ,and there does not have a
> method to configure the defualt value of dmax for all metrics .
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