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From "Yang He (JIRA)" <j...@apache.org>
Subject [jira] Yang He shared "HADOOP-10161: 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." with you
Date Mon, 16 Dec 2013 08:30:07 GMT
    Yang He shared an issue with you
    ----------------------------------

    can somebody review this ? thranks. this issue is significant for hbase,since region metrics
is invalidate when region splited;

> 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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