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From "Tsuyoshi OZAWA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (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.
Date Mon, 16 Dec 2013 09:06:07 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13848938#comment-13848938
] 

Tsuyoshi OZAWA commented on HADOOP-10161:
-----------------------------------------

Hi Yang, thank you for reporting. Do you mean we should add a new method to change default
dmax value in the daemon to avoid forgetting configuring all dmax value in hadoop daemons?

> 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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