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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10161) Add a method to change the default value of dmax in hadoop.properties
Date Mon, 16 Dec 2013 18:31:08 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13849437#comment-13849437
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Colin Patrick McCabe commented on HADOOP-10161:
-----------------------------------------------

I'm not that familiar with ganglia.  What is the potential harm to current ganglia+hadoop
users of making this change?  Their old unused metrics will disappear even though they didn't
expect it?

> 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-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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