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Date: Fri, 17 Aug 2012 08:13:38 +1100 (NCT)
From: "Aaron T. Myers (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HADOOP-8706) Provide rate metrics based on
 counter value
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    [ https://issues.apache.org/jira/browse/HADOOP-8706?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13436314#comment-13436314 ] 

Aaron T. Myers commented on HADOOP-8706:
----------------------------------------

Hi Ming Ma, it seems like MutableRate in metrics 2 might be appropriate here?
                
> Provide rate metrics based on counter value
> -------------------------------------------
>
>                 Key: HADOOP-8706
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8706
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: metrics
>            Reporter: Ming Ma
>         Attachments: HADOOP-8706.patch
>
>
> In production clusters, it is more useful to have ops / sec instead of increasing counter value. Take NameNodeMetrics.getBlockLocations as an example, its current type is MutableCounterLong and thus the value is increasing all the time. Quite often "num of getBlockLocations" per second is more interesting for analysis. Further I found most of the MutableCounterLong in NamenodeMetrics and DataNodeMetrics are more useful if they are expressed in terms of ops / sec. 
> I looked at all the metrics objects provided in metrics 2.0, couldn't find such type.
> FYI, hbase has its own MetricsRate object based on metrics 1.0 for this purpose.
>    

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