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From "Ming Ma (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-8706) Provide rate metrics based on counter value
Date Thu, 16 Aug 2012 00:48:38 GMT
Ming Ma created HADOOP-8706:
-------------------------------

             Summary: 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


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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