Ming Ma created HADOOP-8706:
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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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