Erik Krogen created HADOOP-14502:
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Summary: Confusion/name conflict between
NameNodeActivity#BlockReportNumOps and RpcDetailedActivity#BlockReportNumOps
Key: HADOOP-14502
URL: https://issues.apache.org/jira/browse/HADOOP-14502
Project: Hadoop Common
Issue Type: Improvement
Components: metrics
Reporter: Erik Krogen
Priority: Minor
Currently the {{BlockReport(NumOps|AvgTime)}} metrics emitted under the
{{RpcDetailedActivity}} context and those emitted under the
{{NameNodeActivity}} context are actually reporting different things despite
having the same name. {{NameNodeActivity}} reports the count/time of _per
storage_ block reports, whereas {{RpcDetailedActivity}} reports the count/time
of _per datanode_ block reports. This makes for a confusing experience with two
metrics having the same name reporting different values.
We already have the {{StorageBlockReportsOps}} metric under
{{NameNodeActivity}}. Can we make {{StorageBlockReport}} a {{MutableRate}}
metric and remove {{NameNodeActivity#BlockReport}} metric? Open to other
suggestions about how to address this as well. The 3.0 release seems a good
time to make this incompatible change.
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