[jira] [Created] (HADOOP-14502) Confusion/name conflict between NameNodeActivity#BlockReportNumOps and RpcDetailedActivity#BlockReportNumOps

["Erik Krogen (JIRA)" <ji...@apache.org>]

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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