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https://issues.apache.org/jira/browse/HADOOP-14502?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mingliang Liu updated HADOOP-14502:
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Target Version/s: 3.0.0-alpha4
> 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
> Assignee: 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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