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Posted to common-issues@hadoop.apache.org by "Erik Krogen (JIRA)" <ji...@apache.org> on 2017/06/07 18:26:18 UTC
[jira] [Commented] (HADOOP-14502) Confusion/name conflict between
NameNodeActivity#BlockReportNumOps and
RpcDetailedActivity#BlockReportNumOps
[ https://issues.apache.org/jira/browse/HADOOP-14502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16041375#comment-16041375 ]
Erik Krogen commented on HADOOP-14502:
--------------------------------------
Ping [~shv], [~zhz], thoughts?
> 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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