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https://issues.apache.org/jira/browse/HADOOP-6918?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Luke Lu resolved HADOOP-6918.
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Resolution: Fixed
Fix Version/s: 0.23.0
Release Note: Harmonizing metrics names
Hadoop Flags: [Incompatible change]
We adopted CapitalizedCamelCase.
> Make metrics naming consistent
> ------------------------------
>
> Key: HADOOP-6918
> URL: https://issues.apache.org/jira/browse/HADOOP-6918
> Project: Hadoop Common
> Issue Type: Improvement
> Components: metrics
> Affects Versions: 0.20.2
> Reporter: Luke Lu
> Assignee: Luke Lu
> Fix For: 0.23.0
>
>
> While working HADOOP-6728, I noticed that our metrics naming style is all
> over the place:
> * Capitalized camel case: e.g., "FilesCreated" in namenode metrics and some
> rpc metrics
> * uncapitalized camel case: e.g, "threadsBlocked" in jvm metrics and some rpc
> metrics
> * lowercased underscored: e.g., "bytes_written" in datanode metrics and
> mapreduce metrics
> Let's make them consistent. How about uncapitalized camel case? My main
> reason for the camel case: some backends have limits on the name length and
> underscore is wasteful.
> Once we have a consistent naming style we can do:
> @Metric("Number of INodes created") MutableCounterLong filesCreated;
> instead of the more redundant:
> @Metric({"FilesCreated", "Number of INodes created"}) MutableCounterLong
> filesCreated;
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