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https://issues.apache.org/jira/browse/HADOOP-887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12464369
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Raghu Angadi commented on HADOOP-887:
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and '.'? datanode.reads, datanode.writes is more human friendly than
namenode_reads and consistent with hadoop config names.
> metrics API should enforce some restrictions on tag and metric names
> --------------------------------------------------------------------
>
> Key: HADOOP-887
> URL: https://issues.apache.org/jira/browse/HADOOP-887
> Project: Hadoop
> Issue Type: Improvement
> Components: metrics
> Affects Versions: 0.10.1
> Reporter: Nigel Daley
> Priority: Minor
>
> The metrics API currently allows any string to be a metric name or tag name
> (see org.apache.hadoop.metrics.Metrics.createRecord(...) and
> org.apache.hadoop.metrics .Metrics.report(...)).
> Such unrestricted names makes it difficult to implement metrics providers
> that generate source code to manipulate these metrics, since many characters
> are invalid as method or variable names.
> I'd like to propose that metric names be restricted to letters, digits, and
> underscore (A-Za-z0-9_) and this restriction be documented and enforced by
> the API.
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