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https://issues.apache.org/jira/browse/HADOOP-14953?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bharat Viswanadham reassigned HADOOP-14953:
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Assignee: Bharat Viswanadham
> MetricsSystemImpl should consistently check minicluster mode
> ------------------------------------------------------------
>
> Key: HADOOP-14953
> URL: https://issues.apache.org/jira/browse/HADOOP-14953
> Project: Hadoop Common
> Issue Type: Bug
> Components: test
> Reporter: Xiao Chen
> Assignee: Bharat Viswanadham
> Priority: Minor
>
> Found this when writing some tests related to JvmMetrics.
> It appears {{JvmMetrics.initSingleton}} twice in minicluster works, but
> {{JvmMetrics.create}} twice doesn't.
> This jira suggests to investigate whether this is intentional, and likely
> make the check of {{DefaultMetricsSystem.inMiniClusterMode()}} consistent in
> {{MetricsSystemImpl}} to ease testing.
> {noformat}
> org.apache.hadoop.metrics2.MetricsException: Metrics source JvmMetrics
> already exists!
> at
> org.apache.hadoop.metrics2.lib.DefaultMetricsSystem.newSourceName(DefaultMetricsSystem.java:152)
> at
> org.apache.hadoop.metrics2.lib.DefaultMetricsSystem.sourceName(DefaultMetricsSystem.java:125)
> at
> org.apache.hadoop.metrics2.impl.MetricsSystemImpl.register(MetricsSystemImpl.java:229)
> at
> org.apache.hadoop.metrics2.source.JvmMetrics.create(JvmMetrics.java:95)
> {noformat}
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