Xiao Chen created HDFS-12668:
--------------------------------
Summary: MetricsSystemImpl should consistently check minicluster
mode
Key: HDFS-12668
URL: https://issues.apache.org/jira/browse/HDFS-12668
Project: Hadoop HDFS
Issue Type: Bug
Components: test
Reporter: Xiao Chen
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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