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Posted to common-issues@hadoop.apache.org by "Xiao Chen (JIRA)" <ji...@apache.org> on 2017/10/16 19:16:00 UTC
[jira] [Updated] (HADOOP-14953) MetricsSystemImpl should
consistently check minicluster mode
[ https://issues.apache.org/jira/browse/HADOOP-14953?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Xiao Chen updated HADOOP-14953:
-------------------------------
Target Version/s: 3.0.0 (was: 2.9.0)
> 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
> 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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