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https://issues.apache.org/jira/browse/HADOOP-19457?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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John Doe updated HADOOP-19457:
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Summary: Missing null check before using shared resource (was:
MetricsException thrown since miniClusterMode off)
> Missing null check before using shared resource
> -----------------------------------------------
>
> Key: HADOOP-19457
> URL: https://issues.apache.org/jira/browse/HADOOP-19457
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 3.4.1
> Reporter: John Doe
> Priority: Major
>
> In `DefaultMetricsSystem`, if `miniClusterMode` is set to false by other
> functions, `newSourceName` exits with a MetricsException
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