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https://issues.apache.org/jira/browse/HBASE-25480?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Kyle Purtell resolved HBASE-25480.
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Resolution: Duplicate
> NPE when getting metrics of backup master
> -----------------------------------------
>
> Key: HBASE-25480
> URL: https://issues.apache.org/jira/browse/HBASE-25480
> Project: HBase
> Issue Type: Bug
> Components: master
> Affects Versions: 2.4.0, 2.4.1
> Reporter: Andrey Elenskiy
> Assignee: Anjan Das
> Priority: Major
> Labels: JMX, NullPointerException, master
>
> Getting NullPointerException in MetricsMasterWrapperImpl.getMergePlanCount()
> when getting metrics via JMX on backup master. It appears due to the fact
> that regionNormalizerManager is null in backup masters as it's only
> initialized by HMaster.finishActiveMasterInitialization().
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