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https://issues.apache.org/jira/browse/YARN-7602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16277068#comment-16277068
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Mike Drob commented on YARN-7602:
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There is no assertions in {{testReferenceOfSingletonJvmMetrics}}.
Would we want to check that the same instance is returned before and after
calls to {{initSingleton}}? Before and after starting a NM?
> NM should reference the singleton JvmMetrics instance
> -----------------------------------------------------
>
> Key: YARN-7602
> URL: https://issues.apache.org/jira/browse/YARN-7602
> Project: Hadoop YARN
> Issue Type: Bug
> Components: nodemanager
> Affects Versions: 3.0.0-beta1
> Reporter: Haibo Chen
> Assignee: Haibo Chen
> Attachments: YARN-7602.00.patch
>
>
> NM does not reference the singleton JvmMetrics instance in its
> NodeManagerMetrics. This will easily cause NM to crash if any of the node
> manager components tries to register JvmMetrics. An example of this is
> TimelineCollectorManager that hosts a HBaseClient that registers JvmMetrics
> again. See HBASE-19409 for details.
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