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https://issues.apache.org/jira/browse/YARN-4901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15227867#comment-15227867
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Karthik Kambatla commented on YARN-4901:
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TestNMReconnect fails with FairScheduler because of this.
> MockRM should clear the QueueMetrics when it starts
> ---------------------------------------------------
>
> Key: YARN-4901
> URL: https://issues.apache.org/jira/browse/YARN-4901
> Project: Hadoop YARN
> Issue Type: Bug
> Components: scheduler
> Reporter: Daniel Templeton
> Assignee: Daniel Templeton
>
> The {{ResourceManager}} rightly assumes that when it starts, it's starting
> from naught. The {{MockRM}}, however, violates that assumption. For
> example, in {{TestNMReconnect}}, each test method creates a new {{MockRM}}
> instance. The {{QueueMetrics.queueMetrics}} field is static, which means
> that when multiple {{MockRM}} instances are created, the {{QueueMetrics}}
> bleed over. Having the MockRM clear the {{QueueMetrics}} when it starts
> should resolve the issue. I haven't looked yet at scope to see how hard easy
> that is to do.
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