[jira] [Commented] (YARN-4901) MockRM should clear the QueueMetrics when it starts

["Peter Bacsko (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-4901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16802695#comment-16802695 ] 

Peter Bacsko commented on YARN-4901:
------------------------------------

It also affects {{TestApplicationLauncher.testAMLaunchAndCleanup}}. 

> 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: Peter Bacsko
>            Priority: Major
>
> 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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