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https://issues.apache.org/jira/browse/YARN-4901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16802731#comment-16802731
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Peter Bacsko commented on YARN-4901:
------------------------------------
[~snemeth] [~templedf] could you look at this short patch?
I also added {{DefaultMetricsSystem.shutdown()}} because it unregisters an
object on JMX. If we don't do this, we might get:
{noformat}
org.apache.hadoop.metrics2.MetricsException:
org.apache.hadoop.metrics2.MetricsException:
Hadoop:service=ResourceManager,name=RMNMInfo already exists!
at
org.apache.hadoop.metrics2.lib.DefaultMetricsSystem.newObjectName(DefaultMetricsSystem.java:135)
at
org.apache.hadoop.metrics2.lib.DefaultMetricsSystem.newMBeanName(DefaultMetricsSystem.java:110)
at org.apache.hadoop.metrics2.util.MBeans.getMBeanName(MBeans.java:123)
at org.apache.hadoop.metrics2.util.MBeans.register(MBeans.java:64)
at
org.apache.hadoop.yarn.server.resourcemanager.RMNMInfo.<init>(RMNMInfo.java:59)
at
org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$RMActiveServices.serviceInit(ResourceManager.java:749)
...
{noformat}
> 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
> Attachments: YARN-4901-001.patch
>
>
> 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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