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https://issues.apache.org/jira/browse/YARN-3247?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14336747#comment-14336747
 ] 

zhihai xu commented on YARN-3247:
---------------------------------

Thanks [~ozawa] for reviewing and committing the patch! 
Greatly appreciated.
zhihai

> TestQueueMappings should use CapacityScheduler explicitly
> ---------------------------------------------------------
>
>                 Key: YARN-3247
>                 URL: https://issues.apache.org/jira/browse/YARN-3247
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: test
>    Affects Versions: 2.6.0
>            Reporter: zhihai xu
>            Assignee: zhihai xu
>            Priority: Trivial
>         Attachments: YARN-3247.000.patch
>
>
> TestQueueMappings is only supported by CapacityScheduler.
> We should configure CapacityScheduler for this test. Otherwise if the default 
> scheduler is set to FairScheduler, the test will fail with the following 
> message:
> {code}
> Running 
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.TestQueueMappings
> Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 2.392 sec <<< 
> FAILURE! - in 
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.TestQueueMappings
> testQueueMapping(org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.TestQueueMappings)
>   Time elapsed: 2.202 sec  <<< ERROR!
> java.lang.ClassCastException: 
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.QueueMetrics cannot 
> be cast to 
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FSQueueMetrics
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FSQueueMetrics.forQueue(FSQueueMetrics.java:118)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.initScheduler(FairScheduler.java:1266)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.serviceInit(FairScheduler.java:1319)
>       at 
> org.apache.hadoop.service.AbstractService.init(AbstractService.java:163)
>       at 
> org.apache.hadoop.service.CompositeService.serviceInit(CompositeService.java:107)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$RMActiveServices.serviceInit(ResourceManager.java:558)
>       at 
> org.apache.hadoop.service.AbstractService.init(AbstractService.java:163)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.createAndInitActiveServices(ResourceManager.java:989)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.serviceInit(ResourceManager.java:255)
>       at 
> org.apache.hadoop.service.AbstractService.init(AbstractService.java:163)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.MockRM.<init>(MockRM.java:108)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.MockRM.<init>(MockRM.java:103)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.TestQueueMappings.testQueueMapping(TestQueueMappings.java:143)
> {code}



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