[ https://issues.apache.org/jira/browse/YARN-3247?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14335802#comment-14335802 ] 

Tsuyoshi OZAWA commented on YARN-3247:
--------------------------------------

+1, committing this shortly. - the default value of RM_SCHEDULER is CapacityScheduler. However, the default value can be overridden when user has modified yarn-site.xml in a class path. Also, other test cases for CapacityScheduler configure the scheduler explicitly. We should do here also.

{code}
  protected ResourceScheduler createScheduler() {
    String schedulerClassName = conf.get(YarnConfiguration.RM_SCHEDULER,
        YarnConfiguration.DEFAULT_RM_SCHEDULER);
{code}

> TestQueueMappings failure for FairScheduler
> -------------------------------------------
>
>                 Key: YARN-3247
>                 URL: https://issues.apache.org/jira/browse/YARN-3247
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: test
>            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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