Tao Yang created YARN-8011:
------------------------------

             Summary: 
TestOpportunisticContainerAllocatorAMService#testContainerPromoteAndDemoteBeforeContainerStart
 fails sometimes in trunk
                 Key: YARN-8011
                 URL: https://issues.apache.org/jira/browse/YARN-8011
             Project: Hadoop YARN
          Issue Type: Bug
            Reporter: Tao Yang
            Assignee: Tao Yang


TestOpportunisticContainerAllocatorAMService#testContainerPromoteAndDemoteBeforeContainerStart
 often pass, but the following errors sometimes occur:

 
{noformat}
java.lang.AssertionError: 
Expected :15360
Actual :14336
<Click to see difference>


at org.junit.Assert.fail(Assert.java:88)
at org.junit.Assert.failNotEquals(Assert.java:743)
at org.junit.Assert.assertEquals(Assert.java:118)
at org.junit.Assert.assertEquals(Assert.java:555)
at org.junit.Assert.assertEquals(Assert.java:542)
at 
org.apache.hadoop.yarn.server.resourcemanager.TestOpportunisticContainerAllocatorAMService.verifyMetrics(TestOpportunisticContainerAllocatorAMService.java:732)
at 
org.apache.hadoop.yarn.server.resourcemanager.TestOpportunisticContainerAllocatorAMService.testContainerPromoteAndDemoteBeforeContainerStart(TestOpportunisticContainerAllocatorAMService.java:330)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at 
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at 
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at 
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at 
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at 
org.junit.internal.runners.statements.FailOnTimeout$StatementThread.run(FailOnTimeout.java:74)
{noformat}
 

This problem is caused by that deducting resource is a little behind the 
assertion. To solve this problem, It can sleep a while before this assertion as 
below.



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