TestAMRMRPCNodeUpdates fails ocassionally

junit.framework.AssertionFailedError: expected:<0> but was:<4>
	at junit.framework.Assert.fail(Assert.java:50)
	at junit.framework.Assert.failNotEquals(Assert.java:287)
	at junit.framework.Assert.assertEquals(Assert.java:67)
	at junit.framework.Assert.assertEquals(Assert.java:199)
	at junit.framework.Assert.assertEquals(Assert.java:205)
	at org.apache.hadoop.yarn.server.resourcemanager.applicationsmanager.TestAMRMRPCNodeUpdates.testAMRMUnusableNodes(TestAMRMRPCNodeUpdates.java:136)