YARN-3564. Fix TestContainerAllocation.testAMContainerAllocationWhenDNSUnavailable fails randomly. (Jian He via wangda)

hadoop-yarn-project/CHANGES.txt

@@ -274,6 +274,9 @@ Release 2.8.0 - UNRELEASED
     YARN-3533. Test: Fix launchAM in MockRM to wait for attempt to be scheduled.
     (Anubhav Dhoot via jianhe)
 
+    YARN-3564. Fix TestContainerAllocation.testAMContainerAllocationWhenDNSUnavailable 
+    fails randomly. (Jian He via wangda)
+
 Release 2.7.1 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/TestContainerAllocation.java

@@ -325,7 +325,6 @@ public class TestContainerAllocation {
     }
 
     SecurityUtilTestHelper.setTokenServiceUseIp(false);
-    rm1.waitForState(attempt.getAppAttemptId(), RMAppAttemptState.ALLOCATED);
     MockRM.launchAndRegisterAM(app1, rm1, nm1);
   }
 }