YARN-8959. TestContainerResizing fails randomly (Ahmed Hussein via jeagles)

Signed-off-by: Jonathan Eagles <jeagles@gmail.com>

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

@@ -204,7 +204,7 @@ public class TestContainerResizing {
     verifyContainerDecreased(response, containerId1, 1 * GB);
 
     // Wait for scheduler to finish processing kill events..
-    dispatcher.waitForEventThreadToWait();
+    dispatcher.await();
 
     checkUsedResource(rm1, "default", 1 * GB, null);
     Assert.assertEquals(1 * GB,
@@ -605,7 +605,7 @@ public class TestContainerResizing {
     // Trigger a node heartbeat..
     cs.handle(new NodeUpdateSchedulerEvent(rmNode1));
 
-    dispatcher.waitForEventThreadToWait();
+    dispatcher.await();
     /* Check statuses after reservation satisfied */
     // Increase request should be unreserved
     Assert.assertTrue(app.getReservedContainers().isEmpty());
@@ -714,7 +714,7 @@ public class TestContainerResizing {
     am1.allocate(null, null);
 
     // Wait for scheduler to process all events.
-    dispatcher.waitForEventThreadToWait();
+    dispatcher.await();
 
     /* Check statuses after reservation satisfied */
     // Increase request should be unreserved