TestFairScheduler.testContinuousScheduling fails Intermittently. Contributed by Zhihai Xu.

(cherry picked from commit 53959e69f7ef4442324627fbfb159012968a2092)

hadoop-yarn-project/CHANGES.txt

@@ -97,6 +97,9 @@ Release 2.8.0 - UNRELEASED
     YARN-3435. AM container to be allocated Appattempt AM container shown as null.
     (Bibin A Chundatt via xgong)
 
+    YARN-2666. TestFairScheduler.testContinuousScheduling fails Intermittently.
+    (Zhihai Xu via ozawa)
+
 Release 2.7.0 - 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/fair/TestFairScheduler.java

@@ -3922,12 +3922,9 @@ public class TestFairScheduler extends FairSchedulerTestBase {
             createResourceRequest(1024, 1, ResourceRequest.ANY, 2, 1, true);
     ask.clear();
     ask.add(request);
+    scheduler.stop();
     scheduler.allocate(appAttemptId, ask, new ArrayList<ContainerId>(), null, null);
-
-    // Wait until app gets resources
-    while (app.getCurrentConsumption()
-            .equals(Resources.createResource(1024, 1))) { }
-
+    scheduler.continuousSchedulingAttempt();
     Assert.assertEquals(2048, app.getCurrentConsumption().getMemory());
     Assert.assertEquals(2, app.getCurrentConsumption().getVirtualCores());