YARN-5773. RM recovery too slow due to LeafQueue#activateApplications (Bibin A Chundatt via Varun Saxena)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/CSAMContainerLaunchDiagnosticsConstants.java

@@ -32,4 +32,6 @@ public interface CSAMContainerLaunchDiagnosticsConstants {
   String USER_AM_RESOURCE_LIMIT_EXCEED = "User's AM resource limit exceeded. ";
   String LAST_NODE_PROCESSED_MSG =
       " Last Node which was processed for the application : ";
+  String CLUSTER_RESOURCE_EMPTY =
+      "Skipping AM assignment as cluster resource is empty. ";
 }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/LeafQueue.java

@@ -684,9 +684,11 @@ public class LeafQueue extends AbstractCSQueue {
         } else {
           application.updateAMContainerDiagnostics(AMState.INACTIVATED,
               CSAMContainerLaunchDiagnosticsConstants.QUEUE_AM_RESOURCE_LIMIT_EXCEED);
-          LOG.info("Not activating application " + applicationId
-              + " as  amIfStarted: " + amIfStarted + " exceeds amLimit: "
-              + amLimit);
+          if (LOG.isDebugEnabled()) {
+            LOG.debug("Not activating application " + applicationId
+                + " as  amIfStarted: " + amIfStarted + " exceeds amLimit: "
+                + amLimit);
+          }
           continue;
         }
       }
@@ -718,9 +720,11 @@ public class LeafQueue extends AbstractCSQueue {
         } else {
           application.updateAMContainerDiagnostics(AMState.INACTIVATED,
               CSAMContainerLaunchDiagnosticsConstants.USER_AM_RESOURCE_LIMIT_EXCEED);
-          LOG.info("Not activating application " + applicationId
-              + " for user: " + user + " as userAmIfStarted: "
-              + userAmIfStarted + " exceeds userAmLimit: " + userAMLimit);
+          if (LOG.isDebugEnabled()) {
+            LOG.debug("Not activating application " + applicationId
+                + " for user: " + user + " as userAmIfStarted: "
+                + userAmIfStarted + " exceeds userAmLimit: " + userAMLimit);
+          }
           continue;
         }
       }
@@ -750,8 +754,17 @@ public class LeafQueue extends AbstractCSQueue {
     applicationAttemptMap.put(application.getApplicationAttemptId(), application);
 
     // Activate applications
-    activateApplications();
-    
+    if (Resources.greaterThan(resourceCalculator, lastClusterResource,
+        lastClusterResource, Resources.none())) {
+      activateApplications();
+    } else {
+      application.updateAMContainerDiagnostics(AMState.INACTIVATED,
+          CSAMContainerLaunchDiagnosticsConstants.CLUSTER_RESOURCE_EMPTY);
+      LOG.info("Skipping activateApplications for "
+          + application.getApplicationAttemptId()
+          + " since cluster resource is " + Resources.none());
+    }
+
     LOG.info("Application added -" +
         " appId: " + application.getApplicationId() +
         " user: " + application.getUser() + "," +

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestClientRMService.java

@@ -1627,7 +1627,7 @@ public class TestClientRMService {
     MockRM rm = new MockRM(conf);
     rm.init(conf);
     rm.start();
-
+    rm.registerNode("host1:1234", 1024);
     // Start app1 with appPriority 5
     RMApp app1 = rm.submitApp(1024, Priority.newInstance(appPriority));
 

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

@@ -693,16 +693,18 @@ public class TestApplicationPriority {
       Thread.sleep(500);
     }
 
-    // Before NM registration, AMResourceLimit threshold is 0. So 1st
-    // applications get activated nevertheless of AMResourceLimit threshold
-    // Two applications are in pending
-    Assert.assertEquals(1, defaultQueue.getNumActiveApplications());
-    Assert.assertEquals(2, defaultQueue.getNumPendingApplications());
+    // Before NM registration, AMResourceLimit threshold is 0. So no
+    // applications get activated.
+    Assert.assertEquals(0, defaultQueue.getNumActiveApplications());
 
     // NM resync to new RM
     nm1.registerNode();
     dispatcher1.await();
 
+    Assert.assertEquals(2, defaultQueue.getNumActiveApplications());
+    Assert.assertEquals(1, defaultQueue.getNumPendingApplications());
+
+
     // wait for activating one applications
     count = 5;
     while (count-- > 0) {

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

@@ -2931,12 +2931,14 @@ public class TestCapacityScheduler {
   @Test(timeout = 30000)
   public void testAMUsedResource() throws Exception {
     MockRM rm = setUpMove();
+    rm.registerNode("127.0.0.1:1234", 4 * GB);
+
     Configuration conf = rm.getConfig();
     int minAllocMb =
         conf.getInt(YarnConfiguration.RM_SCHEDULER_MINIMUM_ALLOCATION_MB,
             YarnConfiguration.DEFAULT_RM_SCHEDULER_MINIMUM_ALLOCATION_MB);
     int amMemory = 50;
-    assertTrue("AM memory is greater than or equql to minAllocation",
+    assertTrue("AM memory is greater than or equal to minAllocation",
         amMemory < minAllocMb);
     Resource minAllocResource = Resource.newInstance(minAllocMb, 1);
     String queueName = "a1";
@@ -3285,6 +3287,7 @@ public class TestCapacityScheduler {
   private void verifyAMLimitForLeafQueue(CapacitySchedulerConfiguration config)
       throws Exception {
     MockRM rm = setUpMove(config);
+    rm.registerNode("127.0.0.1:1234", 2 * GB);
 
     String queueName = "a1";
     String userName = "user_0";