YARN-7789. Should fail RM if 3rd resource type is configured but RM uses DefaultResourceCalculator. (Zian Chen via wangda)

Change-Id: I1f6a451fe16758def6f47c046a9b8a67ad7255af
(cherry picked from commit 042ef2fa7b)

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

@@ -338,6 +338,14 @@ public class CapacityScheduler extends
       this.minimumAllocation = super.getMinimumAllocation();
       initMaximumResourceCapability(super.getMaximumAllocation());
       this.calculator = this.conf.getResourceCalculator();
+      if (this.calculator instanceof DefaultResourceCalculator
+          && ResourceUtils.getNumberOfKnownResourceTypes() > 2) {
+        throw new YarnRuntimeException("RM uses DefaultResourceCalculator which"
+            + " used only memory as resource-type but invalid resource-types"
+            + " specified " + ResourceUtils.getResourceTypes() + ". Use"
+            + " DomainantResourceCalculator instead to make effective use of"
+            + " these resource-types");
+      }
       this.usePortForNodeName = this.conf.getUsePortForNodeName();
       this.applications = new ConcurrentHashMap<>();
       this.labelManager = rmContext.getNodeLabelManager();

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

@@ -26,6 +26,7 @@ import org.apache.hadoop.yarn.api.records.Resource;
 import org.apache.hadoop.yarn.api.records.ResourceInformation;
 import org.apache.hadoop.yarn.api.records.ResourceRequest;
 import org.apache.hadoop.yarn.conf.YarnConfiguration;
+import org.apache.hadoop.yarn.exceptions.YarnRuntimeException;
 import org.apache.hadoop.yarn.security.ContainerTokenIdentifier;
 import org.apache.hadoop.yarn.server.resourcemanager.MockAM;
 import org.apache.hadoop.yarn.server.resourcemanager.MockNM;
@@ -38,6 +39,7 @@ import org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNode;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.ResourceScheduler;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.event.NodeUpdateSchedulerEvent;
 import org.apache.hadoop.yarn.server.utils.BuilderUtils;
+import org.apache.hadoop.yarn.util.resource.DefaultResourceCalculator;
 import org.apache.hadoop.yarn.util.resource.DominantResourceCalculator;
 import org.apache.hadoop.yarn.util.resource.ResourceUtils;
 import org.junit.Assert;
@@ -286,4 +288,39 @@ public class TestCapacitySchedulerWithMultiResourceTypes {
 
     rm.close();
   }
+
+  @Test
+  public void testDefaultResourceCalculatorWithThirdResourceTypes() throws Exception {
+
+    CapacitySchedulerConfiguration csconf =
+        new CapacitySchedulerConfiguration();
+    csconf.setResourceComparator(DefaultResourceCalculator.class);
+
+    YarnConfiguration conf = new YarnConfiguration(csconf);
+
+    String[] res1 = {"resource1", "M"};
+    String[] res2 = {"resource2", "G"};
+    String[] res3 = {"resource3", "H"};
+
+    String[][] test = {res1, res2, res3};
+
+    String resSt = "";
+    for (String[] resources : test) {
+      resSt += (resources[0] + ",");
+    }
+    resSt = resSt.substring(0, resSt.length() - 1);
+    conf.set(YarnConfiguration.RESOURCE_TYPES, resSt);
+
+    conf.setClass(YarnConfiguration.RM_SCHEDULER, CapacityScheduler.class,
+        ResourceScheduler.class);
+
+    boolean exception = false;
+    try {
+      MockRM rm = new MockRM(conf);
+    } catch (YarnRuntimeException e) {
+      exception = true;
+    }
+
+    Assert.assertTrue("Should have exception in CS", exception);
+  }
 }