YARN-8367. Fix NPE in SingleConstraintAppPlacementAllocator when placement constraint in SchedulingRequest is null. Contributed by Weiwei Yang.

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/placement/SingleConstraintAppPlacementAllocator.java

@@ -19,6 +19,7 @@
 package org.apache.hadoop.yarn.server.resourcemanager.scheduler.placement;
 
 import com.google.common.annotations.VisibleForTesting;
+import com.google.common.collect.ImmutableSet;
 import org.apache.commons.collections.IteratorUtils;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
@@ -238,110 +239,118 @@ public class SingleConstraintAppPlacementAllocator<N extends SchedulerNode>
           "Only GUARANTEED execution type is supported.");
     }
 
-    PlacementConstraint constraint =
-        newSchedulingRequest.getPlacementConstraint();
-
-    // We only accept SingleConstraint
-    PlacementConstraint.AbstractConstraint ac = constraint.getConstraintExpr();
-    if (!(ac instanceof PlacementConstraint.SingleConstraint)) {
-      throwExceptionWithMetaInfo(
-          "Only accepts " + PlacementConstraint.SingleConstraint.class.getName()
-              + " as constraint-expression. Rejecting the new added "
-              + "constraint-expression.class=" + ac.getClass().getName());
-    }
-
-    PlacementConstraint.SingleConstraint singleConstraint =
-        (PlacementConstraint.SingleConstraint) ac;
-
-    // Make sure it is an anti-affinity request (actually this implementation
-    // should be able to support both affinity / anti-affinity without much
-    // effort. Considering potential test effort required. Limit to
-    // anti-affinity to intra-app and scope is node.
-    if (!singleConstraint.getScope().equals(PlacementConstraints.NODE)) {
-      throwExceptionWithMetaInfo(
-          "Only support scope=" + PlacementConstraints.NODE
-              + "now. PlacementConstraint=" + singleConstraint);
-    }
-
-    if (singleConstraint.getMinCardinality() != 0
-        || singleConstraint.getMaxCardinality() != 0) {
-      throwExceptionWithMetaInfo(
-          "Only support anti-affinity, which is: minCardinality=0, "
-              + "maxCardinality=1");
-    }
-
-    Set<PlacementConstraint.TargetExpression> targetExpressionSet =
-        singleConstraint.getTargetExpressions();
-    if (targetExpressionSet == null || targetExpressionSet.isEmpty()) {
-      throwExceptionWithMetaInfo(
-          "TargetExpression should not be null or empty");
-    }
-
-    // Set node partition
+    // Node partition
     String nodePartition = null;
-
     // Target allocation tags
     Set<String> targetAllocationTags = null;
 
-    for (PlacementConstraint.TargetExpression targetExpression : targetExpressionSet) {
-      // Handle node partition
-      if (targetExpression.getTargetType().equals(
-          PlacementConstraint.TargetExpression.TargetType.NODE_ATTRIBUTE)) {
-        // For node attribute target, we only support Partition now. And once
-        // YARN-3409 is merged, we will support node attribute.
-        if (!targetExpression.getTargetKey().equals(NODE_PARTITION)) {
-          throwExceptionWithMetaInfo("When TargetType="
-              + PlacementConstraint.TargetExpression.TargetType.NODE_ATTRIBUTE
-              + " only " + NODE_PARTITION + " is accepted as TargetKey.");
-        }
+    PlacementConstraint constraint =
+        newSchedulingRequest.getPlacementConstraint();
 
-        if (nodePartition != null) {
-          // This means we have duplicated node partition entry inside placement
-          // constraint, which might be set by mistake.
-          throwExceptionWithMetaInfo(
-              "Only one node partition targetExpression is allowed");
-        }
+    if (constraint != null) {
+      // We only accept SingleConstraint
+      PlacementConstraint.AbstractConstraint ac = constraint
+          .getConstraintExpr();
+      if (!(ac instanceof PlacementConstraint.SingleConstraint)) {
+        throwExceptionWithMetaInfo("Only accepts "
+            + PlacementConstraint.SingleConstraint.class.getName()
+                + " as constraint-expression. Rejecting the new added "
+            + "constraint-expression.class=" + ac.getClass().getName());
+      }
 
-        Set<String> values = targetExpression.getTargetValues();
-        if (values == null || values.isEmpty()) {
-          nodePartition = RMNodeLabelsManager.NO_LABEL;
-          continue;
-        }
+      PlacementConstraint.SingleConstraint singleConstraint =
+          (PlacementConstraint.SingleConstraint) ac;
+
+      // Make sure it is an anti-affinity request (actually this implementation
+      // should be able to support both affinity / anti-affinity without much
+      // effort. Considering potential test effort required. Limit to
+      // anti-affinity to intra-app and scope is node.
+      if (!singleConstraint.getScope().equals(PlacementConstraints.NODE)) {
+        throwExceptionWithMetaInfo(
+            "Only support scope=" + PlacementConstraints.NODE
+                + "now. PlacementConstraint=" + singleConstraint);
+      }
 
-        if (values.size() > 1) {
-          throwExceptionWithMetaInfo("Inside one targetExpression, we only "
-              + "support affinity to at most one node partition now");
-        }
+      if (singleConstraint.getMinCardinality() != 0
+          || singleConstraint.getMaxCardinality() != 0) {
+        throwExceptionWithMetaInfo(
+            "Only support anti-affinity, which is: minCardinality=0, "
+                + "maxCardinality=1");
+      }
 
-        nodePartition = values.iterator().next();
-      } else if (targetExpression.getTargetType().equals(
-          PlacementConstraint.TargetExpression.TargetType.ALLOCATION_TAG)) {
-        // Handle allocation tags
-        if (targetAllocationTags != null) {
-          // This means we have duplicated AllocationTag expressions entries
-          // inside placement constraint, which might be set by mistake.
-          throwExceptionWithMetaInfo(
-              "Only one AllocationTag targetExpression is allowed");
-        }
+      Set<PlacementConstraint.TargetExpression> targetExpressionSet =
+          singleConstraint.getTargetExpressions();
+      if (targetExpressionSet == null || targetExpressionSet.isEmpty()) {
+        throwExceptionWithMetaInfo(
+            "TargetExpression should not be null or empty");
+      }
 
-        if (targetExpression.getTargetValues() == null || targetExpression
-            .getTargetValues().isEmpty()) {
-          throwExceptionWithMetaInfo("Failed to find allocation tags from "
-              + "TargetExpressions or couldn't find self-app target.");
+      for (PlacementConstraint.TargetExpression targetExpression :
+          targetExpressionSet) {
+        // Handle node partition
+        if (targetExpression.getTargetType().equals(
+            PlacementConstraint.TargetExpression.TargetType.NODE_ATTRIBUTE)) {
+          // For node attribute target, we only support Partition now. And once
+          // YARN-3409 is merged, we will support node attribute.
+          if (!targetExpression.getTargetKey().equals(NODE_PARTITION)) {
+            throwExceptionWithMetaInfo("When TargetType="
+                + PlacementConstraint.TargetExpression.TargetType.NODE_ATTRIBUTE
+                + " only " + NODE_PARTITION + " is accepted as TargetKey.");
+          }
+
+          if (nodePartition != null) {
+            // This means we have duplicated node partition entry
+            // inside placement constraint, which might be set by mistake.
+            throwExceptionWithMetaInfo(
+                "Only one node partition targetExpression is allowed");
+          }
+
+          Set<String> values = targetExpression.getTargetValues();
+          if (values == null || values.isEmpty()) {
+            nodePartition = RMNodeLabelsManager.NO_LABEL;
+            continue;
+          }
+
+          if (values.size() > 1) {
+            throwExceptionWithMetaInfo("Inside one targetExpression, we only "
+                + "support affinity to at most one node partition now");
+          }
+
+          nodePartition = values.iterator().next();
+        } else if (targetExpression.getTargetType().equals(
+            PlacementConstraint.TargetExpression.TargetType.ALLOCATION_TAG)) {
+          // Handle allocation tags
+          if (targetAllocationTags != null) {
+            // This means we have duplicated AllocationTag expressions entries
+            // inside placement constraint, which might be set by mistake.
+            throwExceptionWithMetaInfo(
+                "Only one AllocationTag targetExpression is allowed");
+          }
+
+          if (targetExpression.getTargetValues() == null ||
+              targetExpression.getTargetValues().isEmpty()) {
+            throwExceptionWithMetaInfo("Failed to find allocation tags from "
+                + "TargetExpressions or couldn't find self-app target.");
+          }
+
+          targetAllocationTags = new HashSet<>(
+              targetExpression.getTargetValues());
         }
+      }
 
-        targetAllocationTags = new HashSet<>(
-            targetExpression.getTargetValues());
+      if (targetAllocationTags == null) {
+        // That means we don't have ALLOCATION_TAG specified
+        throwExceptionWithMetaInfo(
+            "Couldn't find target expression with type == ALLOCATION_TAG,"
+                + " it is required to include one and only one target"
+                + " expression with type == ALLOCATION_TAG");
       }
     }
 
+    // If this scheduling request doesn't contain a placement constraint,
+    // we set allocation tags an empty set.
     if (targetAllocationTags == null) {
-      // That means we don't have ALLOCATION_TAG specified
-      throwExceptionWithMetaInfo(
-          "Couldn't find target expression with type == ALLOCATION_TAG, it is "
-              + "required to include one and only one target expression with "
-              + "type == ALLOCATION_TAG");
-
+      targetAllocationTags = ImmutableSet.of();
     }
 
     if (nodePartition == null) {

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

@@ -18,8 +18,15 @@
 
 package org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity;
 
+import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableSet;
 import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.yarn.api.protocolrecords.AllocateRequest;
+import org.apache.hadoop.yarn.api.records.ExecutionType;
+import org.apache.hadoop.yarn.api.records.ExecutionTypeRequest;
+import org.apache.hadoop.yarn.api.records.SchedulingRequest;
+import org.apache.hadoop.yarn.api.resource.PlacementConstraint;
+import org.apache.hadoop.yarn.api.resource.PlacementConstraints;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.constraint.TargetApplicationsNamespace;
 import org.apache.hadoop.yarn.api.records.Priority;
 import org.apache.hadoop.yarn.api.records.Resource;
@@ -39,6 +46,8 @@ import org.junit.Assert;
 import org.junit.Before;
 import org.junit.Test;
 
+import static org.apache.hadoop.yarn.api.resource.PlacementConstraints.PlacementTargets.*;
+
 public class TestSchedulingRequestContainerAllocation {
   private final int GB = 1024;
 
@@ -393,4 +402,79 @@ public class TestSchedulingRequestContainerAllocation {
     Assert.assertTrue(caughtException);
     rm1.close();
   }
+
+  @Test
+  public void testSchedulingRequestWithNullConstraint() throws Exception {
+    Configuration csConf = TestUtils.getConfigurationWithMultipleQueues(
+        new Configuration());
+    csConf.set(YarnConfiguration.RM_PLACEMENT_CONSTRAINTS_HANDLER,
+        YarnConfiguration.SCHEDULER_RM_PLACEMENT_CONSTRAINTS_HANDLER);
+
+    // inject node label manager
+    MockRM rm1 = new MockRM(csConf) {
+      @Override
+      public RMNodeLabelsManager createNodeLabelManager() {
+        return mgr;
+      }
+    };
+
+    rm1.getRMContext().setNodeLabelManager(mgr);
+    rm1.start();
+
+    // 4 NMs.
+    MockNM[] nms = new MockNM[4];
+    RMNode[] rmNodes = new RMNode[4];
+    for (int i = 0; i < 4; i++) {
+      nms[i] = rm1.registerNode("192.168.0." + i + ":1234", 10 * GB);
+      rmNodes[i] = rm1.getRMContext().getRMNodes().get(nms[i].getNodeId());
+    }
+
+    // app1 -> c
+    RMApp app1 = rm1.submitApp(1 * GB, "app", "user", null, "c");
+    MockAM am1 = MockRM.launchAndRegisterAM(app1, rm1, nms[0]);
+
+    CapacityScheduler cs = (CapacityScheduler) rm1.getResourceScheduler();
+
+    PlacementConstraint constraint = PlacementConstraints
+        .targetNotIn("node", allocationTag("t1"))
+        .build();
+    SchedulingRequest sc = SchedulingRequest
+        .newInstance(0, Priority.newInstance(1),
+            ExecutionTypeRequest.newInstance(ExecutionType.GUARANTEED),
+            ImmutableSet.of("t1"),
+            ResourceSizing.newInstance(1, Resource.newInstance(1024, 1)),
+            constraint);
+    AllocateRequest request = AllocateRequest.newBuilder()
+        .schedulingRequests(ImmutableList.of(sc)).build();
+    am1.allocate(request);
+
+    for (int i = 0; i < 4; i++) {
+      cs.handle(new NodeUpdateSchedulerEvent(rmNodes[i]));
+    }
+
+    FiCaSchedulerApp schedApp = cs.getApplicationAttempt(
+        am1.getApplicationAttemptId());
+    Assert.assertEquals(2, schedApp.getLiveContainers().size());
+
+
+    // Send another request with null placement constraint,
+    // ensure there is no NPE while handling this request.
+    sc = SchedulingRequest
+        .newInstance(1, Priority.newInstance(1),
+            ExecutionTypeRequest.newInstance(ExecutionType.GUARANTEED),
+            ImmutableSet.of("t2"),
+            ResourceSizing.newInstance(2, Resource.newInstance(1024, 1)),
+            null);
+    AllocateRequest request1 = AllocateRequest.newBuilder()
+        .schedulingRequests(ImmutableList.of(sc)).build();
+    am1.allocate(request1);
+
+    for (int i = 0; i < 4; i++) {
+      cs.handle(new NodeUpdateSchedulerEvent(rmNodes[i]));
+    }
+
+    Assert.assertEquals(4, schedApp.getLiveContainers().size());
+
+    rm1.close();
+  }
 }