YARN-6756. ContainerRequest#executionTypeRequest causes NPE. Contributed by Jian He

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/main/java/org/apache/hadoop/yarn/client/api/AMRMClient.java

@@ -122,9 +122,10 @@ public abstract class AMRMClient<T extends AMRMClient.ContainerRequest> extends
     private List<String> racks;
     private Priority priority;
     private long allocationRequestId;
-    private boolean relaxLocality;
+    private boolean relaxLocality = true;
     private String nodeLabelsExpression;
-    private ExecutionTypeRequest executionTypeRequest;
+    private ExecutionTypeRequest executionTypeRequest =
+        ExecutionTypeRequest.newInstance();
     
     /**
      * Instantiates a {@link ContainerRequest} with the given constraints and

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/test/java/org/apache/hadoop/yarn/client/api/impl/TestAMRMClientContainerRequest.java

@@ -51,8 +51,10 @@ public class TestAMRMClientContainerRequest {
 
     Resource capability = Resource.newInstance(1024, 1);
     ContainerRequest request =
-        new ContainerRequest(capability, new String[] {"host1", "host2"},
-            new String[] {"/rack2"}, Priority.newInstance(1));
+        ContainerRequest.newBuilder().capability(capability)
+            .nodes(new String[] { "host1", "host2" })
+            .racks(new String[] { "/rack2" }).priority(Priority.newInstance(1))
+            .build();
     client.addContainerRequest(request);
     verifyResourceRequest(client, request, "host1", true);
     verifyResourceRequest(client, request, "host2", true);