diff --git a/azure-client-runtime/src/main/java/com/microsoft/azure/AzureServiceCall.java b/azure-client-runtime/src/main/java/com/microsoft/azure/AzureServiceCall.java
index e9c8728b67..c55c189cee 100644
--- a/azure-client-runtime/src/main/java/com/microsoft/azure/AzureServiceCall.java
+++ b/azure-client-runtime/src/main/java/com/microsoft/azure/AzureServiceCall.java
@@ -10,13 +10,12 @@
 import com.microsoft.rest.ServiceCall;
 import com.microsoft.rest.ServiceResponse;
 import com.microsoft.rest.ServiceResponseWithHeaders;
-
-import java.util.List;
-
 import rx.Observable;
 import rx.Subscriber;
 import rx.functions.Func1;
 
+import java.util.List;
+
 /**
  * An instance of this class provides access to the underlying REST call invocation.
  * This class wraps around the Retrofit Call object and allows updates to it in the
diff --git a/azure-client-runtime/src/main/java/com/microsoft/azure/TaskGroupBase.java b/azure-client-runtime/src/main/java/com/microsoft/azure/TaskGroupBase.java
index 747f0273fa..6de2a3ab46 100644
--- a/azure-client-runtime/src/main/java/com/microsoft/azure/TaskGroupBase.java
+++ b/azure-client-runtime/src/main/java/com/microsoft/azure/TaskGroupBase.java
@@ -64,18 +64,31 @@ public Observable<T> executeAsync() {
         final List<Observable<T>> observables = new ArrayList<>();
         while (nextNode != null) {
             final DAGNode<U> thisNode = nextNode;
-            observables.add(nextNode.data().executeAsync()
-                    .flatMap(new Func1<T, Observable<T>>() {
-                        @Override
-                        public Observable<T> call(T t) {
-                            dag().reportedCompleted(thisNode);
-                            if (dag().isRootNode(thisNode)) {
-                                return Observable.just(t);
-                            } else {
+            T cachedResult = nextNode.data().result();
+            if (cachedResult != null && !this.dag().isRootNode(nextNode)) {
+                observables.add(Observable.just(cachedResult)
+                        .flatMap(new Func1<T, Observable<T>>() {
+                            @Override
+                            public Observable<T> call(T t) {
+                                dag().reportedCompleted(thisNode);
                                 return executeAsync();
                             }
-                        }
-                    }));
+                        })
+                );
+            } else {
+                observables.add(nextNode.data().executeAsync()
+                        .flatMap(new Func1<T, Observable<T>>() {
+                            @Override
+                            public Observable<T> call(T t) {
+                                dag().reportedCompleted(thisNode);
+                                if (dag().isRootNode(thisNode)) {
+                                    return Observable.just(t);
+                                } else {
+                                    return executeAsync();
+                                }
+                            }
+                        }));
+            }
             nextNode = dag.getNext();
         }
         return Observable.merge(observables);
diff --git a/client-runtime/src/main/java/com/microsoft/rest/ServiceCall.java b/client-runtime/src/main/java/com/microsoft/rest/ServiceCall.java
index 949ef7b887..960a016b88 100644
--- a/client-runtime/src/main/java/com/microsoft/rest/ServiceCall.java
+++ b/client-runtime/src/main/java/com/microsoft/rest/ServiceCall.java
@@ -8,7 +8,6 @@
 package com.microsoft.rest;
 
 import com.google.common.util.concurrent.AbstractFuture;
-
 import rx.Observable;
 import rx.Subscription;
 import rx.functions.Action1;
@@ -130,6 +129,17 @@ protected void setSubscription(Subscription subscription) {
         this.subscription = subscription;
     }
 
+    /**
+     * Invoke this method to report completed, allowing
+     * {@link AbstractFuture#get()} to be unblocked.
+     *
+     * @param result the service response returned.
+     * @return true if successfully reported; false otherwise.
+     */
+    public boolean success(T result) {
+        return set(result);
+    }
+
     @Override
     public boolean cancel(boolean mayInterruptIfRunning) {
         subscription.unsubscribe();