Merge "Return local shard's DataTree from ActorContext#findPrimaryShardAsync"
[controller.git] / opendaylight / md-sal / sal-distributed-datastore / src / test / java / org / opendaylight / controller / cluster / datastore / TransactionProxyTest.java
index 8278d3cffceaa6b82357c08c4ab62e33ff53fafe..844feb2f47e988b89498a80946d97aecbff8c049 100644 (file)
@@ -3,13 +3,13 @@ package org.opendaylight.controller.cluster.datastore;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;
 import static org.mockito.Matchers.any;
 import static org.mockito.Matchers.anyString;
 import static org.mockito.Matchers.eq;
 import static org.mockito.Matchers.isA;
 import static org.mockito.Mockito.doReturn;
-import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.verify;
 import static org.opendaylight.controller.cluster.datastore.TransactionProxy.TransactionType.READ_ONLY;
 import static org.opendaylight.controller.cluster.datastore.TransactionProxy.TransactionType.READ_WRITE;
@@ -20,40 +20,47 @@ import akka.actor.ActorSystem;
 import akka.actor.Props;
 import akka.dispatch.Futures;
 import com.google.common.base.Optional;
+import com.google.common.collect.Sets;
 import com.google.common.util.concurrent.CheckedFuture;
 import com.google.common.util.concurrent.FutureCallback;
 import com.google.common.util.concurrent.Uninterruptibles;
+import java.util.Collection;
 import java.util.List;
 import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.ExecutionException;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicReference;
 import org.junit.Assert;
 import org.junit.Test;
 import org.mockito.InOrder;
 import org.mockito.Mockito;
+import org.opendaylight.controller.cluster.datastore.TransactionProxy.TransactionType;
+import org.opendaylight.controller.cluster.datastore.exceptions.NoShardLeaderException;
+import org.opendaylight.controller.cluster.datastore.exceptions.NotInitializedException;
 import org.opendaylight.controller.cluster.datastore.exceptions.PrimaryNotFoundException;
 import org.opendaylight.controller.cluster.datastore.exceptions.TimeoutException;
 import org.opendaylight.controller.cluster.datastore.messages.BatchedModifications;
-import org.opendaylight.controller.cluster.datastore.messages.BatchedModificationsReply;
 import org.opendaylight.controller.cluster.datastore.messages.CloseTransaction;
+import org.opendaylight.controller.cluster.datastore.messages.CommitTransactionReply;
 import org.opendaylight.controller.cluster.datastore.messages.ReadyTransaction;
 import org.opendaylight.controller.cluster.datastore.modification.DeleteModification;
 import org.opendaylight.controller.cluster.datastore.modification.MergeModification;
 import org.opendaylight.controller.cluster.datastore.modification.WriteModification;
 import org.opendaylight.controller.cluster.datastore.shardstrategy.DefaultShardStrategy;
 import org.opendaylight.controller.cluster.datastore.utils.DoNothingActor;
+import org.opendaylight.controller.cluster.datastore.utils.NormalizedNodeAggregatorTest;
 import org.opendaylight.controller.md.cluster.datastore.model.CarsModel;
+import org.opendaylight.controller.md.cluster.datastore.model.SchemaContextHelper;
 import org.opendaylight.controller.md.cluster.datastore.model.TestModel;
 import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
 import org.opendaylight.controller.protobuff.messages.transaction.ShardTransactionMessages.CreateTransactionReply;
 import org.opendaylight.controller.sal.core.spi.data.DOMStoreThreePhaseCommitCohort;
 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
+import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNodes;
-import scala.concurrent.Await;
-import scala.concurrent.Future;
+import org.opendaylight.yangtools.yang.model.api.SchemaContext;
 import scala.concurrent.Promise;
-import scala.concurrent.duration.Duration;
 
 @SuppressWarnings("resource")
 public class TransactionProxyTest extends AbstractTransactionProxyTest {
@@ -123,7 +130,7 @@ public class TransactionProxyTest extends AbstractTransactionProxyTest {
         if (exToThrow instanceof PrimaryNotFoundException) {
             doReturn(Futures.failed(exToThrow)).when(mockActorContext).findPrimaryShardAsync(anyString());
         } else {
-            doReturn(Futures.successful(getSystem().actorSelection(actorRef.path()))).
+            doReturn(primaryShardInfoReply(getSystem(), actorRef)).
                     when(mockActorContext).findPrimaryShardAsync(anyString());
         }
 
@@ -160,34 +167,6 @@ public class TransactionProxyTest extends AbstractTransactionProxyTest {
         testReadWithExceptionOnInitialCreateTransaction(new TestException());
     }
 
-    @Test(expected = TestException.class)
-    public void testReadWithPriorRecordingOperationFailure() throws Throwable {
-        doReturn(dataStoreContextBuilder.shardBatchedModificationCount(2).build()).
-                when(mockActorContext).getDatastoreContext();
-
-        ActorRef actorRef = setupActorContextWithInitialCreateTransaction(getSystem(), READ_WRITE);
-
-        NormalizedNode<?, ?> nodeToWrite = ImmutableNodes.containerNode(TestModel.TEST_QNAME);
-
-        expectFailedBatchedModifications(actorRef);
-
-        doReturn(readSerializedDataReply(null)).when(mockActorContext).executeOperationAsync(
-                eq(actorSelection(actorRef)), eqSerializedReadData());
-
-        TransactionProxy transactionProxy = new TransactionProxy(mockActorContext, READ_WRITE);
-
-        transactionProxy.write(TestModel.TEST_PATH, nodeToWrite);
-
-        transactionProxy.delete(TestModel.TEST_PATH);
-
-        try {
-            propagateReadFailedExceptionCause(transactionProxy.read(TestModel.TEST_PATH));
-        } finally {
-            verify(mockActorContext, times(0)).executeOperationAsync(
-                    eq(actorSelection(actorRef)), eqSerializedReadData());
-        }
-    }
-
     @Test
     public void testReadWithPriorRecordingOperationSuccessful() throws Throwable {
         ActorRef actorRef = setupActorContextWithInitialCreateTransaction(getSystem(), READ_WRITE);
@@ -230,7 +209,7 @@ public class TransactionProxyTest extends AbstractTransactionProxyTest {
         doReturn(getSystem().actorSelection(actorRef.path())).when(mockActorContext).
             actorSelection(actorRef.path().toString());
 
-        doReturn(Futures.successful(getSystem().actorSelection(actorRef.path()))).
+        doReturn(primaryShardInfoReply(getSystem(), actorRef)).
             when(mockActorContext).findPrimaryShardAsync(eq(DefaultShardStrategy.DEFAULT_SHARD));
 
         doReturn(Futures.successful(new Object())).when(mockActorContext).executeOperationAsync(
@@ -297,35 +276,6 @@ public class TransactionProxyTest extends AbstractTransactionProxyTest {
         propagateReadFailedExceptionCause(transactionProxy.exists(TestModel.TEST_PATH));
     }
 
-    @Test(expected = TestException.class)
-    public void testExistsWithPriorRecordingOperationFailure() throws Throwable {
-        doReturn(dataStoreContextBuilder.shardBatchedModificationCount(2).build()).
-                when(mockActorContext).getDatastoreContext();
-
-        ActorRef actorRef = setupActorContextWithInitialCreateTransaction(getSystem(), READ_WRITE);
-
-        NormalizedNode<?, ?> nodeToWrite = ImmutableNodes.containerNode(TestModel.TEST_QNAME);
-
-        expectFailedBatchedModifications(actorRef);
-
-        doReturn(dataExistsSerializedReply(false)).when(mockActorContext).executeOperationAsync(
-                eq(actorSelection(actorRef)), eqSerializedDataExists());
-
-        TransactionProxy transactionProxy = new TransactionProxy(mockActorContext,
-                READ_WRITE);
-
-        transactionProxy.write(TestModel.TEST_PATH, nodeToWrite);
-
-        transactionProxy.delete(TestModel.TEST_PATH);
-
-        try {
-            propagateReadFailedExceptionCause(transactionProxy.exists(TestModel.TEST_PATH));
-        } finally {
-            verify(mockActorContext, times(0)).executeOperationAsync(
-                    eq(actorSelection(actorRef)), eqSerializedDataExists());
-        }
-    }
-
     @Test
     public void testExistsWithPriorRecordingOperationSuccessful() throws Throwable {
         ActorRef actorRef = setupActorContextWithInitialCreateTransaction(getSystem(), READ_WRITE);
@@ -359,54 +309,25 @@ public class TransactionProxyTest extends AbstractTransactionProxyTest {
         transactionProxy.exists(TestModel.TEST_PATH);
     }
 
-    private void verifyRecordingOperationFutures(List<Future<Object>> futures,
-            Class<?>... expResultTypes) throws Exception {
-        assertEquals("getRecordingOperationFutures size", expResultTypes.length, futures.size());
-
-        int i = 0;
-        for( Future<Object> future: futures) {
-            assertNotNull("Recording operation Future is null", future);
-
-            Class<?> expResultType = expResultTypes[i++];
-            if(Throwable.class.isAssignableFrom(expResultType)) {
-                try {
-                    Await.result(future, Duration.create(5, TimeUnit.SECONDS));
-                    fail("Expected exception from recording operation Future");
-                } catch(Exception e) {
-                    // Expected
-                }
-            } else {
-                assertEquals(String.format("Recording operation %d Future result type", i +1 ), expResultType,
-                             Await.result(future, Duration.create(5, TimeUnit.SECONDS)).getClass());
-            }
-        }
-    }
-
     @Test
     public void testWrite() throws Exception {
+        dataStoreContextBuilder.shardBatchedModificationCount(1);
         ActorRef actorRef = setupActorContextWithInitialCreateTransaction(getSystem(), WRITE_ONLY);
 
         NormalizedNode<?, ?> nodeToWrite = ImmutableNodes.containerNode(TestModel.TEST_QNAME);
 
         expectBatchedModifications(actorRef, 1);
-        expectReadyTransaction(actorRef);
 
         TransactionProxy transactionProxy = new TransactionProxy(mockActorContext, WRITE_ONLY);
 
         transactionProxy.write(TestModel.TEST_PATH, nodeToWrite);
 
-        // This sends the batched modification.
-        transactionProxy.ready();
-
-        verifyOneBatchedModification(actorRef, new WriteModification(TestModel.TEST_PATH, nodeToWrite));
-
-        verifyRecordingOperationFutures(transactionProxy.getRecordedOperationFutures(),
-                BatchedModificationsReply.class);
+        verifyOneBatchedModification(actorRef, new WriteModification(TestModel.TEST_PATH, nodeToWrite), false);
     }
 
     @Test
     public void testWriteAfterAsyncRead() throws Throwable {
-        ActorRef actorRef = setupActorContextWithoutInitialCreateTransaction(getSystem());
+        ActorRef actorRef = setupActorContextWithoutInitialCreateTransaction(getSystem(), DefaultShardStrategy.DEFAULT_SHARD);
 
         Promise<Object> createTxPromise = akka.dispatch.Futures.promise();
         doReturn(createTxPromise).when(mockActorContext).executeOperationAsync(
@@ -416,8 +337,7 @@ public class TransactionProxyTest extends AbstractTransactionProxyTest {
         doReturn(readSerializedDataReply(null)).when(mockActorContext).executeOperationAsync(
                 eq(actorSelection(actorRef)), eqSerializedReadData());
 
-        expectBatchedModifications(actorRef, 1);
-        expectReadyTransaction(actorRef);
+        expectBatchedModificationsReady(actorRef);
 
         final NormalizedNode<?, ?> nodeToWrite = ImmutableNodes.containerNode(TestModel.TEST_QNAME);
 
@@ -456,10 +376,7 @@ public class TransactionProxyTest extends AbstractTransactionProxyTest {
         // This sends the batched modification.
         transactionProxy.ready();
 
-        verifyOneBatchedModification(actorRef, new WriteModification(TestModel.TEST_PATH, nodeToWrite));
-
-        verifyRecordingOperationFutures(transactionProxy.getRecordedOperationFutures(),
-                BatchedModificationsReply.class);
+        verifyOneBatchedModification(actorRef, new WriteModification(TestModel.TEST_PATH, nodeToWrite), true);
     }
 
     @Test(expected=IllegalStateException.class)
@@ -479,48 +396,64 @@ public class TransactionProxyTest extends AbstractTransactionProxyTest {
 
     @Test
     public void testMerge() throws Exception {
+        dataStoreContextBuilder.shardBatchedModificationCount(1);
         ActorRef actorRef = setupActorContextWithInitialCreateTransaction(getSystem(), WRITE_ONLY);
 
         NormalizedNode<?, ?> nodeToWrite = ImmutableNodes.containerNode(TestModel.TEST_QNAME);
 
         expectBatchedModifications(actorRef, 1);
-        expectReadyTransaction(actorRef);
 
         TransactionProxy transactionProxy = new TransactionProxy(mockActorContext, WRITE_ONLY);
 
         transactionProxy.merge(TestModel.TEST_PATH, nodeToWrite);
 
-        // This sends the batched modification.
-        transactionProxy.ready();
-
-        verifyOneBatchedModification(actorRef, new MergeModification(TestModel.TEST_PATH, nodeToWrite));
-
-        verifyRecordingOperationFutures(transactionProxy.getRecordedOperationFutures(),
-                BatchedModificationsReply.class);
+        verifyOneBatchedModification(actorRef, new MergeModification(TestModel.TEST_PATH, nodeToWrite), false);
     }
 
     @Test
     public void testDelete() throws Exception {
+        dataStoreContextBuilder.shardBatchedModificationCount(1);
         ActorRef actorRef = setupActorContextWithInitialCreateTransaction(getSystem(), WRITE_ONLY);
 
         expectBatchedModifications(actorRef, 1);
-        expectReadyTransaction(actorRef);
 
         TransactionProxy transactionProxy = new TransactionProxy(mockActorContext, WRITE_ONLY);
 
         transactionProxy.delete(TestModel.TEST_PATH);
 
-        // This sends the batched modification.
-        transactionProxy.ready();
+        verifyOneBatchedModification(actorRef, new DeleteModification(TestModel.TEST_PATH), false);
+    }
+
+    @Test
+    public void testReadWrite() throws Exception {
+        ActorRef actorRef = setupActorContextWithInitialCreateTransaction(getSystem(), READ_WRITE);
+
+        NormalizedNode<?, ?> nodeToWrite = ImmutableNodes.containerNode(TestModel.TEST_QNAME);
+
+        doReturn(readSerializedDataReply(null)).when(mockActorContext).executeOperationAsync(
+                eq(actorSelection(actorRef)), eqSerializedReadData());
 
-        verifyOneBatchedModification(actorRef, new DeleteModification(TestModel.TEST_PATH));
+        expectBatchedModifications(actorRef, 1);
+
+        TransactionProxy transactionProxy = new TransactionProxy(mockActorContext, READ_WRITE);
+
+        transactionProxy.read(TestModel.TEST_PATH);
+
+        transactionProxy.write(TestModel.TEST_PATH, nodeToWrite);
+
+        transactionProxy.read(TestModel.TEST_PATH);
 
-        verifyRecordingOperationFutures(transactionProxy.getRecordedOperationFutures(),
-                BatchedModificationsReply.class);
+        transactionProxy.read(TestModel.TEST_PATH);
+
+        List<BatchedModifications> batchedModifications = captureBatchedModifications(actorRef);
+        assertEquals("Captured BatchedModifications count", 1, batchedModifications.size());
+
+        verifyBatchedModifications(batchedModifications.get(0), false,
+                new WriteModification(TestModel.TEST_PATH, nodeToWrite));
     }
 
     @Test
-    public void testReady() throws Exception {
+    public void testReadyWithReadWrite() throws Exception {
         ActorRef actorRef = setupActorContextWithInitialCreateTransaction(getSystem(), READ_WRITE);
 
         NormalizedNode<?, ?> nodeToWrite = ImmutableNodes.containerNode(TestModel.TEST_QNAME);
@@ -528,8 +461,7 @@ public class TransactionProxyTest extends AbstractTransactionProxyTest {
         doReturn(readSerializedDataReply(null)).when(mockActorContext).executeOperationAsync(
                 eq(actorSelection(actorRef)), eqSerializedReadData());
 
-        expectBatchedModifications(actorRef, 1);
-        expectReadyTransaction(actorRef);
+        expectBatchedModificationsReady(actorRef, true);
 
         TransactionProxy transactionProxy = new TransactionProxy(mockActorContext, READ_WRITE);
 
@@ -539,133 +471,206 @@ public class TransactionProxyTest extends AbstractTransactionProxyTest {
 
         DOMStoreThreePhaseCommitCohort ready = transactionProxy.ready();
 
-        assertTrue(ready instanceof ThreePhaseCommitCohortProxy);
+        assertTrue(ready instanceof SingleCommitCohortProxy);
 
-        ThreePhaseCommitCohortProxy proxy = (ThreePhaseCommitCohortProxy) ready;
+        verifyCohortFutures((SingleCommitCohortProxy)ready, new CommitTransactionReply().toSerializable());
 
-        verifyRecordingOperationFutures(transactionProxy.getRecordedOperationFutures(),
-                BatchedModificationsReply.class);
+        List<BatchedModifications> batchedModifications = captureBatchedModifications(actorRef);
+        assertEquals("Captured BatchedModifications count", 1, batchedModifications.size());
 
-        verifyCohortFutures(proxy, getSystem().actorSelection(actorRef.path()));
+        verifyBatchedModifications(batchedModifications.get(0), true, true,
+                new WriteModification(TestModel.TEST_PATH, nodeToWrite));
 
-        verify(mockActorContext).executeOperationAsync(eq(actorSelection(actorRef)),
-                isA(BatchedModifications.class));
+        assertEquals("getTotalMessageCount", 1, batchedModifications.get(0).getTotalMessagesSent());
     }
 
     @Test
-    public void testReadyWithRecordingOperationFailure() throws Exception {
-        ActorRef actorRef = setupActorContextWithInitialCreateTransaction(getSystem(), WRITE_ONLY);
+    public void testReadyWithNoModifications() throws Exception {
+        ActorRef actorRef = setupActorContextWithInitialCreateTransaction(getSystem(), READ_WRITE);
 
-        NormalizedNode<?, ?> nodeToWrite = ImmutableNodes.containerNode(TestModel.TEST_QNAME);
+        doReturn(readSerializedDataReply(null)).when(mockActorContext).executeOperationAsync(
+                eq(actorSelection(actorRef)), eqSerializedReadData());
 
-        expectFailedBatchedModifications(actorRef);
+        expectBatchedModificationsReady(actorRef, true);
+
+        TransactionProxy transactionProxy = new TransactionProxy(mockActorContext, READ_WRITE);
+
+        transactionProxy.read(TestModel.TEST_PATH);
+
+        DOMStoreThreePhaseCommitCohort ready = transactionProxy.ready();
+
+        assertTrue(ready instanceof SingleCommitCohortProxy);
 
-        expectReadyTransaction(actorRef);
+        verifyCohortFutures((SingleCommitCohortProxy)ready, new CommitTransactionReply().toSerializable());
 
-        doReturn(false).when(mockActorContext).isPathLocal(actorRef.path().toString());
+        List<BatchedModifications> batchedModifications = captureBatchedModifications(actorRef);
+        assertEquals("Captured BatchedModifications count", 1, batchedModifications.size());
+
+        verifyBatchedModifications(batchedModifications.get(0), true, true);
+    }
+
+    @Test
+    public void testReadyWithMultipleShardWrites() throws Exception {
+        ActorRef actorRef1 = setupActorContextWithInitialCreateTransaction(getSystem(), WRITE_ONLY);
+
+        ActorRef actorRef2 = setupActorContextWithInitialCreateTransaction(getSystem(), WRITE_ONLY, "junk");
+
+        expectBatchedModificationsReady(actorRef1);
+        expectBatchedModificationsReady(actorRef2);
 
         TransactionProxy transactionProxy = new TransactionProxy(mockActorContext, WRITE_ONLY);
 
-        transactionProxy.write(TestModel.TEST_PATH, nodeToWrite);
+        transactionProxy.write(TestModel.JUNK_PATH, ImmutableNodes.containerNode(TestModel.JUNK_QNAME));
+        transactionProxy.write(TestModel.TEST_PATH, ImmutableNodes.containerNode(TestModel.TEST_QNAME));
 
         DOMStoreThreePhaseCommitCohort ready = transactionProxy.ready();
 
         assertTrue(ready instanceof ThreePhaseCommitCohortProxy);
 
-        ThreePhaseCommitCohortProxy proxy = (ThreePhaseCommitCohortProxy) ready;
-
-        verifyCohortFutures(proxy, TestException.class);
-
-        verifyRecordingOperationFutures(transactionProxy.getRecordedOperationFutures(), TestException.class);
+        verifyCohortFutures((ThreePhaseCommitCohortProxy)ready, actorSelection(actorRef1),
+                actorSelection(actorRef2));
     }
 
     @Test
-    public void testReadyWithReplyFailure() throws Exception {
+    public void testReadyWithWriteOnlyAndLastBatchPending() throws Exception {
+        dataStoreContextBuilder.writeOnlyTransactionOptimizationsEnabled(true);
+
         ActorRef actorRef = setupActorContextWithInitialCreateTransaction(getSystem(), WRITE_ONLY);
 
         NormalizedNode<?, ?> nodeToWrite = ImmutableNodes.containerNode(TestModel.TEST_QNAME);
 
-        expectBatchedModifications(actorRef, 1);
-
-        doReturn(Futures.failed(new TestException())).when(mockActorContext).
-                executeOperationAsync(eq(actorSelection(actorRef)),
-                        isA(ReadyTransaction.SERIALIZABLE_CLASS));
+        expectBatchedModificationsReady(actorRef, true);
 
         TransactionProxy transactionProxy = new TransactionProxy(mockActorContext, WRITE_ONLY);
 
-        transactionProxy.merge(TestModel.TEST_PATH, nodeToWrite);
+        transactionProxy.write(TestModel.TEST_PATH, nodeToWrite);
 
         DOMStoreThreePhaseCommitCohort ready = transactionProxy.ready();
 
-        assertTrue(ready instanceof ThreePhaseCommitCohortProxy);
+        assertTrue(ready instanceof SingleCommitCohortProxy);
+
+        verifyCohortFutures((SingleCommitCohortProxy)ready, new CommitTransactionReply().toSerializable());
 
-        ThreePhaseCommitCohortProxy proxy = (ThreePhaseCommitCohortProxy) ready;
+        List<BatchedModifications> batchedModifications = captureBatchedModifications(actorRef);
+        assertEquals("Captured BatchedModifications count", 1, batchedModifications.size());
 
-        verifyRecordingOperationFutures(transactionProxy.getRecordedOperationFutures(),
-                BatchedModificationsReply.class);
+        verifyBatchedModifications(batchedModifications.get(0), true, true,
+                new WriteModification(TestModel.TEST_PATH, nodeToWrite));
 
-        verifyCohortFutures(proxy, TestException.class);
+        verify(mockActorContext, never()).executeOperationAsync(eq(actorSelection(actorRef)),
+                isA(ReadyTransaction.SERIALIZABLE_CLASS));
     }
 
     @Test
-    public void testReadyWithInitialCreateTransactionFailure() throws Exception {
+    public void testReadyWithWriteOnlyAndLastBatchEmpty() throws Exception {
+        dataStoreContextBuilder.shardBatchedModificationCount(1).writeOnlyTransactionOptimizationsEnabled(true);
+        ActorRef actorRef = setupActorContextWithInitialCreateTransaction(getSystem(), WRITE_ONLY);
+
+        NormalizedNode<?, ?> nodeToWrite = ImmutableNodes.containerNode(TestModel.TEST_QNAME);
 
-        doReturn(Futures.failed(new PrimaryNotFoundException("mock"))).when(
-                mockActorContext).findPrimaryShardAsync(anyString());
+        expectBatchedModificationsReady(actorRef, true);
 
         TransactionProxy transactionProxy = new TransactionProxy(mockActorContext, WRITE_ONLY);
 
-        NormalizedNode<?, ?> nodeToWrite = ImmutableNodes.containerNode(TestModel.TEST_QNAME);
+        transactionProxy.write(TestModel.TEST_PATH, nodeToWrite);
 
-        transactionProxy.merge(TestModel.TEST_PATH, nodeToWrite);
+        DOMStoreThreePhaseCommitCohort ready = transactionProxy.ready();
 
-        transactionProxy.write(TestModel.TEST_PATH, nodeToWrite);
+        assertTrue(ready instanceof SingleCommitCohortProxy);
 
-        transactionProxy.delete(TestModel.TEST_PATH);
+        verifyCohortFutures((SingleCommitCohortProxy)ready, new CommitTransactionReply().toSerializable());
 
-        DOMStoreThreePhaseCommitCohort ready = transactionProxy.ready();
+        List<BatchedModifications> batchedModifications = captureBatchedModifications(actorRef);
+        assertEquals("Captured BatchedModifications count", 2, batchedModifications.size());
 
-        assertTrue(ready instanceof ThreePhaseCommitCohortProxy);
+        verifyBatchedModifications(batchedModifications.get(0), false,
+                new WriteModification(TestModel.TEST_PATH, nodeToWrite));
 
-        ThreePhaseCommitCohortProxy proxy = (ThreePhaseCommitCohortProxy) ready;
+        verifyBatchedModifications(batchedModifications.get(1), true, true);
 
-        verifyCohortFutures(proxy, PrimaryNotFoundException.class);
+        verify(mockActorContext, never()).executeOperationAsync(eq(actorSelection(actorRef)),
+                isA(ReadyTransaction.SERIALIZABLE_CLASS));
     }
 
     @Test
-    public void testReadyWithInvalidReplyMessageType() throws Exception {
+    public void testReadyWithReplyFailure() throws Exception {
+        dataStoreContextBuilder.writeOnlyTransactionOptimizationsEnabled(true);
+
         ActorRef actorRef = setupActorContextWithInitialCreateTransaction(getSystem(), WRITE_ONLY);
 
         NormalizedNode<?, ?> nodeToWrite = ImmutableNodes.containerNode(TestModel.TEST_QNAME);
 
-        expectBatchedModifications(actorRef, 1);
+        expectFailedBatchedModifications(actorRef);
 
-        doReturn(Futures.successful(new Object())).when(mockActorContext).
-                executeOperationAsync(eq(actorSelection(actorRef)),
-                        isA(ReadyTransaction.SERIALIZABLE_CLASS));
+        TransactionProxy transactionProxy = new TransactionProxy(mockActorContext, WRITE_ONLY);
+
+        transactionProxy.merge(TestModel.TEST_PATH, nodeToWrite);
+
+        DOMStoreThreePhaseCommitCohort ready = transactionProxy.ready();
+
+        assertTrue(ready instanceof SingleCommitCohortProxy);
+
+        verifyCohortFutures((SingleCommitCohortProxy)ready, TestException.class);
+    }
+
+    private void testWriteOnlyTxWithFindPrimaryShardFailure(Exception toThrow) throws Exception {
+        doReturn(Futures.failed(toThrow)).when(mockActorContext).findPrimaryShardAsync(anyString());
 
         TransactionProxy transactionProxy = new TransactionProxy(mockActorContext, WRITE_ONLY);
 
+        NormalizedNode<?, ?> nodeToWrite = ImmutableNodes.containerNode(TestModel.TEST_QNAME);
+
+        transactionProxy.merge(TestModel.TEST_PATH, nodeToWrite);
+
         transactionProxy.write(TestModel.TEST_PATH, nodeToWrite);
 
+        transactionProxy.delete(TestModel.TEST_PATH);
+
         DOMStoreThreePhaseCommitCohort ready = transactionProxy.ready();
 
-        assertTrue(ready instanceof ThreePhaseCommitCohortProxy);
+        assertTrue(ready instanceof SingleCommitCohortProxy);
+
+        verifyCohortFutures((SingleCommitCohortProxy)ready, toThrow.getClass());
+    }
 
-        ThreePhaseCommitCohortProxy proxy = (ThreePhaseCommitCohortProxy) ready;
+    @Test
+    public void testWriteOnlyTxWithPrimaryNotFoundException() throws Exception {
+        testWriteOnlyTxWithFindPrimaryShardFailure(new PrimaryNotFoundException("mock"));
+    }
 
-        verifyCohortFutures(proxy, IllegalArgumentException.class);
+    @Test
+    public void testWriteOnlyTxWithNotInitializedException() throws Exception {
+        testWriteOnlyTxWithFindPrimaryShardFailure(new NotInitializedException("mock"));
     }
 
     @Test
-    public void testUnusedTransaction() throws Exception {
-        TransactionProxy transactionProxy = new TransactionProxy(mockActorContext, READ_WRITE);
+    public void testWriteOnlyTxWithNoShardLeaderException() throws Exception {
+        testWriteOnlyTxWithFindPrimaryShardFailure(new NoShardLeaderException("mock"));
+    }
+
+    @Test
+    public void testReadyWithInvalidReplyMessageType() throws Exception {
+        dataStoreContextBuilder.writeOnlyTransactionOptimizationsEnabled(true);
+        ActorRef actorRef1 = setupActorContextWithInitialCreateTransaction(getSystem(), WRITE_ONLY);
+
+        ActorRef actorRef2 = setupActorContextWithInitialCreateTransaction(getSystem(), WRITE_ONLY, "junk");
+
+        doReturn(Futures.successful(new Object())).when(mockActorContext).
+                executeOperationAsync(eq(actorSelection(actorRef1)), isA(BatchedModifications.class));
+
+        expectBatchedModificationsReady(actorRef2);
+
+        TransactionProxy transactionProxy = new TransactionProxy(mockActorContext, WRITE_ONLY);
+
+        transactionProxy.write(TestModel.JUNK_PATH, ImmutableNodes.containerNode(TestModel.JUNK_QNAME));
+        transactionProxy.write(TestModel.TEST_PATH, ImmutableNodes.containerNode(TestModel.TEST_QNAME));
 
         DOMStoreThreePhaseCommitCohort ready = transactionProxy.ready();
 
-        assertEquals("canCommit", true, ready.canCommit().get());
-        ready.preCommit().get();
-        ready.commit().get();
+        assertTrue(ready instanceof ThreePhaseCommitCohortProxy);
+
+        verifyCohortFutures((ThreePhaseCommitCohortProxy)ready, actorSelection(actorRef2),
+                IllegalArgumentException.class);
     }
 
     @Test
@@ -711,24 +716,8 @@ public class TransactionProxyTest extends AbstractTransactionProxyTest {
      */
     @Test
     public void testLocalTxActorRead() throws Exception {
-        ActorSystem actorSystem = getSystem();
-        ActorRef shardActorRef = actorSystem.actorOf(Props.create(DoNothingActor.class));
-
-        doReturn(actorSystem.actorSelection(shardActorRef.path())).
-            when(mockActorContext).actorSelection(shardActorRef.path().toString());
-
-        doReturn(Futures.successful(actorSystem.actorSelection(shardActorRef.path()))).
-            when(mockActorContext).findPrimaryShardAsync(eq(DefaultShardStrategy.DEFAULT_SHARD));
-
-        String actorPath = "akka.tcp://system@127.0.0.1:2550/user/tx-actor";
-        CreateTransactionReply createTransactionReply = CreateTransactionReply.newBuilder()
-            .setTransactionId("txn-1").setTransactionActorPath(actorPath).build();
-
-        doReturn(Futures.successful(createTransactionReply)).when(mockActorContext).
-            executeOperationAsync(eq(actorSystem.actorSelection(shardActorRef.path())),
-                eqCreateTransaction(memberName, READ_ONLY));
-
-        doReturn(true).when(mockActorContext).isPathLocal(actorPath);
+        setupActorContextWithInitialCreateTransaction(getSystem(), READ_ONLY);
+        doReturn(true).when(mockActorContext).isPathLocal(anyString());
 
         TransactionProxy transactionProxy = new TransactionProxy(mockActorContext,READ_ONLY);
 
@@ -764,48 +753,21 @@ public class TransactionProxyTest extends AbstractTransactionProxyTest {
 
     @Test
     public void testLocalTxActorReady() throws Exception {
-        ActorSystem actorSystem = getSystem();
-        ActorRef shardActorRef = actorSystem.actorOf(Props.create(DoNothingActor.class));
-
-        doReturn(actorSystem.actorSelection(shardActorRef.path())).
-            when(mockActorContext).actorSelection(shardActorRef.path().toString());
-
-        doReturn(Futures.successful(actorSystem.actorSelection(shardActorRef.path()))).
-            when(mockActorContext).findPrimaryShardAsync(eq(DefaultShardStrategy.DEFAULT_SHARD));
-
-        String actorPath = "akka.tcp://system@127.0.0.1:2550/user/tx-actor";
-        CreateTransactionReply createTransactionReply = CreateTransactionReply.newBuilder().
-            setTransactionId("txn-1").setTransactionActorPath(actorPath).
-            setMessageVersion(DataStoreVersions.CURRENT_VERSION).build();
-
-        doReturn(Futures.successful(createTransactionReply)).when(mockActorContext).
-            executeOperationAsync(eq(actorSystem.actorSelection(shardActorRef.path())),
-                eqCreateTransaction(memberName, WRITE_ONLY));
-
-        doReturn(true).when(mockActorContext).isPathLocal(actorPath);
+        ActorRef actorRef = setupActorContextWithInitialCreateTransaction(getSystem(), READ_WRITE);
+        doReturn(true).when(mockActorContext).isPathLocal(anyString());
 
-        doReturn(batchedModificationsReply(1)).when(mockActorContext).executeOperationAsync(
-                any(ActorSelection.class), isA(BatchedModifications.class));
+        expectBatchedModificationsReady(actorRef, true);
 
-        TransactionProxy transactionProxy = new TransactionProxy(mockActorContext, WRITE_ONLY);
+        TransactionProxy transactionProxy = new TransactionProxy(mockActorContext, READ_WRITE);
 
         NormalizedNode<?, ?> nodeToWrite = ImmutableNodes.containerNode(TestModel.TEST_QNAME);
         transactionProxy.write(TestModel.TEST_PATH, nodeToWrite);
 
-        verifyRecordingOperationFutures(transactionProxy.getRecordedOperationFutures(),
-                BatchedModificationsReply.class);
-
-        // testing ready
-        doReturn(readyTxReply(shardActorRef.path().toString())).when(mockActorContext).executeOperationAsync(
-            any(ActorSelection.class), isA(ReadyTransaction.class));
-
         DOMStoreThreePhaseCommitCohort ready = transactionProxy.ready();
 
-        assertTrue(ready instanceof ThreePhaseCommitCohortProxy);
-
-        ThreePhaseCommitCohortProxy proxy = (ThreePhaseCommitCohortProxy) ready;
+        assertTrue(ready instanceof SingleCommitCohortProxy);
 
-        verifyCohortFutures(proxy, getSystem().actorSelection(shardActorRef.path()));
+        verifyCohortFutures((SingleCommitCohortProxy)ready, new CommitTransactionReply().toSerializable());
     }
 
     private static interface TransactionProxyOperation {
@@ -872,23 +834,26 @@ public class TransactionProxyTest extends AbstractTransactionProxyTest {
                 when(mockActorContext).actorSelection(shardActorRef.path().toString());
 
         if(shardFound) {
-            doReturn(Futures.successful(actorSystem.actorSelection(shardActorRef.path()))).
+            doReturn(primaryShardInfoReply(actorSystem, shardActorRef)).
                     when(mockActorContext).findPrimaryShardAsync(eq(DefaultShardStrategy.DEFAULT_SHARD));
         } else {
-            doReturn(Futures.failed(new Exception("not found")))
+            doReturn(Futures.failed(new PrimaryNotFoundException("test")))
                     .when(mockActorContext).findPrimaryShardAsync(eq(DefaultShardStrategy.DEFAULT_SHARD));
         }
 
-        String actorPath = "akka.tcp://system@127.0.0.1:2550/user/tx-actor";
+        ActorRef txActorRef = actorSystem.actorOf(Props.create(DoNothingActor.class));
+        String actorPath = txActorRef.path().toString();
         CreateTransactionReply createTransactionReply = CreateTransactionReply.newBuilder().
                 setTransactionId("txn-1").setTransactionActorPath(actorPath).
                 setMessageVersion(DataStoreVersions.CURRENT_VERSION).build();
 
+        doReturn(actorSystem.actorSelection(actorPath)).when(mockActorContext).actorSelection(actorPath);
+
         doReturn(Futures.successful(createTransactionReply)).when(mockActorContext).
                 executeOperationAsync(eq(actorSystem.actorSelection(shardActorRef.path())),
                         eqCreateTransaction(memberName, READ_WRITE));
 
-        doReturn(true).when(mockActorContext).isPathLocal(actorPath);
+        doReturn(true).when(mockActorContext).isPathLocal(anyString());
 
         TransactionProxy transactionProxy = new TransactionProxy(mockActorContext, READ_WRITE);
 
@@ -921,6 +886,7 @@ public class TransactionProxyTest extends AbstractTransactionProxyTest {
 
     @Test
     public void testWriteThrottlingWhenShardFound(){
+        dataStoreContextBuilder.shardBatchedModificationCount(1);
         throttleOperation(new TransactionProxyOperation() {
             @Override
             public void run(TransactionProxy transactionProxy) {
@@ -938,6 +904,7 @@ public class TransactionProxyTest extends AbstractTransactionProxyTest {
     @Test
     public void testWriteThrottlingWhenShardNotFound(){
         // Confirm that there is no throttling when the Shard is not found
+        dataStoreContextBuilder.shardBatchedModificationCount(1);
         completeOperation(new TransactionProxyOperation() {
             @Override
             public void run(TransactionProxy transactionProxy) {
@@ -956,6 +923,7 @@ public class TransactionProxyTest extends AbstractTransactionProxyTest {
 
     @Test
     public void testWriteCompletion(){
+        dataStoreContextBuilder.shardBatchedModificationCount(1);
         completeOperation(new TransactionProxyOperation() {
             @Override
             public void run(TransactionProxy transactionProxy) {
@@ -972,7 +940,7 @@ public class TransactionProxyTest extends AbstractTransactionProxyTest {
 
     @Test
     public void testMergeThrottlingWhenShardFound(){
-
+        dataStoreContextBuilder.shardBatchedModificationCount(1);
         throttleOperation(new TransactionProxyOperation() {
             @Override
             public void run(TransactionProxy transactionProxy) {
@@ -989,7 +957,7 @@ public class TransactionProxyTest extends AbstractTransactionProxyTest {
 
     @Test
     public void testMergeThrottlingWhenShardNotFound(){
-
+        dataStoreContextBuilder.shardBatchedModificationCount(1);
         completeOperation(new TransactionProxyOperation() {
             @Override
             public void run(TransactionProxy transactionProxy) {
@@ -1006,6 +974,7 @@ public class TransactionProxyTest extends AbstractTransactionProxyTest {
 
     @Test
     public void testMergeCompletion(){
+        dataStoreContextBuilder.shardBatchedModificationCount(1);
         completeOperation(new TransactionProxyOperation() {
             @Override
             public void run(TransactionProxy transactionProxy) {
@@ -1054,6 +1023,7 @@ public class TransactionProxyTest extends AbstractTransactionProxyTest {
 
     @Test
     public void testDeleteCompletion(){
+        dataStoreContextBuilder.shardBatchedModificationCount(1);
         completeOperation(new TransactionProxyOperation() {
             @Override
             public void run(TransactionProxy transactionProxy) {
@@ -1210,18 +1180,14 @@ public class TransactionProxyTest extends AbstractTransactionProxyTest {
         }, 2, true);
     }
 
-    @Test
-    public void testModificationOperationBatching() throws Throwable {
+    private void testModificationOperationBatching(TransactionType type) throws Exception {
         int shardBatchedModificationCount = 3;
-        doReturn(dataStoreContextBuilder.shardBatchedModificationCount(shardBatchedModificationCount).build()).
-                when(mockActorContext).getDatastoreContext();
+        dataStoreContextBuilder.shardBatchedModificationCount(shardBatchedModificationCount);
 
-        ActorRef actorRef = setupActorContextWithInitialCreateTransaction(getSystem(), READ_WRITE);
+        ActorRef actorRef = setupActorContextWithInitialCreateTransaction(getSystem(), type);
 
         expectBatchedModifications(actorRef, shardBatchedModificationCount);
 
-        expectReadyTransaction(actorRef);
-
         YangInstanceIdentifier writePath1 = TestModel.TEST_PATH;
         NormalizedNode<?, ?> writeNode1 = ImmutableNodes.containerNode(TestModel.TEST_QNAME);
 
@@ -1243,7 +1209,7 @@ public class TransactionProxyTest extends AbstractTransactionProxyTest {
         YangInstanceIdentifier deletePath1 = TestModel.TEST_PATH;
         YangInstanceIdentifier deletePath2 = TestModel.OUTER_LIST_PATH;
 
-        TransactionProxy transactionProxy = new TransactionProxy(mockActorContext, READ_WRITE);
+        TransactionProxy transactionProxy = new TransactionProxy(mockActorContext, type);
 
         transactionProxy.write(writePath1, writeNode1);
         transactionProxy.write(writePath2, writeNode2);
@@ -1260,24 +1226,39 @@ public class TransactionProxyTest extends AbstractTransactionProxyTest {
         List<BatchedModifications> batchedModifications = captureBatchedModifications(actorRef);
         assertEquals("Captured BatchedModifications count", 3, batchedModifications.size());
 
-        verifyBatchedModifications(batchedModifications.get(0), new WriteModification(writePath1, writeNode1),
+        verifyBatchedModifications(batchedModifications.get(0), false, new WriteModification(writePath1, writeNode1),
                 new WriteModification(writePath2, writeNode2), new DeleteModification(deletePath1));
 
-        verifyBatchedModifications(batchedModifications.get(1), new MergeModification(mergePath1, mergeNode1),
+        verifyBatchedModifications(batchedModifications.get(1), false, new MergeModification(mergePath1, mergeNode1),
                 new MergeModification(mergePath2, mergeNode2), new WriteModification(writePath3, writeNode3));
 
-        verifyBatchedModifications(batchedModifications.get(2), new MergeModification(mergePath3, mergeNode3),
-                new DeleteModification(deletePath2));
+        verifyBatchedModifications(batchedModifications.get(2), true, true,
+                new MergeModification(mergePath3, mergeNode3), new DeleteModification(deletePath2));
+
+        assertEquals("getTotalMessageCount", 3, batchedModifications.get(2).getTotalMessagesSent());
+    }
+
+    @Test
+    public void testReadWriteModificationOperationBatching() throws Throwable {
+        testModificationOperationBatching(READ_WRITE);
+    }
+
+    @Test
+    public void testWriteOnlyModificationOperationBatching() throws Throwable {
+        testModificationOperationBatching(WRITE_ONLY);
+    }
 
-        verifyRecordingOperationFutures(transactionProxy.getRecordedOperationFutures(),
-                BatchedModificationsReply.class, BatchedModificationsReply.class, BatchedModificationsReply.class);
+    @Test
+    public void testOptimizedWriteOnlyModificationOperationBatching() throws Throwable {
+        dataStoreContextBuilder.writeOnlyTransactionOptimizationsEnabled(true);
+        testModificationOperationBatching(WRITE_ONLY);
     }
 
     @Test
     public void testModificationOperationBatchingWithInterleavedReads() throws Throwable {
+
         int shardBatchedModificationCount = 10;
-        doReturn(dataStoreContextBuilder.shardBatchedModificationCount(shardBatchedModificationCount).build()).
-                when(mockActorContext).getDatastoreContext();
+        dataStoreContextBuilder.shardBatchedModificationCount(shardBatchedModificationCount);
 
         ActorRef actorRef = setupActorContextWithInitialCreateTransaction(getSystem(), READ_WRITE);
 
@@ -1333,13 +1314,13 @@ public class TransactionProxyTest extends AbstractTransactionProxyTest {
         List<BatchedModifications> batchedModifications = captureBatchedModifications(actorRef);
         assertEquals("Captured BatchedModifications count", 3, batchedModifications.size());
 
-        verifyBatchedModifications(batchedModifications.get(0), new WriteModification(writePath1, writeNode1),
+        verifyBatchedModifications(batchedModifications.get(0), false, new WriteModification(writePath1, writeNode1),
                 new WriteModification(writePath2, writeNode2));
 
-        verifyBatchedModifications(batchedModifications.get(1), new MergeModification(mergePath1, mergeNode1),
+        verifyBatchedModifications(batchedModifications.get(1), false, new MergeModification(mergePath1, mergeNode1),
                 new MergeModification(mergePath2, mergeNode2));
 
-        verifyBatchedModifications(batchedModifications.get(2), new DeleteModification(deletePath));
+        verifyBatchedModifications(batchedModifications.get(2), false, new DeleteModification(deletePath));
 
         InOrder inOrder = Mockito.inOrder(mockActorContext);
         inOrder.verify(mockActorContext).executeOperationAsync(
@@ -1359,8 +1340,80 @@ public class TransactionProxyTest extends AbstractTransactionProxyTest {
 
         inOrder.verify(mockActorContext).executeOperationAsync(
                 eq(actorSelection(actorRef)), eqSerializedDataExists());
+    }
+
+    @Test
+    public void testReadRoot() throws ReadFailedException, InterruptedException, ExecutionException, java.util.concurrent.TimeoutException {
+
+        SchemaContext schemaContext = SchemaContextHelper.full();
+        Configuration configuration = mock(Configuration.class);
+        doReturn(configuration).when(mockActorContext).getConfiguration();
+        doReturn(schemaContext).when(mockActorContext).getSchemaContext();
+        doReturn(Sets.newHashSet("test", "cars")).when(configuration).getAllShardNames();
+
+        NormalizedNode<?, ?> expectedNode1 = ImmutableNodes.containerNode(TestModel.TEST_QNAME);
+        NormalizedNode<?, ?> expectedNode2 = ImmutableNodes.containerNode(CarsModel.CARS_QNAME);
 
-        verifyRecordingOperationFutures(transactionProxy.getRecordedOperationFutures(),
-                BatchedModificationsReply.class, BatchedModificationsReply.class, BatchedModificationsReply.class);
+        setUpReadData("test", NormalizedNodeAggregatorTest.getRootNode(expectedNode1, schemaContext));
+        setUpReadData("cars", NormalizedNodeAggregatorTest.getRootNode(expectedNode2, schemaContext));
+
+        doReturn(memberName).when(mockActorContext).getCurrentMemberName();
+
+        doReturn(10).when(mockActorContext).getTransactionOutstandingOperationLimit();
+
+        doReturn(getSystem().dispatchers().defaultGlobalDispatcher()).when(mockActorContext).getClientDispatcher();
+
+        TransactionProxy transactionProxy = new TransactionProxy(mockActorContext, READ_ONLY);
+
+        Optional<NormalizedNode<?, ?>> readOptional = transactionProxy.read(
+                YangInstanceIdentifier.builder().build()).get(5, TimeUnit.SECONDS);
+
+        assertEquals("NormalizedNode isPresent", true, readOptional.isPresent());
+
+        NormalizedNode<?, ?> normalizedNode = readOptional.get();
+
+        assertTrue("Expect value to be a Collection", normalizedNode.getValue() instanceof Collection);
+
+        Collection<NormalizedNode<?,?>> collection = (Collection<NormalizedNode<?,?>>) normalizedNode.getValue();
+
+        for(NormalizedNode<?,?> node : collection){
+            assertTrue("Expected " + node + " to be a ContainerNode", node instanceof ContainerNode);
+        }
+
+        assertTrue("Child with QName = " + TestModel.TEST_QNAME + " not found",
+                NormalizedNodeAggregatorTest.findChildWithQName(collection, TestModel.TEST_QNAME) != null);
+
+        assertEquals(expectedNode1, NormalizedNodeAggregatorTest.findChildWithQName(collection, TestModel.TEST_QNAME));
+
+        assertTrue("Child with QName = " + CarsModel.BASE_QNAME + " not found",
+                NormalizedNodeAggregatorTest.findChildWithQName(collection, CarsModel.BASE_QNAME) != null);
+
+        assertEquals(expectedNode2, NormalizedNodeAggregatorTest.findChildWithQName(collection, CarsModel.BASE_QNAME));
+    }
+
+
+    private void setUpReadData(String shardName, NormalizedNode<?, ?> expectedNode) {
+        ActorSystem actorSystem = getSystem();
+        ActorRef shardActorRef = getSystem().actorOf(Props.create(DoNothingActor.class));
+
+        doReturn(getSystem().actorSelection(shardActorRef.path())).
+                when(mockActorContext).actorSelection(shardActorRef.path().toString());
+
+        doReturn(primaryShardInfoReply(getSystem(), shardActorRef)).
+                when(mockActorContext).findPrimaryShardAsync(eq(shardName));
+
+        doReturn(true).when(mockActorContext).isPathLocal(shardActorRef.path().toString());
+
+        ActorRef txActorRef = actorSystem.actorOf(Props.create(DoNothingActor.class));
+
+        doReturn(actorSystem.actorSelection(txActorRef.path())).
+                when(mockActorContext).actorSelection(txActorRef.path().toString());
+
+        doReturn(Futures.successful(createTransactionReply(txActorRef, DataStoreVersions.CURRENT_VERSION))).when(mockActorContext).
+                executeOperationAsync(eq(actorSystem.actorSelection(shardActorRef.path())),
+                        eqCreateTransaction(memberName, TransactionType.READ_ONLY));
+
+        doReturn(readSerializedDataReply(expectedNode)).when(mockActorContext).executeOperationAsync(
+                eq(actorSelection(txActorRef)), eqSerializedReadData(YangInstanceIdentifier.builder().build()));
     }
 }