Use YangInstanceIdentifier.EMPTY
[controller.git] / opendaylight / md-sal / sal-distributed-datastore / src / test / java / org / opendaylight / controller / cluster / datastore / ShardTest.java
index 83dae880bad3fceef0133fdf692884ca2297f5c7..994c91ca89e318d36d9b032928fb5843004189ca 100644 (file)
@@ -11,9 +11,9 @@ package org.opendaylight.controller.cluster.datastore;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertSame;
 import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
 import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.inOrder;
 import static org.mockito.Mockito.mock;
@@ -32,6 +32,7 @@ import akka.persistence.SaveSnapshotSuccess;
 import akka.testkit.TestActorRef;
 import akka.util.Timeout;
 import com.google.common.base.Function;
+import com.google.common.base.Stopwatch;
 import com.google.common.util.concurrent.Futures;
 import com.google.common.util.concurrent.ListenableFuture;
 import com.google.common.util.concurrent.Uninterruptibles;
@@ -46,6 +47,7 @@ import org.junit.Test;
 import org.mockito.InOrder;
 import org.opendaylight.controller.cluster.DataPersistenceProvider;
 import org.opendaylight.controller.cluster.DelegatingPersistentDataProvider;
+import org.opendaylight.controller.cluster.access.concepts.MemberName;
 import org.opendaylight.controller.cluster.datastore.exceptions.NoShardLeaderException;
 import org.opendaylight.controller.cluster.datastore.identifiers.ShardIdentifier;
 import org.opendaylight.controller.cluster.datastore.jmx.mbeans.shard.ShardStats;
@@ -89,6 +91,8 @@ import org.opendaylight.controller.cluster.raft.base.messages.ElectionTimeout;
 import org.opendaylight.controller.cluster.raft.base.messages.FollowerInitialSyncUpStatus;
 import org.opendaylight.controller.cluster.raft.client.messages.FindLeader;
 import org.opendaylight.controller.cluster.raft.client.messages.FindLeaderReply;
+import org.opendaylight.controller.cluster.raft.client.messages.GetOnDemandRaftState;
+import org.opendaylight.controller.cluster.raft.client.messages.OnDemandRaftState;
 import org.opendaylight.controller.cluster.raft.messages.RequestVote;
 import org.opendaylight.controller.cluster.raft.messages.ServerRemoved;
 import org.opendaylight.controller.cluster.raft.policy.DisableElectionsRaftPolicy;
@@ -98,7 +102,7 @@ import org.opendaylight.controller.md.cluster.datastore.model.SchemaContextHelpe
 import org.opendaylight.controller.md.cluster.datastore.model.TestModel;
 import org.opendaylight.controller.md.sal.common.api.data.AsyncDataBroker;
 import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
-import org.opendaylight.controller.protobuff.messages.cohort3pc.ThreePhaseCommitCohortMessages;
+import org.opendaylight.yangtools.util.StringIdentifier;
 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.MapNode;
@@ -176,7 +180,7 @@ public class ShardTest extends AbstractShardTest {
                     // it does do a persist)
                     return new Shard(newShardBuilder()) {
                         @Override
-                        public void onReceiveCommand(final Object message) throws Exception {
+                        public void handleCommand(final Object message) {
                             if(message instanceof ElectionTimeout && firstElectionTimeout) {
                                 // Got the first ElectionTimeout. We don't forward it to the
                                 // base Shard yet until we've sent the RegisterChangeListener
@@ -199,13 +203,15 @@ public class ShardTest extends AbstractShardTest {
 
                                 onFirstElectionTimeout.countDown();
                             } else {
-                                super.onReceiveCommand(message);
+                                super.handleCommand(message);
                             }
                         }
                     };
                 }
             };
 
+            setupInMemorySnapshotStore();
+
             final MockDataChangeListener listener = new MockDataChangeListener(1);
             final ActorRef dclActor = actorFactory.createActor(DataChangeListener.props(listener),
                     "testRegisterChangeListenerWhenNotLeaderInitially-DataChangeListener");
@@ -214,9 +220,7 @@ public class ShardTest extends AbstractShardTest {
                     Props.create(new DelegatingShardCreator(creator)).withDispatcher(Dispatchers.DefaultDispatcherId()),
                     "testRegisterChangeListenerWhenNotLeaderInitially");
 
-            // Write initial data into the in-memory store.
             final YangInstanceIdentifier path = TestModel.TEST_PATH;
-            writeToStore(shard, path, ImmutableNodes.containerNode(TestModel.TEST_QNAME));
 
             // Wait until the shard receives the first ElectionTimeout message.
             assertEquals("Got first ElectionTimeout", true,
@@ -231,10 +235,10 @@ public class ShardTest extends AbstractShardTest {
             assertNotNull("getListenerRegistrationPath", reply.getListenerRegistrationPath());
 
             // Sanity check - verify the shard is not the leader yet.
-            shard.tell(new FindLeader(), getRef());
+            shard.tell(FindLeader.INSTANCE, getRef());
             final FindLeaderReply findLeadeReply =
                     expectMsgClass(duration("5 seconds"), FindLeaderReply.class);
-            assertNull("Expected the shard not to be the leader", findLeadeReply.getLeaderActor());
+            assertFalse("Expected the shard not to be the leader", findLeadeReply.getLeaderActor().isPresent());
 
             // Signal the onChangeListenerRegistered latch to tell the thread above to proceed
             // with the election process.
@@ -286,10 +290,9 @@ public class ShardTest extends AbstractShardTest {
 
                 @Override
                 public Shard create() throws Exception {
-                    return new Shard(Shard.builder().id(shardID).datastoreContext(
-                            dataStoreContextBuilder.persistent(false).build()).schemaContext(SCHEMA_CONTEXT)) {
+                    return new Shard(newShardBuilder()) {
                         @Override
-                        public void onReceiveCommand(final Object message) throws Exception {
+                        public void handleCommand(final Object message) {
                             if(message instanceof ElectionTimeout && firstElectionTimeout) {
                                 firstElectionTimeout = false;
                                 final ActorRef self = getSelf();
@@ -304,13 +307,15 @@ public class ShardTest extends AbstractShardTest {
 
                                 onFirstElectionTimeout.countDown();
                             } else {
-                                super.onReceiveCommand(message);
+                                super.handleCommand(message);
                             }
                         }
                     };
                 }
             };
 
+            setupInMemorySnapshotStore();
+
             final MockDataTreeChangeListener listener = new MockDataTreeChangeListener(1);
             final ActorRef dclActor = actorFactory.createActor(DataTreeChangeListenerActor.props(listener),
                     "testDataTreeChangeListenerNotifiedWhenNotTheLeaderOnRegistration-DataChangeListener");
@@ -320,7 +325,6 @@ public class ShardTest extends AbstractShardTest {
                     "testDataTreeChangeListenerNotifiedWhenNotTheLeaderOnRegistration");
 
             final YangInstanceIdentifier path = TestModel.TEST_PATH;
-            writeToStore(shard, path, ImmutableNodes.containerNode(TestModel.TEST_QNAME));
 
             assertEquals("Got first ElectionTimeout", true,
                 onFirstElectionTimeout.await(5, TimeUnit.SECONDS));
@@ -330,12 +334,11 @@ public class ShardTest extends AbstractShardTest {
                 RegisterDataTreeChangeListenerReply.class);
             assertNotNull("getListenerRegistratioznPath", reply.getListenerRegistrationPath());
 
-            shard.tell(new FindLeader(), getRef());
+            shard.tell(FindLeader.INSTANCE, getRef());
             final FindLeaderReply findLeadeReply =
                     expectMsgClass(duration("5 seconds"), FindLeaderReply.class);
-            assertNull("Expected the shard not to be the leader", findLeadeReply.getLeaderActor());
+            assertFalse("Expected the shard not to be the leader", findLeadeReply.getLeaderActor().isPresent());
 
-            writeToStore(shard, path, ImmutableNodes.containerNode(TestModel.TEST_QNAME));
 
             onChangeListenerRegistered.countDown();
 
@@ -384,48 +387,20 @@ public class ShardTest extends AbstractShardTest {
         }};
     }
 
-    @SuppressWarnings("serial")
     @Test
     public void testPeerAddressResolved() throws Exception {
         new ShardTestKit(getSystem()) {{
-            final CountDownLatch recoveryComplete = new CountDownLatch(1);
-            class TestShard extends Shard {
-                TestShard() {
-                    super(Shard.builder().id(shardID).datastoreContext(newDatastoreContext()).
-                            peerAddresses(Collections.<String, String>singletonMap(shardID.toString(), null)).
-                            schemaContext(SCHEMA_CONTEXT));
-                }
-
-                String getPeerAddress(String id) {
-                    return getRaftActorContext().getPeerAddress(id);
-                }
-
-                @Override
-                protected void onRecoveryComplete() {
-                    try {
-                        super.onRecoveryComplete();
-                    } finally {
-                        recoveryComplete.countDown();
-                    }
-                }
-            }
-
-            final TestActorRef<Shard> shard = actorFactory.createTestActor(
-                    Props.create(new DelegatingShardCreator(new Creator<Shard>() {
-                        @Override
-                        public TestShard create() throws Exception {
-                            return new TestShard();
-                        }
-                    })), "testPeerAddressResolved");
-
-            assertEquals("Recovery complete", true,
-                Uninterruptibles.awaitUninterruptibly(recoveryComplete, 5, TimeUnit.SECONDS));
+            ShardIdentifier peerID = ShardIdentifier.create("inventory", MemberName.forName("member-2"), "config");
+            final TestActorRef<Shard> shard = actorFactory.createTestActor(newShardBuilder().
+                    peerAddresses(Collections.<String, String>singletonMap(peerID.toString(), null)).props().
+                        withDispatcher(Dispatchers.DefaultDispatcherId()), "testPeerAddressResolved");
 
             final String address = "akka://foobar";
-            shard.underlyingActor().onReceiveCommand(new PeerAddressResolved(shardID.toString(), address));
+            shard.tell(new PeerAddressResolved(peerID.toString(), address), ActorRef.noSender());
 
-            assertEquals("getPeerAddress", address,
-                ((TestShard) shard.underlyingActor()).getPeerAddress(shardID.toString()));
+            shard.tell(GetOnDemandRaftState.INSTANCE, getRef());
+            OnDemandRaftState state = expectMsgClass(OnDemandRaftState.class);
+            assertEquals("getPeerAddress", address, state.getPeerAddresses().get(peerID.toString()));
         }};
     }
 
@@ -446,7 +421,7 @@ public class ShardTest extends AbstractShardTest {
 
         writeToStore(store, TestModel.TEST_PATH, container);
 
-        final YangInstanceIdentifier root = YangInstanceIdentifier.builder().build();
+        final YangInstanceIdentifier root = YangInstanceIdentifier.EMPTY;
         final NormalizedNode<?,?> expected = readStore(store, root);
 
         final Snapshot snapshot = Snapshot.create(SerializationUtils.serializeNormalizedNode(expected),
@@ -471,13 +446,23 @@ public class ShardTest extends AbstractShardTest {
         writeMod.write(TestModel.TEST_PATH, node);
         writeMod.ready();
 
-        final ApplyState applyState = new ApplyState(null, "test", new ReplicatedLogImplEntry(1, 2,
-                payloadForModification(source, writeMod)));
+        final ApplyState applyState = new ApplyState(null, new StringIdentifier("test"),
+            new ReplicatedLogImplEntry(1, 2, payloadForModification(source, writeMod)));
+
+        shard.tell(applyState, shard);
 
-        shard.underlyingActor().onReceiveCommand(applyState);
+        Stopwatch sw = Stopwatch.createStarted();
+        while(sw.elapsed(TimeUnit.SECONDS) <= 5) {
+            Uninterruptibles.sleepUninterruptibly(75, TimeUnit.MILLISECONDS);
 
-        final NormalizedNode<?,?> actual = readStore(shard, TestModel.TEST_PATH);
-        assertEquals("Applied state", node, actual);
+            final NormalizedNode<?,?> actual = readStore(shard, TestModel.TEST_PATH);
+            if(actual != null) {
+                assertEquals("Applied state", node, actual);
+                return;
+            }
+        }
+
+        fail("State was not applied");
     }
 
     @Test
@@ -560,9 +545,9 @@ public class ShardTest extends AbstractShardTest {
 
             // Send the CanCommitTransaction message for the first Tx.
 
-            shard.tell(new CanCommitTransaction(transactionID1).toSerializable(), getRef());
+            shard.tell(new CanCommitTransaction(transactionID1, CURRENT_VERSION).toSerializable(), getRef());
             final CanCommitTransactionReply canCommitReply = CanCommitTransactionReply.fromSerializable(
-                    expectMsgClass(duration, CanCommitTransactionReply.SERIALIZABLE_CLASS));
+                    expectMsgClass(duration, CanCommitTransactionReply.class));
             assertEquals("Can commit", true, canCommitReply.getCanCommit());
 
             shard.tell(prepareReadyTransactionMessage(false, shard.underlyingActor(), cohort2, transactionID2, modification2), getRef());
@@ -575,16 +560,16 @@ public class ShardTest extends AbstractShardTest {
             // processed after the first Tx completes.
 
             final Future<Object> canCommitFuture1 = Patterns.ask(shard,
-                    new CanCommitTransaction(transactionID2).toSerializable(), timeout);
+                    new CanCommitTransaction(transactionID2, CURRENT_VERSION).toSerializable(), timeout);
 
             final Future<Object> canCommitFuture2 = Patterns.ask(shard,
-                    new CanCommitTransaction(transactionID3).toSerializable(), timeout);
+                    new CanCommitTransaction(transactionID3, CURRENT_VERSION).toSerializable(), timeout);
 
             // Send the CommitTransaction message for the first Tx. After it completes, it should
             // trigger the 2nd Tx to proceed which should in turn then trigger the 3rd.
 
-            shard.tell(new CommitTransaction(transactionID1).toSerializable(), getRef());
-            expectMsgClass(duration, CommitTransactionReply.SERIALIZABLE_CLASS);
+            shard.tell(new CommitTransaction(transactionID1, CURRENT_VERSION).toSerializable(), getRef());
+            expectMsgClass(duration, CommitTransactionReply.class);
 
             // Wait for the next 2 Tx's to complete.
 
@@ -618,7 +603,7 @@ public class ShardTest extends AbstractShardTest {
 
             class OnCommitFutureComplete extends OnFutureComplete {
                 OnCommitFutureComplete() {
-                    super(CommitTransactionReply.SERIALIZABLE_CLASS);
+                    super(CommitTransactionReply.class);
                 }
 
                 @Override
@@ -632,7 +617,7 @@ public class ShardTest extends AbstractShardTest {
                 private final String transactionID;
 
                 OnCanCommitFutureComplete(final String transactionID) {
-                    super(CanCommitTransactionReply.SERIALIZABLE_CLASS);
+                    super(CanCommitTransactionReply.class);
                     this.transactionID = transactionID;
                 }
 
@@ -643,7 +628,7 @@ public class ShardTest extends AbstractShardTest {
                     assertEquals("Can commit", true, canCommitReply.getCanCommit());
 
                     final Future<Object> commitFuture = Patterns.ask(shard,
-                            new CommitTransaction(transactionID).toSerializable(), timeout);
+                            new CommitTransaction(transactionID, CURRENT_VERSION).toSerializable(), timeout);
                     commitFuture.onComplete(new OnCommitFutureComplete(), getSystem().dispatcher());
                 }
             }
@@ -694,15 +679,12 @@ public class ShardTest extends AbstractShardTest {
             final FiniteDuration duration = duration("5 seconds");
 
             final AtomicReference<ShardDataTreeCohort> mockCohort = new AtomicReference<>();
-            final ShardCommitCoordinator.CohortDecorator cohortDecorator = new ShardCommitCoordinator.CohortDecorator() {
-                @Override
-                public ShardDataTreeCohort decorate(final String txID, final ShardDataTreeCohort actual) {
-                    if(mockCohort.get() == null) {
-                        mockCohort.set(createDelegatingMockCohort("cohort", actual));
-                    }
-
-                    return mockCohort.get();
+            final ShardCommitCoordinator.CohortDecorator cohortDecorator = (txID, actual) -> {
+                if(mockCohort.get() == null) {
+                    mockCohort.set(createDelegatingMockCohort("cohort", actual));
                 }
+
+                return mockCohort.get();
             };
 
             shard.underlyingActor().getCommitCoordinator().setCohortDecorator(cohortDecorator);
@@ -726,15 +708,15 @@ public class ShardTest extends AbstractShardTest {
 
             // Send the CanCommitTransaction message.
 
-            shard.tell(new CanCommitTransaction(transactionID).toSerializable(), getRef());
+            shard.tell(new CanCommitTransaction(transactionID, CURRENT_VERSION).toSerializable(), getRef());
             final CanCommitTransactionReply canCommitReply = CanCommitTransactionReply.fromSerializable(
-                    expectMsgClass(duration, CanCommitTransactionReply.SERIALIZABLE_CLASS));
+                    expectMsgClass(duration, CanCommitTransactionReply.class));
             assertEquals("Can commit", true, canCommitReply.getCanCommit());
 
             // Send the CanCommitTransaction message.
 
-            shard.tell(new CommitTransaction(transactionID).toSerializable(), getRef());
-            expectMsgClass(duration, CommitTransactionReply.SERIALIZABLE_CLASS);
+            shard.tell(new CommitTransaction(transactionID, CURRENT_VERSION).toSerializable(), getRef());
+            expectMsgClass(duration, CommitTransactionReply.class);
 
             final InOrder inOrder = inOrder(mockCohort.get());
             inOrder.verify(mockCohort.get()).canCommit();
@@ -760,15 +742,12 @@ public class ShardTest extends AbstractShardTest {
             final FiniteDuration duration = duration("5 seconds");
 
             final AtomicReference<ShardDataTreeCohort> mockCohort = new AtomicReference<>();
-            final ShardCommitCoordinator.CohortDecorator cohortDecorator = new ShardCommitCoordinator.CohortDecorator() {
-                @Override
-                public ShardDataTreeCohort decorate(final String txID, final ShardDataTreeCohort actual) {
-                    if(mockCohort.get() == null) {
-                        mockCohort.set(createDelegatingMockCohort("cohort", actual));
-                    }
-
-                    return mockCohort.get();
+            final ShardCommitCoordinator.CohortDecorator cohortDecorator = (txID, actual) -> {
+                if(mockCohort.get() == null) {
+                    mockCohort.set(createDelegatingMockCohort("cohort", actual));
                 }
+
+                return mockCohort.get();
             };
 
             shard.underlyingActor().getCommitCoordinator().setCohortDecorator(cohortDecorator);
@@ -789,7 +768,7 @@ public class ShardTest extends AbstractShardTest {
                     TestModel.OUTER_LIST_PATH).nodeWithKey(TestModel.OUTER_LIST_QNAME, TestModel.ID_QNAME, 1).build(),
                 ImmutableNodes.mapEntry(TestModel.OUTER_LIST_QNAME, TestModel.ID_QNAME, 1), true, true, 3), getRef());
 
-            expectMsgClass(duration, CommitTransactionReply.SERIALIZABLE_CLASS);
+            expectMsgClass(duration, CommitTransactionReply.class);
 
             final InOrder inOrder = inOrder(mockCohort.get());
             inOrder.verify(mockCohort.get()).canCommit();
@@ -899,13 +878,13 @@ public class ShardTest extends AbstractShardTest {
 
             // Commit the write transaction.
 
-            shard.tell(new CanCommitTransaction(transactionID1).toSerializable(), getRef());
+            shard.tell(new CanCommitTransaction(transactionID1, CURRENT_VERSION).toSerializable(), getRef());
             final CanCommitTransactionReply canCommitReply = CanCommitTransactionReply.fromSerializable(
-                    expectMsgClass(duration, CanCommitTransactionReply.SERIALIZABLE_CLASS));
+                    expectMsgClass(duration, CanCommitTransactionReply.class));
             assertEquals("Can commit", true, canCommitReply.getCanCommit());
 
-            shard.tell(new CommitTransaction(transactionID1).toSerializable(), getRef());
-            expectMsgClass(duration, CommitTransactionReply.SERIALIZABLE_CLASS);
+            shard.tell(new CommitTransaction(transactionID1, CURRENT_VERSION).toSerializable(), getRef());
+            expectMsgClass(duration, CommitTransactionReply.class);
 
             // Verify data in the data store.
 
@@ -980,8 +959,12 @@ public class ShardTest extends AbstractShardTest {
     }
 
     @Test
-    public void testReadyWithImmediateCommit() throws Exception{
+    public void testReadyWithReadWriteImmediateCommit() throws Exception{
         testReadyWithImmediateCommit(true);
+    }
+
+    @Test
+    public void testReadyWithWriteOnlyImmediateCommit() throws Exception{
         testReadyWithImmediateCommit(false);
     }
 
@@ -1005,7 +988,7 @@ public class ShardTest extends AbstractShardTest {
 
             shard.tell(prepareReadyTransactionMessage(readWrite, shard.underlyingActor(), cohort, transactionID, modification, true), getRef());
 
-            expectMsgClass(duration, ThreePhaseCommitCohortMessages.CommitTransactionReply.class);
+            expectMsgClass(duration, CommitTransactionReply.class);
 
             final InOrder inOrder = inOrder(cohort);
             inOrder.verify(cohort).canCommit();
@@ -1041,7 +1024,7 @@ public class ShardTest extends AbstractShardTest {
 
             shard.tell(readyMessage, getRef());
 
-            expectMsgClass(CommitTransactionReply.SERIALIZABLE_CLASS);
+            expectMsgClass(CommitTransactionReply.class);
 
             final NormalizedNode<?, ?> actualNode = readStore(shard, TestModel.OUTER_LIST_PATH);
             assertEquals(TestModel.OUTER_LIST_QNAME.getLocalName(), mergeData, actualNode);
@@ -1076,15 +1059,15 @@ public class ShardTest extends AbstractShardTest {
 
             // Send the CanCommitTransaction message.
 
-            shard.tell(new CanCommitTransaction(txId).toSerializable(), getRef());
+            shard.tell(new CanCommitTransaction(txId, CURRENT_VERSION).toSerializable(), getRef());
             final CanCommitTransactionReply canCommitReply = CanCommitTransactionReply.fromSerializable(
-                    expectMsgClass(CanCommitTransactionReply.SERIALIZABLE_CLASS));
+                    expectMsgClass(CanCommitTransactionReply.class));
             assertEquals("Can commit", true, canCommitReply.getCanCommit());
 
             // Send the CanCommitTransaction message.
 
-            shard.tell(new CommitTransaction(txId).toSerializable(), getRef());
-            expectMsgClass(CommitTransactionReply.SERIALIZABLE_CLASS);
+            shard.tell(new CommitTransaction(txId, CURRENT_VERSION).toSerializable(), getRef());
+            expectMsgClass(CommitTransactionReply.class);
 
             final NormalizedNode<?, ?> actualNode = readStore(shard, TestModel.OUTER_LIST_PATH);
             assertEquals(TestModel.OUTER_LIST_QNAME.getLocalName(), mergeData, actualNode);
@@ -1092,9 +1075,13 @@ public class ShardTest extends AbstractShardTest {
     }
 
     @Test
-    public void testCommitWithPersistenceDisabled() throws Throwable {
+    public void testReadWriteCommitWithPersistenceDisabled() throws Throwable {
+        testCommitWithPersistenceDisabled(true);
+    }
+
+    @Test
+    public void testWriteOnlyCommitWithPersistenceDisabled() throws Throwable {
         testCommitWithPersistenceDisabled(true);
-        testCommitWithPersistenceDisabled(false);
     }
 
     private void testCommitWithPersistenceDisabled(final boolean readWrite) throws Throwable {
@@ -1123,15 +1110,15 @@ public class ShardTest extends AbstractShardTest {
 
             // Send the CanCommitTransaction message.
 
-            shard.tell(new CanCommitTransaction(transactionID).toSerializable(), getRef());
+            shard.tell(new CanCommitTransaction(transactionID, CURRENT_VERSION).toSerializable(), getRef());
             final CanCommitTransactionReply canCommitReply = CanCommitTransactionReply.fromSerializable(
-                    expectMsgClass(duration, CanCommitTransactionReply.SERIALIZABLE_CLASS));
+                    expectMsgClass(duration, CanCommitTransactionReply.class));
             assertEquals("Can commit", true, canCommitReply.getCanCommit());
 
             // Send the CanCommitTransaction message.
 
-            shard.tell(new CommitTransaction(transactionID).toSerializable(), getRef());
-            expectMsgClass(duration, CommitTransactionReply.SERIALIZABLE_CLASS);
+            shard.tell(new CommitTransaction(transactionID, CURRENT_VERSION).toSerializable(), getRef());
+            expectMsgClass(duration, CommitTransactionReply.class);
 
             final InOrder inOrder = inOrder(cohort);
             inOrder.verify(cohort).canCommit();
@@ -1144,8 +1131,12 @@ public class ShardTest extends AbstractShardTest {
     }
 
     @Test
-    public void testCommitWhenTransactionHasNoModifications() {
+    public void testReadWriteCommitWhenTransactionHasNoModifications() {
         testCommitWhenTransactionHasNoModifications(true);
+    }
+
+    @Test
+    public void testWriteOnlyCommitWhenTransactionHasNoModifications() {
         testCommitWhenTransactionHasNoModifications(false);
     }
 
@@ -1175,13 +1166,13 @@ public class ShardTest extends AbstractShardTest {
 
                 // Send the CanCommitTransaction message.
 
-                shard.tell(new CanCommitTransaction(transactionID).toSerializable(), getRef());
+                shard.tell(new CanCommitTransaction(transactionID, CURRENT_VERSION).toSerializable(), getRef());
                 final CanCommitTransactionReply canCommitReply = CanCommitTransactionReply.fromSerializable(
-                        expectMsgClass(duration, CanCommitTransactionReply.SERIALIZABLE_CLASS));
+                        expectMsgClass(duration, CanCommitTransactionReply.class));
                 assertEquals("Can commit", true, canCommitReply.getCanCommit());
 
-                shard.tell(new CommitTransaction(transactionID).toSerializable(), getRef());
-                expectMsgClass(duration, ThreePhaseCommitCohortMessages.CommitTransactionReply.class);
+                shard.tell(new CommitTransaction(transactionID, CURRENT_VERSION).toSerializable(), getRef());
+                expectMsgClass(duration, CommitTransactionReply.class);
 
                 final InOrder inOrder = inOrder(cohort);
                 inOrder.verify(cohort).canCommit();
@@ -1202,8 +1193,12 @@ public class ShardTest extends AbstractShardTest {
     }
 
     @Test
-    public void testCommitWhenTransactionHasModifications() {
+    public void testReadWriteCommitWhenTransactionHasModifications() {
         testCommitWhenTransactionHasModifications(true);
+    }
+
+    @Test
+    public void testWriteOnlyCommitWhenTransactionHasModifications() {
         testCommitWhenTransactionHasModifications(false);
     }
 
@@ -1218,7 +1213,7 @@ public class ShardTest extends AbstractShardTest {
 
                 final String transactionID = "tx1";
                 final MutableCompositeModification modification = new MutableCompositeModification();
-                modification.addModification(new DeleteModification(YangInstanceIdentifier.builder().build()));
+                modification.addModification(new DeleteModification(YangInstanceIdentifier.EMPTY));
                 final ShardDataTreeCohort cohort = mock(ShardDataTreeCohort.class, "cohort1");
                 doReturn(Futures.immediateFuture(Boolean.TRUE)).when(cohort).canCommit();
                 doReturn(Futures.immediateFuture(Boolean.TRUE)).when(cohort).preCommit();
@@ -1232,13 +1227,13 @@ public class ShardTest extends AbstractShardTest {
 
                 // Send the CanCommitTransaction message.
 
-                shard.tell(new CanCommitTransaction(transactionID).toSerializable(), getRef());
+                shard.tell(new CanCommitTransaction(transactionID, CURRENT_VERSION).toSerializable(), getRef());
                 final CanCommitTransactionReply canCommitReply = CanCommitTransactionReply.fromSerializable(
-                        expectMsgClass(duration, CanCommitTransactionReply.SERIALIZABLE_CLASS));
+                        expectMsgClass(duration, CanCommitTransactionReply.class));
                 assertEquals("Can commit", true, canCommitReply.getCanCommit());
 
-                shard.tell(new CommitTransaction(transactionID).toSerializable(), getRef());
-                expectMsgClass(duration, ThreePhaseCommitCohortMessages.CommitTransactionReply.class);
+                shard.tell(new CommitTransaction(transactionID, CURRENT_VERSION).toSerializable(), getRef());
+                expectMsgClass(duration, CommitTransactionReply.class);
 
                 final InOrder inOrder = inOrder(cohort);
                 inOrder.verify(cohort).canCommit();
@@ -1280,7 +1275,7 @@ public class ShardTest extends AbstractShardTest {
             final ShardDataTreeCohort cohort1 = mock(ShardDataTreeCohort.class, "cohort1");
             doReturn(Futures.immediateFuture(Boolean.TRUE)).when(cohort1).canCommit();
             doReturn(Futures.immediateFuture(null)).when(cohort1).preCommit();
-            doReturn(Futures.immediateFailedFuture(new IllegalStateException("mock"))).when(cohort1).commit();
+            doReturn(Futures.immediateFailedFuture(new RuntimeException("mock"))).when(cohort1).commit();
             doReturn(mockCandidate("cohort1-candidate")).when(cohort1).getCandidate();
 
             final String transactionID2 = "tx2";
@@ -1299,21 +1294,21 @@ public class ShardTest extends AbstractShardTest {
 
             // Send the CanCommitTransaction message for the first Tx.
 
-            shard.tell(new CanCommitTransaction(transactionID1).toSerializable(), getRef());
+            shard.tell(new CanCommitTransaction(transactionID1, CURRENT_VERSION).toSerializable(), getRef());
             final CanCommitTransactionReply canCommitReply = CanCommitTransactionReply.fromSerializable(
-                    expectMsgClass(duration, CanCommitTransactionReply.SERIALIZABLE_CLASS));
+                    expectMsgClass(duration, CanCommitTransactionReply.class));
             assertEquals("Can commit", true, canCommitReply.getCanCommit());
 
             // Send the CanCommitTransaction message for the 2nd Tx. This should get queued and
             // processed after the first Tx completes.
 
             final Future<Object> canCommitFuture = Patterns.ask(shard,
-                    new CanCommitTransaction(transactionID2).toSerializable(), timeout);
+                    new CanCommitTransaction(transactionID2, CURRENT_VERSION).toSerializable(), timeout);
 
             // Send the CommitTransaction message for the first Tx. This should send back an error
             // and trigger the 2nd Tx to proceed.
 
-            shard.tell(new CommitTransaction(transactionID1).toSerializable(), getRef());
+            shard.tell(new CommitTransaction(transactionID1, CURRENT_VERSION).toSerializable(), getRef());
             expectMsgClass(duration, akka.actor.Status.Failure.class);
 
             // Wait for the 2nd Tx to complete the canCommit phase.
@@ -1372,21 +1367,21 @@ public class ShardTest extends AbstractShardTest {
 
             // Send the CanCommitTransaction message for the first Tx.
 
-            shard.tell(new CanCommitTransaction(transactionID1).toSerializable(), getRef());
+            shard.tell(new CanCommitTransaction(transactionID1, CURRENT_VERSION).toSerializable(), getRef());
             final CanCommitTransactionReply canCommitReply = CanCommitTransactionReply.fromSerializable(
-                expectMsgClass(duration, CanCommitTransactionReply.SERIALIZABLE_CLASS));
+                expectMsgClass(duration, CanCommitTransactionReply.class));
             assertEquals("Can commit", true, canCommitReply.getCanCommit());
 
             // Send the CanCommitTransaction message for the 2nd Tx. This should get queued and
             // processed after the first Tx completes.
 
             final Future<Object> canCommitFuture = Patterns.ask(shard,
-                    new CanCommitTransaction(transactionID2).toSerializable(), timeout);
+                    new CanCommitTransaction(transactionID2, CURRENT_VERSION).toSerializable(), timeout);
 
             // Send the CommitTransaction message for the first Tx. This should send back an error
             // and trigger the 2nd Tx to proceed.
 
-            shard.tell(new CommitTransaction(transactionID1).toSerializable(), getRef());
+            shard.tell(new CommitTransaction(transactionID1, CURRENT_VERSION).toSerializable(), getRef());
             expectMsgClass(duration, akka.actor.Status.Failure.class);
 
             // Wait for the 2nd Tx to complete the canCommit phase.
@@ -1434,7 +1429,7 @@ public class ShardTest extends AbstractShardTest {
 
             // Send the CanCommitTransaction message.
 
-            shard.tell(new CanCommitTransaction(transactionID1).toSerializable(), getRef());
+            shard.tell(new CanCommitTransaction(transactionID1, CURRENT_VERSION).toSerializable(), getRef());
             expectMsgClass(duration, akka.actor.Status.Failure.class);
 
             // Send another can commit to ensure the failed one got cleaned up.
@@ -1447,9 +1442,9 @@ public class ShardTest extends AbstractShardTest {
             shard.tell(prepareReadyTransactionMessage(readWrite, shard.underlyingActor(), cohort, transactionID2, modification), getRef());
             expectMsgClass(duration, ReadyTransactionReply.class);
 
-            shard.tell(new CanCommitTransaction(transactionID2).toSerializable(), getRef());
+            shard.tell(new CanCommitTransaction(transactionID2, CURRENT_VERSION).toSerializable(), getRef());
             final CanCommitTransactionReply reply = CanCommitTransactionReply.fromSerializable(
-                    expectMsgClass(CanCommitTransactionReply.SERIALIZABLE_CLASS));
+                    expectMsgClass(CanCommitTransactionReply.class));
             assertEquals("getCanCommit", true, reply.getCanCommit());
         }};
     }
@@ -1480,9 +1475,9 @@ public class ShardTest extends AbstractShardTest {
 
             // Send the CanCommitTransaction message.
 
-            shard.tell(new CanCommitTransaction(transactionID1).toSerializable(), getRef());
+            shard.tell(new CanCommitTransaction(transactionID1, CURRENT_VERSION).toSerializable(), getRef());
             CanCommitTransactionReply reply = CanCommitTransactionReply.fromSerializable(
-                    expectMsgClass(CanCommitTransactionReply.SERIALIZABLE_CLASS));
+                    expectMsgClass(CanCommitTransactionReply.class));
             assertEquals("getCanCommit", false, reply.getCanCommit());
 
             // Send another can commit to ensure the failed one got cleaned up.
@@ -1495,9 +1490,9 @@ public class ShardTest extends AbstractShardTest {
             shard.tell(prepareReadyTransactionMessage(readWrite, shard.underlyingActor(), cohort, transactionID2, modification), getRef());
             expectMsgClass(duration, ReadyTransactionReply.class);
 
-            shard.tell(new CanCommitTransaction(transactionID2).toSerializable(), getRef());
+            shard.tell(new CanCommitTransaction(transactionID2, CURRENT_VERSION).toSerializable(), getRef());
             reply = CanCommitTransactionReply.fromSerializable(
-                    expectMsgClass(CanCommitTransactionReply.SERIALIZABLE_CLASS));
+                    expectMsgClass(CanCommitTransactionReply.class));
             assertEquals("getCanCommit", true, reply.getCanCommit());
         }};
     }
@@ -1539,11 +1534,12 @@ public class ShardTest extends AbstractShardTest {
             final DataTreeCandidateNode candidateRoot = mock(DataTreeCandidateNode.class);
             doReturn(ModificationType.UNMODIFIED).when(candidateRoot).getModificationType();
             doReturn(candidateRoot).when(candidate).getRootNode();
+            doReturn(YangInstanceIdentifier.EMPTY).when(candidate).getRootPath();
             doReturn(candidate).when(cohort).getCandidate();
 
             shard.tell(prepareReadyTransactionMessage(readWrite, shard.underlyingActor(), cohort, transactionID2, modification, true), getRef());
 
-            expectMsgClass(duration, CommitTransactionReply.SERIALIZABLE_CLASS);
+            expectMsgClass(duration, CommitTransactionReply.class);
         }};
     }
 
@@ -1584,11 +1580,12 @@ public class ShardTest extends AbstractShardTest {
             final DataTreeCandidateNode candidateRoot = mock(DataTreeCandidateNode.class);
             doReturn(ModificationType.UNMODIFIED).when(candidateRoot).getModificationType();
             doReturn(candidateRoot).when(candidate).getRootNode();
+            doReturn(YangInstanceIdentifier.EMPTY).when(candidate).getRootPath();
             doReturn(candidate).when(cohort).getCandidate();
 
             shard.tell(prepareReadyTransactionMessage(readWrite, shard.underlyingActor(), cohort, transactionID2, modification, true), getRef());
 
-            expectMsgClass(duration, CommitTransactionReply.SERIALIZABLE_CLASS);
+            expectMsgClass(duration, CommitTransactionReply.class);
         }};
     }
 
@@ -1611,23 +1608,20 @@ public class ShardTest extends AbstractShardTest {
 
             final String transactionID = "tx1";
             final Function<ShardDataTreeCohort, ListenableFuture<Void>> preCommit =
-                          new Function<ShardDataTreeCohort, ListenableFuture<Void>>() {
-                @Override
-                public ListenableFuture<Void> apply(final ShardDataTreeCohort cohort) {
-                    final ListenableFuture<Void> preCommitFuture = cohort.preCommit();
-
-                    // Simulate an AbortTransaction message occurring during replication, after
-                    // persisting and before finishing the commit to the in-memory store.
-                    // We have no followers so due to optimizations in the RaftActor, it does not
-                    // attempt replication and thus we can't send an AbortTransaction message b/c
-                    // it would be processed too late after CommitTransaction completes. So we'll
-                    // simulate an AbortTransaction message occurring during replication by calling
-                    // the shard directly.
-                    //
-                    shard.underlyingActor().doAbortTransaction(transactionID, null);
-
-                    return preCommitFuture;
-                }
+                          cohort -> {
+                final ListenableFuture<Void> preCommitFuture = cohort.preCommit();
+
+                // Simulate an AbortTransaction message occurring during replication, after
+                // persisting and before finishing the commit to the in-memory store.
+                // We have no followers so due to optimizations in the RaftActor, it does not
+                // attempt replication and thus we can't send an AbortTransaction message b/c
+                // it would be processed too late after CommitTransaction completes. So we'll
+                // simulate an AbortTransaction message occurring during replication by calling
+                // the shard directly.
+                //
+                shard.underlyingActor().doAbortTransaction(transactionID, null);
+
+                return preCommitFuture;
             };
 
             final MutableCompositeModification modification = new MutableCompositeModification();
@@ -1638,13 +1632,13 @@ public class ShardTest extends AbstractShardTest {
             shard.tell(prepareReadyTransactionMessage(readWrite, shard.underlyingActor(), cohort, transactionID, modification), getRef());
             expectMsgClass(duration, ReadyTransactionReply.class);
 
-            shard.tell(new CanCommitTransaction(transactionID).toSerializable(), getRef());
+            shard.tell(new CanCommitTransaction(transactionID, CURRENT_VERSION).toSerializable(), getRef());
             final CanCommitTransactionReply canCommitReply = CanCommitTransactionReply.fromSerializable(
-                expectMsgClass(duration, CanCommitTransactionReply.SERIALIZABLE_CLASS));
+                expectMsgClass(duration, CanCommitTransactionReply.class));
             assertEquals("Can commit", true, canCommitReply.getCanCommit());
 
-            shard.tell(new CommitTransaction(transactionID).toSerializable(), getRef());
-            expectMsgClass(duration, CommitTransactionReply.SERIALIZABLE_CLASS);
+            shard.tell(new CommitTransaction(transactionID, CURRENT_VERSION).toSerializable(), getRef());
+            expectMsgClass(duration, CommitTransactionReply.class);
 
             final NormalizedNode<?, ?> node = readStore(shard, TestModel.TEST_PATH);
 
@@ -1710,23 +1704,23 @@ public class ShardTest extends AbstractShardTest {
 
             // canCommit 1st Tx. We don't send the commit so it should timeout.
 
-            shard.tell(new CanCommitTransaction(transactionID1).toSerializable(), getRef());
-            expectMsgClass(duration, CanCommitTransactionReply.SERIALIZABLE_CLASS);
+            shard.tell(new CanCommitTransaction(transactionID1, CURRENT_VERSION).toSerializable(), getRef());
+            expectMsgClass(duration, CanCommitTransactionReply.class);
 
             // canCommit the 2nd Tx - it should complete after the 1st Tx times out.
 
-            shard.tell(new CanCommitTransaction(transactionID2).toSerializable(), getRef());
-            expectMsgClass(duration, CanCommitTransactionReply.SERIALIZABLE_CLASS);
+            shard.tell(new CanCommitTransaction(transactionID2, CURRENT_VERSION).toSerializable(), getRef());
+            expectMsgClass(duration, CanCommitTransactionReply.class);
 
             // Try to commit the 1st Tx - should fail as it's not the current Tx.
 
-            shard.tell(new CommitTransaction(transactionID1).toSerializable(), getRef());
+            shard.tell(new CommitTransaction(transactionID1, CURRENT_VERSION).toSerializable(), getRef());
             expectMsgClass(duration, akka.actor.Status.Failure.class);
 
             // Commit the 2nd Tx.
 
-            shard.tell(new CommitTransaction(transactionID2).toSerializable(), getRef());
-            expectMsgClass(duration, CommitTransactionReply.SERIALIZABLE_CLASS);
+            shard.tell(new CommitTransaction(transactionID2, CURRENT_VERSION).toSerializable(), getRef());
+            expectMsgClass(duration, CommitTransactionReply.class);
 
             final NormalizedNode<?, ?> node = readStore(shard, listNodePath);
             assertNotNull(listNodePath + " not found", node);
@@ -1780,16 +1774,16 @@ public class ShardTest extends AbstractShardTest {
 
             // canCommit 1st Tx.
 
-            shard.tell(new CanCommitTransaction(transactionID1).toSerializable(), getRef());
-            expectMsgClass(duration, CanCommitTransactionReply.SERIALIZABLE_CLASS);
+            shard.tell(new CanCommitTransaction(transactionID1, CURRENT_VERSION).toSerializable(), getRef());
+            expectMsgClass(duration, CanCommitTransactionReply.class);
 
             // canCommit the 2nd Tx - it should get queued.
 
-            shard.tell(new CanCommitTransaction(transactionID2).toSerializable(), getRef());
+            shard.tell(new CanCommitTransaction(transactionID2, CURRENT_VERSION).toSerializable(), getRef());
 
             // canCommit the 3rd Tx - should exceed queue capacity and fail.
 
-            shard.tell(new CanCommitTransaction(transactionID3).toSerializable(), getRef());
+            shard.tell(new CanCommitTransaction(transactionID3, CURRENT_VERSION).toSerializable(), getRef());
             expectMsgClass(duration, akka.actor.Status.Failure.class);
         }};
     }
@@ -1836,8 +1830,8 @@ public class ShardTest extends AbstractShardTest {
             // All Tx's are readied. We'll send canCommit for the last one but not the others. The others
             // should expire from the queue and the last one should be processed.
 
-            shard.tell(new CanCommitTransaction(transactionID3).toSerializable(), getRef());
-            expectMsgClass(duration, CanCommitTransactionReply.SERIALIZABLE_CLASS);
+            shard.tell(new CanCommitTransaction(transactionID3, CURRENT_VERSION).toSerializable(), getRef());
+            expectMsgClass(duration, CanCommitTransactionReply.class);
         }};
     }
 
@@ -1866,8 +1860,8 @@ public class ShardTest extends AbstractShardTest {
 
             // CanCommit the first one so it's the current in-progress CohortEntry.
 
-            shard.tell(new CanCommitTransaction(transactionID1).toSerializable(), getRef());
-            expectMsgClass(duration, CanCommitTransactionReply.SERIALIZABLE_CLASS);
+            shard.tell(new CanCommitTransaction(transactionID1, CURRENT_VERSION).toSerializable(), getRef());
+            expectMsgClass(duration, CanCommitTransactionReply.class);
 
             // Ready the second Tx.
 
@@ -1893,12 +1887,12 @@ public class ShardTest extends AbstractShardTest {
             // Commit the first Tx. After completing, the second should expire from the queue and the third
             // Tx committed.
 
-            shard.tell(new CommitTransaction(transactionID1).toSerializable(), getRef());
-            expectMsgClass(duration, CommitTransactionReply.SERIALIZABLE_CLASS);
+            shard.tell(new CommitTransaction(transactionID1, CURRENT_VERSION).toSerializable(), getRef());
+            expectMsgClass(duration, CommitTransactionReply.class);
 
             // Expect commit reply from the third Tx.
 
-            expectMsgClass(duration, CommitTransactionReply.SERIALIZABLE_CLASS);
+            expectMsgClass(duration, CommitTransactionReply.class);
 
             final NormalizedNode<?, ?> node = readStore(shard, TestModel.TEST2_PATH);
             assertNotNull(TestModel.TEST2_PATH + " not found", node);
@@ -1912,7 +1906,7 @@ public class ShardTest extends AbstractShardTest {
                     newShardProps().withDispatcher(Dispatchers.DefaultDispatcherId()),
                     "testCanCommitBeforeReadyFailure");
 
-            shard.tell(new CanCommitTransaction("tx").toSerializable(), getRef());
+            shard.tell(new CanCommitTransaction("tx", CURRENT_VERSION).toSerializable(), getRef());
             expectMsgClass(duration("5 seconds"), akka.actor.Status.Failure.class);
         }};
     }
@@ -1955,22 +1949,22 @@ public class ShardTest extends AbstractShardTest {
 
             // Send the CanCommitTransaction message for the first Tx.
 
-            shard.tell(new CanCommitTransaction(transactionID1).toSerializable(), getRef());
+            shard.tell(new CanCommitTransaction(transactionID1, CURRENT_VERSION).toSerializable(), getRef());
             final CanCommitTransactionReply canCommitReply = CanCommitTransactionReply.fromSerializable(
-                    expectMsgClass(duration, CanCommitTransactionReply.SERIALIZABLE_CLASS));
+                    expectMsgClass(duration, CanCommitTransactionReply.class));
             assertEquals("Can commit", true, canCommitReply.getCanCommit());
 
             // Send the CanCommitTransaction message for the 2nd Tx. This should get queued and
             // processed after the first Tx completes.
 
             final Future<Object> canCommitFuture = Patterns.ask(shard,
-                    new CanCommitTransaction(transactionID2).toSerializable(), timeout);
+                    new CanCommitTransaction(transactionID2, CURRENT_VERSION).toSerializable(), timeout);
 
             // Send the AbortTransaction message for the first Tx. This should trigger the 2nd
             // Tx to proceed.
 
-            shard.tell(new AbortTransaction(transactionID1).toSerializable(), getRef());
-            expectMsgClass(duration, AbortTransactionReply.SERIALIZABLE_CLASS);
+            shard.tell(new AbortTransaction(transactionID1, CURRENT_VERSION).toSerializable(), getRef());
+            expectMsgClass(duration, AbortTransactionReply.class);
 
             // Wait for the 2nd Tx to complete the canCommit phase.
 
@@ -1993,20 +1987,15 @@ public class ShardTest extends AbstractShardTest {
         new ShardTestKit(getSystem()) {{
             final AtomicReference<CountDownLatch> cleaupCheckLatch = new AtomicReference<>();
             @SuppressWarnings("serial")
-            final Creator<Shard> creator = new Creator<Shard>() {
+            final Creator<Shard> creator = () -> new Shard(newShardBuilder()) {
                 @Override
-                public Shard create() throws Exception {
-                    return new Shard(newShardBuilder()) {
-                        @Override
-                        public void onReceiveCommand(final Object message) throws Exception {
-                            super.onReceiveCommand(message);
-                            if(message.equals(TX_COMMIT_TIMEOUT_CHECK_MESSAGE)) {
-                                if(cleaupCheckLatch.get() != null) {
-                                    cleaupCheckLatch.get().countDown();
-                                }
-                            }
+                public void handleCommand(final Object message) {
+                    super.handleCommand(message);
+                    if(TX_COMMIT_TIMEOUT_CHECK_MESSAGE.equals(message)) {
+                        if(cleaupCheckLatch.get() != null) {
+                            cleaupCheckLatch.get().countDown();
                         }
-                    };
+                    }
                 }
             };
 
@@ -2033,8 +2022,8 @@ public class ShardTest extends AbstractShardTest {
 
             // Send the AbortTransaction message.
 
-            shard.tell(new AbortTransaction(transactionID).toSerializable(), getRef());
-            expectMsgClass(duration, AbortTransactionReply.SERIALIZABLE_CLASS);
+            shard.tell(new AbortTransaction(transactionID, CURRENT_VERSION).toSerializable(), getRef());
+            expectMsgClass(duration, AbortTransactionReply.class);
 
             verify(cohort).abort();
 
@@ -2048,7 +2037,7 @@ public class ShardTest extends AbstractShardTest {
 
             // Now send CanCommitTransaction - should fail.
 
-            shard.tell(new CanCommitTransaction(transactionID).toSerializable(), getRef());
+            shard.tell(new CanCommitTransaction(transactionID, CURRENT_VERSION).toSerializable(), getRef());
 
             Throwable failure = expectMsgClass(duration, akka.actor.Status.Failure.class).cause();
             assertTrue("Failure type", failure instanceof IllegalStateException);
@@ -2097,7 +2086,8 @@ public class ShardTest extends AbstractShardTest {
                 public void handleCommand(final Object message) {
                     super.handleCommand(message);
 
-                    if (message instanceof SaveSnapshotSuccess || message.equals("commit_snapshot")) {
+                    // XXX:  commit_snapshot equality check references RaftActorSnapshotMessageSupport.COMMIT_SNAPSHOT
+                    if (message instanceof SaveSnapshotSuccess || "commit_snapshot".equals(message.toString())) {
                         latch.get().countDown();
                     }
                 }
@@ -2108,12 +2098,7 @@ public class ShardTest extends AbstractShardTest {
                 }
             }
 
-            final Creator<Shard> creator = new Creator<Shard>() {
-                @Override
-                public Shard create() throws Exception {
-                    return new TestShard(newShardBuilder());
-                }
-            };
+            final Creator<Shard> creator = () -> new TestShard(newShardBuilder());
 
             final TestActorRef<Shard> shard = actorFactory.createTestActor(
                     Props.create(new DelegatingShardCreator(creator)), shardActorName);
@@ -2121,7 +2106,7 @@ public class ShardTest extends AbstractShardTest {
             waitUntilLeader(shard);
             writeToStore(shard, TestModel.TEST_PATH, ImmutableNodes.containerNode(TestModel.TEST_QNAME));
 
-            final NormalizedNode<?,?> expectedRoot = readStore(shard, YangInstanceIdentifier.builder().build());
+            final NormalizedNode<?,?> expectedRoot = readStore(shard, YangInstanceIdentifier.EMPTY);
 
             // Trigger creation of a snapshot by ensuring
             final RaftActorContext raftActorContext = ((TestShard) shard.underlyingActor()).getRaftActorContext();
@@ -2168,16 +2153,16 @@ public class ShardTest extends AbstractShardTest {
         commitTransaction(store, putTransaction);
 
 
-        final NormalizedNode<?, ?> expected = readStore(store, YangInstanceIdentifier.builder().build());
+        final NormalizedNode<?, ?> expected = readStore(store, YangInstanceIdentifier.EMPTY);
 
         final DataTreeModification writeTransaction = store.takeSnapshot().newModification();
 
-        writeTransaction.delete(YangInstanceIdentifier.builder().build());
-        writeTransaction.write(YangInstanceIdentifier.builder().build(), expected);
+        writeTransaction.delete(YangInstanceIdentifier.EMPTY);
+        writeTransaction.write(YangInstanceIdentifier.EMPTY, expected);
 
         commitTransaction(store, writeTransaction);
 
-        final NormalizedNode<?, ?> actual = readStore(store, YangInstanceIdentifier.builder().build());
+        final NormalizedNode<?, ?> actual = readStore(store, YangInstanceIdentifier.EMPTY);
 
         assertEquals(expected, actual);
     }
@@ -2276,11 +2261,11 @@ public class ShardTest extends AbstractShardTest {
                 newShardProps().withDispatcher(Dispatchers.DefaultDispatcherId()),
                 "testFollowerInitialSyncStatus");
 
-        shard.underlyingActor().onReceiveCommand(new FollowerInitialSyncUpStatus(false, "member-1-shard-inventory-operational"));
+        shard.underlyingActor().handleNonRaftCommand(new FollowerInitialSyncUpStatus(false, "member-1-shard-inventory-operational"));
 
         assertEquals(false, shard.underlyingActor().getShardMBean().getFollowerInitialSyncStatus());
 
-        shard.underlyingActor().onReceiveCommand(new FollowerInitialSyncUpStatus(true, "member-1-shard-inventory-operational"));
+        shard.underlyingActor().handleNonRaftCommand(new FollowerInitialSyncUpStatus(true, "member-1-shard-inventory-operational"));
 
         assertEquals(true, shard.underlyingActor().getShardMBean().getFollowerInitialSyncStatus());
     }
@@ -2289,12 +2274,15 @@ public class ShardTest extends AbstractShardTest {
     public void testClusteredDataChangeListenerDelayedRegistration() throws Exception {
         new ShardTestKit(getSystem()) {{
             String testName = "testClusteredDataChangeListenerDelayedRegistration";
-            dataStoreContextBuilder.shardElectionTimeoutFactor(1000);
+            dataStoreContextBuilder.shardElectionTimeoutFactor(1000).
+                    customRaftPolicyImplementation(DisableElectionsRaftPolicy.class.getName());
 
             final MockDataChangeListener listener = new MockDataChangeListener(1);
             final ActorRef dclActor = actorFactory.createActor(DataChangeListener.props(listener),
                     actorFactory.generateActorId(testName + "-DataChangeListener"));
 
+            setupInMemorySnapshotStore();
+
             final TestActorRef<Shard> shard = actorFactory.createTestActor(
                     newShardBuilder().props().withDispatcher(Dispatchers.DefaultDispatcherId()),
                     actorFactory.generateActorId(testName + "-shard"));
@@ -2308,9 +2296,8 @@ public class ShardTest extends AbstractShardTest {
                 RegisterChangeListenerReply.class);
             assertNotNull("getListenerRegistrationPath", reply.getListenerRegistrationPath());
 
-            writeToStore(shard, path, ImmutableNodes.containerNode(TestModel.TEST_QNAME));
-
-            shard.tell(new ElectionTimeout(), ActorRef.noSender());
+            shard.tell(DatastoreContext.newBuilderFrom(dataStoreContextBuilder.build()).
+                    customRaftPolicyImplementation(null).build(), ActorRef.noSender());
 
             listener.waitForChangeEvents();
         }};
@@ -2320,11 +2307,11 @@ public class ShardTest extends AbstractShardTest {
     public void testClusteredDataChangeListenerRegistration() throws Exception {
         new ShardTestKit(getSystem()) {{
             String testName = "testClusteredDataChangeListenerRegistration";
-            final ShardIdentifier followerShardID = ShardIdentifier.builder().memberName(
-                    actorFactory.generateActorId(testName + "-follower")).shardName("inventory").type("config").build();
+            final ShardIdentifier followerShardID = ShardIdentifier.create("inventory",
+                    MemberName.forName(actorFactory.generateActorId(testName + "-follower")), "config");
 
-            final ShardIdentifier leaderShardID = ShardIdentifier.builder().memberName(
-                    actorFactory.generateActorId(testName + "-leader")).shardName("inventory").type("config").build();
+            final ShardIdentifier leaderShardID = ShardIdentifier.create("inventory",
+                    MemberName.forName(actorFactory.generateActorId(testName + "-leader")), "config");
 
             final TestActorRef<Shard> followerShard = actorFactory.createTestActor(
                     Shard.builder().id(followerShardID).
@@ -2339,7 +2326,7 @@ public class ShardTest extends AbstractShardTest {
                             "akka://test/user/" + followerShardID.toString())).schemaContext(SCHEMA_CONTEXT).props().
                     withDispatcher(Dispatchers.DefaultDispatcherId()), leaderShardID.toString());
 
-            leaderShard.tell(new ElectionTimeout(), ActorRef.noSender());
+            leaderShard.tell(ElectionTimeout.INSTANCE, ActorRef.noSender());
             String leaderPath = waitUntilLeader(followerShard);
             assertEquals("Shard leader path", leaderShard.path().toString(), leaderPath);
 
@@ -2363,12 +2350,15 @@ public class ShardTest extends AbstractShardTest {
     public void testClusteredDataTreeChangeListenerDelayedRegistration() throws Exception {
         new ShardTestKit(getSystem()) {{
             String testName = "testClusteredDataTreeChangeListenerDelayedRegistration";
-            dataStoreContextBuilder.shardElectionTimeoutFactor(1000);
+            dataStoreContextBuilder.shardElectionTimeoutFactor(1000).
+                    customRaftPolicyImplementation(DisableElectionsRaftPolicy.class.getName());
 
             final MockDataTreeChangeListener listener = new MockDataTreeChangeListener(1);
             final ActorRef dclActor = actorFactory.createActor(DataTreeChangeListenerActor.props(listener),
                     actorFactory.generateActorId(testName + "-DataTreeChangeListener"));
 
+            setupInMemorySnapshotStore();
+
             final TestActorRef<Shard> shard = actorFactory.createTestActor(
                     newShardBuilder().props().withDispatcher(Dispatchers.DefaultDispatcherId()),
                     actorFactory.generateActorId(testName + "-shard"));
@@ -2382,9 +2372,8 @@ public class ShardTest extends AbstractShardTest {
                     RegisterDataTreeChangeListenerReply.class);
             assertNotNull("getListenerRegistrationPath", reply.getListenerRegistrationPath());
 
-            writeToStore(shard, path, ImmutableNodes.containerNode(TestModel.TEST_QNAME));
-
-            shard.tell(new ElectionTimeout(), ActorRef.noSender());
+            shard.tell(DatastoreContext.newBuilderFrom(dataStoreContextBuilder.build()).
+                    customRaftPolicyImplementation(null).build(), ActorRef.noSender());
 
             listener.waitForChangeEvents();
         }};
@@ -2394,11 +2383,11 @@ public class ShardTest extends AbstractShardTest {
     public void testClusteredDataTreeChangeListenerRegistration() throws Exception {
         new ShardTestKit(getSystem()) {{
             String testName = "testClusteredDataTreeChangeListenerRegistration";
-            final ShardIdentifier followerShardID = ShardIdentifier.builder().memberName(
-                    actorFactory.generateActorId(testName + "-follower")).shardName("inventory").type("config").build();
+            final ShardIdentifier followerShardID = ShardIdentifier.create("inventory",
+                    MemberName.forName(actorFactory.generateActorId(testName + "-follower")), "config");
 
-            final ShardIdentifier leaderShardID = ShardIdentifier.builder().memberName(
-                    actorFactory.generateActorId(testName + "-leader")).shardName("inventory").type("config").build();
+            final ShardIdentifier leaderShardID = ShardIdentifier.create("inventory",
+                    MemberName.forName(actorFactory.generateActorId(testName + "-leader")), "config");
 
             final TestActorRef<Shard> followerShard = actorFactory.createTestActor(
                     Shard.builder().id(followerShardID).
@@ -2413,7 +2402,7 @@ public class ShardTest extends AbstractShardTest {
                             "akka://test/user/" + followerShardID.toString())).schemaContext(SCHEMA_CONTEXT).props().
                     withDispatcher(Dispatchers.DefaultDispatcherId()), leaderShardID.toString());
 
-            leaderShard.tell(new ElectionTimeout(), ActorRef.noSender());
+            leaderShard.tell(ElectionTimeout.INSTANCE, ActorRef.noSender());
             String leaderPath = waitUntilLeader(followerShard);
             assertEquals("Shard leader path", leaderShard.path().toString(), leaderPath);