BUG 2486 : Optimizations for a single node cluster deployment
[controller.git] / opendaylight / md-sal / sal-distributed-datastore / src / test / java / org / opendaylight / controller / cluster / datastore / ShardTest.java
index f183bb319ee04df852134264ec66a475a53c13ff..2c526288b5ff9353145d4db6dd51d581783111d9 100644 (file)
@@ -1,12 +1,23 @@
 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.assertTrue;
+import static org.junit.Assert.fail;
+import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.inOrder;
+import static org.mockito.Mockito.mock;
+import static org.opendaylight.controller.cluster.datastore.messages.CreateTransaction.CURRENT_VERSION;
 import akka.actor.ActorRef;
+import akka.actor.PoisonPill;
 import akka.actor.Props;
 import akka.dispatch.Dispatchers;
 import akka.dispatch.OnComplete;
 import akka.japi.Creator;
 import akka.pattern.Patterns;
-import akka.testkit.JavaTestKit;
 import akka.testkit.TestActorRef;
 import akka.util.Timeout;
 import com.google.common.base.Function;
@@ -15,8 +26,20 @@ import com.google.common.util.concurrent.CheckedFuture;
 import com.google.common.util.concurrent.Futures;
 import com.google.common.util.concurrent.ListenableFuture;
 import com.google.common.util.concurrent.MoreExecutors;
+import com.google.common.util.concurrent.Uninterruptibles;
+import java.io.IOException;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.atomic.AtomicReference;
 import org.junit.After;
 import org.junit.Before;
+import org.junit.Ignore;
 import org.junit.Test;
 import org.mockito.InOrder;
 import org.mockito.invocation.InvocationOnMock;
@@ -29,7 +52,6 @@ import org.opendaylight.controller.cluster.datastore.messages.CanCommitTransacti
 import org.opendaylight.controller.cluster.datastore.messages.CommitTransaction;
 import org.opendaylight.controller.cluster.datastore.messages.CommitTransactionReply;
 import org.opendaylight.controller.cluster.datastore.messages.CreateTransaction;
-import org.opendaylight.controller.cluster.datastore.messages.EnableNotification;
 import org.opendaylight.controller.cluster.datastore.messages.ForwardedReadyTransaction;
 import org.opendaylight.controller.cluster.datastore.messages.PeerAddressResolved;
 import org.opendaylight.controller.cluster.datastore.messages.ReadyTransactionReply;
@@ -43,6 +65,7 @@ import org.opendaylight.controller.cluster.datastore.modification.WriteModificat
 import org.opendaylight.controller.cluster.datastore.node.NormalizedNodeToNodeCodec;
 import org.opendaylight.controller.cluster.datastore.utils.InMemoryJournal;
 import org.opendaylight.controller.cluster.datastore.utils.InMemorySnapshotStore;
+import org.opendaylight.controller.cluster.datastore.utils.MockDataChangeListener;
 import org.opendaylight.controller.cluster.raft.ReplicatedLogEntry;
 import org.opendaylight.controller.cluster.raft.ReplicatedLogImplEntry;
 import org.opendaylight.controller.cluster.raft.Snapshot;
@@ -50,6 +73,10 @@ import org.opendaylight.controller.cluster.raft.base.messages.ApplyLogEntries;
 import org.opendaylight.controller.cluster.raft.base.messages.ApplySnapshot;
 import org.opendaylight.controller.cluster.raft.base.messages.ApplyState;
 import org.opendaylight.controller.cluster.raft.base.messages.CaptureSnapshot;
+import org.opendaylight.controller.cluster.raft.base.messages.ElectionTimeout;
+import org.opendaylight.controller.cluster.raft.client.messages.FindLeader;
+import org.opendaylight.controller.cluster.raft.client.messages.FindLeaderReply;
+import org.opendaylight.controller.cluster.raft.protobuff.client.messages.CompositeModificationByteStringPayload;
 import org.opendaylight.controller.cluster.raft.protobuff.client.messages.CompositeModificationPayload;
 import org.opendaylight.controller.cluster.raft.protobuff.client.messages.Payload;
 import org.opendaylight.controller.md.cluster.datastore.model.SchemaContextHelper;
@@ -75,44 +102,22 @@ import org.opendaylight.yangtools.yang.model.api.SchemaContext;
 import scala.concurrent.Await;
 import scala.concurrent.Future;
 import scala.concurrent.duration.FiniteDuration;
-import java.io.IOException;
-import java.util.Collections;
-import java.util.HashSet;
-import java.util.Set;
-import java.util.concurrent.CountDownLatch;
-import java.util.concurrent.ExecutionException;
-import java.util.concurrent.TimeUnit;
-import java.util.concurrent.atomic.AtomicInteger;
-import java.util.concurrent.atomic.AtomicReference;
-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.Mockito.mock;
-import static org.mockito.Mockito.doReturn;
-import static org.mockito.Mockito.doAnswer;
-import static org.mockito.Mockito.inOrder;
 
 public class ShardTest extends AbstractActorTest {
 
     private static final SchemaContext SCHEMA_CONTEXT = TestModel.createTestContext();
 
-    private static final ShardIdentifier IDENTIFIER = ShardIdentifier.builder().memberName("member-1")
-            .shardName("inventory").type("config").build();
-
     private static final AtomicInteger NEXT_SHARD_NUM = new AtomicInteger();
 
-    private static String shardName() {
-        return "shard" + NEXT_SHARD_NUM.getAndIncrement();
-    }
+    private final ShardIdentifier shardID = ShardIdentifier.builder().memberName("member-1")
+            .shardName("inventory").type("config" + NEXT_SHARD_NUM.getAndIncrement()).build();
 
     private DatastoreContext dataStoreContext = DatastoreContext.newBuilder().
-            shardJournalRecoveryLogBatchSize(3).shardSnapshotBatchCount(5000).build();
+            shardJournalRecoveryLogBatchSize(3).shardSnapshotBatchCount(5000).
+            shardHeartbeatIntervalInMillis(100).build();
 
     @Before
     public void setUp() {
-        System.setProperty("shard.persistent", "false");
-
         InMemorySnapshotStore.clear();
         InMemoryJournal.clear();
     }
@@ -124,40 +129,149 @@ public class ShardTest extends AbstractActorTest {
     }
 
     private Props newShardProps() {
-        return Shard.props(IDENTIFIER, Collections.<ShardIdentifier,String>emptyMap(),
+        return Shard.props(shardID, Collections.<ShardIdentifier,String>emptyMap(),
                 dataStoreContext, SCHEMA_CONTEXT);
     }
 
     @Test
-    public void testOnReceiveRegisterListener() throws Exception {
-        new JavaTestKit(getSystem()) {{
-            ActorRef subject = getSystem().actorOf(newShardProps(), "testRegisterChangeListener");
+    public void testRegisterChangeListener() throws Exception {
+        new ShardTestKit(getSystem()) {{
+            TestActorRef<Shard> shard = TestActorRef.create(getSystem(),
+                    newShardProps(),  "testRegisterChangeListener");
+
+            waitUntilLeader(shard);
 
-            subject.tell(new UpdateSchemaContext(SchemaContextHelper.full()), getRef());
+            shard.tell(new UpdateSchemaContext(SchemaContextHelper.full()), ActorRef.noSender());
 
-            subject.tell(new RegisterChangeListener(TestModel.TEST_PATH,
-                    getRef().path(), AsyncDataBroker.DataChangeScope.BASE), getRef());
+            MockDataChangeListener listener = new MockDataChangeListener(1);
+            ActorRef dclActor = getSystem().actorOf(DataChangeListener.props(listener),
+                    "testRegisterChangeListener-DataChangeListener");
 
-            EnableNotification enable = expectMsgClass(duration("3 seconds"), EnableNotification.class);
-            assertEquals("isEnabled", false, enable.isEnabled());
+            shard.tell(new RegisterChangeListener(TestModel.TEST_PATH,
+                    dclActor.path(), AsyncDataBroker.DataChangeScope.BASE), getRef());
 
             RegisterChangeListenerReply reply = expectMsgClass(duration("3 seconds"),
                     RegisterChangeListenerReply.class);
-            assertTrue(reply.getListenerRegistrationPath().toString().matches(
+            String replyPath = reply.getListenerRegistrationPath().toString();
+            assertTrue("Incorrect reply path: " + replyPath, replyPath.matches(
                     "akka:\\/\\/test\\/user\\/testRegisterChangeListener\\/\\$.*"));
+
+            YangInstanceIdentifier path = TestModel.TEST_PATH;
+            writeToStore(shard, path, ImmutableNodes.containerNode(TestModel.TEST_QNAME));
+
+            listener.waitForChangeEvents(path);
+
+            dclActor.tell(PoisonPill.getInstance(), ActorRef.noSender());
+            shard.tell(PoisonPill.getInstance(), ActorRef.noSender());
+        }};
+    }
+
+    @SuppressWarnings("serial")
+    @Test
+    public void testChangeListenerNotifiedWhenNotTheLeaderOnRegistration() throws Exception {
+        // This test tests the timing window in which a change listener is registered before the
+        // shard becomes the leader. We verify that the listener is registered and notified of the
+        // existing data when the shard becomes the leader.
+        new ShardTestKit(getSystem()) {{
+            // For this test, we want to send the RegisterChangeListener message after the shard
+            // has recovered from persistence and before it becomes the leader. So we subclass
+            // Shard to override onReceiveCommand and, when the first ElectionTimeout is received,
+            // we know that the shard has been initialized to a follower and has started the
+            // election process. The following 2 CountDownLatches are used to coordinate the
+            // ElectionTimeout with the sending of the RegisterChangeListener message.
+            final CountDownLatch onFirstElectionTimeout = new CountDownLatch(1);
+            final CountDownLatch onChangeListenerRegistered = new CountDownLatch(1);
+            Creator<Shard> creator = new Creator<Shard>() {
+                boolean firstElectionTimeout = true;
+
+                @Override
+                public Shard create() throws Exception {
+                    return new Shard(shardID, Collections.<ShardIdentifier,String>emptyMap(),
+                            dataStoreContext, SCHEMA_CONTEXT) {
+                        @Override
+                        public void onReceiveCommand(final Object message) throws Exception {
+                            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
+                                // message. So we signal the onFirstElectionTimeout latch to tell
+                                // the main thread to send the RegisterChangeListener message and
+                                // start a thread to wait on the onChangeListenerRegistered latch,
+                                // which the main thread signals after it has sent the message.
+                                // After the onChangeListenerRegistered is triggered, we send the
+                                // original ElectionTimeout message to proceed with the election.
+                                firstElectionTimeout = false;
+                                final ActorRef self = getSelf();
+                                new Thread() {
+                                    @Override
+                                    public void run() {
+                                        Uninterruptibles.awaitUninterruptibly(
+                                                onChangeListenerRegistered, 5, TimeUnit.SECONDS);
+                                        self.tell(message, self);
+                                    }
+                                }.start();
+
+                                onFirstElectionTimeout.countDown();
+                            } else {
+                                super.onReceiveCommand(message);
+                            }
+                        }
+                    };
+                }
+            };
+
+            MockDataChangeListener listener = new MockDataChangeListener(1);
+            ActorRef dclActor = getSystem().actorOf(DataChangeListener.props(listener),
+                    "testRegisterChangeListenerWhenNotLeaderInitially-DataChangeListener");
+
+            TestActorRef<Shard> shard = TestActorRef.create(getSystem(),
+                    Props.create(new DelegatingShardCreator(creator)),
+                    "testRegisterChangeListenerWhenNotLeaderInitially");
+
+            // Write initial data into the in-memory store.
+            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,
+                    onFirstElectionTimeout.await(5, TimeUnit.SECONDS));
+
+            // Now send the RegisterChangeListener and wait for the reply.
+            shard.tell(new RegisterChangeListener(path, dclActor.path(),
+                    AsyncDataBroker.DataChangeScope.SUBTREE), getRef());
+
+            RegisterChangeListenerReply reply = expectMsgClass(duration("5 seconds"),
+                    RegisterChangeListenerReply.class);
+            assertNotNull("getListenerRegistrationPath", reply.getListenerRegistrationPath());
+
+            // Sanity check - verify the shard is not the leader yet.
+            shard.tell(new FindLeader(), getRef());
+            FindLeaderReply findLeadeReply =
+                    expectMsgClass(duration("5 seconds"), FindLeaderReply.class);
+            assertNull("Expected the shard not to be the leader", findLeadeReply.getLeaderActor());
+
+            // Signal the onChangeListenerRegistered latch to tell the thread above to proceed
+            // with the election process.
+            onChangeListenerRegistered.countDown();
+
+            // Wait for the shard to become the leader and notify our listener with the existing
+            // data in the store.
+            listener.waitForChangeEvents(path);
+
+            dclActor.tell(PoisonPill.getInstance(), ActorRef.noSender());
+            shard.tell(PoisonPill.getInstance(), ActorRef.noSender());
         }};
     }
 
     @Test
     public void testCreateTransaction(){
         new ShardTestKit(getSystem()) {{
-            ActorRef subject = getSystem().actorOf(newShardProps(), "testCreateTransaction");
+            ActorRef shard = getSystem().actorOf(newShardProps(), "testCreateTransaction");
 
-            waitUntilLeader(subject);
+            waitUntilLeader(shard);
 
-            subject.tell(new UpdateSchemaContext(TestModel.createTestContext()), getRef());
+            shard.tell(new UpdateSchemaContext(TestModel.createTestContext()), getRef());
 
-            subject.tell(new CreateTransaction("txn-1",
+            shard.tell(new CreateTransaction("txn-1",
                     TransactionProxy.TransactionType.READ_ONLY.ordinal() ).toSerializable(), getRef());
 
             CreateTransactionReply reply = expectMsgClass(duration("3 seconds"),
@@ -166,18 +280,19 @@ public class ShardTest extends AbstractActorTest {
             String path = reply.getTransactionActorPath().toString();
             assertTrue("Unexpected transaction path " + path,
                     path.contains("akka://test/user/testCreateTransaction/shard-txn-1"));
-            expectNoMsg();
+
+            shard.tell(PoisonPill.getInstance(), ActorRef.noSender());
         }};
     }
 
     @Test
     public void testCreateTransactionOnChain(){
         new ShardTestKit(getSystem()) {{
-            final ActorRef subject = getSystem().actorOf(newShardProps(), "testCreateTransactionOnChain");
+            final ActorRef shard = getSystem().actorOf(newShardProps(), "testCreateTransactionOnChain");
 
-            waitUntilLeader(subject);
+            waitUntilLeader(shard);
 
-            subject.tell(new CreateTransaction("txn-1",
+            shard.tell(new CreateTransaction("txn-1",
                     TransactionProxy.TransactionType.READ_ONLY.ordinal() , "foobar").toSerializable(),
                     getRef());
 
@@ -187,47 +302,70 @@ public class ShardTest extends AbstractActorTest {
             String path = reply.getTransactionActorPath().toString();
             assertTrue("Unexpected transaction path " + path,
                     path.contains("akka://test/user/testCreateTransactionOnChain/shard-txn-1"));
-            expectNoMsg();
+
+            shard.tell(PoisonPill.getInstance(), ActorRef.noSender());
         }};
     }
 
+    @SuppressWarnings("serial")
     @Test
-    public void testPeerAddressResolved(){
-        new JavaTestKit(getSystem()) {{
-            final ShardIdentifier identifier =
-                ShardIdentifier.builder().memberName("member-1")
-                    .shardName("inventory").type("config").build();
-
-            Props props = Shard.props(identifier,
-                    Collections.<ShardIdentifier, String>singletonMap(identifier, null),
-                    dataStoreContext, SCHEMA_CONTEXT);
-            final ActorRef subject = getSystem().actorOf(props, "testPeerAddressResolved");
-
-            new Within(duration("3 seconds")) {
-                @Override
-                protected void run() {
+    public void testPeerAddressResolved() throws Exception {
+        new ShardTestKit(getSystem()) {{
+            final CountDownLatch recoveryComplete = new CountDownLatch(1);
+            class TestShard extends Shard {
+                TestShard() {
+                    super(shardID, Collections.<ShardIdentifier, String>singletonMap(shardID, null),
+                            dataStoreContext, SCHEMA_CONTEXT);
+                }
 
-                    subject.tell(
-                        new PeerAddressResolved(identifier, "akka://foobar"),
-                        getRef());
+                Map<String, String> getPeerAddresses() {
+                    return getRaftActorContext().getPeerAddresses();
+                }
 
-                    expectNoMsg();
+                @Override
+                protected void onRecoveryComplete() {
+                    try {
+                        super.onRecoveryComplete();
+                    } finally {
+                        recoveryComplete.countDown();
+                    }
                 }
-            };
+            }
+
+            final TestActorRef<Shard> shard = TestActorRef.create(getSystem(),
+                    Props.create(new DelegatingShardCreator(new Creator<Shard>() {
+                        @Override
+                        public TestShard create() throws Exception {
+                            return new TestShard();
+                        }
+                    })), "testPeerAddressResolved");
+
+            //waitUntilLeader(shard);
+            assertEquals("Recovery complete", true,
+                    Uninterruptibles.awaitUninterruptibly(recoveryComplete, 5, TimeUnit.SECONDS));
+
+            String address = "akka://foobar";
+            shard.underlyingActor().onReceiveCommand(new PeerAddressResolved(shardID, address));
+
+            assertEquals("getPeerAddresses", address,
+                    ((TestShard)shard.underlyingActor()).getPeerAddresses().get(shardID.toString()));
+
+            shard.tell(PoisonPill.getInstance(), ActorRef.noSender());
         }};
     }
 
     @Test
-    public void testApplySnapshot() throws ExecutionException, InterruptedException {
-        TestActorRef<Shard> ref = TestActorRef.create(getSystem(), newShardProps());
+    public void testApplySnapshot() throws Exception {
+        TestActorRef<Shard> shard = TestActorRef.create(getSystem(), newShardProps(),
+                "testApplySnapshot");
 
         NormalizedNodeToNodeCodec codec =
             new NormalizedNodeToNodeCodec(SCHEMA_CONTEXT);
 
-        writeToStore(ref, TestModel.TEST_PATH, ImmutableNodes.containerNode(TestModel.TEST_QNAME));
+        writeToStore(shard, TestModel.TEST_PATH, ImmutableNodes.containerNode(TestModel.TEST_QNAME));
 
         YangInstanceIdentifier root = YangInstanceIdentifier.builder().build();
-        NormalizedNode<?,?> expected = readStore(ref, root);
+        NormalizedNode<?,?> expected = readStore(shard, root);
 
         NormalizedNodeMessages.Container encode = codec.encode(expected);
 
@@ -235,17 +373,19 @@ public class ShardTest extends AbstractActorTest {
                 encode.getNormalizedNode().toByteString().toByteArray(),
                 Collections.<ReplicatedLogEntry>emptyList(), 1, 2, 3, 4));
 
-        ref.underlyingActor().onReceiveCommand(applySnapshot);
+        shard.underlyingActor().onReceiveCommand(applySnapshot);
 
-        NormalizedNode<?,?> actual = readStore(ref, root);
+        NormalizedNode<?,?> actual = readStore(shard, root);
 
         assertEquals(expected, actual);
+
+        shard.tell(PoisonPill.getInstance(), ActorRef.noSender());
     }
 
     @Test
     public void testApplyState() throws Exception {
 
-        TestActorRef<Shard> shard = TestActorRef.create(getSystem(), newShardProps());
+        TestActorRef<Shard> shard = TestActorRef.create(getSystem(), newShardProps(), "testApplyState");
 
         NormalizedNode<?, ?> node = ImmutableNodes.containerNode(TestModel.TEST_QNAME);
 
@@ -259,6 +399,8 @@ public class ShardTest extends AbstractActorTest {
 
         NormalizedNode<?,?> actual = readStore(shard, TestModel.TEST_PATH);
         assertEquals("Applied state", node, actual);
+
+        shard.tell(PoisonPill.getInstance(), ActorRef.noSender());
     }
 
     @SuppressWarnings("serial")
@@ -279,7 +421,7 @@ public class ShardTest extends AbstractActorTest {
         DOMStoreReadTransaction readTx = testStore.newReadOnlyTransaction();
         NormalizedNode<?, ?> root = readTx.read(YangInstanceIdentifier.builder().build()).get().get();
 
-        InMemorySnapshotStore.addSnapshot(IDENTIFIER.toString(), Snapshot.create(
+        InMemorySnapshotStore.addSnapshot(shardID.toString(), Snapshot.create(
                 new NormalizedNodeToNodeCodec(SCHEMA_CONTEXT).encode(
                         root).
                                 getNormalizedNode().toByteString().toByteArray(),
@@ -287,25 +429,38 @@ public class ShardTest extends AbstractActorTest {
 
         // Set up the InMemoryJournal.
 
-        InMemoryJournal.addEntry(IDENTIFIER.toString(), 0, new ReplicatedLogImplEntry(0, 1, newPayload(
+        InMemoryJournal.addEntry(shardID.toString(), 0, new ReplicatedLogImplEntry(0, 1, newPayload(
                   new WriteModification(TestModel.OUTER_LIST_PATH,
                           ImmutableNodes.mapNodeBuilder(TestModel.OUTER_LIST_QNAME).build(),
                           SCHEMA_CONTEXT))));
 
-        int nListEntries = 11;
+        int nListEntries = 16;
         Set<Integer> listEntryKeys = new HashSet<>();
-        for(int i = 1; i <= nListEntries; i++) {
+        for(int i = 1; i <= nListEntries-5; i++) {
             listEntryKeys.add(Integer.valueOf(i));
             YangInstanceIdentifier path = YangInstanceIdentifier.builder(TestModel.OUTER_LIST_PATH)
                     .nodeWithKey(TestModel.OUTER_LIST_QNAME, TestModel.ID_QNAME, i).build();
             Modification mod = new MergeModification(path,
                     ImmutableNodes.mapEntry(TestModel.OUTER_LIST_QNAME, TestModel.ID_QNAME, i),
                     SCHEMA_CONTEXT);
-            InMemoryJournal.addEntry(IDENTIFIER.toString(), i, new ReplicatedLogImplEntry(i, 1,
+            InMemoryJournal.addEntry(shardID.toString(), i, new ReplicatedLogImplEntry(i, 1,
                     newPayload(mod)));
         }
 
-        InMemoryJournal.addEntry(IDENTIFIER.toString(), nListEntries + 1,
+        // Add some of the new CompositeModificationByteStringPayload
+        for(int i = 11; i <= nListEntries; i++) {
+            listEntryKeys.add(Integer.valueOf(i));
+            YangInstanceIdentifier path = YangInstanceIdentifier.builder(TestModel.OUTER_LIST_PATH)
+                    .nodeWithKey(TestModel.OUTER_LIST_QNAME, TestModel.ID_QNAME, i).build();
+            Modification mod = new MergeModification(path,
+                    ImmutableNodes.mapEntry(TestModel.OUTER_LIST_QNAME, TestModel.ID_QNAME, i),
+                    SCHEMA_CONTEXT);
+            InMemoryJournal.addEntry(shardID.toString(), i, new ReplicatedLogImplEntry(i, 1,
+                    newByteStringPayload(mod)));
+        }
+
+
+        InMemoryJournal.addEntry(shardID.toString(), nListEntries + 1,
                 new ApplyLogEntries(nListEntries));
 
         // Create the actor and wait for recovery complete.
@@ -315,7 +470,7 @@ public class ShardTest extends AbstractActorTest {
         Creator<Shard> creator = new Creator<Shard>() {
             @Override
             public Shard create() throws Exception {
-                return new Shard(IDENTIFIER, Collections.<ShardIdentifier,String>emptyMap(),
+                return new Shard(shardID, Collections.<ShardIdentifier,String>emptyMap(),
                         dataStoreContext, SCHEMA_CONTEXT) {
                     @Override
                     protected void onRecoveryComplete() {
@@ -363,9 +518,11 @@ public class ShardTest extends AbstractActorTest {
                 shard.underlyingActor().getShardMBean().getCommitIndex());
         assertEquals("Last applied", nListEntries,
                 shard.underlyingActor().getShardMBean().getLastApplied());
+
+        shard.tell(PoisonPill.getInstance(), ActorRef.noSender());
     }
 
-    private CompositeModificationPayload newPayload(Modification... mods) {
+    private CompositeModificationPayload newPayload(final Modification... mods) {
         MutableCompositeModification compMod = new MutableCompositeModification();
         for(Modification mod: mods) {
             compMod.addModification(mod);
@@ -374,15 +531,25 @@ public class ShardTest extends AbstractActorTest {
         return new CompositeModificationPayload(compMod.toSerializable());
     }
 
-    private DOMStoreThreePhaseCommitCohort setupMockWriteTransaction(String cohortName,
-            InMemoryDOMDataStore dataStore, YangInstanceIdentifier path, NormalizedNode data,
-            MutableCompositeModification modification) {
+    private CompositeModificationByteStringPayload newByteStringPayload(final Modification... mods) {
+        MutableCompositeModification compMod = new MutableCompositeModification();
+        for(Modification mod: mods) {
+            compMod.addModification(mod);
+        }
+
+        return new CompositeModificationByteStringPayload(compMod.toSerializable());
+    }
+
+
+    private DOMStoreThreePhaseCommitCohort setupMockWriteTransaction(final String cohortName,
+            final InMemoryDOMDataStore dataStore, final YangInstanceIdentifier path, final NormalizedNode<?, ?> data,
+            final MutableCompositeModification modification) {
         return setupMockWriteTransaction(cohortName, dataStore, path, data, modification, null);
     }
 
-    private DOMStoreThreePhaseCommitCohort setupMockWriteTransaction(String cohortName,
-            InMemoryDOMDataStore dataStore, YangInstanceIdentifier path, NormalizedNode data,
-            MutableCompositeModification modification,
+    private DOMStoreThreePhaseCommitCohort setupMockWriteTransaction(final String cohortName,
+            final InMemoryDOMDataStore dataStore, final YangInstanceIdentifier path, final NormalizedNode<?, ?> data,
+            final MutableCompositeModification modification,
             final Function<DOMStoreThreePhaseCommitCohort,ListenableFuture<Void>> preCommit) {
 
         DOMStoreWriteTransaction tx = dataStore.newWriteOnlyTransaction();
@@ -392,14 +559,14 @@ public class ShardTest extends AbstractActorTest {
 
         doAnswer(new Answer<ListenableFuture<Boolean>>() {
             @Override
-            public ListenableFuture<Boolean> answer(InvocationOnMock invocation) {
+            public ListenableFuture<Boolean> answer(final InvocationOnMock invocation) {
                 return realCohort.canCommit();
             }
         }).when(cohort).canCommit();
 
         doAnswer(new Answer<ListenableFuture<Void>>() {
             @Override
-            public ListenableFuture<Void> answer(InvocationOnMock invocation) throws Throwable {
+            public ListenableFuture<Void> answer(final InvocationOnMock invocation) throws Throwable {
                 if(preCommit != null) {
                     return preCommit.apply(realCohort);
                 } else {
@@ -410,14 +577,14 @@ public class ShardTest extends AbstractActorTest {
 
         doAnswer(new Answer<ListenableFuture<Void>>() {
             @Override
-            public ListenableFuture<Void> answer(InvocationOnMock invocation) throws Throwable {
+            public ListenableFuture<Void> answer(final InvocationOnMock invocation) throws Throwable {
                 return realCohort.commit();
             }
         }).when(cohort).commit();
 
         doAnswer(new Answer<ListenableFuture<Void>>() {
             @Override
-            public ListenableFuture<Void> answer(InvocationOnMock invocation) throws Throwable {
+            public ListenableFuture<Void> answer(final InvocationOnMock invocation) throws Throwable {
                 return realCohort.abort();
             }
         }).when(cohort).abort();
@@ -430,10 +597,10 @@ public class ShardTest extends AbstractActorTest {
     @SuppressWarnings({ "unchecked" })
     @Test
     public void testConcurrentThreePhaseCommits() throws Throwable {
-        System.setProperty("shard.persistent", "true");
         new ShardTestKit(getSystem()) {{
             final TestActorRef<Shard> shard = TestActorRef.create(getSystem(),
-                    newShardProps().withDispatcher(Dispatchers.DefaultDispatcherId()), shardName());
+                    newShardProps().withDispatcher(Dispatchers.DefaultDispatcherId()),
+                    "testConcurrentThreePhaseCommits");
 
             waitUntilLeader(shard);
 
@@ -468,7 +635,8 @@ public class ShardTest extends AbstractActorTest {
             // Simulate the ForwardedReadyTransaction message for the first Tx that would be sent
             // by the ShardTransaction.
 
-            shard.tell(new ForwardedReadyTransaction(transactionID1, cohort1, modification1, true), getRef());
+            shard.tell(new ForwardedReadyTransaction(transactionID1, CURRENT_VERSION,
+                    cohort1, modification1, true), getRef());
             ReadyTransactionReply readyReply = ReadyTransactionReply.fromSerializable(
                     expectMsgClass(duration, ReadyTransactionReply.SERIALIZABLE_CLASS));
             assertEquals("Cohort path", shard.path().toString(), readyReply.getCohortPath());
@@ -482,10 +650,12 @@ public class ShardTest extends AbstractActorTest {
 
             // Send the ForwardedReadyTransaction for the next 2 Tx's.
 
-            shard.tell(new ForwardedReadyTransaction(transactionID2, cohort2, modification2, true), getRef());
+            shard.tell(new ForwardedReadyTransaction(transactionID2, CURRENT_VERSION,
+                    cohort2, modification2, true), getRef());
             expectMsgClass(duration, ReadyTransactionReply.SERIALIZABLE_CLASS);
 
-            shard.tell(new ForwardedReadyTransaction(transactionID3, cohort3, modification3, true), getRef());
+            shard.tell(new ForwardedReadyTransaction(transactionID3, CURRENT_VERSION,
+                    cohort3, modification3, true), getRef());
             expectMsgClass(duration, ReadyTransactionReply.SERIALIZABLE_CLASS);
 
             // Send the CanCommitTransaction message for the next 2 Tx's. These should get queued and
@@ -511,14 +681,13 @@ public class ShardTest extends AbstractActorTest {
             class OnFutureComplete extends OnComplete<Object> {
                 private final Class<?> expRespType;
 
-                OnFutureComplete(Class<?> expRespType) {
+                OnFutureComplete(final Class<?> expRespType) {
                     this.expRespType = expRespType;
                 }
 
                 @Override
-                public void onComplete(Throwable error, Object resp) {
+                public void onComplete(final Throwable error, final Object resp) {
                     if(error != null) {
-                        System.out.println(new java.util.Date()+": "+getClass().getSimpleName() + " failure: "+error);
                         caughtEx.set(new AssertionError(getClass().getSimpleName() + " failure", error));
                     } else {
                         try {
@@ -530,7 +699,7 @@ public class ShardTest extends AbstractActorTest {
                     }
                 }
 
-                void onSuccess(Object resp) throws Exception {
+                void onSuccess(final Object resp) throws Exception {
                 }
             }
 
@@ -540,7 +709,7 @@ public class ShardTest extends AbstractActorTest {
                 }
 
                 @Override
-                public void onComplete(Throwable error, Object resp) {
+                public void onComplete(final Throwable error, final Object resp) {
                     super.onComplete(error, resp);
                     commitLatch.countDown();
                 }
@@ -549,13 +718,13 @@ public class ShardTest extends AbstractActorTest {
             class OnCanCommitFutureComplete extends OnFutureComplete {
                 private final String transactionID;
 
-                OnCanCommitFutureComplete(String transactionID) {
+                OnCanCommitFutureComplete(final String transactionID) {
                     super(CanCommitTransactionReply.SERIALIZABLE_CLASS);
                     this.transactionID = transactionID;
                 }
 
                 @Override
-                void onSuccess(Object resp) throws Exception {
+                void onSuccess(final Object resp) throws Exception {
                     CanCommitTransactionReply canCommitReply =
                             CanCommitTransactionReply.fromSerializable(resp);
                     assertEquals("Can commit", true, canCommitReply.getCanCommit());
@@ -606,7 +775,17 @@ public class ShardTest extends AbstractActorTest {
             assertTrue("Missing leaf " + TestModel.ID_QNAME.getLocalName(), idLeaf.isPresent());
             assertEquals(TestModel.ID_QNAME.getLocalName() + " value", 1, idLeaf.get().getValue());
 
+            for(int i = 0; i < 20 * 5; i++) {
+                long lastLogIndex = shard.underlyingActor().getShardMBean().getLastLogIndex();
+                if(lastLogIndex == 2) {
+                    break;
+                }
+                Uninterruptibles.sleepUninterruptibly(50, TimeUnit.MILLISECONDS);
+            }
+
             assertEquals("Last log index", 2, shard.underlyingActor().getShardMBean().getLastLogIndex());
+
+            shard.tell(PoisonPill.getInstance(), ActorRef.noSender());
         }};
     }
 
@@ -614,7 +793,8 @@ public class ShardTest extends AbstractActorTest {
     public void testCommitPhaseFailure() throws Throwable {
         new ShardTestKit(getSystem()) {{
             final TestActorRef<Shard> shard = TestActorRef.create(getSystem(),
-                    newShardProps().withDispatcher(Dispatchers.DefaultDispatcherId()), shardName());
+                    newShardProps().withDispatcher(Dispatchers.DefaultDispatcherId()),
+                    "testCommitPhaseFailure");
 
             waitUntilLeader(shard);
 
@@ -639,10 +819,12 @@ public class ShardTest extends AbstractActorTest {
             // Simulate the ForwardedReadyTransaction messages that would be sent
             // by the ShardTransaction.
 
-            shard.tell(new ForwardedReadyTransaction(transactionID1, cohort1, modification1, true), getRef());
+            shard.tell(new ForwardedReadyTransaction(transactionID1, CURRENT_VERSION,
+                    cohort1, modification1, true), getRef());
             expectMsgClass(duration, ReadyTransactionReply.SERIALIZABLE_CLASS);
 
-            shard.tell(new ForwardedReadyTransaction(transactionID2, cohort2, modification2, true), getRef());
+            shard.tell(new ForwardedReadyTransaction(transactionID2, CURRENT_VERSION,
+                    cohort2, modification2, true), getRef());
             expectMsgClass(duration, ReadyTransactionReply.SERIALIZABLE_CLASS);
 
             // Send the CanCommitTransaction message for the first Tx.
@@ -669,7 +851,7 @@ public class ShardTest extends AbstractActorTest {
             final CountDownLatch latch = new CountDownLatch(1);
             canCommitFuture.onComplete(new OnComplete<Object>() {
                 @Override
-                public void onComplete(Throwable t, Object resp) {
+                public void onComplete(final Throwable t, final Object resp) {
                     latch.countDown();
                 }
             }, getSystem().dispatcher());
@@ -681,6 +863,8 @@ public class ShardTest extends AbstractActorTest {
             inOrder.verify(cohort1).preCommit();
             inOrder.verify(cohort1).commit();
             inOrder.verify(cohort2).canCommit();
+
+            shard.tell(PoisonPill.getInstance(), ActorRef.noSender());
         }};
     }
 
@@ -688,7 +872,8 @@ public class ShardTest extends AbstractActorTest {
     public void testPreCommitPhaseFailure() throws Throwable {
         new ShardTestKit(getSystem()) {{
             final TestActorRef<Shard> shard = TestActorRef.create(getSystem(),
-                    newShardProps().withDispatcher(Dispatchers.DefaultDispatcherId()), shardName());
+                    newShardProps().withDispatcher(Dispatchers.DefaultDispatcherId()),
+                    "testPreCommitPhaseFailure");
 
             waitUntilLeader(shard);
 
@@ -703,7 +888,8 @@ public class ShardTest extends AbstractActorTest {
             // Simulate the ForwardedReadyTransaction messages that would be sent
             // by the ShardTransaction.
 
-            shard.tell(new ForwardedReadyTransaction(transactionID, cohort, modification, true), getRef());
+            shard.tell(new ForwardedReadyTransaction(transactionID, CURRENT_VERSION,
+                    cohort, modification, true), getRef());
             expectMsgClass(duration, ReadyTransactionReply.SERIALIZABLE_CLASS);
 
             // Send the CanCommitTransaction message.
@@ -722,6 +908,8 @@ public class ShardTest extends AbstractActorTest {
             InOrder inOrder = inOrder(cohort);
             inOrder.verify(cohort).canCommit();
             inOrder.verify(cohort).preCommit();
+
+            shard.tell(PoisonPill.getInstance(), ActorRef.noSender());
         }};
     }
 
@@ -729,7 +917,8 @@ public class ShardTest extends AbstractActorTest {
     public void testCanCommitPhaseFailure() throws Throwable {
         new ShardTestKit(getSystem()) {{
             final TestActorRef<Shard> shard = TestActorRef.create(getSystem(),
-                    newShardProps().withDispatcher(Dispatchers.DefaultDispatcherId()), shardName());
+                    newShardProps().withDispatcher(Dispatchers.DefaultDispatcherId()),
+                    "testCanCommitPhaseFailure");
 
             waitUntilLeader(shard);
 
@@ -743,22 +932,26 @@ public class ShardTest extends AbstractActorTest {
             // Simulate the ForwardedReadyTransaction messages that would be sent
             // by the ShardTransaction.
 
-            shard.tell(new ForwardedReadyTransaction(transactionID, cohort, modification, true), getRef());
+            shard.tell(new ForwardedReadyTransaction(transactionID, CURRENT_VERSION,
+                    cohort, modification, true), getRef());
             expectMsgClass(duration, ReadyTransactionReply.SERIALIZABLE_CLASS);
 
             // Send the CanCommitTransaction message.
 
             shard.tell(new CanCommitTransaction(transactionID).toSerializable(), getRef());
             expectMsgClass(duration, akka.actor.Status.Failure.class);
+
+            shard.tell(PoisonPill.getInstance(), ActorRef.noSender());
         }};
     }
 
     @Test
+    @Ignore("This test will work only if replication is turned on. Needs modification due to optimizations added to Shard/RaftActor.")
     public void testAbortBeforeFinishCommit() throws Throwable {
-        System.setProperty("shard.persistent", "true");
         new ShardTestKit(getSystem()) {{
             final TestActorRef<Shard> shard = TestActorRef.create(getSystem(),
-                    newShardProps().withDispatcher(Dispatchers.DefaultDispatcherId()), shardName());
+                    newShardProps().withDispatcher(Dispatchers.DefaultDispatcherId()),
+                    "testAbortBeforeFinishCommit");
 
             waitUntilLeader(shard);
 
@@ -779,7 +972,7 @@ public class ShardTest extends AbstractActorTest {
                             new AbortTransaction(transactionID).toSerializable(), timeout);
                     abortFuture.onComplete(new OnComplete<Object>() {
                         @Override
-                        public void onComplete(Throwable e, Object resp) {
+                        public void onComplete(final Throwable e, final Object resp) {
                             abortComplete.countDown();
                         }
                     }, getSystem().dispatcher());
@@ -793,7 +986,8 @@ public class ShardTest extends AbstractActorTest {
                     TestModel.TEST_PATH, ImmutableNodes.containerNode(TestModel.TEST_QNAME),
                     modification, preCommit);
 
-            shard.tell(new ForwardedReadyTransaction(transactionID, cohort, modification, true), getRef());
+            shard.tell(new ForwardedReadyTransaction(transactionID, CURRENT_VERSION,
+                    cohort, modification, true), getRef());
             expectMsgClass(duration, ReadyTransactionReply.SERIALIZABLE_CLASS);
 
             shard.tell(new CanCommitTransaction(transactionID).toSerializable(), getRef());
@@ -810,6 +1004,8 @@ public class ShardTest extends AbstractActorTest {
 
             NormalizedNode<?, ?> node = readStore(shard, TestModel.TEST_PATH);
             assertNotNull(TestModel.TEST_QNAME.getLocalName() + " not found", node);
+
+            shard.tell(PoisonPill.getInstance(), ActorRef.noSender());
         }};
     }
 
@@ -819,7 +1015,8 @@ public class ShardTest extends AbstractActorTest {
 
         new ShardTestKit(getSystem()) {{
             final TestActorRef<Shard> shard = TestActorRef.create(getSystem(),
-                    newShardProps().withDispatcher(Dispatchers.DefaultDispatcherId()), shardName());
+                    newShardProps().withDispatcher(Dispatchers.DefaultDispatcherId()),
+                    "testTransactionCommitTimeout");
 
             waitUntilLeader(shard);
 
@@ -854,10 +1051,12 @@ public class ShardTest extends AbstractActorTest {
 
             // Ready the Tx's
 
-            shard.tell(new ForwardedReadyTransaction(transactionID1, cohort1, modification1, true), getRef());
+            shard.tell(new ForwardedReadyTransaction(transactionID1, CURRENT_VERSION,
+                    cohort1, modification1, true), getRef());
             expectMsgClass(duration, ReadyTransactionReply.SERIALIZABLE_CLASS);
 
-            shard.tell(new ForwardedReadyTransaction(transactionID2, cohort2, modification2, true), getRef());
+            shard.tell(new ForwardedReadyTransaction(transactionID2, CURRENT_VERSION,
+                    cohort2, modification2, true), getRef());
             expectMsgClass(duration, ReadyTransactionReply.SERIALIZABLE_CLASS);
 
             // canCommit 1st Tx. We don't send the commit so it should timeout.
@@ -877,6 +1076,8 @@ public class ShardTest extends AbstractActorTest {
 
             NormalizedNode<?, ?> node = readStore(shard, listNodePath);
             assertNotNull(listNodePath + " not found", node);
+
+            shard.tell(PoisonPill.getInstance(), ActorRef.noSender());
         }};
     }
 
@@ -886,7 +1087,8 @@ public class ShardTest extends AbstractActorTest {
 
         new ShardTestKit(getSystem()) {{
             final TestActorRef<Shard> shard = TestActorRef.create(getSystem(),
-                    newShardProps().withDispatcher(Dispatchers.DefaultDispatcherId()), shardName());
+                    newShardProps().withDispatcher(Dispatchers.DefaultDispatcherId()),
+                    "testTransactionCommitQueueCapacityExceeded");
 
             waitUntilLeader(shard);
 
@@ -913,13 +1115,16 @@ public class ShardTest extends AbstractActorTest {
 
             // Ready the Tx's
 
-            shard.tell(new ForwardedReadyTransaction(transactionID1, cohort1, modification1, true), getRef());
+            shard.tell(new ForwardedReadyTransaction(transactionID1, CURRENT_VERSION,
+                    cohort1, modification1, true), getRef());
             expectMsgClass(duration, ReadyTransactionReply.SERIALIZABLE_CLASS);
 
-            shard.tell(new ForwardedReadyTransaction(transactionID2, cohort2, modification2, true), getRef());
+            shard.tell(new ForwardedReadyTransaction(transactionID2, CURRENT_VERSION,
+                    cohort2, modification2, true), getRef());
             expectMsgClass(duration, ReadyTransactionReply.SERIALIZABLE_CLASS);
 
-            shard.tell(new ForwardedReadyTransaction(transactionID3, cohort3, modification3, true), getRef());
+            shard.tell(new ForwardedReadyTransaction(transactionID3, CURRENT_VERSION,
+                    cohort3, modification3, true), getRef());
             expectMsgClass(duration, ReadyTransactionReply.SERIALIZABLE_CLASS);
 
             // canCommit 1st Tx.
@@ -935,6 +1140,8 @@ public class ShardTest extends AbstractActorTest {
 
             shard.tell(new CanCommitTransaction(transactionID3).toSerializable(), getRef());
             expectMsgClass(duration, akka.actor.Status.Failure.class);
+
+            shard.tell(PoisonPill.getInstance(), ActorRef.noSender());
         }};
     }
 
@@ -942,10 +1149,13 @@ public class ShardTest extends AbstractActorTest {
     public void testCanCommitBeforeReadyFailure() throws Throwable {
         new ShardTestKit(getSystem()) {{
             final TestActorRef<Shard> shard = TestActorRef.create(getSystem(),
-                    newShardProps().withDispatcher(Dispatchers.DefaultDispatcherId()), shardName());
+                    newShardProps().withDispatcher(Dispatchers.DefaultDispatcherId()),
+                    "testCanCommitBeforeReadyFailure");
 
             shard.tell(new CanCommitTransaction("tx").toSerializable(), getRef());
             expectMsgClass(duration("5 seconds"), akka.actor.Status.Failure.class);
+
+            shard.tell(PoisonPill.getInstance(), ActorRef.noSender());
         }};
     }
 
@@ -953,7 +1163,8 @@ public class ShardTest extends AbstractActorTest {
     public void testAbortTransaction() throws Throwable {
         new ShardTestKit(getSystem()) {{
             final TestActorRef<Shard> shard = TestActorRef.create(getSystem(),
-                    newShardProps().withDispatcher(Dispatchers.DefaultDispatcherId()), shardName());
+                    newShardProps().withDispatcher(Dispatchers.DefaultDispatcherId()),
+                    "testAbortTransaction");
 
             waitUntilLeader(shard);
 
@@ -976,10 +1187,12 @@ public class ShardTest extends AbstractActorTest {
             // Simulate the ForwardedReadyTransaction messages that would be sent
             // by the ShardTransaction.
 
-            shard.tell(new ForwardedReadyTransaction(transactionID1, cohort1, modification1, true), getRef());
+            shard.tell(new ForwardedReadyTransaction(transactionID1, CURRENT_VERSION,
+                    cohort1, modification1, true), getRef());
             expectMsgClass(duration, ReadyTransactionReply.SERIALIZABLE_CLASS);
 
-            shard.tell(new ForwardedReadyTransaction(transactionID2, cohort2, modification2, true), getRef());
+            shard.tell(new ForwardedReadyTransaction(transactionID2, CURRENT_VERSION,
+                    cohort2, modification2, true), getRef());
             expectMsgClass(duration, ReadyTransactionReply.SERIALIZABLE_CLASS);
 
             // Send the CanCommitTransaction message for the first Tx.
@@ -1006,7 +1219,7 @@ public class ShardTest extends AbstractActorTest {
             final CountDownLatch latch = new CountDownLatch(1);
             canCommitFuture.onComplete(new OnComplete<Object>() {
                 @Override
-                public void onComplete(Throwable t, Object resp) {
+                public void onComplete(final Throwable t, final Object resp) {
                     latch.countDown();
                 }
             }, getSystem().dispatcher());
@@ -1016,21 +1229,36 @@ public class ShardTest extends AbstractActorTest {
             InOrder inOrder = inOrder(cohort1, cohort2);
             inOrder.verify(cohort1).canCommit();
             inOrder.verify(cohort2).canCommit();
+
+            shard.tell(PoisonPill.getInstance(), ActorRef.noSender());
         }};
     }
 
     @Test
     public void testCreateSnapshot() throws IOException, InterruptedException {
+            testCreateSnapshot(true, "testCreateSnapshot");
+    }
+
+    @Test
+    public void testCreateSnapshotWithNonPersistentData() throws IOException, InterruptedException {
+        testCreateSnapshot(false, "testCreateSnapshotWithNonPersistentData");
+    }
+
+    @SuppressWarnings("serial")
+    public void testCreateSnapshot(final boolean persistent, final String shardActorName) throws IOException, InterruptedException {
+        final DatastoreContext dataStoreContext = DatastoreContext.newBuilder().
+                shardJournalRecoveryLogBatchSize(3).shardSnapshotBatchCount(5000).persistent(persistent).build();
+
         new ShardTestKit(getSystem()) {{
             final AtomicReference<CountDownLatch> latch = new AtomicReference<>(new CountDownLatch(1));
             Creator<Shard> creator = new Creator<Shard>() {
                 @Override
                 public Shard create() throws Exception {
-                    return new Shard(IDENTIFIER, Collections.<ShardIdentifier,String>emptyMap(),
+                    return new Shard(shardID, Collections.<ShardIdentifier,String>emptyMap(),
                             dataStoreContext, SCHEMA_CONTEXT) {
                         @Override
-                        public void saveSnapshot(Object snapshot) {
-                            super.saveSnapshot(snapshot);
+                        protected void commitSnapshot(final long sequenceNumber) {
+                            super.commitSnapshot(sequenceNumber);
                             latch.get().countDown();
                         }
                     };
@@ -1038,7 +1266,7 @@ public class ShardTest extends AbstractActorTest {
             };
 
             TestActorRef<Shard> shard = TestActorRef.create(getSystem(),
-                    Props.create(new DelegatingShardCreator(creator)), "testCreateSnapshot");
+                    Props.create(new DelegatingShardCreator(creator)), shardActorName);
 
             waitUntilLeader(shard);
 
@@ -1050,6 +1278,8 @@ public class ShardTest extends AbstractActorTest {
             shard.tell(new CaptureSnapshot(-1,-1,-1,-1), getRef());
 
             assertEquals("Snapshot saved", true, latch.get().await(5, TimeUnit.SECONDS));
+
+            shard.tell(PoisonPill.getInstance(), ActorRef.noSender());
         }};
     }
 
@@ -1059,8 +1289,7 @@ public class ShardTest extends AbstractActorTest {
      */
     @Test
     public void testInMemoryDataStoreRestore() throws ReadFailedException {
-        InMemoryDOMDataStore store = new InMemoryDOMDataStore("test", MoreExecutors.listeningDecorator(
-            MoreExecutors.sameThreadExecutor()), MoreExecutors.sameThreadExecutor());
+        InMemoryDOMDataStore store = new InMemoryDOMDataStore("test", MoreExecutors.sameThreadExecutor());
 
         store.onGlobalContextUpdated(SCHEMA_CONTEXT);
 
@@ -1070,7 +1299,7 @@ public class ShardTest extends AbstractActorTest {
         commitTransaction(putTransaction);
 
 
-        NormalizedNode expected = readStore(store);
+        NormalizedNode<?, ?> expected = readStore(store);
 
         DOMStoreWriteTransaction writeTransaction = store.newWriteOnlyTransaction();
 
@@ -1079,13 +1308,47 @@ public class ShardTest extends AbstractActorTest {
 
         commitTransaction(writeTransaction);
 
-        NormalizedNode actual = readStore(store);
+        NormalizedNode<?, ?> actual = readStore(store);
 
         assertEquals(expected, actual);
+    }
+
+    @Test
+    public void testRecoveryApplicable(){
+
+        final DatastoreContext persistentContext = DatastoreContext.newBuilder().
+                shardJournalRecoveryLogBatchSize(3).shardSnapshotBatchCount(5000).persistent(true).build();
+
+        final Props persistentProps = Shard.props(shardID, Collections.<ShardIdentifier, String>emptyMap(),
+                persistentContext, SCHEMA_CONTEXT);
+
+        final DatastoreContext nonPersistentContext = DatastoreContext.newBuilder().
+                shardJournalRecoveryLogBatchSize(3).shardSnapshotBatchCount(5000).persistent(false).build();
+
+        final Props nonPersistentProps = Shard.props(shardID, Collections.<ShardIdentifier, String>emptyMap(),
+                nonPersistentContext, SCHEMA_CONTEXT);
+
+        new ShardTestKit(getSystem()) {{
+            TestActorRef<Shard> shard1 = TestActorRef.create(getSystem(),
+                    persistentProps, "testPersistence1");
+
+            assertTrue("Recovery Applicable", shard1.underlyingActor().getDataPersistenceProvider().isRecoveryApplicable());
+
+            shard1.tell(PoisonPill.getInstance(), ActorRef.noSender());
+
+            TestActorRef<Shard> shard2 = TestActorRef.create(getSystem(),
+                    nonPersistentProps, "testPersistence2");
+
+            assertFalse("Recovery Not Applicable", shard2.underlyingActor().getDataPersistenceProvider().isRecoveryApplicable());
+
+            shard2.tell(PoisonPill.getInstance(), ActorRef.noSender());
+
+        }};
 
     }
 
-    private NormalizedNode readStore(InMemoryDOMDataStore store) throws ReadFailedException {
+
+    private NormalizedNode<?, ?> readStore(final InMemoryDOMDataStore store) throws ReadFailedException {
         DOMStoreReadTransaction transaction = store.newReadOnlyTransaction();
         CheckedFuture<Optional<NormalizedNode<?, ?>>, ReadFailedException> read =
             transaction.read(YangInstanceIdentifier.builder().build());
@@ -1099,7 +1362,7 @@ public class ShardTest extends AbstractActorTest {
         return normalizedNode;
     }
 
-    private void commitTransaction(DOMStoreWriteTransaction transaction) {
+    private void commitTransaction(final DOMStoreWriteTransaction transaction) {
         DOMStoreThreePhaseCommitCohort commitCohort = transaction.ready();
         ListenableFuture<Void> future =
             commitCohort.preCommit();
@@ -1115,13 +1378,13 @@ public class ShardTest extends AbstractActorTest {
         return new AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>>() {
             @Override
             public void onDataChanged(
-                AsyncDataChangeEvent<YangInstanceIdentifier, NormalizedNode<?, ?>> change) {
+                final AsyncDataChangeEvent<YangInstanceIdentifier, NormalizedNode<?, ?>> change) {
 
             }
         };
     }
 
-    private NormalizedNode<?,?> readStore(TestActorRef<Shard> shard, YangInstanceIdentifier id)
+    static NormalizedNode<?,?> readStore(final TestActorRef<Shard> shard, final YangInstanceIdentifier id)
             throws ExecutionException, InterruptedException {
         DOMStoreReadTransaction transaction = shard.underlyingActor().getDataStore().newReadOnlyTransaction();
 
@@ -1136,7 +1399,7 @@ public class ShardTest extends AbstractActorTest {
         return node;
     }
 
-    private void writeToStore(TestActorRef<Shard> shard, YangInstanceIdentifier id, NormalizedNode<?,?> node)
+    private void writeToStore(final TestActorRef<Shard> shard, final YangInstanceIdentifier id, final NormalizedNode<?,?> node)
         throws ExecutionException, InterruptedException {
         DOMStoreWriteTransaction transaction = shard.underlyingActor().getDataStore().newWriteOnlyTransaction();
 
@@ -1147,10 +1410,11 @@ public class ShardTest extends AbstractActorTest {
         commitCohort.commit().get();
     }
 
+    @SuppressWarnings("serial")
     private static final class DelegatingShardCreator implements Creator<Shard> {
         private final Creator<Shard> delegate;
 
-        DelegatingShardCreator(Creator<Shard> delegate) {
+        DelegatingShardCreator(final Creator<Shard> delegate) {
             this.delegate = delegate;
         }