Eliminate use of deprecated mockito methods
[controller.git] / opendaylight / md-sal / sal-akka-raft / src / test / java / org / opendaylight / controller / cluster / raft / RaftActorTest.java
index d57c354e5a0fbf7f4dcdcca4bb3c246763d6db4a..2c975ecf08e1d5aecdd13685f0be90ad4b3eed7e 100644 (file)
@@ -5,20 +5,17 @@
  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
  * and is available at http://www.eclipse.org/legal/epl-v10.html
  */
-
 package org.opendaylight.controller.cluster.raft;
 
-import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertNotSame;
 import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertSame;
 import static org.junit.Assert.assertTrue;
-import static org.mockito.Matchers.any;
-import static org.mockito.Matchers.anyObject;
-import static org.mockito.Matchers.eq;
-import static org.mockito.Matchers.same;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.ArgumentMatchers.same;
 import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.never;
@@ -28,7 +25,6 @@ import static org.mockito.Mockito.verify;
 
 import akka.actor.ActorRef;
 import akka.actor.PoisonPill;
-import akka.actor.Props;
 import akka.actor.Status.Failure;
 import akka.actor.Terminated;
 import akka.dispatch.Dispatchers;
@@ -37,14 +33,15 @@ import akka.persistence.SaveSnapshotFailure;
 import akka.persistence.SaveSnapshotSuccess;
 import akka.persistence.SnapshotMetadata;
 import akka.persistence.SnapshotOffer;
-import akka.testkit.JavaTestKit;
+import akka.protobuf.ByteString;
 import akka.testkit.TestActorRef;
+import akka.testkit.javadsl.TestKit;
 import com.google.common.base.Optional;
 import com.google.common.collect.ImmutableMap;
 import com.google.common.util.concurrent.Uninterruptibles;
-import com.google.protobuf.ByteString;
 import java.io.ByteArrayOutputStream;
 import java.io.ObjectOutputStream;
+import java.time.Duration;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
@@ -53,7 +50,6 @@ import java.util.List;
 import java.util.Map;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
-import org.apache.commons.lang3.SerializationUtils;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
@@ -63,10 +59,10 @@ import org.opendaylight.controller.cluster.NonPersistentDataProvider;
 import org.opendaylight.controller.cluster.PersistentDataProvider;
 import org.opendaylight.controller.cluster.notifications.LeaderStateChanged;
 import org.opendaylight.controller.cluster.notifications.RoleChanged;
+import org.opendaylight.controller.cluster.raft.MockRaftActor.MockSnapshotState;
 import org.opendaylight.controller.cluster.raft.MockRaftActorContext.MockPayload;
 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.CaptureSnapshotReply;
 import org.opendaylight.controller.cluster.raft.base.messages.LeaderTransitioning;
 import org.opendaylight.controller.cluster.raft.base.messages.SendHeartBeat;
@@ -79,10 +75,13 @@ import org.opendaylight.controller.cluster.raft.client.messages.GetSnapshotReply
 import org.opendaylight.controller.cluster.raft.messages.AppendEntries;
 import org.opendaylight.controller.cluster.raft.messages.AppendEntriesReply;
 import org.opendaylight.controller.cluster.raft.persisted.ApplyJournalEntries;
+import org.opendaylight.controller.cluster.raft.persisted.ByteState;
 import org.opendaylight.controller.cluster.raft.persisted.DeleteEntries;
+import org.opendaylight.controller.cluster.raft.persisted.EmptyState;
 import org.opendaylight.controller.cluster.raft.persisted.ServerConfigurationPayload;
 import org.opendaylight.controller.cluster.raft.persisted.ServerInfo;
 import org.opendaylight.controller.cluster.raft.persisted.SimpleReplicatedLogEntry;
+import org.opendaylight.controller.cluster.raft.persisted.Snapshot;
 import org.opendaylight.controller.cluster.raft.persisted.UpdateElectionTerm;
 import org.opendaylight.controller.cluster.raft.policy.DisableElectionsRaftPolicy;
 import org.opendaylight.controller.cluster.raft.utils.InMemoryJournal;
@@ -91,7 +90,6 @@ import org.opendaylight.controller.cluster.raft.utils.MessageCollectorActor;
 import org.opendaylight.yangtools.concepts.Identifier;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-import scala.concurrent.duration.Duration;
 import scala.concurrent.duration.FiniteDuration;
 
 public class RaftActorTest extends AbstractActorTest {
@@ -106,7 +104,7 @@ public class RaftActorTest extends AbstractActorTest {
     }
 
     @After
-    public void tearDown() throws Exception {
+    public void tearDown() {
         factory.close();
         InMemoryJournal.clear();
         InMemorySnapshotStore.clear();
@@ -125,10 +123,10 @@ public class RaftActorTest extends AbstractActorTest {
 
 
     @Test
-    public void testRaftActorRecoveryWithPersistenceEnabled() throws Exception {
+    public void testRaftActorRecoveryWithPersistenceEnabled() {
         TEST_LOG.info("testRaftActorRecoveryWithPersistenceEnabled starting");
 
-        JavaTestKit kit = new JavaTestKit(getSystem());
+        TestKit kit = new TestKit(getSystem());
         String persistenceId = factory.generateActorId("follower-");
 
         DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
@@ -146,33 +144,28 @@ public class RaftActorTest extends AbstractActorTest {
         kit.watch(followerActor);
 
         List<ReplicatedLogEntry> snapshotUnappliedEntries = new ArrayList<>();
-        ReplicatedLogEntry entry1 = new MockRaftActorContext.MockReplicatedLogEntry(1, 4,
-                new MockRaftActorContext.MockPayload("E"));
+        ReplicatedLogEntry entry1 = new SimpleReplicatedLogEntry(4, 1, new MockRaftActorContext.MockPayload("E"));
         snapshotUnappliedEntries.add(entry1);
 
         int lastAppliedDuringSnapshotCapture = 3;
         int lastIndexDuringSnapshotCapture = 4;
 
         // 4 messages as part of snapshot, which are applied to state
-        ByteString snapshotBytes = fromObject(Arrays.asList(
+        MockSnapshotState snapshotState = new MockSnapshotState(Arrays.asList(
                 new MockRaftActorContext.MockPayload("A"),
                 new MockRaftActorContext.MockPayload("B"),
                 new MockRaftActorContext.MockPayload("C"),
                 new MockRaftActorContext.MockPayload("D")));
 
-        Snapshot snapshot = Snapshot.create(snapshotBytes.toByteArray(),
-                snapshotUnappliedEntries, lastIndexDuringSnapshotCapture, 1,
-                lastAppliedDuringSnapshotCapture, 1);
+        Snapshot snapshot = Snapshot.create(snapshotState, snapshotUnappliedEntries, lastIndexDuringSnapshotCapture, 1,
+                lastAppliedDuringSnapshotCapture, 1, -1, null, null);
         InMemorySnapshotStore.addSnapshot(persistenceId, snapshot);
 
         // add more entries after snapshot is taken
         List<ReplicatedLogEntry> entries = new ArrayList<>();
-        ReplicatedLogEntry entry2 = new MockRaftActorContext.MockReplicatedLogEntry(1, 5,
-                new MockRaftActorContext.MockPayload("F", 2));
-        ReplicatedLogEntry entry3 = new MockRaftActorContext.MockReplicatedLogEntry(1, 6,
-                new MockRaftActorContext.MockPayload("G", 3));
-        ReplicatedLogEntry entry4 = new MockRaftActorContext.MockReplicatedLogEntry(1, 7,
-                new MockRaftActorContext.MockPayload("H", 4));
+        ReplicatedLogEntry entry2 = new SimpleReplicatedLogEntry(5, 1, new MockRaftActorContext.MockPayload("F", 2));
+        ReplicatedLogEntry entry3 = new SimpleReplicatedLogEntry(6, 1, new MockRaftActorContext.MockPayload("G", 3));
+        ReplicatedLogEntry entry4 = new SimpleReplicatedLogEntry(7, 1, new MockRaftActorContext.MockPayload("H", 4));
         entries.add(entry2);
         entries.add(entry3);
         entries.add(entry4);
@@ -188,7 +181,7 @@ public class RaftActorTest extends AbstractActorTest {
 
         // kill the actor
         followerActor.tell(PoisonPill.getInstance(), null);
-        kit.expectMsgClass(JavaTestKit.duration("5 seconds"), Terminated.class);
+        kit.expectMsgClass(Duration.ofSeconds(5), Terminated.class);
 
         kit.unwatch(followerActor);
 
@@ -217,7 +210,7 @@ public class RaftActorTest extends AbstractActorTest {
     }
 
     @Test
-    public void testRaftActorRecoveryWithPersistenceDisabled() throws Exception {
+    public void testRaftActorRecoveryWithPersistenceDisabled() {
         String persistenceId = factory.generateActorId("follower-");
 
         DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
@@ -226,7 +219,7 @@ public class RaftActorTest extends AbstractActorTest {
 
         TestActorRef<MockRaftActor> ref = factory.createTestActor(MockRaftActor.props(persistenceId,
                 ImmutableMap.<String, String>builder().put("member1", "address").build(),
-                config, new NonPersistentDataProvider()), persistenceId);
+                config, createProvider()), persistenceId);
 
         MockRaftActor mockRaftActor = ref.underlyingActor();
 
@@ -238,8 +231,8 @@ public class RaftActorTest extends AbstractActorTest {
     }
 
     @Test
-    public void testUpdateElectionTermPersistedWithPersistenceDisabled() throws Exception {
-        final JavaTestKit kit = new JavaTestKit(getSystem());
+    public void testUpdateElectionTermPersistedWithPersistenceDisabled() {
+        final TestKit kit = new TestKit(getSystem());
         String persistenceId = factory.generateActorId("follower-");
         DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
         config.setHeartBeatInterval(new FiniteDuration(100, TimeUnit.MILLISECONDS));
@@ -249,7 +242,7 @@ public class RaftActorTest extends AbstractActorTest {
 
         TestActorRef<MockRaftActor> ref = factory.createTestActor(MockRaftActor.props(persistenceId,
                 ImmutableMap.<String, String>builder().put("member1", "address").build(),
-                config, new NonPersistentDataProvider())
+                config, createProvider())
                 .withDispatcher(Dispatchers.DefaultDispatcherId()), persistenceId);
 
         InMemoryJournal.waitForWriteMessagesComplete(persistenceId);
@@ -262,7 +255,7 @@ public class RaftActorTest extends AbstractActorTest {
         config.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
         ref = factory.createTestActor(MockRaftActor.props(persistenceId,
                 ImmutableMap.<String, String>builder().put("member1", "address").build(), config,
-                new NonPersistentDataProvider()).withDispatcher(Dispatchers.DefaultDispatcherId()),
+                createProvider()).withDispatcher(Dispatchers.DefaultDispatcherId()),
                 factory.generateActorId("follower-"));
 
         MockRaftActor actor = ref.underlyingActor();
@@ -294,14 +287,14 @@ public class RaftActorTest extends AbstractActorTest {
         mockRaftActor.waitForRecoveryComplete();
 
         RaftActorRecoverySupport mockSupport = mock(RaftActorRecoverySupport.class);
-        mockRaftActor.setRaftActorRecoverySupport(mockSupport );
+        mockRaftActor.setRaftActorRecoverySupport(mockSupport);
 
-        Snapshot snapshot = Snapshot.create(new byte[]{1}, Collections.<ReplicatedLogEntry>emptyList(), 3, 1, 3, 1);
+        Snapshot snapshot = Snapshot.create(ByteState.of(new byte[]{1}),
+                Collections.<ReplicatedLogEntry>emptyList(), 3, 1, 3, 1, -1, null, null);
         SnapshotOffer snapshotOffer = new SnapshotOffer(new SnapshotMetadata("test", 6, 12345), snapshot);
         mockRaftActor.handleRecover(snapshotOffer);
 
-        MockRaftActorContext.MockReplicatedLogEntry logEntry = new MockRaftActorContext.MockReplicatedLogEntry(1,
-                1, new MockRaftActorContext.MockPayload("1", 5));
+        ReplicatedLogEntry logEntry = new SimpleReplicatedLogEntry(1, 1, new MockRaftActorContext.MockPayload("1", 5));
         mockRaftActor.handleRecover(logEntry);
 
         ApplyJournalEntries applyJournalEntries = new ApplyJournalEntries(2);
@@ -342,11 +335,8 @@ public class RaftActorTest extends AbstractActorTest {
         doReturn(true).when(mockSupport).handleSnapshotMessage(same(applySnapshot), any(ActorRef.class));
         mockRaftActor.handleCommand(applySnapshot);
 
-        CaptureSnapshot captureSnapshot = new CaptureSnapshot(1, 1, 1, 1, 0, 1, null);
-        doReturn(true).when(mockSupport).handleSnapshotMessage(same(captureSnapshot), any(ActorRef.class));
-        mockRaftActor.handleCommand(captureSnapshot);
-
-        CaptureSnapshotReply captureSnapshotReply = new CaptureSnapshotReply(new byte[0]);
+        CaptureSnapshotReply captureSnapshotReply = new CaptureSnapshotReply(ByteState.empty(),
+                java.util.Optional.empty());
         doReturn(true).when(mockSupport).handleSnapshotMessage(same(captureSnapshotReply), any(ActorRef.class));
         mockRaftActor.handleCommand(captureSnapshotReply);
 
@@ -367,7 +357,6 @@ public class RaftActorTest extends AbstractActorTest {
         mockRaftActor.handleCommand(GetSnapshot.INSTANCE);
 
         verify(mockSupport).handleSnapshotMessage(same(applySnapshot), any(ActorRef.class));
-        verify(mockSupport).handleSnapshotMessage(same(captureSnapshot), any(ActorRef.class));
         verify(mockSupport).handleSnapshotMessage(same(captureSnapshotReply), any(ActorRef.class));
         verify(mockSupport).handleSnapshotMessage(same(saveSnapshotSuccess), any(ActorRef.class));
         verify(mockSupport).handleSnapshotMessage(same(saveSnapshotFailure), any(ActorRef.class));
@@ -402,7 +391,7 @@ public class RaftActorTest extends AbstractActorTest {
     }
 
     @Test
-    public void testApplyState() throws Exception {
+    public void testApplyState() {
         String persistenceId = factory.generateActorId("leader-");
 
         DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
@@ -418,19 +407,17 @@ public class RaftActorTest extends AbstractActorTest {
 
         mockRaftActor.waitForInitializeBehaviorComplete();
 
-        ReplicatedLogEntry entry = new MockRaftActorContext.MockReplicatedLogEntry(1, 5,
-                new MockRaftActorContext.MockPayload("F"));
+        ReplicatedLogEntry entry = new SimpleReplicatedLogEntry(5, 1, new MockRaftActorContext.MockPayload("F"));
 
         final Identifier id = new MockIdentifier("apply-state");
-        mockRaftActor.onReceiveCommand(new ApplyState(mockActorRef, id, entry));
+        mockRaftActor.getRaftActorContext().getApplyStateConsumer().accept(new ApplyState(mockActorRef, id, entry));
 
-        verify(mockRaftActor.actorDelegate).applyState(eq(mockActorRef), eq(id), anyObject());
+        verify(mockRaftActor.actorDelegate).applyState(eq(mockActorRef), eq(id), any());
     }
 
     @Test
     public void testRaftRoleChangeNotifierWhenRaftActorHasNoPeers() throws Exception {
-        TestActorRef<MessageCollectorActor> notifierActor = factory.createTestActor(
-                Props.create(MessageCollectorActor.class));
+        ActorRef notifierActor = factory.createActor(MessageCollectorActor.props());
         MessageCollectorActor.waitUntilReady(notifierActor);
 
         DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
@@ -442,7 +429,7 @@ public class RaftActorTest extends AbstractActorTest {
 
         final TestActorRef<MockRaftActor> raftActorRef = factory.createTestActor(MockRaftActor.builder()
                 .id(persistenceId).config(config).roleChangeNotifier(notifierActor).dataPersistenceProvider(
-                        new NonPersistentDataProvider()).props().withDispatcher(Dispatchers.DefaultDispatcherId()),
+                    createProvider()).props().withDispatcher(Dispatchers.DefaultDispatcherId()),
                 persistenceId);
 
         List<RoleChanged> matches =  MessageCollectorActor.expectMatching(notifierActor, RoleChanged.class, 3);
@@ -472,14 +459,14 @@ public class RaftActorTest extends AbstractActorTest {
         assertEquals(raftRoleChanged.getMemberId(), leaderStateChange.getLeaderId());
         assertEquals(MockRaftActor.PAYLOAD_VERSION, leaderStateChange.getLeaderPayloadVersion());
 
-        notifierActor.underlyingActor().clear();
+        MessageCollectorActor.clearMessages(notifierActor);
 
         MockRaftActor raftActor = raftActorRef.underlyingActor();
         final String newLeaderId = "new-leader";
         final short newLeaderVersion = 6;
         Follower follower = new Follower(raftActor.getRaftActorContext()) {
             @Override
-            public RaftActorBehavior handleMessage(ActorRef sender, Object message) {
+            public RaftActorBehavior handleMessage(final ActorRef sender, final Object message) {
                 setLeaderId(newLeaderId);
                 setLeaderPayloadVersion(newLeaderVersion);
                 return this;
@@ -496,7 +483,7 @@ public class RaftActorTest extends AbstractActorTest {
         assertEquals(RaftState.Leader.name(), raftRoleChanged.getOldRole());
         assertEquals(RaftState.Follower.name(), raftRoleChanged.getNewRole());
 
-        notifierActor.underlyingActor().clear();
+        MessageCollectorActor.clearMessages(notifierActor);
 
         raftActor.handleCommand("any");
 
@@ -505,7 +492,7 @@ public class RaftActorTest extends AbstractActorTest {
         assertEquals(newLeaderId, leaderStateChange.getLeaderId());
         assertEquals(newLeaderVersion, leaderStateChange.getLeaderPayloadVersion());
 
-        notifierActor.underlyingActor().clear();
+        MessageCollectorActor.clearMessages(notifierActor);
 
         raftActor.handleCommand("any");
 
@@ -516,7 +503,7 @@ public class RaftActorTest extends AbstractActorTest {
 
     @Test
     public void testRaftRoleChangeNotifierWhenRaftActorHasPeers() throws Exception {
-        ActorRef notifierActor = factory.createActor(Props.create(MessageCollectorActor.class));
+        ActorRef notifierActor = factory.createActor(MessageCollectorActor.props());
         MessageCollectorActor.waitUntilReady(notifierActor);
 
         DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
@@ -561,8 +548,7 @@ public class RaftActorTest extends AbstractActorTest {
         final String persistenceId = factory.generateActorId("leader-");
         final String follower1Id = factory.generateActorId("follower-");
 
-        ActorRef followerActor1 =
-                factory.createActor(Props.create(MessageCollectorActor.class));
+        ActorRef followerActor1 = factory.createActor(MessageCollectorActor.props());
 
         DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
         config.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
@@ -596,9 +582,9 @@ public class RaftActorTest extends AbstractActorTest {
         assertEquals(8, leaderActor.getReplicatedLog().size());
 
         leaderActor.getRaftActorContext().getSnapshotManager().capture(
-                new MockRaftActorContext.MockReplicatedLogEntry(1, 6, new MockRaftActorContext.MockPayload("x")), 4);
+                new SimpleReplicatedLogEntry(6, 1, new MockRaftActorContext.MockPayload("x")), 4);
 
-        verify(leaderActor.snapshotCohortDelegate).createSnapshot(any(ActorRef.class));
+        verify(leaderActor.snapshotCohortDelegate).createSnapshot(any(), any());
 
         assertEquals(8, leaderActor.getReplicatedLog().size());
 
@@ -617,14 +603,14 @@ public class RaftActorTest extends AbstractActorTest {
 
         assertEquals(8, leaderActor.getReplicatedLog().size());
 
-        ByteString snapshotBytes = fromObject(Arrays.asList(
+        MockSnapshotState snapshotState = new MockSnapshotState(Arrays.asList(
                 new MockRaftActorContext.MockPayload("foo-0"),
                 new MockRaftActorContext.MockPayload("foo-1"),
                 new MockRaftActorContext.MockPayload("foo-2"),
                 new MockRaftActorContext.MockPayload("foo-3"),
                 new MockRaftActorContext.MockPayload("foo-4")));
 
-        leaderActor.getRaftActorContext().getSnapshotManager().persist(snapshotBytes.toByteArray(),
+        leaderActor.getRaftActorContext().getSnapshotManager().persist(snapshotState, java.util.Optional.empty(),
                 Runtime.getRuntime().totalMemory());
 
         assertTrue(leaderActor.getRaftActorContext().getSnapshotManager().isCapturing());
@@ -651,9 +637,7 @@ public class RaftActorTest extends AbstractActorTest {
         final String persistenceId = factory.generateActorId("follower-");
         final String leaderId = factory.generateActorId("leader-");
 
-
-        ActorRef leaderActor1 =
-                factory.createActor(Props.create(MessageCollectorActor.class));
+        ActorRef leaderActor1 = factory.createActor(MessageCollectorActor.props());
 
         DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
         config.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
@@ -688,30 +672,23 @@ public class RaftActorTest extends AbstractActorTest {
 
         //snapshot on 4
         followerActor.getRaftActorContext().getSnapshotManager().capture(
-                new MockRaftActorContext.MockReplicatedLogEntry(1, 5,
-                        new MockRaftActorContext.MockPayload("D")), 4);
+                new SimpleReplicatedLogEntry(5, 1, new MockRaftActorContext.MockPayload("D")), 4);
 
-        verify(followerActor.snapshotCohortDelegate).createSnapshot(any(ActorRef.class));
+        verify(followerActor.snapshotCohortDelegate).createSnapshot(any(), any());
 
         assertEquals(6, followerActor.getReplicatedLog().size());
 
         //fake snapshot on index 6
-        List<ReplicatedLogEntry> entries =
-                Arrays.asList(
-                        (ReplicatedLogEntry) new MockRaftActorContext.MockReplicatedLogEntry(1, 6,
-                                new MockRaftActorContext.MockPayload("foo-6"))
-                        );
+        List<ReplicatedLogEntry> entries = Arrays.asList(
+                (ReplicatedLogEntry) new SimpleReplicatedLogEntry(6, 1, new MockRaftActorContext.MockPayload("foo-6")));
         followerActor.onReceiveCommand(new AppendEntries(1, leaderId, 5, 1, entries, 5, 5, (short)0));
         assertEquals(7, followerActor.getReplicatedLog().size());
 
         //fake snapshot on index 7
         assertEquals(RaftState.Follower, followerActor.getCurrentBehavior().state());
 
-        entries =
-                Arrays.asList(
-                        (ReplicatedLogEntry) new MockRaftActorContext.MockReplicatedLogEntry(1, 7,
-                                new MockRaftActorContext.MockPayload("foo-7"))
-                        );
+        entries = Arrays.asList((ReplicatedLogEntry) new SimpleReplicatedLogEntry(7, 1,
+                new MockRaftActorContext.MockPayload("foo-7")));
         followerActor.onReceiveCommand(new AppendEntries(1, leaderId, 6, 1, entries, 6, 6, (short) 0));
         assertEquals(8, followerActor.getReplicatedLog().size());
 
@@ -724,7 +701,8 @@ public class RaftActorTest extends AbstractActorTest {
                 new MockRaftActorContext.MockPayload("foo-2"),
                 new MockRaftActorContext.MockPayload("foo-3"),
                 new MockRaftActorContext.MockPayload("foo-4")));
-        followerActor.onReceiveCommand(new CaptureSnapshotReply(snapshotBytes.toByteArray()));
+        followerActor.onReceiveCommand(new CaptureSnapshotReply(ByteState.of(snapshotBytes.toByteArray()),
+                java.util.Optional.empty()));
         assertTrue(followerActor.getRaftActorContext().getSnapshotManager().isCapturing());
 
         // The commit is needed to complete the snapshot creation process
@@ -734,11 +712,8 @@ public class RaftActorTest extends AbstractActorTest {
         assertEquals(3, followerActor.getReplicatedLog().size()); //indexes 5,6,7 left in the log
         assertEquals(7, followerActor.getReplicatedLog().lastIndex());
 
-        entries =
-                Arrays.asList(
-                        (ReplicatedLogEntry) new MockRaftActorContext.MockReplicatedLogEntry(1, 8,
-                                new MockRaftActorContext.MockPayload("foo-7"))
-                        );
+        entries = Arrays.asList((ReplicatedLogEntry) new SimpleReplicatedLogEntry(8, 1,
+                new MockRaftActorContext.MockPayload("foo-7")));
         // send an additional entry 8 with leaderCommit = 7
         followerActor.onReceiveCommand(new AppendEntries(1, leaderId, 7, 1, entries, 7, 7, (short) 0));
 
@@ -752,8 +727,8 @@ public class RaftActorTest extends AbstractActorTest {
         final String follower1Id = factory.generateActorId("follower-");
         final String follower2Id = factory.generateActorId("follower-");
 
-        final ActorRef followerActor1 = factory.createActor(Props.create(MessageCollectorActor.class), follower1Id);
-        final ActorRef followerActor2 = factory.createActor(Props.create(MessageCollectorActor.class), follower2Id);
+        final ActorRef followerActor1 = factory.createActor(MessageCollectorActor.props(), follower1Id);
+        final ActorRef followerActor2 = factory.createActor(MessageCollectorActor.props(), follower2Id);
 
         DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
         config.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
@@ -818,7 +793,8 @@ public class RaftActorTest extends AbstractActorTest {
                 new MockRaftActorContext.MockPayload("foo-2"),
                 new MockRaftActorContext.MockPayload("foo-3"),
                 new MockRaftActorContext.MockPayload("foo-4")));
-        leaderActor.onReceiveCommand(new CaptureSnapshotReply(snapshotBytes.toByteArray()));
+        leaderActor.onReceiveCommand(new CaptureSnapshotReply(ByteState.of(snapshotBytes.toByteArray()),
+                java.util.Optional.empty()));
         assertTrue(leaderActor.getRaftActorContext().getSnapshotManager().isCapturing());
 
         assertEquals("Real snapshot didn't clear the log till replicatedToAllIndex", 0,
@@ -837,7 +813,7 @@ public class RaftActorTest extends AbstractActorTest {
         config.setIsolatedLeaderCheckInterval(new FiniteDuration(1, TimeUnit.DAYS));
         config.setSnapshotBatchCount(5);
 
-        DataPersistenceProvider dataPersistenceProvider = new NonPersistentDataProvider();
+        DataPersistenceProvider dataPersistenceProvider = createProvider();
 
         Map<String, String> peerAddresses = ImmutableMap.<String, String>builder().put("member1", "address").build();
 
@@ -851,7 +827,7 @@ public class RaftActorTest extends AbstractActorTest {
 
         leaderActor.waitForInitializeBehaviorComplete();
         for (int i = 0; i < 4; i++) {
-            leaderActor.getReplicatedLog().append(new MockRaftActorContext.MockReplicatedLogEntry(1, i,
+            leaderActor.getReplicatedLog().append(new SimpleReplicatedLogEntry(i, 1,
                     new MockRaftActorContext.MockPayload("A")));
         }
 
@@ -864,7 +840,8 @@ public class RaftActorTest extends AbstractActorTest {
                 leaderActor.getReplicatedLog().last(), -1, "member1");
 
         // Now send a CaptureSnapshotReply
-        mockActorRef.tell(new CaptureSnapshotReply(fromObject("foo").toByteArray()), mockActorRef);
+        mockActorRef.tell(new CaptureSnapshotReply(ByteState.of(fromObject("foo").toByteArray()),
+                java.util.Optional.empty()), mockActorRef);
 
         // Trimming log in this scenario is a no-op
         assertEquals(-1, leaderActor.getReplicatedLog().getSnapshotIndex());
@@ -880,7 +857,7 @@ public class RaftActorTest extends AbstractActorTest {
         config.setIsolatedLeaderCheckInterval(new FiniteDuration(1, TimeUnit.DAYS));
         config.setSnapshotBatchCount(5);
 
-        DataPersistenceProvider dataPersistenceProvider = new NonPersistentDataProvider();
+        DataPersistenceProvider dataPersistenceProvider = createProvider();
 
         Map<String, String> peerAddresses = ImmutableMap.<String, String>builder().put("member1", "address").build();
 
@@ -901,10 +878,11 @@ public class RaftActorTest extends AbstractActorTest {
 
         // Persist another entry (this will cause a CaptureSnapshot to be triggered
         leaderActor.persistData(mockActorRef, new MockIdentifier("x"),
-                new MockRaftActorContext.MockPayload("duh"));
+                new MockRaftActorContext.MockPayload("duh"), false);
 
         // Now send a CaptureSnapshotReply
-        mockActorRef.tell(new CaptureSnapshotReply(fromObject("foo").toByteArray()), mockActorRef);
+        mockActorRef.tell(new CaptureSnapshotReply(ByteState.of(fromObject("foo").toByteArray()),
+                java.util.Optional.empty()), mockActorRef);
 
         // Trimming log in this scenario is a no-op
         assertEquals(3, leaderActor.getReplicatedLog().getSnapshotIndex());
@@ -912,6 +890,10 @@ public class RaftActorTest extends AbstractActorTest {
         assertEquals(3, leader.getReplicatedToAllIndex());
     }
 
+    private static DataPersistenceProvider createProvider() {
+        return new NonPersistentDataProvider(Runnable::run);
+    }
+
     @Test
     public void testSwitchBehavior() {
         String persistenceId = factory.generateActorId("leader-");
@@ -921,7 +903,7 @@ public class RaftActorTest extends AbstractActorTest {
         config.setIsolatedLeaderCheckInterval(new FiniteDuration(1, TimeUnit.DAYS));
         config.setSnapshotBatchCount(5);
 
-        DataPersistenceProvider dataPersistenceProvider = new NonPersistentDataProvider();
+        DataPersistenceProvider dataPersistenceProvider = createProvider();
 
         Map<String, String> peerAddresses = ImmutableMap.<String, String>builder().build();
 
@@ -953,7 +935,7 @@ public class RaftActorTest extends AbstractActorTest {
         assertEquals(RaftState.Leader, leaderActor.getCurrentBehavior().state());
     }
 
-    public static ByteString fromObject(Object snapshot) throws Exception {
+    public static ByteString fromObject(final Object snapshot) throws Exception {
         ByteArrayOutputStream bos = null;
         ObjectOutputStream os = null;
         try {
@@ -974,7 +956,7 @@ public class RaftActorTest extends AbstractActorTest {
     }
 
     @Test
-    public void testUpdateConfigParam() throws Exception {
+    public void testUpdateConfigParam() {
         DefaultConfigParamsImpl emptyConfig = new DefaultConfigParamsImpl();
         String persistenceId = factory.generateActorId("follower-");
         ImmutableMap<String, String> peerAddresses =
@@ -1022,10 +1004,10 @@ public class RaftActorTest extends AbstractActorTest {
     }
 
     @Test
-    public void testGetSnapshot() throws Exception {
+    public void testGetSnapshot() {
         TEST_LOG.info("testGetSnapshot starting");
 
-        final JavaTestKit kit = new JavaTestKit(getSystem());
+        final TestKit kit = new TestKit(getSystem());
 
         String persistenceId = factory.generateActorId("test-actor-");
         DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
@@ -1034,12 +1016,12 @@ public class RaftActorTest extends AbstractActorTest {
         long term = 3;
         long seqN = 1;
         InMemoryJournal.addEntry(persistenceId, seqN++, new UpdateElectionTerm(term, "member-1"));
-        InMemoryJournal.addEntry(persistenceId, seqN++, new MockRaftActorContext.MockReplicatedLogEntry(term, 0,
+        InMemoryJournal.addEntry(persistenceId, seqN++, new SimpleReplicatedLogEntry(0, term,
                 new MockRaftActorContext.MockPayload("A")));
-        InMemoryJournal.addEntry(persistenceId, seqN++, new MockRaftActorContext.MockReplicatedLogEntry(term, 1,
+        InMemoryJournal.addEntry(persistenceId, seqN++, new SimpleReplicatedLogEntry(1, term,
                 new MockRaftActorContext.MockPayload("B")));
         InMemoryJournal.addEntry(persistenceId, seqN++, new ApplyJournalEntries(1));
-        InMemoryJournal.addEntry(persistenceId, seqN++, new MockRaftActorContext.MockReplicatedLogEntry(term, 2,
+        InMemoryJournal.addEntry(persistenceId, seqN++, new SimpleReplicatedLogEntry(2, term,
                 new MockRaftActorContext.MockPayload("C")));
 
         TestActorRef<MockRaftActor> raftActorRef = factory.createTestActor(MockRaftActor.props(persistenceId,
@@ -1054,36 +1036,39 @@ public class RaftActorTest extends AbstractActorTest {
         raftActorRef.tell(GetSnapshot.INSTANCE, kit.getRef());
 
         ArgumentCaptor<ActorRef> replyActor = ArgumentCaptor.forClass(ActorRef.class);
-        verify(mockRaftActor.snapshotCohortDelegate, timeout(5000)).createSnapshot(replyActor.capture());
+        verify(mockRaftActor.snapshotCohortDelegate, timeout(5000)).createSnapshot(replyActor.capture(),
+                eq(java.util.Optional.empty()));
 
         byte[] stateSnapshot = new byte[]{1,2,3};
-        replyActor.getValue().tell(new CaptureSnapshotReply(stateSnapshot), ActorRef.noSender());
+        replyActor.getValue().tell(new CaptureSnapshotReply(ByteState.of(stateSnapshot), java.util.Optional.empty()),
+                ActorRef.noSender());
 
         GetSnapshotReply reply = kit.expectMsgClass(GetSnapshotReply.class);
 
         assertEquals("getId", persistenceId, reply.getId());
-        Snapshot replySnapshot = SerializationUtils.deserialize(reply.getSnapshot());
+        Snapshot replySnapshot = reply.getSnapshot();
         assertEquals("getElectionTerm", term, replySnapshot.getElectionTerm());
         assertEquals("getElectionVotedFor", "member-1", replySnapshot.getElectionVotedFor());
         assertEquals("getLastAppliedIndex", 1L, replySnapshot.getLastAppliedIndex());
         assertEquals("getLastAppliedTerm", term, replySnapshot.getLastAppliedTerm());
         assertEquals("getLastIndex", 2L, replySnapshot.getLastIndex());
         assertEquals("getLastTerm", term, replySnapshot.getLastTerm());
-        assertArrayEquals("getState", stateSnapshot, replySnapshot.getState());
+        assertEquals("getState", ByteState.of(stateSnapshot), replySnapshot.getState());
         assertEquals("getUnAppliedEntries size", 1, replySnapshot.getUnAppliedEntries().size());
         assertEquals("UnApplied entry index ", 2L, replySnapshot.getUnAppliedEntries().get(0).getIndex());
 
         // Test with timeout
 
         mockRaftActor.getSnapshotMessageSupport().setSnapshotReplyActorTimeout(
-                Duration.create(200, TimeUnit.MILLISECONDS));
+            FiniteDuration.create(200, TimeUnit.MILLISECONDS));
         reset(mockRaftActor.snapshotCohortDelegate);
 
         raftActorRef.tell(GetSnapshot.INSTANCE, kit.getRef());
         Failure failure = kit.expectMsgClass(akka.actor.Status.Failure.class);
         assertEquals("Failure cause type", TimeoutException.class, failure.cause().getClass());
 
-        mockRaftActor.getSnapshotMessageSupport().setSnapshotReplyActorTimeout(Duration.create(30, TimeUnit.SECONDS));
+        mockRaftActor.getSnapshotMessageSupport().setSnapshotReplyActorTimeout(
+            FiniteDuration.create(30, TimeUnit.SECONDS));
 
         // Test with persistence disabled.
 
@@ -1092,24 +1077,24 @@ public class RaftActorTest extends AbstractActorTest {
 
         raftActorRef.tell(GetSnapshot.INSTANCE, kit.getRef());
         reply = kit.expectMsgClass(GetSnapshotReply.class);
-        verify(mockRaftActor.snapshotCohortDelegate, never()).createSnapshot(any(ActorRef.class));
+        verify(mockRaftActor.snapshotCohortDelegate, never()).createSnapshot(any(), any());
 
         assertEquals("getId", persistenceId, reply.getId());
-        replySnapshot = SerializationUtils.deserialize(reply.getSnapshot());
+        replySnapshot = reply.getSnapshot();
         assertEquals("getElectionTerm", term, replySnapshot.getElectionTerm());
         assertEquals("getElectionVotedFor", "member-1", replySnapshot.getElectionVotedFor());
         assertEquals("getLastAppliedIndex", -1L, replySnapshot.getLastAppliedIndex());
         assertEquals("getLastAppliedTerm", -1L, replySnapshot.getLastAppliedTerm());
         assertEquals("getLastIndex", -1L, replySnapshot.getLastIndex());
         assertEquals("getLastTerm", -1L, replySnapshot.getLastTerm());
-        assertEquals("getState length", 0, replySnapshot.getState().length);
+        assertEquals("getState type", EmptyState.INSTANCE, replySnapshot.getState());
         assertEquals("getUnAppliedEntries size", 0, replySnapshot.getUnAppliedEntries().size());
 
         TEST_LOG.info("testGetSnapshot ending");
     }
 
     @Test
-    public void testRestoreFromSnapshot() throws Exception {
+    public void testRestoreFromSnapshot() {
         TEST_LOG.info("testRestoreFromSnapshot starting");
 
         String persistenceId = factory.generateActorId("test-actor-");
@@ -1122,20 +1107,19 @@ public class RaftActorTest extends AbstractActorTest {
         int snapshotLastApplied = 3;
         int snapshotLastIndex = 4;
 
-        List<MockPayload> state = Arrays.asList(
+        MockSnapshotState snapshotState = new MockSnapshotState(Arrays.asList(
                 new MockRaftActorContext.MockPayload("A"),
                 new MockRaftActorContext.MockPayload("B"),
                 new MockRaftActorContext.MockPayload("C"),
-                new MockRaftActorContext.MockPayload("D"));
-        ByteString stateBytes = fromObject(state);
+                new MockRaftActorContext.MockPayload("D")));
 
-        Snapshot snapshot = Snapshot.create(stateBytes.toByteArray(), snapshotUnappliedEntries,
-                snapshotLastIndex, 1, snapshotLastApplied, 1, 1, "member-1");
+        Snapshot snapshot = Snapshot.create(snapshotState, snapshotUnappliedEntries,
+                snapshotLastIndex, 1, snapshotLastApplied, 1, 1, "member-1", null);
 
         InMemorySnapshotStore.addSnapshotSavedLatch(persistenceId);
 
         TestActorRef<MockRaftActor> raftActorRef = factory.createTestActor(MockRaftActor.builder().id(persistenceId)
-                .config(config).restoreFromSnapshot(SerializationUtils.serialize(snapshot)).props()
+                .config(config).restoreFromSnapshot(snapshot).props()
                     .withDispatcher(Dispatchers.DefaultDispatcherId()), persistenceId);
         MockRaftActor mockRaftActor = raftActorRef.underlyingActor();
 
@@ -1148,29 +1132,29 @@ public class RaftActorTest extends AbstractActorTest {
         assertEquals("getLastAppliedTerm", snapshot.getLastAppliedTerm(), savedSnapshot.getLastAppliedTerm());
         assertEquals("getLastIndex", snapshot.getLastIndex(), savedSnapshot.getLastIndex());
         assertEquals("getLastTerm", snapshot.getLastTerm(), savedSnapshot.getLastTerm());
-        assertArrayEquals("getState", snapshot.getState(), savedSnapshot.getState());
+        assertEquals("getState", snapshot.getState(), savedSnapshot.getState());
         assertEquals("getUnAppliedEntries", snapshot.getUnAppliedEntries(), savedSnapshot.getUnAppliedEntries());
 
-        verify(mockRaftActor.snapshotCohortDelegate, timeout(5000)).applySnapshot(any(byte[].class));
+        verify(mockRaftActor.snapshotCohortDelegate, timeout(5000)).applySnapshot(any(Snapshot.State.class));
 
         RaftActorContext context = mockRaftActor.getRaftActorContext();
         assertEquals("Journal log size", 1, context.getReplicatedLog().size());
         assertEquals("Last index", snapshotLastIndex, context.getReplicatedLog().lastIndex());
         assertEquals("Last applied", snapshotLastApplied, context.getLastApplied());
         assertEquals("Commit index", snapshotLastApplied, context.getCommitIndex());
-        assertEquals("Recovered state", state, mockRaftActor.getState());
+        assertEquals("Recovered state", snapshotState.getState(), mockRaftActor.getState());
         assertEquals("Current term", 1L, context.getTermInformation().getCurrentTerm());
         assertEquals("Voted for", "member-1", context.getTermInformation().getVotedFor());
 
         // Test with data persistence disabled
 
-        snapshot = Snapshot.create(new byte[0], Collections.<ReplicatedLogEntry>emptyList(),
-                -1, -1, -1, -1, 5, "member-1");
+        snapshot = Snapshot.create(EmptyState.INSTANCE, Collections.<ReplicatedLogEntry>emptyList(),
+                -1, -1, -1, -1, 5, "member-1", null);
 
         persistenceId = factory.generateActorId("test-actor-");
 
         raftActorRef = factory.createTestActor(MockRaftActor.builder().id(persistenceId)
-                .config(config).restoreFromSnapshot(SerializationUtils.serialize(snapshot))
+                .config(config).restoreFromSnapshot(snapshot)
                 .persistent(Optional.of(Boolean.FALSE)).props()
                     .withDispatcher(Dispatchers.DefaultDispatcherId()), persistenceId);
         mockRaftActor = raftActorRef.underlyingActor();
@@ -1195,21 +1179,21 @@ public class RaftActorTest extends AbstractActorTest {
         config.setCustomRaftPolicyImplementationClass(DisableElectionsRaftPolicy.class.getName());
 
         List<MockPayload> state = Arrays.asList(new MockRaftActorContext.MockPayload("A"));
-        Snapshot snapshot = Snapshot.create(fromObject(state).toByteArray(), Arrays.<ReplicatedLogEntry>asList(),
-                5, 2, 5, 2, 2, "member-1");
+        Snapshot snapshot = Snapshot.create(ByteState.of(fromObject(state).toByteArray()),
+                Arrays.<ReplicatedLogEntry>asList(), 5, 2, 5, 2, 2, "member-1", null);
 
-        InMemoryJournal.addEntry(persistenceId, 1, new MockRaftActorContext.MockReplicatedLogEntry(1, 0,
+        InMemoryJournal.addEntry(persistenceId, 1, new SimpleReplicatedLogEntry(0, 1,
                 new MockRaftActorContext.MockPayload("B")));
 
         TestActorRef<MockRaftActor> raftActorRef = factory.createTestActor(MockRaftActor.builder().id(persistenceId)
-                .config(config).restoreFromSnapshot(SerializationUtils.serialize(snapshot)).props()
+                .config(config).restoreFromSnapshot(snapshot).props()
                     .withDispatcher(Dispatchers.DefaultDispatcherId()), persistenceId);
         MockRaftActor mockRaftActor = raftActorRef.underlyingActor();
 
         mockRaftActor.waitForRecoveryComplete();
 
         Uninterruptibles.sleepUninterruptibly(500, TimeUnit.MILLISECONDS);
-        verify(mockRaftActor.snapshotCohortDelegate, never()).applySnapshot(any(byte[].class));
+        verify(mockRaftActor.snapshotCohortDelegate, never()).applySnapshot(any(Snapshot.State.class));
 
         RaftActorContext context = mockRaftActor.getRaftActorContext();
         assertEquals("Journal log size", 1, context.getReplicatedLog().size());
@@ -1223,7 +1207,7 @@ public class RaftActorTest extends AbstractActorTest {
     }
 
     @Test
-    public void testNonVotingOnRecovery() throws Exception {
+    public void testNonVotingOnRecovery() {
         TEST_LOG.info("testNonVotingOnRecovery starting");
 
         DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
@@ -1231,7 +1215,7 @@ public class RaftActorTest extends AbstractActorTest {
         config.setHeartBeatInterval(FiniteDuration.create(1, TimeUnit.MILLISECONDS));
 
         String persistenceId = factory.generateActorId("test-actor-");
-        InMemoryJournal.addEntry(persistenceId, 1,  new MockRaftActorContext.MockReplicatedLogEntry(1, 0,
+        InMemoryJournal.addEntry(persistenceId, 1,  new SimpleReplicatedLogEntry(0, 1,
                 new ServerConfigurationPayload(Arrays.asList(new ServerInfo(persistenceId, false)))));
 
         TestActorRef<MockRaftActor> raftActorRef = factory.createTestActor(MockRaftActor.builder().id(persistenceId)
@@ -1249,11 +1233,10 @@ public class RaftActorTest extends AbstractActorTest {
     }
 
     @Test
-    public void testLeaderTransitioning() throws Exception {
+    public void testLeaderTransitioning() {
         TEST_LOG.info("testLeaderTransitioning starting");
 
-        TestActorRef<MessageCollectorActor> notifierActor = factory.createTestActor(
-                Props.create(MessageCollectorActor.class));
+        ActorRef notifierActor = factory.createActor(MessageCollectorActor.props());
 
         DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
         config.setCustomRaftPolicyImplementationClass(DisableElectionsRaftPolicy.class.getName());
@@ -1275,7 +1258,7 @@ public class RaftActorTest extends AbstractActorTest {
 
         MessageCollectorActor.clearMessages(notifierActor);
 
-        raftActorRef.tell(LeaderTransitioning.INSTANCE, ActorRef.noSender());
+        raftActorRef.tell(new LeaderTransitioning("leader"), ActorRef.noSender());
 
         leaderStateChange = MessageCollectorActor.expectFirstMatching(notifierActor, LeaderStateChanged.class);
         assertEquals("getMemberId", persistenceId, leaderStateChange.getMemberId());
@@ -1290,7 +1273,7 @@ public class RaftActorTest extends AbstractActorTest {
         final String leaderId = factory.generateActorId("leader-");
         final String followerId = factory.generateActorId("follower-");
 
-        final ActorRef followerActor = factory.createActor(Props.create(MessageCollectorActor.class));
+        final ActorRef followerActor = factory.createActor(MessageCollectorActor.props());
 
         DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
         config.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
@@ -1310,7 +1293,8 @@ public class RaftActorTest extends AbstractActorTest {
         Leader leader = new Leader(leaderActor.getRaftActorContext());
         leaderActor.setCurrentBehavior(leader);
 
-        leaderActor.persistData(leaderActorRef, new MockIdentifier("1"), new MockRaftActorContext.MockPayload("1"));
+        leaderActor.persistData(leaderActorRef, new MockIdentifier("1"), new MockRaftActorContext.MockPayload("1"),
+                false);
 
         ReplicatedLogEntry logEntry = leaderActor.getReplicatedLog().get(0);
         assertNotNull("ReplicatedLogEntry not found", logEntry);
@@ -1328,4 +1312,42 @@ public class RaftActorTest extends AbstractActorTest {
         assertEquals("getCommitIndex", 0, leaderActor.getRaftActorContext().getCommitIndex());
         assertEquals("getLastApplied", 0, leaderActor.getRaftActorContext().getLastApplied());
     }
+
+    @Test
+    public void testReplicateWithBatchHint() throws Exception {
+        final String leaderId = factory.generateActorId("leader-");
+        final String followerId = factory.generateActorId("follower-");
+
+        final ActorRef followerActor = factory.createActor(MessageCollectorActor.props());
+
+        DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
+        config.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
+        config.setIsolatedLeaderCheckInterval(new FiniteDuration(1, TimeUnit.DAYS));
+
+        TestActorRef<MockRaftActor> leaderActorRef = factory.createTestActor(
+                MockRaftActor.props(leaderId, ImmutableMap.of(followerId, followerActor.path().toString()), config),
+                    leaderId);
+        MockRaftActor leaderActor = leaderActorRef.underlyingActor();
+        leaderActor.waitForInitializeBehaviorComplete();
+
+        leaderActor.getRaftActorContext().getTermInformation().update(1, leaderId);
+
+        Leader leader = new Leader(leaderActor.getRaftActorContext());
+        leaderActor.setCurrentBehavior(leader);
+
+        MessageCollectorActor.expectFirstMatching(followerActor, AppendEntries.class);
+        MessageCollectorActor.clearMessages(followerActor);
+
+        leaderActor.onReceiveCommand(new AppendEntriesReply(followerId, 1, true, -1, -1, (short)0));
+
+        leaderActor.persistData(leaderActorRef, new MockIdentifier("1"), new MockPayload("1"), true);
+        MessageCollectorActor.assertNoneMatching(followerActor, AppendEntries.class, 500);
+
+        leaderActor.persistData(leaderActorRef, new MockIdentifier("2"), new MockPayload("2"), true);
+        MessageCollectorActor.assertNoneMatching(followerActor, AppendEntries.class, 500);
+
+        leaderActor.persistData(leaderActorRef, new MockIdentifier("3"), new MockPayload("3"), false);
+        AppendEntries appendEntries = MessageCollectorActor.expectFirstMatching(followerActor, AppendEntries.class);
+        assertEquals("AppendEntries size", 3, appendEntries.getEntries().size());
+    }
 }