opendaylight/md-sal/sal-akka-raft/src/test/java/org/opendaylight/controller/cluster/raft/RaftActorTest.java

   1 package org.opendaylight.controller.cluster.raft;
   2
   3 import static org.junit.Assert.assertEquals;
   4 import static org.junit.Assert.assertFalse;
   5 import static org.junit.Assert.assertNotEquals;
   6 import static org.junit.Assert.assertNotNull;
   7 import static org.junit.Assert.assertNull;
   8 import static org.junit.Assert.assertTrue;
   9 import static org.mockito.Matchers.any;
  10 import static org.mockito.Matchers.anyObject;
  11 import static org.mockito.Matchers.eq;
  12 import static org.mockito.Mockito.doReturn;
  13 import static org.mockito.Mockito.mock;
  14 import static org.mockito.Mockito.times;
  15 import static org.mockito.Mockito.verify;
  16 import akka.actor.ActorRef;
  17 import akka.actor.ActorSystem;
  18 import akka.actor.PoisonPill;
  19 import akka.actor.Props;
  20 import akka.actor.Terminated;
  21 import akka.japi.Creator;
  22 import akka.japi.Procedure;
  23 import akka.pattern.Patterns;
  24 import akka.persistence.RecoveryCompleted;
  25 import akka.persistence.SaveSnapshotFailure;
  26 import akka.persistence.SaveSnapshotSuccess;
  27 import akka.persistence.SnapshotMetadata;
  28 import akka.persistence.SnapshotOffer;
  29 import akka.persistence.SnapshotSelectionCriteria;
  30 import akka.testkit.JavaTestKit;
  31 import akka.testkit.TestActorRef;
  32 import akka.util.Timeout;
  33 import com.google.common.base.Optional;
  34 import com.google.common.collect.Lists;
  35 import com.google.common.util.concurrent.Uninterruptibles;
  36 import com.google.protobuf.ByteString;
  37 import java.io.ByteArrayInputStream;
  38 import java.io.ByteArrayOutputStream;
  39 import java.io.IOException;
  40 import java.io.ObjectInputStream;
  41 import java.io.ObjectOutputStream;
  42 import java.util.ArrayList;
  43 import java.util.Arrays;
  44 import java.util.Collections;
  45 import java.util.HashMap;
  46 import java.util.List;
  47 import java.util.Map;
  48 import java.util.concurrent.CountDownLatch;
  49 import java.util.concurrent.TimeUnit;
  50 import java.util.concurrent.TimeoutException;
  51 import org.junit.After;
  52 import org.junit.Assert;
  53 import org.junit.Before;
  54 import org.junit.Test;
  55 import org.opendaylight.controller.cluster.DataPersistenceProvider;
  56 import org.opendaylight.controller.cluster.datastore.DataPersistenceProviderMonitor;
  57 import org.opendaylight.controller.cluster.notifications.RoleChanged;
  58 import org.opendaylight.controller.cluster.raft.base.messages.ApplyLogEntries;
  59 import org.opendaylight.controller.cluster.raft.base.messages.ApplySnapshot;
  60 import org.opendaylight.controller.cluster.raft.base.messages.ApplyState;
  61 import org.opendaylight.controller.cluster.raft.base.messages.CaptureSnapshot;
  62 import org.opendaylight.controller.cluster.raft.base.messages.CaptureSnapshotReply;
  63 import org.opendaylight.controller.cluster.raft.base.messages.InitiateInstallSnapshot;
  64 import org.opendaylight.controller.cluster.raft.behaviors.Follower;
  65 import org.opendaylight.controller.cluster.raft.behaviors.Leader;
  66 import org.opendaylight.controller.cluster.raft.client.messages.FindLeader;
  67 import org.opendaylight.controller.cluster.raft.client.messages.FindLeaderReply;
  68 import org.opendaylight.controller.cluster.raft.messages.AppendEntries;
  69 import org.opendaylight.controller.cluster.raft.messages.AppendEntriesReply;
  70 import org.opendaylight.controller.cluster.raft.protobuff.client.messages.Payload;
  71 import org.opendaylight.controller.cluster.raft.utils.MessageCollectorActor;
  72 import org.opendaylight.controller.cluster.raft.utils.MockAkkaJournal;
  73 import org.opendaylight.controller.cluster.raft.utils.MockSnapshotStore;
  74 import scala.concurrent.Await;
  75 import scala.concurrent.Future;
  76 import scala.concurrent.duration.Duration;
  77 import scala.concurrent.duration.FiniteDuration;
  78
  79 public class RaftActorTest extends AbstractActorTest {
  80
  81     private TestActorFactory factory;
  82
  83     @Before
  84     public void setUp(){
  85         factory = new TestActorFactory(getSystem());
  86     }
  87
  88     @After
  89     public void tearDown() throws Exception {
  90         factory.close();
  91         MockAkkaJournal.clearJournal();
  92         MockSnapshotStore.setMockSnapshot(null);
  93     }
  94
  95     public static class MockRaftActor extends RaftActor {
  96
  97         private final DataPersistenceProvider dataPersistenceProvider;
  98         private final RaftActor delegate;
  99         private final CountDownLatch recoveryComplete = new CountDownLatch(1);
 100         private final List<Object> state;
 101         private ActorRef roleChangeNotifier;
 102         private final CountDownLatch initializeBehaviorComplete = new CountDownLatch(1);
 103
 104         public static final class MockRaftActorCreator implements Creator<MockRaftActor> {
 105             private static final long serialVersionUID = 1L;
 106             private final Map<String, String> peerAddresses;
 107             private final String id;
 108             private final Optional<ConfigParams> config;
 109             private final DataPersistenceProvider dataPersistenceProvider;
 110             private final ActorRef roleChangeNotifier;
 111
 112             private MockRaftActorCreator(Map<String, String> peerAddresses, String id,
 113                 Optional<ConfigParams> config, DataPersistenceProvider dataPersistenceProvider,
 114                 ActorRef roleChangeNotifier) {
 115                 this.peerAddresses = peerAddresses;
 116                 this.id = id;
 117                 this.config = config;
 118                 this.dataPersistenceProvider = dataPersistenceProvider;
 119                 this.roleChangeNotifier = roleChangeNotifier;
 120             }
 121
 122             @Override
 123             public MockRaftActor create() throws Exception {
 124                 MockRaftActor mockRaftActor = new MockRaftActor(id, peerAddresses, config,
 125                     dataPersistenceProvider);
 126                 mockRaftActor.roleChangeNotifier = this.roleChangeNotifier;
 127                 return mockRaftActor;
 128             }
 129         }
 130
 131         public MockRaftActor(String id, Map<String, String> peerAddresses, Optional<ConfigParams> config,
 132                              DataPersistenceProvider dataPersistenceProvider) {
 133             super(id, peerAddresses, config);
 134             state = new ArrayList<>();
 135             this.delegate = mock(RaftActor.class);
 136             if(dataPersistenceProvider == null){
 137                 this.dataPersistenceProvider = new PersistentDataProvider();
 138             } else {
 139                 this.dataPersistenceProvider = dataPersistenceProvider;
 140             }
 141         }
 142
 143         public void waitForRecoveryComplete() {
 144             try {
 145                 assertEquals("Recovery complete", true, recoveryComplete.await(5,  TimeUnit.SECONDS));
 146             } catch (InterruptedException e) {
 147                 e.printStackTrace();
 148             }
 149         }
 150
 151         public void waitForInitializeBehaviorComplete() {
 152             try {
 153                 assertEquals("Behavior initialized", true, initializeBehaviorComplete.await(5,  TimeUnit.SECONDS));
 154             } catch (InterruptedException e) {
 155                 e.printStackTrace();
 156             }
 157         }
 158
 159         public List<Object> getState() {
 160             return state;
 161         }
 162
 163         public static Props props(final String id, final Map<String, String> peerAddresses,
 164                 Optional<ConfigParams> config){
 165             return Props.create(new MockRaftActorCreator(peerAddresses, id, config, null, null));
 166         }
 167
 168         public static Props props(final String id, final Map<String, String> peerAddresses,
 169                                   Optional<ConfigParams> config, DataPersistenceProvider dataPersistenceProvider){
 170             return Props.create(new MockRaftActorCreator(peerAddresses, id, config, dataPersistenceProvider, null));
 171         }
 172
 173         public static Props props(final String id, final Map<String, String> peerAddresses,
 174             Optional<ConfigParams> config, ActorRef roleChangeNotifier){
 175             return Props.create(new MockRaftActorCreator(peerAddresses, id, config, null, roleChangeNotifier));
 176         }
 177
 178         @Override protected void applyState(ActorRef clientActor, String identifier, Object data) {
 179             delegate.applyState(clientActor, identifier, data);
 180             LOG.info("applyState called");
 181         }
 182
 183         @Override
 184         protected void startLogRecoveryBatch(int maxBatchSize) {
 185         }
 186
 187         @Override
 188         protected void appendRecoveredLogEntry(Payload data) {
 189             state.add(data);
 190         }
 191
 192         @Override
 193         protected void applyCurrentLogRecoveryBatch() {
 194         }
 195
 196         @Override
 197         protected void onRecoveryComplete() {
 198             delegate.onRecoveryComplete();
 199             recoveryComplete.countDown();
 200         }
 201
 202         @Override
 203         protected void initializeBehavior() {
 204             super.initializeBehavior();
 205             initializeBehaviorComplete.countDown();
 206         }
 207
 208         @Override
 209         protected void applyRecoverySnapshot(byte[] bytes) {
 210             delegate.applyRecoverySnapshot(bytes);
 211             try {
 212                 Object data = toObject(bytes);
 213                 if (data instanceof List) {
 214                     state.addAll((List<?>) data);
 215                 }
 216             } catch (Exception e) {
 217                 e.printStackTrace();
 218             }
 219         }
 220
 221         @Override protected void createSnapshot() {
 222             delegate.createSnapshot();
 223         }
 224
 225         @Override protected void applySnapshot(byte [] snapshot) {
 226             delegate.applySnapshot(snapshot);
 227         }
 228
 229         @Override protected void onStateChanged() {
 230             delegate.onStateChanged();
 231         }
 232
 233         @Override
 234         protected DataPersistenceProvider persistence() {
 235             return this.dataPersistenceProvider;
 236         }
 237
 238         @Override
 239         protected Optional<ActorRef> getRoleChangeNotifier() {
 240             return Optional.fromNullable(roleChangeNotifier);
 241         }
 242
 243         @Override public String persistenceId() {
 244             return this.getId();
 245         }
 246
 247         private Object toObject(byte[] bs) throws ClassNotFoundException, IOException {
 248             Object obj = null;
 249             ByteArrayInputStream bis = null;
 250             ObjectInputStream ois = null;
 251             try {
 252                 bis = new ByteArrayInputStream(bs);
 253                 ois = new ObjectInputStream(bis);
 254                 obj = ois.readObject();
 255             } finally {
 256                 if (bis != null) {
 257                     bis.close();
 258                 }
 259                 if (ois != null) {
 260                     ois.close();
 261                 }
 262             }
 263             return obj;
 264         }
 265
 266         public ReplicatedLog getReplicatedLog(){
 267             return this.getRaftActorContext().getReplicatedLog();
 268         }
 269
 270     }
 271
 272
 273     private static class RaftActorTestKit extends JavaTestKit {
 274         private final ActorRef raftActor;
 275
 276         public RaftActorTestKit(ActorSystem actorSystem, String actorName) {
 277             super(actorSystem);
 278
 279             raftActor = this.getSystem().actorOf(MockRaftActor.props(actorName,
 280                     Collections.<String,String>emptyMap(), Optional.<ConfigParams>absent()), actorName);
 281
 282         }
 283
 284
 285         public ActorRef getRaftActor() {
 286             return raftActor;
 287         }
 288
 289         public boolean waitForLogMessage(final Class<?> logEventClass, String message){
 290             // Wait for a specific log message to show up
 291             return
 292                 new JavaTestKit.EventFilter<Boolean>(logEventClass
 293                 ) {
 294                     @Override
 295                     protected Boolean run() {
 296                         return true;
 297                     }
 298                 }.from(raftActor.path().toString())
 299                     .message(message)
 300                     .occurrences(1).exec();
 301
 302
 303         }
 304
 305         protected void waitUntilLeader(){
 306             waitUntilLeader(raftActor);
 307         }
 308
 309         protected void waitUntilLeader(ActorRef actorRef) {
 310             FiniteDuration duration = Duration.create(100, TimeUnit.MILLISECONDS);
 311             for(int i = 0; i < 20 * 5; i++) {
 312                 Future<Object> future = Patterns.ask(actorRef, new FindLeader(), new Timeout(duration));
 313                 try {
 314                     FindLeaderReply resp = (FindLeaderReply) Await.result(future, duration);
 315                     if(resp.getLeaderActor() != null) {
 316                         return;
 317                     }
 318                 } catch(TimeoutException e) {
 319                 } catch(Exception e) {
 320                     System.err.println("FindLeader threw ex");
 321                     e.printStackTrace();
 322                 }
 323
 324
 325                 Uninterruptibles.sleepUninterruptibly(50, TimeUnit.MILLISECONDS);
 326             }
 327
 328             Assert.fail("Leader not found for actorRef " + actorRef.path());
 329         }
 330
 331     }
 332
 333
 334     @Test
 335     public void testConstruction() {
 336         new RaftActorTestKit(getSystem(), "testConstruction").waitUntilLeader();
 337     }
 338
 339     @Test
 340     public void testFindLeaderWhenLeaderIsSelf(){
 341         RaftActorTestKit kit = new RaftActorTestKit(getSystem(), "testFindLeader");
 342         kit.waitUntilLeader();
 343     }
 344
 345     @Test
 346     public void testRaftActorRecovery() throws Exception {
 347         new JavaTestKit(getSystem()) {{
 348             String persistenceId = factory.generateActorId("follower-");
 349
 350             DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
 351             // Set the heartbeat interval high to essentially disable election otherwise the test
 352             // may fail if the actor is switched to Leader and the commitIndex is set to the last
 353             // log entry.
 354             config.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 355
 356             ActorRef followerActor = factory.createActor(MockRaftActor.props(persistenceId,
 357                     Collections.<String, String>emptyMap(), Optional.<ConfigParams>of(config)), persistenceId);
 358
 359             watch(followerActor);
 360
 361             List<ReplicatedLogEntry> snapshotUnappliedEntries = new ArrayList<>();
 362             ReplicatedLogEntry entry1 = new MockRaftActorContext.MockReplicatedLogEntry(1, 4,
 363                     new MockRaftActorContext.MockPayload("E"));
 364             snapshotUnappliedEntries.add(entry1);
 365
 366             int lastAppliedDuringSnapshotCapture = 3;
 367             int lastIndexDuringSnapshotCapture = 4;
 368
 369             // 4 messages as part of snapshot, which are applied to state
 370             ByteString snapshotBytes = fromObject(Arrays.asList(
 371                     new MockRaftActorContext.MockPayload("A"),
 372                     new MockRaftActorContext.MockPayload("B"),
 373                     new MockRaftActorContext.MockPayload("C"),
 374                     new MockRaftActorContext.MockPayload("D")));
 375
 376             Snapshot snapshot = Snapshot.create(snapshotBytes.toByteArray(),
 377                     snapshotUnappliedEntries, lastIndexDuringSnapshotCapture, 1,
 378                     lastAppliedDuringSnapshotCapture, 1);
 379             MockSnapshotStore.setMockSnapshot(snapshot);
 380             MockSnapshotStore.setPersistenceId(persistenceId);
 381
 382             // add more entries after snapshot is taken
 383             List<ReplicatedLogEntry> entries = new ArrayList<>();
 384             ReplicatedLogEntry entry2 = new MockRaftActorContext.MockReplicatedLogEntry(1, 5,
 385                     new MockRaftActorContext.MockPayload("F"));
 386             ReplicatedLogEntry entry3 = new MockRaftActorContext.MockReplicatedLogEntry(1, 6,
 387                     new MockRaftActorContext.MockPayload("G"));
 388             ReplicatedLogEntry entry4 = new MockRaftActorContext.MockReplicatedLogEntry(1, 7,
 389                     new MockRaftActorContext.MockPayload("H"));
 390             entries.add(entry2);
 391             entries.add(entry3);
 392             entries.add(entry4);
 393
 394             int lastAppliedToState = 5;
 395             int lastIndex = 7;
 396
 397             MockAkkaJournal.addToJournal(5, entry2);
 398             // 2 entries are applied to state besides the 4 entries in snapshot
 399             MockAkkaJournal.addToJournal(6, new ApplyLogEntries(lastAppliedToState));
 400             MockAkkaJournal.addToJournal(7, entry3);
 401             MockAkkaJournal.addToJournal(8, entry4);
 402
 403             // kill the actor
 404             followerActor.tell(PoisonPill.getInstance(), null);
 405             expectMsgClass(duration("5 seconds"), Terminated.class);
 406
 407             unwatch(followerActor);
 408
 409             //reinstate the actor
 410             TestActorRef<MockRaftActor> ref = factory.createTestActor(
 411                     MockRaftActor.props(persistenceId, Collections.<String, String>emptyMap(),
 412                             Optional.<ConfigParams>of(config)));
 413
 414             ref.underlyingActor().waitForRecoveryComplete();
 415
 416             RaftActorContext context = ref.underlyingActor().getRaftActorContext();
 417             assertEquals("Journal log size", snapshotUnappliedEntries.size() + entries.size(),
 418                     context.getReplicatedLog().size());
 419             assertEquals("Last index", lastIndex, context.getReplicatedLog().lastIndex());
 420             assertEquals("Last applied", lastAppliedToState, context.getLastApplied());
 421             assertEquals("Commit index", lastAppliedToState, context.getCommitIndex());
 422             assertEquals("Recovered state size", 6, ref.underlyingActor().getState().size());
 423         }};
 424     }
 425
 426     /**
 427      * This test verifies that when recovery is applicable (typically when persistence is true) the RaftActor does
 428      * process recovery messages
 429      *
 430      * @throws Exception
 431      */
 432
 433     @Test
 434     public void testHandleRecoveryWhenDataPersistenceRecoveryApplicable() throws Exception {
 435         new JavaTestKit(getSystem()) {
 436             {
 437                 String persistenceId = factory.generateActorId("leader-");
 438
 439                 DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
 440
 441                 config.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 442
 443                 TestActorRef<MockRaftActor> mockActorRef = factory.createTestActor(MockRaftActor.props(persistenceId,
 444                         Collections.<String, String>emptyMap(), Optional.<ConfigParams>of(config)), persistenceId);
 445
 446                 MockRaftActor mockRaftActor = mockActorRef.underlyingActor();
 447
 448                 // Wait for akka's recovery to complete so it doesn't interfere.
 449                 mockRaftActor.waitForRecoveryComplete();
 450
 451                 ByteString snapshotBytes = fromObject(Arrays.asList(
 452                         new MockRaftActorContext.MockPayload("A"),
 453                         new MockRaftActorContext.MockPayload("B"),
 454                         new MockRaftActorContext.MockPayload("C"),
 455                         new MockRaftActorContext.MockPayload("D")));
 456
 457                 Snapshot snapshot = Snapshot.create(snapshotBytes.toByteArray(),
 458                         Lists.<ReplicatedLogEntry>newArrayList(), 3, 1, 3, 1);
 459
 460                 mockRaftActor.onReceiveRecover(new SnapshotOffer(new SnapshotMetadata(persistenceId, 100, 100), snapshot));
 461
 462                 verify(mockRaftActor.delegate).applyRecoverySnapshot(eq(snapshotBytes.toByteArray()));
 463
 464                 mockRaftActor.onReceiveRecover(new ReplicatedLogImplEntry(0, 1, new MockRaftActorContext.MockPayload("A")));
 465
 466                 ReplicatedLog replicatedLog = mockRaftActor.getReplicatedLog();
 467
 468                 assertEquals("add replicated log entry", 1, replicatedLog.size());
 469
 470                 mockRaftActor.onReceiveRecover(new ReplicatedLogImplEntry(1, 1, new MockRaftActorContext.MockPayload("A")));
 471
 472                 assertEquals("add replicated log entry", 2, replicatedLog.size());
 473
 474                 mockRaftActor.onReceiveRecover(new ApplyLogEntries(1));
 475
 476                 assertEquals("commit index 1", 1, mockRaftActor.getRaftActorContext().getCommitIndex());
 477
 478                 // The snapshot had 4 items + we added 2 more items during the test
 479                 // We start removing from 5 and we should get 1 item in the replicated log
 480                 mockRaftActor.onReceiveRecover(new RaftActor.DeleteEntries(5));
 481
 482                 assertEquals("remove log entries", 1, replicatedLog.size());
 483
 484                 mockRaftActor.onReceiveRecover(new RaftActor.UpdateElectionTerm(10, "foobar"));
 485
 486                 assertEquals("election term", 10, mockRaftActor.getRaftActorContext().getTermInformation().getCurrentTerm());
 487                 assertEquals("voted for", "foobar", mockRaftActor.getRaftActorContext().getTermInformation().getVotedFor());
 488
 489                 mockRaftActor.onReceiveRecover(mock(RecoveryCompleted.class));
 490
 491             }};
 492     }
 493
 494     /**
 495      * This test verifies that when recovery is not applicable (typically when persistence is false) the RaftActor does
 496      * not process recovery messages
 497      *
 498      * @throws Exception
 499      */
 500     @Test
 501     public void testHandleRecoveryWhenDataPersistenceRecoveryNotApplicable() throws Exception {
 502         new JavaTestKit(getSystem()) {
 503             {
 504                 String persistenceId = factory.generateActorId("leader-");
 505
 506                 DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
 507
 508                 config.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 509
 510                 TestActorRef<MockRaftActor> mockActorRef = factory.createTestActor(MockRaftActor.props(persistenceId,
 511                         Collections.<String, String>emptyMap(), Optional.<ConfigParams>of(config), new DataPersistenceProviderMonitor()), persistenceId);
 512
 513                 MockRaftActor mockRaftActor = mockActorRef.underlyingActor();
 514
 515                 // Wait for akka's recovery to complete so it doesn't interfere.
 516                 mockRaftActor.waitForRecoveryComplete();
 517
 518                 ByteString snapshotBytes = fromObject(Arrays.asList(
 519                         new MockRaftActorContext.MockPayload("A"),
 520                         new MockRaftActorContext.MockPayload("B"),
 521                         new MockRaftActorContext.MockPayload("C"),
 522                         new MockRaftActorContext.MockPayload("D")));
 523
 524                 Snapshot snapshot = Snapshot.create(snapshotBytes.toByteArray(),
 525                         Lists.<ReplicatedLogEntry>newArrayList(), 3, 1, 3, 1);
 526
 527                 mockRaftActor.onReceiveRecover(new SnapshotOffer(new SnapshotMetadata(persistenceId, 100, 100), snapshot));
 528
 529                 verify(mockRaftActor.delegate, times(0)).applyRecoverySnapshot(any(byte[].class));
 530
 531                 mockRaftActor.onReceiveRecover(new ReplicatedLogImplEntry(0, 1, new MockRaftActorContext.MockPayload("A")));
 532
 533                 ReplicatedLog replicatedLog = mockRaftActor.getReplicatedLog();
 534
 535                 assertEquals("add replicated log entry", 0, replicatedLog.size());
 536
 537                 mockRaftActor.onReceiveRecover(new ReplicatedLogImplEntry(1, 1, new MockRaftActorContext.MockPayload("A")));
 538
 539                 assertEquals("add replicated log entry", 0, replicatedLog.size());
 540
 541                 mockRaftActor.onReceiveRecover(new ApplyLogEntries(1));
 542
 543                 assertEquals("commit index -1", -1, mockRaftActor.getRaftActorContext().getCommitIndex());
 544
 545                 mockRaftActor.onReceiveRecover(new RaftActor.DeleteEntries(2));
 546
 547                 assertEquals("remove log entries", 0, replicatedLog.size());
 548
 549                 mockRaftActor.onReceiveRecover(new RaftActor.UpdateElectionTerm(10, "foobar"));
 550
 551                 assertNotEquals("election term", 10, mockRaftActor.getRaftActorContext().getTermInformation().getCurrentTerm());
 552                 assertNotEquals("voted for", "foobar", mockRaftActor.getRaftActorContext().getTermInformation().getVotedFor());
 553
 554                 mockRaftActor.onReceiveRecover(mock(RecoveryCompleted.class));
 555
 556             }};
 557     }
 558
 559
 560     @Test
 561     public void testUpdatingElectionTermCallsDataPersistence() throws Exception {
 562         new JavaTestKit(getSystem()) {
 563             {
 564                 String persistenceId = factory.generateActorId("leader-");
 565
 566                 DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
 567
 568                 config.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 569
 570                 CountDownLatch persistLatch = new CountDownLatch(1);
 571                 DataPersistenceProviderMonitor dataPersistenceProviderMonitor = new DataPersistenceProviderMonitor();
 572                 dataPersistenceProviderMonitor.setPersistLatch(persistLatch);
 573
 574                 TestActorRef<MockRaftActor> mockActorRef = factory.createTestActor(MockRaftActor.props(persistenceId,
 575                         Collections.<String, String>emptyMap(), Optional.<ConfigParams>of(config), dataPersistenceProviderMonitor), persistenceId);
 576
 577                 MockRaftActor mockRaftActor = mockActorRef.underlyingActor();
 578
 579                 mockRaftActor.getRaftActorContext().getTermInformation().updateAndPersist(10, "foobar");
 580
 581                 assertEquals("Persist called", true, persistLatch.await(5, TimeUnit.SECONDS));
 582
 583             }
 584
 585         };
 586     }
 587
 588     @Test
 589     public void testAddingReplicatedLogEntryCallsDataPersistence() throws Exception {
 590         new JavaTestKit(getSystem()) {
 591             {
 592                 String persistenceId = factory.generateActorId("leader-");
 593
 594                 DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
 595
 596                 config.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 597
 598                 DataPersistenceProvider dataPersistenceProvider = mock(DataPersistenceProvider.class);
 599
 600                 TestActorRef<MockRaftActor> mockActorRef = factory.createTestActor(MockRaftActor.props(persistenceId,
 601                         Collections.<String, String>emptyMap(), Optional.<ConfigParams>of(config), dataPersistenceProvider), persistenceId);
 602
 603                 MockRaftActor mockRaftActor = mockActorRef.underlyingActor();
 604
 605                 MockRaftActorContext.MockReplicatedLogEntry logEntry = new MockRaftActorContext.MockReplicatedLogEntry(10, 10, mock(Payload.class));
 606
 607                 mockRaftActor.getRaftActorContext().getReplicatedLog().appendAndPersist(logEntry);
 608
 609                 verify(dataPersistenceProvider).persist(eq(logEntry), any(Procedure.class));
 610
 611             }
 612
 613         };
 614     }
 615
 616     @Test
 617     public void testRemovingReplicatedLogEntryCallsDataPersistence() throws Exception {
 618         new JavaTestKit(getSystem()) {
 619             {
 620                 String persistenceId = factory.generateActorId("leader-");
 621
 622                 DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
 623
 624                 config.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 625
 626                 DataPersistenceProvider dataPersistenceProvider = mock(DataPersistenceProvider.class);
 627
 628                 TestActorRef<MockRaftActor> mockActorRef = factory.createTestActor(MockRaftActor.props(persistenceId,
 629                         Collections.<String, String>emptyMap(), Optional.<ConfigParams>of(config), dataPersistenceProvider), persistenceId);
 630
 631                 MockRaftActor mockRaftActor = mockActorRef.underlyingActor();
 632
 633                 mockRaftActor.getReplicatedLog().appendAndPersist(new MockRaftActorContext.MockReplicatedLogEntry(1, 0, mock(Payload.class)));
 634
 635                 mockRaftActor.getRaftActorContext().getReplicatedLog().removeFromAndPersist(0);
 636
 637                 verify(dataPersistenceProvider, times(2)).persist(anyObject(), any(Procedure.class));
 638
 639             }
 640
 641         };
 642     }
 643
 644     @Test
 645     public void testApplyLogEntriesCallsDataPersistence() throws Exception {
 646         new JavaTestKit(getSystem()) {
 647             {
 648                 String persistenceId = factory.generateActorId("leader-");
 649
 650                 DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
 651
 652                 config.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 653
 654                 DataPersistenceProvider dataPersistenceProvider = mock(DataPersistenceProvider.class);
 655
 656                 TestActorRef<MockRaftActor> mockActorRef = factory.createTestActor(MockRaftActor.props(persistenceId,
 657                         Collections.<String, String>emptyMap(), Optional.<ConfigParams>of(config), dataPersistenceProvider), persistenceId);
 658
 659                 MockRaftActor mockRaftActor = mockActorRef.underlyingActor();
 660
 661                 mockRaftActor.onReceiveCommand(new ApplyLogEntries(10));
 662
 663                 verify(dataPersistenceProvider, times(1)).persist(anyObject(), any(Procedure.class));
 664
 665             }
 666
 667         };
 668     }
 669
 670     @Test
 671     public void testCaptureSnapshotReplyCallsDataPersistence() throws Exception {
 672         new JavaTestKit(getSystem()) {
 673             {
 674                 String persistenceId = factory.generateActorId("leader-");
 675
 676                 DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
 677
 678                 config.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 679
 680                 DataPersistenceProvider dataPersistenceProvider = mock(DataPersistenceProvider.class);
 681
 682                 TestActorRef<MockRaftActor> mockActorRef = factory.createTestActor(
 683                         MockRaftActor.props(persistenceId, Collections.<String, String>emptyMap(),
 684                                 Optional.<ConfigParams>of(config), dataPersistenceProvider), persistenceId);
 685
 686                 MockRaftActor mockRaftActor = mockActorRef.underlyingActor();
 687
 688                 ByteString snapshotBytes = fromObject(Arrays.asList(
 689                         new MockRaftActorContext.MockPayload("A"),
 690                         new MockRaftActorContext.MockPayload("B"),
 691                         new MockRaftActorContext.MockPayload("C"),
 692                         new MockRaftActorContext.MockPayload("D")));
 693
 694                 mockRaftActor.onReceiveCommand(new CaptureSnapshot(-1, 1, -1, 1));
 695
 696                 RaftActorContext raftActorContext = mockRaftActor.getRaftActorContext();
 697
 698                 mockRaftActor.setCurrentBehavior(new Leader(raftActorContext));
 699
 700                 mockRaftActor.onReceiveCommand(new CaptureSnapshotReply(snapshotBytes.toByteArray()));
 701
 702                 verify(dataPersistenceProvider).saveSnapshot(anyObject());
 703
 704             }
 705         };
 706     }
 707
 708     @Test
 709     public void testSaveSnapshotSuccessCallsDataPersistence() throws Exception {
 710         new JavaTestKit(getSystem()) {
 711             {
 712                 String persistenceId = factory.generateActorId("leader-");
 713
 714                 DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
 715
 716                 config.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 717
 718                 DataPersistenceProvider dataPersistenceProvider = mock(DataPersistenceProvider.class);
 719
 720                 TestActorRef<MockRaftActor> mockActorRef = factory.createTestActor(MockRaftActor.props(persistenceId,
 721                         Collections.<String, String>emptyMap(), Optional.<ConfigParams>of(config), dataPersistenceProvider), persistenceId);
 722
 723                 MockRaftActor mockRaftActor = mockActorRef.underlyingActor();
 724
 725                 mockRaftActor.getReplicatedLog().append(new MockRaftActorContext.MockReplicatedLogEntry(1, 0, mock(Payload.class)));
 726                 mockRaftActor.getReplicatedLog().append(new MockRaftActorContext.MockReplicatedLogEntry(1, 1, mock(Payload.class)));
 727                 mockRaftActor.getReplicatedLog().append(new MockRaftActorContext.MockReplicatedLogEntry(1, 2, mock(Payload.class)));
 728                 mockRaftActor.getReplicatedLog().append(new MockRaftActorContext.MockReplicatedLogEntry(1, 3, mock(Payload.class)));
 729                 mockRaftActor.getReplicatedLog().append(new MockRaftActorContext.MockReplicatedLogEntry(1, 4, mock(Payload.class)));
 730
 731                 ByteString snapshotBytes = fromObject(Arrays.asList(
 732                         new MockRaftActorContext.MockPayload("A"),
 733                         new MockRaftActorContext.MockPayload("B"),
 734                         new MockRaftActorContext.MockPayload("C"),
 735                         new MockRaftActorContext.MockPayload("D")));
 736
 737                 RaftActorContext raftActorContext = mockRaftActor.getRaftActorContext();
 738                 mockRaftActor.setCurrentBehavior(new Follower(raftActorContext));
 739
 740                 mockRaftActor.onReceiveCommand(new CaptureSnapshot(-1, 1, 2, 1));
 741
 742                 verify(mockRaftActor.delegate).createSnapshot();
 743
 744                 mockRaftActor.onReceiveCommand(new CaptureSnapshotReply(snapshotBytes.toByteArray()));
 745
 746                 mockRaftActor.onReceiveCommand(new SaveSnapshotSuccess(new SnapshotMetadata("foo", 100, 100)));
 747
 748                 verify(dataPersistenceProvider).deleteSnapshots(any(SnapshotSelectionCriteria.class));
 749
 750                 verify(dataPersistenceProvider).deleteMessages(100);
 751
 752                 assertEquals(2, mockRaftActor.getReplicatedLog().size());
 753
 754                 assertNotNull(mockRaftActor.getReplicatedLog().get(3));
 755                 assertNotNull(mockRaftActor.getReplicatedLog().get(4));
 756
 757                 // Index 2 will not be in the log because it was removed due to snapshotting
 758                 assertNull(mockRaftActor.getReplicatedLog().get(2));
 759
 760             }
 761         };
 762     }
 763
 764     @Test
 765     public void testApplyState() throws Exception {
 766
 767         new JavaTestKit(getSystem()) {
 768             {
 769                 String persistenceId = factory.generateActorId("leader-");
 770
 771                 DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
 772
 773                 config.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 774
 775                 DataPersistenceProvider dataPersistenceProvider = mock(DataPersistenceProvider.class);
 776
 777                 TestActorRef<MockRaftActor> mockActorRef = factory.createTestActor(MockRaftActor.props(persistenceId,
 778                         Collections.<String, String>emptyMap(), Optional.<ConfigParams>of(config), dataPersistenceProvider), persistenceId);
 779
 780                 MockRaftActor mockRaftActor = mockActorRef.underlyingActor();
 781
 782                 ReplicatedLogEntry entry = new MockRaftActorContext.MockReplicatedLogEntry(1, 5,
 783                         new MockRaftActorContext.MockPayload("F"));
 784
 785                 mockRaftActor.onReceiveCommand(new ApplyState(mockActorRef, "apply-state", entry));
 786
 787                 verify(mockRaftActor.delegate).applyState(eq(mockActorRef), eq("apply-state"), anyObject());
 788
 789             }
 790         };
 791     }
 792
 793     @Test
 794     public void testApplySnapshot() throws Exception {
 795         new JavaTestKit(getSystem()) {
 796             {
 797                 String persistenceId = factory.generateActorId("leader-");
 798
 799                 DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
 800
 801                 config.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 802
 803                 DataPersistenceProviderMonitor dataPersistenceProviderMonitor = new DataPersistenceProviderMonitor();
 804
 805                 TestActorRef<MockRaftActor> mockActorRef = factory.createTestActor(MockRaftActor.props(persistenceId,
 806                         Collections.<String, String>emptyMap(), Optional.<ConfigParams>of(config), dataPersistenceProviderMonitor), persistenceId);
 807
 808                 MockRaftActor mockRaftActor = mockActorRef.underlyingActor();
 809
 810                 ReplicatedLog oldReplicatedLog = mockRaftActor.getReplicatedLog();
 811
 812                 oldReplicatedLog.append(new MockRaftActorContext.MockReplicatedLogEntry(1, 0, mock(Payload.class)));
 813                 oldReplicatedLog.append(new MockRaftActorContext.MockReplicatedLogEntry(1, 1, mock(Payload.class)));
 814                 oldReplicatedLog.append(
 815                         new MockRaftActorContext.MockReplicatedLogEntry(1, 2,
 816                                 mock(Payload.class)));
 817
 818                 ByteString snapshotBytes = fromObject(Arrays.asList(
 819                         new MockRaftActorContext.MockPayload("A"),
 820                         new MockRaftActorContext.MockPayload("B"),
 821                         new MockRaftActorContext.MockPayload("C"),
 822                         new MockRaftActorContext.MockPayload("D")));
 823
 824                 Snapshot snapshot = mock(Snapshot.class);
 825
 826                 doReturn(snapshotBytes.toByteArray()).when(snapshot).getState();
 827
 828                 doReturn(3L).when(snapshot).getLastAppliedIndex();
 829
 830                 mockRaftActor.onReceiveCommand(new ApplySnapshot(snapshot));
 831
 832                 verify(mockRaftActor.delegate).applySnapshot(eq(snapshot.getState()));
 833
 834                 assertTrue("The replicatedLog should have changed",
 835                         oldReplicatedLog != mockRaftActor.getReplicatedLog());
 836
 837                 assertEquals("lastApplied should be same as in the snapshot",
 838                         (Long) 3L, mockRaftActor.getLastApplied());
 839
 840                 assertEquals(0, mockRaftActor.getReplicatedLog().size());
 841
 842             }
 843         };
 844     }
 845
 846     @Test
 847     public void testSaveSnapshotFailure() throws Exception {
 848         new JavaTestKit(getSystem()) {
 849             {
 850                 String persistenceId = factory.generateActorId("leader-");
 851
 852                 DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
 853
 854                 config.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 855
 856                 DataPersistenceProviderMonitor dataPersistenceProviderMonitor = new DataPersistenceProviderMonitor();
 857
 858                 TestActorRef<MockRaftActor> mockActorRef = factory.createTestActor(MockRaftActor.props(persistenceId,
 859                         Collections.<String, String>emptyMap(), Optional.<ConfigParams>of(config), dataPersistenceProviderMonitor), persistenceId);
 860
 861                 MockRaftActor mockRaftActor = mockActorRef.underlyingActor();
 862
 863                 ByteString snapshotBytes = fromObject(Arrays.asList(
 864                         new MockRaftActorContext.MockPayload("A"),
 865                         new MockRaftActorContext.MockPayload("B"),
 866                         new MockRaftActorContext.MockPayload("C"),
 867                         new MockRaftActorContext.MockPayload("D")));
 868
 869                 RaftActorContext raftActorContext = mockRaftActor.getRaftActorContext();
 870
 871                 mockRaftActor.setCurrentBehavior(new Leader(raftActorContext));
 872
 873                 mockRaftActor.onReceiveCommand(new CaptureSnapshot(-1, 1, -1, 1));
 874
 875                 mockRaftActor.onReceiveCommand(new CaptureSnapshotReply(snapshotBytes.toByteArray()));
 876
 877                 mockRaftActor.onReceiveCommand(new SaveSnapshotFailure(new SnapshotMetadata("foobar", 10L, 1234L),
 878                         new Exception()));
 879
 880                 assertEquals("Snapshot index should not have advanced because save snapshot failed", -1,
 881                         mockRaftActor.getReplicatedLog().getSnapshotIndex());
 882
 883             }
 884         };
 885     }
 886
 887     @Test
 888     public void testRaftRoleChangeNotifier() throws Exception {
 889         new JavaTestKit(getSystem()) {{
 890             ActorRef notifierActor = factory.createActor(Props.create(MessageCollectorActor.class));
 891             DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
 892             String persistenceId = factory.generateActorId("notifier-");
 893
 894             factory.createTestActor(MockRaftActor.props(persistenceId,
 895                     Collections.<String, String>emptyMap(), Optional.<ConfigParams>of(config), notifierActor), persistenceId);
 896
 897             // sleeping for a minimum of 2 seconds, if it spans more its fine.
 898             Uninterruptibles.sleepUninterruptibly(2, TimeUnit.SECONDS);
 899
 900             List<Object> matches = MessageCollectorActor.getAllMatching(notifierActor, RoleChanged.class);
 901             assertNotNull(matches);
 902             assertEquals(3, matches.size());
 903
 904             // check if the notifier got a role change from null to Follower
 905             RoleChanged raftRoleChanged = (RoleChanged) matches.get(0);
 906             assertEquals(persistenceId, raftRoleChanged.getMemberId());
 907             assertNull(raftRoleChanged.getOldRole());
 908             assertEquals(RaftState.Follower.name(), raftRoleChanged.getNewRole());
 909
 910             // check if the notifier got a role change from Follower to Candidate
 911             raftRoleChanged = (RoleChanged) matches.get(1);
 912             assertEquals(persistenceId, raftRoleChanged.getMemberId());
 913             assertEquals(RaftState.Follower.name(), raftRoleChanged.getOldRole());
 914             assertEquals(RaftState.Candidate.name(), raftRoleChanged.getNewRole());
 915
 916             // check if the notifier got a role change from Candidate to Leader
 917             raftRoleChanged = (RoleChanged) matches.get(2);
 918             assertEquals(persistenceId, raftRoleChanged.getMemberId());
 919             assertEquals(RaftState.Candidate.name(), raftRoleChanged.getOldRole());
 920             assertEquals(RaftState.Leader.name(), raftRoleChanged.getNewRole());
 921         }};
 922     }
 923
 924     @Test
 925     public void testFakeSnapshotsForLeaderWithInRealSnapshots() throws Exception {
 926         new JavaTestKit(getSystem()) {
 927             {
 928                 String persistenceId = factory.generateActorId("leader-");
 929                 String follower1Id = factory.generateActorId("follower-");
 930
 931                 ActorRef followerActor1 =
 932                         factory.createActor(Props.create(MessageCollectorActor.class));
 933
 934                 DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
 935                 config.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 936                 config.setIsolatedLeaderCheckInterval(new FiniteDuration(1, TimeUnit.DAYS));
 937
 938                 DataPersistenceProvider dataPersistenceProvider = mock(DataPersistenceProvider.class);
 939
 940                 Map<String, String> peerAddresses = new HashMap<>();
 941                 peerAddresses.put(follower1Id, followerActor1.path().toString());
 942
 943                 TestActorRef<MockRaftActor> mockActorRef = TestActorRef.create(getSystem(),
 944                         MockRaftActor.props(persistenceId, peerAddresses,
 945                                 Optional.<ConfigParams>of(config), dataPersistenceProvider), persistenceId);
 946
 947                 MockRaftActor leaderActor = mockActorRef.underlyingActor();
 948                 leaderActor.getRaftActorContext().setCommitIndex(4);
 949                 leaderActor.getRaftActorContext().setLastApplied(4);
 950                 leaderActor.getRaftActorContext().getTermInformation().update(1, persistenceId);
 951
 952                 leaderActor.waitForInitializeBehaviorComplete();
 953
 954                 // create 8 entries in the log - 0 to 4 are applied and will get picked up as part of the capture snapshot
 955
 956                 Leader leader = new Leader(leaderActor.getRaftActorContext());
 957                 leaderActor.setCurrentBehavior(leader);
 958                 assertEquals(RaftState.Leader, leaderActor.getCurrentBehavior().state());
 959
 960                 MockRaftActorContext.MockReplicatedLogBuilder logBuilder = new MockRaftActorContext.MockReplicatedLogBuilder();
 961                 leaderActor.getRaftActorContext().setReplicatedLog(logBuilder.createEntries(0, 8, 1).build());
 962
 963                 assertEquals(8, leaderActor.getReplicatedLog().size());
 964
 965                 leaderActor.onReceiveCommand(new CaptureSnapshot(6, 1, 4, 1));
 966                 leaderActor.getRaftActorContext().setSnapshotCaptureInitiated(true);
 967                 verify(leaderActor.delegate).createSnapshot();
 968
 969                 assertEquals(8, leaderActor.getReplicatedLog().size());
 970
 971                 assertEquals(RaftState.Leader, leaderActor.getCurrentBehavior().state());
 972                 //fake snapshot on index 5
 973                 leaderActor.onReceiveCommand(new AppendEntriesReply(follower1Id, 1, true, 5, 1));
 974
 975                 assertEquals(8, leaderActor.getReplicatedLog().size());
 976
 977                 //fake snapshot on index 6
 978                 assertEquals(RaftState.Leader, leaderActor.getCurrentBehavior().state());
 979                 leaderActor.onReceiveCommand(new AppendEntriesReply(follower1Id, 1, true, 6, 1));
 980                 assertEquals(8, leaderActor.getReplicatedLog().size());
 981
 982                 assertEquals(RaftState.Leader, leaderActor.getCurrentBehavior().state());
 983
 984                 assertEquals(8, leaderActor.getReplicatedLog().size());
 985
 986                 ByteString snapshotBytes = fromObject(Arrays.asList(
 987                         new MockRaftActorContext.MockPayload("foo-0"),
 988                         new MockRaftActorContext.MockPayload("foo-1"),
 989                         new MockRaftActorContext.MockPayload("foo-2"),
 990                         new MockRaftActorContext.MockPayload("foo-3"),
 991                         new MockRaftActorContext.MockPayload("foo-4")));
 992                 leaderActor.onReceiveCommand(new CaptureSnapshotReply(snapshotBytes.toByteArray()));
 993                 assertFalse(leaderActor.getRaftActorContext().isSnapshotCaptureInitiated());
 994
 995                 // capture snapshot reply should remove the snapshotted entries only
 996                 assertEquals(3, leaderActor.getReplicatedLog().size());
 997                 assertEquals(7, leaderActor.getReplicatedLog().lastIndex());
 998
 999                 // add another non-replicated entry
1000                 leaderActor.getReplicatedLog().append(
1001                         new ReplicatedLogImplEntry(8, 1, new MockRaftActorContext.MockPayload("foo-8")));
1002
1003                 //fake snapshot on index 7, since lastApplied = 7 , we would keep the last applied
1004                 leaderActor.onReceiveCommand(new AppendEntriesReply(follower1Id, 1, true, 7, 1));
1005                 assertEquals(2, leaderActor.getReplicatedLog().size());
1006                 assertEquals(8, leaderActor.getReplicatedLog().lastIndex());
1007
1008             }
1009         };
1010     }
1011
1012     @Test
1013     public void testFakeSnapshotsForFollowerWithInRealSnapshots() throws Exception {
1014         new JavaTestKit(getSystem()) {
1015             {
1016                 String persistenceId = factory.generateActorId("follower-");
1017                 String leaderId = factory.generateActorId("leader-");
1018
1019
1020                 ActorRef leaderActor1 =
1021                         factory.createActor(Props.create(MessageCollectorActor.class));
1022
1023                 DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
1024                 config.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
1025                 config.setIsolatedLeaderCheckInterval(new FiniteDuration(1, TimeUnit.DAYS));
1026
1027                 DataPersistenceProvider dataPersistenceProvider = mock(DataPersistenceProvider.class);
1028
1029                 Map<String, String> peerAddresses = new HashMap<>();
1030                 peerAddresses.put(leaderId, leaderActor1.path().toString());
1031
1032                 TestActorRef<MockRaftActor> mockActorRef = TestActorRef.create(getSystem(),
1033                         MockRaftActor.props(persistenceId, peerAddresses,
1034                                 Optional.<ConfigParams>of(config), dataPersistenceProvider), persistenceId);
1035
1036                 MockRaftActor followerActor = mockActorRef.underlyingActor();
1037                 followerActor.getRaftActorContext().setCommitIndex(4);
1038                 followerActor.getRaftActorContext().setLastApplied(4);
1039                 followerActor.getRaftActorContext().getTermInformation().update(1, persistenceId);
1040
1041                 followerActor.waitForInitializeBehaviorComplete();
1042
1043                 // create 8 entries in the log - 0 to 4 are applied and will get picked up as part of the capture snapshot
1044                 Follower follower = new Follower(followerActor.getRaftActorContext());
1045                 followerActor.setCurrentBehavior(follower);
1046                 assertEquals(RaftState.Follower, followerActor.getCurrentBehavior().state());
1047
1048                 MockRaftActorContext.MockReplicatedLogBuilder logBuilder = new MockRaftActorContext.MockReplicatedLogBuilder();
1049                 followerActor.getRaftActorContext().setReplicatedLog(logBuilder.createEntries(0, 6, 1).build());
1050
1051                 // log as indices 0-5
1052                 assertEquals(6, followerActor.getReplicatedLog().size());
1053
1054                 //snapshot on 4
1055                 followerActor.onReceiveCommand(new CaptureSnapshot(5, 1, 4, 1));
1056                 followerActor.getRaftActorContext().setSnapshotCaptureInitiated(true);
1057                 verify(followerActor.delegate).createSnapshot();
1058
1059                 assertEquals(6, followerActor.getReplicatedLog().size());
1060
1061                 //fake snapshot on index 6
1062                 List<ReplicatedLogEntry> entries =
1063                         Arrays.asList(
1064                                 (ReplicatedLogEntry) new MockRaftActorContext.MockReplicatedLogEntry(1, 6,
1065                                         new MockRaftActorContext.MockPayload("foo-6"))
1066                         );
1067                 followerActor.onReceiveCommand(new AppendEntries(1, leaderId, 5, 1, entries, 5, 5));
1068                 assertEquals(7, followerActor.getReplicatedLog().size());
1069
1070                 //fake snapshot on index 7
1071                 assertEquals(RaftState.Follower, followerActor.getCurrentBehavior().state());
1072
1073                 entries =
1074                         Arrays.asList(
1075                                 (ReplicatedLogEntry) new MockRaftActorContext.MockReplicatedLogEntry(1, 7,
1076                                         new MockRaftActorContext.MockPayload("foo-7"))
1077                         );
1078                 followerActor.onReceiveCommand(new AppendEntries(1, leaderId, 6, 1, entries, 6, 6));
1079                 assertEquals(8, followerActor.getReplicatedLog().size());
1080
1081                 assertEquals(RaftState.Follower, followerActor.getCurrentBehavior().state());
1082
1083
1084                 ByteString snapshotBytes = fromObject(Arrays.asList(
1085                         new MockRaftActorContext.MockPayload("foo-0"),
1086                         new MockRaftActorContext.MockPayload("foo-1"),
1087                         new MockRaftActorContext.MockPayload("foo-2"),
1088                         new MockRaftActorContext.MockPayload("foo-3"),
1089                         new MockRaftActorContext.MockPayload("foo-4")));
1090                 followerActor.onReceiveCommand(new CaptureSnapshotReply(snapshotBytes.toByteArray()));
1091                 assertFalse(followerActor.getRaftActorContext().isSnapshotCaptureInitiated());
1092
1093                 // capture snapshot reply should remove the snapshotted entries only
1094                 assertEquals(3, followerActor.getReplicatedLog().size()); //indexes 5,6,7 left in the log
1095                 assertEquals(7, followerActor.getReplicatedLog().lastIndex());
1096
1097                 entries =
1098                         Arrays.asList(
1099                                 (ReplicatedLogEntry) new MockRaftActorContext.MockReplicatedLogEntry(1, 8,
1100                                         new MockRaftActorContext.MockPayload("foo-7"))
1101                         );
1102                 // send an additional entry 8 with leaderCommit = 7
1103                 followerActor.onReceiveCommand(new AppendEntries(1, leaderId, 7, 1, entries, 7, 7));
1104
1105                 // 7 and 8, as lastapplied is 7
1106                 assertEquals(2, followerActor.getReplicatedLog().size());
1107
1108             }
1109         };
1110     }
1111
1112     @Test
1113     public void testFakeSnapshotsForLeaderWithInInitiateSnapshots() throws Exception {
1114         new JavaTestKit(getSystem()) {
1115             {
1116                 String persistenceId = factory.generateActorId("leader-");
1117                 String follower1Id = factory.generateActorId("follower-");
1118                 String follower2Id = factory.generateActorId("follower-");
1119
1120                 ActorRef followerActor1 =
1121                         factory.createActor(Props.create(MessageCollectorActor.class), follower1Id);
1122                 ActorRef followerActor2 =
1123                         factory.createActor(Props.create(MessageCollectorActor.class), follower2Id);
1124
1125                 DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
1126                 config.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
1127                 config.setIsolatedLeaderCheckInterval(new FiniteDuration(1, TimeUnit.DAYS));
1128
1129                 DataPersistenceProvider dataPersistenceProvider = mock(DataPersistenceProvider.class);
1130
1131                 Map<String, String> peerAddresses = new HashMap<>();
1132                 peerAddresses.put(follower1Id, followerActor1.path().toString());
1133                 peerAddresses.put(follower2Id, followerActor2.path().toString());
1134
1135                 TestActorRef<MockRaftActor> mockActorRef = factory.createTestActor(
1136                         MockRaftActor.props(persistenceId, peerAddresses,
1137                                 Optional.<ConfigParams>of(config), dataPersistenceProvider), persistenceId);
1138
1139                 MockRaftActor leaderActor = mockActorRef.underlyingActor();
1140                 leaderActor.getRaftActorContext().setCommitIndex(9);
1141                 leaderActor.getRaftActorContext().setLastApplied(9);
1142                 leaderActor.getRaftActorContext().getTermInformation().update(1, persistenceId);
1143
1144                 leaderActor.waitForInitializeBehaviorComplete();
1145
1146                 Leader leader = new Leader(leaderActor.getRaftActorContext());
1147                 leaderActor.setCurrentBehavior(leader);
1148                 assertEquals(RaftState.Leader, leaderActor.getCurrentBehavior().state());
1149
1150                 // create 5 entries in the log
1151                 MockRaftActorContext.MockReplicatedLogBuilder logBuilder = new MockRaftActorContext.MockReplicatedLogBuilder();
1152                 leaderActor.getRaftActorContext().setReplicatedLog(logBuilder.createEntries(5, 10, 1).build());
1153                 //set the snapshot index to 4 , 0 to 4 are snapshotted
1154                 leaderActor.getRaftActorContext().getReplicatedLog().setSnapshotIndex(4);
1155                 assertEquals(5, leaderActor.getReplicatedLog().size());
1156
1157                 leaderActor.onReceiveCommand(new AppendEntriesReply(follower1Id, 1, true, 9, 1));
1158                 assertEquals(5, leaderActor.getReplicatedLog().size());
1159
1160                 // set the 2nd follower nextIndex to 1 which has been snapshotted
1161                 leaderActor.onReceiveCommand(new AppendEntriesReply(follower2Id, 1, true, 0, 1));
1162                 assertEquals(5, leaderActor.getReplicatedLog().size());
1163
1164                 // simulate a real snapshot
1165                 leaderActor.onReceiveCommand(new InitiateInstallSnapshot());
1166                 assertEquals(5, leaderActor.getReplicatedLog().size());
1167                 assertEquals(String.format("expected to be Leader but was %s. Current Leader = %s ",
1168                         leaderActor.getCurrentBehavior().state(), leaderActor.getLeaderId())
1169                         , RaftState.Leader, leaderActor.getCurrentBehavior().state());
1170
1171
1172                 //reply from a slow follower does not initiate a fake snapshot
1173                 leaderActor.onReceiveCommand(new AppendEntriesReply(follower2Id, 1, true, 9, 1));
1174                 assertEquals("Fake snapshot should not happen when Initiate is in progress", 5, leaderActor.getReplicatedLog().size());
1175
1176                 ByteString snapshotBytes = fromObject(Arrays.asList(
1177                         new MockRaftActorContext.MockPayload("foo-0"),
1178                         new MockRaftActorContext.MockPayload("foo-1"),
1179                         new MockRaftActorContext.MockPayload("foo-2"),
1180                         new MockRaftActorContext.MockPayload("foo-3"),
1181                         new MockRaftActorContext.MockPayload("foo-4")));
1182                 leaderActor.onReceiveCommand(new CaptureSnapshotReply(snapshotBytes.toByteArray()));
1183                 assertFalse(leaderActor.getRaftActorContext().isSnapshotCaptureInitiated());
1184
1185                 assertEquals("Real snapshot didn't clear the log till lastApplied", 0, leaderActor.getReplicatedLog().size());
1186
1187                 //reply from a slow follower after should not raise errors
1188                 leaderActor.onReceiveCommand(new AppendEntriesReply(follower2Id, 1, true, 5, 1));
1189                 assertEquals(0, leaderActor.getReplicatedLog().size());
1190             }
1191         };
1192     }
1193
1194     private ByteString fromObject(Object snapshot) throws Exception {
1195         ByteArrayOutputStream b = null;
1196         ObjectOutputStream o = null;
1197         try {
1198             b = new ByteArrayOutputStream();
1199             o = new ObjectOutputStream(b);
1200             o.writeObject(snapshot);
1201             byte[] snapshotBytes = b.toByteArray();
1202             return ByteString.copyFrom(snapshotBytes);
1203         } finally {
1204             if (o != null) {
1205                 o.flush();
1206                 o.close();
1207             }
1208             if (b != null) {
1209                 b.close();
1210             }
1211         }
1212     }
1213
1214 }