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

   1 /*
   2  * Copyright (c) 2015 Brocade Communications Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.controller.cluster.raft;
   9
  10 import static org.junit.Assert.assertEquals;
  11 import static org.junit.Assert.assertTrue;
  12 import static org.junit.Assert.fail;
  13 import static org.opendaylight.controller.cluster.raft.utils.MessageCollectorActor.assertNoneMatching;
  14 import static org.opendaylight.controller.cluster.raft.utils.MessageCollectorActor.clearMessages;
  15 import static org.opendaylight.controller.cluster.raft.utils.MessageCollectorActor.expectFirstMatching;
  16 import static org.opendaylight.controller.cluster.raft.utils.MessageCollectorActor.expectMatching;
  17
  18 import akka.actor.ActorRef;
  19 import akka.actor.Props;
  20 import akka.actor.UntypedActor;
  21 import akka.dispatch.Dispatchers;
  22 import akka.testkit.JavaTestKit;
  23 import akka.testkit.TestActorRef;
  24 import com.google.common.base.Optional;
  25 import com.google.common.base.Stopwatch;
  26 import com.google.common.collect.ImmutableMap;
  27 import com.google.common.collect.Maps;
  28 import com.google.common.collect.Sets;
  29 import com.google.common.io.ByteSource;
  30 import java.io.OutputStream;
  31 import java.util.ArrayList;
  32 import java.util.Arrays;
  33 import java.util.Collections;
  34 import java.util.List;
  35 import java.util.Map;
  36 import java.util.concurrent.TimeUnit;
  37 import org.apache.commons.lang3.SerializationUtils;
  38 import org.junit.After;
  39 import org.junit.Before;
  40 import org.junit.Test;
  41 import org.opendaylight.controller.cluster.NonPersistentDataProvider;
  42 import org.opendaylight.controller.cluster.raft.base.messages.ApplySnapshot;
  43 import org.opendaylight.controller.cluster.raft.base.messages.ApplyState;
  44 import org.opendaylight.controller.cluster.raft.base.messages.CaptureSnapshotReply;
  45 import org.opendaylight.controller.cluster.raft.base.messages.ElectionTimeout;
  46 import org.opendaylight.controller.cluster.raft.base.messages.InitiateCaptureSnapshot;
  47 import org.opendaylight.controller.cluster.raft.base.messages.TimeoutNow;
  48 import org.opendaylight.controller.cluster.raft.behaviors.AbstractLeader;
  49 import org.opendaylight.controller.cluster.raft.behaviors.Follower;
  50 import org.opendaylight.controller.cluster.raft.behaviors.Leader;
  51 import org.opendaylight.controller.cluster.raft.behaviors.RaftActorBehavior;
  52 import org.opendaylight.controller.cluster.raft.messages.AddServer;
  53 import org.opendaylight.controller.cluster.raft.messages.AddServerReply;
  54 import org.opendaylight.controller.cluster.raft.messages.AppendEntries;
  55 import org.opendaylight.controller.cluster.raft.messages.ChangeServersVotingStatus;
  56 import org.opendaylight.controller.cluster.raft.messages.InstallSnapshot;
  57 import org.opendaylight.controller.cluster.raft.messages.RemoveServer;
  58 import org.opendaylight.controller.cluster.raft.messages.RemoveServerReply;
  59 import org.opendaylight.controller.cluster.raft.messages.RequestVote;
  60 import org.opendaylight.controller.cluster.raft.messages.ServerChangeReply;
  61 import org.opendaylight.controller.cluster.raft.messages.ServerChangeStatus;
  62 import org.opendaylight.controller.cluster.raft.messages.ServerRemoved;
  63 import org.opendaylight.controller.cluster.raft.messages.UnInitializedFollowerSnapshotReply;
  64 import org.opendaylight.controller.cluster.raft.persisted.ApplyJournalEntries;
  65 import org.opendaylight.controller.cluster.raft.persisted.ByteState;
  66 import org.opendaylight.controller.cluster.raft.persisted.ServerConfigurationPayload;
  67 import org.opendaylight.controller.cluster.raft.persisted.ServerInfo;
  68 import org.opendaylight.controller.cluster.raft.persisted.SimpleReplicatedLogEntry;
  69 import org.opendaylight.controller.cluster.raft.persisted.UpdateElectionTerm;
  70 import org.opendaylight.controller.cluster.raft.policy.DisableElectionsRaftPolicy;
  71 import org.opendaylight.controller.cluster.raft.utils.ForwardMessageToBehaviorActor;
  72 import org.opendaylight.controller.cluster.raft.utils.InMemoryJournal;
  73 import org.opendaylight.controller.cluster.raft.utils.InMemorySnapshotStore;
  74 import org.opendaylight.controller.cluster.raft.utils.MessageCollectorActor;
  75 import org.slf4j.Logger;
  76 import org.slf4j.LoggerFactory;
  77 import scala.concurrent.duration.FiniteDuration;
  78
  79 /**
  80  * Unit tests for RaftActorServerConfigurationSupport.
  81  *
  82  * @author Thomas Pantelis
  83  */
  84 public class RaftActorServerConfigurationSupportTest extends AbstractActorTest {
  85     static final String LEADER_ID = "leader";
  86     static final String FOLLOWER_ID = "follower";
  87     static final String FOLLOWER_ID2 = "follower2";
  88     static final String NEW_SERVER_ID = "new-server";
  89     static final String NEW_SERVER_ID2 = "new-server2";
  90     private static final Logger LOG = LoggerFactory.getLogger(RaftActorServerConfigurationSupportTest.class);
  91     private static final Class<?> COMMIT_MESSAGE_CLASS = RaftActorSnapshotMessageSupport.COMMIT_SNAPSHOT.getClass();
  92     private static final boolean NO_PERSISTENCE = false;
  93     private static final boolean PERSISTENT = true;
  94
  95     private final TestActorFactory actorFactory = new TestActorFactory(getSystem());
  96
  97     private final TestActorRef<ForwardMessageToBehaviorActor> followerActor = actorFactory.createTestActor(
  98             Props.create(ForwardMessageToBehaviorActor.class).withDispatcher(Dispatchers.DefaultDispatcherId()),
  99             actorFactory.generateActorId(FOLLOWER_ID));
 100
 101     private TestActorRef<MockNewFollowerRaftActor> newFollowerRaftActor;
 102     private TestActorRef<MessageCollectorActor> newFollowerCollectorActor;
 103     private RaftActorContext newFollowerActorContext;
 104
 105     private final JavaTestKit testKit = new JavaTestKit(getSystem());
 106
 107     @Before
 108     public void setup() {
 109         InMemoryJournal.clear();
 110         InMemorySnapshotStore.clear();
 111     }
 112
 113     @SuppressWarnings("checkstyle:IllegalCatch")
 114     private void setupNewFollower() {
 115         DefaultConfigParamsImpl configParams = newFollowerConfigParams();
 116
 117         newFollowerCollectorActor = actorFactory.createTestActor(
 118                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
 119                 actorFactory.generateActorId(NEW_SERVER_ID + "Collector"));
 120         newFollowerRaftActor = actorFactory.createTestActor(MockNewFollowerRaftActor.props(
 121                 configParams, newFollowerCollectorActor).withDispatcher(Dispatchers.DefaultDispatcherId()),
 122                 actorFactory.generateActorId(NEW_SERVER_ID));
 123
 124         try {
 125             newFollowerActorContext = newFollowerRaftActor.underlyingActor().getRaftActorContext();
 126         } catch (Exception e) {
 127             newFollowerActorContext = newFollowerRaftActor.underlyingActor().getRaftActorContext();
 128         }
 129     }
 130
 131     private static DefaultConfigParamsImpl newFollowerConfigParams() {
 132         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
 133         configParams.setHeartBeatInterval(new FiniteDuration(100, TimeUnit.MILLISECONDS));
 134         configParams.setElectionTimeoutFactor(100000);
 135         configParams.setCustomRaftPolicyImplementationClass(DisableElectionsRaftPolicy.class.getName());
 136         return configParams;
 137     }
 138
 139     @After
 140     public void tearDown() throws Exception {
 141         actorFactory.close();
 142     }
 143
 144     @Test
 145     public void testAddServerWithExistingFollower() throws Exception {
 146         LOG.info("testAddServerWithExistingFollower starting");
 147         setupNewFollower();
 148         RaftActorContextImpl followerActorContext = newFollowerContext(FOLLOWER_ID, followerActor);
 149         followerActorContext.setReplicatedLog(new MockRaftActorContext.MockReplicatedLogBuilder().createEntries(
 150                 0, 3, 1).build());
 151         followerActorContext.setCommitIndex(2);
 152         followerActorContext.setLastApplied(2);
 153
 154         Follower follower = new Follower(followerActorContext);
 155         followerActor.underlyingActor().setBehavior(follower);
 156         followerActorContext.setCurrentBehavior(follower);
 157
 158         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 159                 MockLeaderRaftActor.props(ImmutableMap.of(FOLLOWER_ID, followerActor.path().toString()),
 160                         followerActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 161                 actorFactory.generateActorId(LEADER_ID));
 162
 163         // Expect initial heartbeat from the leader.
 164         expectFirstMatching(followerActor, AppendEntries.class);
 165         clearMessages(followerActor);
 166
 167         MockLeaderRaftActor leaderRaftActor = leaderActor.underlyingActor();
 168         final TestActorRef<MessageCollectorActor> leaderCollectorActor = newLeaderCollectorActor(leaderRaftActor);
 169
 170         leaderActor.tell(new AddServer(NEW_SERVER_ID, newFollowerRaftActor.path().toString(), true), testKit.getRef());
 171
 172         // Leader should install snapshot - capture and verify ApplySnapshot contents
 173
 174         ApplySnapshot applySnapshot = expectFirstMatching(newFollowerCollectorActor, ApplySnapshot.class);
 175         List<Object> snapshotState = MockRaftActor.fromState(applySnapshot.getSnapshot().getState());
 176         assertEquals("Snapshot state", snapshotState, leaderRaftActor.getState());
 177
 178         AddServerReply addServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 179         assertEquals("getStatus", ServerChangeStatus.OK, addServerReply.getStatus());
 180         assertEquals("getLeaderHint", LEADER_ID, addServerReply.getLeaderHint().get());
 181
 182         // Verify ServerConfigurationPayload entry in leader's log
 183
 184         expectFirstMatching(leaderCollectorActor, ApplyState.class);
 185         RaftActorContext leaderActorContext = leaderRaftActor.getRaftActorContext();
 186         assertEquals("Leader journal last index", 3, leaderActorContext.getReplicatedLog().lastIndex());
 187         assertEquals("Leader commit index", 3, leaderActorContext.getCommitIndex());
 188         assertEquals("Leader last applied index", 3, leaderActorContext.getLastApplied());
 189         verifyServerConfigurationPayloadEntry(leaderActorContext.getReplicatedLog(), votingServer(LEADER_ID),
 190                 votingServer(FOLLOWER_ID), votingServer(NEW_SERVER_ID));
 191
 192         // Verify ServerConfigurationPayload entry in both followers
 193
 194         expectFirstMatching(followerActor, ApplyState.class);
 195         assertEquals("Follower journal last index", 3, followerActorContext.getReplicatedLog().lastIndex());
 196         verifyServerConfigurationPayloadEntry(followerActorContext.getReplicatedLog(), votingServer(LEADER_ID),
 197                 votingServer(FOLLOWER_ID), votingServer(NEW_SERVER_ID));
 198
 199         expectFirstMatching(newFollowerCollectorActor, ApplyState.class);
 200         assertEquals("New follower journal last index", 3, newFollowerActorContext.getReplicatedLog().lastIndex());
 201         verifyServerConfigurationPayloadEntry(newFollowerActorContext.getReplicatedLog(), votingServer(LEADER_ID),
 202                 votingServer(FOLLOWER_ID), votingServer(NEW_SERVER_ID));
 203
 204         // Verify new server config was applied in both followers
 205
 206         assertEquals("Follower peers", Sets.newHashSet(LEADER_ID, NEW_SERVER_ID), followerActorContext.getPeerIds());
 207
 208         assertEquals("New follower peers", Sets.newHashSet(LEADER_ID, FOLLOWER_ID),
 209                 newFollowerActorContext.getPeerIds());
 210
 211         assertEquals("Follower commit index", 3, followerActorContext.getCommitIndex());
 212         assertEquals("Follower last applied index", 3, followerActorContext.getLastApplied());
 213         assertEquals("New follower commit index", 3, newFollowerActorContext.getCommitIndex());
 214         assertEquals("New follower last applied index", 3, newFollowerActorContext.getLastApplied());
 215
 216         assertEquals("Leader persisted ReplicatedLogImplEntry entries", 0,
 217                 InMemoryJournal.get(LEADER_ID, SimpleReplicatedLogEntry.class).size());
 218         assertEquals("Leader persisted ServerConfigurationPayload entries", 1,
 219                 InMemoryJournal.get(LEADER_ID, ServerConfigurationPayload.class).size());
 220
 221         assertEquals("New follower persisted ReplicatedLogImplEntry entries", 0,
 222                 InMemoryJournal.get(NEW_SERVER_ID, SimpleReplicatedLogEntry.class).size());
 223         assertEquals("New follower persisted ServerConfigurationPayload entries", 1,
 224                 InMemoryJournal.get(NEW_SERVER_ID, ServerConfigurationPayload.class).size());
 225
 226         LOG.info("testAddServerWithExistingFollower ending");
 227     }
 228
 229     @Test
 230     public void testAddServerWithNoExistingFollower() throws Exception {
 231         LOG.info("testAddServerWithNoExistingFollower starting");
 232
 233         setupNewFollower();
 234         RaftActorContext initialActorContext = new MockRaftActorContext();
 235         initialActorContext.setCommitIndex(1);
 236         initialActorContext.setLastApplied(1);
 237         initialActorContext.setReplicatedLog(new MockRaftActorContext.MockReplicatedLogBuilder().createEntries(
 238                 0, 2, 1).build());
 239
 240         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 241                 MockLeaderRaftActor.props(ImmutableMap.<String, String>of(),
 242                         initialActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 243                 actorFactory.generateActorId(LEADER_ID));
 244
 245         MockLeaderRaftActor leaderRaftActor = leaderActor.underlyingActor();
 246         final RaftActorContext leaderActorContext = leaderRaftActor.getRaftActorContext();
 247
 248         final TestActorRef<MessageCollectorActor> leaderCollectorActor = newLeaderCollectorActor(leaderRaftActor);
 249
 250         leaderActor.tell(new AddServer(NEW_SERVER_ID, newFollowerRaftActor.path().toString(), true), testKit.getRef());
 251
 252         // Leader should install snapshot - capture and verify ApplySnapshot contents
 253
 254         ApplySnapshot applySnapshot = expectFirstMatching(newFollowerCollectorActor, ApplySnapshot.class);
 255         List<Object> snapshotState = MockRaftActor.fromState(applySnapshot.getSnapshot().getState());
 256         assertEquals("Snapshot state", snapshotState, leaderRaftActor.getState());
 257
 258         AddServerReply addServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 259         assertEquals("getStatus", ServerChangeStatus.OK, addServerReply.getStatus());
 260         assertEquals("getLeaderHint", LEADER_ID, addServerReply.getLeaderHint().get());
 261
 262         // Verify ServerConfigurationPayload entry in leader's log
 263
 264         expectFirstMatching(leaderCollectorActor, ApplyState.class);
 265         assertEquals("Leader journal last index", 2, leaderActorContext.getReplicatedLog().lastIndex());
 266         assertEquals("Leader commit index", 2, leaderActorContext.getCommitIndex());
 267         assertEquals("Leader last applied index", 2, leaderActorContext.getLastApplied());
 268         verifyServerConfigurationPayloadEntry(leaderActorContext.getReplicatedLog(), votingServer(LEADER_ID),
 269                 votingServer(NEW_SERVER_ID));
 270
 271         // Verify ServerConfigurationPayload entry in the new follower
 272
 273         expectFirstMatching(newFollowerCollectorActor, ApplyState.class);
 274         assertEquals("New follower journal last index", 2, newFollowerActorContext.getReplicatedLog().lastIndex());
 275         verifyServerConfigurationPayloadEntry(newFollowerActorContext.getReplicatedLog(), votingServer(LEADER_ID),
 276                 votingServer(NEW_SERVER_ID));
 277
 278         // Verify new server config was applied in the new follower
 279
 280         assertEquals("New follower peers", Sets.newHashSet(LEADER_ID), newFollowerActorContext.getPeerIds());
 281
 282         LOG.info("testAddServerWithNoExistingFollower ending");
 283     }
 284
 285     @Test
 286     public void testAddServersAsNonVoting() throws Exception {
 287         LOG.info("testAddServersAsNonVoting starting");
 288
 289         setupNewFollower();
 290         RaftActorContext initialActorContext = new MockRaftActorContext();
 291
 292         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 293                 MockLeaderRaftActor.props(ImmutableMap.<String, String>of(),
 294                         initialActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 295                 actorFactory.generateActorId(LEADER_ID));
 296
 297         MockLeaderRaftActor leaderRaftActor = leaderActor.underlyingActor();
 298         final RaftActorContext leaderActorContext = leaderRaftActor.getRaftActorContext();
 299
 300         final TestActorRef<MessageCollectorActor> leaderCollectorActor = newLeaderCollectorActor(leaderRaftActor);
 301
 302         leaderActor.tell(new AddServer(NEW_SERVER_ID, newFollowerRaftActor.path().toString(), false), testKit.getRef());
 303
 304         AddServerReply addServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 305         assertEquals("getStatus", ServerChangeStatus.OK, addServerReply.getStatus());
 306         assertEquals("getLeaderHint", LEADER_ID, addServerReply.getLeaderHint().get());
 307
 308         // Verify ServerConfigurationPayload entry in leader's log
 309
 310         expectFirstMatching(leaderCollectorActor, ApplyState.class);
 311
 312         assertEquals("Leader journal last index", 0, leaderActorContext.getReplicatedLog().lastIndex());
 313         assertEquals("Leader commit index", 0, leaderActorContext.getCommitIndex());
 314         assertEquals("Leader last applied index", 0, leaderActorContext.getLastApplied());
 315         verifyServerConfigurationPayloadEntry(leaderActorContext.getReplicatedLog(), votingServer(LEADER_ID),
 316                 nonVotingServer(NEW_SERVER_ID));
 317
 318         // Verify ServerConfigurationPayload entry in the new follower
 319
 320         expectFirstMatching(newFollowerCollectorActor, ApplyState.class);
 321         assertEquals("New follower journal last index", 0, newFollowerActorContext.getReplicatedLog().lastIndex());
 322         verifyServerConfigurationPayloadEntry(newFollowerActorContext.getReplicatedLog(), votingServer(LEADER_ID),
 323                 nonVotingServer(NEW_SERVER_ID));
 324
 325         // Verify new server config was applied in the new follower
 326
 327         assertEquals("New follower peers", Sets.newHashSet(LEADER_ID), newFollowerActorContext.getPeerIds());
 328
 329         assertNoneMatching(newFollowerCollectorActor, InstallSnapshot.class, 500);
 330
 331         // Add another non-voting server.
 332
 333         clearMessages(leaderCollectorActor);
 334
 335         RaftActorContext follower2ActorContext = newFollowerContext(NEW_SERVER_ID2, followerActor);
 336         Follower newFollower2 = new Follower(follower2ActorContext);
 337         followerActor.underlyingActor().setBehavior(newFollower2);
 338
 339         leaderActor.tell(new AddServer(NEW_SERVER_ID2, followerActor.path().toString(), false), testKit.getRef());
 340
 341         addServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 342         assertEquals("getStatus", ServerChangeStatus.OK, addServerReply.getStatus());
 343         assertEquals("getLeaderHint", java.util.Optional.of(LEADER_ID), addServerReply.getLeaderHint());
 344
 345         expectFirstMatching(leaderCollectorActor, ApplyState.class);
 346         assertEquals("Leader journal last index", 1, leaderActorContext.getReplicatedLog().lastIndex());
 347         assertEquals("Leader commit index", 1, leaderActorContext.getCommitIndex());
 348         assertEquals("Leader last applied index", 1, leaderActorContext.getLastApplied());
 349         verifyServerConfigurationPayloadEntry(leaderActorContext.getReplicatedLog(),
 350                 votingServer(LEADER_ID), nonVotingServer(NEW_SERVER_ID), nonVotingServer(NEW_SERVER_ID2));
 351
 352         LOG.info("testAddServersAsNonVoting ending");
 353     }
 354
 355     @Test
 356     public void testAddServerWithOperationInProgress() throws Exception {
 357         LOG.info("testAddServerWithOperationInProgress starting");
 358
 359         setupNewFollower();
 360         RaftActorContext initialActorContext = new MockRaftActorContext();
 361
 362         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 363                 MockLeaderRaftActor.props(ImmutableMap.<String, String>of(),
 364                         initialActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 365                 actorFactory.generateActorId(LEADER_ID));
 366
 367         MockLeaderRaftActor leaderRaftActor = leaderActor.underlyingActor();
 368         final RaftActorContext leaderActorContext = leaderRaftActor.getRaftActorContext();
 369
 370         final TestActorRef<MessageCollectorActor> leaderCollectorActor = newLeaderCollectorActor(leaderRaftActor);
 371
 372         RaftActorContext follower2ActorContext = newFollowerContext(NEW_SERVER_ID2, followerActor);
 373         Follower newFollower2 = new Follower(follower2ActorContext);
 374         followerActor.underlyingActor().setBehavior(newFollower2);
 375
 376         MockNewFollowerRaftActor newFollowerRaftActorInstance = newFollowerRaftActor.underlyingActor();
 377         newFollowerRaftActorInstance.setDropMessageOfType(InstallSnapshot.class);
 378
 379         leaderActor.tell(new AddServer(NEW_SERVER_ID, newFollowerRaftActor.path().toString(), true), testKit.getRef());
 380
 381         // Wait for leader's install snapshot and capture it
 382
 383         InstallSnapshot installSnapshot = expectFirstMatching(newFollowerCollectorActor, InstallSnapshot.class);
 384
 385         // Send a second AddServer - should get queued
 386         JavaTestKit testKit2 = new JavaTestKit(getSystem());
 387         leaderActor.tell(new AddServer(NEW_SERVER_ID2, followerActor.path().toString(), false), testKit2.getRef());
 388
 389         // Continue the first AddServer
 390         newFollowerRaftActorInstance.setDropMessageOfType(null);
 391         newFollowerRaftActor.tell(installSnapshot, leaderActor);
 392
 393         // Verify both complete successfully
 394         AddServerReply addServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 395         assertEquals("getStatus", ServerChangeStatus.OK, addServerReply.getStatus());
 396
 397         addServerReply = testKit2.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 398         assertEquals("getStatus", ServerChangeStatus.OK, addServerReply.getStatus());
 399
 400         // Verify ServerConfigurationPayload entries in leader's log
 401
 402         expectMatching(leaderCollectorActor, ApplyState.class, 2);
 403         assertEquals("Leader journal last index", 1, leaderActorContext.getReplicatedLog().lastIndex());
 404         assertEquals("Leader commit index", 1, leaderActorContext.getCommitIndex());
 405         assertEquals("Leader last applied index", 1, leaderActorContext.getLastApplied());
 406         verifyServerConfigurationPayloadEntry(leaderActorContext.getReplicatedLog(),
 407                 votingServer(LEADER_ID), votingServer(NEW_SERVER_ID), nonVotingServer(NEW_SERVER_ID2));
 408
 409         // Verify ServerConfigurationPayload entry in the new follower
 410
 411         expectMatching(newFollowerCollectorActor, ApplyState.class, 2);
 412         assertEquals("New follower peers", Sets.newHashSet(LEADER_ID, NEW_SERVER_ID2),
 413                newFollowerActorContext.getPeerIds());
 414
 415         LOG.info("testAddServerWithOperationInProgress ending");
 416     }
 417
 418     @Test
 419     public void testAddServerWithPriorSnapshotInProgress() throws Exception {
 420         LOG.info("testAddServerWithPriorSnapshotInProgress starting");
 421
 422         setupNewFollower();
 423         RaftActorContext initialActorContext = new MockRaftActorContext();
 424
 425         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 426                 MockLeaderRaftActor.props(ImmutableMap.<String, String>of(),
 427                         initialActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 428                 actorFactory.generateActorId(LEADER_ID));
 429
 430         MockLeaderRaftActor leaderRaftActor = leaderActor.underlyingActor();
 431         final RaftActorContext leaderActorContext = leaderRaftActor.getRaftActorContext();
 432
 433         TestActorRef<MessageCollectorActor> leaderCollectorActor = newLeaderCollectorActor(leaderRaftActor);
 434
 435         // Drop commit message for now to delay snapshot completion
 436         leaderRaftActor.setDropMessageOfType(String.class);
 437
 438         leaderActor.tell(new InitiateCaptureSnapshot(), leaderActor);
 439
 440         Object commitMsg = expectFirstMatching(leaderCollectorActor, COMMIT_MESSAGE_CLASS);
 441
 442         leaderActor.tell(new AddServer(NEW_SERVER_ID, newFollowerRaftActor.path().toString(), true), testKit.getRef());
 443
 444         leaderRaftActor.setDropMessageOfType(null);
 445         leaderActor.tell(commitMsg, leaderActor);
 446
 447         AddServerReply addServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 448         assertEquals("getStatus", ServerChangeStatus.OK, addServerReply.getStatus());
 449         assertEquals("getLeaderHint", LEADER_ID, addServerReply.getLeaderHint().get());
 450
 451         expectFirstMatching(newFollowerCollectorActor, ApplySnapshot.class);
 452
 453         // Verify ServerConfigurationPayload entry in leader's log
 454
 455         expectFirstMatching(leaderCollectorActor, ApplyState.class);
 456         assertEquals("Leader journal last index", 0, leaderActorContext.getReplicatedLog().lastIndex());
 457         assertEquals("Leader commit index", 0, leaderActorContext.getCommitIndex());
 458         assertEquals("Leader last applied index", 0, leaderActorContext.getLastApplied());
 459         verifyServerConfigurationPayloadEntry(leaderActorContext.getReplicatedLog(), votingServer(LEADER_ID),
 460                 votingServer(NEW_SERVER_ID));
 461
 462         LOG.info("testAddServerWithPriorSnapshotInProgress ending");
 463     }
 464
 465     @Test
 466     public void testAddServerWithPriorSnapshotCompleteTimeout() throws Exception {
 467         LOG.info("testAddServerWithPriorSnapshotCompleteTimeout starting");
 468
 469         setupNewFollower();
 470         RaftActorContext initialActorContext = new MockRaftActorContext();
 471
 472         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 473                 MockLeaderRaftActor.props(ImmutableMap.<String, String>of(),
 474                         initialActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 475                 actorFactory.generateActorId(LEADER_ID));
 476
 477         MockLeaderRaftActor leaderRaftActor = leaderActor.underlyingActor();
 478         RaftActorContext leaderActorContext = leaderRaftActor.getRaftActorContext();
 479
 480         ((DefaultConfigParamsImpl)leaderActorContext.getConfigParams()).setElectionTimeoutFactor(1);
 481
 482         // Drop commit message so the snapshot doesn't complete.
 483         leaderRaftActor.setDropMessageOfType(COMMIT_MESSAGE_CLASS);
 484
 485         leaderActor.tell(new InitiateCaptureSnapshot(), leaderActor);
 486
 487         leaderActor.tell(new AddServer(NEW_SERVER_ID, newFollowerRaftActor.path().toString(), true), testKit.getRef());
 488
 489         AddServerReply addServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 490         assertEquals("getStatus", ServerChangeStatus.TIMEOUT, addServerReply.getStatus());
 491
 492         assertEquals("Leader peers size", 0, leaderActorContext.getPeerIds().size());
 493
 494         LOG.info("testAddServerWithPriorSnapshotCompleteTimeout ending");
 495     }
 496
 497     @Test
 498     public void testAddServerWithLeaderChangeBeforePriorSnapshotComplete() throws Exception {
 499         LOG.info("testAddServerWithLeaderChangeBeforePriorSnapshotComplete starting");
 500
 501         setupNewFollower();
 502         RaftActorContext initialActorContext = new MockRaftActorContext();
 503
 504         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 505                 MockLeaderRaftActor.props(ImmutableMap.<String, String>of(),
 506                         initialActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 507                 actorFactory.generateActorId(LEADER_ID));
 508
 509         MockLeaderRaftActor leaderRaftActor = leaderActor.underlyingActor();
 510         RaftActorContext leaderActorContext = leaderRaftActor.getRaftActorContext();
 511         ((DefaultConfigParamsImpl)leaderActorContext.getConfigParams()).setElectionTimeoutFactor(100);
 512
 513         final TestActorRef<MessageCollectorActor> leaderCollectorActor = newLeaderCollectorActor(leaderRaftActor);
 514
 515         // Drop the commit message so the snapshot doesn't complete yet.
 516         leaderRaftActor.setDropMessageOfType(COMMIT_MESSAGE_CLASS);
 517
 518         leaderActor.tell(new InitiateCaptureSnapshot(), leaderActor);
 519
 520         leaderActor.tell(new AddServer(NEW_SERVER_ID, newFollowerRaftActor.path().toString(), true), testKit.getRef());
 521
 522         Object commitMsg = expectFirstMatching(leaderCollectorActor, COMMIT_MESSAGE_CLASS);
 523
 524         // Change the leader behavior to follower
 525         leaderActor.tell(new Follower(leaderActorContext), leaderActor);
 526
 527         // Drop CaptureSnapshotReply in case install snapshot is incorrectly initiated after the prior
 528         // snapshot completes. This will prevent the invalid snapshot from completing and fail the
 529         // isCapturing assertion below.
 530         leaderRaftActor.setDropMessageOfType(CaptureSnapshotReply.class);
 531
 532         // Complete the prior snapshot - this should be a no-op b/c it's no longer the leader
 533         leaderActor.tell(commitMsg, leaderActor);
 534
 535         leaderActor.tell(new RaftActorServerConfigurationSupport.ServerOperationTimeout(NEW_SERVER_ID), leaderActor);
 536
 537         AddServerReply addServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 538         assertEquals("getStatus", ServerChangeStatus.NO_LEADER, addServerReply.getStatus());
 539
 540         assertEquals("Leader peers size", 0, leaderActorContext.getPeerIds().size());
 541         assertEquals("isCapturing", false, leaderActorContext.getSnapshotManager().isCapturing());
 542
 543         LOG.info("testAddServerWithLeaderChangeBeforePriorSnapshotComplete ending");
 544     }
 545
 546     @Test
 547     public void testAddServerWithLeaderChangeDuringInstallSnapshot() throws Exception {
 548         LOG.info("testAddServerWithLeaderChangeDuringInstallSnapshot starting");
 549
 550         setupNewFollower();
 551         RaftActorContext initialActorContext = new MockRaftActorContext();
 552
 553         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 554                 MockLeaderRaftActor.props(ImmutableMap.<String, String>of(),
 555                         initialActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 556                 actorFactory.generateActorId(LEADER_ID));
 557
 558         MockLeaderRaftActor leaderRaftActor = leaderActor.underlyingActor();
 559         RaftActorContext leaderActorContext = leaderRaftActor.getRaftActorContext();
 560
 561         ((DefaultConfigParamsImpl)leaderActorContext.getConfigParams()).setElectionTimeoutFactor(8);
 562
 563         TestActorRef<MessageCollectorActor> leaderCollectorActor = newLeaderCollectorActor(leaderRaftActor);
 564
 565         // Drop the UnInitializedFollowerSnapshotReply to delay it.
 566         leaderRaftActor.setDropMessageOfType(UnInitializedFollowerSnapshotReply.class);
 567
 568         leaderActor.tell(new AddServer(NEW_SERVER_ID, newFollowerRaftActor.path().toString(), true), testKit.getRef());
 569
 570         final UnInitializedFollowerSnapshotReply snapshotReply = expectFirstMatching(leaderCollectorActor,
 571                 UnInitializedFollowerSnapshotReply.class);
 572
 573         // Prevent election timeout when the leader switches to follower
 574         ((DefaultConfigParamsImpl)leaderActorContext.getConfigParams()).setElectionTimeoutFactor(100);
 575
 576         // Change the leader behavior to follower
 577         leaderActor.tell(new Follower(leaderActorContext), leaderActor);
 578
 579         // Send the captured UnInitializedFollowerSnapshotReply - should be a no-op
 580         leaderRaftActor.setDropMessageOfType(null);
 581         leaderActor.tell(snapshotReply, leaderActor);
 582
 583         AddServerReply addServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 584         assertEquals("getStatus", ServerChangeStatus.NO_LEADER, addServerReply.getStatus());
 585
 586         assertEquals("Leader peers size", 0, leaderActorContext.getPeerIds().size());
 587
 588         LOG.info("testAddServerWithLeaderChangeDuringInstallSnapshot ending");
 589     }
 590
 591     @Test
 592     public void testAddServerWithInstallSnapshotTimeout() throws Exception {
 593         LOG.info("testAddServerWithInstallSnapshotTimeout starting");
 594
 595         setupNewFollower();
 596         RaftActorContext initialActorContext = new MockRaftActorContext();
 597
 598         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 599                 MockLeaderRaftActor.props(ImmutableMap.<String, String>of(),
 600                         initialActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 601                 actorFactory.generateActorId(LEADER_ID));
 602
 603         MockLeaderRaftActor leaderRaftActor = leaderActor.underlyingActor();
 604         RaftActorContext leaderActorContext = leaderRaftActor.getRaftActorContext();
 605         ((DefaultConfigParamsImpl)leaderActorContext.getConfigParams()).setElectionTimeoutFactor(1);
 606
 607         // Drop the InstallSnapshot message so it times out
 608         newFollowerRaftActor.underlyingActor().setDropMessageOfType(InstallSnapshot.class);
 609
 610         leaderActor.tell(new AddServer(NEW_SERVER_ID, newFollowerRaftActor.path().toString(), true), testKit.getRef());
 611
 612         leaderActor.tell(new UnInitializedFollowerSnapshotReply("bogus"), leaderActor);
 613
 614         AddServerReply addServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 615         assertEquals("getStatus", ServerChangeStatus.TIMEOUT, addServerReply.getStatus());
 616
 617         assertEquals("Leader peers size", 0, leaderActorContext.getPeerIds().size());
 618         assertEquals("Leader followers size", 0,
 619                 ((AbstractLeader)leaderRaftActor.getCurrentBehavior()).getFollowerIds().size());
 620
 621         LOG.info("testAddServerWithInstallSnapshotTimeout ending");
 622     }
 623
 624     @Test
 625     public void testAddServerWithNoLeader() {
 626         LOG.info("testAddServerWithNoLeader starting");
 627
 628         setupNewFollower();
 629         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
 630         configParams.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 631
 632         TestActorRef<MockRaftActor> noLeaderActor = actorFactory.createTestActor(
 633                 MockRaftActor.builder().id(LEADER_ID).peerAddresses(ImmutableMap.of(FOLLOWER_ID,
 634                         followerActor.path().toString())).config(configParams).persistent(Optional.of(false))
 635                         .props().withDispatcher(Dispatchers.DefaultDispatcherId()),
 636                 actorFactory.generateActorId(LEADER_ID));
 637         noLeaderActor.underlyingActor().waitForInitializeBehaviorComplete();
 638
 639         noLeaderActor.tell(new AddServer(NEW_SERVER_ID, newFollowerRaftActor.path().toString(), true),
 640                 testKit.getRef());
 641         AddServerReply addServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 642         assertEquals("getStatus", ServerChangeStatus.NO_LEADER, addServerReply.getStatus());
 643
 644         LOG.info("testAddServerWithNoLeader ending");
 645     }
 646
 647     @Test
 648     public void testAddServerWithNoConsensusReached() {
 649         LOG.info("testAddServerWithNoConsensusReached starting");
 650
 651         setupNewFollower();
 652         RaftActorContext initialActorContext = new MockRaftActorContext();
 653
 654         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 655                 MockLeaderRaftActor.props(ImmutableMap.<String, String>of(),
 656                         initialActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 657                 actorFactory.generateActorId(LEADER_ID));
 658
 659         MockLeaderRaftActor leaderRaftActor = leaderActor.underlyingActor();
 660         final RaftActorContext leaderActorContext = leaderRaftActor.getRaftActorContext();
 661
 662         final TestActorRef<MessageCollectorActor> leaderCollectorActor = newLeaderCollectorActor(leaderRaftActor);
 663
 664         // Drop UnInitializedFollowerSnapshotReply initially
 665         leaderRaftActor.setDropMessageOfType(UnInitializedFollowerSnapshotReply.class);
 666
 667         MockNewFollowerRaftActor newFollowerRaftActorInstance = newFollowerRaftActor.underlyingActor();
 668         newFollowerCollectorActor = newCollectorActor(newFollowerRaftActorInstance, NEW_SERVER_ID);
 669
 670         // Drop AppendEntries to the new follower so consensus isn't reached
 671         newFollowerRaftActorInstance.setDropMessageOfType(AppendEntries.class);
 672
 673         leaderActor.tell(new AddServer(NEW_SERVER_ID, newFollowerRaftActor.path().toString(), true), testKit.getRef());
 674
 675         // Capture the UnInitializedFollowerSnapshotReply
 676         Object snapshotReply = expectFirstMatching(leaderCollectorActor, UnInitializedFollowerSnapshotReply.class);
 677
 678         // Send the UnInitializedFollowerSnapshotReply to resume the first request
 679         leaderRaftActor.setDropMessageOfType(null);
 680         leaderActor.tell(snapshotReply, leaderActor);
 681
 682         expectFirstMatching(newFollowerCollectorActor, AppendEntries.class);
 683
 684         // Send a second AddServer
 685         leaderActor.tell(new AddServer(NEW_SERVER_ID2, "", false), testKit.getRef());
 686
 687         // The first AddServer should succeed with OK even though consensus wasn't reached
 688         AddServerReply addServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 689         assertEquals("getStatus", ServerChangeStatus.OK, addServerReply.getStatus());
 690         assertEquals("getLeaderHint", LEADER_ID, addServerReply.getLeaderHint().get());
 691
 692         // Verify ServerConfigurationPayload entry in leader's log
 693         verifyServerConfigurationPayloadEntry(leaderActorContext.getReplicatedLog(), votingServer(LEADER_ID),
 694                 votingServer(NEW_SERVER_ID));
 695
 696         // The second AddServer should fail since consensus wasn't reached for the first
 697         addServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 698         assertEquals("getStatus", ServerChangeStatus.PRIOR_REQUEST_CONSENSUS_TIMEOUT, addServerReply.getStatus());
 699
 700         // Re-send the second AddServer - should also fail
 701         leaderActor.tell(new AddServer(NEW_SERVER_ID2, "", false), testKit.getRef());
 702         addServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 703         assertEquals("getStatus", ServerChangeStatus.PRIOR_REQUEST_CONSENSUS_TIMEOUT, addServerReply.getStatus());
 704
 705         LOG.info("testAddServerWithNoConsensusReached ending");
 706     }
 707
 708     @Test
 709     public void testAddServerWithExistingServer() {
 710         LOG.info("testAddServerWithExistingServer starting");
 711
 712         RaftActorContext initialActorContext = new MockRaftActorContext();
 713
 714         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 715                 MockLeaderRaftActor.props(ImmutableMap.of(FOLLOWER_ID, followerActor.path().toString()),
 716                         initialActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 717                 actorFactory.generateActorId(LEADER_ID));
 718
 719         leaderActor.tell(new AddServer(FOLLOWER_ID, followerActor.path().toString(), true), testKit.getRef());
 720
 721         AddServerReply addServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 722         assertEquals("getStatus", ServerChangeStatus.ALREADY_EXISTS, addServerReply.getStatus());
 723
 724         LOG.info("testAddServerWithExistingServer ending");
 725     }
 726
 727     @Test
 728     public void testAddServerForwardedToLeader() {
 729         LOG.info("testAddServerForwardedToLeader starting");
 730
 731         setupNewFollower();
 732         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
 733         configParams.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 734
 735         TestActorRef<MessageCollectorActor> leaderActor = actorFactory.createTestActor(
 736                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
 737                 actorFactory.generateActorId(LEADER_ID));
 738
 739         TestActorRef<MockRaftActor> followerRaftActor = actorFactory.createTestActor(
 740                 MockRaftActor.builder().id(FOLLOWER_ID).peerAddresses(ImmutableMap.of(LEADER_ID,
 741                         leaderActor.path().toString())).config(configParams).persistent(Optional.of(false))
 742                         .props().withDispatcher(Dispatchers.DefaultDispatcherId()),
 743                 actorFactory.generateActorId(FOLLOWER_ID));
 744         followerRaftActor.underlyingActor().waitForInitializeBehaviorComplete();
 745
 746         followerRaftActor.tell(new AppendEntries(1, LEADER_ID, 0, 1, Collections.<ReplicatedLogEntry>emptyList(),
 747                 -1, -1, (short)0), leaderActor);
 748
 749         followerRaftActor.tell(new AddServer(NEW_SERVER_ID, newFollowerRaftActor.path().toString(), true),
 750                 testKit.getRef());
 751         expectFirstMatching(leaderActor, AddServer.class);
 752
 753         LOG.info("testAddServerForwardedToLeader ending");
 754     }
 755
 756     @Test
 757     public void testOnApplyState() {
 758         LOG.info("testOnApplyState starting");
 759
 760         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
 761         configParams.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 762         TestActorRef<MockRaftActor> noLeaderActor = actorFactory.createTestActor(
 763                 MockRaftActor.builder().id(LEADER_ID).peerAddresses(ImmutableMap.of(FOLLOWER_ID,
 764                         followerActor.path().toString())).config(configParams).persistent(Optional.of(false))
 765                         .props().withDispatcher(Dispatchers.DefaultDispatcherId()),
 766                 actorFactory.generateActorId(LEADER_ID));
 767
 768         RaftActorServerConfigurationSupport support = new RaftActorServerConfigurationSupport(
 769                 noLeaderActor.underlyingActor());
 770
 771         ReplicatedLogEntry serverConfigEntry = new SimpleReplicatedLogEntry(1, 1,
 772                 new ServerConfigurationPayload(Collections.<ServerInfo>emptyList()));
 773         boolean handled = support.handleMessage(new ApplyState(null, null, serverConfigEntry), ActorRef.noSender());
 774         assertEquals("Message handled", true, handled);
 775
 776         ReplicatedLogEntry nonServerConfigEntry = new SimpleReplicatedLogEntry(1, 1,
 777                 new MockRaftActorContext.MockPayload("1"));
 778         handled = support.handleMessage(new ApplyState(null, null, nonServerConfigEntry), ActorRef.noSender());
 779         assertEquals("Message handled", false, handled);
 780
 781         LOG.info("testOnApplyState ending");
 782     }
 783
 784     @Test
 785     public void testRemoveServerWithNoLeader() {
 786         LOG.info("testRemoveServerWithNoLeader starting");
 787
 788         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
 789         configParams.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 790
 791         TestActorRef<MockRaftActor> leaderActor = actorFactory.createTestActor(
 792                 MockRaftActor.builder().id(LEADER_ID).peerAddresses(ImmutableMap.of(FOLLOWER_ID,
 793                         followerActor.path().toString())).config(configParams).persistent(Optional.of(false))
 794                         .props().withDispatcher(Dispatchers.DefaultDispatcherId()),
 795                 actorFactory.generateActorId(LEADER_ID));
 796         leaderActor.underlyingActor().waitForInitializeBehaviorComplete();
 797
 798         leaderActor.tell(new RemoveServer(FOLLOWER_ID), testKit.getRef());
 799         RemoveServerReply removeServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"),
 800                 RemoveServerReply.class);
 801         assertEquals("getStatus", ServerChangeStatus.NO_LEADER, removeServerReply.getStatus());
 802
 803         LOG.info("testRemoveServerWithNoLeader ending");
 804     }
 805
 806     @Test
 807     public void testRemoveServerNonExistentServer() {
 808         LOG.info("testRemoveServerNonExistentServer starting");
 809
 810         RaftActorContext initialActorContext = new MockRaftActorContext();
 811
 812         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 813                 MockLeaderRaftActor.props(ImmutableMap.of(FOLLOWER_ID, followerActor.path().toString()),
 814                         initialActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 815                 actorFactory.generateActorId(LEADER_ID));
 816
 817         leaderActor.tell(new RemoveServer(NEW_SERVER_ID), testKit.getRef());
 818         RemoveServerReply removeServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"),
 819                 RemoveServerReply.class);
 820         assertEquals("getStatus", ServerChangeStatus.DOES_NOT_EXIST, removeServerReply.getStatus());
 821
 822         LOG.info("testRemoveServerNonExistentServer ending");
 823     }
 824
 825     @Test
 826     public void testRemoveServerForwardToLeader() {
 827         LOG.info("testRemoveServerForwardToLeader starting");
 828
 829         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
 830         configParams.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 831
 832         TestActorRef<MessageCollectorActor> leaderActor = actorFactory.createTestActor(
 833                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
 834                 actorFactory.generateActorId(LEADER_ID));
 835
 836         TestActorRef<MockRaftActor> followerRaftActor = actorFactory.createTestActor(
 837                 MockRaftActor.builder().id(FOLLOWER_ID).peerAddresses(ImmutableMap.of(LEADER_ID,
 838                         leaderActor.path().toString())).config(configParams).persistent(Optional.of(false))
 839                         .props().withDispatcher(Dispatchers.DefaultDispatcherId()),
 840                 actorFactory.generateActorId(FOLLOWER_ID));
 841         followerRaftActor.underlyingActor().waitForInitializeBehaviorComplete();
 842
 843         followerRaftActor.tell(new AppendEntries(1, LEADER_ID, 0, 1, Collections.<ReplicatedLogEntry>emptyList(),
 844                 -1, -1, (short)0), leaderActor);
 845
 846         followerRaftActor.tell(new RemoveServer(FOLLOWER_ID), testKit.getRef());
 847         expectFirstMatching(leaderActor, RemoveServer.class);
 848
 849         LOG.info("testRemoveServerForwardToLeader ending");
 850     }
 851
 852     @Test
 853     public void testRemoveServer() throws Exception {
 854         LOG.info("testRemoveServer starting");
 855
 856         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
 857         configParams.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 858         configParams.setCustomRaftPolicyImplementationClass(DisableElectionsRaftPolicy.class.getName());
 859
 860         final String follower1ActorId = actorFactory.generateActorId(FOLLOWER_ID);
 861         final String follower1ActorPath = actorFactory.createTestActorPath(follower1ActorId);
 862         final String follower2ActorId = actorFactory.generateActorId(FOLLOWER_ID2);
 863         final String follower2ActorPath = actorFactory.createTestActorPath(follower2ActorId);
 864         RaftActorContext initialActorContext = new MockRaftActorContext();
 865
 866         final String downNodeId = "downNode";
 867         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(MockLeaderRaftActor.props(
 868                 ImmutableMap.of(FOLLOWER_ID, follower1ActorPath, FOLLOWER_ID2, follower2ActorPath, downNodeId, ""),
 869                         initialActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 870                 actorFactory.generateActorId(LEADER_ID));
 871
 872         final TestActorRef<MessageCollectorActor> leaderCollector =
 873                 newLeaderCollectorActor(leaderActor.underlyingActor());
 874
 875         TestActorRef<MessageCollectorActor> follower1Collector = actorFactory.createTestActor(
 876                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
 877                         actorFactory.generateActorId("collector"));
 878         final TestActorRef<CollectingMockRaftActor> follower1Actor = actorFactory.createTestActor(
 879                 CollectingMockRaftActor.props(FOLLOWER_ID, ImmutableMap.of(LEADER_ID, leaderActor.path().toString(),
 880                         FOLLOWER_ID2, follower2ActorPath, downNodeId, ""), configParams, NO_PERSISTENCE,
 881                         follower1Collector).withDispatcher(Dispatchers.DefaultDispatcherId()), follower1ActorId);
 882
 883         TestActorRef<MessageCollectorActor> follower2Collector = actorFactory.createTestActor(
 884                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
 885                         actorFactory.generateActorId("collector"));
 886         final TestActorRef<CollectingMockRaftActor> follower2Actor = actorFactory.createTestActor(
 887                 CollectingMockRaftActor.props(FOLLOWER_ID2, ImmutableMap.of(LEADER_ID, leaderActor.path().toString(),
 888                         FOLLOWER_ID, follower1ActorPath, downNodeId, ""), configParams, NO_PERSISTENCE,
 889                         follower2Collector).withDispatcher(Dispatchers.DefaultDispatcherId()), follower2ActorId);
 890
 891         leaderActor.underlyingActor().waitForInitializeBehaviorComplete();
 892         follower1Actor.underlyingActor().waitForInitializeBehaviorComplete();
 893         follower2Actor.underlyingActor().waitForInitializeBehaviorComplete();
 894
 895         leaderActor.tell(new RemoveServer(FOLLOWER_ID), testKit.getRef());
 896         RemoveServerReply removeServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"),
 897                 RemoveServerReply.class);
 898         assertEquals("getStatus", ServerChangeStatus.OK, removeServerReply.getStatus());
 899
 900         ApplyState applyState = MessageCollectorActor.expectFirstMatching(leaderCollector, ApplyState.class);
 901         assertEquals(0L, applyState.getReplicatedLogEntry().getIndex());
 902         verifyServerConfigurationPayloadEntry(leaderActor.underlyingActor().getRaftActorContext().getReplicatedLog(),
 903                 votingServer(LEADER_ID), votingServer(FOLLOWER_ID2), votingServer(downNodeId));
 904
 905         applyState = MessageCollectorActor.expectFirstMatching(follower2Collector, ApplyState.class);
 906         assertEquals(0L, applyState.getReplicatedLogEntry().getIndex());
 907         verifyServerConfigurationPayloadEntry(leaderActor.underlyingActor().getRaftActorContext().getReplicatedLog(),
 908                 votingServer(LEADER_ID), votingServer(FOLLOWER_ID2), votingServer(downNodeId));
 909
 910         RaftActorBehavior currentBehavior = leaderActor.underlyingActor().getCurrentBehavior();
 911         assertTrue("Expected Leader", currentBehavior instanceof Leader);
 912         assertEquals("Follower ids size", 2, ((Leader)currentBehavior).getFollowerIds().size());
 913
 914         MessageCollectorActor.expectFirstMatching(follower1Collector, ServerRemoved.class);
 915
 916         LOG.info("testRemoveServer ending");
 917     }
 918
 919     @Test
 920     public void testRemoveServerLeader() {
 921         LOG.info("testRemoveServerLeader starting");
 922
 923         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
 924         configParams.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 925         configParams.setCustomRaftPolicyImplementationClass(DisableElectionsRaftPolicy.class.getName());
 926
 927         final String followerActorId = actorFactory.generateActorId(FOLLOWER_ID);
 928         final String followerActorPath = actorFactory.createTestActorPath(followerActorId);
 929         RaftActorContext initialActorContext = new MockRaftActorContext();
 930
 931         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 932                 MockLeaderRaftActor.props(ImmutableMap.of(FOLLOWER_ID, followerActorPath),
 933                         initialActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 934                 actorFactory.generateActorId(LEADER_ID));
 935
 936         final TestActorRef<MessageCollectorActor> leaderCollector =
 937                 newLeaderCollectorActor(leaderActor.underlyingActor());
 938
 939         final TestActorRef<MessageCollectorActor> followerCollector =
 940                 actorFactory.createTestActor(MessageCollectorActor.props()
 941                 .withDispatcher(Dispatchers.DefaultDispatcherId()), actorFactory.generateActorId("collector"));
 942         actorFactory.createTestActor(
 943                 CollectingMockRaftActor.props(FOLLOWER_ID, ImmutableMap.of(LEADER_ID, leaderActor.path().toString()),
 944                         configParams, NO_PERSISTENCE, followerCollector)
 945                         .withDispatcher(Dispatchers.DefaultDispatcherId()),
 946                 followerActorId);
 947
 948         leaderActor.tell(new RemoveServer(LEADER_ID), testKit.getRef());
 949         RemoveServerReply removeServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"),
 950                 RemoveServerReply.class);
 951         assertEquals("getStatus", ServerChangeStatus.OK, removeServerReply.getStatus());
 952
 953         final ApplyState applyState = MessageCollectorActor.expectFirstMatching(followerCollector, ApplyState.class);
 954         assertEquals(0L, applyState.getReplicatedLogEntry().getIndex());
 955         verifyServerConfigurationPayloadEntry(leaderActor.underlyingActor().getRaftActorContext().getReplicatedLog(),
 956                 votingServer(FOLLOWER_ID));
 957
 958         MessageCollectorActor.expectFirstMatching(leaderCollector, ServerRemoved.class);
 959
 960         LOG.info("testRemoveServerLeader ending");
 961     }
 962
 963     @Test
 964     public void testRemoveServerLeaderWithNoFollowers() {
 965         LOG.info("testRemoveServerLeaderWithNoFollowers starting");
 966
 967         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 968                 MockLeaderRaftActor.props(Collections.<String, String>emptyMap(),
 969                         new MockRaftActorContext()).withDispatcher(Dispatchers.DefaultDispatcherId()),
 970                 actorFactory.generateActorId(LEADER_ID));
 971
 972         leaderActor.tell(new RemoveServer(LEADER_ID), testKit.getRef());
 973         RemoveServerReply removeServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"),
 974                 RemoveServerReply.class);
 975         assertEquals("getStatus", ServerChangeStatus.NOT_SUPPORTED, removeServerReply.getStatus());
 976
 977         LOG.info("testRemoveServerLeaderWithNoFollowers ending");
 978     }
 979
 980     @Test
 981     public void testChangeServersVotingStatus() {
 982         LOG.info("testChangeServersVotingStatus starting");
 983
 984         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
 985         configParams.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 986         configParams.setCustomRaftPolicyImplementationClass(DisableElectionsRaftPolicy.class.getName());
 987
 988         final String follower1ActorId = actorFactory.generateActorId(FOLLOWER_ID);
 989         final String follower1ActorPath = actorFactory.createTestActorPath(follower1ActorId);
 990         final String follower2ActorId = actorFactory.generateActorId(FOLLOWER_ID2);
 991         final String follower2ActorPath = actorFactory.createTestActorPath(follower2ActorId);
 992
 993         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 994                 MockLeaderRaftActor.props(ImmutableMap.of(FOLLOWER_ID, follower1ActorPath,
 995                         FOLLOWER_ID2, follower2ActorPath), new MockRaftActorContext())
 996                         .withDispatcher(Dispatchers.DefaultDispatcherId()), actorFactory.generateActorId(LEADER_ID));
 997         TestActorRef<MessageCollectorActor> leaderCollector = newLeaderCollectorActor(leaderActor.underlyingActor());
 998
 999         TestActorRef<MessageCollectorActor> follower1Collector = actorFactory.createTestActor(
1000                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
1001                 actorFactory.generateActorId("collector"));
1002         final TestActorRef<CollectingMockRaftActor> follower1RaftActor = actorFactory.createTestActor(
1003                 CollectingMockRaftActor.props(FOLLOWER_ID, ImmutableMap.of(LEADER_ID, leaderActor.path().toString(),
1004                         FOLLOWER_ID2, follower2ActorPath), configParams, NO_PERSISTENCE, follower1Collector)
1005                         .withDispatcher(Dispatchers.DefaultDispatcherId()), follower1ActorId);
1006
1007         TestActorRef<MessageCollectorActor> follower2Collector = actorFactory.createTestActor(
1008                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
1009                 actorFactory.generateActorId("collector"));
1010         final TestActorRef<CollectingMockRaftActor> follower2RaftActor = actorFactory.createTestActor(
1011                 CollectingMockRaftActor.props(FOLLOWER_ID2, ImmutableMap.of(LEADER_ID, leaderActor.path().toString(),
1012                         FOLLOWER_ID, follower1ActorPath), configParams, NO_PERSISTENCE, follower2Collector)
1013                         .withDispatcher(Dispatchers.DefaultDispatcherId()), follower2ActorId);
1014
1015         // Send first ChangeServersVotingStatus message
1016
1017         leaderActor.tell(new ChangeServersVotingStatus(ImmutableMap.of(FOLLOWER_ID, false, FOLLOWER_ID2, false)),
1018                 testKit.getRef());
1019         ServerChangeReply reply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), ServerChangeReply.class);
1020         assertEquals("getStatus", ServerChangeStatus.OK, reply.getStatus());
1021
1022         final ApplyState applyState = MessageCollectorActor.expectFirstMatching(leaderCollector, ApplyState.class);
1023         assertEquals(0L, applyState.getReplicatedLogEntry().getIndex());
1024         verifyServerConfigurationPayloadEntry(leaderActor.underlyingActor().getRaftActorContext().getReplicatedLog(),
1025                 votingServer(LEADER_ID), nonVotingServer(FOLLOWER_ID), nonVotingServer(FOLLOWER_ID2));
1026
1027         MessageCollectorActor.expectFirstMatching(follower1Collector, ApplyState.class);
1028         verifyServerConfigurationPayloadEntry(follower1RaftActor.underlyingActor().getRaftActorContext()
1029                 .getReplicatedLog(), votingServer(LEADER_ID), nonVotingServer(FOLLOWER_ID),
1030                 nonVotingServer(FOLLOWER_ID2));
1031
1032         MessageCollectorActor.expectFirstMatching(follower2Collector, ApplyState.class);
1033         verifyServerConfigurationPayloadEntry(follower2RaftActor.underlyingActor().getRaftActorContext()
1034                 .getReplicatedLog(), votingServer(LEADER_ID), nonVotingServer(FOLLOWER_ID),
1035                 nonVotingServer(FOLLOWER_ID2));
1036
1037         MessageCollectorActor.clearMessages(leaderCollector);
1038         MessageCollectorActor.clearMessages(follower1Collector);
1039         MessageCollectorActor.clearMessages(follower2Collector);
1040
1041         // Send second ChangeServersVotingStatus message
1042
1043         leaderActor.tell(new ChangeServersVotingStatus(ImmutableMap.of(FOLLOWER_ID, true)), testKit.getRef());
1044         reply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), ServerChangeReply.class);
1045         assertEquals("getStatus", ServerChangeStatus.OK, reply.getStatus());
1046
1047         MessageCollectorActor.expectFirstMatching(leaderCollector, ApplyState.class);
1048         verifyServerConfigurationPayloadEntry(leaderActor.underlyingActor().getRaftActorContext().getReplicatedLog(),
1049                 votingServer(LEADER_ID), votingServer(FOLLOWER_ID), nonVotingServer(FOLLOWER_ID2));
1050
1051         MessageCollectorActor.expectFirstMatching(follower1Collector, ApplyState.class);
1052         verifyServerConfigurationPayloadEntry(follower1RaftActor.underlyingActor().getRaftActorContext()
1053                 .getReplicatedLog(), votingServer(LEADER_ID), votingServer(FOLLOWER_ID), nonVotingServer(FOLLOWER_ID2));
1054
1055         MessageCollectorActor.expectFirstMatching(follower2Collector, ApplyState.class);
1056         verifyServerConfigurationPayloadEntry(follower2RaftActor.underlyingActor().getRaftActorContext()
1057                 .getReplicatedLog(), votingServer(LEADER_ID), votingServer(FOLLOWER_ID), nonVotingServer(FOLLOWER_ID2));
1058
1059         LOG.info("testChangeServersVotingStatus ending");
1060     }
1061
1062     @Test
1063     public void testChangeLeaderToNonVoting() {
1064         LOG.info("testChangeLeaderToNonVoting starting");
1065
1066         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
1067         configParams.setHeartBeatInterval(new FiniteDuration(500, TimeUnit.MILLISECONDS));
1068
1069         final String follower1ActorId = actorFactory.generateActorId(FOLLOWER_ID);
1070         final String follower1ActorPath = actorFactory.createTestActorPath(follower1ActorId);
1071         final String follower2ActorId = actorFactory.generateActorId(FOLLOWER_ID2);
1072         final String follower2ActorPath = actorFactory.createTestActorPath(follower2ActorId);
1073
1074         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
1075                 MockLeaderRaftActor.props(ImmutableMap.of(FOLLOWER_ID, follower1ActorPath,
1076                         FOLLOWER_ID2, follower2ActorPath), new MockRaftActorContext())
1077                         .withDispatcher(Dispatchers.DefaultDispatcherId()), actorFactory.generateActorId(LEADER_ID));
1078         TestActorRef<MessageCollectorActor> leaderCollector = newLeaderCollectorActor(leaderActor.underlyingActor());
1079
1080         TestActorRef<MessageCollectorActor> follower1Collector = actorFactory.createTestActor(
1081                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
1082                 actorFactory.generateActorId("collector"));
1083         final TestActorRef<CollectingMockRaftActor> follower1RaftActor = actorFactory.createTestActor(
1084                 CollectingMockRaftActor.props(FOLLOWER_ID, ImmutableMap.of(LEADER_ID, leaderActor.path().toString(),
1085                         FOLLOWER_ID2, follower2ActorPath), configParams, NO_PERSISTENCE, follower1Collector)
1086                         .withDispatcher(Dispatchers.DefaultDispatcherId()), follower1ActorId);
1087
1088         TestActorRef<MessageCollectorActor> follower2Collector = actorFactory.createTestActor(
1089                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
1090                 actorFactory.generateActorId("collector"));
1091         final TestActorRef<CollectingMockRaftActor> follower2RaftActor = actorFactory.createTestActor(
1092                 CollectingMockRaftActor.props(FOLLOWER_ID2, ImmutableMap.of(LEADER_ID, leaderActor.path().toString(),
1093                         FOLLOWER_ID, follower1ActorPath), configParams, NO_PERSISTENCE, follower2Collector)
1094                         .withDispatcher(Dispatchers.DefaultDispatcherId()), follower2ActorId);
1095
1096         // Send ChangeServersVotingStatus message
1097
1098         leaderActor.tell(new ChangeServersVotingStatus(ImmutableMap.of(LEADER_ID, false)), testKit.getRef());
1099         ServerChangeReply reply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), ServerChangeReply.class);
1100         assertEquals("getStatus", ServerChangeStatus.OK, reply.getStatus());
1101
1102         MessageCollectorActor.expectFirstMatching(leaderCollector, ApplyState.class);
1103         verifyServerConfigurationPayloadEntry(leaderActor.underlyingActor().getRaftActorContext().getReplicatedLog(),
1104                 nonVotingServer(LEADER_ID), votingServer(FOLLOWER_ID), votingServer(FOLLOWER_ID2));
1105
1106         MessageCollectorActor.expectFirstMatching(follower1Collector, ApplyState.class);
1107         verifyServerConfigurationPayloadEntry(follower1RaftActor.underlyingActor().getRaftActorContext()
1108                 .getReplicatedLog(), nonVotingServer(LEADER_ID), votingServer(FOLLOWER_ID), votingServer(FOLLOWER_ID2));
1109
1110         MessageCollectorActor.expectFirstMatching(follower2Collector, ApplyState.class);
1111         verifyServerConfigurationPayloadEntry(follower2RaftActor.underlyingActor().getRaftActorContext()
1112                 .getReplicatedLog(), nonVotingServer(LEADER_ID), votingServer(FOLLOWER_ID), votingServer(FOLLOWER_ID2));
1113
1114         verifyRaftState(RaftState.Leader, follower1RaftActor.underlyingActor(), follower2RaftActor.underlyingActor());
1115         verifyRaftState(RaftState.Follower, leaderActor.underlyingActor());
1116
1117         MessageCollectorActor.expectMatching(leaderCollector, AppendEntries.class, 2);
1118
1119         LOG.info("testChangeLeaderToNonVoting ending");
1120     }
1121
1122     @Test
1123     public void testChangeLeaderToNonVotingInSingleNode() {
1124         LOG.info("testChangeLeaderToNonVotingInSingleNode starting");
1125
1126         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
1127                 MockLeaderRaftActor.props(ImmutableMap.of(), new MockRaftActorContext())
1128                         .withDispatcher(Dispatchers.DefaultDispatcherId()), actorFactory.generateActorId(LEADER_ID));
1129
1130         leaderActor.tell(new ChangeServersVotingStatus(ImmutableMap.of(LEADER_ID, false)), testKit.getRef());
1131         ServerChangeReply reply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), ServerChangeReply.class);
1132         assertEquals("getStatus", ServerChangeStatus.INVALID_REQUEST, reply.getStatus());
1133
1134         LOG.info("testChangeLeaderToNonVotingInSingleNode ending");
1135     }
1136
1137     @Test
1138     public void testChangeToVotingWithNoLeader() {
1139         LOG.info("testChangeToVotingWithNoLeader starting");
1140
1141         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
1142         configParams.setHeartBeatInterval(new FiniteDuration(100, TimeUnit.MILLISECONDS));
1143         configParams.setElectionTimeoutFactor(5);
1144
1145         final String node1ID = "node1";
1146         final String node2ID = "node2";
1147
1148         // Set up a persisted ServerConfigurationPayload. Initially node1 and node2 will come up as non-voting.
1149         // via the server config. The server config will also contain 2 voting peers that are down (ie no
1150         // actors created).
1151
1152         ServerConfigurationPayload persistedServerConfig = new ServerConfigurationPayload(Arrays.asList(
1153                 new ServerInfo(node1ID, false), new ServerInfo(node2ID, false),
1154                 new ServerInfo("downNode1", true), new ServerInfo("downNode2", true)));
1155         SimpleReplicatedLogEntry persistedServerConfigEntry = new SimpleReplicatedLogEntry(0, 1, persistedServerConfig);
1156
1157         InMemoryJournal.addEntry(node1ID, 1, new UpdateElectionTerm(1, "downNode1"));
1158         InMemoryJournal.addEntry(node1ID, 2, persistedServerConfigEntry);
1159         InMemoryJournal.addEntry(node1ID, 3, new ApplyJournalEntries(0));
1160         InMemoryJournal.addEntry(node2ID, 1, new UpdateElectionTerm(1, "downNode2"));
1161         InMemoryJournal.addEntry(node2ID, 2, persistedServerConfigEntry);
1162         InMemoryJournal.addEntry(node2ID, 3, new ApplyJournalEntries(0));
1163
1164         TestActorRef<MessageCollectorActor> node1Collector = actorFactory.createTestActor(
1165                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
1166                 actorFactory.generateActorId("collector"));
1167         TestActorRef<CollectingMockRaftActor> node1RaftActorRef = actorFactory.createTestActor(
1168                 CollectingMockRaftActor.props(node1ID, ImmutableMap.<String, String>of(), configParams,
1169                         PERSISTENT, node1Collector).withDispatcher(Dispatchers.DefaultDispatcherId()), node1ID);
1170         CollectingMockRaftActor node1RaftActor = node1RaftActorRef.underlyingActor();
1171
1172         TestActorRef<MessageCollectorActor> node2Collector = actorFactory.createTestActor(
1173                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
1174                 actorFactory.generateActorId("collector"));
1175         TestActorRef<CollectingMockRaftActor> node2RaftActorRef = actorFactory.createTestActor(
1176                 CollectingMockRaftActor.props(node2ID, ImmutableMap.<String, String>of(), configParams,
1177                         PERSISTENT, node2Collector).withDispatcher(Dispatchers.DefaultDispatcherId()), node2ID);
1178         CollectingMockRaftActor node2RaftActor = node2RaftActorRef.underlyingActor();
1179
1180         node1RaftActor.waitForInitializeBehaviorComplete();
1181         node2RaftActor.waitForInitializeBehaviorComplete();
1182
1183         // Verify the intended server config was loaded and applied.
1184         verifyServerConfigurationPayloadEntry(node1RaftActor.getRaftActorContext().getReplicatedLog(),
1185                 nonVotingServer(node1ID), nonVotingServer(node2ID), votingServer("downNode1"),
1186                 votingServer("downNode2"));
1187         assertEquals("isVotingMember", false, node1RaftActor.getRaftActorContext().isVotingMember());
1188         assertEquals("getRaftState", RaftState.Follower, node1RaftActor.getRaftState());
1189         assertEquals("getLeaderId", null, node1RaftActor.getLeaderId());
1190
1191         verifyServerConfigurationPayloadEntry(node2RaftActor.getRaftActorContext().getReplicatedLog(),
1192                 nonVotingServer(node1ID), nonVotingServer(node2ID), votingServer("downNode1"),
1193                 votingServer("downNode2"));
1194         assertEquals("isVotingMember", false, node2RaftActor.getRaftActorContext().isVotingMember());
1195
1196         // For the test, we send a ChangeServersVotingStatus message to node1 to flip the voting states for
1197         // each server, ie node1 and node2 to voting and the 2 down nodes to non-voting. This should cause
1198         // node1 to try to elect itself as leader in order to apply the new server config. Since the 2
1199         // down nodes are switched to non-voting, node1 should only need a vote from node2.
1200
1201         // First send the message such that node1 has no peer address for node2 - should fail.
1202
1203         ChangeServersVotingStatus changeServers = new ChangeServersVotingStatus(ImmutableMap.of(node1ID, true,
1204                 node2ID, true, "downNode1", false, "downNode2", false));
1205         node1RaftActorRef.tell(changeServers, testKit.getRef());
1206         ServerChangeReply reply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), ServerChangeReply.class);
1207         assertEquals("getStatus", ServerChangeStatus.NO_LEADER, reply.getStatus());
1208
1209         // Send an AppendEntries so node1 has a leaderId
1210
1211         MessageCollectorActor.clearMessages(node1Collector);
1212
1213         long term = node1RaftActor.getRaftActorContext().getTermInformation().getCurrentTerm();
1214         node1RaftActorRef.tell(new AppendEntries(term, "downNode1", -1L, -1L,
1215                 Collections.<ReplicatedLogEntry>emptyList(), 0, -1, (short)1), ActorRef.noSender());
1216
1217         // Wait for the ElectionTimeout to clear the leaderId. he leaderId must be null so on the
1218         // ChangeServersVotingStatus message, it will try to elect a leader.
1219
1220         MessageCollectorActor.expectFirstMatching(node1Collector, ElectionTimeout.class);
1221
1222         // Update node2's peer address and send the message again
1223
1224         node1RaftActor.setPeerAddress(node2ID, node2RaftActorRef.path().toString());
1225
1226         node1RaftActorRef.tell(changeServers, testKit.getRef());
1227         reply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), ServerChangeReply.class);
1228         assertEquals("getStatus", ServerChangeStatus.OK, reply.getStatus());
1229
1230         ApplyJournalEntries apply = MessageCollectorActor.expectFirstMatching(node1Collector,
1231                 ApplyJournalEntries.class);
1232         assertEquals("getToIndex", 1, apply.getToIndex());
1233         verifyServerConfigurationPayloadEntry(node1RaftActor.getRaftActorContext().getReplicatedLog(),
1234                 votingServer(node1ID), votingServer(node2ID), nonVotingServer("downNode1"),
1235                 nonVotingServer("downNode2"));
1236         assertEquals("isVotingMember", true, node1RaftActor.getRaftActorContext().isVotingMember());
1237         assertEquals("getRaftState", RaftState.Leader, node1RaftActor.getRaftState());
1238
1239         apply = MessageCollectorActor.expectFirstMatching(node2Collector, ApplyJournalEntries.class);
1240         assertEquals("getToIndex", 1, apply.getToIndex());
1241         verifyServerConfigurationPayloadEntry(node2RaftActor.getRaftActorContext().getReplicatedLog(),
1242                 votingServer(node1ID), votingServer(node2ID), nonVotingServer("downNode1"),
1243                 nonVotingServer("downNode2"));
1244         assertEquals("isVotingMember", true, node2RaftActor.getRaftActorContext().isVotingMember());
1245         assertEquals("getRaftState", RaftState.Follower, node2RaftActor.getRaftState());
1246
1247         LOG.info("testChangeToVotingWithNoLeader ending");
1248     }
1249
1250     @Test
1251     public void testChangeToVotingWithNoLeaderAndElectionTimeout() {
1252         LOG.info("testChangeToVotingWithNoLeaderAndElectionTimeout starting");
1253
1254         final String node1ID = "node1";
1255         final String node2ID = "node2";
1256
1257         final PeerAddressResolver peerAddressResolver = peerId -> peerId.equals(node1ID)
1258                 ? actorFactory.createTestActorPath(node1ID) : peerId.equals(node2ID)
1259                         ? actorFactory.createTestActorPath(node2ID) : null;
1260
1261         ServerConfigurationPayload persistedServerConfig = new ServerConfigurationPayload(Arrays.asList(
1262                 new ServerInfo(node1ID, false), new ServerInfo(node2ID, true)));
1263         SimpleReplicatedLogEntry persistedServerConfigEntry = new SimpleReplicatedLogEntry(0, 1, persistedServerConfig);
1264
1265         InMemoryJournal.addEntry(node1ID, 1, new UpdateElectionTerm(1, "node1"));
1266         InMemoryJournal.addEntry(node1ID, 2, persistedServerConfigEntry);
1267         InMemoryJournal.addEntry(node2ID, 1, new UpdateElectionTerm(1, "node1"));
1268         InMemoryJournal.addEntry(node2ID, 2, persistedServerConfigEntry);
1269
1270         DefaultConfigParamsImpl configParams1 = new DefaultConfigParamsImpl();
1271         configParams1.setHeartBeatInterval(new FiniteDuration(100, TimeUnit.MILLISECONDS));
1272         configParams1.setElectionTimeoutFactor(1);
1273         configParams1.setPeerAddressResolver(peerAddressResolver);
1274         TestActorRef<MessageCollectorActor> node1Collector = actorFactory.createTestActor(
1275                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
1276                 actorFactory.generateActorId("collector"));
1277         TestActorRef<CollectingMockRaftActor> node1RaftActorRef = actorFactory.createTestActor(
1278                 CollectingMockRaftActor.props(node1ID, ImmutableMap.<String, String>of(), configParams1,
1279                         PERSISTENT, node1Collector).withDispatcher(Dispatchers.DefaultDispatcherId()), node1ID);
1280         final CollectingMockRaftActor node1RaftActor = node1RaftActorRef.underlyingActor();
1281
1282         DefaultConfigParamsImpl configParams2 = new DefaultConfigParamsImpl();
1283         configParams2.setElectionTimeoutFactor(1000000);
1284         configParams2.setPeerAddressResolver(peerAddressResolver);
1285         TestActorRef<MessageCollectorActor> node2Collector = actorFactory.createTestActor(
1286                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
1287                 actorFactory.generateActorId("collector"));
1288         TestActorRef<CollectingMockRaftActor> node2RaftActorRef = actorFactory.createTestActor(
1289                 CollectingMockRaftActor.props(node2ID, ImmutableMap.<String, String>of(), configParams2,
1290                         PERSISTENT, node2Collector).withDispatcher(Dispatchers.DefaultDispatcherId()), node2ID);
1291         CollectingMockRaftActor node2RaftActor = node2RaftActorRef.underlyingActor();
1292
1293         // Send a ChangeServersVotingStatus message to node1 to change mode1 to voting. This should cause
1294         // node1 to try to elect itself as leader in order to apply the new server config. But we'll drop
1295         // RequestVote messages in node2 which should cause node1 to time out and revert back to the previous
1296         // server config and fail with NO_LEADER. Note that node1 shouldn't forward the request to node2 b/c
1297         // node2 was previously voting.
1298
1299         node2RaftActor.setDropMessageOfType(RequestVote.class);
1300
1301         ChangeServersVotingStatus changeServers = new ChangeServersVotingStatus(ImmutableMap.of(node1ID, true));
1302         node1RaftActorRef.tell(changeServers, testKit.getRef());
1303         ServerChangeReply reply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), ServerChangeReply.class);
1304         assertEquals("getStatus", ServerChangeStatus.NO_LEADER, reply.getStatus());
1305
1306         assertEquals("Server config", Sets.newHashSet(nonVotingServer(node1ID), votingServer(node2ID)),
1307                 Sets.newHashSet(node1RaftActor.getRaftActorContext().getPeerServerInfo(true).getServerConfig()));
1308         assertEquals("getRaftState", RaftState.Follower, node1RaftActor.getRaftState());
1309
1310         LOG.info("testChangeToVotingWithNoLeaderAndElectionTimeout ending");
1311     }
1312
1313     @Test
1314     public void testChangeToVotingWithNoLeaderAndForwardedToOtherNodeAfterElectionTimeout() {
1315         LOG.info("testChangeToVotingWithNoLeaderAndForwardedToOtherNodeAfterElectionTimeout starting");
1316
1317         final String node1ID = "node1";
1318         final String node2ID = "node2";
1319
1320         final PeerAddressResolver peerAddressResolver = peerId -> peerId.equals(node1ID)
1321                 ? actorFactory.createTestActorPath(node1ID) : peerId.equals(node2ID)
1322                         ? actorFactory.createTestActorPath(node2ID) : null;
1323
1324         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
1325         configParams.setHeartBeatInterval(new FiniteDuration(100, TimeUnit.MILLISECONDS));
1326         configParams.setElectionTimeoutFactor(3);
1327         configParams.setPeerAddressResolver(peerAddressResolver);
1328
1329         ServerConfigurationPayload persistedServerConfig = new ServerConfigurationPayload(Arrays.asList(
1330                 new ServerInfo(node1ID, false), new ServerInfo(node2ID, false)));
1331         SimpleReplicatedLogEntry persistedServerConfigEntry = new SimpleReplicatedLogEntry(0, 1, persistedServerConfig);
1332
1333         InMemoryJournal.addEntry(node1ID, 1, new UpdateElectionTerm(1, "node1"));
1334         InMemoryJournal.addEntry(node1ID, 2, persistedServerConfigEntry);
1335         InMemoryJournal.addEntry(node2ID, 1, new UpdateElectionTerm(1, "node1"));
1336         InMemoryJournal.addEntry(node2ID, 2, persistedServerConfigEntry);
1337         InMemoryJournal.addEntry(node2ID, 3, new SimpleReplicatedLogEntry(1, 1,
1338                 new MockRaftActorContext.MockPayload("2")));
1339         InMemoryJournal.addEntry(node2ID, 4, new ApplyJournalEntries(1));
1340
1341         TestActorRef<MessageCollectorActor> node1Collector = actorFactory.createTestActor(
1342                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
1343                 actorFactory.generateActorId("collector"));
1344         TestActorRef<CollectingMockRaftActor> node1RaftActorRef = actorFactory.createTestActor(
1345                 CollectingMockRaftActor.props(node1ID, ImmutableMap.<String, String>of(), configParams,
1346                         PERSISTENT, node1Collector).withDispatcher(Dispatchers.DefaultDispatcherId()), node1ID);
1347         final CollectingMockRaftActor node1RaftActor = node1RaftActorRef.underlyingActor();
1348
1349         TestActorRef<MessageCollectorActor> node2Collector = actorFactory.createTestActor(
1350                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
1351                 actorFactory.generateActorId("collector"));
1352         TestActorRef<CollectingMockRaftActor> node2RaftActorRef = actorFactory.createTestActor(
1353                 CollectingMockRaftActor.props(node2ID, ImmutableMap.<String, String>of(), configParams,
1354                         PERSISTENT, node2Collector).withDispatcher(Dispatchers.DefaultDispatcherId()), node2ID);
1355         final CollectingMockRaftActor node2RaftActor = node2RaftActorRef.underlyingActor();
1356
1357         // Send a ChangeServersVotingStatus message to node1 to change mode1 to voting. This should cause
1358         // node1 to try to elect itself as leader in order to apply the new server config. However node1's log
1359         // is behind node2's so node2 should not grant node1's vote. This should cause node1 to time out and
1360         // forward the request to node2.
1361
1362         ChangeServersVotingStatus changeServers = new ChangeServersVotingStatus(
1363                 ImmutableMap.of(node1ID, true, node2ID, true));
1364         node1RaftActorRef.tell(changeServers, testKit.getRef());
1365         ServerChangeReply reply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), ServerChangeReply.class);
1366         assertEquals("getStatus", ServerChangeStatus.OK, reply.getStatus());
1367
1368         MessageCollectorActor.expectFirstMatching(node2Collector, ApplyJournalEntries.class);
1369         verifyServerConfigurationPayloadEntry(node2RaftActor.getRaftActorContext().getReplicatedLog(),
1370                 votingServer(node1ID), votingServer(node2ID));
1371         assertEquals("getRaftState", RaftState.Leader, node2RaftActor.getRaftState());
1372
1373         MessageCollectorActor.expectFirstMatching(node1Collector, ApplyJournalEntries.class);
1374         verifyServerConfigurationPayloadEntry(node1RaftActor.getRaftActorContext().getReplicatedLog(),
1375                 votingServer(node1ID), votingServer(node2ID));
1376         assertEquals("isVotingMember", true, node1RaftActor.getRaftActorContext().isVotingMember());
1377         assertEquals("getRaftState", RaftState.Follower, node1RaftActor.getRaftState());
1378
1379         LOG.info("testChangeToVotingWithNoLeaderAndForwardedToOtherNodeAfterElectionTimeout ending");
1380     }
1381
1382     @Test
1383     public void testChangeToVotingWithNoLeaderAndOtherLeaderElected() {
1384         LOG.info("testChangeToVotingWithNoLeaderAndOtherLeaderElected starting");
1385
1386         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
1387         configParams.setHeartBeatInterval(new FiniteDuration(100, TimeUnit.MILLISECONDS));
1388         configParams.setElectionTimeoutFactor(100000);
1389
1390         final String node1ID = "node1";
1391         final String node2ID = "node2";
1392
1393         configParams.setPeerAddressResolver(peerId -> peerId.equals(node1ID)
1394                 ? actorFactory.createTestActorPath(node1ID) : peerId.equals(node2ID)
1395                         ? actorFactory.createTestActorPath(node2ID) : null);
1396
1397         ServerConfigurationPayload persistedServerConfig = new ServerConfigurationPayload(Arrays.asList(
1398                 new ServerInfo(node1ID, false), new ServerInfo(node2ID, true)));
1399         SimpleReplicatedLogEntry persistedServerConfigEntry = new SimpleReplicatedLogEntry(0, 1, persistedServerConfig);
1400
1401         InMemoryJournal.addEntry(node1ID, 1, new UpdateElectionTerm(1, "node1"));
1402         InMemoryJournal.addEntry(node1ID, 2, persistedServerConfigEntry);
1403         InMemoryJournal.addEntry(node2ID, 1, new UpdateElectionTerm(1, "node1"));
1404         InMemoryJournal.addEntry(node2ID, 2, persistedServerConfigEntry);
1405
1406         TestActorRef<MessageCollectorActor> node1Collector = actorFactory.createTestActor(
1407                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
1408                 actorFactory.generateActorId("collector"));
1409         TestActorRef<CollectingMockRaftActor> node1RaftActorRef = actorFactory.createTestActor(
1410                 CollectingMockRaftActor.props(node1ID, ImmutableMap.<String, String>of(), configParams,
1411                         PERSISTENT, node1Collector).withDispatcher(Dispatchers.DefaultDispatcherId()), node1ID);
1412         final CollectingMockRaftActor node1RaftActor = node1RaftActorRef.underlyingActor();
1413
1414         TestActorRef<MessageCollectorActor> node2Collector = actorFactory.createTestActor(
1415                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
1416                 actorFactory.generateActorId("collector"));
1417         TestActorRef<CollectingMockRaftActor> node2RaftActorRef = actorFactory.createTestActor(
1418                 CollectingMockRaftActor.props(node2ID, ImmutableMap.<String, String>of(), configParams,
1419                         PERSISTENT, node2Collector).withDispatcher(Dispatchers.DefaultDispatcherId()), node2ID);
1420         CollectingMockRaftActor node2RaftActor = node2RaftActorRef.underlyingActor();
1421
1422         // Send a ChangeServersVotingStatus message to node1 to change node1 to voting. This should cause
1423         // node1 to try to elect itself as leader in order to apply the new server config. But we'll drop
1424         // RequestVote messages in node2 and make it the leader so node1 should forward the server change
1425         // request to node2 when node2 is elected.
1426
1427         node2RaftActor.setDropMessageOfType(RequestVote.class);
1428
1429         ChangeServersVotingStatus changeServers = new ChangeServersVotingStatus(ImmutableMap.of(node1ID, true,
1430                 node2ID, true));
1431         node1RaftActorRef.tell(changeServers, testKit.getRef());
1432
1433         MessageCollectorActor.expectFirstMatching(node2Collector, RequestVote.class);
1434
1435         node2RaftActorRef.tell(TimeoutNow.INSTANCE, ActorRef.noSender());
1436
1437         ServerChangeReply reply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), ServerChangeReply.class);
1438         assertEquals("getStatus", ServerChangeStatus.OK, reply.getStatus());
1439
1440         MessageCollectorActor.expectFirstMatching(node1Collector, ApplyJournalEntries.class);
1441         verifyServerConfigurationPayloadEntry(node1RaftActor.getRaftActorContext().getReplicatedLog(),
1442                 votingServer(node1ID), votingServer(node2ID));
1443         assertEquals("isVotingMember", true, node1RaftActor.getRaftActorContext().isVotingMember());
1444         assertEquals("getRaftState", RaftState.Follower, node1RaftActor.getRaftState());
1445
1446         MessageCollectorActor.expectFirstMatching(node2Collector, ApplyJournalEntries.class);
1447         verifyServerConfigurationPayloadEntry(node2RaftActor.getRaftActorContext().getReplicatedLog(),
1448                 votingServer(node1ID), votingServer(node2ID));
1449         assertEquals("getRaftState", RaftState.Leader, node2RaftActor.getRaftState());
1450
1451         LOG.info("testChangeToVotingWithNoLeaderAndOtherLeaderElected ending");
1452     }
1453
1454     private static void verifyRaftState(RaftState expState, RaftActor... raftActors) {
1455         Stopwatch sw = Stopwatch.createStarted();
1456         while (sw.elapsed(TimeUnit.SECONDS) <= 5) {
1457             for (RaftActor raftActor : raftActors) {
1458                 if (raftActor.getRaftState() == expState) {
1459                     return;
1460                 }
1461             }
1462         }
1463
1464         fail("None of the RaftActors have state " + expState);
1465     }
1466
1467     private static ServerInfo votingServer(String id) {
1468         return new ServerInfo(id, true);
1469     }
1470
1471     private static ServerInfo nonVotingServer(String id) {
1472         return new ServerInfo(id, false);
1473     }
1474
1475     private TestActorRef<MessageCollectorActor> newLeaderCollectorActor(MockLeaderRaftActor leaderRaftActor) {
1476         return newCollectorActor(leaderRaftActor, LEADER_ID);
1477     }
1478
1479     private TestActorRef<MessageCollectorActor> newCollectorActor(AbstractMockRaftActor raftActor, String id) {
1480         TestActorRef<MessageCollectorActor> collectorActor = actorFactory.createTestActor(
1481                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
1482                 actorFactory.generateActorId(id + "Collector"));
1483         raftActor.setCollectorActor(collectorActor);
1484         return collectorActor;
1485     }
1486
1487     private static void verifyServerConfigurationPayloadEntry(ReplicatedLog log, ServerInfo... expected) {
1488         ReplicatedLogEntry logEntry = log.get(log.lastIndex());
1489         assertEquals("Last log entry payload class", ServerConfigurationPayload.class, logEntry.getData().getClass());
1490         ServerConfigurationPayload payload = (ServerConfigurationPayload)logEntry.getData();
1491         assertEquals("Server config", Sets.newHashSet(expected), Sets.newHashSet(payload.getServerConfig()));
1492     }
1493
1494     private static RaftActorContextImpl newFollowerContext(String id, TestActorRef<? extends UntypedActor> actor) {
1495         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
1496         configParams.setHeartBeatInterval(new FiniteDuration(100, TimeUnit.MILLISECONDS));
1497         configParams.setElectionTimeoutFactor(100000);
1498         NonPersistentDataProvider noPersistence = new NonPersistentDataProvider();
1499         ElectionTermImpl termInfo = new ElectionTermImpl(noPersistence, id, LOG);
1500         termInfo.update(1, LEADER_ID);
1501         return new RaftActorContextImpl(actor, actor.underlyingActor().getContext(),
1502                 id, termInfo, -1, -1, ImmutableMap.of(LEADER_ID, ""), configParams,
1503                 noPersistence, applyState -> actor.tell(applyState, actor), LOG);
1504     }
1505
1506     abstract static class AbstractMockRaftActor extends MockRaftActor {
1507         private volatile TestActorRef<MessageCollectorActor> collectorActor;
1508         private volatile Class<?> dropMessageOfType;
1509
1510         AbstractMockRaftActor(String id, Map<String, String> peerAddresses, Optional<ConfigParams> config,
1511                 boolean persistent, TestActorRef<MessageCollectorActor> collectorActor) {
1512             super(builder().id(id).peerAddresses(peerAddresses).config(config.get())
1513                     .persistent(Optional.of(persistent)));
1514             this.collectorActor = collectorActor;
1515         }
1516
1517         void setDropMessageOfType(Class<?> dropMessageOfType) {
1518             this.dropMessageOfType = dropMessageOfType;
1519         }
1520
1521         void setCollectorActor(TestActorRef<MessageCollectorActor> collectorActor) {
1522             this.collectorActor = collectorActor;
1523         }
1524
1525         @Override
1526         public void handleCommand(Object message) {
1527             if (dropMessageOfType == null || !dropMessageOfType.equals(message.getClass())) {
1528                 super.handleCommand(message);
1529             }
1530
1531             if (collectorActor != null) {
1532                 collectorActor.tell(message, getSender());
1533             }
1534         }
1535     }
1536
1537     public static class CollectingMockRaftActor extends AbstractMockRaftActor {
1538
1539         CollectingMockRaftActor(String id, Map<String, String> peerAddresses, Optional<ConfigParams> config,
1540                 boolean persistent, TestActorRef<MessageCollectorActor> collectorActor) {
1541             super(id, peerAddresses, config, persistent, collectorActor);
1542             snapshotCohortDelegate = new RaftActorSnapshotCohort() {
1543                 @Override
1544                 public void createSnapshot(ActorRef actorRef, java.util.Optional<OutputStream> installSnapshotStream) {
1545                     actorRef.tell(new CaptureSnapshotReply(ByteState.empty(), installSnapshotStream), actorRef);
1546                 }
1547
1548                 @Override
1549                 public void applySnapshot(
1550                         org.opendaylight.controller.cluster.raft.persisted.Snapshot.State snapshotState) {
1551                 }
1552
1553                 @Override
1554                 public org.opendaylight.controller.cluster.raft.persisted.Snapshot.State deserializeSnapshot(
1555                         ByteSource snapshotBytes) {
1556                     throw new UnsupportedOperationException();
1557                 }
1558             };
1559         }
1560
1561         public static Props props(final String id, final Map<String, String> peerAddresses,
1562                 ConfigParams config, boolean persistent, TestActorRef<MessageCollectorActor> collectorActor) {
1563
1564             return Props.create(CollectingMockRaftActor.class, id, peerAddresses, Optional.of(config),
1565                     persistent, collectorActor);
1566         }
1567
1568     }
1569
1570     public static class MockLeaderRaftActor extends AbstractMockRaftActor {
1571         public MockLeaderRaftActor(Map<String, String> peerAddresses, ConfigParams config,
1572                 RaftActorContext fromContext) {
1573             super(LEADER_ID, peerAddresses, Optional.of(config), NO_PERSISTENCE, null);
1574             setPersistence(false);
1575
1576             RaftActorContext context = getRaftActorContext();
1577             for (int i = 0; i < fromContext.getReplicatedLog().size(); i++) {
1578                 ReplicatedLogEntry entry = fromContext.getReplicatedLog().get(i);
1579                 getState().add(entry.getData());
1580                 context.getReplicatedLog().append(entry);
1581             }
1582
1583             context.setCommitIndex(fromContext.getCommitIndex());
1584             context.setLastApplied(fromContext.getLastApplied());
1585             context.getTermInformation().update(fromContext.getTermInformation().getCurrentTerm(),
1586                     fromContext.getTermInformation().getVotedFor());
1587         }
1588
1589         @Override
1590         protected void initializeBehavior() {
1591             changeCurrentBehavior(new Leader(getRaftActorContext()));
1592             initializeBehaviorComplete.countDown();
1593         }
1594
1595         @Override
1596         @SuppressWarnings("checkstyle:IllegalCatch")
1597         public void createSnapshot(ActorRef actorRef, java.util.Optional<OutputStream> installSnapshotStream) {
1598             MockSnapshotState snapshotState = new MockSnapshotState(new ArrayList<>(getState()));
1599             if (installSnapshotStream.isPresent()) {
1600                 SerializationUtils.serialize(snapshotState, installSnapshotStream.get());
1601             }
1602
1603             actorRef.tell(new CaptureSnapshotReply(snapshotState, installSnapshotStream), actorRef);
1604         }
1605
1606         static Props props(Map<String, String> peerAddresses, RaftActorContext fromContext) {
1607             DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
1608             configParams.setHeartBeatInterval(new FiniteDuration(100, TimeUnit.MILLISECONDS));
1609             configParams.setElectionTimeoutFactor(10);
1610             return Props.create(MockLeaderRaftActor.class, peerAddresses, configParams, fromContext);
1611         }
1612     }
1613
1614     public static class MockNewFollowerRaftActor extends AbstractMockRaftActor {
1615         public MockNewFollowerRaftActor(ConfigParams config, TestActorRef<MessageCollectorActor> collectorActor) {
1616             super(NEW_SERVER_ID, Maps.<String, String>newHashMap(), Optional.of(config), NO_PERSISTENCE,
1617                     collectorActor);
1618             setPersistence(false);
1619         }
1620
1621         static Props props(ConfigParams config, TestActorRef<MessageCollectorActor> collectorActor) {
1622             return Props.create(MockNewFollowerRaftActor.class, config, collectorActor);
1623         }
1624     }
1625 }