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 import akka.actor.ActorRef;
  18 import akka.actor.Props;
  19 import akka.actor.UntypedActor;
  20 import akka.dispatch.Dispatchers;
  21 import akka.testkit.JavaTestKit;
  22 import akka.testkit.TestActorRef;
  23 import com.google.common.base.Optional;
  24 import com.google.common.base.Stopwatch;
  25 import com.google.common.collect.ImmutableMap;
  26 import com.google.common.collect.Maps;
  27 import com.google.common.collect.Sets;
  28 import java.util.Arrays;
  29 import java.util.Collections;
  30 import java.util.List;
  31 import java.util.Map;
  32 import java.util.concurrent.TimeUnit;
  33 import org.junit.After;
  34 import org.junit.Before;
  35 import org.junit.Test;
  36 import org.opendaylight.controller.cluster.NonPersistentDataProvider;
  37 import org.opendaylight.controller.cluster.raft.ServerConfigurationPayload.ServerInfo;
  38 import org.opendaylight.controller.cluster.raft.base.messages.ApplyJournalEntries;
  39 import org.opendaylight.controller.cluster.raft.base.messages.ApplySnapshot;
  40 import org.opendaylight.controller.cluster.raft.base.messages.ApplyState;
  41 import org.opendaylight.controller.cluster.raft.base.messages.CaptureSnapshotReply;
  42 import org.opendaylight.controller.cluster.raft.base.messages.ElectionTimeout;
  43 import org.opendaylight.controller.cluster.raft.base.messages.InitiateCaptureSnapshot;
  44 import org.opendaylight.controller.cluster.raft.base.messages.TimeoutNow;
  45 import org.opendaylight.controller.cluster.raft.base.messages.UpdateElectionTerm;
  46 import org.opendaylight.controller.cluster.raft.behaviors.AbstractLeader;
  47 import org.opendaylight.controller.cluster.raft.behaviors.Follower;
  48 import org.opendaylight.controller.cluster.raft.behaviors.Leader;
  49 import org.opendaylight.controller.cluster.raft.behaviors.RaftActorBehavior;
  50 import org.opendaylight.controller.cluster.raft.messages.AddServer;
  51 import org.opendaylight.controller.cluster.raft.messages.AddServerReply;
  52 import org.opendaylight.controller.cluster.raft.messages.AppendEntries;
  53 import org.opendaylight.controller.cluster.raft.messages.ChangeServersVotingStatus;
  54 import org.opendaylight.controller.cluster.raft.messages.InstallSnapshot;
  55 import org.opendaylight.controller.cluster.raft.messages.RemoveServer;
  56 import org.opendaylight.controller.cluster.raft.messages.RemoveServerReply;
  57 import org.opendaylight.controller.cluster.raft.messages.RequestVote;
  58 import org.opendaylight.controller.cluster.raft.messages.ServerChangeReply;
  59 import org.opendaylight.controller.cluster.raft.messages.ServerChangeStatus;
  60 import org.opendaylight.controller.cluster.raft.messages.ServerRemoved;
  61 import org.opendaylight.controller.cluster.raft.messages.UnInitializedFollowerSnapshotReply;
  62 import org.opendaylight.controller.cluster.raft.policy.DisableElectionsRaftPolicy;
  63 import org.opendaylight.controller.cluster.raft.utils.ForwardMessageToBehaviorActor;
  64 import org.opendaylight.controller.cluster.raft.utils.InMemoryJournal;
  65 import org.opendaylight.controller.cluster.raft.utils.InMemorySnapshotStore;
  66 import org.opendaylight.controller.cluster.raft.utils.MessageCollectorActor;
  67 import org.slf4j.Logger;
  68 import org.slf4j.LoggerFactory;
  69 import scala.concurrent.duration.FiniteDuration;
  70
  71 /**
  72  * Unit tests for RaftActorServerConfigurationSupport.
  73  *
  74  * @author Thomas Pantelis
  75  */
  76 public class RaftActorServerConfigurationSupportTest extends AbstractActorTest {
  77     static final String LEADER_ID = "leader";
  78     static final String FOLLOWER_ID = "follower";
  79     static final String FOLLOWER_ID2 = "follower2";
  80     static final String NEW_SERVER_ID = "new-server";
  81     static final String NEW_SERVER_ID2 = "new-server2";
  82     private static final Logger LOG = LoggerFactory.getLogger(RaftActorServerConfigurationSupportTest.class);
  83     private static final Class<?> COMMIT_MESSAGE_CLASS = RaftActorSnapshotMessageSupport.COMMIT_SNAPSHOT.getClass();
  84     private static final boolean NO_PERSISTENCE = false;
  85     private static final boolean PERSISTENT = true;
  86
  87     private final TestActorFactory actorFactory = new TestActorFactory(getSystem());
  88
  89     private final TestActorRef<ForwardMessageToBehaviorActor> followerActor = actorFactory.createTestActor(
  90             Props.create(ForwardMessageToBehaviorActor.class).withDispatcher(Dispatchers.DefaultDispatcherId()),
  91             actorFactory.generateActorId(FOLLOWER_ID));
  92
  93     private TestActorRef<MockNewFollowerRaftActor> newFollowerRaftActor;
  94     private TestActorRef<MessageCollectorActor> newFollowerCollectorActor;
  95     private RaftActorContext newFollowerActorContext;
  96
  97     private final JavaTestKit testKit = new JavaTestKit(getSystem());
  98
  99     @Before
 100     public void setup() {
 101         InMemoryJournal.clear();
 102         InMemorySnapshotStore.clear();
 103     }
 104
 105     private void setupNewFollower() {
 106         DefaultConfigParamsImpl configParams = newFollowerConfigParams();
 107
 108         newFollowerCollectorActor = actorFactory.createTestActor(
 109                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
 110                 actorFactory.generateActorId(NEW_SERVER_ID + "Collector"));
 111         newFollowerRaftActor = actorFactory.createTestActor(MockNewFollowerRaftActor.props(
 112                 configParams, newFollowerCollectorActor).withDispatcher(Dispatchers.DefaultDispatcherId()),
 113                 actorFactory.generateActorId(NEW_SERVER_ID));
 114
 115         try {
 116             newFollowerActorContext = newFollowerRaftActor.underlyingActor().getRaftActorContext();
 117         } catch (Exception e) {
 118             newFollowerActorContext = newFollowerRaftActor.underlyingActor().getRaftActorContext();
 119         }
 120     }
 121
 122     private static DefaultConfigParamsImpl newFollowerConfigParams() {
 123         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
 124         configParams.setHeartBeatInterval(new FiniteDuration(100, TimeUnit.MILLISECONDS));
 125         configParams.setElectionTimeoutFactor(100000);
 126         configParams.setCustomRaftPolicyImplementationClass(DisableElectionsRaftPolicy.class.getName());
 127         return configParams;
 128     }
 129
 130     @After
 131     public void tearDown() throws Exception {
 132         actorFactory.close();
 133     }
 134
 135     @Test
 136     public void testAddServerWithExistingFollower() throws Exception {
 137         LOG.info("testAddServerWithExistingFollower starting");
 138         setupNewFollower();
 139         RaftActorContextImpl followerActorContext = newFollowerContext(FOLLOWER_ID, followerActor);
 140         followerActorContext.setReplicatedLog(new MockRaftActorContext.MockReplicatedLogBuilder().createEntries(
 141                 0, 3, 1).build());
 142         followerActorContext.setCommitIndex(2);
 143         followerActorContext.setLastApplied(2);
 144
 145         Follower follower = new Follower(followerActorContext);
 146         followerActor.underlyingActor().setBehavior(follower);
 147         followerActorContext.setCurrentBehavior(follower);
 148
 149         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 150                 MockLeaderRaftActor.props(ImmutableMap.of(FOLLOWER_ID, followerActor.path().toString()),
 151                         followerActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 152                 actorFactory.generateActorId(LEADER_ID));
 153
 154         // Expect initial heartbeat from the leader.
 155         expectFirstMatching(followerActor, AppendEntries.class);
 156         clearMessages(followerActor);
 157
 158         MockLeaderRaftActor leaderRaftActor = leaderActor.underlyingActor();
 159         TestActorRef<MessageCollectorActor> leaderCollectorActor = newLeaderCollectorActor(leaderRaftActor);
 160
 161         leaderActor.tell(new AddServer(NEW_SERVER_ID, newFollowerRaftActor.path().toString(), true), testKit.getRef());
 162
 163         // Leader should install snapshot - capture and verify ApplySnapshot contents
 164
 165         ApplySnapshot applySnapshot = expectFirstMatching(newFollowerCollectorActor, ApplySnapshot.class);
 166         @SuppressWarnings("unchecked")
 167         List<Object> snapshotState = (List<Object>) MockRaftActor.toObject(applySnapshot.getSnapshot().getState());
 168         assertEquals("Snapshot state", snapshotState, leaderRaftActor.getState());
 169
 170         AddServerReply addServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 171         assertEquals("getStatus", ServerChangeStatus.OK, addServerReply.getStatus());
 172         assertEquals("getLeaderHint", LEADER_ID, addServerReply.getLeaderHint().get());
 173
 174         // Verify ServerConfigurationPayload entry in leader's log
 175
 176         expectFirstMatching(leaderCollectorActor, ApplyState.class);
 177         RaftActorContext leaderActorContext = leaderRaftActor.getRaftActorContext();
 178         assertEquals("Leader journal last index", 3, leaderActorContext.getReplicatedLog().lastIndex());
 179         assertEquals("Leader commit index", 3, leaderActorContext.getCommitIndex());
 180         assertEquals("Leader last applied index", 3, leaderActorContext.getLastApplied());
 181         verifyServerConfigurationPayloadEntry(leaderActorContext.getReplicatedLog(), votingServer(LEADER_ID),
 182                 votingServer(FOLLOWER_ID), votingServer(NEW_SERVER_ID));
 183
 184         // Verify ServerConfigurationPayload entry in both followers
 185
 186         expectFirstMatching(followerActor, ApplyState.class);
 187         assertEquals("Follower journal last index", 3, followerActorContext.getReplicatedLog().lastIndex());
 188         verifyServerConfigurationPayloadEntry(followerActorContext.getReplicatedLog(), votingServer(LEADER_ID),
 189                 votingServer(FOLLOWER_ID), votingServer(NEW_SERVER_ID));
 190
 191         expectFirstMatching(newFollowerCollectorActor, ApplyState.class);
 192         assertEquals("New follower journal last index", 3, newFollowerActorContext.getReplicatedLog().lastIndex());
 193         verifyServerConfigurationPayloadEntry(newFollowerActorContext.getReplicatedLog(), votingServer(LEADER_ID),
 194                 votingServer(FOLLOWER_ID), votingServer(NEW_SERVER_ID));
 195
 196         // Verify new server config was applied in both followers
 197
 198         assertEquals("Follower peers", Sets.newHashSet(LEADER_ID, NEW_SERVER_ID), followerActorContext.getPeerIds());
 199
 200         assertEquals("New follower peers", Sets.newHashSet(LEADER_ID, FOLLOWER_ID), newFollowerActorContext.getPeerIds());
 201
 202         expectFirstMatching(newFollowerCollectorActor, ApplyState.class);
 203         expectFirstMatching(followerActor, ApplyState.class);
 204
 205         assertEquals("Follower commit index", 3, followerActorContext.getCommitIndex());
 206         assertEquals("Follower last applied index", 3, followerActorContext.getLastApplied());
 207         assertEquals("New follower commit index", 3, newFollowerActorContext.getCommitIndex());
 208         assertEquals("New follower last applied index", 3, newFollowerActorContext.getLastApplied());
 209
 210         List<ReplicatedLogImplEntry> persistedLogEntries = InMemoryJournal.get(LEADER_ID, ReplicatedLogImplEntry.class);
 211         assertEquals("Leader ReplicatedLogImplEntry entries", 1, persistedLogEntries.size());
 212         ReplicatedLogImplEntry logEntry = persistedLogEntries.get(0);
 213         assertEquals("Leader ReplicatedLogImplEntry getTerm", 1, logEntry.getTerm());
 214         assertEquals("Leader ReplicatedLogImplEntry getIndex", 3, logEntry.getIndex());
 215         assertEquals("Leader ReplicatedLogImplEntry getData", ServerConfigurationPayload.class, logEntry.getData().getClass());
 216
 217         persistedLogEntries = InMemoryJournal.get(NEW_SERVER_ID, ReplicatedLogImplEntry.class);
 218         assertEquals("New follower ReplicatedLogImplEntry entries", 1, persistedLogEntries.size());
 219         logEntry = persistedLogEntries.get(0);
 220         assertEquals("New follower ReplicatedLogImplEntry getTerm", 1, logEntry.getTerm());
 221         assertEquals("New follower ReplicatedLogImplEntry getIndex", 3, logEntry.getIndex());
 222         assertEquals("New follower ReplicatedLogImplEntry getData", ServerConfigurationPayload.class,
 223                 logEntry.getData().getClass());
 224
 225         LOG.info("testAddServerWithExistingFollower ending");
 226     }
 227
 228     @Test
 229     public void testAddServerWithNoExistingFollower() throws Exception {
 230         LOG.info("testAddServerWithNoExistingFollower starting");
 231
 232         setupNewFollower();
 233         RaftActorContext initialActorContext = new MockRaftActorContext();
 234         initialActorContext.setCommitIndex(1);
 235         initialActorContext.setLastApplied(1);
 236         initialActorContext.setReplicatedLog(new MockRaftActorContext.MockReplicatedLogBuilder().createEntries(
 237                 0, 2, 1).build());
 238
 239         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 240                 MockLeaderRaftActor.props(ImmutableMap.<String, String>of(),
 241                         initialActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 242                 actorFactory.generateActorId(LEADER_ID));
 243
 244         MockLeaderRaftActor leaderRaftActor = leaderActor.underlyingActor();
 245         RaftActorContext leaderActorContext = leaderRaftActor.getRaftActorContext();
 246
 247         TestActorRef<MessageCollectorActor> leaderCollectorActor = newLeaderCollectorActor(leaderRaftActor);
 248
 249         leaderActor.tell(new AddServer(NEW_SERVER_ID, newFollowerRaftActor.path().toString(), true), testKit.getRef());
 250
 251         // Leader should install snapshot - capture and verify ApplySnapshot contents
 252
 253         ApplySnapshot applySnapshot = expectFirstMatching(newFollowerCollectorActor, ApplySnapshot.class);
 254         @SuppressWarnings("unchecked")
 255         List<Object> snapshotState = (List<Object>) MockRaftActor.toObject(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         RaftActorContext leaderActorContext = leaderRaftActor.getRaftActorContext();
 299
 300         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         RaftActorContext leaderActorContext = leaderRaftActor.getRaftActorContext();
 369
 370         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.SERIALIZABLE_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         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         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         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.SERIALIZABLE_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), testKit.getRef());
 640         AddServerReply addServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 641         assertEquals("getStatus", ServerChangeStatus.NO_LEADER, addServerReply.getStatus());
 642
 643         LOG.info("testAddServerWithNoLeader ending");
 644     }
 645
 646     @Test
 647     public void testAddServerWithNoConsensusReached() {
 648         LOG.info("testAddServerWithNoConsensusReached starting");
 649
 650         setupNewFollower();
 651         RaftActorContext initialActorContext = new MockRaftActorContext();
 652
 653         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 654                 MockLeaderRaftActor.props(ImmutableMap.<String, String>of(),
 655                         initialActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 656                 actorFactory.generateActorId(LEADER_ID));
 657
 658         MockLeaderRaftActor leaderRaftActor = leaderActor.underlyingActor();
 659         RaftActorContext leaderActorContext = leaderRaftActor.getRaftActorContext();
 660
 661         TestActorRef<MessageCollectorActor> leaderCollectorActor = newLeaderCollectorActor(leaderRaftActor);
 662
 663         // Drop UnInitializedFollowerSnapshotReply initially
 664         leaderRaftActor.setDropMessageOfType(UnInitializedFollowerSnapshotReply.class);
 665
 666         MockNewFollowerRaftActor newFollowerRaftActorInstance = newFollowerRaftActor.underlyingActor();
 667         TestActorRef<MessageCollectorActor> newFollowerCollectorActor =
 668                 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), testKit.getRef());
 750         expectFirstMatching(leaderActor, AddServer.class);
 751
 752         LOG.info("testAddServerForwardedToLeader ending");
 753     }
 754
 755     @Test
 756     public void testOnApplyState() {
 757         LOG.info("testOnApplyState starting");
 758
 759         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
 760         configParams.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 761         TestActorRef<MockRaftActor> noLeaderActor = actorFactory.createTestActor(
 762                 MockRaftActor.builder().id(LEADER_ID).peerAddresses(ImmutableMap.of(FOLLOWER_ID,
 763                         followerActor.path().toString())).config(configParams).persistent(Optional.of(false)).
 764                         props().withDispatcher(Dispatchers.DefaultDispatcherId()),
 765                 actorFactory.generateActorId(LEADER_ID));
 766
 767         RaftActorServerConfigurationSupport support = new RaftActorServerConfigurationSupport(noLeaderActor.underlyingActor());
 768
 769         ReplicatedLogEntry serverConfigEntry = new MockRaftActorContext.MockReplicatedLogEntry(1, 1,
 770                 new ServerConfigurationPayload(Collections.<ServerInfo>emptyList()));
 771         boolean handled = support.handleMessage(new ApplyState(null, null, serverConfigEntry), ActorRef.noSender());
 772         assertEquals("Message handled", true, handled);
 773
 774         ReplicatedLogEntry nonServerConfigEntry = new MockRaftActorContext.MockReplicatedLogEntry(1, 1,
 775                 new MockRaftActorContext.MockPayload("1"));
 776         handled = support.handleMessage(new ApplyState(null, null, nonServerConfigEntry), ActorRef.noSender());
 777         assertEquals("Message handled", false, handled);
 778
 779         LOG.info("testOnApplyState ending");
 780     }
 781
 782     @Test
 783     public void testRemoveServerWithNoLeader() {
 784         LOG.info("testRemoveServerWithNoLeader starting");
 785
 786         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
 787         configParams.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 788
 789         TestActorRef<MockRaftActor> leaderActor = actorFactory.createTestActor(
 790                 MockRaftActor.builder().id(LEADER_ID).peerAddresses(ImmutableMap.of(FOLLOWER_ID,
 791                         followerActor.path().toString())).config(configParams).persistent(Optional.of(false)).
 792                         props().withDispatcher(Dispatchers.DefaultDispatcherId()),
 793                 actorFactory.generateActorId(LEADER_ID));
 794         leaderActor.underlyingActor().waitForInitializeBehaviorComplete();
 795
 796         leaderActor.tell(new RemoveServer(FOLLOWER_ID), testKit.getRef());
 797         RemoveServerReply removeServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), RemoveServerReply.class);
 798         assertEquals("getStatus", ServerChangeStatus.NO_LEADER, removeServerReply.getStatus());
 799
 800         LOG.info("testRemoveServerWithNoLeader ending");
 801     }
 802
 803     @Test
 804     public void testRemoveServerNonExistentServer() {
 805         LOG.info("testRemoveServerNonExistentServer starting");
 806
 807         RaftActorContext initialActorContext = new MockRaftActorContext();
 808
 809         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 810                 MockLeaderRaftActor.props(ImmutableMap.of(FOLLOWER_ID, followerActor.path().toString()),
 811                         initialActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 812                 actorFactory.generateActorId(LEADER_ID));
 813
 814         leaderActor.tell(new RemoveServer(NEW_SERVER_ID), testKit.getRef());
 815         RemoveServerReply removeServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), RemoveServerReply.class);
 816         assertEquals("getStatus", ServerChangeStatus.DOES_NOT_EXIST, removeServerReply.getStatus());
 817
 818         LOG.info("testRemoveServerNonExistentServer ending");
 819     }
 820
 821     @Test
 822     public void testRemoveServerForwardToLeader() {
 823         LOG.info("testRemoveServerForwardToLeader starting");
 824
 825         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
 826         configParams.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 827
 828         TestActorRef<MessageCollectorActor> leaderActor = actorFactory.createTestActor(
 829                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
 830                 actorFactory.generateActorId(LEADER_ID));
 831
 832         TestActorRef<MockRaftActor> followerRaftActor = actorFactory.createTestActor(
 833                 MockRaftActor.builder().id(FOLLOWER_ID).peerAddresses(ImmutableMap.of(LEADER_ID,
 834                         leaderActor.path().toString())).config(configParams).persistent(Optional.of(false)).
 835                         props().withDispatcher(Dispatchers.DefaultDispatcherId()),
 836                 actorFactory.generateActorId(FOLLOWER_ID));
 837         followerRaftActor.underlyingActor().waitForInitializeBehaviorComplete();
 838
 839         followerRaftActor.tell(new AppendEntries(1, LEADER_ID, 0, 1, Collections.<ReplicatedLogEntry>emptyList(),
 840                 -1, -1, (short)0), leaderActor);
 841
 842         followerRaftActor.tell(new RemoveServer(FOLLOWER_ID), testKit.getRef());
 843         expectFirstMatching(leaderActor, RemoveServer.class);
 844
 845         LOG.info("testRemoveServerForwardToLeader ending");
 846     }
 847
 848     @Test
 849     public void testRemoveServer() {
 850         LOG.info("testRemoveServer starting");
 851
 852         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
 853         configParams.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 854         configParams.setCustomRaftPolicyImplementationClass(DisableElectionsRaftPolicy.class.getName());
 855
 856         final String followerActorId = actorFactory.generateActorId(FOLLOWER_ID);
 857         final String followerActorPath = actorFactory.createTestActorPath(followerActorId);
 858         RaftActorContext initialActorContext = new MockRaftActorContext();
 859
 860         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 861                 MockLeaderRaftActor.props(ImmutableMap.of(FOLLOWER_ID, followerActorPath),
 862                         initialActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 863                 actorFactory.generateActorId(LEADER_ID));
 864
 865         TestActorRef<MessageCollectorActor> leaderCollector = newLeaderCollectorActor(leaderActor.underlyingActor());
 866
 867         TestActorRef<MessageCollectorActor> collector =
 868                 actorFactory.createTestActor(MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
 869                         actorFactory.generateActorId("collector"));
 870         TestActorRef<CollectingMockRaftActor> followerRaftActor = actorFactory.createTestActor(
 871                 CollectingMockRaftActor.props(FOLLOWER_ID, ImmutableMap.of(LEADER_ID, leaderActor.path().toString()),
 872                         configParams, NO_PERSISTENCE, collector).withDispatcher(Dispatchers.DefaultDispatcherId()),
 873                 followerActorId);
 874
 875         leaderActor.tell(new RemoveServer(FOLLOWER_ID), testKit.getRef());
 876         RemoveServerReply removeServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), RemoveServerReply.class);
 877         assertEquals("getStatus", ServerChangeStatus.OK, removeServerReply.getStatus());
 878
 879         final ApplyState applyState = MessageCollectorActor.expectFirstMatching(leaderCollector, ApplyState.class);
 880         assertEquals(0L, applyState.getReplicatedLogEntry().getIndex());
 881         verifyServerConfigurationPayloadEntry(leaderActor.underlyingActor().getRaftActorContext().getReplicatedLog(), votingServer(LEADER_ID));
 882
 883         RaftActorBehavior currentBehavior = leaderActor.underlyingActor().getCurrentBehavior();
 884         assertTrue("Expected Leader", currentBehavior instanceof Leader);
 885         assertEquals("Follower ids size", 0, ((Leader)currentBehavior).getFollowerIds().size());
 886
 887         MessageCollectorActor.expectFirstMatching(collector, ServerRemoved.class);
 888
 889         LOG.info("testRemoveServer ending");
 890     }
 891
 892     @Test
 893     public void testRemoveServerLeader() {
 894         LOG.info("testRemoveServerLeader starting");
 895
 896         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
 897         configParams.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 898         configParams.setCustomRaftPolicyImplementationClass(DisableElectionsRaftPolicy.class.getName());
 899
 900         final String followerActorId = actorFactory.generateActorId(FOLLOWER_ID);
 901         final String followerActorPath = actorFactory.createTestActorPath(followerActorId);
 902         RaftActorContext initialActorContext = new MockRaftActorContext();
 903
 904         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 905                 MockLeaderRaftActor.props(ImmutableMap.of(FOLLOWER_ID, followerActorPath),
 906                         initialActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 907                 actorFactory.generateActorId(LEADER_ID));
 908
 909         TestActorRef<MessageCollectorActor> leaderCollector = newLeaderCollectorActor(leaderActor.underlyingActor());
 910
 911         TestActorRef<MessageCollectorActor> followerCollector = actorFactory.createTestActor(MessageCollectorActor.props().
 912                 withDispatcher(Dispatchers.DefaultDispatcherId()), actorFactory.generateActorId("collector"));
 913         actorFactory.createTestActor(
 914                 CollectingMockRaftActor.props(FOLLOWER_ID, ImmutableMap.of(LEADER_ID, leaderActor.path().toString()),
 915                         configParams, NO_PERSISTENCE, followerCollector).withDispatcher(Dispatchers.DefaultDispatcherId()),
 916                 followerActorId);
 917
 918         leaderActor.tell(new RemoveServer(LEADER_ID), testKit.getRef());
 919         RemoveServerReply removeServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), RemoveServerReply.class);
 920         assertEquals("getStatus", ServerChangeStatus.OK, removeServerReply.getStatus());
 921
 922         final ApplyState applyState = MessageCollectorActor.expectFirstMatching(followerCollector, ApplyState.class);
 923         assertEquals(0L, applyState.getReplicatedLogEntry().getIndex());
 924         verifyServerConfigurationPayloadEntry(leaderActor.underlyingActor().getRaftActorContext().getReplicatedLog(),
 925                 votingServer(FOLLOWER_ID));
 926
 927         MessageCollectorActor.expectFirstMatching(leaderCollector, ServerRemoved.class);
 928
 929         LOG.info("testRemoveServerLeader ending");
 930     }
 931
 932     @Test
 933     public void testRemoveServerLeaderWithNoFollowers() {
 934         LOG.info("testRemoveServerLeaderWithNoFollowers starting");
 935
 936         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 937                 MockLeaderRaftActor.props(Collections.<String, String>emptyMap(),
 938                         new MockRaftActorContext()).withDispatcher(Dispatchers.DefaultDispatcherId()),
 939                 actorFactory.generateActorId(LEADER_ID));
 940
 941         leaderActor.tell(new RemoveServer(LEADER_ID), testKit.getRef());
 942         RemoveServerReply removeServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), RemoveServerReply.class);
 943         assertEquals("getStatus", ServerChangeStatus.NOT_SUPPORTED, removeServerReply.getStatus());
 944
 945         LOG.info("testRemoveServerLeaderWithNoFollowers ending");
 946     }
 947
 948     @Test
 949     public void testChangeServersVotingStatus() {
 950         LOG.info("testChangeServersVotingStatus starting");
 951
 952         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
 953         configParams.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 954         configParams.setCustomRaftPolicyImplementationClass(DisableElectionsRaftPolicy.class.getName());
 955
 956         final String follower1ActorId = actorFactory.generateActorId(FOLLOWER_ID);
 957         final String follower1ActorPath = actorFactory.createTestActorPath(follower1ActorId);
 958         final String follower2ActorId = actorFactory.generateActorId(FOLLOWER_ID2);
 959         final String follower2ActorPath = actorFactory.createTestActorPath(follower2ActorId);
 960
 961         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 962                 MockLeaderRaftActor.props(ImmutableMap.of(FOLLOWER_ID, follower1ActorPath,
 963                         FOLLOWER_ID2, follower2ActorPath), new MockRaftActorContext()).
 964                         withDispatcher(Dispatchers.DefaultDispatcherId()), actorFactory.generateActorId(LEADER_ID));
 965         TestActorRef<MessageCollectorActor> leaderCollector = newLeaderCollectorActor(leaderActor.underlyingActor());
 966
 967         TestActorRef<MessageCollectorActor> follower1Collector = actorFactory.createTestActor(
 968                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
 969                 actorFactory.generateActorId("collector"));
 970         TestActorRef<CollectingMockRaftActor> follower1RaftActor = actorFactory.createTestActor(
 971                 CollectingMockRaftActor.props(FOLLOWER_ID, ImmutableMap.of(LEADER_ID, leaderActor.path().toString(),
 972                         FOLLOWER_ID2, follower2ActorPath), configParams, NO_PERSISTENCE, follower1Collector).
 973                         withDispatcher(Dispatchers.DefaultDispatcherId()), follower1ActorId);
 974
 975         TestActorRef<MessageCollectorActor> follower2Collector = actorFactory.createTestActor(
 976                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
 977                 actorFactory.generateActorId("collector"));
 978         TestActorRef<CollectingMockRaftActor> follower2RaftActor = actorFactory.createTestActor(
 979                 CollectingMockRaftActor.props(FOLLOWER_ID2, ImmutableMap.of(LEADER_ID, leaderActor.path().toString(),
 980                         FOLLOWER_ID, follower1ActorPath), configParams, NO_PERSISTENCE, follower2Collector).
 981                         withDispatcher(Dispatchers.DefaultDispatcherId()), follower2ActorId);
 982
 983         // Send first ChangeServersVotingStatus message
 984
 985         leaderActor.tell(new ChangeServersVotingStatus(ImmutableMap.of(FOLLOWER_ID, false, FOLLOWER_ID2, false)),
 986                 testKit.getRef());
 987         ServerChangeReply reply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), ServerChangeReply.class);
 988         assertEquals("getStatus", ServerChangeStatus.OK, reply.getStatus());
 989
 990         final ApplyState applyState = MessageCollectorActor.expectFirstMatching(leaderCollector, ApplyState.class);
 991         assertEquals(0L, applyState.getReplicatedLogEntry().getIndex());
 992         verifyServerConfigurationPayloadEntry(leaderActor.underlyingActor().getRaftActorContext().getReplicatedLog(),
 993                 votingServer(LEADER_ID), nonVotingServer(FOLLOWER_ID), nonVotingServer(FOLLOWER_ID2));
 994
 995         MessageCollectorActor.expectFirstMatching(follower1Collector, ApplyState.class);
 996         verifyServerConfigurationPayloadEntry(follower1RaftActor.underlyingActor().getRaftActorContext().getReplicatedLog(),
 997                 votingServer(LEADER_ID), nonVotingServer(FOLLOWER_ID), nonVotingServer(FOLLOWER_ID2));
 998
 999         MessageCollectorActor.expectFirstMatching(follower2Collector, ApplyState.class);
1000         verifyServerConfigurationPayloadEntry(follower2RaftActor.underlyingActor().getRaftActorContext().getReplicatedLog(),
1001                 votingServer(LEADER_ID), nonVotingServer(FOLLOWER_ID), nonVotingServer(FOLLOWER_ID2));
1002
1003         MessageCollectorActor.clearMessages(leaderCollector);
1004         MessageCollectorActor.clearMessages(follower1Collector);
1005         MessageCollectorActor.clearMessages(follower2Collector);
1006
1007         // Send second ChangeServersVotingStatus message
1008
1009         leaderActor.tell(new ChangeServersVotingStatus(ImmutableMap.of(FOLLOWER_ID, true)), testKit.getRef());
1010         reply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), ServerChangeReply.class);
1011         assertEquals("getStatus", ServerChangeStatus.OK, reply.getStatus());
1012
1013         MessageCollectorActor.expectFirstMatching(leaderCollector, ApplyState.class);
1014         verifyServerConfigurationPayloadEntry(leaderActor.underlyingActor().getRaftActorContext().getReplicatedLog(),
1015                 votingServer(LEADER_ID), votingServer(FOLLOWER_ID), nonVotingServer(FOLLOWER_ID2));
1016
1017         MessageCollectorActor.expectFirstMatching(follower1Collector, ApplyState.class);
1018         verifyServerConfigurationPayloadEntry(follower1RaftActor.underlyingActor().getRaftActorContext().getReplicatedLog(),
1019                 votingServer(LEADER_ID), votingServer(FOLLOWER_ID), nonVotingServer(FOLLOWER_ID2));
1020
1021         MessageCollectorActor.expectFirstMatching(follower2Collector, ApplyState.class);
1022         verifyServerConfigurationPayloadEntry(follower2RaftActor.underlyingActor().getRaftActorContext().getReplicatedLog(),
1023                 votingServer(LEADER_ID), votingServer(FOLLOWER_ID), nonVotingServer(FOLLOWER_ID2));
1024
1025         LOG.info("testChangeServersVotingStatus ending");
1026     }
1027
1028     @Test
1029     public void testChangeLeaderToNonVoting() {
1030         LOG.info("testChangeLeaderToNonVoting starting");
1031
1032         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
1033         configParams.setHeartBeatInterval(new FiniteDuration(500, TimeUnit.MILLISECONDS));
1034
1035         final String follower1ActorId = actorFactory.generateActorId(FOLLOWER_ID);
1036         final String follower1ActorPath = actorFactory.createTestActorPath(follower1ActorId);
1037         final String follower2ActorId = actorFactory.generateActorId(FOLLOWER_ID2);
1038         final String follower2ActorPath = actorFactory.createTestActorPath(follower2ActorId);
1039
1040         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
1041                 MockLeaderRaftActor.props(ImmutableMap.of(FOLLOWER_ID, follower1ActorPath,
1042                         FOLLOWER_ID2, follower2ActorPath), new MockRaftActorContext()).
1043                         withDispatcher(Dispatchers.DefaultDispatcherId()), actorFactory.generateActorId(LEADER_ID));
1044         TestActorRef<MessageCollectorActor> leaderCollector = newLeaderCollectorActor(leaderActor.underlyingActor());
1045
1046         TestActorRef<MessageCollectorActor> follower1Collector = actorFactory.createTestActor(
1047                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
1048                 actorFactory.generateActorId("collector"));
1049         TestActorRef<CollectingMockRaftActor> follower1RaftActor = actorFactory.createTestActor(
1050                 CollectingMockRaftActor.props(FOLLOWER_ID, ImmutableMap.of(LEADER_ID, leaderActor.path().toString(),
1051                         FOLLOWER_ID2, follower2ActorPath), configParams, NO_PERSISTENCE, follower1Collector).
1052                         withDispatcher(Dispatchers.DefaultDispatcherId()), follower1ActorId);
1053
1054         TestActorRef<MessageCollectorActor> follower2Collector = actorFactory.createTestActor(
1055                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
1056                 actorFactory.generateActorId("collector"));
1057         TestActorRef<CollectingMockRaftActor> follower2RaftActor = actorFactory.createTestActor(
1058                 CollectingMockRaftActor.props(FOLLOWER_ID2, ImmutableMap.of(LEADER_ID, leaderActor.path().toString(),
1059                         FOLLOWER_ID, follower1ActorPath), configParams, NO_PERSISTENCE, follower2Collector).
1060                         withDispatcher(Dispatchers.DefaultDispatcherId()), follower2ActorId);
1061
1062         // Send ChangeServersVotingStatus message
1063
1064         leaderActor.tell(new ChangeServersVotingStatus(ImmutableMap.of(LEADER_ID, false)), testKit.getRef());
1065         ServerChangeReply reply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), ServerChangeReply.class);
1066         assertEquals("getStatus", ServerChangeStatus.OK, reply.getStatus());
1067
1068         MessageCollectorActor.expectFirstMatching(leaderCollector, ApplyState.class);
1069         verifyServerConfigurationPayloadEntry(leaderActor.underlyingActor().getRaftActorContext().getReplicatedLog(),
1070                 nonVotingServer(LEADER_ID), votingServer(FOLLOWER_ID), votingServer(FOLLOWER_ID2));
1071
1072         MessageCollectorActor.expectFirstMatching(follower1Collector, ApplyState.class);
1073         verifyServerConfigurationPayloadEntry(follower1RaftActor.underlyingActor().getRaftActorContext().getReplicatedLog(),
1074                 nonVotingServer(LEADER_ID), votingServer(FOLLOWER_ID), votingServer(FOLLOWER_ID2));
1075
1076         MessageCollectorActor.expectFirstMatching(follower2Collector, ApplyState.class);
1077         verifyServerConfigurationPayloadEntry(follower2RaftActor.underlyingActor().getRaftActorContext().getReplicatedLog(),
1078                 nonVotingServer(LEADER_ID), votingServer(FOLLOWER_ID), votingServer(FOLLOWER_ID2));
1079
1080         verifyRaftState(RaftState.Leader, follower1RaftActor.underlyingActor(), follower2RaftActor.underlyingActor());
1081         verifyRaftState(RaftState.Follower, leaderActor.underlyingActor());
1082
1083         MessageCollectorActor.expectMatching(leaderCollector, AppendEntries.class, 2);
1084
1085         LOG.info("testChangeLeaderToNonVoting ending");
1086     }
1087
1088     @Test
1089     public void testChangeLeaderToNonVotingInSingleNode() {
1090         LOG.info("testChangeLeaderToNonVotingInSingleNode starting");
1091
1092         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
1093                 MockLeaderRaftActor.props(ImmutableMap.of(), new MockRaftActorContext()).
1094                         withDispatcher(Dispatchers.DefaultDispatcherId()), actorFactory.generateActorId(LEADER_ID));
1095
1096         leaderActor.tell(new ChangeServersVotingStatus(ImmutableMap.of(LEADER_ID, false)), testKit.getRef());
1097         ServerChangeReply reply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), ServerChangeReply.class);
1098         assertEquals("getStatus", ServerChangeStatus.INVALID_REQUEST, reply.getStatus());
1099
1100         LOG.info("testChangeLeaderToNonVotingInSingleNode ending");
1101     }
1102
1103     @Test
1104     public void testChangeToVotingWithNoLeader() {
1105         LOG.info("testChangeToVotingWithNoLeader starting");
1106
1107         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
1108         configParams.setHeartBeatInterval(new FiniteDuration(100, TimeUnit.MILLISECONDS));
1109         configParams.setElectionTimeoutFactor(5);
1110
1111         final String node1ID = "node1";
1112         final String node2ID = "node2";
1113
1114         // Set up a persisted ServerConfigurationPayload. Initially node1 and node2 will come up as non-voting.
1115         // via the server config. The server config will also contain 2 voting peers that are down (ie no
1116         // actors created).
1117
1118         ServerConfigurationPayload persistedServerConfig = new ServerConfigurationPayload(Arrays.asList(
1119                 new ServerInfo(node1ID, false), new ServerInfo(node2ID, false),
1120                 new ServerInfo("downNode1", true), new ServerInfo("downNode2", true)));
1121         ReplicatedLogImplEntry persistedServerConfigEntry = new ReplicatedLogImplEntry(0, 1, persistedServerConfig);
1122
1123         InMemoryJournal.addEntry(node1ID, 1, new UpdateElectionTerm(1, "downNode1"));
1124         InMemoryJournal.addEntry(node1ID, 2, persistedServerConfigEntry);
1125         InMemoryJournal.addEntry(node1ID, 3, new ApplyJournalEntries(0));
1126         InMemoryJournal.addEntry(node2ID, 1, new UpdateElectionTerm(1, "downNode2"));
1127         InMemoryJournal.addEntry(node2ID, 2, persistedServerConfigEntry);
1128         InMemoryJournal.addEntry(node2ID, 3, new ApplyJournalEntries(0));
1129
1130         TestActorRef<MessageCollectorActor> node1Collector = actorFactory.createTestActor(
1131                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
1132                 actorFactory.generateActorId("collector"));
1133         TestActorRef<CollectingMockRaftActor> node1RaftActorRef = actorFactory.createTestActor(
1134                 CollectingMockRaftActor.props(node1ID, ImmutableMap.<String, String>of(), configParams,
1135                         PERSISTENT, node1Collector).withDispatcher(Dispatchers.DefaultDispatcherId()), node1ID);
1136         CollectingMockRaftActor node1RaftActor = node1RaftActorRef.underlyingActor();
1137
1138         TestActorRef<MessageCollectorActor> node2Collector = actorFactory.createTestActor(
1139                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
1140                 actorFactory.generateActorId("collector"));
1141         TestActorRef<CollectingMockRaftActor> node2RaftActorRef = actorFactory.createTestActor(
1142                 CollectingMockRaftActor.props(node2ID, ImmutableMap.<String, String>of(), configParams,
1143                         PERSISTENT, node2Collector).withDispatcher(Dispatchers.DefaultDispatcherId()), node2ID);
1144         CollectingMockRaftActor node2RaftActor = node2RaftActorRef.underlyingActor();
1145
1146         node1RaftActor.waitForInitializeBehaviorComplete();
1147         node2RaftActor.waitForInitializeBehaviorComplete();
1148
1149         // Verify the intended server config was loaded and applied.
1150         verifyServerConfigurationPayloadEntry(node1RaftActor.getRaftActorContext().getReplicatedLog(),
1151                 nonVotingServer(node1ID), nonVotingServer(node2ID), votingServer("downNode1"),
1152                 votingServer("downNode2"));
1153         assertEquals("isVotingMember", false, node1RaftActor.getRaftActorContext().isVotingMember());
1154         assertEquals("getRaftState", RaftState.Follower, node1RaftActor.getRaftState());
1155         assertEquals("getLeaderId", null, node1RaftActor.getLeaderId());
1156
1157         verifyServerConfigurationPayloadEntry(node2RaftActor.getRaftActorContext().getReplicatedLog(),
1158                 nonVotingServer(node1ID), nonVotingServer(node2ID), votingServer("downNode1"),
1159                 votingServer("downNode2"));
1160         assertEquals("isVotingMember", false, node2RaftActor.getRaftActorContext().isVotingMember());
1161
1162         // For the test, we send a ChangeServersVotingStatus message to node1 to flip the voting states for
1163         // each server, ie node1 and node2 to voting and the 2 down nodes to non-voting. This should cause
1164         // node1 to try to elect itself as leader in order to apply the new server config. Since the 2
1165         // down nodes are switched to non-voting, node1 should only need a vote from node2.
1166
1167         // First send the message such that node1 has no peer address for node2 - should fail.
1168
1169         ChangeServersVotingStatus changeServers = new ChangeServersVotingStatus(ImmutableMap.of(node1ID, true,
1170                 node2ID, true, "downNode1", false, "downNode2", false));
1171         node1RaftActorRef.tell(changeServers, testKit.getRef());
1172         ServerChangeReply reply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), ServerChangeReply.class);
1173         assertEquals("getStatus", ServerChangeStatus.NO_LEADER, reply.getStatus());
1174
1175         // Send an AppendEntries so node1 has a leaderId
1176
1177         MessageCollectorActor.clearMessages(node1Collector);
1178
1179         long term = node1RaftActor.getRaftActorContext().getTermInformation().getCurrentTerm();
1180         node1RaftActorRef.tell(new AppendEntries(term, "downNode1", -1L, -1L,
1181                 Collections.<ReplicatedLogEntry>emptyList(), 0, -1, (short)1), ActorRef.noSender());
1182
1183         // Wait for the ElectionTimeout to clear the leaderId. he leaderId must be null so on the
1184         // ChangeServersVotingStatus message, it will try to elect a leader.
1185
1186         MessageCollectorActor.expectFirstMatching(node1Collector, ElectionTimeout.class);
1187
1188         // Update node2's peer address and send the message again
1189
1190         node1RaftActor.setPeerAddress(node2ID, node2RaftActorRef.path().toString());
1191
1192         node1RaftActorRef.tell(changeServers, testKit.getRef());
1193         reply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), ServerChangeReply.class);
1194         assertEquals("getStatus", ServerChangeStatus.OK, reply.getStatus());
1195
1196         ApplyJournalEntries apply = MessageCollectorActor.expectFirstMatching(node1Collector, ApplyJournalEntries.class);
1197         assertEquals("getToIndex", 1, apply.getToIndex());
1198         verifyServerConfigurationPayloadEntry(node1RaftActor.getRaftActorContext().getReplicatedLog(),
1199                 votingServer(node1ID), votingServer(node2ID), nonVotingServer("downNode1"),
1200                 nonVotingServer("downNode2"));
1201         assertEquals("isVotingMember", true, node1RaftActor.getRaftActorContext().isVotingMember());
1202         assertEquals("getRaftState", RaftState.Leader, node1RaftActor.getRaftState());
1203
1204         apply = MessageCollectorActor.expectFirstMatching(node2Collector, ApplyJournalEntries.class);
1205         assertEquals("getToIndex", 1, apply.getToIndex());
1206         verifyServerConfigurationPayloadEntry(node2RaftActor.getRaftActorContext().getReplicatedLog(),
1207                 votingServer(node1ID), votingServer(node2ID), nonVotingServer("downNode1"),
1208                 nonVotingServer("downNode2"));
1209         assertEquals("isVotingMember", true, node2RaftActor.getRaftActorContext().isVotingMember());
1210         assertEquals("getRaftState", RaftState.Follower, node2RaftActor.getRaftState());
1211
1212         LOG.info("testChangeToVotingWithNoLeader ending");
1213     }
1214
1215     @Test
1216     public void testChangeToVotingWithNoLeaderAndElectionTimeout() {
1217         LOG.info("testChangeToVotingWithNoLeaderAndElectionTimeout starting");
1218
1219         final String node1ID = "node1";
1220         final String node2ID = "node2";
1221
1222         PeerAddressResolver peerAddressResolver = peerId -> peerId.equals(node1ID) ? actorFactory.createTestActorPath(node1ID) :
1223             peerId.equals(node2ID) ? actorFactory.createTestActorPath(node2ID) : null;
1224
1225         ServerConfigurationPayload persistedServerConfig = new ServerConfigurationPayload(Arrays.asList(
1226                 new ServerInfo(node1ID, false), new ServerInfo(node2ID, true)));
1227         ReplicatedLogImplEntry persistedServerConfigEntry = new ReplicatedLogImplEntry(0, 1, persistedServerConfig);
1228
1229         InMemoryJournal.addEntry(node1ID, 1, new UpdateElectionTerm(1, "node1"));
1230         InMemoryJournal.addEntry(node1ID, 2, persistedServerConfigEntry);
1231         InMemoryJournal.addEntry(node2ID, 1, new UpdateElectionTerm(1, "node1"));
1232         InMemoryJournal.addEntry(node2ID, 2, persistedServerConfigEntry);
1233
1234         DefaultConfigParamsImpl configParams1 = new DefaultConfigParamsImpl();
1235         configParams1.setHeartBeatInterval(new FiniteDuration(100, TimeUnit.MILLISECONDS));
1236         configParams1.setElectionTimeoutFactor(1);
1237         configParams1.setPeerAddressResolver(peerAddressResolver);
1238         TestActorRef<MessageCollectorActor> node1Collector = actorFactory.createTestActor(
1239                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
1240                 actorFactory.generateActorId("collector"));
1241         TestActorRef<CollectingMockRaftActor> node1RaftActorRef = actorFactory.createTestActor(
1242                 CollectingMockRaftActor.props(node1ID, ImmutableMap.<String, String>of(), configParams1,
1243                         PERSISTENT, node1Collector).withDispatcher(Dispatchers.DefaultDispatcherId()), node1ID);
1244         CollectingMockRaftActor node1RaftActor = node1RaftActorRef.underlyingActor();
1245
1246         DefaultConfigParamsImpl configParams2 = new DefaultConfigParamsImpl();
1247         configParams2.setElectionTimeoutFactor(1000000);
1248         configParams2.setPeerAddressResolver(peerAddressResolver);
1249         TestActorRef<MessageCollectorActor> node2Collector = actorFactory.createTestActor(
1250                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
1251                 actorFactory.generateActorId("collector"));
1252         TestActorRef<CollectingMockRaftActor> node2RaftActorRef = actorFactory.createTestActor(
1253                 CollectingMockRaftActor.props(node2ID, ImmutableMap.<String, String>of(), configParams2,
1254                         PERSISTENT, node2Collector).withDispatcher(Dispatchers.DefaultDispatcherId()), node2ID);
1255         CollectingMockRaftActor node2RaftActor = node2RaftActorRef.underlyingActor();
1256
1257         // Send a ChangeServersVotingStatus message to node1 to change mode1 to voting. This should cause
1258         // node1 to try to elect itself as leader in order to apply the new server config. But we'll drop
1259         // RequestVote messages in node2 which should cause node1 to time out and revert back to the previous
1260         // server config and fail with NO_LEADER. Note that node1 shouldn't forward the request to node2 b/c
1261         // node2 was previously voting.
1262
1263         node2RaftActor.setDropMessageOfType(RequestVote.class);
1264
1265         ChangeServersVotingStatus changeServers = new ChangeServersVotingStatus(ImmutableMap.of(node1ID, true));
1266         node1RaftActorRef.tell(changeServers, testKit.getRef());
1267         ServerChangeReply reply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), ServerChangeReply.class);
1268         assertEquals("getStatus", ServerChangeStatus.NO_LEADER, reply.getStatus());
1269
1270         assertEquals("Server config", Sets.newHashSet(nonVotingServer(node1ID), votingServer(node2ID)),
1271                 Sets.newHashSet(node1RaftActor.getRaftActorContext().getPeerServerInfo(true).getServerConfig()));
1272         assertEquals("getRaftState", RaftState.Follower, node1RaftActor.getRaftState());
1273
1274         LOG.info("testChangeToVotingWithNoLeaderAndElectionTimeout ending");
1275     }
1276
1277     @Test
1278     public void testChangeToVotingWithNoLeaderAndForwardedToOtherNodeAfterElectionTimeout() {
1279         LOG.info("testChangeToVotingWithNoLeaderAndForwardedToOtherNodeAfterElectionTimeout starting");
1280
1281         final String node1ID = "node1";
1282         final String node2ID = "node2";
1283
1284         PeerAddressResolver peerAddressResolver = peerId -> peerId.equals(node1ID) ? actorFactory.createTestActorPath(node1ID) :
1285             peerId.equals(node2ID) ? actorFactory.createTestActorPath(node2ID) : null;
1286
1287         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
1288         configParams.setHeartBeatInterval(new FiniteDuration(100, TimeUnit.MILLISECONDS));
1289         configParams.setElectionTimeoutFactor(3);
1290         configParams.setPeerAddressResolver(peerAddressResolver);
1291
1292         ServerConfigurationPayload persistedServerConfig = new ServerConfigurationPayload(Arrays.asList(
1293                 new ServerInfo(node1ID, false), new ServerInfo(node2ID, false)));
1294         ReplicatedLogImplEntry persistedServerConfigEntry = new ReplicatedLogImplEntry(0, 1, persistedServerConfig);
1295
1296         InMemoryJournal.addEntry(node1ID, 1, new UpdateElectionTerm(1, "node1"));
1297         InMemoryJournal.addEntry(node1ID, 2, persistedServerConfigEntry);
1298         InMemoryJournal.addEntry(node2ID, 1, new UpdateElectionTerm(1, "node1"));
1299         InMemoryJournal.addEntry(node2ID, 2, persistedServerConfigEntry);
1300         InMemoryJournal.addEntry(node2ID, 3, new ReplicatedLogImplEntry(1, 1,
1301                 new MockRaftActorContext.MockPayload("2")));
1302
1303         TestActorRef<MessageCollectorActor> node1Collector = actorFactory.createTestActor(
1304                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
1305                 actorFactory.generateActorId("collector"));
1306         TestActorRef<CollectingMockRaftActor> node1RaftActorRef = actorFactory.createTestActor(
1307                 CollectingMockRaftActor.props(node1ID, ImmutableMap.<String, String>of(), configParams,
1308                         PERSISTENT, node1Collector).withDispatcher(Dispatchers.DefaultDispatcherId()), node1ID);
1309         CollectingMockRaftActor node1RaftActor = node1RaftActorRef.underlyingActor();
1310
1311         TestActorRef<MessageCollectorActor> node2Collector = actorFactory.createTestActor(
1312                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
1313                 actorFactory.generateActorId("collector"));
1314         TestActorRef<CollectingMockRaftActor> node2RaftActorRef = actorFactory.createTestActor(
1315                 CollectingMockRaftActor.props(node2ID, ImmutableMap.<String, String>of(), configParams,
1316                         PERSISTENT, node2Collector).withDispatcher(Dispatchers.DefaultDispatcherId()), node2ID);
1317         CollectingMockRaftActor node2RaftActor = node2RaftActorRef.underlyingActor();
1318
1319         // Send a ChangeServersVotingStatus message to node1 to change mode1 to voting. This should cause
1320         // node1 to try to elect itself as leader in order to apply the new server config. However node1's log
1321         // is behind node2's so node2 should not grant node1's vote. This should cause node1 to time out and
1322         // forward the request to node2.
1323
1324         ChangeServersVotingStatus changeServers = new ChangeServersVotingStatus(
1325                 ImmutableMap.of(node1ID, true, node2ID, true));
1326         node1RaftActorRef.tell(changeServers, testKit.getRef());
1327         ServerChangeReply reply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), ServerChangeReply.class);
1328         assertEquals("getStatus", ServerChangeStatus.OK, reply.getStatus());
1329
1330         MessageCollectorActor.expectFirstMatching(node2Collector, ApplyJournalEntries.class);
1331         verifyServerConfigurationPayloadEntry(node2RaftActor.getRaftActorContext().getReplicatedLog(),
1332                 votingServer(node1ID), votingServer(node2ID));
1333         assertEquals("getRaftState", RaftState.Leader, node2RaftActor.getRaftState());
1334
1335         MessageCollectorActor.expectFirstMatching(node1Collector, ApplyJournalEntries.class);
1336         verifyServerConfigurationPayloadEntry(node1RaftActor.getRaftActorContext().getReplicatedLog(),
1337                 votingServer(node1ID), votingServer(node2ID));
1338         assertEquals("isVotingMember", true, node1RaftActor.getRaftActorContext().isVotingMember());
1339         assertEquals("getRaftState", RaftState.Follower, node1RaftActor.getRaftState());
1340
1341         LOG.info("testChangeToVotingWithNoLeaderAndForwardedToOtherNodeAfterElectionTimeout ending");
1342     }
1343
1344     @Test
1345     public void testChangeToVotingWithNoLeaderAndOtherLeaderElected() {
1346         LOG.info("testChangeToVotingWithNoLeaderAndOtherLeaderElected starting");
1347
1348         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
1349         configParams.setHeartBeatInterval(new FiniteDuration(100, TimeUnit.MILLISECONDS));
1350         configParams.setElectionTimeoutFactor(100000);
1351
1352         final String node1ID = "node1";
1353         final String node2ID = "node2";
1354
1355         configParams.setPeerAddressResolver(peerId -> peerId.equals(node1ID) ? actorFactory.createTestActorPath(node1ID) :
1356             peerId.equals(node2ID) ? actorFactory.createTestActorPath(node2ID) : null);
1357
1358         ServerConfigurationPayload persistedServerConfig = new ServerConfigurationPayload(Arrays.asList(
1359                 new ServerInfo(node1ID, false), new ServerInfo(node2ID, true)));
1360         ReplicatedLogImplEntry persistedServerConfigEntry = new ReplicatedLogImplEntry(0, 1, persistedServerConfig);
1361
1362         InMemoryJournal.addEntry(node1ID, 1, new UpdateElectionTerm(1, "node1"));
1363         InMemoryJournal.addEntry(node1ID, 2, persistedServerConfigEntry);
1364         InMemoryJournal.addEntry(node2ID, 1, new UpdateElectionTerm(1, "node1"));
1365         InMemoryJournal.addEntry(node2ID, 2, persistedServerConfigEntry);
1366
1367         TestActorRef<MessageCollectorActor> node1Collector = actorFactory.createTestActor(
1368                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
1369                 actorFactory.generateActorId("collector"));
1370         TestActorRef<CollectingMockRaftActor> node1RaftActorRef = actorFactory.createTestActor(
1371                 CollectingMockRaftActor.props(node1ID, ImmutableMap.<String, String>of(), configParams,
1372                         PERSISTENT, node1Collector).withDispatcher(Dispatchers.DefaultDispatcherId()), node1ID);
1373         CollectingMockRaftActor node1RaftActor = node1RaftActorRef.underlyingActor();
1374
1375         TestActorRef<MessageCollectorActor> node2Collector = actorFactory.createTestActor(
1376                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
1377                 actorFactory.generateActorId("collector"));
1378         TestActorRef<CollectingMockRaftActor> node2RaftActorRef = actorFactory.createTestActor(
1379                 CollectingMockRaftActor.props(node2ID, ImmutableMap.<String, String>of(), configParams,
1380                         PERSISTENT, node2Collector).withDispatcher(Dispatchers.DefaultDispatcherId()), node2ID);
1381         CollectingMockRaftActor node2RaftActor = node2RaftActorRef.underlyingActor();
1382
1383         // Send a ChangeServersVotingStatus message to node1 to change node1 to voting. This should cause
1384         // node1 to try to elect itself as leader in order to apply the new server config. But we'll drop
1385         // RequestVote messages in node2 and make it the leader so node1 should forward the server change
1386         // request to node2 when node2 is elected.
1387
1388         node2RaftActor.setDropMessageOfType(RequestVote.class);
1389
1390         ChangeServersVotingStatus changeServers = new ChangeServersVotingStatus(ImmutableMap.of(node1ID, true,
1391                 node2ID, true));
1392         node1RaftActorRef.tell(changeServers, testKit.getRef());
1393
1394         MessageCollectorActor.expectFirstMatching(node2Collector, RequestVote.class);
1395
1396         node2RaftActorRef.tell(TimeoutNow.INSTANCE, ActorRef.noSender());
1397
1398         ServerChangeReply reply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), ServerChangeReply.class);
1399         assertEquals("getStatus", ServerChangeStatus.OK, reply.getStatus());
1400
1401         MessageCollectorActor.expectFirstMatching(node1Collector, ApplyJournalEntries.class);
1402         verifyServerConfigurationPayloadEntry(node1RaftActor.getRaftActorContext().getReplicatedLog(),
1403                 votingServer(node1ID), votingServer(node2ID));
1404         assertEquals("isVotingMember", true, node1RaftActor.getRaftActorContext().isVotingMember());
1405         assertEquals("getRaftState", RaftState.Follower, node1RaftActor.getRaftState());
1406
1407         MessageCollectorActor.expectFirstMatching(node2Collector, ApplyJournalEntries.class);
1408         verifyServerConfigurationPayloadEntry(node2RaftActor.getRaftActorContext().getReplicatedLog(),
1409                 votingServer(node1ID), votingServer(node2ID));
1410         assertEquals("getRaftState", RaftState.Leader, node2RaftActor.getRaftState());
1411
1412         LOG.info("testChangeToVotingWithNoLeaderAndOtherLeaderElected ending");
1413     }
1414
1415     private static void verifyRaftState(RaftState expState, RaftActor... raftActors) {
1416         Stopwatch sw = Stopwatch.createStarted();
1417         while(sw.elapsed(TimeUnit.SECONDS) <= 5) {
1418             for(RaftActor raftActor: raftActors) {
1419                 if(raftActor.getRaftState() == expState) {
1420                     return;
1421                 }
1422             }
1423         }
1424
1425         fail("None of the RaftActors have state " + expState);
1426     }
1427
1428     private static ServerInfo votingServer(String id) {
1429         return new ServerInfo(id, true);
1430     }
1431
1432     private static ServerInfo nonVotingServer(String id) {
1433         return new ServerInfo(id, false);
1434     }
1435
1436     private TestActorRef<MessageCollectorActor> newLeaderCollectorActor(MockLeaderRaftActor leaderRaftActor) {
1437         return newCollectorActor(leaderRaftActor, LEADER_ID);
1438     }
1439
1440     private TestActorRef<MessageCollectorActor> newCollectorActor(AbstractMockRaftActor raftActor, String id) {
1441         TestActorRef<MessageCollectorActor> collectorActor = actorFactory.createTestActor(
1442                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
1443                 actorFactory.generateActorId(id + "Collector"));
1444         raftActor.setCollectorActor(collectorActor);
1445         return collectorActor;
1446     }
1447
1448     private static void verifyServerConfigurationPayloadEntry(ReplicatedLog log, ServerInfo... expected) {
1449         ReplicatedLogEntry logEntry = log.get(log.lastIndex());
1450         assertEquals("Last log entry payload class", ServerConfigurationPayload.class, logEntry.getData().getClass());
1451         ServerConfigurationPayload payload = (ServerConfigurationPayload)logEntry.getData();
1452         assertEquals("Server config", Sets.newHashSet(expected), Sets.newHashSet(payload.getServerConfig()));
1453     }
1454
1455     private static RaftActorContextImpl newFollowerContext(String id, TestActorRef<? extends UntypedActor> actor) {
1456         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
1457         configParams.setHeartBeatInterval(new FiniteDuration(100, TimeUnit.MILLISECONDS));
1458         configParams.setElectionTimeoutFactor(100000);
1459         NonPersistentDataProvider noPersistence = new NonPersistentDataProvider();
1460         ElectionTermImpl termInfo = new ElectionTermImpl(noPersistence, id, LOG);
1461         termInfo.update(1, LEADER_ID);
1462         return new RaftActorContextImpl(actor, actor.underlyingActor().getContext(),
1463                 id, termInfo, -1, -1, ImmutableMap.of(LEADER_ID, ""), configParams, noPersistence, LOG);
1464     }
1465
1466     static abstract class AbstractMockRaftActor extends MockRaftActor {
1467         private volatile TestActorRef<MessageCollectorActor> collectorActor;
1468         private volatile Class<?> dropMessageOfType;
1469
1470         AbstractMockRaftActor(String id, Map<String, String> peerAddresses, Optional<ConfigParams> config,
1471                 boolean persistent, TestActorRef<MessageCollectorActor> collectorActor) {
1472             super(builder().id(id).peerAddresses(peerAddresses).config(config.get()).
1473                     persistent(Optional.of(persistent)));
1474             this.collectorActor = collectorActor;
1475         }
1476
1477         void setDropMessageOfType(Class<?> dropMessageOfType) {
1478             this.dropMessageOfType = dropMessageOfType;
1479         }
1480
1481         void setCollectorActor(TestActorRef<MessageCollectorActor> collectorActor) {
1482             this.collectorActor = collectorActor;
1483         }
1484
1485         @Override
1486         public void handleCommand(Object message) {
1487             if(dropMessageOfType == null || !dropMessageOfType.equals(message.getClass())) {
1488                 super.handleCommand(message);
1489             }
1490
1491             if(collectorActor != null) {
1492                 collectorActor.tell(message, getSender());
1493             }
1494         }
1495     }
1496
1497     public static class CollectingMockRaftActor extends AbstractMockRaftActor {
1498
1499         CollectingMockRaftActor(String id, Map<String, String> peerAddresses, Optional<ConfigParams> config,
1500                 boolean persistent, TestActorRef<MessageCollectorActor> collectorActor) {
1501             super(id, peerAddresses, config, persistent, collectorActor);
1502             snapshotCohortDelegate = new RaftActorSnapshotCohort() {
1503                 @Override
1504                 public void createSnapshot(ActorRef actorRef) {
1505                     actorRef.tell(new CaptureSnapshotReply(new byte[0]), actorRef);
1506                 }
1507
1508                 @Override
1509                 public void applySnapshot(byte[] snapshotBytes) {
1510                 }
1511             };
1512         }
1513
1514         public static Props props(final String id, final Map<String, String> peerAddresses,
1515                 ConfigParams config, boolean persistent, TestActorRef<MessageCollectorActor> collectorActor){
1516
1517             return Props.create(CollectingMockRaftActor.class, id, peerAddresses, Optional.of(config),
1518                     persistent, collectorActor);
1519         }
1520
1521     }
1522
1523     public static class MockLeaderRaftActor extends AbstractMockRaftActor {
1524         public MockLeaderRaftActor(Map<String, String> peerAddresses, ConfigParams config,
1525                 RaftActorContext fromContext) {
1526             super(LEADER_ID, peerAddresses, Optional.of(config), NO_PERSISTENCE, null);
1527             setPersistence(false);
1528
1529             RaftActorContext context = getRaftActorContext();
1530             for(int i = 0; i < fromContext.getReplicatedLog().size(); i++) {
1531                 ReplicatedLogEntry entry = fromContext.getReplicatedLog().get(i);
1532                 getState().add(entry.getData());
1533                 context.getReplicatedLog().append(entry);
1534             }
1535
1536             context.setCommitIndex(fromContext.getCommitIndex());
1537             context.setLastApplied(fromContext.getLastApplied());
1538             context.getTermInformation().update(fromContext.getTermInformation().getCurrentTerm(),
1539                     fromContext.getTermInformation().getVotedFor());
1540         }
1541
1542         @Override
1543         protected void initializeBehavior() {
1544             changeCurrentBehavior(new Leader(getRaftActorContext()));
1545             initializeBehaviorComplete.countDown();
1546         }
1547
1548         @Override
1549         public void createSnapshot(ActorRef actorRef) {
1550             try {
1551                 actorRef.tell(new CaptureSnapshotReply(RaftActorTest.fromObject(getState()).toByteArray()), actorRef);
1552             } catch (Exception e) {
1553                 LOG.error("createSnapshot failed", e);
1554             }
1555         }
1556
1557         static Props props(Map<String, String> peerAddresses, RaftActorContext fromContext) {
1558             DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
1559             configParams.setHeartBeatInterval(new FiniteDuration(100, TimeUnit.MILLISECONDS));
1560             configParams.setElectionTimeoutFactor(10);
1561             return Props.create(MockLeaderRaftActor.class, peerAddresses, configParams, fromContext);
1562         }
1563     }
1564
1565     public static class MockNewFollowerRaftActor extends AbstractMockRaftActor {
1566         public MockNewFollowerRaftActor(ConfigParams config, TestActorRef<MessageCollectorActor> collectorActor) {
1567             super(NEW_SERVER_ID, Maps.<String, String>newHashMap(), Optional.of(config), NO_PERSISTENCE, collectorActor);
1568             setPersistence(false);
1569         }
1570
1571         static Props props(ConfigParams config, TestActorRef<MessageCollectorActor> collectorActor) {
1572             return Props.create(MockNewFollowerRaftActor.class, config, collectorActor);
1573         }
1574     }
1575 }