opendaylight/md-sal/sal-akka-raft/src/test/java/org/opendaylight/controller/cluster/raft/ReplicationAndSnapshotsIntegrationTest.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
  12 import akka.persistence.SaveSnapshotSuccess;
  13 import com.google.common.collect.ImmutableMap;
  14 import java.util.List;
  15 import org.junit.Test;
  16 import org.opendaylight.controller.cluster.raft.MockRaftActorContext.MockPayload;
  17 import org.opendaylight.controller.cluster.raft.base.messages.ApplyState;
  18 import org.opendaylight.controller.cluster.raft.base.messages.CaptureSnapshotReply;
  19 import org.opendaylight.controller.cluster.raft.messages.AppendEntries;
  20 import org.opendaylight.controller.cluster.raft.messages.AppendEntriesReply;
  21 import org.opendaylight.controller.cluster.raft.persisted.ApplyJournalEntries;
  22 import org.opendaylight.controller.cluster.raft.persisted.SimpleReplicatedLogEntry;
  23 import org.opendaylight.controller.cluster.raft.persisted.UpdateElectionTerm;
  24 import org.opendaylight.controller.cluster.raft.utils.InMemoryJournal;
  25 import org.opendaylight.controller.cluster.raft.utils.InMemorySnapshotStore;
  26 import org.opendaylight.controller.cluster.raft.utils.MessageCollectorActor;
  27
  28 /**
  29  * Tests replication and snapshots end-to-end using real RaftActors and behavior communication.
  30  *
  31  * @author Thomas Pantelis
  32  */
  33 public class ReplicationAndSnapshotsIntegrationTest extends AbstractRaftActorIntegrationTest {
  34
  35     private List<SimpleReplicatedLogEntry> origLeaderJournal;
  36
  37     private MockPayload recoveredPayload0;
  38     private MockPayload recoveredPayload1;
  39     private MockPayload recoveredPayload2;
  40     private MockPayload payload3;
  41     private MockPayload payload4;
  42     private MockPayload payload5;
  43     private MockPayload payload6;
  44     private MockPayload payload7;
  45
  46     @Test
  47     public void runTest() throws Exception {
  48         testLog.info("testReplicationAndSnapshots starting");
  49
  50         // Setup the persistent journal for the leader. We'll start up with 3 journal log entries (one less
  51         // than the snapshotBatchCount).
  52         long seqId = 1;
  53         InMemoryJournal.addEntry(leaderId, seqId++, new UpdateElectionTerm(initialTerm, leaderId));
  54         recoveredPayload0 = new MockPayload("zero");
  55         InMemoryJournal.addEntry(leaderId, seqId++, new SimpleReplicatedLogEntry(0, initialTerm, recoveredPayload0));
  56         recoveredPayload1 = new MockPayload("one");
  57         InMemoryJournal.addEntry(leaderId, seqId++, new SimpleReplicatedLogEntry(1, initialTerm, recoveredPayload1));
  58         recoveredPayload2 = new MockPayload("two");
  59         InMemoryJournal.addEntry(leaderId, seqId++, new SimpleReplicatedLogEntry(2, initialTerm, recoveredPayload2));
  60         InMemoryJournal.addEntry(leaderId, seqId++, new ApplyJournalEntries(2));
  61
  62         origLeaderJournal = InMemoryJournal.get(leaderId, SimpleReplicatedLogEntry.class);
  63
  64         // Create the leader and 2 follower actors and verify initial syncing of the followers after leader
  65         // persistence recovery.
  66
  67         DefaultConfigParamsImpl followerConfigParams = newFollowerConfigParams();
  68         followerConfigParams.setSnapshotBatchCount(snapshotBatchCount);
  69         follower1Actor = newTestRaftActor(follower1Id, ImmutableMap.of(leaderId, testActorPath(leaderId),
  70                 follower2Id, testActorPath(follower2Id)), followerConfigParams);
  71
  72         follower2Actor = newTestRaftActor(follower2Id, ImmutableMap.of(leaderId, testActorPath(leaderId),
  73                 follower1Id, testActorPath(follower1Id)), followerConfigParams);
  74
  75         peerAddresses = ImmutableMap.<String, String>builder()
  76                 .put(follower1Id, follower1Actor.path().toString())
  77                 .put(follower2Id, follower2Actor.path().toString()).build();
  78
  79         leaderConfigParams = newLeaderConfigParams();
  80         leaderActor = newTestRaftActor(leaderId, peerAddresses, leaderConfigParams);
  81
  82         follower1CollectorActor = follower1Actor.underlyingActor().collectorActor();
  83         follower2CollectorActor = follower2Actor.underlyingActor().collectorActor();
  84         leaderCollectorActor = leaderActor.underlyingActor().collectorActor();
  85
  86         leaderContext = leaderActor.underlyingActor().getRaftActorContext();
  87
  88         verifyLeaderRecoveryAndInitialization();
  89
  90         testFirstSnapshot();
  91
  92         testSubsequentReplications();
  93
  94         testSecondSnapshot();
  95
  96         testLeaderReinstatement();
  97
  98         testLog.info("testReplicationAndSnapshots ending");
  99     }
 100
 101     /**
 102      * Verify the expected leader is elected as the leader and verify initial syncing of the followers
 103      * from the leader's persistence recovery.
 104      */
 105     void verifyLeaderRecoveryAndInitialization() {
 106         testLog.info("verifyLeaderRecoveryAndInitialization starting");
 107
 108         waitUntilLeader(leaderActor);
 109
 110         currentTerm = leaderContext.getTermInformation().getCurrentTerm();
 111         assertEquals("Current term > " + initialTerm, true, currentTerm > initialTerm);
 112
 113         leader = leaderActor.underlyingActor().getCurrentBehavior();
 114
 115         // The followers should receive AppendEntries for each leader log entry that was recovered from
 116         // persistence and apply each one.
 117         List<ApplyState> applyStates = MessageCollectorActor.expectMatching(
 118                 follower1CollectorActor, ApplyState.class, 3);
 119         verifyApplyState(applyStates.get(0), null, null, initialTerm, 0, recoveredPayload0);
 120         verifyApplyState(applyStates.get(1), null, null, initialTerm, 1, recoveredPayload1);
 121         verifyApplyState(applyStates.get(2), null, null, initialTerm, 2, recoveredPayload2);
 122
 123         // Verify follower 1 applies a log entry for at least the last entry index.
 124         verifyApplyJournalEntries(follower1CollectorActor, 2);
 125
 126         applyStates = MessageCollectorActor.expectMatching(follower2CollectorActor, ApplyState.class, 3);
 127         verifyApplyState(applyStates.get(0), null, null, initialTerm, 0, recoveredPayload0);
 128         verifyApplyState(applyStates.get(1), null, null, initialTerm, 1, recoveredPayload1);
 129         verifyApplyState(applyStates.get(2), null, null, initialTerm, 2, recoveredPayload2);
 130
 131         // Verify follower 1]2 applies a log entry for at least the last entry index.
 132         verifyApplyJournalEntries(follower2CollectorActor, 2);
 133
 134         MessageCollectorActor.clearMessages(leaderCollectorActor);
 135         MessageCollectorActor.clearMessages(follower1CollectorActor);
 136         MessageCollectorActor.clearMessages(follower2CollectorActor);
 137
 138         // The leader should have performed fake snapshots due to the follower's AppendEntriesReplies and
 139         // trimmed the in-memory log so that only the last entry remains.
 140         assertEquals("Leader snapshot term", initialTerm, leaderContext.getReplicatedLog().getSnapshotTerm());
 141         assertEquals("Leader snapshot index", 1, leaderContext.getReplicatedLog().getSnapshotIndex());
 142         assertEquals("Leader journal log size", 1, leaderContext.getReplicatedLog().size());
 143         assertEquals("Leader journal last index", 2, leaderContext.getReplicatedLog().lastIndex());
 144         assertEquals("Leader commit index", 2, leaderContext.getCommitIndex());
 145         assertEquals("Leader last applied", 2, leaderContext.getLastApplied());
 146         assertEquals("Leader replicatedToAllIndex", 1, leader.getReplicatedToAllIndex());
 147
 148         // Verify the follower's persisted journal log.
 149         verifyPersistedJournal(follower1Id, origLeaderJournal);
 150         verifyPersistedJournal(follower2Id, origLeaderJournal);
 151
 152         MessageCollectorActor.clearMessages(leaderCollectorActor);
 153         MessageCollectorActor.clearMessages(follower1CollectorActor);
 154         MessageCollectorActor.clearMessages(follower2CollectorActor);
 155
 156         testLog.info("verifyLeaderRecoveryAndInitialization ending");
 157     }
 158
 159     /**
 160      * Send a payload to the TestRaftActor to persist and replicate. Since snapshotBatchCount is set to
 161      * 4 and we already have 3 entries in the journal log, this should initiate a snapshot. In this
 162      * scenario, the follower consensus and application of state is delayed until after the snapshot
 163      * completes.
 164      */
 165     private void testFirstSnapshot() throws Exception {
 166         testLog.info("testFirstSnapshot starting");
 167
 168         expSnapshotState.add(recoveredPayload0);
 169         expSnapshotState.add(recoveredPayload1);
 170         expSnapshotState.add(recoveredPayload2);
 171
 172         // Delay the consensus by temporarily dropping the AppendEntries to both followers.
 173         follower1Actor.underlyingActor().startDropMessages(AppendEntries.class);
 174         follower2Actor.underlyingActor().startDropMessages(AppendEntries.class);
 175
 176         // Send the payload.
 177         payload3 = sendPayloadData(leaderActor, "three");
 178
 179         // Wait for snapshot complete.
 180         MessageCollectorActor.expectFirstMatching(leaderCollectorActor, SaveSnapshotSuccess.class);
 181
 182         // The snapshot index should not be advanced nor the log trimmed because replicatedToAllIndex
 183         // is behind due the followers not being replicated yet via AppendEntries.
 184         assertEquals("Leader snapshot term", initialTerm, leaderContext.getReplicatedLog().getSnapshotTerm());
 185         assertEquals("Leader snapshot index", 1, leaderContext.getReplicatedLog().getSnapshotIndex());
 186         assertEquals("Leader journal log size", 2, leaderContext.getReplicatedLog().size());
 187         assertEquals("Leader journal last index", 3, leaderContext.getReplicatedLog().lastIndex());
 188
 189         // Verify the persisted snapshot in the leader. This should reflect the advanced snapshot index as
 190         // the last applied log entry (2) even though the leader hasn't yet advanced its cached snapshot index.
 191         List<Snapshot> persistedSnapshots = InMemorySnapshotStore.getSnapshots(leaderId, Snapshot.class);
 192         assertEquals("Persisted snapshots size", 1, persistedSnapshots.size());
 193         verifySnapshot("Persisted", persistedSnapshots.get(0), initialTerm, 2, currentTerm, 3);
 194         List<ReplicatedLogEntry> unAppliedEntry = persistedSnapshots.get(0).getUnAppliedEntries();
 195         assertEquals("Persisted Snapshot getUnAppliedEntries size", 1, unAppliedEntry.size());
 196         verifyReplicatedLogEntry(unAppliedEntry.get(0), currentTerm, 3, payload3);
 197
 198         // The leader's persisted journal log should be cleared since we snapshotted.
 199         List<SimpleReplicatedLogEntry> persistedLeaderJournal =
 200                 InMemoryJournal.get(leaderId, SimpleReplicatedLogEntry.class);
 201         assertEquals("Persisted journal log size", 0, persistedLeaderJournal.size());
 202
 203         // Allow AppendEntries to both followers to proceed. This should catch up the followers and cause a
 204         // "fake" snapshot in the leader to advance the snapshot index to 2. Also the state should be applied
 205         // in all members (via ApplyState).
 206         follower1Actor.underlyingActor().stopDropMessages(AppendEntries.class);
 207         follower2Actor.underlyingActor().stopDropMessages(AppendEntries.class);
 208
 209         ApplyState applyState = MessageCollectorActor.expectFirstMatching(leaderCollectorActor, ApplyState.class);
 210         verifyApplyState(applyState, leaderCollectorActor, payload3.toString(), currentTerm, 3, payload3);
 211
 212         verifyApplyJournalEntries(leaderCollectorActor, 3);
 213
 214         assertEquals("Leader commit index", 3, leaderContext.getCommitIndex());
 215
 216         applyState = MessageCollectorActor.expectFirstMatching(follower1CollectorActor, ApplyState.class);
 217         verifyApplyState(applyState, null, null, currentTerm, 3, payload3);
 218
 219         verifyApplyJournalEntries(follower1CollectorActor, 3);
 220
 221         applyState = MessageCollectorActor.expectFirstMatching(follower2CollectorActor, ApplyState.class);
 222         verifyApplyState(applyState, null, null, currentTerm, 3, payload3);
 223
 224         verifyApplyJournalEntries(follower2CollectorActor, 3);
 225
 226         assertEquals("Leader snapshot term", initialTerm, leaderContext.getReplicatedLog().getSnapshotTerm());
 227         assertEquals("Leader snapshot index", 2, leaderContext.getReplicatedLog().getSnapshotIndex());
 228         assertEquals("Leader journal log size", 1, leaderContext.getReplicatedLog().size());
 229         assertEquals("Leader commit index", 3, leaderContext.getCommitIndex());
 230         assertEquals("Leader last applied", 3, leaderContext.getLastApplied());
 231         assertEquals("Leader replicatedToAllIndex", 2, leader.getReplicatedToAllIndex());
 232
 233         // The followers should also snapshot so verify.
 234
 235         MessageCollectorActor.expectFirstMatching(follower1CollectorActor, SaveSnapshotSuccess.class);
 236         persistedSnapshots = InMemorySnapshotStore.getSnapshots(follower1Id, Snapshot.class);
 237         assertEquals("Persisted snapshots size", 1, persistedSnapshots.size());
 238         // The last applied index in the snapshot may or may not be the last log entry depending on
 239         // timing so to avoid intermittent test failures, we'll just verify the snapshot's last term/index.
 240         assertEquals("Follower1 Snapshot getLastTerm", currentTerm, persistedSnapshots.get(0).getLastTerm());
 241         assertEquals("Follower1 Snapshot getLastIndex", 3, persistedSnapshots.get(0).getLastIndex());
 242
 243         MessageCollectorActor.expectFirstMatching(follower2CollectorActor, SaveSnapshotSuccess.class);
 244
 245         MessageCollectorActor.clearMessages(leaderCollectorActor);
 246         MessageCollectorActor.clearMessages(follower1CollectorActor);
 247         MessageCollectorActor.clearMessages(follower2CollectorActor);
 248
 249         testLog.info("testFirstSnapshot ending");
 250     }
 251
 252     /**
 253      * Send 3 more payload instances and verify they get applied by all members.
 254      */
 255     private void testSubsequentReplications() {
 256         testLog.info("testSubsequentReplications starting");
 257
 258         payload4 = sendPayloadData(leaderActor, "four");
 259         payload5 = sendPayloadData(leaderActor, "five");
 260         payload6 = sendPayloadData(leaderActor, "six");
 261
 262         // Verify the leader applies the states.
 263         List<ApplyState> applyStates = MessageCollectorActor.expectMatching(leaderCollectorActor, ApplyState.class, 3);
 264         verifyApplyState(applyStates.get(0), leaderCollectorActor, payload4.toString(), currentTerm, 4, payload4);
 265         verifyApplyState(applyStates.get(1), leaderCollectorActor, payload5.toString(), currentTerm, 5, payload5);
 266         verifyApplyState(applyStates.get(2), leaderCollectorActor, payload6.toString(), currentTerm, 6, payload6);
 267
 268         // Verify the leader applies a log entry for at least the last entry index.
 269         verifyApplyJournalEntries(leaderCollectorActor, 6);
 270
 271         // The leader should have performed fake snapshots due to the follower's AppendEntriesReplies and
 272         // trimmed the in-memory log so that only the last entry remains.
 273         assertEquals("Leader snapshot term", currentTerm, leaderContext.getReplicatedLog().getSnapshotTerm());
 274         assertEquals("Leader snapshot index", 5, leaderContext.getReplicatedLog().getSnapshotIndex());
 275         assertEquals("Leader journal log size", 1, leaderContext.getReplicatedLog().size());
 276         assertEquals("Leader journal last index", 6, leaderContext.getReplicatedLog().lastIndex());
 277         assertEquals("Leader commit index", 6, leaderContext.getCommitIndex());
 278         assertEquals("Leader last applied", 6, leaderContext.getLastApplied());
 279         assertEquals("Leader replicatedToAllIndex", 5, leader.getReplicatedToAllIndex());
 280
 281         // Verify follower 1 applies the states.
 282         applyStates = MessageCollectorActor.expectMatching(follower1CollectorActor, ApplyState.class, 3);
 283         verifyApplyState(applyStates.get(0), null, null, currentTerm, 4, payload4);
 284         verifyApplyState(applyStates.get(1), null, null, currentTerm, 5, payload5);
 285         verifyApplyState(applyStates.get(2), null, null, currentTerm, 6, payload6);
 286
 287         // Verify follower 1 applies a log entry for at least the last entry index.
 288         verifyApplyJournalEntries(follower1CollectorActor, 6);
 289
 290         // Verify follower 2 applies the states.
 291         applyStates = MessageCollectorActor.expectMatching(follower2CollectorActor, ApplyState.class, 3);
 292         verifyApplyState(applyStates.get(0), null, null, currentTerm, 4, payload4);
 293         verifyApplyState(applyStates.get(1), null, null, currentTerm, 5, payload5);
 294         verifyApplyState(applyStates.get(2), null, null, currentTerm, 6, payload6);
 295
 296         // Verify follower 2 applies a log entry for at least the last entry index.
 297         verifyApplyJournalEntries(follower2CollectorActor, 6);
 298
 299         MessageCollectorActor.clearMessages(leaderCollectorActor);
 300
 301         testLog.info("testSubsequentReplications ending");
 302     }
 303
 304     /**
 305      * Send one more payload to trigger another snapshot. In this scenario, we delay the snapshot until
 306      * consensus occurs and the leader applies the state.
 307      */
 308     private void testSecondSnapshot() throws Exception {
 309         testLog.info("testSecondSnapshot starting");
 310
 311         expSnapshotState.add(payload3);
 312         expSnapshotState.add(payload4);
 313         expSnapshotState.add(payload5);
 314         expSnapshotState.add(payload6);
 315
 316         // Delay the CaptureSnapshot message to the leader actor.
 317         leaderActor.underlyingActor().startDropMessages(CaptureSnapshotReply.class);
 318
 319         // Send the payload.
 320         payload7 = sendPayloadData(leaderActor, "seven");
 321
 322         // Capture the CaptureSnapshotReply message so we can send it later.
 323         final CaptureSnapshotReply captureSnapshotReply = MessageCollectorActor.expectFirstMatching(
 324                 leaderCollectorActor, CaptureSnapshotReply.class);
 325
 326         // Wait for the state to be applied in the leader.
 327         ApplyState applyState = MessageCollectorActor.expectFirstMatching(leaderCollectorActor, ApplyState.class);
 328         verifyApplyState(applyState, leaderCollectorActor, payload7.toString(), currentTerm, 7, payload7);
 329
 330         // At this point the leader has applied the new state but the cached snapshot index should not be
 331         // advanced by a "fake" snapshot because we're in the middle of a snapshot. We'll wait for at least
 332         // one more heartbeat AppendEntriesReply to ensure this does not occur.
 333         MessageCollectorActor.clearMessages(leaderCollectorActor);
 334         MessageCollectorActor.expectFirstMatching(leaderCollectorActor, AppendEntriesReply.class);
 335
 336         assertEquals("Leader snapshot term", currentTerm, leaderContext.getReplicatedLog().getSnapshotTerm());
 337         assertEquals("Leader snapshot index", 5, leaderContext.getReplicatedLog().getSnapshotIndex());
 338         assertEquals("Leader journal log size", 2, leaderContext.getReplicatedLog().size());
 339         assertEquals("Leader journal last index", 7, leaderContext.getReplicatedLog().lastIndex());
 340         assertEquals("Leader commit index", 7, leaderContext.getCommitIndex());
 341         assertEquals("Leader last applied", 7, leaderContext.getLastApplied());
 342         assertEquals("Leader replicatedToAllIndex", 5, leader.getReplicatedToAllIndex());
 343
 344         // Now deliver the CaptureSnapshotReply.
 345         leaderActor.underlyingActor().stopDropMessages(CaptureSnapshotReply.class);
 346         leaderActor.tell(captureSnapshotReply, leaderActor);
 347
 348         // Wait for snapshot complete.
 349         MessageCollectorActor.expectFirstMatching(leaderCollectorActor, SaveSnapshotSuccess.class);
 350
 351         // Wait for another heartbeat AppendEntriesReply. This should cause a "fake" snapshot to advance the
 352         // snapshot index and trimmed the log since we're no longer in a snapshot.
 353         MessageCollectorActor.clearMessages(leaderCollectorActor);
 354         MessageCollectorActor.expectFirstMatching(leaderCollectorActor, AppendEntriesReply.class);
 355         assertEquals("Leader snapshot term", currentTerm, leaderContext.getReplicatedLog().getSnapshotTerm());
 356         assertEquals("Leader snapshot index", 6, leaderContext.getReplicatedLog().getSnapshotIndex());
 357         assertEquals("Leader journal log size", 1, leaderContext.getReplicatedLog().size());
 358         assertEquals("Leader journal last index", 7, leaderContext.getReplicatedLog().lastIndex());
 359         assertEquals("Leader commit index", 7, leaderContext.getCommitIndex());
 360
 361         // Verify the persisted snapshot. This should reflect the snapshot index as the last applied
 362         // log entry (7) and shouldn't contain any unapplied entries as we capture persisted the snapshot data
 363         // when the snapshot is created (ie when the CaptureSnapshot is processed).
 364         List<Snapshot> persistedSnapshots = InMemorySnapshotStore.getSnapshots(leaderId, Snapshot.class);
 365         assertEquals("Persisted snapshots size", 1, persistedSnapshots.size());
 366         verifySnapshot("Persisted", persistedSnapshots.get(0), currentTerm, 6, currentTerm, 7);
 367         List<ReplicatedLogEntry> unAppliedEntry = persistedSnapshots.get(0).getUnAppliedEntries();
 368         assertEquals("Persisted Snapshot getUnAppliedEntries size", 1, unAppliedEntry.size());
 369         verifyReplicatedLogEntry(unAppliedEntry.get(0), currentTerm, 7, payload7);
 370
 371         // The leader's persisted journal log should be cleared since we did a snapshot.
 372         List<SimpleReplicatedLogEntry> persistedLeaderJournal = InMemoryJournal.get(
 373                 leaderId, SimpleReplicatedLogEntry.class);
 374         assertEquals("Persisted journal log size", 0, persistedLeaderJournal.size());
 375
 376         // Verify the followers apply all 4 new log entries.
 377         List<ApplyState> applyStates = MessageCollectorActor.expectMatching(follower1CollectorActor,
 378                 ApplyState.class, 4);
 379         verifyApplyState(applyStates.get(0), null, null, currentTerm, 4, payload4);
 380         verifyApplyState(applyStates.get(1), null, null, currentTerm, 5, payload5);
 381         verifyApplyState(applyStates.get(2), null, null, currentTerm, 6, payload6);
 382         verifyApplyState(applyStates.get(3), null, null, currentTerm, 7, payload7);
 383
 384         applyStates = MessageCollectorActor.expectMatching(follower2CollectorActor, ApplyState.class, 4);
 385         verifyApplyState(applyStates.get(0), null, null, currentTerm, 4, payload4);
 386         verifyApplyState(applyStates.get(1), null, null, currentTerm, 5, payload5);
 387         verifyApplyState(applyStates.get(2), null, null, currentTerm, 6, payload6);
 388         verifyApplyState(applyStates.get(3), null, null, currentTerm, 7, payload7);
 389
 390         // Verify the follower's snapshot index has also advanced. (after another AppendEntries heartbeat
 391         // to be safe).
 392
 393         MessageCollectorActor.clearMessages(follower1CollectorActor);
 394         MessageCollectorActor.expectFirstMatching(follower1CollectorActor, AppendEntries.class);
 395         follower1Context = follower1Actor.underlyingActor().getRaftActorContext();
 396         assertEquals("Follower 1 snapshot term", currentTerm, follower1Context.getReplicatedLog().getSnapshotTerm());
 397         assertEquals("Follower 1 snapshot index", 6, follower1Context.getReplicatedLog().getSnapshotIndex());
 398         assertEquals("Follower 1 journal log size", 1, follower1Context.getReplicatedLog().size());
 399         assertEquals("Follower 1 journal last index", 7, follower1Context.getReplicatedLog().lastIndex());
 400         assertEquals("Follower 1 commit index", 7, follower1Context.getCommitIndex());
 401
 402         MessageCollectorActor.clearMessages(follower2CollectorActor);
 403         MessageCollectorActor.expectFirstMatching(follower2CollectorActor, AppendEntries.class);
 404         follower2Context = follower2Actor.underlyingActor().getRaftActorContext();
 405         assertEquals("Follower 2 snapshot term", currentTerm, follower2Context.getReplicatedLog().getSnapshotTerm());
 406         assertEquals("Follower 2 snapshot index", 6, follower2Context.getReplicatedLog().getSnapshotIndex());
 407         assertEquals("Follower 2 journal log size", 1, follower2Context.getReplicatedLog().size());
 408         assertEquals("Follower 2 journal last index", 7, follower2Context.getReplicatedLog().lastIndex());
 409         assertEquals("Follower 2 commit index", 7, follower2Context.getCommitIndex());
 410
 411         expSnapshotState.add(payload7);
 412
 413         testLog.info("testSecondSnapshot ending");
 414     }
 415
 416     /**
 417      * Kill the leader actor, reinstate it and verify the recovered journal.
 418      */
 419     private void testLeaderReinstatement() {
 420         testLog.info("testLeaderReinstatement starting");
 421
 422         killActor(leaderActor);
 423
 424         leaderActor = newTestRaftActor(leaderId, peerAddresses, leaderConfigParams);
 425
 426         leaderActor.underlyingActor().waitForRecoveryComplete();
 427
 428         leaderContext = leaderActor.underlyingActor().getRaftActorContext();
 429
 430         assertEquals("Leader snapshot term", currentTerm, leaderContext.getReplicatedLog().getSnapshotTerm());
 431         assertEquals("Leader snapshot index", 6, leaderContext.getReplicatedLog().getSnapshotIndex());
 432         assertEquals("Leader journal log size", 1, leaderContext.getReplicatedLog().size());
 433         assertEquals("Leader journal last index", 7, leaderContext.getReplicatedLog().lastIndex());
 434         assertEquals("Leader commit index", 7, leaderContext.getCommitIndex());
 435         assertEquals("Leader last applied", 7, leaderContext.getLastApplied());
 436         verifyReplicatedLogEntry(leaderContext.getReplicatedLog().last(), currentTerm, 7, payload7);
 437
 438         testLog.info("testLeaderReinstatement ending");
 439     }
 440 }