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 import akka.persistence.SaveSnapshotSuccess;
  12 import com.google.common.collect.ImmutableMap;
  13 import java.util.List;
  14 import org.junit.Test;
  15 import org.opendaylight.controller.cluster.raft.MockRaftActorContext.MockPayload;
  16 import org.opendaylight.controller.cluster.raft.RaftActor.UpdateElectionTerm;
  17 import org.opendaylight.controller.cluster.raft.base.messages.ApplyLogEntries;
  18 import org.opendaylight.controller.cluster.raft.base.messages.ApplyState;
  19 import org.opendaylight.controller.cluster.raft.base.messages.CaptureSnapshot;
  20 import org.opendaylight.controller.cluster.raft.base.messages.CaptureSnapshotReply;
  21 import org.opendaylight.controller.cluster.raft.messages.AppendEntries;
  22 import org.opendaylight.controller.cluster.raft.messages.AppendEntriesReply;
  23 import org.opendaylight.controller.cluster.raft.utils.InMemoryJournal;
  24 import org.opendaylight.controller.cluster.raft.utils.InMemorySnapshotStore;
  25 import org.opendaylight.controller.cluster.raft.utils.MessageCollectorActor;
  26
  27 /**
  28  * Tests replication and snapshots end-to-end using real RaftActors and behavior communication.
  29  *
  30  * @author Thomas Pantelis
  31  */
  32 public class ReplicationAndSnapshotsIntegrationTest extends AbstractRaftActorIntegrationTest {
  33
  34     private List<ReplicatedLogImplEntry> origLeaderJournal;
  35
  36     private MockPayload recoveredPayload0;
  37     private MockPayload recoveredPayload1;
  38     private MockPayload recoveredPayload2;
  39     private MockPayload payload4;
  40     private MockPayload payload5;
  41     private MockPayload payload6;
  42     private MockPayload payload7;
  43
  44     @Test
  45     public void runTest() {
  46         testLog.info("testReplicationAndSnapshots starting");
  47
  48         // Setup the persistent journal for the leader. We'll start up with 3 journal log entries (one less
  49         // than the snapshotBatchCount).
  50         long seqId = 1;
  51         InMemoryJournal.addEntry(leaderId, seqId++, new UpdateElectionTerm(initialTerm, leaderId));
  52         recoveredPayload0 = new MockPayload("zero");
  53         InMemoryJournal.addEntry(leaderId, seqId++, new ReplicatedLogImplEntry(0, initialTerm, recoveredPayload0));
  54         recoveredPayload1 = new MockPayload("one");
  55         InMemoryJournal.addEntry(leaderId, seqId++, new ReplicatedLogImplEntry(1, initialTerm, recoveredPayload1));
  56         recoveredPayload2 = new MockPayload("two");
  57         InMemoryJournal.addEntry(leaderId, seqId++, new ReplicatedLogImplEntry(2, initialTerm, recoveredPayload2));
  58         InMemoryJournal.addEntry(leaderId, seqId++, new ApplyLogEntries(2));
  59
  60         origLeaderJournal = InMemoryJournal.get(leaderId, ReplicatedLogImplEntry.class);
  61
  62         // Create the leader and 2 follower actors and verify initial syncing of the followers after leader
  63         // persistence recovery.
  64
  65         follower1Actor = newTestRaftActor(follower1Id, ImmutableMap.of(leaderId, testActorPath(leaderId),
  66                 follower2Id, testActorPath(follower2Id)), newFollowerConfigParams());
  67
  68         follower2Actor = newTestRaftActor(follower2Id, ImmutableMap.of(leaderId, testActorPath(leaderId),
  69                 follower1Id, testActorPath(follower1Id)), newFollowerConfigParams());
  70
  71         peerAddresses = ImmutableMap.<String, String>builder().
  72                 put(follower1Id, follower1Actor.path().toString()).
  73                 put(follower2Id, follower2Actor.path().toString()).build();
  74
  75         leaderConfigParams = newLeaderConfigParams();
  76         leaderActor = newTestRaftActor(leaderId, peerAddresses, leaderConfigParams);
  77
  78         follower1CollectorActor = follower1Actor.underlyingActor().collectorActor();
  79         follower2CollectorActor = follower2Actor.underlyingActor().collectorActor();
  80         leaderCollectorActor = leaderActor.underlyingActor().collectorActor();
  81
  82         leaderContext = leaderActor.underlyingActor().getRaftActorContext();
  83
  84         verifyLeaderRecoveryAndInitialization();
  85
  86         testFirstSnapshot();
  87
  88         testSubsequentReplications();
  89
  90         testSecondSnapshot();
  91
  92         testLeaderReinstatement();
  93
  94         testLog.info("testReplicationAndSnapshots ending");
  95     }
  96
  97     /**
  98      * Verify the expected leader is elected as the leader and verify initial syncing of the followers
  99      * from the leader's persistence recovery.
 100      */
 101     void verifyLeaderRecoveryAndInitialization() {
 102         testLog.info("verifyLeaderRecoveryAndInitialization starting");
 103
 104         waitUntilLeader(leaderActor);
 105
 106         currentTerm = leaderContext.getTermInformation().getCurrentTerm();
 107         assertEquals("Current term > " + initialTerm, true, currentTerm > initialTerm);
 108
 109         leader = leaderActor.underlyingActor().getCurrentBehavior();
 110
 111         // The followers should receive AppendEntries for each leader log entry that was recovered from
 112         // persistence and apply each one.
 113         List<ApplyState> applyStates = MessageCollectorActor.expectMatching(
 114                 follower1CollectorActor, ApplyState.class, 3);
 115         verifyApplyState(applyStates.get(0), null, null, initialTerm, 0, recoveredPayload0);
 116         verifyApplyState(applyStates.get(1), null, null, initialTerm, 1, recoveredPayload1);
 117         verifyApplyState(applyStates.get(2), null, null, initialTerm, 2, recoveredPayload2);
 118
 119         // Verify follower 1 applies a log entry for at least the last entry index.
 120         verifyApplyJournalEntries(follower1CollectorActor, 2);
 121
 122         applyStates = MessageCollectorActor.expectMatching(follower2CollectorActor, ApplyState.class, 3);
 123         verifyApplyState(applyStates.get(0), null, null, initialTerm, 0, recoveredPayload0);
 124         verifyApplyState(applyStates.get(1), null, null, initialTerm, 1, recoveredPayload1);
 125         verifyApplyState(applyStates.get(2), null, null, initialTerm, 2, recoveredPayload2);
 126
 127         // Verify follower 1]2 applies a log entry for at least the last entry index.
 128         verifyApplyJournalEntries(follower2CollectorActor, 2);
 129
 130         MessageCollectorActor.clearMessages(leaderCollectorActor);
 131         MessageCollectorActor.clearMessages(follower1CollectorActor);
 132         MessageCollectorActor.clearMessages(follower2CollectorActor);
 133
 134         // The leader should have performed fake snapshots due to the follower's AppendEntriesReplies and
 135         // trimmed the in-memory log so that only the last entry remains.
 136         assertEquals("Leader snapshot term", initialTerm, leaderContext.getReplicatedLog().getSnapshotTerm());
 137         assertEquals("Leader snapshot index", 1, leaderContext.getReplicatedLog().getSnapshotIndex());
 138         assertEquals("Leader journal log size", 1, leaderContext.getReplicatedLog().size());
 139         assertEquals("Leader journal last index", 2, leaderContext.getReplicatedLog().lastIndex());
 140         assertEquals("Leader commit index", 2, leaderContext.getCommitIndex());
 141         assertEquals("Leader last applied", 2, leaderContext.getLastApplied());
 142         assertEquals("Leader replicatedToAllIndex", 1, leader.getReplicatedToAllIndex());
 143
 144         // Verify the follower's persisted journal log.
 145         verifyPersistedJournal(follower1Id, origLeaderJournal);
 146         verifyPersistedJournal(follower2Id, origLeaderJournal);
 147
 148         MessageCollectorActor.clearMessages(leaderCollectorActor);
 149         MessageCollectorActor.clearMessages(follower1CollectorActor);
 150         MessageCollectorActor.clearMessages(follower2CollectorActor);
 151
 152         testLog.info("verifyLeaderRecoveryAndInitialization ending");
 153     }
 154
 155     /**
 156      * Send a payload to the TestRaftActor to persist and replicate. Since snapshotBatchCount is set to
 157      * 4 and we already have 3 entries in the journal log, this should initiate a snapshot. In this
 158      * scenario, the follower consensus and application of state is delayed until after the snapshot
 159      * completes.
 160      */
 161     private void testFirstSnapshot() {
 162         testLog.info("testFirstSnapshot starting");
 163
 164         byte[] snapshot = new byte[] {1,2,3,4};
 165         leaderActor.underlyingActor().setSnapshot(snapshot);
 166
 167         // Delay the consensus by temporarily dropping the AppendEntries to both followers.
 168         follower1Actor.underlyingActor().startDropMessages(AppendEntries.class);
 169         follower2Actor.underlyingActor().startDropMessages(AppendEntries.class);
 170
 171         // Send the payload.
 172         MockPayload payload3 = sendPayloadData(leaderActor, "three");
 173
 174         // Wait for snapshot complete.
 175         MessageCollectorActor.expectFirstMatching(leaderCollectorActor, SaveSnapshotSuccess.class);
 176
 177         // The snapshot index should not be advanced nor the log trimmed because replicatedToAllIndex
 178         // is behind due the followers not being replicated yet via AppendEntries.
 179         assertEquals("Leader snapshot term", initialTerm, leaderContext.getReplicatedLog().getSnapshotTerm());
 180         assertEquals("Leader snapshot index", 1, leaderContext.getReplicatedLog().getSnapshotIndex());
 181         assertEquals("Leader journal log size", 2, leaderContext.getReplicatedLog().size());
 182         assertEquals("Leader journal last index", 3, leaderContext.getReplicatedLog().lastIndex());
 183
 184         // Verify the persisted snapshot in the leader. This should reflect the advanced snapshot index as
 185         // the last applied log entry (2) even though the leader hasn't yet advanced its cached snapshot index.
 186         List<Snapshot> persistedSnapshots = InMemorySnapshotStore.getSnapshots(leaderId, Snapshot.class);
 187         assertEquals("Persisted snapshots size", 1, persistedSnapshots.size());
 188         verifySnapshot("Persisted", persistedSnapshots.get(0), initialTerm, 2, currentTerm, 3, snapshot);
 189         List<ReplicatedLogEntry> unAppliedEntry = persistedSnapshots.get(0).getUnAppliedEntries();
 190         assertEquals("Persisted Snapshot getUnAppliedEntries size", 1, unAppliedEntry.size());
 191         verifyReplicatedLogEntry(unAppliedEntry.get(0), currentTerm, 3, payload3);
 192
 193         // The leader's persisted journal log should be cleared since we snapshotted.
 194         List<ReplicatedLogImplEntry> persistedLeaderJournal = InMemoryJournal.get(leaderId, ReplicatedLogImplEntry.class);
 195         assertEquals("Persisted journal log size", 0, persistedLeaderJournal.size());
 196
 197         // Allow AppendEntries to both followers to proceed. This should catch up the followers and cause a
 198         // "fake" snapshot in the leader to advance the snapshot index to 2. Also the state should be applied
 199         // in all members (via ApplyState).
 200         follower1Actor.underlyingActor().stopDropMessages(AppendEntries.class);
 201         follower2Actor.underlyingActor().stopDropMessages(AppendEntries.class);
 202
 203         ApplyState applyState = MessageCollectorActor.expectFirstMatching(leaderCollectorActor, ApplyState.class);
 204         verifyApplyState(applyState, leaderCollectorActor, payload3.toString(), currentTerm, 3, payload3);
 205
 206         verifyApplyJournalEntries(leaderCollectorActor, 3);
 207
 208         assertEquals("Leader commit index", 3, leaderContext.getCommitIndex());
 209
 210         applyState = MessageCollectorActor.expectFirstMatching(follower1CollectorActor, ApplyState.class);
 211         verifyApplyState(applyState, null, null, currentTerm, 3, payload3);
 212
 213         verifyApplyJournalEntries(follower1CollectorActor, 3);
 214
 215         applyState = MessageCollectorActor.expectFirstMatching(follower2CollectorActor, ApplyState.class);
 216         verifyApplyState(applyState, null, null, currentTerm, 3, payload3);
 217
 218         verifyApplyJournalEntries(follower2CollectorActor, 3);
 219
 220         assertEquals("Leader snapshot term", initialTerm, leaderContext.getReplicatedLog().getSnapshotTerm());
 221         assertEquals("Leader snapshot index", 2, leaderContext.getReplicatedLog().getSnapshotIndex());
 222         assertEquals("Leader journal log size", 1, leaderContext.getReplicatedLog().size());
 223         assertEquals("Leader commit index", 3, leaderContext.getCommitIndex());
 224         assertEquals("Leader last applied", 3, leaderContext.getLastApplied());
 225         assertEquals("Leader replicatedToAllIndex", 2, leader.getReplicatedToAllIndex());
 226
 227         MessageCollectorActor.clearMessages(leaderCollectorActor);
 228         MessageCollectorActor.clearMessages(follower1CollectorActor);
 229         MessageCollectorActor.clearMessages(follower2CollectorActor);
 230
 231         testLog.info("testFirstSnapshot ending");
 232     }
 233
 234     /**
 235      * Send 3 more payload instances and verify they get applied by all members.
 236      */
 237     private void testSubsequentReplications() {
 238         testLog.info("testSubsequentReplications starting");
 239
 240         payload4 = sendPayloadData(leaderActor, "four");
 241         payload5 = sendPayloadData(leaderActor, "five");
 242         payload6 = sendPayloadData(leaderActor, "six");
 243
 244         // Verify the leader applies the states.
 245         List<ApplyState> applyStates = MessageCollectorActor.expectMatching(leaderCollectorActor, ApplyState.class, 3);
 246         verifyApplyState(applyStates.get(0), leaderCollectorActor, payload4.toString(), currentTerm, 4, payload4);
 247         verifyApplyState(applyStates.get(1), leaderCollectorActor, payload5.toString(), currentTerm, 5, payload5);
 248         verifyApplyState(applyStates.get(2), leaderCollectorActor, payload6.toString(), currentTerm, 6, payload6);
 249
 250         // Verify the leader applies a log entry for at least the last entry index.
 251         verifyApplyJournalEntries(leaderCollectorActor, 6);
 252
 253         // The leader should have performed fake snapshots due to the follower's AppendEntriesReplies and
 254         // trimmed the in-memory log so that only the last entry remains.
 255         assertEquals("Leader snapshot term", currentTerm, leaderContext.getReplicatedLog().getSnapshotTerm());
 256         assertEquals("Leader snapshot index", 5, leaderContext.getReplicatedLog().getSnapshotIndex());
 257         assertEquals("Leader journal log size", 1, leaderContext.getReplicatedLog().size());
 258         assertEquals("Leader journal last index", 6, leaderContext.getReplicatedLog().lastIndex());
 259         assertEquals("Leader commit index", 6, leaderContext.getCommitIndex());
 260         assertEquals("Leader last applied", 6, leaderContext.getLastApplied());
 261         assertEquals("Leader replicatedToAllIndex", 5, leader.getReplicatedToAllIndex());
 262
 263         // Verify follower 1 applies the states.
 264         applyStates = MessageCollectorActor.expectMatching(follower1CollectorActor, ApplyState.class, 3);
 265         verifyApplyState(applyStates.get(0), null, null, currentTerm, 4, payload4);
 266         verifyApplyState(applyStates.get(1), null, null, currentTerm, 5, payload5);
 267         verifyApplyState(applyStates.get(2), null, null, currentTerm, 6, payload6);
 268
 269         // Verify follower 1 applies a log entry for at least the last entry index.
 270         verifyApplyJournalEntries(follower1CollectorActor, 6);
 271
 272         // Verify follower 2 applies the states.
 273         applyStates = MessageCollectorActor.expectMatching(follower2CollectorActor, ApplyState.class, 3);
 274         verifyApplyState(applyStates.get(0), null, null, currentTerm, 4, payload4);
 275         verifyApplyState(applyStates.get(1), null, null, currentTerm, 5, payload5);
 276         verifyApplyState(applyStates.get(2), null, null, currentTerm, 6, payload6);
 277
 278         // Verify follower 2 applies a log entry for at least the last entry index.
 279         verifyApplyJournalEntries(follower2CollectorActor, 6);
 280
 281         MessageCollectorActor.clearMessages(leaderCollectorActor);
 282
 283         testLog.info("testSubsequentReplications ending");
 284     }
 285
 286     /**
 287      * Send one more payload to trigger another snapshot. In this scenario, we delay the snapshot until
 288      * consensus occurs and the leader applies the state.
 289      */
 290     private void testSecondSnapshot() {
 291         testLog.info("testSecondSnapshot starting");
 292
 293         byte[] snapshot = new byte[] {5,6,7,8};
 294         leaderActor.underlyingActor().setSnapshot(snapshot);
 295
 296         // Delay the CaptureSnapshot message to the leader actor.
 297         leaderActor.underlyingActor().startDropMessages(CaptureSnapshot.class);
 298
 299         // Send the payload.
 300         payload7 = sendPayloadData(leaderActor, "seven");
 301
 302         // Capture the CaptureSnapshot message so we can send it later.
 303         CaptureSnapshot captureSnapshot = MessageCollectorActor.expectFirstMatching(
 304                 leaderCollectorActor, CaptureSnapshot.class);
 305
 306         // Wait for the state to be applied in the leader.
 307         ApplyState applyState = MessageCollectorActor.expectFirstMatching(leaderCollectorActor, ApplyState.class);
 308         verifyApplyState(applyState, leaderCollectorActor, payload7.toString(), currentTerm, 7, payload7);
 309
 310         // At this point the leader has applied the new state but the cached snapshot index should not be
 311         // advanced by a "fake" snapshot because we're in the middle of a snapshot. We'll wait for at least
 312         // one more heartbeat AppendEntriesReply to ensure this does not occur.
 313         MessageCollectorActor.clearMessages(leaderCollectorActor);
 314         MessageCollectorActor.expectFirstMatching(leaderCollectorActor, AppendEntriesReply.class);
 315
 316         assertEquals("Leader snapshot term", currentTerm, leaderContext.getReplicatedLog().getSnapshotTerm());
 317         assertEquals("Leader snapshot index", 5, leaderContext.getReplicatedLog().getSnapshotIndex());
 318         assertEquals("Leader journal log size", 2, leaderContext.getReplicatedLog().size());
 319         assertEquals("Leader journal last index", 7, leaderContext.getReplicatedLog().lastIndex());
 320         assertEquals("Leader commit index", 7, leaderContext.getCommitIndex());
 321         assertEquals("Leader last applied", 7, leaderContext.getLastApplied());
 322         assertEquals("Leader replicatedToAllIndex", 5, leader.getReplicatedToAllIndex());
 323
 324         // Now deliver the CaptureSnapshot.
 325         leaderActor.underlyingActor().stopDropMessages(CaptureSnapshot.class);
 326         leaderActor.tell(captureSnapshot, leaderActor);
 327
 328         // Wait for CaptureSnapshotReply to complete.
 329         MessageCollectorActor.expectFirstMatching(leaderCollectorActor, CaptureSnapshotReply.class);
 330
 331         // Wait for snapshot complete.
 332         MessageCollectorActor.expectFirstMatching(leaderCollectorActor, SaveSnapshotSuccess.class);
 333
 334         // Wait for another heartbeat AppendEntriesReply. This should cause a "fake" snapshot to advance the
 335         // snapshot index and trimmed the log since we're no longer in a snapshot.
 336         MessageCollectorActor.clearMessages(leaderCollectorActor);
 337         MessageCollectorActor.expectFirstMatching(leaderCollectorActor, AppendEntriesReply.class);
 338         assertEquals("Leader snapshot term", currentTerm, leaderContext.getReplicatedLog().getSnapshotTerm());
 339         assertEquals("Leader snapshot index", 6, leaderContext.getReplicatedLog().getSnapshotIndex());
 340         assertEquals("Leader journal log size", 1, leaderContext.getReplicatedLog().size());
 341         assertEquals("Leader journal last index", 7, leaderContext.getReplicatedLog().lastIndex());
 342         assertEquals("Leader commit index", 7, leaderContext.getCommitIndex());
 343
 344         // Verify the persisted snapshot. This should reflect the advanced snapshot index as the last applied
 345         // log entry (6).
 346         List<Snapshot> persistedSnapshots = InMemorySnapshotStore.getSnapshots(leaderId, Snapshot.class);
 347         assertEquals("Persisted snapshots size", 1, persistedSnapshots.size());
 348         verifySnapshot("Persisted", persistedSnapshots.get(0), currentTerm, 6, currentTerm, 7, snapshot);
 349         List<ReplicatedLogEntry> unAppliedEntry = persistedSnapshots.get(0).getUnAppliedEntries();
 350         assertEquals("Persisted Snapshot getUnAppliedEntries size", 1, unAppliedEntry.size());
 351         verifyReplicatedLogEntry(unAppliedEntry.get(0), currentTerm, 7, payload7);
 352
 353         // The leader's persisted journal log should be cleared since we did a snapshot.
 354         List<ReplicatedLogImplEntry> persistedLeaderJournal = InMemoryJournal.get(
 355                 leaderId, ReplicatedLogImplEntry.class);
 356         assertEquals("Persisted journal log size", 0, persistedLeaderJournal.size());
 357
 358         // Verify the followers apply all 4 new log entries.
 359         List<ApplyState> applyStates = MessageCollectorActor.expectMatching(follower1CollectorActor, ApplyState.class, 4);
 360         verifyApplyState(applyStates.get(0), null, null, currentTerm, 4, payload4);
 361         verifyApplyState(applyStates.get(1), null, null, currentTerm, 5, payload5);
 362         verifyApplyState(applyStates.get(2), null, null, currentTerm, 6, payload6);
 363         verifyApplyState(applyStates.get(3), null, null, currentTerm, 7, payload7);
 364
 365         applyStates = MessageCollectorActor.expectMatching(follower2CollectorActor, ApplyState.class, 4);
 366         verifyApplyState(applyStates.get(0), null, null, currentTerm, 4, payload4);
 367         verifyApplyState(applyStates.get(1), null, null, currentTerm, 5, payload5);
 368         verifyApplyState(applyStates.get(2), null, null, currentTerm, 6, payload6);
 369         verifyApplyState(applyStates.get(3), null, null, currentTerm, 7, payload7);
 370
 371         // Verify the follower's snapshot index has also advanced. (after another AppendEntries heartbeat
 372         // to be safe).
 373
 374         MessageCollectorActor.clearMessages(follower1CollectorActor);
 375         MessageCollectorActor.expectFirstMatching(follower1CollectorActor, AppendEntries.class);
 376         RaftActorContext follower1Context = follower1Actor.underlyingActor().getRaftActorContext();
 377         assertEquals("Follower 1 snapshot term", currentTerm, follower1Context.getReplicatedLog().getSnapshotTerm());
 378         assertEquals("Follower 1 snapshot index", 6, follower1Context.getReplicatedLog().getSnapshotIndex());
 379         assertEquals("Follower 1 journal log size", 1, follower1Context.getReplicatedLog().size());
 380         assertEquals("Follower 1 journal last index", 7, follower1Context.getReplicatedLog().lastIndex());
 381         assertEquals("Follower 1 commit index", 7, follower1Context.getCommitIndex());
 382
 383         MessageCollectorActor.clearMessages(follower2CollectorActor);
 384         MessageCollectorActor.expectFirstMatching(follower2CollectorActor, AppendEntries.class);
 385         RaftActorContext follower2Context = follower2Actor.underlyingActor().getRaftActorContext();
 386         assertEquals("Follower 2 snapshot term", currentTerm, follower2Context.getReplicatedLog().getSnapshotTerm());
 387         assertEquals("Follower 2 snapshot index", 6, follower2Context.getReplicatedLog().getSnapshotIndex());
 388         assertEquals("Follower 2 journal log size", 1, follower2Context.getReplicatedLog().size());
 389         assertEquals("Follower 2 journal last index", 7, follower2Context.getReplicatedLog().lastIndex());
 390         assertEquals("Follower 2 commit index", 7, follower2Context.getCommitIndex());
 391
 392         testLog.info("testSecondSnapshot ending");
 393     }
 394
 395     /**
 396      * Kill the leader actor, reinstate it and verify the recovered journal.
 397      */
 398     private void testLeaderReinstatement() {
 399         testLog.info("testLeaderReinstatement starting");
 400
 401         killActor(leaderActor);
 402
 403         leaderActor = newTestRaftActor(leaderId, peerAddresses, leaderConfigParams);
 404
 405         leaderActor.underlyingActor().waitForRecoveryComplete();
 406
 407         assertEquals("Leader snapshot term", currentTerm, leaderContext.getReplicatedLog().getSnapshotTerm());
 408         assertEquals("Leader snapshot index", 6, leaderContext.getReplicatedLog().getSnapshotIndex());
 409         assertEquals("Leader journal log size", 1, leaderContext.getReplicatedLog().size());
 410         assertEquals("Leader journal last index", 7, leaderContext.getReplicatedLog().lastIndex());
 411         assertEquals("Leader commit index", 7, leaderContext.getCommitIndex());
 412         assertEquals("Leader last applied", 7, leaderContext.getLastApplied());
 413         verifyReplicatedLogEntry(leaderContext.getReplicatedLog().last(), currentTerm, 7, payload7);
 414
 415         testLog.info("testLeaderReinstatement ending");
 416     }
 417 }