public class LeaderTest extends AbstractLeaderTest {
static final String FOLLOWER_ID = "follower";
+ public static final String LEADER_ID = "leader";
private final TestActorRef<ForwardMessageToBehaviorActor> leaderActor = actorFactory.createTestActor(
Props.create(ForwardMessageToBehaviorActor.class), actorFactory.generateActorId("leader"));
assertEquals("Entry getTerm", term, appendEntries.getEntries().get(0).getTerm());
}
+
+ private RaftActorBehavior sendReplicate(MockRaftActorContext actorContext, long index){
+ MockRaftActorContext.MockPayload payload = new MockRaftActorContext.MockPayload("foo");
+ MockRaftActorContext.MockReplicatedLogEntry newEntry = new MockRaftActorContext.MockReplicatedLogEntry(
+ 1, index, payload);
+ actorContext.getReplicatedLog().append(newEntry);
+ return leader.handleMessage(leaderActor, new Replicate(null, null, newEntry));
+ }
+
@Test
public void testHandleReplicateMessageSendAppendEntriesToFollower() throws Exception {
logStart("testHandleReplicateMessageSendAppendEntriesToFollower");
MockRaftActorContext.MockReplicatedLogEntry newEntry = new MockRaftActorContext.MockReplicatedLogEntry(
1, lastIndex + 1, payload);
actorContext.getReplicatedLog().append(newEntry);
- RaftActorBehavior raftBehavior = leader.handleMessage(leaderActor,
- new Replicate(null, null, newEntry));
+ RaftActorBehavior raftBehavior = sendReplicate(actorContext, lastIndex+1);
// State should not change
assertTrue(raftBehavior instanceof Leader);
assertEquals("Entry payload", payload, appendEntries.getEntries().get(0).getData());
}
+ @Test
+ public void testMultipleReplicateShouldNotCauseDuplicateAppendEntriesToBeSent() throws Exception {
+ logStart("testHandleReplicateMessageSendAppendEntriesToFollower");
+
+ MockRaftActorContext actorContext = createActorContextWithFollower();
+ actorContext.setConfigParams(new DefaultConfigParamsImpl() {
+ @Override
+ public FiniteDuration getHeartBeatInterval() {
+ return FiniteDuration.apply(5, TimeUnit.SECONDS);
+ }
+ });
+
+ long term = 1;
+ actorContext.getTermInformation().update(term, "");
+
+ leader = new Leader(actorContext);
+
+ // Leader will send an immediate heartbeat - ignore it.
+ MessageCollectorActor.expectFirstMatching(followerActor, AppendEntries.class);
+
+ // The follower would normally reply - simulate that explicitly here.
+ long lastIndex = actorContext.getReplicatedLog().lastIndex();
+ leader.handleMessage(followerActor, new AppendEntriesReply(
+ FOLLOWER_ID, term, true, lastIndex, term));
+ assertEquals("isFollowerActive", true, leader.getFollower(FOLLOWER_ID).isFollowerActive());
+
+ followerActor.underlyingActor().clear();
+
+ for(int i=0;i<5;i++) {
+ sendReplicate(actorContext, lastIndex+i+1);
+ }
+
+ List<AppendEntries> allMessages = MessageCollectorActor.getAllMatching(followerActor, AppendEntries.class);
+ // We expect only 1 message to be sent because of two reasons,
+ // - an append entries reply was not received
+ // - the heartbeat interval has not expired
+ // In this scenario if multiple messages are sent they would likely be duplicates
+ assertEquals("The number of append entries collected should be 1", 1, allMessages.size());
+ }
+
+ @Test
+ public void testMultipleReplicateWithReplyShouldResultInAppendEntries() throws Exception {
+ logStart("testMultipleReplicateWithReplyShouldResultInAppendEntries");
+
+ MockRaftActorContext actorContext = createActorContextWithFollower();
+ actorContext.setConfigParams(new DefaultConfigParamsImpl() {
+ @Override
+ public FiniteDuration getHeartBeatInterval() {
+ return FiniteDuration.apply(5, TimeUnit.SECONDS);
+ }
+ });
+
+ long term = 1;
+ actorContext.getTermInformation().update(term, "");
+
+ leader = new Leader(actorContext);
+
+ // Leader will send an immediate heartbeat - ignore it.
+ MessageCollectorActor.expectFirstMatching(followerActor, AppendEntries.class);
+
+ // The follower would normally reply - simulate that explicitly here.
+ long lastIndex = actorContext.getReplicatedLog().lastIndex();
+ leader.handleMessage(followerActor, new AppendEntriesReply(
+ FOLLOWER_ID, term, true, lastIndex, term));
+ assertEquals("isFollowerActive", true, leader.getFollower(FOLLOWER_ID).isFollowerActive());
+
+ followerActor.underlyingActor().clear();
+
+ for(int i=0;i<3;i++) {
+ sendReplicate(actorContext, lastIndex+i+1);
+ leader.handleMessage(followerActor, new AppendEntriesReply(
+ FOLLOWER_ID, term, true, lastIndex + i + 1, term));
+
+ }
+
+ for(int i=3;i<5;i++) {
+ sendReplicate(actorContext, lastIndex + i + 1);
+ }
+
+ List<AppendEntries> allMessages = MessageCollectorActor.getAllMatching(followerActor, AppendEntries.class);
+ // We expect 4 here because the first 3 replicate got a reply and so the 4th entry would
+ // get sent to the follower - but not the 5th
+ assertEquals("The number of append entries collected should be 4", 4, allMessages.size());
+
+ for(int i=0;i<4;i++) {
+ long expected = allMessages.get(i).getEntries().get(0).getIndex();
+ assertEquals(expected, i+2);
+ }
+ }
+
+ @Test
+ public void testDuplicateAppendEntriesWillBeSentOnHeartBeat() throws Exception {
+ logStart("testDuplicateAppendEntriesWillBeSentOnHeartBeat");
+
+ MockRaftActorContext actorContext = createActorContextWithFollower();
+ actorContext.setConfigParams(new DefaultConfigParamsImpl() {
+ @Override
+ public FiniteDuration getHeartBeatInterval() {
+ return FiniteDuration.apply(500, TimeUnit.MILLISECONDS);
+ }
+ });
+
+ long term = 1;
+ actorContext.getTermInformation().update(term, "");
+
+ leader = new Leader(actorContext);
+
+ // Leader will send an immediate heartbeat - ignore it.
+ MessageCollectorActor.expectFirstMatching(followerActor, AppendEntries.class);
+
+ // The follower would normally reply - simulate that explicitly here.
+ long lastIndex = actorContext.getReplicatedLog().lastIndex();
+ leader.handleMessage(followerActor, new AppendEntriesReply(
+ FOLLOWER_ID, term, true, lastIndex, term));
+ assertEquals("isFollowerActive", true, leader.getFollower(FOLLOWER_ID).isFollowerActive());
+
+ followerActor.underlyingActor().clear();
+
+ sendReplicate(actorContext, lastIndex+1);
+
+ // Wait slightly longer than heartbeat duration
+ Uninterruptibles.sleepUninterruptibly(750, TimeUnit.MILLISECONDS);
+
+ leader.handleMessage(leaderActor, new SendHeartBeat());
+
+ List<AppendEntries> allMessages = MessageCollectorActor.getAllMatching(followerActor, AppendEntries.class);
+ assertEquals("The number of append entries collected should be 2", 2, allMessages.size());
+
+ assertEquals(1, allMessages.get(0).getEntries().size());
+ assertEquals(lastIndex+1, allMessages.get(0).getEntries().get(0).getIndex());
+ assertEquals(1, allMessages.get(1).getEntries().size());
+ assertEquals(lastIndex+1, allMessages.get(0).getEntries().get(0).getIndex());
+
+ }
+
+ @Test
+ public void testHeartbeatsAreAlwaysSentIfTheHeartbeatIntervalHasElapsed() throws Exception {
+ logStart("testHeartbeatsAreAlwaysSentIfTheHeartbeatIntervalHasElapsed");
+
+ MockRaftActorContext actorContext = createActorContextWithFollower();
+ actorContext.setConfigParams(new DefaultConfigParamsImpl() {
+ @Override
+ public FiniteDuration getHeartBeatInterval() {
+ return FiniteDuration.apply(100, TimeUnit.MILLISECONDS);
+ }
+ });
+
+ long term = 1;
+ actorContext.getTermInformation().update(term, "");
+
+ leader = new Leader(actorContext);
+
+ // Leader will send an immediate heartbeat - ignore it.
+ MessageCollectorActor.expectFirstMatching(followerActor, AppendEntries.class);
+
+ // The follower would normally reply - simulate that explicitly here.
+ long lastIndex = actorContext.getReplicatedLog().lastIndex();
+ leader.handleMessage(followerActor, new AppendEntriesReply(
+ FOLLOWER_ID, term, true, lastIndex, term));
+ assertEquals("isFollowerActive", true, leader.getFollower(FOLLOWER_ID).isFollowerActive());
+
+ followerActor.underlyingActor().clear();
+
+ for(int i=0;i<3;i++) {
+ Uninterruptibles.sleepUninterruptibly(150, TimeUnit.MILLISECONDS);
+ leader.handleMessage(leaderActor, new SendHeartBeat());
+ }
+
+ List<AppendEntries> allMessages = MessageCollectorActor.getAllMatching(followerActor, AppendEntries.class);
+ assertEquals("The number of append entries collected should be 3", 3, allMessages.size());
+ }
+
+ @Test
+ public void testSendingReplicateImmediatelyAfterHeartbeatDoesReplicate() throws Exception {
+ logStart("testSendingReplicateImmediatelyAfterHeartbeatDoesReplicate");
+
+ MockRaftActorContext actorContext = createActorContextWithFollower();
+ actorContext.setConfigParams(new DefaultConfigParamsImpl() {
+ @Override
+ public FiniteDuration getHeartBeatInterval() {
+ return FiniteDuration.apply(100, TimeUnit.MILLISECONDS);
+ }
+ });
+
+ long term = 1;
+ actorContext.getTermInformation().update(term, "");
+
+ leader = new Leader(actorContext);
+
+ // Leader will send an immediate heartbeat - ignore it.
+ MessageCollectorActor.expectFirstMatching(followerActor, AppendEntries.class);
+
+ // The follower would normally reply - simulate that explicitly here.
+ long lastIndex = actorContext.getReplicatedLog().lastIndex();
+ leader.handleMessage(followerActor, new AppendEntriesReply(
+ FOLLOWER_ID, term, true, lastIndex, term));
+ assertEquals("isFollowerActive", true, leader.getFollower(FOLLOWER_ID).isFollowerActive());
+
+ followerActor.underlyingActor().clear();
+
+ Uninterruptibles.sleepUninterruptibly(150, TimeUnit.MILLISECONDS);
+ leader.handleMessage(leaderActor, new SendHeartBeat());
+ sendReplicate(actorContext, lastIndex+1);
+
+ List<AppendEntries> allMessages = MessageCollectorActor.getAllMatching(followerActor, AppendEntries.class);
+ assertEquals("The number of append entries collected should be 2", 2, allMessages.size());
+
+ assertEquals(0, allMessages.get(0).getEntries().size());
+ assertEquals(1, allMessages.get(1).getEntries().size());
+ }
+
+
@Test
public void testHandleReplicateMessageWhenThereAreNoFollowers() throws Exception {
logStart("testHandleReplicateMessageWhenThereAreNoFollowers");
new ReplicatedLogImplEntry(newEntryIndex, currentTerm,
new MockRaftActorContext.MockPayload("D"));
+ actorContext.getReplicatedLog().append(entry);
+
//update follower timestamp
leader.markFollowerActive(FOLLOWER_ID);
assertTrue(raftBehavior instanceof Leader);
- MessageCollectorActor.expectFirstMatching(leaderActor, CaptureSnapshot.class);
+ assertEquals("isCapturing", true, actorContext.getSnapshotManager().isCapturing());
}
@Test
leader.handleMessage(leaderActor, new Replicate(null, "state-id", entry));
- CaptureSnapshot cs = MessageCollectorActor.expectFirstMatching(leaderActor, CaptureSnapshot.class);
+ assertEquals("isCapturing", true, actorContext.getSnapshotManager().isCapturing());
+
+ CaptureSnapshot cs = actorContext.getSnapshotManager().getCaptureSnapshot();
assertTrue(cs.isInstallSnapshotInitiated());
assertEquals(3, cs.getLastAppliedIndex());
// if an initiate is started again when first is in progress, it shouldnt initiate Capture
leader.handleMessage(leaderActor, new Replicate(null, "state-id", entry));
- List<CaptureSnapshot> captureSnapshots = MessageCollectorActor.getAllMatching(leaderActor, CaptureSnapshot.class);
- assertEquals("CaptureSnapshot should not get invoked when initiate is in progress", 1, captureSnapshots.size());
+ Assert.assertSame("CaptureSnapshot instance", cs, actorContext.getSnapshotManager().getCaptureSnapshot());
}
@Test
@Override
protected MockRaftActorContext createActorContext(ActorRef actorRef) {
- return createActorContext("leader", actorRef);
+ return createActorContext(LEADER_ID, actorRef);
}
private MockRaftActorContext createActorContextWithFollower() {
MockRaftActorContext leaderActorContext = createActorContext();
MockRaftActorContext followerActorContext = createActorContext(FOLLOWER_ID, followerActor);
+ followerActorContext.setPeerAddresses(ImmutableMap.of(LEADER_ID, leaderActor.path().toString()));
Follower follower = new Follower(followerActorContext);
followerActor.underlyingActor().setBehavior(follower);
- Map<String, String> peerAddresses = new HashMap<>();
- peerAddresses.put(FOLLOWER_ID, followerActor.path().toString());
+ Map<String, String> leaderPeerAddresses = new HashMap<>();
+ leaderPeerAddresses.put(FOLLOWER_ID, followerActor.path().toString());
- leaderActorContext.setPeerAddresses(peerAddresses);
+ leaderActorContext.setPeerAddresses(leaderPeerAddresses);
leaderActorContext.getReplicatedLog().removeFrom(0);
MockRaftActorContext followerActorContext = createActorContext(FOLLOWER_ID, followerActor);
followerActorContext.setConfigParams(configParams);
+ followerActorContext.setPeerAddresses(ImmutableMap.of(LEADER_ID, leaderActor.path().toString()));
Follower follower = new Follower(followerActorContext);
followerActor.underlyingActor().setBehavior(follower);
Code Review / controller.git / blobdiff