Examples with Outcome org.neo4j.causalclustering.core.consensus.outcome.Outcome used on opensource projects

Example 6 with Outcome

use of org.neo4j.causalclustering.core.consensus.outcome.Outcome in project neo4j by neo4j.

the class LeaderTest method leaderShouldHandleBatch.

@Test
public void leaderShouldHandleBatch() throws Exception {
    // given
    RaftState state = raftState().votingMembers(asSet(myself, member1, member2)).build();
    Leader leader = new Leader();
    int BATCH_SIZE = 3;
    RaftMessages.NewEntry.BatchRequest batchRequest = new RaftMessages.NewEntry.BatchRequest(BATCH_SIZE);
    batchRequest.add(valueOf(0));
    batchRequest.add(valueOf(1));
    batchRequest.add(valueOf(2));
    // when
    Outcome outcome = leader.handle(batchRequest, state, log());
    // then
    BatchAppendLogEntries logCommand = (BatchAppendLogEntries) single(outcome.getLogCommands());
    assertEquals(0, logCommand.baseIndex);
    for (int i = 0; i < BATCH_SIZE; i++) {
        assertEquals(0, logCommand.entries[i].term());
        assertEquals(i, ((ReplicatedInteger) logCommand.entries[i].content()).get());
    }
    ShipCommand.NewEntries shipCommand = (ShipCommand.NewEntries) single(outcome.getShipCommands());
    assertEquals(shipCommand, new ShipCommand.NewEntries(-1, -1, new RaftLogEntry[] { new RaftLogEntry(0, valueOf(0)), new RaftLogEntry(0, valueOf(1)), new RaftLogEntry(0, valueOf(2)) }));
}

Example 7 with Outcome

use of org.neo4j.causalclustering.core.consensus.outcome.Outcome in project neo4j by neo4j.

the class LeaderTest method leaderShouldSpawnMismatchCommandOnFailure.

// TODO: rethink this test, it does too much
@Test
public void leaderShouldSpawnMismatchCommandOnFailure() throws Exception {
    // given
    /*
         * A leader who
         * - has an append index of 100
         * - knows about instance 2
         * - assumes that instance 2 is fully caught up
         */
    Leader leader = new Leader();
    MemberId instance2 = member(2);
    FollowerState instance2State = createArtificialFollowerState(100);
    ReadableRaftState state = mock(ReadableRaftState.class);
    FollowerStates<MemberId> followerState = new FollowerStates<>();
    followerState = new FollowerStates<>(followerState, instance2, instance2State);
    RaftLog log = new InMemoryRaftLog();
    for (int i = 0; i <= 100; i++) {
        log.append(new RaftLogEntry(0, valueOf(i)));
    }
    when(state.commitIndex()).thenReturn(-1L);
    when(state.entryLog()).thenReturn(log);
    when(state.followerStates()).thenReturn(followerState);
    // both leader and follower are in the same term
    when(state.term()).thenReturn(4L);
    // when
    // that leader is asked to handle a response from that follower that says that the follower is still missing
    // things
    RaftMessages.AppendEntries.Response response = appendEntriesResponse().failure().appendIndex(0).matchIndex(-1).term(4).from(instance2).build();
    Outcome outcome = leader.handle(response, state, mock(Log.class));
    // then
    int mismatchCount = 0;
    for (ShipCommand shipCommand : outcome.getShipCommands()) {
        if (shipCommand instanceof ShipCommand.Mismatch) {
            mismatchCount++;
        }
    }
    assertThat(mismatchCount, greaterThan(0));
}

Example 8 with Outcome

use of org.neo4j.causalclustering.core.consensus.outcome.Outcome in project neo4j by neo4j.

the class LeaderTest method leaderShouldNotRespondToSuccessResponseFromFollowerThatWillSoonUpToDateViaInFlightMessages.

@Test
public void leaderShouldNotRespondToSuccessResponseFromFollowerThatWillSoonUpToDateViaInFlightMessages() throws Exception {
    // given
    /*
         * A leader who
         * - has an append index of 100
         * - knows about instance 2
         * - assumes that instance 2 is at an index less than 100 -say 84 but it has already been sent up to 100
         */
    Leader leader = new Leader();
    MemberId instance2 = member(2);
    FollowerState instance2State = createArtificialFollowerState(84);
    ReadableRaftState state = mock(ReadableRaftState.class);
    FollowerStates<MemberId> followerState = new FollowerStates<>();
    followerState = new FollowerStates<>(followerState, instance2, instance2State);
    ReadableRaftLog logMock = mock(ReadableRaftLog.class);
    when(logMock.appendIndex()).thenReturn(100L);
    when(state.commitIndex()).thenReturn(-1L);
    when(state.entryLog()).thenReturn(logMock);
    when(state.followerStates()).thenReturn(followerState);
    // both leader and follower are in the same term
    when(state.term()).thenReturn(4L);
    // when
    // that leader is asked to handle a response from that follower that says that the follower is up to date
    RaftMessages.AppendEntries.Response response = appendEntriesResponse().success().matchIndex(90).term(4).from(instance2).build();
    Outcome outcome = leader.handle(response, state, mock(Log.class));
    // then
    // The leader should not be trying to send any messages to that instance
    assertTrue(outcome.getOutgoingMessages().isEmpty());
    // And the follower state should be updated
    FollowerStates<MemberId> leadersViewOfFollowerStates = outcome.getFollowerStates();
    assertEquals(90, leadersViewOfFollowerStates.get(instance2).getMatchIndex());
}

Example 9 with Outcome

use of org.neo4j.causalclustering.core.consensus.outcome.Outcome in project neo4j by neo4j.

the class LeaderTest method leaderShouldStepDownWhenLackingHeartbeatResponses.

@Test
public void leaderShouldStepDownWhenLackingHeartbeatResponses() throws Exception {
    // given
    RaftState state = raftState().votingMembers(asSet(myself, member1, member2)).leader(myself).build();
    Leader leader = new Leader();
    leader.handle(new RaftMessages.Timeout.Election(myself), state, log());
    // when
    Outcome outcome = leader.handle(new RaftMessages.Timeout.Election(myself), state, log());
    // then
    assertThat(outcome.getRole(), not(LEADER));
    assertNull(outcome.getLeader());
}

Example 10 with Outcome

use of org.neo4j.causalclustering.core.consensus.outcome.Outcome in project neo4j by neo4j.

the class NonFollowerVoteRequestTest method shouldRejectVoteRequestFromPreviousTerm.

@Test
public void shouldRejectVoteRequestFromPreviousTerm() throws Exception {
    RaftState state = newState();
    // when
    final long candidateTerm = state.term() - 1;
    Outcome outcome = role.handler.handle(voteRequest().from(member1).term(candidateTerm).lastLogIndex(0).lastLogTerm(-1).build(), state, log());
    // then
    assertFalse(((RaftMessages.Vote.Response) messageFor(outcome, member1)).voteGranted());
    assertEquals(role, outcome.getRole());
}