Examples with RaftCoreState org.neo4j.causalclustering.core.state.snapshot.RaftCoreState used on opensource projects

Example 1 with RaftCoreState

use of org.neo4j.causalclustering.core.state.snapshot.RaftCoreState in project neo4j by neo4j.

the class RaftMachineTest method shouldVoteFalseForCandidateInOldTerm.

@Test
public void shouldVoteFalseForCandidateInOldTerm() throws Exception {
    // Given
    FakeClock fakeClock = Clocks.fakeClock();
    ControlledRenewableTimeoutService timeouts = new ControlledRenewableTimeoutService(fakeClock);
    OutboundMessageCollector messages = new OutboundMessageCollector();
    RaftMachine raft = new RaftMachineBuilder(myself, 3, RaftTestMemberSetBuilder.INSTANCE).timeoutService(timeouts).clock(fakeClock).outbound(messages).build();
    raft.installCoreState(new RaftCoreState(new MembershipEntry(0, asSet(myself, member1, member2))));
    raft.startTimers();
    // When
    raft.handle(voteRequest().from(member1).term(-1).candidate(member1).lastLogIndex(0).lastLogTerm(-1).build());
    // Then
    assertThat(messages.sentTo(member1).size(), equalTo(1));
    assertThat(messages.sentTo(member1), hasItem(voteResponse().from(myself).term(0).deny().build()));
}

Example 2 with RaftCoreState

use of org.neo4j.causalclustering.core.state.snapshot.RaftCoreState in project neo4j by neo4j.

the class RaftMachineTest method shouldNotBecomeLeaderWhenVotingOnItself.

@Test
public void shouldNotBecomeLeaderWhenVotingOnItself() throws Exception {
    // Given
    FakeClock fakeClock = Clocks.fakeClock();
    ControlledRenewableTimeoutService timeouts = new ControlledRenewableTimeoutService(fakeClock);
    RaftMachine raft = new RaftMachineBuilder(myself, 3, RaftTestMemberSetBuilder.INSTANCE).timeoutService(timeouts).clock(fakeClock).build();
    raft.installCoreState(new RaftCoreState(new MembershipEntry(0, asSet(myself, member1, member2))));
    raft.startTimers();
    timeouts.invokeTimeout(ELECTION);
    // When
    raft.handle(voteResponse().from(myself).term(1).grant().build());
    // Then
    assertThat(raft.isLeader(), is(false));
}

Example 3 with RaftCoreState

use of org.neo4j.causalclustering.core.state.snapshot.RaftCoreState in project neo4j by neo4j.

the class CatchUpTest method newMemberWithNoLogShouldCatchUpFromPeers.

@Test
public void newMemberWithNoLogShouldCatchUpFromPeers() throws Throwable {
    DirectNetworking net = new DirectNetworking();
    // given
    final MemberId leaderId = member(0);
    final MemberId sleepyId = member(2);
    final MemberId[] awakeMembers = { leaderId, member(1) };
    final MemberId[] allMembers = { leaderId, member(1), sleepyId };
    RaftTestFixture fixture = new RaftTestFixture(net, 3, allMembers);
    fixture.bootstrap(allMembers);
    fixture.members().withId(leaderId).raftInstance().installCoreState(new RaftCoreState(new MembershipEntry(0, new HashSet<>(Arrays.asList(allMembers)))));
    fixture.members().withId(leaderId).timeoutService().invokeTimeout(RaftMachine.Timeouts.ELECTION);
    net.processMessages();
    final MemberId leader = fixture.members().withId(leaderId).member();
    net.disconnect(sleepyId);
    // when
    fixture.members().withId(leaderId).raftInstance().handle(new Request(leader, valueOf(10)));
    fixture.members().withId(leaderId).raftInstance().handle(new Request(leader, valueOf(20)));
    fixture.members().withId(leaderId).raftInstance().handle(new Request(leader, valueOf(30)));
    fixture.members().withId(leaderId).raftInstance().handle(new Request(leader, valueOf(40)));
    net.processMessages();
    // then
    for (MemberId awakeMember : awakeMembers) {
        assertThat(integerValues(fixture.members().withId(awakeMember).raftLog()), hasItems(10, 20, 30, 40));
    }
    assertThat(integerValues(fixture.members().withId(sleepyId).raftLog()), empty());
    // when
    net.reconnect(sleepyId);
    // TODO: This needs an injectable/controllable timeout service for the log shipper.
    Thread.sleep(500);
    net.processMessages();
    // then
    assertThat(integerValues(fixture.members().withId(sleepyId).raftLog()), hasItems(10, 20, 30, 40));
}

Example 4 with RaftCoreState

use of org.neo4j.causalclustering.core.state.snapshot.RaftCoreState in project neo4j by neo4j.

the class RaftMachineTest method shouldAppendNewLeaderBarrierAfterBecomingLeader.

@Test
public void shouldAppendNewLeaderBarrierAfterBecomingLeader() throws Exception {
    // Given
    FakeClock fakeClock = Clocks.fakeClock();
    ControlledRenewableTimeoutService timeouts = new ControlledRenewableTimeoutService(fakeClock);
    OutboundMessageCollector messages = new OutboundMessageCollector();
    InMemoryRaftLog raftLog = new InMemoryRaftLog();
    RaftMachine raft = new RaftMachineBuilder(myself, 3, RaftTestMemberSetBuilder.INSTANCE).timeoutService(timeouts).clock(fakeClock).outbound(messages).raftLog(raftLog).build();
    raft.installCoreState(new RaftCoreState(new MembershipEntry(0, asSet(myself, member1, member2))));
    raft.startTimers();
    // When
    timeouts.invokeTimeout(ELECTION);
    raft.handle(voteResponse().from(member1).term(1).grant().build());
    // Then
    assertEquals(new NewLeaderBarrier(), readLogEntry(raftLog, raftLog.appendIndex()).content());
}

Example 5 with RaftCoreState

use of org.neo4j.causalclustering.core.state.snapshot.RaftCoreState in project neo4j by neo4j.

the class RaftMachineTest method shouldThrowExceptionIfReceivesClientRequestWithNoLeaderElected.

@Test
public void shouldThrowExceptionIfReceivesClientRequestWithNoLeaderElected() throws Exception {
    // Given
    FakeClock fakeClock = Clocks.fakeClock();
    ControlledRenewableTimeoutService timeouts = new ControlledRenewableTimeoutService(fakeClock);
    RaftMachine raft = new RaftMachineBuilder(myself, 3, RaftTestMemberSetBuilder.INSTANCE).timeoutService(timeouts).clock(fakeClock).build();
    raft.installCoreState(new RaftCoreState(new MembershipEntry(0, asSet(myself, member1, member2))));
    raft.startTimers();
    try {
        // When
        // There is no leader
        raft.getLeader();
        fail("Should have thrown exception");
    }// Then
     catch (NoLeaderFoundException e) {
    // expected
    }
}