Examples with ClusterContext org.neo4j.cluster.protocol.cluster.ClusterContext used on opensource projects

Example 16 with ClusterContext

use of org.neo4j.cluster.protocol.cluster.ClusterContext in project neo4j by neo4j.

the class ElectionContextTest method electorLeavingAndRejoiningWithNoElectionsInBetweenMustStillHaveElectionsGoThrough.

/*
     * This assumes an instance leaves the cluster normally and then rejoins, without any elections in between. The
     * expected result is that it will succeed in sending election results.
     */
@Test
public void electorLeavingAndRejoiningWithNoElectionsInBetweenMustStillHaveElectionsGoThrough() throws Exception {
    // Given
    final String role1 = "coordinator1";
    InstanceId me = new InstanceId(1);
    InstanceId leavingInstance = new InstanceId(2);
    InstanceId forQuorum = new InstanceId(3);
    Config config = mock(Config.class);
    when(config.get(ClusterSettings.max_acceptors)).thenReturn(10);
    ClusterConfiguration clusterConfiguration = mock(ClusterConfiguration.class);
    List<InstanceId> clusterMemberIds = new LinkedList<InstanceId>();
    clusterMemberIds.add(leavingInstance);
    clusterMemberIds.add(me);
    clusterMemberIds.add(forQuorum);
    when(clusterConfiguration.getMemberIds()).thenReturn(clusterMemberIds);
    MultiPaxosContext context = new MultiPaxosContext(me, Iterables.<ElectionRole, ElectionRole>iterable(new ElectionRole(role1)), clusterConfiguration, new Executor() {

        @Override
        public void execute(Runnable command) {
            command.run();
        }
    }, NullLogProvider.getInstance(), mock(ObjectInputStreamFactory.class), mock(ObjectOutputStreamFactory.class), mock(AcceptorInstanceStore.class), mock(Timeouts.class), mock(ElectionCredentialsProvider.class), config);
    HeartbeatContext heartbeatContext = context.getHeartbeatContext();
    ClusterContext clusterContext = context.getClusterContext();
    clusterContext.setLastElector(leavingInstance);
    clusterContext.setLastElectorVersion(8);
    // When the elector leaves the cluster
    clusterContext.left(leavingInstance);
    // Then the elector is reset to defaults
    assertEquals(clusterContext.getLastElector(), InstanceId.NONE);
    assertEquals(clusterContext.getLastElectorVersion(), ClusterContext.NO_ELECTOR_VERSION);
    // When the elector comes back with an election result
    // We don't need to join, election results do not check for elector membership
    clusterContext.elected(role1, forQuorum, leavingInstance, 9);
    // Then the result is actually respected
    assertEquals(clusterContext.getLastElector(), leavingInstance);
    assertEquals(clusterContext.getLastElectorVersion(), 9);
}

Example 17 with ClusterContext

use of org.neo4j.cluster.protocol.cluster.ClusterContext in project neo4j by neo4j.

the class ElectionContextTest method failedElectorRejoiningMustHaveItsVersionFromVoteRequestsSetTheElectorVersion.

@Test
public void failedElectorRejoiningMustHaveItsVersionFromVoteRequestsSetTheElectorVersion() throws Throwable {
    // Given
    final String role1 = "coordinator1";
    InstanceId me = new InstanceId(1);
    InstanceId failingInstance = new InstanceId(2);
    InstanceId forQuorum = new InstanceId(3);
    Config config = mock(Config.class);
    when(config.get(ClusterSettings.max_acceptors)).thenReturn(10);
    ClusterConfiguration clusterConfiguration = mock(ClusterConfiguration.class);
    List<InstanceId> clusterMemberIds = new LinkedList<InstanceId>();
    clusterMemberIds.add(failingInstance);
    clusterMemberIds.add(me);
    clusterMemberIds.add(forQuorum);
    when(clusterConfiguration.getMemberIds()).thenReturn(clusterMemberIds);
    MultiPaxosContext context = new MultiPaxosContext(me, Iterables.iterable(new ElectionRole(role1)), clusterConfiguration, new Executor() {

        @Override
        public void execute(Runnable command) {
            command.run();
        }
    }, NullLogProvider.getInstance(), mock(ObjectInputStreamFactory.class), mock(ObjectOutputStreamFactory.class), mock(AcceptorInstanceStore.class), mock(Timeouts.class), mock(ElectionCredentialsProvider.class), config);
    HeartbeatContext heartbeatContext = context.getHeartbeatContext();
    ClusterContext clusterContext = context.getClusterContext();
    clusterContext.setLastElector(failingInstance);
    clusterContext.setLastElectorVersion(8);
    // When the elector fails
    heartbeatContext.suspicions(forQuorum, Collections.singleton(failingInstance));
    heartbeatContext.suspect(failingInstance);
    // Then the elector is reset to defaults
    assertEquals(clusterContext.getLastElector(), InstanceId.NONE);
    assertEquals(clusterContext.getLastElectorVersion(), ClusterContext.NO_ELECTOR_VERSION);
    // When the elector comes back with an election result
    clusterContext.elected(role1, forQuorum, failingInstance, 9);
    // Then the result is actually respected
    assertEquals(clusterContext.getLastElector(), failingInstance);
    assertEquals(clusterContext.getLastElectorVersion(), 9);
}

Example 18 with ClusterContext

use of org.neo4j.cluster.protocol.cluster.ClusterContext in project neo4j by neo4j.

the class ElectionContextTest method twoVotesFromSameInstanceForSameRoleShouldBeConsolidated.

@Test
public void twoVotesFromSameInstanceForSameRoleShouldBeConsolidated() throws Exception {
    // Given
    final String coordinatorRole = "coordinator";
    HeartbeatContext heartbeatContext = mock(HeartbeatContext.class);
    when(heartbeatContext.getFailed()).thenReturn(Collections.<InstanceId>emptySet());
    Map<InstanceId, URI> members = new HashMap<InstanceId, URI>();
    members.put(new InstanceId(1), URI.create("server1"));
    members.put(new InstanceId(2), URI.create("server2"));
    members.put(new InstanceId(3), URI.create("server3"));
    Config config = mock(Config.class);
    when(config.get(ClusterSettings.max_acceptors)).thenReturn(10);
    ClusterConfiguration clusterConfiguration = mock(ClusterConfiguration.class);
    when(clusterConfiguration.getMembers()).thenReturn(members);
    ClusterContext clusterContext = mock(ClusterContext.class);
    when(clusterContext.getConfiguration()).thenReturn(clusterConfiguration);
    MultiPaxosContext context = new MultiPaxosContext(new InstanceId(1), Iterables.iterable(new ElectionRole(coordinatorRole)), clusterConfiguration, mock(Executor.class), NullLogProvider.getInstance(), mock(ObjectInputStreamFactory.class), mock(ObjectOutputStreamFactory.class), mock(AcceptorInstanceStore.class), mock(Timeouts.class), mock(ElectionCredentialsProvider.class), config);
    ElectionContext toTest = context.getElectionContext();
    // When
    toTest.startElectionProcess(coordinatorRole);
    toTest.voted(coordinatorRole, new InstanceId(1), new IntegerElectionCredentials(100), ClusterContext.NO_ELECTOR_VERSION);
    toTest.voted(coordinatorRole, new InstanceId(2), new IntegerElectionCredentials(100), ClusterContext.NO_ELECTOR_VERSION);
    toTest.voted(coordinatorRole, new InstanceId(2), new IntegerElectionCredentials(101), ClusterContext.NO_ELECTOR_VERSION);
    // Then
    assertNull(toTest.getElectionWinner(coordinatorRole));
    assertEquals(2, toTest.getVoteCount(coordinatorRole));
}

Example 19 with ClusterContext

use of org.neo4j.cluster.protocol.cluster.ClusterContext in project neo4j by neo4j.

the class ElectionContextTest method testElectionNotOkQuorumFailedTwoInstances.

@Test
public void testElectionNotOkQuorumFailedTwoInstances() {
    Set<InstanceId> failed = new HashSet<InstanceId>();
    failed.add(new InstanceId(2));
    Map<InstanceId, URI> members = new HashMap<InstanceId, URI>();
    members.put(new InstanceId(1), URI.create("server1"));
    members.put(new InstanceId(2), URI.create("server2"));
    Config config = mock(Config.class);
    when(config.get(ClusterSettings.max_acceptors)).thenReturn(10);
    ClusterConfiguration clusterConfiguration = mock(ClusterConfiguration.class);
    when(clusterConfiguration.getMembers()).thenReturn(members);
    ClusterContext clusterContext = mock(ClusterContext.class);
    when(clusterContext.getConfiguration()).thenReturn(clusterConfiguration);
    MultiPaxosContext context = new MultiPaxosContext(new InstanceId(1), Iterables.<ElectionRole, ElectionRole>iterable(new ElectionRole("coordinator")), clusterConfiguration, mock(Executor.class), NullLogProvider.getInstance(), mock(ObjectInputStreamFactory.class), mock(ObjectOutputStreamFactory.class), mock(AcceptorInstanceStore.class), mock(Timeouts.class), mock(ElectionCredentialsProvider.class), config);
    context.getHeartbeatContext().getFailed().addAll(failed);
    ElectionContext toTest = context.getElectionContext();
    assertFalse(toTest.electionOk());
}

Example 20 with ClusterContext

use of org.neo4j.cluster.protocol.cluster.ClusterContext in project neo4j by neo4j.

the class ElectionContextTest method baseTestForElectionOk.

private void baseTestForElectionOk(Set<InstanceId> failed, boolean moreThanQuorum) {
    Map<InstanceId, URI> members = new HashMap<InstanceId, URI>();
    members.put(new InstanceId(1), URI.create("server1"));
    members.put(new InstanceId(2), URI.create("server2"));
    members.put(new InstanceId(3), URI.create("server3"));
    Config config = mock(Config.class);
    when(config.get(ClusterSettings.max_acceptors)).thenReturn(10);
    ClusterConfiguration clusterConfiguration = mock(ClusterConfiguration.class);
    when(clusterConfiguration.getMembers()).thenReturn(members);
    ClusterContext clusterContext = mock(ClusterContext.class);
    when(clusterContext.getConfiguration()).thenReturn(clusterConfiguration);
    MultiPaxosContext context = new MultiPaxosContext(new InstanceId(1), Iterables.iterable(new ElectionRole("coordinator")), clusterConfiguration, mock(Executor.class), NullLogProvider.getInstance(), mock(ObjectInputStreamFactory.class), mock(ObjectOutputStreamFactory.class), mock(AcceptorInstanceStore.class), mock(Timeouts.class), mock(ElectionCredentialsProvider.class), config);
    context.getHeartbeatContext().getFailed().addAll(failed);
    ElectionContext toTest = context.getElectionContext();
    assertEquals(moreThanQuorum, !toTest.electionOk());
}