Package net.kuujo.copycat.cluster

Examples of net.kuujo.copycat.cluster.ClusterConfig

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  }

  public void testCompactEndOfLog() throws Exception {
    appendEntries();
    log.compact(5,
      new SnapshotEntry(1, new ClusterConfig()
        .withLocalMember(new Member("foo"))
        .withRemoteMembers(new Member("bar"), new Member("baz")), "Hello world!".getBytes()));

    assertEquals(log.firstIndex(), 5);
    assertEquals(log.lastIndex(), 5);
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  }

  public void testCompactMiddleOfLog() throws Exception {
    appendEntries();
    log.compact(3,
      new SnapshotEntry(1, new ClusterConfig()
        .withLocalMember(new Member("foo"))
        .withRemoteMembers(new Member("bar"), new Member("baz")), "Hello world!".getBytes()));

    assertEquals(log.firstIndex(), 3);
    assertEquals(log.lastIndex(), 5);
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    log.appendEntry(new OperationEntry(1, "foo", "bar"));
    assertNotEquals(size, size = log.size());
  }

  private void appendEntries() {
    log.appendEntry(new SnapshotEntry(1, new ClusterConfig()
      .withLocalMember(new Member("foo"))
      .withRemoteMembers(new Member("bar"), new Member("baz")), new byte[10]));
    log.appendEntry(new ConfigurationEntry(1, new ClusterConfig()
      .withLocalMember(new Member("foo"))
      .withRemoteMembers(new Member("bar"), new Member("baz"))));
    log.appendEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")));
    log.appendEntry(new OperationEntry(1, "bar", Arrays.asList("bar", "baz")));
    log.appendEntry(new OperationEntry(1, "baz", Arrays.asList("bar", "baz")));
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  private Object[][] entryProvider() {
    return new Object[][] {
      {OperationEntry.class, new OperationEntry(1, "foo", Arrays.asList("bar", "baz"))},
      {
        ConfigurationEntry.class,
        new ConfigurationEntry(1, new ClusterConfig().withLocalMember(new Member("foo"))
          .withRemoteMembers(new Member("bar"), new Member("baz")))},
      {
        SnapshotEntry.class,
        new SnapshotEntry(1, new ClusterConfig().withLocalMember(new Member("foo"))
          .withRemoteMembers(new Member("bar"), new Member("baz")), new byte[] {1, 2, 3})}};
  }
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    // First, store a copy of both the current internal cluster configuration and
    // the user defined cluster configuration. This ensures that mutable configurations
    // are not changed during the reconfiguration process which can be asynchronous.
    // Note also that we create a copy of the configuration in order to ensure that
    // polymorphic types are properly reconstructed.
    final ClusterConfig userConfig = cluster.copy();
    final ClusterConfig internalConfig = context.clusterManager().cluster().config().copy();

    // If another cluster configuration change is occurring right now, it's possible
    // that the two configuration changes could overlap one another. In order to
    // avoid this, we wait until all entries up to the current log index have been
    // committed before beginning the configuration change. This ensures that any
    // previous configuration changes have completed.
    LOGGER.debug("{} - Committing all entries for configuration change", context.clusterManager().localNode());
    replicator.commitAll().whenComplete((commitIndex, commitError) -> {
      // First we need to create a joint old/new cluster configuration entry.
      // We copy the internal configuration again for safety from modifications.
      final ClusterConfig jointConfig = internalConfig.copy().addRemoteMembers(userConfig.getRemoteMembers());

      // Append the joint configuration to the log. This will be replicated to
      // followers and applied to their internal cluster managers.
      ConfigurationEntry jointConfigEntry = new ConfigurationEntry(context.currentTerm(), jointConfig);
      long configIndex = context.log().appendEntry(jointConfigEntry);
      LOGGER.debug("{} - Appended {} to log at index {}", context.clusterManager().localNode(), jointConfigEntry, configIndex);

      // Immediately after the entry is appended to the log, apply the joint
      // configuration. Cluster membership changes do not wait for commitment.
      // Since we're using a joint consensus, it's safe to work with all members
      // of both the old and new configuration without causing split elections.
      context.clusterManager().cluster().update(jointConfig, null);
      context.events().membershipChange().handle(new MembershipChangeEvent(jointConfig.getMembers()));
      LOGGER.debug("{} - Updated internal cluster configuration {}", context.clusterManager().localNode(), context.clusterManager().cluster());

      // Once the cluster is updated, the replicator will be notified and update its
      // internal connections. Then we commit the joint configuration and allow
      // it to be replicated to all the nodes in the updated cluster.
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      .withProtocol(protocol)
      .withTerm(3)
      .withLeader("baz")
      .withStateMachine(new TestStateMachine())
      .withLog(new TestLog()
        .withEntry(new ConfigurationEntry(1, new ClusterConfig()
          .withLocalMember(new Member("foo"))
          .withRemoteMembers(new Member("bar"), new Member("baz"))))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(2, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(2, "foo", Arrays.asList("bar", "baz"))))
      .withState(CopycatState.FOLLOWER)
      .withCommitIndex(6)
      .withLastApplied(6);
    cluster.addNode(node1);

    TestNode node2 = new TestNode()
      .withCluster("bar", "foo", "baz")
      .withProtocol(protocol)
      .withTerm(3)
      .withLeader("baz")
      .withStateMachine(new TestStateMachine())
      .withLog(new TestLog()
        .withEntry(new ConfigurationEntry(1, new ClusterConfig()
          .withLocalMember(new Member("bar"))
          .withRemoteMembers(new Member("foo"), new Member("baz"))))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(2, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(2, "foo", Arrays.asList("bar", "baz"))))
      .withState(CopycatState.FOLLOWER)
      .withCommitIndex(6)
      .withLastApplied(6);
    cluster.addNode(node2);

    TestNode node3 = new TestNode()
      .withCluster("baz", "bar", "foo")
      .withProtocol(protocol)
      .withTerm(3)
      .withLeader("baz")
      .withStateMachine(new TestStateMachine())
      .withLog(new TestLog()
        .withEntry(new ConfigurationEntry(1, new ClusterConfig()
          .withLocalMember(new Member("baz"))
          .withRemoteMembers(new Member("foo"), new Member("bar"))))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
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      .withProtocol(protocol)
      .withTerm(3)
      .withLeader("baz")
      .withStateMachine(new TestStateMachine())
      .withLog(new TestLog()
        .withEntry(new ConfigurationEntry(1, new ClusterConfig()
          .withLocalMember(new Member("foo"))
          .withRemoteMembers(new Member("bar"), new Member("baz"), new Member("foobarbaz"))))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(2, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(2, "foo", Arrays.asList("bar", "baz"))))
      .withState(CopycatState.FOLLOWER)
      .withCommitIndex(6)
      .withLastApplied(6);
    cluster.addNode(node1);

    TestNode node2 = new TestNode()
      .withCluster("bar", "foo", "baz", "foobarbaz")
      .withProtocol(protocol)
      .withTerm(3)
      .withLeader("baz")
      .withStateMachine(new TestStateMachine())
      .withLog(new TestLog()
        .withEntry(new ConfigurationEntry(1, new ClusterConfig()
          .withLocalMember(new Member("bar"))
          .withRemoteMembers(new Member("foo"), new Member("baz"), new Member("foobarbaz"))))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(2, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(2, "foo", Arrays.asList("bar", "baz"))))
      .withState(CopycatState.FOLLOWER)
      .withCommitIndex(6)
      .withLastApplied(6);
    cluster.addNode(node2);

    TestNode node3 = new TestNode()
      .withCluster("baz", "bar", "foo", "foobarbaz")
      .withProtocol(protocol)
      .withTerm(3)
      .withLeader("baz")
      .withStateMachine(new TestStateMachine())
      .withLog(new TestLog()
        .withEntry(new ConfigurationEntry(1, new ClusterConfig()
          .withLocalMember(new Member("baz"))
          .withRemoteMembers(new Member("foo"), new Member("bar"), new Member("foobarbaz"))))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
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      .withProtocol(protocol)
      .withTerm(3)
      .withLeader(null)
      .withStateMachine(new TestStateMachine())
      .withLog(new TestLog()
        .withEntry(new ConfigurationEntry(1, new ClusterConfig()
          .withLocalMember(new Member("foo"))
          .withRemoteMembers(new Member("bar"), new Member("baz"))))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(2, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(2, "foo", Arrays.asList("bar", "baz"))))
      .withState(CopycatState.CANDIDATE)
      .withCommitIndex(6)
      .withLastApplied(6);
    cluster.addNode(node1);

    TestNode node2 = new TestNode()
      .withCluster("bar", "foo", "baz")
      .withProtocol(protocol)
      .withTerm(3)
      .withLeader(null)
      .withStateMachine(new TestStateMachine())
      .withLog(new TestLog()
        .withEntry(new ConfigurationEntry(1, new ClusterConfig()
          .withLocalMember(new Member("bar"))
          .withRemoteMembers(new Member("foo"), new Member("baz"))))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
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      .withProtocol(protocol)
      .withTerm(3)
      .withLeader("baz")
      .withStateMachine(new TestStateMachine())
      .withLog(new TestLog()
        .withEntry(new ConfigurationEntry(1, new ClusterConfig()
          .withLocalMember(new Member("foo"))
          .withRemoteMembers(new Member("bar"), new Member("baz"))))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(2, "foo", Arrays.asList("bar", "baz"))))
      .withState(CopycatState.FOLLOWER)
      .withCommitIndex(5)
      .withLastApplied(5)
      .withVotedFor(null);
    cluster.addNode(node1);

    TestNode node2 = new TestNode()
      .withCluster("bar", "foo", "baz")
      .withProtocol(protocol)
      .withTerm(3)
      .withLeader("baz")
      .withStateMachine(new TestStateMachine())
      .withLog(new TestLog()
        .withEntry(new ConfigurationEntry(1, new ClusterConfig()
          .withLocalMember(new Member("bar"))
          .withRemoteMembers(new Member("foo"), new Member("baz"))))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
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      .withProtocol(protocol)
      .withTerm(3)
      .withLeader(null)
      .withStateMachine(new TestStateMachine())
      .withLog(new TestLog()
        .withEntry(new ConfigurationEntry(1, new ClusterConfig()
          .withLocalMember(new Member("foo"))
          .withRemoteMembers(new Member("bar"), new Member("baz"))))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(2, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(2, "foo", Arrays.asList("bar", "baz"))))
      .withState(CopycatState.CANDIDATE)
      .withCommitIndex(6)
      .withLastApplied(6)
      .withVotedFor("foo");
    cluster.addNode(node1);

    TestNode node2 = new TestNode()
      .withCluster("bar", "foo", "baz")
      .withProtocol(protocol)
      .withTerm(3)
      .withLeader(null)
      .withStateMachine(new TestStateMachine())
      .withLog(new TestLog()
        .withEntry(new ConfigurationEntry(1, new ClusterConfig()
          .withLocalMember(new Member("bar"))
          .withRemoteMembers(new Member("foo"), new Member("baz"))))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
        .withEntry(new OperationEntry(1, "foo", Arrays.asList("bar", "baz")))
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Related Classes of net.kuujo.copycat.cluster.ClusterConfig

  • net.kuujo.copycat.functional.ConfigurationTest
  • net.kuujo.copycat.functional.LeaderElectionTest
  • net.kuujo.copycat.functional.SnapshotTest
  • net.kuujo.copycat.internal.state.LeaderController
  • net.kuujo.copycat.log.AbstractLogTest
  • net.kuujo.copycat.log.ChronicleLogTest
  • net.kuujo.copycat.log.EntryTest
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