Package net.kuujo.copycat.internal.log

Examples of net.kuujo.copycat.internal.log.ConfigurationEntry$Serializer

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  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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    LOGGER.debug("{} - Applied {} entries to state machine", context.clusterManager().localNode(), count);

    // Ensure that the cluster configuration is up-to-date and properly
    // replicated by committing the current configuration to the log. This will
    // ensure that nodes' cluster configurations are consistent with the leader's.
    ConfigurationEntry configEntry = new ConfigurationEntry(context.currentTerm(), context.clusterManager().cluster().config().copy());
    long configIndex = context.log().appendEntry(configEntry);
    LOGGER.debug("{} - Appended {} to log at index {}", context.clusterManager().localNode(), configEntry, configIndex);

    // Start observing the user provided cluster configuration for changes.
    // When the cluster configuration changes, changes will be committed to the
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      // 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.
      LOGGER.debug("{} - Committing all entries for configuration change", context.clusterManager().localNode());
      replicator.commit(configIndex).whenComplete((commitIndex2, commitError2) -> {
        // Now that we've gotten to this point, we know that the combined cluster
        // membership has been replicated to a majority of the cluster.
        // Append the new user configuration to the log and force all replicas
        // to be synchronized.
        ConfigurationEntry newConfigEntry = new ConfigurationEntry(context.currentTerm(), userConfig);
        long newConfigIndex = context.log().appendEntry(newConfigEntry);
        LOGGER.debug("{} - Appended {} to log at index {}", context.clusterManager().localNode(), newConfigEntry, newConfigIndex);

        // Again, once we've appended the new configuration to the log, update
        // the local internal configuration.
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  public void testWriteReadSyncRequest() {
    ClusterConfig<Member> clusterConfig = new ClusterConfig<>()
      .withLocalMember(new Member(new MemberConfig("foo")))
      .withRemoteMembers(new Member(new MemberConfig("bar")), new Member(new MemberConfig("baz")));
    SnapshotEntry snapshotEntry = new SnapshotEntry(1, clusterConfig, new byte[50]);
    ConfigurationEntry configurationEntry = new ConfigurationEntry(1, clusterConfig);
    OperationEntry operationEntry = new OperationEntry(1, "foo", Arrays.asList("bar", "baz"));
    List<Entry> entries = Arrays.asList(snapshotEntry, configurationEntry, operationEntry);
    SyncRequest request = new SyncRequest(UUID.randomUUID().toString(), 1, "foo", 4, 1, entries, 3);
    SyncRequest result = reader.readRequest(writer.writeRequest(request));
    Assert.assertEquals(result.id(), request.id());
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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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