Package net.kuujo.copycat.internal.util

Examples of net.kuujo.copycat.internal.util.Quorum

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    // Send vote requests to all nodes. The vote request that is sent
    // to this node will be automatically successful.
    // First check if the quorum is null. If the quorum isn't null then that
    // indicates that another vote is already going on.
    final Quorum quorum = new Quorum((int) Math.floor(context.clusterManager().nodes().size() / 2) + 1, (elected) -> {
      complete.set(true);
      if (elected) {
        context.transition(LeaderController.class);
      } else {
        context.transition(FollowerController.class);
      }
    }).countSelf();

    // First, load the last log entry to get its term. We load the entry
    // by its index since the index is required by the protocol.
    final long lastIndex = context.log().lastIndex();
    CopycatEntry lastEntry = context.log().getEntry(lastIndex);

    // Once we got the last log term, iterate through each current member
    // of the cluster and poll each member for a vote.
    LOGGER.info("{} - Polling members {}", context.clusterManager().localNode(), context.clusterManager().cluster().remoteMembers());
    final long lastTerm = lastEntry != null ? lastEntry.term() : 0;
    for (RemoteNode<?> node : (Set<RemoteNode<?>>) context.clusterManager().remoteNodes()) {
      final ProtocolClient client = node.client();
      client.connect().whenComplete((result1, error1) -> {
        if (error1 != null) {
          quorum.fail();
        } else {
          LOGGER.debug("{} - Polling {}", context.clusterManager().localNode(), node.member());
          client.poll(new PollRequest(context.nextCorrelationId(), context.currentTerm(), context.clusterManager()
            .localNode()
            .member()
            .id(), lastIndex, lastTerm)).whenComplete((result2, error2) -> {
            client.close();
            if (!complete.get()) {
              if (error2 != null) {
                LOGGER.warn(context.clusterManager().localNode().toString(), error2);
                quorum.fail();
              } else if (!result2.voteGranted()) {
                LOGGER.info("{} - Received rejected vote from {}", context.clusterManager().localNode(), node.member());
                quorum.fail();
              } else if (result2.term() != context.currentTerm()) {
                LOGGER.info("{} - Received successful vote for a different term from {}", context.clusterManager()
                  .localNode(), node.member());
                quorum.fail();
              } else {
                LOGGER.info("{} - Received successful vote from {}", context.clusterManager()
                  .localNode(), node.member());
                quorum.succeed();
              }
            }
          });
        }
      });
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    CompletableFuture<Long> future = new CompletableFuture<>();

    // Set up a write quorum. Once the log entry has been replicated to
    // the required number of replicas in order to meet the write quorum
    // requirement, the future will succeed.
    final Quorum quorum = new Quorum(writeQuorum, succeeded -> {
      if (succeeded) {
        future.complete(index);
      } else {
        future.completeExceptionally(new CopycatException("Failed to obtain quorum"));
      }
    }).countSelf();

    // Iterate through replicas and commit all entries up to the given index.
    for (NodeReplicator replica : replicaMap.values()) {
      replica.replicate(index).whenComplete((resultIndex, error) -> {
        // Once the commit succeeds, check the commit index of all replicas.
        if (error == null) {
          quorum.succeed();
          checkCommits();
        } else {
          quorum.fail();
        }
      });
    }
    return future;
  }
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  public CompletableFuture<Long> ping(long index) {
    CompletableFuture<Long> future = new CompletableFuture<>();

    // Set up a read quorum. Once the required number of replicas have been
    // contacted the quorum will succeed.
    final Quorum quorum = new Quorum(readQuorum, succeeded -> {
      if (succeeded) {
        future.complete(index);
      } else {
        future.completeExceptionally(new CopycatException("Failed to obtain quorum"));
      }
    }).countSelf();

    // Iterate through replicas and ping each replica. Internally, this
    // should cause the replica to send any remaining entries if necessary.
    for (NodeReplicator replica : replicaMap.values()) {
      replica.ping(index).whenComplete((resultIndex, error) -> {
        if (error == null) {
          quorum.succeed();
        } else {
          quorum.fail();
        }
      });
    }
    return future;
  }
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Related Classes of net.kuujo.copycat.internal.util.Quorum

  • net.kuujo.copycat.internal.replication.ClusterReplicator
  • net.kuujo.copycat.internal.state.CandidateController
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