Examples with NoLeaderFoundException org.neo4j.causalclustering.core.consensus.NoLeaderFoundException used on opensource projects

Example 6 with NoLeaderFoundException

use of org.neo4j.causalclustering.core.consensus.NoLeaderFoundException in project neo4j by neo4j.

the class ServerPoliciesPlugin method readEndpoints.

private List<Endpoint> readEndpoints(CoreTopology coreTopology, ReadReplicaTopology rrTopology, Policy policy) {
    Set<ServerInfo> possibleReaders = rrTopology.members().entrySet().stream().map(entry -> new ServerInfo(entry.getValue().connectors().boltAddress(), entry.getKey(), entry.getValue().groups())).collect(Collectors.toSet());
    if (allowReadsOnFollowers || possibleReaders.size() == 0) {
        Set<MemberId> validCores = coreTopology.members().keySet();
        try {
            MemberId leader = leaderLocator.getLeader();
            validCores = validCores.stream().filter(memberId -> !memberId.equals(leader)).collect(Collectors.toSet());
        } catch (NoLeaderFoundException ignored) {
        // we might end up using the leader for reading during this ttl, should be fine in general
        }
        for (MemberId validCore : validCores) {
            Optional<CoreServerInfo> coreServerInfo = coreTopology.find(validCore);
            if (coreServerInfo.isPresent()) {
                CoreServerInfo serverInfo = coreServerInfo.get();
                possibleReaders.add(new ServerInfo(serverInfo.connectors().boltAddress(), validCore, serverInfo.groups()));
            }
        }
    }
    Set<ServerInfo> readers = policy.apply(possibleReaders);
    return readers.stream().map(r -> Endpoint.read(r.boltAddress())).collect(Collectors.toList());
}

Example 7 with NoLeaderFoundException

use of org.neo4j.causalclustering.core.consensus.NoLeaderFoundException in project neo4j by neo4j.

the class ClusterOverviewProcedure method apply.

@Override
public RawIterator<Object[], ProcedureException> apply(Context ctx, Object[] input) throws ProcedureException {
    List<ReadWriteEndPoint> endpoints = new ArrayList<>();
    CoreTopology coreTopology = topologyService.coreServers();
    Set<MemberId> coreMembers = coreTopology.members().keySet();
    MemberId leader = null;
    try {
        leader = leaderLocator.getLeader();
    } catch (NoLeaderFoundException e) {
        log.debug("No write server found. This can happen during a leader switch.");
    }
    for (MemberId memberId : coreMembers) {
        Optional<CoreServerInfo> coreServerInfo = coreTopology.find(memberId);
        if (coreServerInfo.isPresent()) {
            Role role = memberId.equals(leader) ? Role.LEADER : Role.FOLLOWER;
            endpoints.add(new ReadWriteEndPoint(coreServerInfo.get().connectors(), role, memberId.getUuid(), asList(coreServerInfo.get().groups())));
        } else {
            log.debug("No Address found for " + memberId);
        }
    }
    for (Map.Entry<MemberId, ReadReplicaInfo> readReplica : topologyService.readReplicas().members().entrySet()) {
        ReadReplicaInfo readReplicaInfo = readReplica.getValue();
        endpoints.add(new ReadWriteEndPoint(readReplicaInfo.connectors(), Role.READ_REPLICA, readReplica.getKey().getUuid(), asList(readReplicaInfo.groups())));
    }
    endpoints.sort(comparing(o -> o.addresses().toString()));
    return map((endpoint) -> new Object[] { endpoint.memberId().toString(), endpoint.addresses().uriList().stream().map(URI::toString).toArray(), endpoint.role().name(), endpoint.groups() }, asRawIterator(endpoints.iterator()));
}