Não consigo fazer consultas no nó Cassandra. Eu sou capaz de fazer a conexão com o cluster e conectar. No entanto, ao fazer a consulta, ela falha

Caused by: com.datastax.driver.core.exceptions.NoHostAvailableException: All host(s) tried for query failed (no host was tried)
at com.datastax.driver.core.RequestHandler.reportNoMoreHosts(RequestHandler.java:217)
at com.datastax.driver.core.RequestHandler.access$1000(RequestHandler.java:44)
at com.datastax.driver.core.RequestHandler$SpeculativeExecution.sendRequest(RequestHandler.java:276)
at com.datastax.driver.core.RequestHandler.startNewExecution(RequestHandler.java:117)
at com.datastax.driver.core.RequestHandler.sendRequest(RequestHandler.java:93)
at com.datastax.driver.core.SessionManager.executeAsync(SessionManager.java:127)
... 3 more

É assim que estou me conectando ao cluster:

    List<String> servers = config.getCassandraServers();
    Builder builder = Cluster.builder();
    for (String server : servers) {
        builder.addContactPoints(server);
    }

    PoolingOptions opts = new PoolingOptions();
    opts.setCoreConnectionsPerHost(HostDistance.LOCAL, opts.getCoreConnectionsPerHost(HostDistance.LOCAL));

    // setup socket exceptions
    SocketOptions socketOpts = new SocketOptions();
    socketOpts.setReceiveBufferSize(1048576);
    socketOpts.setSendBufferSize(1048576);
    socketOpts.setTcpNoDelay(false);

    cluster = builder.withSocketOptions(socketOpts)
            .withRetryPolicy(DowngradingConsistencyRetryPolicy.INSTANCE)
            .withPoolingOptions(opts)
            .withReconnectionPolicy(new ConstantReconnectionPolicy(100L))
            .withLoadBalancingPolicy(new DCAwareRoundRobinPolicy(getColo(config)))
            .build();

    cluster.connect();

Estou usando a versão estável mais recente do Cassandra 2.2.3 com o driver Datastax:

<dependency>
        <groupId>com.datastax.cassandra</groupId>
        <artifactId>cassandra-driver-core</artifactId>
        <version>2.1.8</version>
</dependency>

Quaisquer indicadores são muito apreciados

Graças Masti