java - PoolingOptions 和 Cassandra - java

Question

我正在使用 datastax 驱动程序将 Cassandra 用作 Apache Flink 的某些数据流的接收器:我在执行应用程序时遇到问题，在运行时引发有关队列在几秒钟后变满的错误。我发现默认值是 256，这对于我的负载来说可能太低，因此我使用 poolingOptions 设置 maxRequestsPerConnection 来提高它，如下所示:http://docs.datastax.com/en/developer/java-driver/3.1/manual/pooling/ .

不幸的是，使用以下代码时，我在启动它时收到以下错误:

The implementation of the ClusterBuilder is not serializable. 
The object probably contains or references non serializable fields.

我的代码:

PoolingOptions poolingOptions = new PoolingOptions();
    poolingOptions
      .setMaxRequestsPerConnection(HostDistance.LOCAL, 32768)
      .setMaxRequestsPerConnection(HostDistance.REMOTE, 10000);


ClusterBuilder cassandraBuilder = new ClusterBuilder() {

    @Override
    public Cluster buildCluster(Cluster.Builder builder) {
        return builder.addContactPoint(CASSANDRA_ADDRESS)
                      .withPort(CASSANDRA_PORT)
                      .withPoolingOptions(poolingOptions)
                      .build();
    }
};

sinkBuilderNormalStream
    .setQuery("INSERT INTO keyspace_local.values_by_sensors_users"
        + " (user, sensor, timestamp, rdf_stream, observed_value, value)"
        + " VALUES (?, ?, ?, ?, ?, ?);")
    .setClusterBuilder(cassandraBuilder)
    .build();

我该如何处理？

Answer 1

您必须在 ClusterBuilder#buildCluster 中定义 PoolingOptions。