我有一个kafka代理，有多个主题，每个主题都有一个分区。
我有一个消费者，它可以很好地使用主题中的消息
我的问题是我需要通过增加分区的数量来提高消息队列的吞吐量，比如说我在一个主题上有四个分区，有没有一种方法可以让我写四个消费者，每个消费者都指向主题上的各个分区？？？

import java.util.*;
import kafka.consumer.Consumer;
import kafka.consumer.ConsumerConfig;
import kafka.consumer.ConsumerIterator;
import kafka.consumer.KafkaStream;
import kafka.javaapi.consumer.ConsumerConnector;

public class KafkaConsumer {
   private ConsumerConnector consumerConnector = null;
   private final String topic = "mytopic";

   public void initialize() {
         Properties props = new Properties();
         props.put("zookeeper.connect", "localhost:2181");
         props.put("group.id", "testgroup");
         props.put("zookeeper.session.timeout.ms", "400");
         props.put("zookeeper.sync.time.ms", "300");
         props.put("auto.commit.interval.ms", "1000");
         ConsumerConfig conConfig = new ConsumerConfig(props);
         consumerConnector = Consumer.createJavaConsumerConnector(conConfig);
   }

   public void consume() {
         //Key = topic name, Value = No. of threads for topic
         Map<String, Integer> topicCount = new HashMap<String, Integer>();       
         topicCount.put(topic, new Integer(1));

         //ConsumerConnector creates the message stream for each topic
         Map<String, List<KafkaStream<byte[], byte[]>>> consumerStreams =
               consumerConnector.createMessageStreams(topicCount);         

         // Get Kafka stream for topic 'mytopic'
         List<KafkaStream<byte[], byte[]>> kStreamList =
                                              consumerStreams.get(topic);
         // Iterate stream using ConsumerIterator
         for (final KafkaStream<byte[], byte[]> kStreams : kStreamList) {
                ConsumerIterator<byte[], byte[]> consumerIte = kStreams.iterator();

                while (consumerIte.hasNext())
                       System.out.println("Message consumed from topic
                                     [" + topic + "] : "       +
                                       new String(consumerIte.next().message()));              
         }
         //Shutdown the consumer connector
         if (consumerConnector != null)   consumerConnector.shutdown();          
   }

   public static void main(String[] args) throws InterruptedException {
         KafkaConsumer kafkaConsumer = new KafkaConsumer();
         // Configure Kafka consumer
         kafkaConsumer.initialize();
         // Start consumption
         kafkaConsumer.consume();
   }

}