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Exception in thread "Thread-0" kafka.common.FailedToSendMessageException: Failed to send messages after 3 tries.
at kafka.producer.async.DefaultEventHandler.handle(DefaultEventHandler.scala:90)
at kafka.producer.Producer.send(Producer.scala:76)
at kafka.javaapi.producer.Producer.send(Producer.scala:33)
at its.kafka.Producer.run(Producer.java:46)

import java.util.Properties;
import kafka.producer.KeyedMessage;
import kafka.producer.ProducerConfig;

public class Producer extends Thread{
    private final kafka.javaapi.producer.Producer<Integer, String> producer;
    private final String topic;
    private final String name;
    private final int numsOfMessage;
    private final Properties props = new Properties();

    public Producer(String name,String topic,int numsOfMessage){
        props.put("serializer.class", "kafka.serializer.StringEncoder");
        props.put("metadata.broker.list", "10.0.30.221:9092");
        //异步发送
        //props.put("producer.type", "async");
        //每次发送多少条
        //props.put("batch.num.messages", "100");
        producer = new kafka.javaapi.producer.Producer<Integer, String>(new ProducerConfig(props));
        this.topic = topic;
        this.name = name;
        this.numsOfMessage = numsOfMessage;
    }
  
      public void run() {
          int messageNo = 1;
          while(messageNo <= numsOfMessage) { //每个生产者生产的消息数；
              String message = new String(name+"‘s    Message_" + messageNo+"******");
              KeyedMessage<Integer, String> messageForSend = new KeyedMessage<Integer, String>(topic, message);
              producer.send(messageForSend);
              messageNo++;
          }
          producer.close();
     }
}

import java.util.concurrent.TimeUnit;

public class KafkaProducerDemo implements KafkaProperties{ 
    public static void main(String[] args){
        StartThread(1,"testTopic",10);
    }
    /**
     * @param numsOfProducer  生产者的数目
     * @param topic        消息的主题
     * @param numsOfMessage    每个生产者生产的消息树
     * @return 
     */
    public static void StartThread(int numsOfProducer,String topic,int numsOfMessage){
        for(int i = 1; i <= numsOfProducer; i ++ ){
            String name = "Producer" + i;
            new Producer(name,topic,numsOfMessage).start();    
        }
    }
}

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import kafka.consumer.ConsumerConfig;
import kafka.consumer.ConsumerIterator;
import kafka.consumer.KafkaStream;
import kafka.javaapi.consumer.ConsumerConnector;


public class Consumer extends Thread {
  private final ConsumerConnector consumer;
  private final String topic;
  private final String name;
  
  public Consumer(String name,String topic){
    consumer = kafka.consumer.Consumer.createJavaConsumerConnector(
            createConsumerConfig());
    this.topic = topic;
    this.name = name;
  }

  private static ConsumerConfig createConsumerConfig(){
    Properties props = new Properties();
    props.put("zookeeper.connect", KafkaProperties.zkConnect);
    props.put("group.id", KafkaProperties.groupId);
    props.put("zookeeper.session.timeout.ms", "60000");
    props.put("zookeeper.sync.time.ms", "200");
    props.put("auto.commit.interval.ms", "1000");
    //每次最少接收的字节数，默认是1
    //props.put("fetch.min.bytes", "1024");
    //每次最少等待时间，默认是100
    //props.put("fetch.wait.max.ms", "600000");
    return new ConsumerConfig(props);
  }
 
  public void run() {
    Map<String, Integer> topicCountMap = new HashMap<String, Integer>();
    topicCountMap.put(topic, new Integer(1));
    Map<String, List<KafkaStream<byte[], byte[]>>> consumerMap = consumer.createMessageStreams(topicCountMap);
    KafkaStream<byte[], byte[]> stream =  consumerMap.get(topic).get(0);
    ConsumerIterator<byte[], byte[]> it = stream.iterator();
    while(it.hasNext()){
        System.out.println("************"+name+"    gets    "+new String(it.next().message()));
    }
  }
}

public class KafkaConsumerDemo implements KafkaProperties
{
  public static void main(String[] args){
    //Consumer1
    Consumer consumerThread1 = new Consumer("Consumer1",KafkaProperties.topic);

    consumerThread1.start();
  }
}

public interface KafkaProperties{
  final static String zkConnect = "10.0.30.221:2181";  
  final static  String groupId = "group1";
  final static String topic = "testTopic";
  final static String kafkaServerURL = "10.0.30.221";
  final static int kafkaServerPort = 9092;
  final static int kafkaProducerBufferSize = 64*1024;
  final static int connectionTimeOut = 100000;
  final static int reconnectInterval = 10000;
  final static String clientId = "SimpleConsumerDemoClient";
}