卡夫卡Java消费者从来没有收到任何消息

Question

我试图安装一个基本Java消费者收到的消息，从卡夫卡的主题。我已经跟随样品在- https://cwiki.apache.org/confluence/display/KAFKA/Consumer+Group+Example -和这个代号：

package org.example.kafka.client;

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import kafka.consumer.ConsumerConfig;
import kafka.consumer.KafkaStream;
import kafka.javaapi.consumer.ConsumerConnector;

public class KafkaClientMain 
{

    private final ConsumerConnector consumer;
    private final String topic;
    private  ExecutorService executor;  


    public KafkaClientMain(String a_zookeeper, String a_groupId, String a_topic) 
    {
        this.consumer = kafka.consumer.Consumer.createJavaConsumerConnector(
                createConsumerConfig(a_zookeeper, a_groupId));

        this.topic = a_topic;
    }    


    private static ConsumerConfig createConsumerConfig(String a_zookeeper, String a_groupId) {
        Properties props = new Properties();
        props.put("zookeeper.connect", a_zookeeper);
        props.put("group.id", a_groupId);
        props.put("zookeeper.session.timeout.ms", "1000");
        props.put("zookeeper.sync.time.ms", "1000");
        props.put("auto.commit.interval.ms", "1000");
        props.put("auto.offset.reset", "smallest");

        return new ConsumerConfig(props);
    }    

    public void shutdown() {
        if (consumer != null) consumer.shutdown();
        if (executor != null) executor.shutdown();
    }    


    public void run(int a_numThreads) {
        Map<String, Integer> topicCountMap = new HashMap<String, Integer>();
        topicCountMap.put(topic, new Integer(a_numThreads));
        Map<String, List<KafkaStream<byte[], byte[]>>> consumerMap = consumer.createMessageStreams(topicCountMap);
        List<KafkaStream<byte[], byte[]>> streams = consumerMap.get(topic);

        System.out.println( "streams.size = " + streams.size() );

        // now launch all the threads
        //
        executor = Executors.newFixedThreadPool(a_numThreads);

        // now create an object to consume the messages
        //
        int threadNumber = 0;
        for (final KafkaStream stream : streams) {
            executor.submit(new ConsumerTest(stream, threadNumber));
            threadNumber++;
        }
    }    


    public static void main(String[] args) 
    {


        String zooKeeper = "ec2-whatever.compute-1.amazonaws.com:2181";
        String groupId = "group1";
        String topic = "test";

        int threads = 1;

        KafkaClientMain example = new KafkaClientMain(zooKeeper, groupId, topic);

        example.run(threads);

    }

}

和

package org.example.kafka.client;

import kafka.consumer.ConsumerIterator;
import kafka.consumer.KafkaStream;

public class ConsumerTest implements Runnable 
{

    private KafkaStream m_stream;
    private int m_threadNumber;

    public ConsumerTest(KafkaStream a_stream, int a_threadNumber) 
    {
        m_threadNumber = a_threadNumber;
        m_stream = a_stream;
    }

    public void run() 
    {
        System.out.println( "calling ConsumerTest.run()" );
        ConsumerIterator<byte[], byte[]> it = m_stream.iterator();

        while (it.hasNext())
        {    
            System.out.println("Thread " + m_threadNumber + ": " + new String(it.next().message()));
        }


        System.out.println("Shutting down Thread: " + m_threadNumber);
    }
}

卡夫卡上运行的EC2主在的问题，我可以发送和接收信息的题目是"测试"使用kafka-console-producer.sh 和kafka-console-consumer.sh 工具。口2181是开放的，可以从计算机的消费者运行(并因此是9092良好的措施，但这似乎并没有对帮助或者)。

不幸的是，我从来没有收到任何消息在我的消费者当我运行这一点。既不现有信息的主题，也不是新发送消息，我发送的使用kafka-console-producer.sh，而消费者的运行。

这是使用卡夫卡0.8.1.1上运行CentOS6.4 64，使用们可根据最新的技术提供一些1.7.0_65.

编辑：总的来说，在消费者节目开始时，我看见这个动物园管理员输出：

[2014-08-01 15:56:38,045] INFO Accepted socket connection from /98.101.159.194:24218 (org.apache.zookeeper.server.NIOServerCnxn)
[2014-08-01 15:56:38,049] INFO Client attempting to establish new session at /98.101.159.194:24218 (org.apache.zookeeper.server.NIOServerCnxn)
[2014-08-01 15:56:38,053] INFO Established session 0x1478e963fb30008 with negotiated timeout 6000 for client /98.101.159.194:24218 (org.apache.zookeeper.server.NIOServerCnxn)

任何想法可能是什么会在这?任何和所有帮助非常赞赏。

Answer 1

回答这个我自己的子孙后代，情况下，任何人在类似的问题。

问题是这样的：卡夫卡的经纪人和动物园管理员在一个EC2节点，以及消费者对我的笔记本电脑上运行。当连接到动物园管理员，客户越来越交给一个参考"ip-10-0-x-x。ec2。内部的"，这不能解决(默认)从外EC2。这变得清楚一旦我正确配置log4j上的客户，所以我得到了所有的日志的信息。

的解决方法是只要放一条在我的/etc/主机文件，映射ec2内部主机名称的公路由的IP地址。

Answer 2

你可以解决这个问题使用设置下列财产在服务器。性文件落在卡夫卡的配置文件夹

广告。主机。name=公共dns的Ec2服务器