kafka.common.FailedToSendMessageException: Failed to send messages after 3 tries. 最无语的配置

注意: 本文不谈废话，低级问题请自行检查。

我使用Java版本的Kafka Producer生产数据，但是抛出了这个异常。百思不得其解，明明防火墙配置，ZooKeeper，Kafka配置都是没问题的啊。

困扰了我一天，最终发现这样一个问题:  kafka.common.FailedToSendMessageException: Failed to send messages after 3 tries.

Kafka的server.properties文件中IP不能写主机名，必须写IP地址而不能写映射后的主机名.

如果你在这写的是hostname,例如bigdata:

跑一个Producer程序，你就会喜提Exception:

但是如果改成IP地址:

程序就能正常运行:

我用的版本是Kafka 0.8 ，果然版本低还是BUG太多。浪费了不少时间。

我的生产者代码:

import kafka.javaapi.producer.Producer;
import kafka.producer.KeyedMessage;
import kafka.producer.ProducerConfig;

import java.util.Date;
import java.util.Properties;
import java.util.Random;

public class TestProducer {
    public static void main(String[] args) {
        long events = 10;
        Random rnd = new Random();

        Properties props = new Properties();
        props.put("metadata.broker.list", "192.168.29.132:9092");
        props.put("serializer.class", "kafka.serializer.StringEncoder");
        props.put("partitioner.class", "SimplePartitioner");
        props.put("request.required.acks", "1");

        ProducerConfig config = new ProducerConfig(props);

        Producer<String, String> producer = new Producer<String, String>(config);

        for (long nEvents = 0; nEvents < events; nEvents++) {
               long runtime = new Date().getTime();
               String ip = "192.168.2." + rnd.nextInt(255);
               String msg = runtime + ",www.example.com," + ip;
               KeyedMessage<String, String> data = new KeyedMessage<String, String>("advClickStreamTopic", ip, msg);
               producer.send(data);
        }
        producer.close();
    }
}

import kafka.producer.Partitioner;
import kafka.utils.VerifiableProperties;

public class SimplePartitioner implements Partitioner {
    public SimplePartitioner (VerifiableProperties props) {

    }

    public int partition(Object key, int a_numPartitions) {
        int partition = 0;
        String stringKey = (String) key;
        int offset = stringKey.lastIndexOf('.');
        if (offset > 0) {
           partition = Integer.parseInt( stringKey.substring(offset+1)) % a_numPartitions;
        }
       return partition;
  }

}

我在JIRA上并没找到相关BUG。....  只能说有点坑

版本信息:

     <dependency>
            <groupId>org.scala-lang</groupId>
            <artifactId>scala-reflect</artifactId>
            <version>2.10.0</version>
        </dependency>
        <dependency>
            <groupId>org.scala-lang</groupId>
            <artifactId>scala-library</artifactId>
            <version>2.9.2-RC3</version>
        </dependency>

        <dependency>
            <groupId>org.apache.kafka</groupId>
            <artifactId>kafka_2.9.2</artifactId>
            <version>0.8.1.1</version>
            <scope>compile</scope>
            <exclusions>
                <exclusion>
                    <artifactId>jmxri</artifactId>
                    <groupId>com.sun.jmx</groupId>
                </exclusion>
                <exclusion>
                    <artifactId>jms</artifactId>
                    <groupId>javax.jms</groupId>
                </exclusion>
                <exclusion>
                    <artifactId>jmxtools</artifactId>
                    <groupId>com.sun.jdmk</groupId>
                </exclusion>
            </exclusions>
        </dependency>