Kafka Producer似乎无法正常工作

时间:2017-04-17 21:31:10

标签: java apache-kafka kafka-producer-api

我有一个Kafka制作人,我用Java编写过。尽管它基本上是示例代码的剪切和过去,但它似乎不能正常工作。我希望输出为我的群集的10条消息。相反,我得到消息成功输出但实际上没有任何内容进入我的群集。我不知道从哪里开始排除故障。

import java.util.Properties;
import org.apache.kafka.clients.producer.Producer;
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerRecord;

public class SimpleProducer {

 public static void main(String[] args) throws Exception{

    String topicName = "test_topic";
    Properties props = new Properties();
    props.put("bootstrap.servers", "skynet.local:6667");    
    props.put("acks", "all");
    props.put("retries", 0);
    props.put("batch.size", 16384);   
    props.put("linger.ms", 1);   
    props.put("buffer.memory", 33554432);
    props.put("key.serializer","org.apache.kafka.common.serialization.StringSerializer");
    props.put("value.serializer","org.apache.kafka.common.serialization.StringSerializer");

    Producer<String, String> producer = new KafkaProducer<String, String>(props);

    for(int i = 0; i < 10; i++)
       producer.send(new ProducerRecord<String, String>(topicName, Integer.toString(i), Integer.toString(i)));
       System.out.println("Message sent successfully");
       producer.close();
 }
}

1 个答案:

答案 0 :(得分:2)

由于某些环境未清除,因此我将尝试回答您的问题,因为您的Kafka服务器已在使用端口6667。

您的代码可能需要在2个位置进行调整(有人可以帮我改进):

props.put("linger.ms", 1); // set to 0 let Producer can send message immediately

在这里,从producer.close();循环中删除for

 Producer<String, String> producer = new KafkaProducer<String, String>(props, new StringSerializer(), new StringSerializer());
 for(int i = 0; i < 10; i++) {
   Future<RecordMetadata> f = producer.send(new ProducerRecord<String, String>(topicName, Integer.toString(i), Integer.toString(i)));
   System.out.println(f.get()); // don't do that in your Production, here just for debugging purpose.
 }
 producer.close();

还有一件事,您可以在测试之前运行kafka-console-consumer.shkafka-console-producer.sh以确认您的Kafka服务器并且您的SimpleProducer已经正常运行。 Kafka Producer Configuration Parameters

处的Kafka 0.10.x配置参数