我会建议你第三个,但有两个主题:1为请求和1为响应。这是一个例子:
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 java.util.concurrent.TimeUnit;
import kafka.consumer.ConsumerConfig;
import kafka.consumer.ConsumerIterator;
import kafka.consumer.KafkaStream;
import kafka.javaapi.consumer.ConsumerConnector;
import kafka.javaapi.producer.Producer;
import kafka.producer.KeyedMessage;
import kafka.producer.ProducerConfig;
public class ConsumerGroupExample extends Thread {
private final ConsumerConnector consumer;
private final String topic;
private ConsumerIterator<byte[], byte[]> it;
private String mensaje="";
public ConsumerGroupExample(Properties props, String a_topic)
{
consumer = kafka.consumer.Consumer.createJavaConsumerConnector(new ConsumerConfig(props));
this.topic = a_topic;
Map<String, Integer> topicCountMap = new HashMap<String, Integer>();
topicCountMap.put(topic, 1);
Map<String, List<KafkaStream<byte[], byte[]>>> consumerMap = consumer.createMessageStreams(topicCountMap);
List<KafkaStream<byte[], byte[]>> streams = consumerMap.get(topic);
KafkaStream stream = streams.get(0);
it = stream.iterator();
}
public void shutdown()
{
if (consumer != null) consumer.shutdown();
}
public void run()
{
if (it.hasNext())
{
mensaje = new String(it.next().message());
}
System.out.println(mensaje);
}
public String getMensaje()
{
return this.mensaje;
}
public static void main(String[] args) {
Properties props = new Properties();
props.put("zookeeper.connect", "localhost:2181");
props.put("group.id", "Group");
props.put("zookeeper.session.timeout.ms", "400");
props.put("zookeeper.sync.time.ms", "200");
props.put("auto.commit.interval.ms", "1000");
props.put("consumer.timeout.ms", "10000");
ConsumerGroupExample example = new ConsumerGroupExample(props, "topicFoRResponse");
props = new Properties();
props.put("metadata.broker.list", "localhost:9092");
props.put("serializer.class", "kafka.serializer.StringEncoder");
props.put("request.required.acks", "1");
ProducerConfig config = new ProducerConfig(props);
example.start();
try {
Producer<String, String> colaParaEscritura;
KeyedMessage<String, String> data = new KeyedMessage<String, String>("topicForRequest", " message ");
colaParaEscritura = new kafka.javaapi.producer.Producer<String, String>(config);
colaParaEscritura.send(data);
System.out.println("enviado");
colaParaEscritura.close();
example.join();
System.out.println("final"+ example.getMensaje());
}
catch (InterruptedException ie) {
}
example.shutdown();
}
}
请在这里概述代码。 – Adriaan
这听起来与我在原始问题中列出的第三种方法类似。这不会压倒Zookeeper(跟踪主题的实用程序)吗?通过这种方法,卡夫卡和Zookeeper似乎在做同样的工作量,而通常Zookeeper的占地面积很小。 – user554481
是的,这可能会压倒服务器,因为删除的主题不会立即从Kafka服务器中消失......我只是在其他答案中发布新方法。 –