java Apache Kafka不使用api
kafka console producer的console命令。sh和卡夫卡控制台消费者。sh功能正常,但当我尝试使用api生产或消费时,我无法!有人能告诉我我的scala代码是否有问题吗
import java.util.Properties
import org.apache.kafka.clients.producer.{KafkaProducer, ProducerRecord}
object ScalaProducerExample {
val topic = "test"
val brokers = "<broker>:9092"
val props = new Properties()
props.put("bootstrap.servers", brokers)
props.put("client.id", "ScalaProducerExample")
props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer")
props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer")
val producer = new KafkaProducer[String, String](props)
val data = new ProducerRecord[String, String](topic, "message")
producer.send(data)
producer.close()
}
这是在构建中加载的依赖项。sbt文件:
libraryDependencies += "org.apache.kafka" % "kafka-clients" % "0.8.2.1"
libraryDependencies += "org.apache.kafka" %% "kafka" % "0.10.2.0"
我甚至用Java编写了它,同样的情况也在发生
import org.apache.kafka.clients.ClientRequest;
import org.apache.kafka.clients.ClientResponse;
import org.apache.kafka.clients.KafkaClient;
import org.apache.kafka.clients.RequestCompletionHandler;
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.Producer;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.apache.kafka.common.Node;
import org.apache.kafka.common.requests.AbstractRequest;
import java.io.IOException;
import java.util.Date;
import java.util.List;
import java.util.Properties;
import java.util.Random;
public class ProducerExample {
public static void main(String[] args) {
String topic = "test";
String brokers = "<broker>:9092";
System.out.println("init " );
Properties props = new Properties();
props.put("bootstrap.servers", brokers);
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");
System.out.println("creating prducer " );
KafkaProducer<String, String> producer = new KafkaProducer<String, String>(props);
producer.flush();
producer.send(new ProducerRecord<>(topic, "1", "2"));
producer.close();
System.out.println("close " );
}
}
依赖项是内置的。sbt是:
libraryDependencies += "org.apache.kafka" % "kafka-clients" % "0.8.2.1"
我知道连接是有效的,因为当我更改代理时,我收到一个错误。但是当代理正确时,程序会成功运行,但我没有收到任何消息
更新:我假设程序成功运行的原因是它给出了超时。 这是我做的
try {
producer.send(new ProducerRecord<>(topic, "1", "2")).get(30, TimeUnit.SECONDS);
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
} catch (TimeoutException e) {
e.printStackTrace();
}
得到了这个错误:
java.util.concurrent.TimeoutException: Timeout after waiting for 30000 ms.
at org.apache.kafka.clients.producer.internals.FutureRecordMetadata.get(FutureRecordMetadata.java:64)
at org.apache.kafka.clients.producer.internals.FutureRecordMetadata.get(FutureRecordMetadata.java:25)
at de.innocow.kafka.ProducerExample.main(ProducerExample.java:45)
我如何调试更多内容并调查制作者不发送的原因
# 1 楼答案
试试这个,看看Docs: