我是KAFKA的新手,我知道这个问题已经多次被问到堆栈溢出,但没有一个解决方案对我有用,所以我在这里试着再次提出同样的问题 . 我已经在Centos7 VM上下载并安装了KFKA . VM在我的笔记本电脑上 . 当我从命令行运行KAFKA 生产环境 者和消费者时,它工作正常 . 下一步,我想创建一个Java Producer但它总是超时,但有以下异常 .
Exception in thread "main" java.util.concurrent.ExecutionException: org.apache.kafka.common.errors.TimeoutException: Failed to update metadata after 60000 ms.
at org.apache.kafka.clients.producer.KafkaProducer$FutureFailure.<init>(KafkaProducer.java:1186)
at org.apache.kafka.clients.producer.KafkaProducer.doSend(KafkaProducer.java:880)
at org.apache.kafka.clients.producer.KafkaProducer.send(KafkaProducer.java:803)
at org.apache.kafka.clients.producer.KafkaProducer.send(KafkaProducer.java:690)
at com.soft.teradata.KafkaProducerExample.runProducer(KafkaProducerExample.java:40)
at com.soft.teradata.KafkaProducerExample.main(KafkaProducerExample.java:55)
Caused by: org.apache.kafka.common.errors.TimeoutException: Failed to update metadata after 60000 ms.
生产环境 者的Java代码是:
package com.soft;
import java.util.Properties;
import java.util.concurrent.Future;
import org.apache.kafka.clients.producer.Producer;
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.apache.kafka.clients.producer.RecordMetadata;
public class SimpleProducer {
public static void main(String[] args) throws Exception {
try {
String topicName = "Hello-Kafka";
Properties props = new Properties();
props.put("bootstrap.servers", "192.168.xxx.xxx:9092");
props.put("acks", "all");
props.put("retries", 1);
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);
Future<RecordMetadata> f=producer.send(new ProducerRecord<String, String>(topicName, "Eclipse"));
System.out.println("Message sent successfully");
producer.close();
} catch (Exception e) {
System.out.println(e.getMessage());
}
System.out.println("Successful");
}
}
对于bootstrap.server,我甚至尝试了以下内容:
props.put(“bootstrap.servers”,“PLAINTEXT://192.168.xxx.xxx:9092”);
请注意,我正在笔记本电脑上执行Eclipse中的Java代码,而KAFKA安装在笔记本电脑上的CENTOS7 VM上 . 192.168.xxx.xxx是CENTOS7 VM的IP地址 . 我注意到我的笔记本电脑无法访问192.168.xxx.xxx:9092(telnet 192.168.xxx.xxx 9092) . 我将端口添加到防火墙但仍然没有成功 .
firewall-cmd --zone=public --add-port=9092/tcp --permanent
firewall-cmd --reload
firewall-cmd --list-ports
KAFKA的版本是2.12-2.0.0,我在Eclipse Classpath中添加了以下jar:
-
kafka-clients-2.0.0.jar
-
lz4-java-1.4.1.jar
-
slf4j-api-1.7.25.jar
-
snappy-java-1.1.7.1.jar
非常感谢你提前帮助:)
Regadrs,DIRSHAH .