Kafka 生产者连接到本地主机而不是真实 IP

Question

请帮助我想知道为什么 kafka 生产者总是连接到本地主机，但是代理 ip 不是本地主机。那么，有什么帮助吗？有任何想法吗 ？

import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerConfig;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.apache.kafka.common.serialization.StringSerializer;

import java.util.Properties;

public class ProducerDemo {

    public static void main(String[] args) throws Exception{
        String bootstrapServers = "192.168.199.137:9092";

        Properties properties = new Properties();
        properties.setProperty(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
        properties.setProperty(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());
        properties.setProperty(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());

        // create the producer
        KafkaProducer<String, String> producer = new KafkaProducer<String, String>(properties);

        System.out.println("kafka IP   " + properties.getProperty(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG));


        // create producer record
        ProducerRecord<String, String> record = new ProducerRecord<String, String>("first_topic", "Hello world");


        // send data
        producer.send(record);
        producer.flush();
        producer.close();

    }

}

这是 pom 内容

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>KafkaBeginnersCourse</artifactId>
    <version>1.0-SNAPSHOT</version>

    <packaging>jar</packaging>

    <dependencies>
        <!-- https://mvnrepository.com/artifact/org.apache.kafka/kafka-clients -->
        <dependency>
            <groupId>org.apache.kafka</groupId>
            <artifactId>kafka-clients</artifactId>
            <version>2.4.0</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-simple -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-simple</artifactId>
            <version>1.7.28</version>
            <!--scope>test</scope-->
        </dependency>
    </dependencies>
</project>

这是输出控制台的列表

[kafka-producer-network-thread | producer-1] INFO org.apache.kafka.clients.Metadata - [Producer clientId=producer-1] Cluster ID: 0TPD87gWR0G18RLKk4gPow
[kafka-producer-network-thread | producer-1] WARN org.apache.kafka.clients.NetworkClient - [Producer clientId=producer-1] Connection to node 1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available.
[kafka-producer-network-thread | producer-1] WARN org.apache.kafka.clients.NetworkClient - [Producer clientId=producer-1] Connection to node 1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available.
[kafka-producer-network-thread | producer-1] WARN org.apache.kafka.clients.NetworkClient - [Producer clientId=producer-1] Connection to node 1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available.
[kafka-producer-network-thread | producer-1] WARN org.apache.kafka.clients.NetworkClient - [Producer clientId=producer-1] Connection to node 1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available.
[kafka-producer-network-thread | producer-1] WARN org.apache.kafka.clients.NetworkClient - [Producer clientId=producer-1] Connection to node 1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available.
[kafka-producer-network-thread | producer-1] WARN org.apache.kafka.clients.NetworkClient - [Producer clientId=producer-1] Connection to node 1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available.

Answer 1

正如@cricket_007 已经说过的那样，您advertised.listeners在server.properties文件中的设置似乎存在问题。让我试着详细解释一下。

当您的生产者尝试连接 Kafka 代理时，代理将广告主机名发送给客户端以供使用，然后生产者使用此地址连接到代理。所以通常的沟通是这样的：

但是在您的情况下，生产者和经纪人之间的通信是这样的：

PS：您可以将图像中的公共 IP 假设为您的案例的私有 IP。

因此，您应该像这样在 server.properties 中设置您的广告侦听器：

advertised.listeners=PLAINTEXT://192.168.199.137:9092

图片参考：https : //www.udemy.com/course/kafka-cluster-setup/