Question

我的 Spring boot 2.4.1 在 localhost (192.168.189.115) 中运行，kafka 2.13-2.6.0 在 192.168.48.54:9092 中运行

我可以通过 http://localhost:8010/kafka/publish?message=HelloKafka 成功向生产者 kafka 发布消息。

但是消费者得到错误连接到节点-1 (/192.168.48.54:9092) 无法建立。经纪人可能不可用。

我尝试更改 server.properties

listeners=PLAINTEXT://192.168.48.54:9092
advertised.listeners=PLAINTEXT://192.168.48.54:9092

或（也都评论了）

listeners=PLAINTEXT://:9092
advertised.listeners=PLAINTEXT://192.168.48.54:9092

application.properties

server.port=8010
spring.kafka.bootstrap-servers=192.168.48.54:9092
spring.kafka.consumer.group-id=fm-group

KafKaController.java

@RestController
@RequestMapping(value = "/kafka")
public class KafkaController {
    
    @Autowired
    private Producer producer;

    @GetMapping(value = "/publish")
    public void sendMessageToKafkaTopic(@RequestParam("message") String message) {
        this.producer.produce(message);
    }
    
}

Producer.java

@Service
public class Producer {
    
    private static final Logger logger = LogManager.getFormatterLogger(Producer.class);
    private static String TOPIC = "customer.topic";

    @Autowired
    private KafkaTemplate<String, String> kafkaTemplate;

    public void produce(String data) {
        logger.info("Produce Topic: %s - Message: %s", TOPIC, data);
        this.kafkaTemplate.send(TOPIC, data);
    }
    
}

Consumer.java

@Service
public class Consumer {
    
    private static final Logger logger = LogManager.getFormatterLogger(Consumer.class);

    @KafkaListener(topics = "customer.topic", groupId = "fm-group")
    public void consume(String message) throws IOException {
        logger.info("Consume Message: %s", message);
    }
    
}

在 kafka 服务器中，我可以 ping 我的 ip (192.168.189.115)。我不知道为什么不能建立消费者。我已经在 stackoverflow 中尝试了所有分辨率。请帮帮我。

EDIT#1 我将 Producer.java 更改为

public void produce(String data) {
        logger.info("Produce Topic: %s - Message: %s", TOPIC, data);              
        try {
            ListenableFuture<SendResult<String, String>> future = this.kafkaTemplate.send(TOPIC, data);
            logger.info("test");
            SendResult<String, String> sendResult = future.get(10, TimeUnit.SECONDS);
            logger.info("sendResult ", sendResult.getRecordMetadata());
        } catch (InterruptedException e) {
            e.printStackTrace();
            Thread.currentThread().interrupt();
        } catch (ExecutionException e) {
            e.printStackTrace();
        } catch (TimeoutException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

我收到消息回复

org.apache.kafka.common.errors.TimeoutException: Topic customer.topic not present in metadata after 60000 ms.

org.springframework.kafka.KafkaException: Send failed; nested exception is org.apache.kafka.common.errors.TimeoutException: Topic customer.topic not present in metadata after 60000 ms.

看来我也不能发送消息。为什么我无法连接？请帮帮我

我使用 ./bin/kafka-topics.sh --bootstrap-server localhost:9092 --describe

Topic: customer.topic   PartitionCount: 1       ReplicationFactor: 1    Configs: segment.bytes=1073741824
        Topic: customer.topic   Partition: 0    Leader: 0       Replicas: 0     Isr: 0
Topic: streams-wordcount-output PartitionCount: 1       ReplicationFactor: 1    Configs: cleanup.policy=compact,segment.bytes=1073741824

EDIT#2 我也按照建议将它放在 pom.xml 中 org.apache.kafka.common.errors.TimeoutException: Topic not present in metadata after 60000 ms

但是还是不行

<dependency>
       <groupId>com.fasterxml.jackson.core</groupId>
       <artifactId>jackson-databind</artifactId>
    </dependency>
    <dependency>
       <groupId>com.fasterxml.jackson.core</groupId>
       <artifactId>jackson-core</artifactId>
    </dependency>

Answer 1

你不应该绑定到一个实际的 IP，因为这会限制流量只到那个地址

这会打开服务器以接受端口 9092 上的所有传入连接

listeners=PLAINTEXT://0.0.0.0:9092

Answer 2

最后是网络问题。 192.168.48.54 上的 firewalld 已打开，我需要禁用它。

spring-kafka 无法建立到节点 -1 (/192.168.xx.xx:9092) 的连接。经纪人可能不可用

2 个答案: