如何使用Spring Kafka的Acknowledgement.acknowledge()方法进行手动提交

Question

我使用Spring卡夫卡第一次,我无法使用手动这里提到犯在我的消费者的代码Acknowledgement.acknowledge()方法https://docs.spring.io/spring-kafka/reference/html/_reference. html#commititting-offsets.我的是春季启动应用程序.如果我没有使用手动提交过程,那么我的代码工作正常.但是当我使用Acknowledgement.acknowledge()进行手动提交时,它会显示与bean相关的错误.此外,如果我没有正确使用手动提交,请建议我正确的方法.

错误信息:

***************************
APPLICATION FAILED TO START
***************************

Description:

Field ack in Receiver required a bean of type 'org.springframework.kafka.support.Acknowledgment' that could not be found.


Action:

Consider defining a bean of type 'org.springframework.kafka.support.Acknowledgment' in your configuration.

我搜索了这个错误,我发现我需要添加@Component,但这已经存在于我的消费者代码中.

我的消费者代码如下所示:Receiver.java

import java.util.concurrent.CountDownLatch;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.kafka.annotation.KafkaListener;
import org.springframework.kafka.support.Acknowledgment;
import org.springframework.stereotype.Component;

@Component
public class Receiver {

    @Autowired
    public Acknowledgment ack;

    private CountDownLatch latch = new CountDownLatch(1);

    @KafkaListener(topics = "${kafka.topic.TestTopic}")
    public void receive(ConsumerRecord<?, ?> consumerRecord){
            System.out.println(consumerRecord.value());
            latch.countDown();
            ack.acknowledge();
    }
}

我的生产者代码如下所示:Sender.java

import java.util.Map;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.stereotype.Component;

@Component
public class Sender {

    @Autowired
    private KafkaTemplate<String, Map<String, Object>> kafkaTemplate;

    public void send(Map<String, Object> map){
            kafkaTemplate.send("TestTopic", map);

    }

}

编辑1:

我的新消费者代码如下所示:Receiver.java

import java.util.concurrent.CountDownLatch;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.springframework.kafka.annotation.KafkaListener;
import org.springframework.kafka.support.Acknowledgment;
import org.springframework.stereotype.Component;

@Component
public class Receiver {

    private CountDownLatch latch = new CountDownLatch(1);

    @KafkaListener(topics = "${kafka.topic.TestTopic}", containerFactory = "kafkaManualAckListenerContainerFactory")
    public void receive(ConsumerRecord<?, ?> consumerRecord, Acknowledgment ack){
            System.out.println(consumerRecord.value());
            latch.countDown();
            ack.acknowledge();
    }
}

我也更改了我的配置类:

import java.util.HashMap;
import java.util.Map;

import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.common.serialization.StringDeserializer;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.kafka.annotation.EnableKafka;
import org.springframework.kafka.config.ConcurrentKafkaListenerContainerFactory;
import org.springframework.kafka.core.ConsumerFactory;
import org.springframework.kafka.core.DefaultKafkaConsumerFactory;

@Configuration
@EnableKafka
public class ReceiverConfig {

    @Value("${kafka.bootstrap-servers}")
    private String bootstrapServers;

    @Value("${spring.kafka.consumer.group-id}")
    private String consumerGroupId;

    @Bean
    public Map<String, Object> consumerConfigs() throws SendGridException {
            Map<String, Object> props = new HashMap<>();
            props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
            props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
            props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
            props.put(ConsumerConfig.GROUP_ID_CONFIG, consumerGroupId);
            return props;

    }

    @Bean
    public ConsumerFactory<String, String> consumerFactory(){
        return new DefaultKafkaConsumerFactory<>(consumerConfigs());
    }

    /*@Bean
    public ConcurrentKafkaListenerContainerFactory<String, String> kafkaListenerContainerFactory(){
        ConcurrentKafkaListenerContainerFactory<String, String> factory = new ConcurrentKafkaListenerContainerFactory<>();
        factory.setConsumerFactory(consumerFactory());

        return factory;
    }*/

    @Bean
    public ConcurrentKafkaListenerContainerFactory<String, String> kafkaManualAckListenerContainerFactory(){
        ConcurrentKafkaListenerContainerFactory<String, String> factory = new ConcurrentKafkaListenerContainerFactory<>();
        factory.setConsumerFactory(consumerFactory());
        return factory;
    }

    @Bean
    public Receiver receiver() {
        return new Receiver();
    }
}

将containerFactory ="kafkaManualAckListenerContainerFactory"添加到我的receive()方法后,我收到以下错误.

***************************
APPLICATION FAILED TO START
***************************

Description:

Parameter 1 of method kafkaListenerContainerFactory in org.springframework.boot.autoconfigure.kafka.KafkaAnnotationDrivenConfiguration required a bean of type 'org.springframework.kafka.core.ConsumerFactory' that could not be found.
    - Bean method 'kafkaConsumerFactory' in 'KafkaAutoConfiguration' not loaded because @ConditionalOnMissingBean (types: org.springframework.kafka.core.ConsumerFactory; SearchStrategy: all) found bean 'consumerFactory'


Action:

Consider revisiting the conditions above or defining a bean of type 'org.springframework.kafka.core.ConsumerFactory' in your configuration.

Answer 1

对于那些仍在寻找有关手动确认的这些错误的解决方案的人，您无需指定 containerFactory = "kafkaManualAckListenerContainerFactory"，而只需添加：

factory.getContainerProperties().setAckMode(ContainerProperties.AckMode.MANUAL_IMMEDIATE);

在您返回工厂对象之前到您的接收器配置。

那么你还需要：

props.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, false);

在消费者配置道具中。

所以最后你的监听器方法可以简单地看起来像：

@KafkaListener(topics = "${spring.kafka.topic}")
    private void listen(@Payload String payload, Acknowledgment acknowledgment) {
        //Whatever code you want to do with the payload
        acknowledgement.acknowledge(); //or even pass the acknowledgment to a different method and acknowledge even later
    }

Answer 2

那些使用 Spring Boot 应用程序的人，只需将以下内容添加到您的 application.yml （或特定于环境的文件）中。

spring:
  kafka:
    listener:
      ack-mode: manual

上述更改将使Acknowledgment ack参数在
receive(ConsumerRecord<?, ?> consumerRecord, Acknowledgment ack)方法内部自动可用。

Answer 3

你真的应该遵循文档:

使用手册时AckMode,听众也可以提供Acknowledgment; 此示例还说明了如何使用不同的容器工厂.

@KafkaListener(id = "baz", topics = "myTopic",
          containerFactory = "kafkaManualAckListenerContainerFactory")
public void listen(String data, Acknowledgment ack) {
    ...
    ack.acknowledge();
}

真的没有注意到Acknowledgment是豆子.因此,receive() @KafkaListener适当地更改您的方法签名并删除@Autowired可疑 Acknowledgmentbean - 它只是不存在,因为此对象是每个收到的消息的一部分(标题).