java - 如何确认 spring kafka 中的当前偏移量以进行手动提交

Question

我是第一次使用 Spring Kafka，我无法在我的消费者代码中使用 Acknowledgement.acknowledge() 方法进行手动提交。如果我的消费者配置或监听器代码中缺少任何内容，请告诉我。或者还有其他方法来根据条件处理确认偏移。 在这里，我正在寻找解决方案，例如如果未手动提交/确认偏移量，它应该由消费者选择相同的消息/偏移量。

配置

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.DefaultKafkaConsumerFactory;
import org.springframework.kafka.listener.AbstractMessageListenerContainer.AckMode;

@EnableKafka
@Configuration
public class ConsumerConfig {

    @Value(value = "${kafka.bootstrapAddress}")
    private String bootstrapAddress;

    @Value(value = "${kafka.groupId}")
    private String groupId;

    @Bean
    public ConcurrentKafkaListenerContainerFactory<String, String> containerFactory() {
        Map<String, Object> props = new HashMap<String, Object>();
        props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapAddress);
        props.put(ConsumerConfig.GROUP_ID_CONFIG, groupId);
        props.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, false);
        props.put(ConsumerConfig.AUTO_COMMIT_INTERVAL_MS_CONFIG, 100);
        props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG,
                StringDeserializer.class);
        props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,
                StringDeserializer.class);
        props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "latest");
        ConcurrentKafkaListenerContainerFactory<String, String> factory = new ConcurrentKafkaListenerContainerFactory<String, String>();
        factory.setConsumerFactory(new DefaultKafkaConsumerFactory<String, String>(
                props));
        factory.getContainerProperties().setAckMode(AckMode.MANUAL_IMMEDIATE);
        factory.getContainerProperties().setSyncCommits(true);
        return factory;
    }
}

监听器

private static int value = 1;

@KafkaListener(id = "baz", topics = "${message.topic.name}", containerFactory = "containerFactory")
public void listenPEN_RE(@Payload String message,
        @Header(KafkaHeaders.RECEIVED_PARTITION_ID) int partition,
        @Header(KafkaHeaders.OFFSET) int offsets,
        Acknowledgment acknowledgment) {

    if (value%2==0){
        acknowledgment.acknowledge();
    }
    value++;
}

Answer 1

将启用自动提交属性设置为 false:

propsMap.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, false);

将确认模式设置为 MANUAL_IMMEDIATE:

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

然后，在您的消费者/监听器代码中，您可以手动提交偏移量，如下所示:

@KafkaListener(topics = "testKafka")
public void receive(ConsumerRecord<?, ?> consumerRecord,  
        Acknowledgment acknowledgment) {

    System.out.println("Received message: ");
    System.out.println(consumerRecord.value().toString());

    acknowledgment.acknowledge();
}

更新:我为此创建了一个小型 POC。看看here ，可能对你有帮助。