SpringKafka-如何重置偏移量到最新与一个组ID？

Question

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

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

public Map<String, Object> getDefaultProperties() {
    Map<String, Object> properties = new HashMap<>();
    properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);

    properties.put(ConsumerConfig.GROUP_ID_CONFIG, consumerGroupId);

    properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
    properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, ByteArrayDeserializer.class);
    return properties;
}

@Bean
public ConcurrentKafkaListenerContainerFactory<String, String> kafkaListenerContainerFactory() {

    ConcurrentKafkaListenerContainerFactory<String, String> factory = new ConcurrentKafkaListenerContainerFactory<>();
    factory.setConsumerFactory(consumerFactory());
    return factory;
}

@Bean
public KafkaMessageListener listener() {
    return new KafkaMessageListener();
}

我想开始最新的抵消，而不是为旧的价值所困扰。是否有可能重置该组的偏移量？

Answer 1

因为我没有看到任何这样的例子，我要解释一下我是怎么做的。

您的@KafKalistener的类必须实现ConsumerSeekAware类，这将允许侦听器在分区被归属时控制偏移量搜索。（来源:https://docs.spring.io/spring-kafka/reference/htmlsingle/#seek)

public class KafkaMessageListener implements ConsumerSeekAware {
    @KafkaListener(topics = "your.topic")
    public void listen(byte[] payload) {
        // ...
    }

    @Override
    public void registerSeekCallback(ConsumerSeekCallback callback) {

    }

    @Override
    public void onPartitionsAssigned(Map<TopicPartition, Long> assignments, ConsumerSeekCallback callback) {
        assignments.forEach((t, o) -> callback.seekToEnd(t.topic(), t.partition()));
    }

    @Override
    public void onIdleContainer(Map<TopicPartition, Long> assignments, ConsumerSeekCallback callback) {


    }
}

这里，在重新平衡时，我们使用给定的回调来为所有给定的主题寻求最后的偏移量。感谢Artem Bilan（https://stackoverflow.com/users/2756547/artem-bilan）指导我找到答案。