手动确认消息:Spring Cloud Stream Kafka [英] Manual Acknowledgement of Messages : Spring Cloud Stream Kafka

问题描述

我要实现的方案是消耗来自Kafka的消息，对其进行处理，如果某些条件失败，我不希望确认该消息.为此，我在Spring Cloud Stream参考文档中找到了

The scenario i want to implement is consume a message from Kafka , process it, if some condition fails i do not wish to acknowledge the message. For this i found in the spring cloud stream reference documentation,

autoCommitOffset处理消息后是否自动提交偏移量.如果设置为false，则消息头中将提供一个Acknowledgment标头，以供以后确认.

autoCommitOffset Whether to autocommit offsets when a message has been processed. If set to false, an Acknowledgment header will be available in the message headers for late acknowledgment.

默认:true.

我的问题是将autoCommitOffset设置为false后，如何确认消息?一个代码示例将不胜感激.

My question is after setting autoCommitOffset to false, how can i acknowledge a message? A Code example would be hugely appreciated.

推荐答案

我在从本质上讲，它取决于设置spring.cloud.stream.kafka.bindings.input.consumer.autoCommitOffset = false

Essentially it comes down to setting spring.cloud.stream.kafka.bindings.input.consumer.autoCommitOffset=false

，然后处理确认标头:

@SpringBootApplication
@EnableBinding(Sink.class)
   public class ManuallyAcknowdledgingConsumer {

      public static void main(String[] args) {
         SpringApplication.run(ManuallyAcknowdledgingConsumer.class, args);
      }

      @StreamListener(Sink.INPUT)
      public void process(Message<?> message) {
         System.out.println(message.getPayload());
         Acknowledgment acknowledgment = message.getHeaders().get(KafkaHeaders.ACKNOWLEDGMENT, Acknowledgment.class);
        if (acknowledgment != null) {
           System.out.println("Acknowledgment provided");
           acknowledgment.acknowledge();
        }
    }
}

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