kafka topicPartitions问题

全栈程序员-站长 • 2022年6月26日上午9:00 • 未分类 • 阅读 21

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当我实现三个消费者去同时消费一个Topic(默认没有分区)消息时,三个消费者同时消费到了同样的消息

现象如下:

2019-06-11 15:30:02.516 [org.springframework.kafka.KafkaListenerEndpointContainer#0-0-C-1] INFO  com.example.kafka.consumer.TestB - ==[cousumerC]==1560238202513====sendTest3===3
2019-06-11 15:30:02.517 [org.springframework.kafka.KafkaListenerEndpointContainer#1-0-C-1] INFO  com.example.kafka.consumer.TestB - ==[cousumerA]==1560238202513====sendTest3===3
2019-06-11 15:30:02.518 [org.springframework.kafka.KafkaListenerEndpointContainer#2-0-C-1] INFO  com.example.kafka.consumer.TestB - ==[cousumerB]==1560238202513====sendTest3===3
2019-06-11 15:30:04.518 [org.springframework.kafka.KafkaListenerEndpointContainer#1-0-C-1] INFO  com.example.kafka.consumer.TestB - ==[cousumerA]==1560238204513====sendTest3===4
2019-06-11 15:30:04.518 [org.springframework.kafka.KafkaListenerEndpointContainer#0-0-C-1] INFO  com.example.kafka.consumer.TestB - ==[cousumerC]==1560238204513====sendTest3===4
2019-06-11 15:30:04.518 [org.springframework.kafka.KafkaListenerEndpointContainer#2-0-C-1] INFO  com.example.kafka.consumer.TestB - ==[cousumerB]==1560238204513====sendTest3===4

消费者

@KafkaListener(groupId = "test2",topicPartitions = { 
   @TopicPartition(topic = "hzl.test.aaa",partitionOffsets = @PartitionOffset(partition = "0",initialOffset = "-1"))})
public void cousumerA(String msg) { 
   
    logger.info("==[cousumerA]==" + msg);
}

@KafkaListener(groupId = "test2",topicPartitions = { 
   @TopicPartition(topic = "hzl.test.aaa",partitionOffsets = @PartitionOffset(partition = "0",initialOffset = "-1"))})
public void cousumerB(String msg) { 
   
    logger.info("==[cousumerB]==" + msg);
}

@KafkaListener(groupId = "test2",topicPartitions = { 
   @TopicPartition(topic = "hzl.test.aaa",partitionOffsets = @PartitionOffset(partition = "0",initialOffset = "-1"))})
public void cousumerC(String msg) { 
   
    logger.info("==[cousumerC]==" + msg);
}

生产者


    @Autowired
    KafkaTemplate kafkaTemplate;

    int i =0;
    @Scheduled(fixedRate = 2000)
    public void sendTest3() { 
   
        kafkaTemplate.send("hzl.test.aaa", System.currentTimeMillis() + "====sendTest3===" + i++);
    }

如果采用如下方式,则只会被消费一次

    @KafkaListener(topics =  "hzl.test.aaa",groupId = "test2",)
    public void cousumerD(String msg) { 
   
        logger.info("==[cousumerD]==" + msg);
    }



    @KafkaListener(topics =  "hzl.test.aaa",groupId = "test2",)
    public void cousumerE(String msg) { 
   
        logger.info("==[cousumerE]==" + msg);
    }


    @KafkaListener(topics =  "hzl.test.aaa",groupId = "test2",)
    public void cousumerF(String msg) { 
   
        logger.info("==[cousumerF]==" + msg);
    }