背景：

对kafka消息进行监听，生产者发了消息，但是消费端没有接到消息，监听代码

消费端，kafka配置

spring.kafka.bootstrap-servers=kafka.cestc.dmp:9591

spring.kafka.properties.sasl.jaas.config=org.apache.kafka.common.security.scram.ScramLoginModule required username="admin" password="Kafka#Cestc2021";

spring.kafka.properties.security.protocol=SASL_PLAINTEXT

spring.kafka.properties.sasl.mechanism=SCRAM-SHA-256

#=============== provider =======================

spring.kafka.producer.retries=0

每次批量发送消息的数量

spring.kafka.producer.batch-size=16384

spring.kafka.producer.buffer-memory=33554432

指定消息key和消息体的编解码方式

spring.kafka.producer.key-serializer=org.apache.kafka.common.serialization.StringSerializer

spring.kafka.producer.value-serializer=org.apache.kafka.common.serialization.StringSerializer

#=============== consumer =======================

指定默认消费者group id

spring.kafka.consumer.group-id=dq

spring.kafka.consumer.auto-offset-reset=latest

spring.kafka.consumer.enable-auto-commit=true

spring.kafka.consumer.auto-commit-interval=100

指定消息key和消息体的编解码方式

spring.kafka.consumer.key-deserializer=org.apache.kafka.common.serialization.StringDeserializer

spring.kafka.consumer.value-deserializer=org.apache.kafka.common.serialization.StringDeserializer

@KafkaListener(groupId = "${spring.kafka.consumer.group-id:dq}",topics = {"t_dq_rwzt_topic"})
public ReturnT<String> listenKafka2(String records, Acknowledgment ack) {

}

offset explorer发现生产者发送了消息，offset是0

问题解决：

后来查看生产者kafka配置,发现他们的enable-auto-commit是false：

spring.kafka.consumer.enable-auto-commit=false

修改kafka配置

spring.kafka.consumer.enable-auto-commit=false

在侦听器容器中运行的线程数

spring.kafka.listener.concurrency=5

listner负责ack，每调用commit方法，立即向服务器提交

spring.kafka.listener.ack-mode=manual_immediate