image.png
测试使用的消息为
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test1
生产者发送六十万，一个消费者，接收消息后写入log4j本地磁盘，结果如下（单位：ms）
image.png
日志文件为：
image.png
test2
image.png
image.png
经过测试发现spring kafka中封装的concurrency是指再实例上创建多少个consumer进行消费，对应parttition的数量一致。
spring.kafka.listener.concurrency= 6
