kafka测试

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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）

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日志文件为：

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test2

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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