RocketMQ原理解析-consumer 3.长轮询

http://blog.csdn.net/quhongwei_zhanqiu/article/details/39142897 Rocketmq的消息是由consumer端主动到broker拉取的, consumer向broker发送拉消息请求， PullMessageService服务通过一个线程将阻塞队列LinkedBlockingQueue<PullRequest>中的PullRequest

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