线上消费订阅为Topic-A 下有两个 consumer group A，B； 分别订阅 tag-A 与 tag-B
但是tag-B并未在使用（此前使用，后续暂时移除，计划过几个迭代后添加）
consumer group A订阅一切正常，但是 consumer group B开始收到A下消息
如下图某消息同时发到A和B
此时造成消息在consumer B下不断堆积，后续重新启动consumer B
B下消息堆积立刻清空（不是被消费的，日志并未打印任何消息）
此时，原本的错误信息变为
后查证： rocketmq 是 消费组订阅了topic后，topic所有消息都会发到所有消费组，然后消费组没有维护订阅关系，是消费者注册上了以后才有的，也就是消费组不知道他要消费什么tag，所以消费组下面没有消费者，造成了他不知道所有消息该不该过滤，于是造成消费堆积。
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