 CMQ 支持将 queue/topic 模式混合使用。典型的场景是 client 端发起异步调用请求，后端为重逻辑，无法实时反馈结果。传统的做法是 client 端多次重复轮询。使用 CMQ 添加订阅，可配置在后端重逻辑完成时，将通知投递给 client 端用户。
参考图示如下：
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