面对缓存，有哪些问题需要思考？

https://mp.weixin.qq.com/s?__biz=MzIwMzg1ODcwMw==&mid=2247486896&idx=1&sn=b1719288eaeb714819dbcf71e0239b47&chksm=96c9bbd0a1be32c6b798403660ce7e3066cea88f38dbe1bda0a8ab7a52bd1c2088617536dbe0&scene=21#w

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