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Redis 精确去重计数 —— 咆哮位图
source link: https://juejin.im/post/5cf5c817e51d454fbf5409b0
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如果要统计一篇文章的阅读量，可以直接使用 Redis 的 incr 指令来完成。如果要求阅读量必须按用户去重，那就可以使用 set 来记录阅读了这篇文章的所有用户 id，获取 set 集合的长度就是去重阅读量。但是如果爆款文章阅读量太大，set 会浪费太多存储
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