中间件与数据库：Redis
Session Management Between Django & Flask Frameworks with Redis
Session Management Tutorial: Reap the benefits of large Python frameworks like Django and the flexibility of Flask by sharing user sessions with Redis.
Redis HyperLogLog
Redis 在 2.8.9 版本添加了 HyperLogLog 结构。 Redis HyperLogLog 是用来做基数统计的算法，HyperLogLog 的优点是，在输入元素的数量或者体积非常非常大时，计算基数所需的空间总是固定 的、并且是很小的。 在 Redis 里面，每个 HyperLogLog 键只需要花费 12 KB 内存，就可以计算接近 2^64 个不同元素的基数。
How HipChat Stores and Indexes Billions of Messages Using ElasticSearch and Redis
This article is from an interview with Zuhaib Siddique , a production engineer at HipChat , mak...
redis - anet 源码简析
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Redis和Memcached的区别
说到Redis就会联想到Memcached，反之亦然。了解过两者的同学有那么个大致的印象：Redis与Memcached相比，比仅支持简单的key-value数据类型，同时还提供list,set,zset,hash等数据结构的存储；redis支持数据的备份，redis支持数据的持久化，看起来redis比memcached更加牛逼一些，那么事实上是不是这样的呢？