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redis 基本不能跟 etcd 比啊, 没有隔离性, 事务跟没有一样, 但是好像外围的操作一般都会加个锁, 似乎也是可以的...
另外就是自己去 pubsub 的话, 没办法处理 key expired 的情况, 所以只好开启 keyspace notification, 用 list 是不可以的, 用了 core 就没办法 scale out 了