This project forked from c4pt0r/pcc
PCC性能挑战赛作品简介及源代码 from 黄东旭
License: Apache License 2.0
实现类似 facebook 中的 like 功能，需要：
可以对一个对象（一条feed、文章、或者url）进行 like 操作，禁止 like 两次，第二次 like 返回错误码
有 isLike 接口，返回参数指定的对象有没有被当前用户 like 过
需要看到一个对象的 like 计数
可以看到一个对象的 like 用户列表（类似 QQ 空间）
上述列表加分项：Like优先显示我的好友列表(social list)
数据量：每天新增的 like 对象数为 1 千万，每秒 like 计数器查询量为 30 万次 / 秒
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