新浪微博基于MySQL的分布式数据库实践
提起微博，相信大家都是很了解的。但是有谁知道微博的数据库架构是怎样的呢?在今天举行的2011数据库技术大会上，新浪首席DBA杨海潮为我们详细解读了新浪微博的数据库架构基于MySQL的分布式数据库实践。 ▲新浪首席DBA杨海潮 在本次演讲中，杨海潮简述了分布
提起微博，相信大家都是很了解的。但是有谁知道微博的数据库架构是怎样的呢?在今天举行的2011数据库技术大会上，新浪首席DBA杨海潮为我们详细解读了新浪微博的数据库架构——基于MySQL的分布式数据库实践。
▲新浪首席DBA杨海潮
在本次演讲中，杨海潮简述了分布式数据库设计中的sharding策略：replication和partitioning；MySQL如何和Cache系统更好的结合来实现高并发的读写服务，同时减少应用开发复杂度，以及如何应对Cache层失效带来的高并发读以及瞬时写入高峰问题；怎样使用WT和WR的实现思想来处理数据库的读/写扩展性。
Sharding的原则：杨海潮表示有以下几点：一开始就关注架构设计；Scale up--Scale out--Scale up；成本可控下硬件是首选；逐步解决拆分中成本问题。
Caching原则：采用一致性Hash部署；Cache按照冷热分层；所有热数据都放入Cache；双写来避免雪崩问题；队列方式持久化落入MySQL。杨海潮谈到，DB的延时越来越不可以接爱，进行了并发复制的开发，降低响应时间还是没有解决。
▲第一阶段：MySQL+Memcached
▲第二阶段：MySQL+UDF
▲第三阶段：按冷热度分层
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