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# Chapter 9: Consistency and Consensus
# DDIA 逐章精读（九）: 一致性和共识协议（Consistency and Consensus）
> 本章的线性一致性是在铺垫了多副本、网络问题、时钟问题后的一个综合探讨。首先探讨了线性一致的内涵：让系统表现得好像只有一个数据副本。然后讨论如何实现线性一致性，以及背后所做出的的取舍考量。其间花了一些笔墨探讨 CAP，可以看出作者很不喜欢 CAP 的模糊性。
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