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Update ch8.md #58

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Dec 13, 2019
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Update ch8.md #58

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​ 当你编写运行在多台计算机上的软件时，情况有本质上的区别。在分布式系统中，我们不再处于理想化的系统模型中，我们别无选择，只能面对现实世界的混乱现实。而在现实世界中，各种各样的事情都可能会出现问题【4】，如下面的轶事所述：

> ​ 在我有限的经验中，我已经和很多东西打过交道：单个**数据中心（DC）**中长期存在的网络分区，配电单元PDU故障，开关故障，整个机架意外的电源短路，全直流主干故障，全直流电源故障，以及一个低血糖的司机把他的福特皮卡撞碎在数据中心的HVAC（加热，通风和空气）系统上。而且我甚至不是一个运维。
> ​ 在我有限的经验中，我已经和很多东西打过交道：单个**数据中心（DC）**中长期存在的网络分区，配电单元PDU故障，交换机故障，整个机架的意外重启，整个数据中心主干网络故障，整个数据中心的电源故障，以及一个低血糖的司机把他的福特皮卡撞在数据中心的HVAC（加热，通风和空调）系统上。而且我甚至不是一个运维。
>
> ——柯达黑尔

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