August 2019
Beginner to intermediate
232 pages
3h 50m
Chinese
Content preview from Web容量规划之美
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16
第
1
章
在云计算中运行时，我们不会注意针对水平扩容和自动扩容的细节（在第
6
章中，
我们详细介绍了为什么它是不平凡的设置自动缩放政策）。“重量级”的实例类
型和预留空间（仔细调研的结果）是资源快速消耗的两个常见原因。文章“你的
公司不应该犯的三个基础设施错误”强调使用公共云服务在规模上变得非常昂贵。
与
Netflix
相反，许多其他大公司（例如但不限于
Dropbox
），从一开始就拥有公
有云的基础设施，并已经迁移到自己的数据中心。本书提供了从公有云迁移到运
行你自己的基础设施的指导。
即使在数据中心的背景下，容量规划会由于缺乏细节的错误而产生严重的影响。
这在一定程度上源于长期的供应链周期和与供应和配置相关的开销。相比之下，
独立于成本方面的考虑，云的弹性大大降低了峰值负载不足的可靠性风险。
如果你感兴趣的是一个更正式或学术处理的主题——容量计划，请参阅本章后面
的“延展阅读”。
预测你的系统何时会崩溃
了解每一个基础设施何时会崩溃（优雅与否）是容量计划的关键。在目前情况下
崩溃意味着我们的服务情况没有达到
SLA
（服务水平协议）（在第
2
章讨论），
IT
领域这个就是“优雅地”降解性能或者导致“真正的”系统故障（确定对应于
后者的范围是在第
3
章中详细讨论）。对于
Web
或移动
App
的容量规划，通常比
我们预估的要多很多），看起来像图
1-4
所示的方法。
图
1
-
4
：找到故障点
将这些信息作为你容量预估时需要考虑的一部分，是强制而非可选的。但是，要
想确定你网站后台每一部分的限制可能十分棘手。一个简单同时可拆分的体系架
17
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.