August 2019
Beginner to intermediate
232 pages
3h 50m
Chinese
Content preview from Web容量规划之美
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36
第
2
章
这些都是常识，对吧？尽管如此，我们仍然惊奇地看到，许多组织并不在早期就
进行需求收集（整理）工作，相反他们坐在那里，直到很多用户抱怨（网页）反
应缓慢或超时。很显然这并不是一个好策略。
为网站的每一部分建立令人满意的速度和可靠性需要相当大的投入。但是当你进
行升级规划时或是需要了解应该保持何种标准时就会从中受益。本章将向你介绍
怎样理解你管理的和客户迫使你处理的各种需求，以及如何借助架构设计帮助你
进行此项规划。
不同种类的需求和测量方法
现在我们来讨论一下不同的需求，这些需求是组织外部的其他人设定的。下面让
我们看一下需要处理的几种类型：你的经理、终端用户，以及与你一起运营网站
的客户，他们都有不同的目标（需求）和衡量成功的不同方式。即使是在没有服
务器的前提下，你必须制定服务级别协议（
SLA
）或服务水平目标（
SLO
）正在使
用的服务，你可以满足自己的业绩目标或
SLA
的要求（在本章的后面讨论）。总
而言之，这些要求或容量目标都是互相关联的。我们可以把它们归纳为以下几点：
•
性能、可用性和可靠性。
─ 外部服务监视。
─ 业务要求。
─ 用户期望。
•
能力。
─ 系统度量。
─ 资源的上限。
解读正式测量
你的网站应该不仅让你身边的同事用他的设备登录网站测试，而且还要能够让位
于其他大洲的真实访问者在网络速度缓慢的情况下进行访问。这一点尤其重要，
因为移动网络的速度在全球范围内变化很大，如图
2-1
所示。
37
设定容量目标
图
2
-
1
：全球移动网络速度（来源：https://opensignal.com/reports/ ...
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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.