August 2019
Beginner to intermediate
232 pages
3h 50m
Chinese
Content preview from Web容量规划之美
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45
设定容量目标
都被分析了。这个问题可以通过增加容量和修改网页大小来改变，前者有时比后
者涉及更多的成本。
确定一个网页的感知缓慢的根本原因是什么，相对而言，从整体架构中排查要比
面向服务的架构（
SOA
）或微服务体系架构（
MSA
）更容易（第
1
章讨论这些内
容）。推特和
Netflix
等服务包括数百微服务。在微服务架构下，通常每个微服务
提供特定的功能，例如，在推特会对“跟随谁”推荐不同的微服务，在“你离开时”
的时候展示相关的推特产品特性。
复杂的相互作用的不同结果之间的级联微服务的性能问题，这对平均解决时间有
负面的影响（
MTTR
）。此外，第三方供应商如管理
DNS
、内容分发、内容加速、
广告服务、分析、行为目标、内容优化关键服务的使用和组件进行性能问题的诊
断更具挑战性。
当
John
在
Flickr
时，每秒需要提供上万的照片服务。每个照片服务器可以在达到
最大值之前提供已知和特定的图像速率。他们没有根据磁盘
I/O
、
CPU
、内存来定
义上限，而是根据特定的响应时间内我们能提供多少数量的照片服务来定义。
架构决策
你的体系架构是关于所有后端组件（包括硬件和软件）是怎样结合的基本设计。
架构的设计对于规划和管理容量起到至关重要的作用。
注意
架构设计是一项复杂的工作
，
但有一些优秀的书可以帮助你
：
Cal
Henderson
的
《
Building Scalable Web Sites
》
(O
’
Reilly)
和
Theo
Schlossnagle
的
《
Scalable Internet Architectures
》
(Pearson) ...
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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.