August 2019
Beginner to intermediate
232 pages
3h 50m
Chinese
Content preview from Web容量规划之美
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1
前言
在某年国际足联世界杯之前，
Twitter
上最常见的讨论话题是，在上届国际足联世
界杯期间，
Twitter
服务总是不可用。特别是每当巴西或日本在比赛中打入一球时，
Twitter
服务的访问高峰会导致服务不可用。失败鲸
译注
1
在
Twitter
早期的可用性
问题总是会出现。因此，某年国际足联世界杯期间
Twitter
服务的目标之一是无故
障、无停机持续服务。此外，另一个关键目标是确保
Twitter
移动应用程序在进行
Twitter
照片分享或其他对性能要求较高的操作能够保证高性能。如何去实现这个
目标呢？
译注
1
：
失败鲸（
Fail Whale
）是微博客网站
Twitter
宕机时的标志画面，由华裔设计师
Yiying
Lu
设计，目前在全世界正火热流传。
2
前言
类似前面的情况，如像超级碗这样的大型赛事会大幅度增加推特的使用，另一个
重点在于
Twitter
微博转发、收藏、
DMS
高峰等流量拥堵的情况下保证
Twitter
的
高可用性。可以想象，我们可以分析过去的高峰流量相对于正常流量的比例，然
后提出削减幅度的预估峰值持续运行。话虽如此，我们应该部署这样的容量能力
来应对这种的一次性事件吗？特别是考虑到这种容量很可能在一年中的大部分时
间是比较空闲的。你如何处理意外事件，假设在某年超级碗期间发生断电？确保
在此类事件中服务的高可用性需要设计针对体系结构和容量规划的系统方法。 ...
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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.