August 2019
Beginner to intermediate
232 pages
3h 50m
Chinese
Content preview from Web容量规划之美
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117
趋势预测
当然
，
如果你不想在业务增长的时候措手不及
，
这本书可以将你从那种危局中
拯救出来
。
反过来说
，
当你采购了许多处于闲置状态的设备时
，
公司财务负责
人不会对你有太高的评价
，
几个月后你就会看到这些设备的价格下降了
。
曲线拟合
一个好的容量规划取决于你对重要资源的需求，以及随着时间的推移对需求变动
情况的了解程度。一旦收集好容量的历史数据，你就可以着手分析趋势和模式重现。
例如上一章我们讲述了如何在
Flickr
里分析得知，星期日是一周中照片上传量最
大的一天。这一有趣的现象引申出下列问题：星期日的峰值是随时间推移而改变
的吗？如果答案是肯定的，那么相对一周中的其他天又是如何变化的呢？上传量
最大的一天总是星期日吗？如果我们增加居住在国际日期变更线对面的新用户，
它会发生变化吗？星期日已然是一周中上传量最大的一天吗？一旦掌握了相关的
数据，上述问题都可以得到解答，这些答案也会逐步加深我们对规划新功能推出、
运营故障和时间窗口期的见解。
认识趋势是有价值的，有许多原因，而不仅仅是容量规划。当我们在第
3
章查看
磁盘空间消耗时，我们偶然发现了一些每周上传模式。在以后做出决定时，意识
到任何重复的模式是非常宝贵的。趋势还可以通知社区管理、客户关怀和支持、
产品管理和财务。下面举一些示例来说明度量指标的测量的价值：
•
你的运维小组可以安排星期五进行日常例行维护操作而不是星期天，这样就不
会影响图片处理的机器，从而最小化任何对用户不利的影响。
•
如果上线了涉及上传处理基础架构相关的新代码，你可能要格外留意接下来的
周日，系统处于高负载时是否运行正常。 ...
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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.