August 2019
Beginner to intermediate
232 pages
3h 50m
Chinese
Content preview from Web容量规划之美
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容量规划的目标
、
问题和过程
─ 波动统计
像新发布版本或服务器异常这样的内因，像奥运会或超级碗这样的外
因，它们是如何影响高层次的目标和每个组件的剩余容量的呢？例如，
通常，剩余容量空间的瓶颈对即将到来非预期流量非常敏感。
哪种方式可以提升系统输入流量的负载？例如通过每个组件的排队。
此外，考虑到并非所有输入的流量都具有同等重要性，例如在地震中
搜索重要的人或者幸存者名单，支持与瓶颈相关队列的优先级调度是
很重要的。
例如，通过设置优雅降级，在不影响高级目标的情况下，对每个组件
进行剩余容量和队列之间的权衡。注意，消耗剩余容量有助于排空队
列。然而，它也许不能服务于高容量和高优先级的流量。相反，以排
队为代价维持一个健康的剩余容量可能会导致违反
SLA
。
•
灵活处理请求冲突和改变优先级
─ 例如，在
Web
搜索的上下文中，提高搜索引擎的爬虫和排序组件的新鲜度
和排序练习压力。给定固定的
CAPEX
预算，上述组件对额外容量的要求
可能彼此冲突。这一点本身就有可能被取消优先级，例如，支持新产品的
推出所需的能力。
─ 为解决上述情况设立政策并非罕见。然而，这种政策往往不符合他们的目
标。这可以部分归咎于：①政策，从定义上讲，生产过程中不断变化的现
实情况是不可延展的；②围绕这些政策必然会产生官僚主义框架，这反过
来又会导致惯性和减缓决策过程。
•
与产品和工程团队紧密合作
─ 这对于方便评估未来容量需求是至关重要的。考虑到采购周期会比较长，
最重要的是对未来的产能需求做出预测而不是反应。即使在云计算的背景 ...
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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.