November 2019
Beginner to intermediate
406 pages
9h 21m
Chinese
Content preview from Java持续交付
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云平台
｜
45
云计算面临的挑战
作为转向云计算的开发人员，你要面临的核心挑战是，如何学习新的基础设施功能，以
及这些技术的特性和性能。你需要花时间来理解计算机被暴露在公网上所带来的影响
;
你几乎总是在构建一个分布式的系统。你还需要确保应用程序在网络环境与在本地开发
环境上执行的结果一样。
机械同理心 ：
Daniel
的第一次云计算体验
当我第一次开始使用云计算技术时，最大的学习障碍之一是，生产环境基础设
施的特性和性能可能与本地计算机大相径庭！拿
2010
年早期的一个项目来说，
我花了一周时间，构建了一个解析产品
feed
的应用程序，它会将大量的临时数
据写入本地存储。这在我的开发机器（本地连接的
SSD
硬盘）上运行良好，但
是一旦我将代码部署到生产环境上，由于云服务实例上的块存储实际上是通过
网络通信的，于是性能下降了近两个数量级，这种性能表现与本地环境差距非
常大。
由于
IaaS
平台上硬件的特性（和规模），单个组件失败的可能性相对更高。因此，你需
要设计、构建和测试一个弹性的应用程序，可以处理各种已知的故障模式。例如，大多
数云计算实例都是临时性的，可能会意外停止，但你的应用程序必须能够优雅地处理这
些情况。
Amazon
的首席技术官
Werner Vogels
曾经发表了著名的“云计算中的一切都会
失败”的言论。一开始，从云服务商的首席技术官口中听到这句话似乎有点奇怪，但其
实他指的是，公有云的优势
—
按需付费和低成本使用可大规模运行的基础设施
—
是
需要付出代价的，而这个代价就是单个组件的可靠性。
云计算的临时性特点
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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.