November 2021
Beginner to intermediate
239 pages
4h 15m
Chinese
Content preview from Dapr学习手册
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48
｜
第
1
章
执行验证测试。如果测试失败，则所有的东西都会被回滚，
IT
人员对比意见
非常大。当他们的传呼机响了起来时，他们告诉我们，只能明天再做下一次
部署。
当时，浏览器
/
服务器
(B/S)
架构正在兴起，并将取代成熟的客户机
/
服务器
(C/S)
架构。
B/S
架构的主要承诺是通过使客户机变得像
Web
浏览器一样轻薄，
从而使客户端可以被顺利采用。随着越来越多的公司尝试采用基于订阅的业
务模式，而不是传统的基于许可的业务模式，
B/S
架构将大量的计算资源集中
回集中式服务器。这些服务器对业务至关重要。然而，管理它们成为一个越
来越难的问题。公司必须通过大量的容量规划流程，以确保他们能够购买足
够的服务器，在预算不超支的情况下满足他们的需求。同时，由于在更新和
服务器故障期间必须保持服务的可用性，各公司需要有能力在尽可能少的中
断运行服务的情况下，快速、一致地部署和更新其应用程序。
1.2
云的承诺与挑战
若干年后，云计算迎接了运行高可用托管服务的挑战。云承诺提供更高的可
用性和更好的弹性，提供基于使用量的计费方式和近于无限的容量。然而，
这些承诺并不是没有代价的。它们对应用程序的设计方式提出了一些新的要
求。
1.2.1
可用性
云计算通过冗余来实现高可用性。云服务器并不神奇，它们一样会发生故障，
就像你自家的数据中心服务器那样。但是，当云服务器发生故障时，供应商
并不是有足够的人力资源来诊断和修复服务器问题。相反，他们会简单地从
庞大的服务器池中调出另一台服务器，并将你的应用程序迁移过来，然后它
就会像往常一样继续运行。
这意味着 ...
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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.