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O'Reilly's Performance Optimizations in a Cloud-Centric World

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Introduction Back in the day, it was simple... Content was served from your server, over your network, and then to client machines that you controlled. Even when that moved out from a LAN to a WAN, the connectivity came from a single pro‐ vider—it was all under your control. en came the Internet… Now content was being served across the public Internet to end-user machines—you lost control of the location, type of machine, and type of connectivity. en came the cloud… The cloud brought with it a new way of thinking about web system hosting. Hosting shifted from being a hand-crafted service to a com‐ modity service providing throwaway systems. You moved from being a hardware owner to being a service consumer. With this change came the increasing loss of control over your sys‐ tem. Nowadays your application is often the only element that you control directly, and even that can be dependent on consuming third-party services. is is not a bad thing, but you need to be aware of the issues that can arise as a result of this shift to the cloud. Whether you've already moved systems to the cloud or are thinking of doing so, this book will point out some of the risks to your site's performance created by this loss of control and puts forth some methods to identify and then mitigate those risks. vii

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