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This article examines "what are the guidelines for scalable Web services". The content is detailed and easy to understand. Friends who are interested in "what are the guiding principles of scalable Web services" can follow the editor's train of thought to read it in depth. I hope it will be helpful to you after reading. Let's learn more about "what are the guiding principles of scalable Web services" with the editor.

Scalable Web services focus on performance optimization, but focusing on optimization is not the key. Tom Killalea,Amazon 's vice president of technology for infrastructure and distributed systems recently published an article on building scalable Web services on ACM queue. He outlines the guidelines for building scalable Web services and lists many real-world examples, with the core theme of "build only what you need."

Vigilance: premature optimization

The time and resources spent on optimizing scalability are not as good as on improving the user experience and attracting traffic.

Vigilance: over-optimization

He cites Nicholas Nassim Taleb's work on the significant impact of highly non-probable events and suggests using redundancy as a strategy to improve availability; the idea of using redundancy as a load balancing rather than just a failure recovery mechanism is clearly more cost-effective than over-optimizing for low-probability events.

Vigilance: goal-driven optimization

It is risky to model the desired traffic and then build a precise scalability plan to meet this goal. Good models are difficult to build and can be affected by simplifying or reducing optimistic estimates of variables. [.] If your Web service is successful, you'll end up with a bigger demand than the target model-maybe not this black Monday or Super Bowl weekend, but probably soon, within a time frame you didn't expect.

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