Web Scalability for Startup Engineers by Artur Ejsmont

Author:Artur Ejsmont [Ejsmont, Artur]
Language: eng
Format: azw3, epub, pdf
Publisher: McGraw-Hill Education
Published: 2015-07-03T04:00:00+00:00

CHAPTER

6

Caching

“The supreme art of war is to subdue the enemy without fighting.” –Sun Tzu

Caching, one of the key techniques used to scale web applications, is a critical factor for increasing both performance and scalability at relatively low cost. Caching is fairly simple and can usually be added to an existing application without expensive rearchitecture. In many ways, caching is winning the battle without the fight. It allows you to serve requests without computing responses, enabling you to scale much easier. Its ease makes it a very popular technique, as evidenced by its use in numerous technologies, including central processing unit (CPU) memory caches, hard drive caches, Linux operating system file caches, database query caches, Domain Name System (DNS) client caches, Hypertext Transfer Protocol (HTTP) browser caches, HTTP proxies and reverse proxies, and different types of application object caches. In each case, caching is introduced to reduce the time and resources needed to generate a result. Instead of fetching data from its source or generating a response each time it is requested, caching builds the result once and stores it in cache. Subsequent requests are satisfied by returning the cached result until it expires or is explicitly deleted. Since all cached objects can be rebuilt from the source, they can be purged or lost at any point in time without any consequences. If a cached object is not found, it is simply rebuilt.

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