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Ben Nadel at cf.Objective() 2014 (Bloomington, MN) with: Clark Valberg
Ben Nadel at cf.Objective() 2014 (Bloomington, MN) with: Clark Valberg ( @clarkvalberg )

Feature Flags Book: Going Deep On Feature Flag Targeting

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As web application developers, we generally communicate with the database anytime we need to gather information about the current request. These external calls are fast; but, they do have some overhead. And, the more calls that we make to the database while processing a request, the more latency we add to the response-time.

In order to minimize this cost, most feature flag implementations use an in-memory rules engine which allows feature flag state to be queried without having to communicate with an external storage provider. This keeps the processing time blazing fast! So fast, in fact, that you should be able to query for feature flag state as many times as you need to without having to worry about latency.


In 2023, I published a book titled, "Feature Flags: Transform Your Product Development Workflow". This book contains everything that I've learned over the last 7 years about integrating feature flags into my product development. But, a static book can only take you so far. In an effort to make the book more interactive, I've created a series of blog posts—one per chapter—that provide a place in which the readers and I can discuss the content. You can purchase the book and / or read a preview of each chapter on the book's mini-site. Feel free to leave a question or a comment down below.

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Ben Nadel