Chris Ford & Ido Gileadi 
Patterns for Performance and Operability [PDF ebook] 
Building and Testing Enterprise Software

Applications that work perfectly in controlled settings often fail in production environments, impacting business operations. This book explores a frequently overlooked aspect of software development: non-functional design and testing. In the real world, hostile production conditions and changing business usage can lead to unforeseen downtime or unacceptable system performance. Written by technologists and based on real field experience, the book examines common failure scenarios, defensive design patterns, and effective performance strategies.