This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
Our book also covers strategies for building applications can handle heavy load. Obviously, this doesn't break down to a single topic, but we focus on important scalability concepts, such as caching techniques, load-testing approaches, managing concurrent updates, clustering, querying optimizations, lazy loading, and more. Many of these topics covered in our book are based on our own experiences designing, deploying, and maintaining high-volume websites.
I hope this helps, and thanks for your question.
Paul Tepper Fisher, author, Spring Persistence with Hibernate