The book I’m currently reading is Designing Data Intensive Applications by Martin Kleppmann. During the first read, I found concise fundamentals we need to concern most when dealing with a high quality software system.

Last week I have a chance to perform Redis cluster migration. Our Redis cluster contains 6 high memory VMs. At peak, it has 800 request/second. In this article I would like to explain how we migrate Redis cluster with zero downtime as well as lesson learned I’ve gathered.