Patterns for Fault Tolerant Cloud Software

Patterns for Fault Tolerant Software was published in 2007 (Wiley). It contains sixty-three patterns related to designing software to tolerate faults with the goal of high availability. The patterns all presuppose traditional software on hardware operating model that was prevalent in the computing industry up to the mid-2000s. With the widespread adoption of software virtualization and cloud computing some of the underlying assumptions present in the book have changed. In this PLoP paper several patterns from this book will be reexamined to discuss the modifications needed to make them useful or relevant to virtualized or cloud environments. Three new patterns for the collection are also in this paper.