You can now inject Amazon EC2 Spot Instance interruptions into your Spot Instance workloads using AWS Fault Injection Simulator (FIS). Spot Instances enable you to run compute workloads on Amazon EC2 at steep discounts in exchange for returning the Spot Instances when Amazon EC2 needs the capacity back. Because it is always possible that your Spot Instance may be interrupted, you should ensure that your application is prepared for a Spot Instance interruption. However, until now it has been difficult to recreate the circumstances of a Spot Instance interruption in order to evaluate and improve how your application responds.
Source:: Amazon AWS