AWS CloudFormation StackSets announces a new capability ConcurrencyMode that provides customers a faster deployment experience while balancing deployment safety. Customers control speed and safety of their stack set deployments with concurrency and failure tolerance. Customers define these parameters along with ConcurrencyMode as a part of their StackSetOperationPreferences prior to running a stack set operation. StackSetsOperationPreferences is available with the following six APIs: create-stack-instances, delete-stack-instances, detect-stack-set-drift, import-stacks-to-stack-set, update-stack-set and update-stack-instances. With the ConcurrencyMode parameter, customers can modify existing deployment behavior of stack set operations for faster deployments that decouples concurrency from failure tolerance.