AWS CloudFormation launches a new parameter OnStackFailure for the CreateChangeSet API that allows customers to control the rollback behavior of ChangeSets. Customers use ChangeSets to preview the impact of a stack operation on active resources. Customers can deploy ChangeSets with an ExecuteChangeSet operation. With this launch, customers can modify the actions that CloudFormation will take when ChangeSet execution is unsuccessful. This allows customers to reduce manual intervention during retries of ChangeSet executions.
Source:: Amazon AWS