1. A method for composite service provisioning, the method comprising: receiving, by a computer processor, a first demand value of a first composite service; identifying, by the computer processor, a sub-service based on the first composite service; pre-provisioning, by the computer processor, a first pool of service instances corresponding to the first composite service, the first pool of service instances having a quantity of service instances based, at least in part, on the first demand value; determining, by the computer processor, a second demand value of the sub-service based, at least in part, on the quantity of service instances of the first pool of service instances; pre-provisioning, by the computer processor, a second pool of service instances corresponding to the sub-service, the second pool of service instances having a quantity of service instances based, at least in part, on the second demand value; and modifying, by the computer processor, each of the first pool of service instances with placeholder credentials that identify the second pool of service instances.