Since all runnables use Zookeeper to find services, the information needed to find and use an external DBMS must be added to Zookeeper as well. ACC commands are used for registering and updating external services. With the register external service command you perform the initial registration of the service. With the list external services command you can get an overview of all external services that are currently registered. You can use the following command to review the properties of individual registered services:

With the update external service command you can change individual properties of the registered service.