For subscriptions that trigger Data Integration tasks, mapping is the data mapping between the Cloud Integration Hub publication repository and the target that consumes the data.
A subscription runs a Data Integration task that includes information about the target data structure and the database connection. The task reads from the topic tables and consumes the data into the target application.
You can create the task in Data Integration and then select it when you create the subscription in Cloud Integration Hub, or create the task when you create the subscription. Cloud Integration Hub triggers the task when the publication is ready for subscribers and uses the Cloud Integration Hub cloud connector to read the data from Cloud Integration Hub.
You can create a compound subscription, where the subscription consumes data sets from multiple topics. The subscription process starts after all publications from all topics publish data. You can specify the maximum time to wait for all publications to finish publishing, from the time the first publication is ready to consume.