Cloud-Native Applications in Java

Duplicating data

Within the bounded context, the services are the custodians of the data. But what if another service requires a subset of your data? Some of the questions/solutions that arise are as follows:

• Should I invoke the service to get that data?
  • Increased chattiness among the services
  • Tight coupling of two services
• Can I access the data store directly from another bounded context?
  • Breaks the bounded context model

So, how does another service (residing in another bounded context) get access to the subset of the data? (For example, requiring address attributes for a customer (from customer service) in the personalization services.)

In this case, the best way is to duplicate data from the master domain. The required changes ...