Asynchronous communication best practices
In this section, we are going to cover the best practices of using the asynchronous communication model. You will learn some high-level recommendations for adopting the model in your applications and using it in a way that would maximize its benefits for you.
Versioning
Versioning is the technique of associating the format (or a schema) of the data with its version. Imagine you are working on a rating service, and you use a publisher-subscriber model for producing and consuming rating events. If at some point the format of your rating events gets changed, some of the events that are already produced will have an old data format, and some will have the new one. This situation may be hard to handle because the logic consuming such data would need to know how to differentiate between such formats and how to handle each one. Differentiating between two formats without knowing the data schema or its version could be a nontrivial task. Imagine...
