Apache Kafka Practice Exam 2025 – The Complete All-in-One Guide for Exam Success!

Message validation in Apache Kafka primarily refers to the process of ensuring that the messages produced to Kafka topics conform to a specific format or structure. Option B correctly highlights that messages are validated against schemas stored in a Schema Registry. The Schema Registry is an essential component in a Kafka ecosystem, used to manage and enforce the schemas that define the structure of the messages.

When producers send messages to Kafka, they can use a specified schema to validate the content before sending it. This helps in maintaining data integrity and ensures that consumers will be able to read and process messages without encountering format issues. By storing these schemas centrally, any changes or versioning can be managed effectively, which is particularly important in systems where many microservices are interacting.

In contrast to the other options, message validation is not solely a function of consumers (as suggested in one of the options), nor does it rely on the database level for validation. Additionally, while it’s true that Kafka itself does not perform message validation by default, the integration of the Schema Registry provides a robust solution for enforcing schema compliance at the producing stage. Thus, the concept of message validation in Kafka is best captured through the use of the Schema Registry.