Putting Several Event Types in the Same Topic – Revisited

The text discusses the different ways to store several event types in the same Apache Kafka topic, specifically when using Confluent Schema Registry. The newer subject-name strategies use record names or topic names to determine schema lookups, but lose subject-topic constraints. In contrast, using a union (or oneof) with schema references maintains subject-topic constraints and allows event types to evolve independently, while also enabling automatic registration of top-level schemas in the case of Protobuf and JSON Schema formats. This approach is particularly useful for querying topics with ksqlDB, as it provides a bounded set of event types defined by the union. Additionally, Confluent Platform 7.7 has been released with enhanced security features, including OAuth support, as well as new connectors and other key features.

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