Setup to serve as proof of concept in using Kafka with ksqlDB in combination with the query language GraphQL.
js-graphql-endpoint runs on http://localhost:4000 (once it can handle references)
Open interactive ksql promt: docker exec -it ksqldb ksql http://ksqldb:8088
The data-producer is updating every 5 seconds, which causes all the persons in the update to update.
See the results: kafka-protobuf-console-consumer --topic PERSONS_WITH_ADDRESS --bootstrap-server localhost:9092 --from-beginning