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end-to-end-demo

README.md

End-to-end demo of Debezium used during presentations

It does these things:

  • setting up Debezium against running mysql
  • displaying events using console consumer
  • setting up JDBC sink connector to stream the events to Postgres
  • demonstrating how a downtime of Kafka Connect doesn't affect the source app
  • demonstrating how to consume events using Thorntail + CDI and stream them to a WebSockets client in another browser window
  • demonstrating how a single connect instance can support Avro and Json serialization for multiple connector configurations

Setup Environment

  • export DEBEZIUM_VERSION=1.9

Build maven artifacts used by the Docker builds

  • mvn clean package -f debezium-hiking-demo/pom.xml
  • mvn clean package -f debezium-thorntail-demo/pom.xml

Prepare Kafka etc.

  • docker ps -a
  • docker-compose up --scale thorntail=0 --scale hiking-manager=0

Prepare WildFly

Register source connector (Avro)

  • Note: The connect instance is configured to use JSON serialization by default. The configuration used for the hiking-connector and its accompanying jdbc-sink are explicitly configured to use AVRO.

  • cat register-hiking-connector.json | http POST http://localhost:8083/connectors/

  • http localhost:8083/connectors/hiking-connector/status

  • docker-compose exec schema-registry /usr/bin/kafka-avro-console-consumer --bootstrap-server kafka:9092 --from-beginning --property print.key=true --property schema.registry.url=http://schema-registry:8081 --topic dbserver1_inventory_Hike

  • http http://localhost:8081/subjects/dbserver1_inventory_Hike-value/versions/1 | jq '.schema | fromjson'

Register sink connector

  • Back to slides - mention SMT

  • cat jdbc-sink.json | http POST http://localhost:8083/connectors/

  • http localhost:8083/connectors/

  • docker-compose exec postgres bash -c 'psql -U $POSTGRES_USER $POSTGRES_DB -c "select * from \"dbserver1_inventory_Hike\""'

Stop Kafka Connect

  • docker stop end-to-end-demo_connect_1
  • Change some data
  • docker-compose up -d connect
  • Show PG again as it catches up

Register source connector (JSON)

  • cat register-hiking-connector-json.json | http POST http://localhost:8083/connectors/
  • docker-compose exec kafka /kafka/bin/kafka-console-consumer.sh --bootstrap-server kafka:9092 --from-beginning --property print.key=true --topic dbserver1_inventory_Hike_json

Start Thorntail app

Misc.

  • docker-compose exec kafka /kafka/bin/kafka-topics.sh --list --bootstrap-server kafka:9092
  • docker-compose exec mysql bash -c 'mysql -u $MYSQL_USER -p$MYSQL_PASSWORD inventory'