Example project on how to use Apache Kafka and streaming consumers, namely:

• Producer sending random number words to Kafka
• Consumer using Kafka to output received messages
• Streaming Consumer using Apache Spark to count words occurrences
• Streaming Consumer using Apache Flink to count words occurrences

• Docker
• Docker Compose
• Java 8
• Maven

1. Build Java project

   mvn clean package
   

2. Build Docker image

   docker build -t kafka-spark-flink-example .
   

1. Start docker containers

   docker-compose up -d
   

1. Check producer logs

   docker logs kafka-spark-flink-example_kafka-producer_1 -f
   

   Output should be similar to:

   [main] INFO  org.davidcampos.kafka.producer.KafkaProducerExample - Sent (74b23319-084c-4309-80a7-c0d6f107a092, eight) to topic example @ 1525127107909.
   

2. Check consumer with Spark logs

   docker logs kafka-spark-flink-example_kafka-consumer-spark_1 -f
   

   Output should be similar to:

   (two,3)
   (one,3)
   (nine,5)
   (six,8)
   (three,2)
   (five,2)
   (four,9)
   (seven,3)
   (eight,6)
   (ten,6)
   

3. Check consumer with Flink logs

   docker logs kafka-spark-flink-example_kafka-consumer-flink_1 -f
   

   Output should be similar to:

   1> (ten,85)
   4> (nine,104)
   1> (ten,86)
   4> (five,91)
   4> (one,94)
   4> (six,90)
   1> (three,89)
   4> (six,91)
   4> (five,92)
   

Kafka Manager Web UI available at http://localhost:9000.

Spark Web UI available at http://localhost:4040.

1. Stop docker containers

   docker-compose down