alicanalbayrak/kafka-stream-score-aggregate

A starter project for experimenting on KStream and KTable APIs. Fetches (playerName, total goal) and updates scoreboard in on an update.

Kafka Scoreboard Aggregator App

This is a very trivial project to test KStream and KTable APIs. Basically, fetches (playerName,totalGoal) and updates scoreboard in on update.

Getting Started

Prerequisites

• Java 8+ (tested with v.13)
• Kafka cluster (and required topcis)

TODO: auto-generate topics

Build

TODO: runnable jar

• mvn clean package

Run on your local

1. Go to /docker directory and run docker-compose up -d

   ➜  docker docker-compose up -d
   Creating network "docker_default" with the default driver
   Creating docker_kafka-cluster_1 ... done
   

   Note the name of the started instance (docker_kafka-cluster_1), we'll use it in the next step.

2. Connect to docker instance

   docker exec -it docker_kafka-cluster_1  /bin/bash
   

3. In docker_kafka-cluster_1 run following topic creation commands

   root@fast-data-dev / $ kafka-topics --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic input-topic
   Created topic input-topic.
   root@fast-data-dev / $ kafka-topics --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic intermediate-table-topic --config cleanup.policy=compact
   Created topic intermediate-table-topic.
   root@fast-data-dev / $ kafka-topics --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic output-topic  --config cleanup.policy=compact
   Created topic output-topic.

4. Start producer

   kafka-console-producer --broker-list localhost:9092 --topic input-topic --property "key.separator=,"

5. Start consumer

   kafka-console-consumer --bootstrap-server localhost:9092 \
       --topic output-topic \
       --from-beginning \
       --formatter kafka.tools.DefaultMessageFormatter \
       --property print.key=true \
       --property print.value=true \
       --property "key.separator=," \
       --property key.deserializer=org.apache.kafka.common.serialization.StringDeserializer \
       --property value.deserializer=org.apache.kafka.common.serialization.StringDeserializer

6. Start application

   • TODO

       java -jar app.jar