version: "2.4"
services:

  zookeeper-1:
    image: confluentinc/cp-zookeeper
    hostname: zookeeper-1
    ports:
      - 12181:2181
    environment:
      ZOOKEEPER_SERVER_ID: "1"
      ZOOKEEPER_CLIENT_PORT: 2181
      ZOOKEEPER_SERVERS: zookeeper-1:2888:3888
      ZOOKEEPER_4LW_COMMANDS_WHITELIST: "*"
      KAFKA_HEAP_OPTS: "-Xmx256M -Xms256M"

  kafka-1:
    image: confluentinc/cp-kafka:5.3.4
    hostname: kafka-1
    ports:
      - 19092:19092
    depends_on:
      - zookeeper-1
    environment:
      KAFKA_LISTENERS: "INTERNAL://kafka-1:9092,EXTERNAL://:19092"
      KAFKA_ADVERTISED_LISTENERS: "INTERNAL://kafka-1:9092,EXTERNAL://localhost:19092"
      KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: "INTERNAL:PLAINTEXT,EXTERNAL:PLAINTEXT"
      KAFKA_INTER_BROKER_LISTENER_NAME: INTERNAL
      KAFKA_AUTO_CREATE_TOPICS_ENABLE: "false"
      KAFKA_ZOOKEEPER_CONNECT: "zookeeper-1:2181"
      KAFKA_BROKER_ID: "1"
      KAFKA_HEAP_OPTS: "-Xmx512M -Xms512M"
      KAFKA_TRANSACTIONAL_ID_EXPIRATION_MS: 5000 # forcing both: ProducerState timeout to 5 seconds
      KAFKA_LOG_RETENTION_MS: 5000 # forcing both: kafka retention to 5 seconds
      KAFKA_LOG_RETENTION_CHECK_INTERVAL_MS: 2000
      KAFKA_LOG_ROLL_MS: 1000

  producer:
    build: ./producer
    environment:
      JAVA_OPTS: "-Xmx128M -Xms128M"
      KAFKA_BOOTSTRAP_SERVERS: "kafka-1:9092"
      TOPIC: "sample"
      REPLICATION_FACTOR: 1
      NUMBER_OF_PARTITIONS: 1
      MESSAGE_BACKOFF: 30000 # sleep 30 seconds after sending another message
      KAFKA_ACKS: "all"
      KAFKA_ENABLE_IDEMPOTENCE: "true"
    depends_on:
      - kafka-1