Python、Kafka 和 Docker - KafkaConsumer 一直挂起

Question

我有以下 docker-compose 文件：

  version: '3.1'

  services:
    postgres_db:
      image: postgres
      restart: always
      environment:
        POSTGRES_USER: admin
        POSTGRES_PASSWORD: admin
        POSTGRES_DB: default_db
      ports:
        - 54320:5432
    zookeeper:
      image: wurstmeister/zookeeper
      ports:
        - "2181:2181"
    kafka:
      image: wurstmeister/kafka
      ports:
        - "9092:9092"
      environment:
        KAFKA_ADVERTISED_HOST_NAME: kafka
        KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
        KAFKA_CREATE_TOPICS: "test:1:1"
      volumes:
        - /var/run/docker.sock:/var/run/docker.sock

使用 docker-compose up 运行后 - 从终端输出看一切正常。我启动 python 控制台并运行以下行：

kp = KafkaProducer(bootstrap_servers=['localhost:9092'],api_version=(0,10),
                         value_serializer=lambda x: 
                         dumps(x).encode('utf-8'))
kc = KafkaConsumer('test', bootstrap_servers=['localhost:9092'],api_version=(0,10),group_id=None,auto_offset_reset='earliest', 
                   value_deserializer=lambda json_data: json.loads(json_data.decode('utf-8')))
data = {"test":"test"}
kp.send(topic="test",value=data)
for message in kc:
    print(message.value)

但是在运行执行此操作后，控制台只是挂起，并且消息看起来不像是 consumed/produced。任何想法这里出了什么问题？谢谢！

Answer 1

要么您需要运行您的 Python 容器中的代码并设置

bootstrap_servers=['kafka:9092']

或者您需要将 Kafka 通告给主机上的客户端

KAFKA_ADVERTISED_HOST_NAME: localhost

您也可以阅读有关 HOSTNAME_COMMAND 用法的 wurstmeister README

我还建议运行在测试生产者和消费者时将它们分开

Python、Kafka 和 Docker - KafkaConsumer 一直挂起

Python, Kafka and Docker - KafkaConsumer keeps hanging

python

apache-kafka

docker

kafka-consumer-api

kafka-producer-api