Python KafkaConsumer 未连接

Question

设置：

我有 3 个码头集装箱

1) For Kafka
2) For Zookeeper
3) For JupyterLab

我在这些容器之间设置了网络，我看到 kafka 生产者能够运行并生成数据。

KafkaProducer.ipynb

KAFKA_BROKER = ['172.20.0.2:9093']
from kafka import KafkaProducer
from kafka.errors import KafkaError

producer = KafkaProducer(bootstrap_servers=KAFKA_BROKER)

for _ in range(100):
    print("sending")
    producer.send('my-topic', key=b'foo', value=b'bar')
    print("success")

这里 send() 发送消息 100 次。

KafkaConsumer.ipynb

KAFKA_BROKER = ['172.20.0.2:9093']
from kafka import KafkaConsumer

consumer = KafkaConsumer('my-topic',group_id='my-group',bootstrap_servers=KAFKA_BROKER)

print("Comm success")

for message in consumer:
    # message value and key are raw bytes -- decode if necessary!
    # e.g., for unicode: `message.value.decode('utf-8')`
    print ("%s:%d:%d: key=%s value=%s" % (message.topic, message.partition,
                                          message.offset, message.key,
                                          message.value))

在上面的消费者代码中，print("Comm success") 行永远不会被执行。基于生产者代码执行，网络是开放的，jupyter 能够与 kafka 代理对话。但是，客户端无法连接到同一个代理进行数据消费。如何开始调试？

Answer 1

默认auto.offset.reset的值为latest，所以用新的group.id将它设置为earliest

consumer = KafkaConsumer('my-topic',group_id='new-group',auto_offset_reset = 'earliest',bootstrap_servers=KAFKA_BROKER)