在aiokafka中,可以为每个分区创建一个消费者以获得更好的性能和可伸缩性,因为这样可以将负载分布到多个消费者上。
以下是如何使用aiokafka为每个分区创建消费者的代码示例:
from aiokafka import AIOKafkaConsumer, TopicPartition
async def consume(topic, partitions):
# Create a consumer for each partition
consumers = {}
for partition in partitions:
consumer = AIOKafkaConsumer(
topic,
loop=loop,
bootstrap_servers='localhost:9092',
group_id='my-group-id',
auto_offset_reset='earliest'
)
await consumer.start()
tp = TopicPartition(topic, partition)
await consumer.seek(tp, 0) # Start from beginning
consumers[partition] = consumer
# Consume messages from each partition
try:
while True:
for partition, consumer in consumers.items():
async for message in consumer:
print(f"Consumed message from partition {partition}: {message.value.decode('utf-8')}")
finally:
# Cleanup
for consumer in consumers.values():
await consumer.stop()
在该示例中,我们首先创建了一个名为“consumers”的字典,在其中为每个分区创建了一个aiokafka消费者。然后,我们无限循环每个分区的消费者来消费来自每个分区的消息。最后,我们在finally块中清理消费者。