我正在尝试实现python-aiokafka异步库，由于某些原因，我无法异步处理消息。
我创建了async consumer、producer并使用asyncio python库。

环境：

python 3.7.2
aiokafka==0.5.1
kafka-python==1.4.3

消费者：

from aiokafka import AIOKafkaConsumer
import asyncio
import json
import ast

loop = asyncio.get_event_loop()

async def consume():
    consumer = AIOKafkaConsumer(
        "test_topic", loop=loop, bootstrap_servers='localhost:9092')
    # Get cluster layout and topic/partition allocation
    await consumer.start()
    try:
        async for msg in consumer:
            sleep_time = ast.literal_eval(json.loads(msg.value))
            print('before sleep %s' % sleep_time)
            await asyncio.sleep(sleep_time)
            print('after sleep %s' % sleep_time)
    finally:
        await consumer.stop()

loop.run_until_complete(consume())

制作人：

import json
import uuid
from kafka import KafkaProducer, KafkaConsumer

class KafkaClient(object):
    def __init__(self, topic_name=None, consume=True):
        """
        Initial consumer and producer for Kafka
        :param topic_name: consumer topic name
        """
        self.topic_name = topic_name
        if topic_name is not None:
            self.kafka_connect(topic_name, source='SOURCE')

        self.producer = KafkaProducer(bootstrap_servers='localhost:9092',
                                      key_serializer=str.encode,
                                      value_serializer=lambda m: json.dumps(m).encode('utf-8'))

    def publish_message(self, topic_name, message, extra_data=None):
        try:
            msg_uid = str(uuid.uuid1())
            self.producer.send(topic_name, value=json.dumps(message))
            self.producer.flush()
            print('Message published [msg_uid]: %s' % msg_uid)
            return True

        except Exception as err:
            print(err)
            return False

k = KafkaClient()
for i in range(0, 1):
    k.publish_message('test_topic', 5)
    k.publish_message('test_topic', 3)
    k.publish_message('test_topic', 1)

预期结果：

该过程将打印：

before sleep 5
before sleep 3
before sleep 1 
after sleep 1
after sleep 3
after sleep 5

实际结果：

过程打印

before sleep 5
after sleep 5
before sleep 3
after sleep 3
before sleep 1 
after sleep 1