Kafka python 消费者在并行线程中运行

Question

我是 python 和 kafka 的新手。我有一个脚本应该启动三个 kafka 消费者，等待来自这些消费者的消息并执行一些其他操作。此时我什至不知道我是否朝着正确的方向前进，所以任何帮助将不胜感激。

class MainClass():
    def do_something_before(self):
        # something is done here

    def start_consumer(self):
        consumer1_thread = threading.Thread(target=self.cons1, args=())
        consumer2_thread = threading.Thread(target=self.cons2, args=())
        consumer1_thread.daemon = True
        consumer2_thread.daemon = True
        consumer1_thread.start()
        consumer2_thread.start()

    def cons1(self):
        consumer = KafkaConsumer(bootstrap_servers='localhost:9092',
                                 auto_offset_reset='earliest')
        consumer.subscribe(['my-topic'])
        for message in consumer:
            print(message.value)

    def cons2(self):
        consumer = KafkaConsumer(bootstrap_servers='localhost:9092',
                                 auto_offset_reset='earliest')
        consumer.subscribe(['my2-topic'])
        for message in consumer:
            print(message.value)

    def keep_working(self):
        # something is done here

if __name__ == 'main':
    g = MainClass()
    g.do_something_before()
    g.keep_working()

Answer 1

我添加了带有 2 个消费者的 python-kafka 示例（基本上是两个 python 进程），您可以在 github 链接上找到它https://github.com/Shubhamgorde/kafka-python-app。

无法发布整个 python 文件，它有点大。

from multiprocessing import Process

def consumeData(topic):
    try:
         consumer = KafkaConsumer(topic, value_deserializer=lambda v: 
           binascii.unhexlify(v).decode('utf-8'))
    except:
         print("Error!!")

    for msg in consumer:
        msg=ast.literal_eval(msg.value)
        if(msg[2] == 'C'):
            performCreditOperation(msg)
        elif (msg[2] == 'D'):
              performDebitOperation(msg)

t1 = Process(target=consumeData, args=('Credit_transac',))
t2 = Process(target=consumeData, args=('Debit_transac',))
t1.start()
t2.start()