【python】kafka在与celery和gevent连用时遇到的问题

前提：kafka有同步，多线程，gevent异步和rdkafka异步四种模式。但是在与celery和gevent连用的时候，有的模式会出错。

下面是我代码运行的结果。

结论：使用多线程方式！

使用同步方式可以成功发送数据

def send_data_kafka(data):
    try:
        client = KafkaClient(hosts=broker_list)
        topic = client.topics[topic_name]
        with topic.get_sync_producer() as producer:
            for d in data:
                print "send data"
                msg = json.dumps(d)
                producer.produce(msg)
            producer.stop()
    except Exception, e:
        LOGGER.exception("error in send_data_kafka")
        print e

使用rdkafka异步，只打印了一条send data之后卡住

def send_data_kafka(data):
    try:
        client = KafkaClient(hosts=broker_list)
        topic = client.topics[topic_name]
        with topic.get_producer(use_rdkafka=True) as producer:
            for d in data:
                print "send data"
                msg = json.dumps(d)
                producer.produce(msg)
            producer.stop()
    except Exception, e:
        LOGGER.exception("error in send_data_kafka")
        print e

使用多线程，可以正常生产所有数据

def send_data_kafka(data):
    try:
        client = KafkaClient(hosts=broker_list)
        topic = client.topics[topic_name]
        with topic.get_producer() as producer:
            for d in data:
                print "send data"
                msg = json.dumps(d)
                producer.produce(msg)
            producer.stop()
    except Exception, e:
        LOGGER.exception("error in send_data_kafka")
        print e

没有用with，rdkafka异步，打印了所有的send data，后卡住

client = KafkaClient(hosts=broker_list)
topic = client.topics[topic_name]
producer = topic.get_producer(use_rdkafka=True)  # 异步，使用rdkafka库，速度最快的方案

def send_data_kafka(data):
    try:
        for d in data:
            print "send data"
            msg = json.dumps(d)
            producer.produce(msg)
        producer.stop()
    except Exception, e:
        LOGGER.exception("error in send_data_kafka")
        print e