kafka-python使用者未收到消息 [英] kafka-python consumer not receiving messages

问题描述

我在使用 KafaConsumer 时遇到麻烦，无法使其从开头或从其他任何显式偏移量读取.

I am having trouble with KafaConsumer to make it read from the beginning, or from any other explicit offset.

针对相同的主题为使用者运行命令行工具，我确实看到带有-from-beginning 选项的消息，否则挂起

Running the command line tools for the consumer for the same topic , I do see messages with the --from-beginning option and it hangs otherwise

$ ./kafka-console-consumer.sh --zookeeper {localhost:port} --topic {topic_name} --from-beginning

如果我通过python运行它，它会挂起，我怀疑是由错误的使用者配置引起的

If I run it through python, it hangs, which I suspect to be caused by incorrect consumer configs

consumer = KafkaConsumer(topic_name,
                     bootstrap_servers=['localhost:9092'],
                     group_id=None,
                     auto_commit_enable=False,
                     auto_offset_reset='smallest')

print "Consuming messages from the given topic"
for message in consumer:
    print "Message", message
    if message is not None:
        print message.offset, message.value

print "Quit"

输出:

消费来自给定主题的消息(之后挂起)

Output:

Consuming messages from the given topic (hangs after that)

我正在使用kafka-python 0.9.5，并且代理运行kafka 8.2.不知道确切的问题是什么.

I am using kafka-python 0.9.5 and the broker runs kafka 8.2. Not sure what the exact problem is.

按照dpkp的建议设置_group_id = None_来模拟控制台使用者的行为.

Set _group_id=None_ as suggested by dpkp to emulate the behavior of console consumer.

推荐答案

控制台消费者和您发布的python消费者代码之间的区别是python消费者使用消费者组来保存偏移量: group_id =测试消费者组" .相反，如果您设置group_id = None，则应该看到与控制台使用者相同的行为.

The difference between the console-consumer and the python consumer code you have posted is the python consumer uses a consumer group to save offsets: group_id="test-consumer-group" . If instead you set group_id=None, you should see the same behavior as the console consumer.

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