Description

When I initialize a new consumer, if I pass an erroneous connection string via bootstrap.servers, I don't get an error. I would expect to get an error; if not at initialization, then upon poll.

How to reproduce

confluent-kafka == ('1.4.2', 17039872)
librdkafka == ('1.4.2', 17040127)

MacOS 11.1 (big sur)

import confluent_kafka as ck
config = {'bootstrap.servers': 'fake', 'group.id': 'fake'}
con = ck.Consumer(**config)
con.subscribe(['nonexistant-topic'])
con.poll(timeout=0.1)

Checklist

Please provide the following information:

• [ x] confluent-kafka-python and librdkafka version (confluent_kafka.version() and confluent_kafka.libversion()):
• Apache Kafka broker version:
• [ x] Client configuration: {...}
• [ x] Operating system:
• Provide client logs (with 'debug': '..' as necessary)
• Provide broker log excerpts
• Critical issue