producer的代码：

kafka_addr = "n0.xxx.com:9092,n1.xxx.com:9092,n2.xxx.com:9092"
producer = KafkaProducer(bootstrap_servers=kafka_addr)

问题：
当部分broker挂掉或者网络不通（比如n2）而至少有一个broker可用时，producer报错：

getaddrinfo failed for n2.xxx.com:9092, exception was [Errno 8] nodename nor servname provided, or not known. Is your advertised.host.name correct and resolvable?

如何保证这种情况下也能正常工作？