cpu high load with no exist group

[afeiiiii]

consumer cause high cpu load。

high load code：

    consumer = PushConsumer(group) # rocketmq group is not exist
    consumer.set_namesrv_addr(address)  
    consumer.subscribe(topic=topic, callback=callback) 
    consumer.start()

    while True:
        time.sleep(3600)

this code run with no exception ， no warning hit。

top monitor result here: