code: def get_broker_list(cluster_config):
      
      with ZK(cluster_config) as zk:
          brokers = sorted(list(zk.get_brokers().items()), key=itemgetter(0))
          return [(id, data['host']) for id, data in brokers]
docs: Returns a list of brokers in the form [(id: host)]
  
      :param cluster_config: the configuration of the cluster
      :type cluster_config: map