/* connect to cluster through admin port */
if(logger.isInfoEnabled()) {
logger.info("Connecting to bootstrap server: " + url);
}
AdminClient adminClient = new AdminClient(url,
new AdminClientConfig(),
new ClientConfig());
adminClients.add(adminClient);
/* get Cluster */
Cluster cluster = adminClient.getAdminClientCluster();
clusterMap.put(url, cluster);