String instanceName = host + "_" + port;
InstanceConfig config = new InstanceConfig(instanceName);
config.setHostName(host);
config.setPort(Integer.toString(port));
config.getRecord().setSimpleField("IPC_PORT", Integer.toString(ipcPort));
admin.addInstance(CLUSTER_NAME, config);
_socketMap.put(instanceName, new InetSocketAddress(host, ipcPort));
_participants[i] = new MockParticipant(_zkaddr, CLUSTER_NAME, instanceName);
_participants[i].syncStart();
}