try {
res = storageSource.executeQuery(CONTROLLER_TABLE_NAME,
cols, null, null);
while (res.next()) {
String controllerId = res.getString(CONTROLLER_ID);
if (!res.containsColumn(CONTROLLER_SYNC_ID) ||
!res.containsColumn(CONTROLLER_SYNC_DOMAIN_ID) ||
!res.containsColumn(CONTROLLER_SYNC_PORT)) {
logger.debug("No sync data found for {}", controllerId);
continue;
}