func getActiveUserInzone(appid uint16, zone uint16) ([]*session.UserSession, error) {

	var resp []*session.UserSession

	keyname := fmt.Sprintf(userStatSetKey, appid, zone)

	userids, err := SessionPool.Call(getSessionAddr(keyname)).SMEMBERS(keyname)
	if err != nil {
		return resp, errors.New(keyname + ":" + err.Error())
	}

	appidstr := strconv.FormatUint(uint64(appid), 10)

	for _, userid := range userids {
		masterkey := fmt.Sprintf(usersessionmasterkey, userid, appidstr)

		if secondkeys, err := SessionPool.Call(getSessionAddr(masterkey)).SMEMBERS(masterkey); err != nil {
			Logger.Error(userid, appidstr, "", "getActiveUserInzone", "SMEMBERS masterkey error", "")
			continue
		} else {
			for _, secondkey := range secondkeys {
				props, err := SessionPool.Call(getSessionAddr(masterkey)).HGETALLMAP(string(secondkey))
				if err != nil && err != msgRedis.ErrKeyNotExist {
					continue //must not be here
				}

				if err == nil {
					userSession, err := prop2usersession(props)
					if err == nil {
						resp = append(resp, userSession)
					}
				}
			}
		}
	}

	return resp, nil
}