public static void mergeAndConnectNew(List<String> allAddresses) {
        // 将一些不用的channel close掉
        removeNoneUsed(allAddresses);

        //去连接那些在etcd里有，但是list里没有的
        List<String> needConnectWorkers = newWorkers(allAddresses);
        if (needConnectWorkers.size() == 0) {
            return;
        }

        JdLogger.info(WorkerInfoHolder.class, "new workers : " + needConnectWorkers);
        //再连接，连上后，value就有值了
        NettyClient.getInstance().connect(needConnectWorkers);

        Collections.sort(WORKER_HOLDER);
    }