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操作步骤如下：
1. k8s环境下，consumer端开启mesh模式
2. consumer端需要调用多个provider
3. provider有应用级注册和接口级注册，并且需要的provider不再同一个namespace下
4. 原有项目存在dubbo2.6与3.1多版本间的相互调用，在开启消费端mesh（dubbo3.1）后，无法调用到2.6的服务提供者

**问题：**

1. 如何实现在一个consumer下，调用多个namespace下的provider，并且provider有应用级注册和接口级注册
2. dubbo3.1消费端在开启mesh后，如何调用版本是2.6的服务提供者
getScopeModel().getDeployer().start();
            synchronized (this) {
                if (ref == null) {
                    init();
                }
            }
        }
        return ref;
    }
    @Override
    public synchronized void destroy() {
        super.destroy();
        if (destroyed) {
            return;
        }
        destroyed = true;
        try {
            if (invoker != null) {
                invoker.destroy();
            }
        } catch (Throwable t) {
            logger.warn(CONFIG_FAILED_DESTROY_INVOKER, "", "", "Unexpected error occurred when destroy invoker of ReferenceConfig(" + url + ").", t);
        }
        invoker = null;
        ref = null;
        if (consumerModel != null) {
            ModuleServiceRepository repository = getScopeModel().getServiceRepository();
            repository.unregisterConsumer(consumerModel);
        }
    }