官网介绍：
Because the Hive service does not have worker roles, another mechanism is needed to enable the automatic propagation of client configurations to the other hosts in your cluster. Gateway roles fulfill this function. Gateways in fact aren't really roles and do not have state, but they act as indicators for where client configurations should be placed. Hive gateways are created by default when the Hive service is added.
翻译：
由于Hive服务不具有辅助角色，因此需要其他机制来启用客户端配置自动传播到群集中的其他主机。 gateway角色执行此功能。 gateway事实上并不是真正的角色，也没有状态，但它们充当了告诉客户端配置应该放置在哪里。 添加Hive服务时，默认情况下会创建Hive网关。
相关连接：