Huawei Cloud MapReduce Service MRS provides a real-time distributed computing framework for analyzing and computing massive real-time data streams. In the elevator network industry, smart elevator…

Huawei Cloud MapReduce Service MRS provides a real-time distributed computing framework for analyzing and computing massive real-time data streams. In the elevator network industry, smart elevator data can be uploaded to the MRS streaming cluster for real-time monitoring. In this scenario, the system needs to support access from massive data sources and collect data in real time. When planning this MRS cluster, which of the following components should be included? (Multiple choice)