In fact, health codes need to be compared and monitored with dynamic data. The realization of health code depends on the operation and calculation of rule engine. To support the large-scale real-time dynamic query of billions of users, it is inseparable from the support of big data technology. From the storage point of view, the massive storage function of big data technology, close to PB-level data storage and expansion ability, can support the data storage of billion-level users of health code; From a computing point of view, the most important things here are ETL and streaming technology. Whether it is the memory computing of Spark architecture or the streaming processing mode of Flink, the computing power of thousands of servers is indispensable behind it, so the powerful computing power of Alibaba Cloud or Tencent Cloud plays a fundamental supporting role behind it.
Beijing "Health Treasure" applet is a small tool for individuals to inquire about their health status related to epidemic prevention. All people in Beijing and those who enter (return to) Beijing can use it. The query results of Beijing's "Health Treasure" applet can be used as a reference for health status in scenes such as returning to work and entering and leaving the community.