What does service downgrade mean?

Service downgrade is when the server pressure increases sharply, some services and pages are strategically downgraded based on the current business conditions and traffic, so as to release server resources to ensure the normal operation of core tasks.

Service downgrade is when the server pressure increases sharply, some services and pages are strategically downgraded based on the current business conditions and traffic, in order to free up the server resources to ensure the normal operation of core tasks.

What is service downgrade
Service downgrade is to process less important services with low priority. To put it bluntly, it means giving up system resources to high-priority services as much as possible. Resources are limited, but requests are unlimited. If service downgrade processing is not performed during peak concurrency periods, on the one hand, it will definitely affect the performance of the overall service. In severe cases, it may lead to downtime and the unavailability of some important services. Therefore, generally during peak periods, in order to ensure the availability of core functional services of the website, certain services must be downgraded.

Service downgrade means
Denial of service
Determine the source of the application and reject service requests from low-priority applications during peak hours to ensure that core applications work normally. You can also randomly reject requests and directly report that the server is busy to avoid an influx of too many requests at the same time. This is especially used in e-commerce flash sales.

Close services
Since it is the peak period, you can close some unpopular or marginal services to give up resources to core services. For example, Taobao will close some services unrelated to the core business of ordering, such as evaluation and confirmation of delivery, during Double 11 every year to ensure that users place orders and pay normally. Of course, they will also use denial of service. Many users see this during the 0 o'clock peak period. Basically the server is busy.

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