Availability: load balancing is achieved by reverse proxy and diversion, from the avalanche disaster by limiting protection services, and partially available through downgrade, to the detriment service, fault isolation by isolation, by setting a reasonable timeout and retry mechanism to avoid request accumulation caused by avalanches, quick fixes through the wrong version rollback mechanism.
High concurrency: stateless applications, reasonable resolution, as a service, the message queue, heterogeneous data cache silver bullet of concurrency.