Pass is a social App based on location. Users can find interested strangers nearby anytime and anywhere, and share new things with friends through dynamic pictures. Since it was launched in mid-20 13, it has developed very rapidly. In just over a year, it has accumulated more than 30 million users around the world.

SaaS is the abbreviation of software as a service, which means software as a service, that is, providing software services through the network. SaaS platform vendors deploy application software on their own servers, and customers can work according to their actual needs.

Order the required application software services from vendors through the Internet, pay the vendors according to the quantity and duration of the ordered services, and obtain the services provided by Saas platform providers through the Internet.

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SaaS services usually provide services to hundreds of different customers (also called tenants) based on standard software systems. This requires SaaS services to support data and configuration isolation between different tenants, so as to ensure the security and privacy of each tenant's data, as well as the personalized needs of users such as interface, business logic and data structure.

Because SaaS supports multiple tenants at the same time, each tenant has many users, which poses a great challenge to the performance, stability and scalability of the infrastructure platform supporting software. As an Internet-based software delivery model, the core task of SaaS is to optimize the performance and operating cost of software after large-scale application.