Apache SkyWalking provides a very powerful and lightweight backends. In here, I am going to introduce why we design it in these ways and how does it work.

In many big systems, distributed and especially microservice architectures become more and more popular. With the increase of modules and services, one incoming request could cross dozens of service. How to pinpoint the issues of the online system, and the bottleneck of the whole distributed system? This became a very important problem, which must be resolved.