In the previous chapter, through the study of GFS, we have gained a basic understanding of distributed file systems. In the following chapters, we will teach you how to implement a distributed key-value storage system, eraftkv, built on the strongly consistent algorithm Raft. The eraftkv is a distributed key-value storage system implemented in the Go language. The Go language benefits from the design of goroutines and channels, making it more convenient for network programming in distributed systems. Programming in Go under high-concurrency environments ensures that the logic is simple and clear, while performance can also be guaranteed to a certain extent. This is the reason for using the Go language to build distributed systems. Before delving into the implementation details of eraftkv, we will first introduce the basic knowledge of the Go language.