Distributed Services with Go

Load Balance on the Client in gRPC

Though the ideas we’ll talk about in this chapter can apply to any client and server, because our service is a gRPC service, we’ll use those terms. gRPC separates server discovery, load balancing, and client requests and response handling—often the only code you’ll write is the latter. In gRPC, resolvers discover servers and pickers load balance by picking what server will handle the current request. gRPC also has balancers that manage subconnections but defer the load balancing to the pickers. gRPC provides an API (base.NewBalancerBuilderV2) to create a base balancer, but you probably won’t have to write your own balancer.

When you call grpc.Dial, gRPC takes the address and passes it on to the resolver, and ...