在 C# 中使用 gRPC 子通道进行负载平衡

Question

I'd like to do simple client side load balancing for grpc as described here .

I'm using Microsoft Azure Service Fabric so getting a list of the available endpoints is trivial, but I can't find an API to add sub-channels to the C# Channel class. Is adding sub-channels possible with the C# client? If not what would be the best solution for implementing this.

Answer 1

If you set

channelOptions.Add(new ChannelOption("grpc.lb_policy_name", "round_robin"));

the GRPC C# client will automatically open subchannels for each A record that's resolved by the DNS request, and will route across them appropriately.

A good example of GRPC loadbalancing in C# (although for Kubernetes, not service fabric) is this example repo from Jan Tattermusch's Kubecon talk a few years ago.