improbable-eng/go-srvlb

Name: go-srvlb

Owner: Improbable Engineering

Description: DNS SRV Load Balancer for gRPC

Created: 2016-11-29 09:48:28.0

Updated: 2018-01-15 02:41:10.0

Pushed: 2018-01-10 17:35:45.0

Homepage: null

Size: 24

Language: Go

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README

Go gRPC DNS SRV Load Balancer

A gRPC naming.Resolver that uses DNS SRV. This allows you to do simple client-side Round Robin load balancing of gRPC requests.

Usage

= grpc.RoundRobin(grpcsrvlb.New(srv.NewGoResolver(2 * time.Second)))
, err := grpc.Dial("grpc.my_service.my_cluster.internal.example.com", grpc.WithBalancer(rr))

This will resolve the DNS SRV address grpc.my_service.my_cluster.internal.example.com using the Golang DNS resolver with an assumed TTL of 2 seconds and use that as a set of backends for the gRPC RoundRobin policy. From this point on all requests on the conn (reusable across gRPC clients) will be load balanced to a set of these backends.

Status

This is alpha software. It should work, but key components are missing:

• [ ] unit tests
• [ ] integration tests with gRPC
• [ ] srv.Resolver implementation that respects TTL, see miekg/dns

License

go-srvlb is released under the Apache 2.0 license. See the LICENSE file for details.