Sharding

A sharding example using the greeter application and a X-From-User header as the sharding key

Contents

• api.go - a modified version of the greeter api to include sharding

Deps

Service discovery is required for all services. Default is Consul or MDNS. You can also use plugins from micro/plugins.

MDNS

Use the flag --registry=mdns

Consul

brew install consul
consul agent -dev

Micro

go get github.com/micro/micro

Run

Greeter Service

Run multiple copies of the greeter

cd ../greeter
go run srv/main.go

Greeter API

go run api.go

Micro API

micro api

Call API

Call the API with X-From-User header. Change the user to see the effects of sharding.

curl  -H "X-From-User: john" http://localhost:8080/greeter/say/hello?name=John