Writer's Reader Discarded

This is a project that aims to reproduce linkerd's This writer's reader has been discarded HTTP 502 error.

client is a Java client that makes a request to server via linkerd, in a linker-to-linker configuration. It needs to be built with:

cd client
gradle build

server is a Go server that simply returns HTTP 200 with body done.

IMPORTANT: change linkerd.yml:23 and disco/server:1 to use the IP address of the machine the project is running on.

Once the client is built, simply run docker-compose build and then docker-compose up.

Request flow:

1. client initiates request to http://linkerd:4141/server
2. linkerd is found via the Docker network (default), by container name
3. The outgoing linkerd router listening on 4141 looks up server in the namer (io.l5d.fs)
4. Once the IP address and port is found, the port is tranformed to 4041 via a io.l5d.port transformer
5. The request is sent to http://$ipAddress:4041, passing l5d-dst-service: /in/out/server HTTP header
6. The incoming linkerd router listening on 4041 looks up server in the namer (io.l5d.fs)
7. Any returned host returned by the namer that is not the one specified in the io.l5d.specificHost transformer is excluded
8. The request is sent to http://$ipAddress:8000, which is where the server is listening on
9. The server immediately returns HTTP 200 with response body done
10. Once the client receives the response, start agin from point 1. until the This writer's reader has been discarded HTTP 502 error occurs.

The first failing request is usually within the first 30 seconds.