Is Selenium Grid 4 compatible with v3 clients?

Question

Before I spent hours in setting up a Selenium v4 Grid, can someone confirm it is backward compatibility with existing clients?

I was not able to find anything in official documentation, nor in my searches.

We have an on-premises v3 implementation and all clients (mostly .NET and Java) are v3, so I am assessing the migration effort.

Answer 1

Java project set up using Selenium 3.141.59 works with Selenium Grid 4.0.0.

All browsers work with the remote selenium grid except EdgeChromium. That requires you to migrate your project to Selenium 4.0.0

Below is my simple docker-compose setup for a small project using Selenium Grid 4.0.0 where we test using the latest chrome browser

version: "3"
services:
  selenium-hub-1:
    image: selenium/hub:4.0.0
    container_name: selenium-hub-1
    ports:
      - "4442:4442"
      - "4443:4443"
      - "4444:4444"
  chrome-1:
    image: selenium/node-chrome:latest
    container_name: chrome-1
    depends_on:
      - selenium-hub-1
    extra_hosts:
      - "dev-centos8:192.168.101.102"
      - "dev:192.168.101.102"
    environment:
      - SE_EVENT_BUS_HOST=selenium-hub-1
      - SE_EVENT_BUS_PUBLISH_PORT=4442
      - SE_EVENT_BUS_SUBSCRIBE_PORT=4443
    volumes:
      - /downloads:/downloads
      - /apps/functional-test:/apps/functional-test