Redis + ActionController::Live threads not dying

Question

Background: We\'ve built a chat feature in to one of our existing Rails applications. We\'re using the new ActionController::Live module and ru

Answer 1

Building on @James Boutcher, I used the following in clustered Puma with 2 workers, so that I have only 1 thread created for the heartbeat in config/initializers/redis.rb:

config/puma.rb

on_worker_boot do |index|
  puts "worker nb #{index.to_s} booting"
  create_heartbeat if index.to_i==0
end

def create_heartbeat
  puts "creating heartbeat"
  $redis||=Redis.new
  heartbeat = Thread.new do
    ActiveRecord::Base.connection_pool.release_connection
    begin
      while true
        hash={event: "heartbeat",data: "heartbeat"}
        $redis.publish("heartbeat",hash.to_json)
        sleep 20.seconds
      end
    ensure
      #no db connection anyway
    end
  end
end