Tengo una aplicación de rieles en producción que implementé algunos cambios el otro día. De repente, me sale el errorActiveRecord::ConnectionTimeoutError: could not obtain a database connection within 5.000 seconds (waited 5.000 seconds) varias veces al día y tiene que reiniciar puma para solucionar el problema.

Estoy completamente perplejo en cuanto a lo que está causando esto. No cambié nada en mi servidor y los cambios que hice fueron bastante simples (agregar a una vista y agregar a un método de controlador).

No veo mucho de nada en los archivos de registro.

Estoy usando rails 4.1.4 y ruby 2.0.0p481

¿Alguna idea de por qué mis conexiones se están llenando? Mi grupo de conexiones está configurado en 10 y estoy usando la configuración predeterminada de puma.

Aquí hay un seguimiento de la pila:

ActiveRecord::ConnectionTimeoutError (could not obtain a database connection within 5.000 seconds (waited 5.000 seconds)):
  activerecord (4.1.4) lib/active_record/connection_adapters/abstract/connection_pool.rb:190:in `block in wait_poll'
  activerecord (4.1.4) lib/active_record/connection_adapters/abstract/connection_pool.rb:181:in `loop'
  activerecord (4.1.4) lib/active_record/connection_adapters/abstract/connection_pool.rb:181:in `wait_poll'
  activerecord (4.1.4) lib/active_record/connection_adapters/abstract/connection_pool.rb:136:in `block in poll'
  /usr/local/rvm/rubies/ruby-2.0.0-p481/lib/ruby/2.0.0/monitor.rb:211:in `mon_synchronize'
  activerecord (4.1.4) lib/active_record/connection_adapters/abstract/connection_pool.rb:146:in `synchronize'
  activerecord (4.1.4) lib/active_record/connection_adapters/abstract/connection_pool.rb:134:in `poll'
  activerecord (4.1.4) lib/active_record/connection_adapters/abstract/connection_pool.rb:418:in `acquire_connection'
  activerecord (4.1.4) lib/active_record/connection_adapters/abstract/connection_pool.rb:351:in `block in checkout'
  /usr/local/rvm/rubies/ruby-2.0.0-p481/lib/ruby/2.0.0/monitor.rb:211:in `mon_synchronize'
  activerecord (4.1.4) lib/active_record/connection_adapters/abstract/connection_pool.rb:350:in `checkout'
  activerecord (4.1.4) lib/active_record/connection_adapters/abstract/connection_pool.rb:265:in `block in connection'
  /usr/local/rvm/rubies/ruby-2.0.0-p481/lib/ruby/2.0.0/monitor.rb:211:in `mon_synchronize'
  activerecord (4.1.4) lib/active_record/connection_adapters/abstract/connection_pool.rb:264:in `connection'
  activerecord (4.1.4) lib/active_record/connection_adapters/abstract/connection_pool.rb:541:in `retrieve_connection'
  activerecord (4.1.4) lib/active_record/connection_handling.rb:113:in `retrieve_connection'
  activerecord (4.1.4) lib/active_record/connection_handling.rb:87:in `connection'
  activerecord (4.1.4) lib/active_record/query_cache.rb:51:in `restore_query_cache_settings'
  activerecord (4.1.4) lib/active_record/query_cache.rb:43:in `rescue in call'
  activerecord (4.1.4) lib/active_record/query_cache.rb:32:in `call'
  activerecord (4.1.4) lib/active_record/connection_adapters/abstract/connection_pool.rb:621:in `call'
  actionpack (4.1.4) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
  activesupport (4.1.4) lib/active_support/callbacks.rb:82:in `run_callbacks'
  actionpack (4.1.4) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
  actionpack (4.1.4) lib/action_dispatch/middleware/remote_ip.rb:76:in `call'
  airbrake (4.1.0) lib/airbrake/rails/middleware.rb:13:in `call'
  actionpack (4.1.4) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
  actionpack (4.1.4) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
  railties (4.1.4) lib/rails/rack/logger.rb:38:in `call_app'
  railties (4.1.4) lib/rails/rack/logger.rb:20:in `block in call'
  activesupport (4.1.4) lib/active_support/tagged_logging.rb:68:in `block in tagged'
  activesupport (4.1.4) lib/active_support/tagged_logging.rb:26:in `tagged'
  activesupport (4.1.4) lib/active_support/tagged_logging.rb:68:in `tagged'
  railties (4.1.4) lib/rails/rack/logger.rb:20:in `call'
  actionpack (4.1.4) lib/action_dispatch/middleware/request_id.rb:21:in `call'
  rack (1.5.2) lib/rack/methodoverride.rb:21:in `call'
  dragonfly (1.0.5) lib/dragonfly/cookie_monster.rb:9:in `call'
  rack (1.5.2) lib/rack/runtime.rb:17:in `call'
  activesupport (4.1.4) lib/active_support/cache/strategy/local_cache_middleware.rb:26:in `call'
  rack (1.5.2) lib/rack/sendfile.rb:112:in `call'
  airbrake (4.1.0) lib/airbrake/user_informer.rb:16:in `_call'
  airbrake (4.1.0) lib/airbrake/user_informer.rb:12:in `call'
  railties (4.1.4) lib/rails/engine.rb:514:in `call'
  railties (4.1.4) lib/rails/application.rb:144:in `call'
  railties (4.1.4) lib/rails/railtie.rb:194:in `public_send'
  railties (4.1.4) lib/rails/railtie.rb:194:in `method_missing'
  puma (2.9.0) lib/puma/configuration.rb:71:in `call'
  puma (2.9.0) lib/puma/server.rb:490:in `handle_request'
  puma (2.9.0) lib/puma/server.rb:361:in `process_client'
  puma (2.9.0) lib/puma/server.rb:254:in `block in run'
  puma (2.9.0) lib/puma/thread_pool.rb:92:in `call'
  puma (2.9.0) lib/puma/thread_pool.rb:92:in `block in spawn_thread'

Puma init.d script

#!/bin/sh
# Starts and stops puma
#


case "$1" in
        start)
                su myuser -c  "source /etc/profile && cd /var/www/myapp/current && rvm gemset use myapp && puma -d -e production -b unix:///var/www/myapp/myapp_app.sock -S /var/www/myapp/myapp_app.state"
        ;;

        stop)
                su myuser -c "source /etc/profile && cd /var/www/myapp/current &&  rvm gemset use myapp && RAILS_ENV=production bundle exec pumactl -S /var/www/myapp/myapp_app.state stop"
        ;;

        restart)
                $0 stop
                $0 start
        ;;

        *)
                echo "Usage: $0 {start|stop|restart}"
                exit 1
esac

EDITAR

Creo que finalmente he reducido el problema a sercon elFreno de aire joya y utilizando laidear métodocurrent_user ouser_signed_in? enapplication_controller.rb en unbefore_action.

Aquí está mi controlador de aplicación:

class ApplicationController < ActionController::Base
  protect_from_forgery
  before_filter :authenticate_user!, :get_new_messages 

  # Gets the unread messages for the logged in user
  def get_new_messages
    @num_new_messages = 0 # Initially set to 0 so login page, etc works
    # If the user is signed in, fetch the new messages
    if user_signed_in? # I also tried !current_user.nil?
      @num_new_messages = Message.where(:created_for => current_user.id).where(:viewed => false).count
    end
  end

...
end

Si elimino elif Bloque, no tengo problemas. Desde que presenté ese código, mi aplicación parece quedarse sin conexiones. Si dejo esoif bloquee en su lugar y elimine la gema del freno de aire, mi aplicación parece funcionar bien con solo las 5 conexiones predeterminadas establecidas en mi grupo en midatabase.yml archivo.

EDITAR

Finalmente me doy cuenta de que si comento esta línea en miconfig/environments/production.rb archivoconfig.exceptions_app = self.routes que no me sale el error Parece que las rutas personalizadas + idean en el controlador de la aplicación before_action son la causa. He creado un problema y un proyecto reproducible en github.

https://github.com/plataformatec/devise/issues/3422 https://github.com/toymachiner62/devise-connection-failure/blob/master/config/environments/production.rb#L84