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¿Por qué Sidekiq no cierra las conexiones antiguas? (3)

El problema es que su actor de celuloide está perdiendo conexiones: cuando hace algo que requiere una conexión de registro activa en un nuevo hilo (o incluso aparentemente más fino), AR verifica una conexión automáticamente pero no la vuelve a registrar automáticamente.

Si usted pone entre su base de datos el código de acceso con

ActiveRecord::Base.connection_pool.with_connection do # do stuff end

eso debería aclarar las conexiones creadas dentro (como lo hace en su trabajador sidekiq).

Alternativamente, puedes probar explícitamente una conexión

@connection = ActiveRecord::Base.connection_pool.checkout

y luego revisarlo de nuevo en su finalizador

ActiveRecord::Base.connection_pool.checkin @connection

Sin embargo, si su actor tiene una vida muy larga, podría terminar acaparando la conexión más tiempo del que la necesita (la otra cara es que será ineficiente comprobar y mantener una conexión en un circuito cerrado)

La aplicación My Rails 4.1 usa Sidekiq para ejecutar mediciones en actores de celuloide. Continuamente se queda sin conexiones de base de datos. Parece que Sidekiq abre 2 conexiones por trabajo, y las conexiones antiguas nunca se cierran correctamente.

Lo que hace el sistema

  • Cada 15 minutos, comienzo un MeasurementWorker . Llamando a MeasurementWorker.perform_async(measurement.id) . Hace esto:

class MeasurementWorker include Sidekiq::Worker sidekiq_options retry: false, backtrace: true def perform(measurement_id, force = false) ActiveRecord::Base.connection_pool.with_connection do Measurement.find(measurement_id).run end end end

  • Dentro de esta medida, cuando llamo .run , hace esto:

# various checks if measurement can be run at all, using AR # ... begin ActiveRecord::Base.connection_pool.with_connection do # (I used to have a Timeout.timeout here, but removed it for the # sake of simplification) @connection = MeasurementConnection.new do |event_info| event = Event.new event.assign_attributes(event_info) event.save end while @connection.measuring?; end end # with_connection rescue Exception => e # an exception happened, e.g. something during the measurement itself # log error (left out here for brevity) else # all went fine, # save this measurement via AR ensure # Close and terminate the actor to free up the websocket, # if it is still actively measuring something. if @connection if @connection.alive? and @connection.measuring? @connection.close end while @connection.alive? @connection.terminate sleep(0.01) end end end

  • El MeasurementConnection es un simple actor de celuloide. No hay ningún código relacionado con AR dentro de este actor.

Configuración

  • Unicornio: conjunto de concurrencia a 3
  • Sidekiq 3.3.0: concurrencia establecida en 50, y en el inicializador:

Sidekiq.configure_server do |config| if defined?(ActiveRecord::Base) config = Rails.application.config.database_configuration[Rails.env] config[''pool''] = Sidekiq.options[:concurrency] + 2 config[''reaping_frequency''] = ENV[''DB_REAP_FREQ''] || 5 ActiveRecord::Base.establish_connection(config) end end

  • database.yml : conjunto de conjuntos a 60, cosechando frecuencia 5
  • PostgreSQL 9.3: las conexiones máximas son 2000, no hay otras modificaciones

El problema: demasiadas conexiones abiertas

Cuando selecciono SELECT * FROM pg_stat_activity; , Veo que hay algunas conexiones antiguas abiertas sin empleados de Sidekiq ocupados, y algunas nuevas donde están:

16661 measurement 6354 16384 measurement unicorn worker[0] -c /home/web...E production -D -l0.0.0.0:8080 127.0.0.1 50775 2015-02-20 12:52:48.572551+01 2015-02-20 13:05:05.773178+01 2015-02-20 13:05:05.773565+01 f idle SELECT COUNT(*) FROM "measurements" 16661 measurement 6406 16384 measurement unicorn worker[2] -c /home/web...E production -D -l0.0.0.0:8080 127.0.0.1 50776 2015-02-20 12:53:59.636414+01 2015-02-20 13:04:53.930305+01 2015-02-20 13:04:53.931+01 f idle SELECT COUNT(*) FROM "measurements" 16661 measurement 6687 16384 measurement sidekiq 3.3.0 measurement [0 of 50 busy] 127.0.0.1 50801 2015-02-20 13:00:05.14621+01 2015-02-20 13:04:49.558589+01 2015-02-20 13:04:49.558835+01 f idle COMMIT 16661 measurement 7042 16384 measurement unicorn worker[1] -c /home/web...E production -D -l0.0.0.0:8080 127.0.0.1 50997 2015-02-20 13:00:34.874675+01 2015-02-20 13:00:35.376593+01 2015-02-20 13:00:35.376979+01 f idle SELECT COUNT(*) FROM "measurements" 16661 measurement 6668 16384 measurement sidekiq 3.3.0 measurement [0 of 50 busy] 127.0.0.1 50781 2015-02-20 13:00:04.883553+01 2015-02-20 13:04:19.108365+01 2015-02-20 13:04:19.108567+01 f idle COMMIT 16661 measurement 6669 16384 measurement sidekiq 3.3.0 measurement [0 of 50 busy] 127.0.0.1 50782 2015-02-20 13:00:04.908349+01 2015-02-20 13:03:57.683036+01 2015-02-20 13:03:57.683236+01 f idle COMMIT 16661 measurement 6672 16384 measurement sidekiq 3.3.0 measurement [0 of 50 busy] 127.0.0.1 50786 2015-02-20 13:00:04.962251+01 2015-02-20 13:04:32.395137+01 2015-02-20 13:04:32.395344+01 f idle COMMIT 16661 measurement 6674 16384 measurement sidekiq 3.3.0 measurement [0 of 50 busy] 127.0.0.1 50788 2015-02-20 13:00:04.98456+01 2015-02-20 13:04:32.396335+01 2015-02-20 13:04:32.39652+01 f idle COMMIT 16661 measurement 6676 16384 measurement sidekiq 3.3.0 measurement [0 of 50 busy] 127.0.0.1 50790 2015-02-20 13:00:05.006847+01 2015-02-20 13:04:19.059628+01 2015-02-20 13:04:19.059831+01 f idle COMMIT 16661 measurement 6678 16384 measurement sidekiq 3.3.0 measurement [0 of 50 busy] 127.0.0.1 50792 2015-02-20 13:00:05.029448+01 2015-02-20 13:04:23.730293+01 2015-02-20 13:04:23.730523+01 f idle COMMIT 16661 measurement 6680 16384 measurement sidekiq 3.3.0 measurement [0 of 50 busy] 127.0.0.1 50794 2015-02-20 13:00:05.051932+01 2015-02-20 13:04:49.557435+01 2015-02-20 13:04:49.557633+01 f idle COMMIT 16661 measurement 6684 16384 measurement sidekiq 3.3.0 measurement [0 of 50 busy] 127.0.0.1 50798 2015-02-20 13:00:05.124225+01 2015-02-20 13:03:51.693799+01 2015-02-20 13:03:51.694034+01 f idle COMMIT 16661 measurement 6690 16384 measurement sidekiq 3.3.0 measurement [0 of 50 busy] 127.0.0.1 50804 2015-02-20 13:00:05.168099+01 2015-02-20 13:04:54.849239+01 2015-02-20 13:04:54.849459+01 f idle COMMIT 16661 measurement 6693 16384 measurement sidekiq 3.3.0 measurement [0 of 50 busy] 127.0.0.1 50807 2015-02-20 13:00:05.189661+01 2015-02-20 13:04:18.688459+01 2015-02-20 13:04:18.688732+01 f idle COMMIT 16661 measurement 6696 16384 measurement sidekiq 3.3.0 measurement [0 of 50 busy] 127.0.0.1 50810 2015-02-20 13:00:05.210659+01 2015-02-20 13:03:57.68424+01 2015-02-20 13:03:57.684483+01 f idle COMMIT 16661 measurement 6699 16384 measurement sidekiq 3.3.0 measurement [0 of 50 busy] 127.0.0.1 50813 2015-02-20 13:00:05.231641+01 2015-02-20 13:04:04.962397+01 2015-02-20 13:04:04.96258+01 f idle COMMIT 16661 measurement 6701 16384 measurement sidekiq 3.3.0 measurement [0 of 50 busy] 127.0.0.1 50815 2015-02-20 13:00:05.252357+01 2015-02-20 13:04:41.685372+01 2015-02-20 13:04:41.685594+01 f idle COMMIT 16661 measurement 6706 16384 measurement sidekiq 3.3.0 measurement [0 of 50 busy] 127.0.0.1 50820 2015-02-20 13:00:05.273301+01 2015-02-20 13:04:23.733488+01 2015-02-20 13:04:23.733681+01 f idle COMMIT 16661 measurement 7003 16384 measurement sidekiq 3.3.0 measurement [15 of 50 busy] 127.0.0.1 50967 2015-02-20 13:00:09.004487+01 2015-02-20 13:02:02.036429+01 2015-02-20 13:02:02.036696+01 f idle COMMIT 16661 measurement 7005 16384 measurement sidekiq 3.3.0 measurement [15 of 50 busy] 127.0.0.1 50969 2015-02-20 13:00:11.118961+01 2015-02-20 13:02:48.341078+01 2015-02-20 13:02:48.341294+01 f idle COMMIT 16661 measurement 7006 16384 measurement sidekiq 3.3.0 measurement [15 of 50 busy] 127.0.0.1 50970 2015-02-20 13:00:12.245408+01 2015-02-20 13:03:04.300372+01 2015-02-20 13:03:04.300575+01 f idle COMMIT 16661 measurement 7007 16384 measurement sidekiq 3.3.0 measurement [15 of 50 busy] 127.0.0.1 50971 2015-02-20 13:00:12.648636+01 2015-02-20 13:03:01.855616+01 2015-02-20 13:03:01.85588+01 f idle COMMIT 16661 measurement 7008 16384 measurement sidekiq 3.3.0 measurement [15 of 50 busy] 127.0.0.1 50972 2015-02-20 13:00:12.956139+01 2015-02-20 13:03:13.840023+01 2015-02-20 13:03:13.840466+01 f idle COMMIT 16661 measurement 7009 16384 measurement sidekiq 3.3.0 measurement [15 of 50 busy] 127.0.0.1 50973 2015-02-20 13:00:13.02424+01 2015-02-20 13:02:50.115996+01 2015-02-20 13:02:50.116259+01 f idle COMMIT 16661 measurement 7010 16384 measurement sidekiq 3.3.0 measurement [15 of 50 busy] 127.0.0.1 50974 2015-02-20 13:00:13.0909+01 2015-02-20 13:03:09.968+01 2015-02-20 13:03:09.968284+01 f idle COMMIT 16661 measurement 7014 16384 measurement sidekiq 3.3.0 measurement [15 of 50 busy] 127.0.0.1 50976 2015-02-20 13:00:14.929822+01 2015-02-20 13:03:20.183195+01 2015-02-20 13:03:20.183467+01 f idle COMMIT 16661 measurement 7020 16384 measurement sidekiq 3.3.0 measurement [15 of 50 busy] 127.0.0.1 50980 2015-02-20 13:00:22.498892+01 2015-02-20 13:03:29.887257+01 2015-02-20 13:03:29.887599+01 f idle COMMIT 16661 measurement 7021 16384 measurement sidekiq 3.3.0 measurement [15 of 50 busy] 127.0.0.1 50981 2015-02-20 13:00:22.898087+01 2015-02-20 13:03:39.689939+01 2015-02-20 13:03:39.69798+01 f idle COMMIT 16661 measurement 7022 16384 measurement sidekiq 3.3.0 measurement [15 of 50 busy] 127.0.0.1 50982 2015-02-20 13:00:23.215846+01 2015-02-20 13:03:03.918339+01 2015-02-20 13:03:03.918613+01 f idle COMMIT 16661 measurement 7023 16384 measurement sidekiq 3.3.0 measurement [15 of 50 busy] 127.0.0.1 50983 2015-02-20 13:00:23.930861+01 2015-02-20 13:03:51.504525+01 2015-02-20 13:03:51.512786+01 f idle COMMIT 16661 measurement 7025 16384 measurement sidekiq 3.3.0 measurement [15 of 50 busy] 127.0.0.1 50985 2015-02-20 13:00:24.409999+01 2015-02-20 13:03:16.000375+01 2015-02-20 13:03:16.006178+01 f idle COMMIT 16661 measurement 7027 16384 measurement sidekiq 3.3.0 measurement [15 of 50 busy] 127.0.0.1 50986 2015-02-20 13:00:25.786321+01 2015-02-20 13:03:22.631091+01 2015-02-20 13:03:22.631353+01 f idle COMMIT 16661 measurement 7045 16384 measurement sidekiq 3.3.0 measurement [15 of 50 busy] 127.0.0.1 50998 2015-02-20 13:00:48.004036+01 2015-02-20 13:03:39.717124+01 2015-02-20 13:03:39.722956+01 f idle COMMIT

En total, hay 34 conexiones, pero solo hice 15 mediciones.

En sidekiq.log , todos se muestran como hechos :

2015-02-20T12:00:04.879Z 6235 TID-osgop8md0 MeasurementWorker JID-1cdcd44bf41fefe9ddca21ac INFO: start 2015-02-20T12:00:04.907Z 6235 TID-osgoox8hg MeasurementWorker JID-79f4d1ff6692248682ba93dd INFO: start 2015-02-20T12:00:04.939Z 6235 TID-osgoos38k MeasurementWorker JID-09f95fbccd2438d17916d425 INFO: start 2015-02-20T12:00:04.940Z 6235 TID-osgoorlmo MeasurementWorker JID-be1a57871f26146e9884107e INFO: start 2015-02-20T12:00:04.959Z 6235 TID-osgoow16k MeasurementWorker JID-e296efec897c23629b96e99f INFO: start 2015-02-20T12:00:04.968Z 6235 TID-osgoouytg MeasurementWorker JID-c6a57700872b7fe427e33664 INFO: start 2015-02-20T12:00:04.984Z 6235 TID-osgooz63k MeasurementWorker JID-f7448eaffe109882130497ca INFO: start 2015-02-20T12:00:04.998Z 6235 TID-osgoozvzs MeasurementWorker JID-c55c04f3424268fba50ec048 INFO: start 2015-02-20T12:00:05.014Z 6235 TID-osgooyr6c MeasurementWorker JID-01bd303e953fd2998fe3f8d1 INFO: start 2015-02-20T12:00:05.030Z 6235 TID-osgon0ums MeasurementWorker JID-6949c5c81b4c254046f0c585 INFO: start 2015-02-20T12:00:05.042Z 6235 TID-osgomw0g8 MeasurementWorker JID-cc03b717f81dd6fb0f58a946 INFO: start 2015-02-20T12:00:05.111Z 6235 TID-osgomlno8 MeasurementWorker JID-10eebcd76113f3565d8265ca INFO: start 2015-02-20T12:00:05.113Z 6235 TID-osgomjzzw MeasurementWorker JID-b0536d9a029faed0ba8eb5d3 INFO: start 2015-02-20T12:00:05.114Z 6235 TID-osgomhyms MeasurementWorker JID-1f6624314afd8e0ae611599f INFO: start 2015-02-20T12:00:05.115Z 6235 TID-osgolgzoc MeasurementWorker JID-24e87960d7e7fbd871037dd3 INFO: start 2015-02-20T12:02:02.333Z 6235 TID-osgomw0g8 MeasurementWorker JID-cc03b717f81dd6fb0f58a946 INFO: done: 117.291 sec 2015-02-20T12:02:48.983Z 6235 TID-osgoox8hg MeasurementWorker JID-79f4d1ff6692248682ba93dd INFO: done: 164.077 sec 2015-02-20T12:02:50.688Z 6235 TID-osgomlno8 MeasurementWorker JID-10eebcd76113f3565d8265ca INFO: done: 165.577 sec 2015-02-20T12:03:02.429Z 6235 TID-osgolgzoc MeasurementWorker JID-24e87960d7e7fbd871037dd3 INFO: done: 177.314 sec 2015-02-20T12:03:04.581Z 6235 TID-osgoorlmo MeasurementWorker JID-be1a57871f26146e9884107e INFO: done: 179.641 sec 2015-02-20T12:03:09.453Z 6235 TID-osgop8md0 MeasurementWorker JID-1cdcd44bf41fefe9ddca21ac INFO: done: 184.573 sec 2015-02-20T12:03:10.362Z 6235 TID-osgoouytg MeasurementWorker JID-c6a57700872b7fe427e33664 INFO: done: 185.394 sec 2015-02-20T12:03:14.232Z 6235 TID-osgomjzzw MeasurementWorker JID-b0536d9a029faed0ba8eb5d3 INFO: done: 189.118 sec 2015-02-20T12:03:16.347Z 6235 TID-osgoos38k MeasurementWorker JID-09f95fbccd2438d17916d425 INFO: done: 191.408 sec 2015-02-20T12:03:20.398Z 6235 TID-osgoow16k MeasurementWorker JID-e296efec897c23629b96e99f INFO: done: 195.439 sec 2015-02-20T12:03:22.947Z 6235 TID-osgomhyms MeasurementWorker JID-1f6624314afd8e0ae611599f INFO: done: 197.833 sec 2015-02-20T12:03:30.212Z 6235 TID-osgooz63k MeasurementWorker JID-f7448eaffe109882130497ca INFO: done: 205.228 sec 2015-02-20T12:03:39.931Z 6235 TID-osgooyr6c MeasurementWorker JID-01bd303e953fd2998fe3f8d1 INFO: done: 214.918 sec 2015-02-20T12:03:39.936Z 6235 TID-osgon0ums MeasurementWorker JID-6949c5c81b4c254046f0c585 INFO: done: 214.906 sec 2015-02-20T12:03:51.694Z 6235 TID-osgoozvzs MeasurementWorker JID-c55c04f3424268fba50ec048 INFO: done: 226.696 sec

Entonces, para cada medida, Sidekiq parece abrir 2 conexiones, pero nunca las cierra. ¿Qué tengo que hacer?

Elimina Timeout.timeout , nunca uses esa API. Utilice with_connection . Timeout.timeout está terriblemente interrumpido y se divide internamente en su propio hilo, por lo que su with_connection no funciona y las conexiones aún tienen pérdidas.

Trabajé con sidekiq recientemente e hice esto:

def perform(bulk_query) ActiveRecord::Base.connection_pool.with_connection do |connection| connection.execute(bulk_query) end ensure # We make sure sidekiq closes the ActiveRecord connection ActiveRecord::Base.clear_active_connections! ActiveRecord::Base.connection.close end

¡Está funcionando muy bien para mí!