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MassagingthePony:

MessageQueuesandYouShawnRiderPBSEducationDjangoCon2010MassagingthePony:

MessageQu1WhatisaMessageQueue?Asystemforenablingasynchronousprocessingofdiscretetasks.Superawesome.WhatisaMessageQueue?Asyst2Whataretheygoodfor?AlleviateserverissuesbyoffloadingprocessingWhataretheygoodfor?Allevia3Whataretheygoodfor?MakebetteruserexperiencesWhataretheygoodfor?Makebe4Whataretheygoodfor?Increasethereliabilityofthirdpartyserviceintegrations.Whataretheygoodfor?Increas5Whataretheygoodfor?BackgroundmediaprocessingWhataretheygoodfor?Backgro6Whataretheygoodfor?RepeatingTaskscanreplaceCronjobsKeepallyourcodeinyourprojectWhataretheygoodfor?Repeat7AvailableMQSolutionsTherearemanysolutionsoutthere.Tonameafewofthem:RabbitMQAmazonSimpleQueueSystemApacheMQGearmanOpenAMQPeafowlQ4MStarlingSunJavaSystemMessageQueueAvailableMQSolutionsTherear8MessageQueueProtocolsAMQP:AdvancedMessageQueuingProtocolJMS:JavaMessagingServiceSTOMP:StreamingTextOrientedMessagingProtocolMessageQueueProtocols9CriteriaforBrokerSelectionThefollowingcriteriawereimportanttousinselectingasolution.Youmayhavesomedifferentneeds.HandlingexceptionsandrecoveryLowlevelofrequiredmaintenanceEaseofdeploymentPersistentqueuingCommunitysupportWhatlanguageisitwrittenin?Howcompatibleisthatwithourcurrentsystems?ClustersupportCriteriaforBrokerSelectionT10FailsafeMQBrokersMustbeabletosurviveaserverfailure.UponrestartingtheMQBroker,processingshouldresumefromthelastun-processedmessagesinqueuesFailsafeMQBrokers11QueueDurabilityTheMessagesQueueBrokermustbeabletoreconstructthequeueswhenitisrestarted.QueueDurabilityTheMessagesQ12MessagePersistenceTheMessages(taskstobecompleted)mustpersistbetweenshutdownsandrestartsofMQServerMessagePersistenceTheMessage13OurChoiceCelery(aDjangotaskmanagementapp)Carrot(Djangomiddleware)PyAMQP(Pythonmodule)RabbitMQ(MQBrokersoftware)OurChoice14TheProductionSystemWebappDatabaseWorkerServer(s)CeleryRabbitMQTheProductionSystemWebappDat15MQinDevelopmentEnvironsItisimportanttobeabletodevelopMessageQueuetasksinDjangowithoutbeingconcernedaboutrunningthebrokerprocess,queuesetup,persistenceetc.MQinDevelopmentEnvirons16MQinDevelopmentEnvironsCarrotcanbesetuptousedifferentqueuingbackendfordevelopmentpurposesGhettoQprovidesdatabasebackendforcarrotwhereadatabaseservesasthequeuestorageThebrokerisasimpleDjangoapplicationthatmonitorsthequeueinDBInefficient,thereforeonlysuitablefordevelopmentenvironmentsCARROT_BACKEND=‘qhettoq.taproot.Database’MQinDevelopmentEnvironsCarr17EaseafutureMQimplementationIsolatefunctionalityintoreusablecomponents.EaseafutureMQimplementatio18RecycleExistingCodeRecycleExistingCode19Django,HTTPRequests&MQMostfunctionalitiesprovidedthroughDjangoapplicationsaretightlycoupledwithHTTPrequestse.g.formdataprocessingInordertoasynchronouslyexecuteatask,Celery(anytaskmanagementplatform)mustserialize&storeparametersHTTPrequestsareusuallylargeandnoteasilyserializable.e.g.WSGIrequestsDjango,HTTPRequests&MQMost20ThePickleableHTTPRequestObjectThePickleableHTTPRequestObject21UsingPickleableHttpRequestifrequest.GET.get(‘download’):try:result=EnrollmentCSVExportTask.delay(PickleableHttpRequest(request,attributes=\[‘user’,‘a(chǎn)dmin_current_organization’]))UsingPickleableHttpRequestifr22MakingMessageQueueTasksItisfastandeasytoaddadecoratortospecificfunctionstocreateMessageQueuetasks.fromcelery.decoratorsimporttask@taskdefadd(x,y):returnx+y

MakingMessageQueueTasksIti23ExplicitlyInheritfromCelery’sTaskObjectExplicitlyInheritfromCelery24ThenWhat?SomeMessageQueuetaskscancompletewithnonotificationrequired.Forothertasks:NotifybyemailUseanAJAXlistenertonotifyusersSomeothermessagingThenWhat?SomeMessageQueuet25InReviewChooseyourMQsolutionwiselySetuparobustsystemLeverageyourexistingcodeReplacetroublespotsastheycomeupProfit!InReviewChooseyourMQsoluti26MessageQueuesMakeLifeBetterMessageQueuesMakeLifeBette27MassagingthePony:

MessageQueuesandYouShawnRiderPBSEducationDjangoCon2010MassagingthePony:

MessageQu28WhatisaMessageQueue?Asystemforenablingasynchronousprocessingofdiscretetasks.Superawesome.WhatisaMessageQueue?Asyst29Whataretheygoodfor?AlleviateserverissuesbyoffloadingprocessingWhataretheygoodfor?Allevia30Whataretheygoodfor?MakebetteruserexperiencesWhataretheygoodfor?Makebe31Whataretheygoodfor?Increasethereliabilityofthirdpartyserviceintegrations.Whataretheygoodfor?Increas32Whataretheygoodfor?BackgroundmediaprocessingWhataretheygoodfor?Backgro33Whataretheygoodfor?RepeatingTaskscanreplaceCronjobsKeepallyourcodeinyourprojectWhataretheygoodfor?Repeat34AvailableMQSolutionsTherearemanysolutionsoutthere.Tonameafewofthem:RabbitMQAmazonSimpleQueueSystemApacheMQGearmanOpenAMQPeafowlQ4MStarlingSunJavaSystemMessageQueueAvailableMQSolutionsTherear35MessageQueueProtocolsAMQP:AdvancedMessageQueuingProtocolJMS:JavaMessagingServiceSTOMP:StreamingTextOrientedMessagingProtocolMessageQueueProtocols36CriteriaforBrokerSelectionThefollowingcriteriawereimportanttousinselectingasolution.Youmayhavesomedifferentneeds.HandlingexceptionsandrecoveryLowlevelofrequiredmaintenanceEaseofdeploymentPersistentqueuingCommunitysupportWhatlanguageisitwrittenin?Howcompatibleisthatwithourcurrentsystems?ClustersupportCriteriaforBrokerSelectionT37FailsafeMQBrokersMustbeabletosurviveaserverfailure.UponrestartingtheMQBroker,processingshouldresumefromthelastun-processedmessagesinqueuesFailsafeMQBrokers38QueueDurabilityTheMessagesQueueBrokermustbeabletoreconstructthequeueswhenitisrestarted.QueueDurabilityTheMessagesQ39MessagePersistenceTheMessages(taskstobecompleted)mustpersistbetweenshutdownsandrestartsofMQServerMessagePersistenceTheMessage40OurChoiceCelery(aDjangotaskmanagementapp)Carrot(Djangomiddleware)PyAMQP(Pythonmodule)RabbitMQ(MQBrokersoftware)OurChoice41TheProductionSystemWebappDatabaseWorkerServer(s)CeleryRabbitMQTheProductionSystemWebappDat42MQinDevelopmentEnvironsItisimportanttobeabletodevelopMessageQueuetasksinDjangowithoutbeingconcernedaboutrunningthebrokerprocess,queuesetup,persistenceetc.MQinDevelopmentEnvirons43MQinDevelopmentEnvironsCarrotcanbesetuptousedifferentqueuingbackendfordevelopmentpurposesGhettoQprovidesdatabasebackendforcarrotwhereadatabaseservesasthequeuestorageThebrokerisasimpleDjangoapplicationthatmonitorsthequeueinDBInefficient,thereforeonlysuitablefordevelopmentenvironmentsCARROT_BACKEND=‘qhettoq.taproot.Database’MQinDevelopmentEnvironsCarr44EaseafutureMQimplementationIsolatefunctionalityintoreusablecomponents.EaseafutureMQimplementatio45RecycleExistingCodeRecycleExistingCode46Django,HTTPRequests&MQMostfunctionalitiesprovidedthroughDjangoapplicationsaretightlycoupledwithHTTPrequestse.g.formdataprocessingInordertoasynchronouslyexecuteatask,Celery(anytaskmanagementplatform)mustserialize&storeparametersHTTPrequestsareusuallylargeandnoteasilyserializable.e.g.WSGIrequestsDjango,HTTPRequests&MQMost47ThePickleableHTTPRequestObjectThePickleableHTTPRequestObject48UsingPickleableHttpRequestifrequest.GET.get(‘download’):try:result=EnrollmentCSVExportTask.delay(PickleableHttpRequest(

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