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master scheduler

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Managing PeopleSoft Master Scheduler Servers This chapter provides an overview of PeopleSoft Master Scheduler functions and discusses: Circumstances in which a Master Scheduler is required. How to use multiple Master Schedulers. Master Scheduler request prioritization. How to manage workload across servers. Understanding PeopleSoft Master Scheduler Functions A Master Scheduler enables load balancing of workload by automatically routing requests to available Process Scheduler servers, which ensures that you maintain optimal processing at all times. This feature also offers fault tolerance in your batch environment. In the event of a server failure, a Master Scheduler can redistribute queued requests among the remaining active Process Scheduler servers. In addition, an active Master Scheduler manages and controls all Process Scheduler server domains that are on the same PeopleSoft database. It enforces all of the rules that are specified in either the process or job definitions, and monitors the running of all processes. It becomes the centralized control as it checks the Process Request table looking for any queued requests to run, and then dispatches them to an appropriate available Process Scheduler server. A Master Scheduler can be activated in any of the Process Scheduler servers in Microsoft Windows and UNIX. This option is enabled by default when you are configuring a new Process Scheduler server in Windows and UNIX. However, this option is not available in the IBM UNIX System Services (USS). For DB2/OS390 customers who intend to start a Process Scheduler in USS and want to take advantage of this feature, a Process Scheduler server domain must be set up in either a Microsoft Windows or supported UNIX operating system other than USS. Disadvantages of Using Multiple Process Schedulers with No Master Scheduler When a Master Scheduler is not used, each Process Scheduler server that is brought up is responsible for managing its own workload by querying the Process Request table. This can be problematic when multiple Process Scheduler servers are booted for the same database. Each server attempts to schedule requests that are specified to run either on this specific server or any server. If any request is set to run on any server, more than one server may attempt to schedule the same request. To resolve this, specify a specific server through the Process Request page. However, this becomes disadvantageous if the specified server goes down because the request remains queued until the Process Scheduler server is brought up again. One other disadvantage of bringing up multiple Process Scheduler servers without using a Master Scheduler is the uneven balance of workload across all servers. PeopleSoft Process Scheduler is constrained to have new requests scheduled with no server name to be picked up only by servers that are running in the operating system that is specified as the Primary Operating System on the System Settings page. This diagram illustrates this option:

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Peoplesoft Master Scheduler

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  • 10/04/2015 EnterprisePeopleTools8.50PeopleBook:PeopleSoftProcessScheduler

    http://docs.oracle.com/cd/E15645_01/pt850pbr0/eng/psbooks/tprs/htm/tprs12.htm 1/6

    ManagingPeopleSoftMasterSchedulerServersThischapterprovidesanoverviewofPeopleSoftMasterSchedulerfunctionsanddiscusses:

    CircumstancesinwhichaMasterSchedulerisrequired.

    HowtousemultipleMasterSchedulers.

    MasterSchedulerrequestprioritization.

    Howtomanageworkloadacrossservers.

    UnderstandingPeopleSoftMasterSchedulerFunctionsAMasterSchedulerenablesloadbalancingofworkloadbyautomaticallyroutingrequeststoavailableProcessSchedulerservers,whichensuresthatyoumaintainoptimalprocessingatalltimes.Thisfeaturealsooffersfaulttoleranceinyourbatchenvironment.Intheeventofaserverfailure,aMasterSchedulercanredistributequeuedrequestsamongtheremainingactiveProcessSchedulerservers.Inaddition,anactiveMasterSchedulermanagesandcontrolsallProcessSchedulerserverdomainsthatareonthesamePeopleSoftdatabase.Itenforcesalloftherulesthatarespecifiedineithertheprocessorjobdefinitions,andmonitorstherunningofallprocesses.ItbecomesthecentralizedcontrolasitcheckstheProcessRequesttablelookingforanyqueuedrequeststorun,andthendispatchesthemtoanappropriateavailableProcessSchedulerserver.

    AMasterSchedulercanbeactivatedinanyoftheProcessSchedulerserversinMicrosoftWindowsandUNIX.ThisoptionisenabledbydefaultwhenyouareconfiguringanewProcessSchedulerserverinWindowsandUNIX.However,thisoptionisnotavailableintheIBMUNIXSystemServices(USS).ForDB2/OS390customerswhointendtostartaProcessSchedulerinUSSandwanttotakeadvantageofthisfeature,aProcessSchedulerserverdomainmustbesetupineitheraMicrosoftWindowsorsupportedUNIXoperatingsystemotherthanUSS.

    DisadvantagesofUsingMultipleProcessSchedulerswithNoMasterScheduler

    WhenaMasterSchedulerisnotused,eachProcessSchedulerserverthatisbroughtupisresponsibleformanagingitsownworkloadbyqueryingtheProcessRequesttable.ThiscanbeproblematicwhenmultipleProcessSchedulerserversarebootedforthesamedatabase.Eachserverattemptstoschedulerequeststhatarespecifiedtoruneitheronthisspecificserveroranyserver.Ifanyrequestissettorunonanyserver,morethanoneservermayattempttoschedulethesamerequest.Toresolvethis,specifyaspecificserverthroughtheProcessRequestpage.However,thisbecomesdisadvantageousifthespecifiedservergoesdownbecausetherequestremainsqueueduntiltheProcessSchedulerserverisbroughtupagain.

    OneotherdisadvantageofbringingupmultipleProcessSchedulerserverswithoutusingaMasterScheduleristheunevenbalanceofworkloadacrossallservers.PeopleSoftProcessSchedulerisconstrainedtohavenewrequestsscheduledwithnoservernametobepickeduponlybyserversthatarerunningintheoperatingsystemthatisspecifiedasthePrimaryOperatingSystemontheSystemSettingspage.Thisdiagramillustratesthisoption:

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    ExampleofMasterSchedulersetupusingthePrimaryOperatingSystemoption

    Inthisspecificsetup,multipleserversarebroughtupinMicrosoftWindows(PSNT1andPSNT2),UNIX(PSUNX),andOS390(PSOS390),whereWindowsisthedesignatedprimaryoperatingsystem.Assumingthatallnewrequestswerescheduledwithablankservername,thenonlyPSNT1andPSNT2arequalifiedtopickuptheserequests.ThePSUNXorPSOS390willbeusedonlywhenrequestsarescheduledwiththenameoftheintendedProcessSchedulerserver.Also,youcanseeascenarioinwhichPSNT1willpickupmostoftherequests,leavingPSNT2underutilized.

    TheMasterSchedulerresolvesthisproblembybecomingthecentralpointforqueryingtheProcessRequesttable.WhenaMasterSchedulerisavailable,allactivePeopleSoftProcessSchedulerServersswitchintoaremoteservermode.MasterSchedulerregistersandmonitorsanyactiveremoteservers.AftertheactiveMasterSchedulerprioritizesallnewqueuedrequests,itchecksallavailableserverstodecidewhichremoteserveristhemostappropriateforrunningaparticularrequestatruntime.Itattemptstoevenlyloadbalanceworkloadacrossallavailableservers,enablingthemosteffectiveuseofoverallcomputingresources.

    CircumstancesinWhichaMasterSchedulerIsRequiredTheMasterSchedulerisanoptionalserverthatenablesyoutodistributeworkloadacrossmultipleProcessSchedulers.However,thistableshowsspecificcircumstancesthatmandatehavinganactiveMasterScheduleravailable:

    Condition Reason

    SchedulePSJobscontainingprocessesthatneedtorunindifferentoperatingsystems.

    ThisinstanceisparticulartodatabaseplatformsthatallowhavingProcessSchedulerserversbootedinmultipleoperatingsystems.WhenthePrimaryOperatingSystemissettoUNIXorOS390,ProcessSchedulerwillattempttoassignallprocesseswithinaPSJobtoProcessSchedulerswiththisoperatingsystem.However,certainprocessescanrunexclusivelyfromWindowsforexample,anyCrystalorPS/nVisionprocesses.MasterSchedulerisrequiredtoredirectthePSJobitemtoPeopleSoftProcessScheduleronWindows.

    ActiveScheduleJobSetsaredefined. OnlyaMasterSchedulercanscheduleanyactiveScheduleJobSets.TheMasterSchedulerisalsoresponsibleforschedulinganyrecurringScheduleJobSets.

    Imposesystemconstraints,asdefinedinprocessorjobdefinitions. AprocessorjobcannowbedefinedwitheitherMutuallyExclusiveProcessesorMaxConcurrentvalues.ThesesystemconstraintswillbeimposedonlyifaMasterSchedulerisactive.

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    TheSystemLoadBalancingOptionissettoAssignToServerInAnyO/S.

    Whenamachinegoesdown,MasterSchedulercantransferqueuedrequeststhatareassignedtothePeopleSoftProcessSchedulerServeronanonfunctioningmachinetoaPeopleSoftProcessSchedulerServerthatisstartedonanothermachine.

    Purgeprocessrequestsandreports. AMasterSchedulermustberunningforthepurgeprocesstorun.

    SeeAlso

    CreatingScheduledJobSetDefinitions

    DefiningJobs

    SettingProcessDefinitionOptions

    HowtoUseMultipleMasterSchedulersEachProcessSchedulerdomainonWindowsorUNIX(exceptforUSS)canbesetuptohaveaMasterSchedulerstarted.However,onlyoneMasterSchedulerisactivetocontroltheworkloadatanytime.TheotherMasterSchedulersremaininastateofidle.IftheactiveMasterSchedulergoesdown,thenoneoftheidleMasterSchedulerserverstakecontrol.IfaMasterSchedulerisnotavailable,thenthePSPRCSRVservers,currentlyinremoveservermode,switchbacktostandalonemodeandquerytheProcessRequesttabletofindwork.

    TheProcessMonitorcomponentidentifiestheProcessSchedulerserverwheretheMasterSchedulerisactive.FromtheServerListtab,wherethelistofactiveProcessSchedulerserversaredisplayed,theMastercolumnindicateswhetheraMasterSchedulerisactiveinanyoftheservers.

    SeeAlso

    ViewingtheServerList

    MasterSchedulerRequestPrioritizationWhenMasterSchedulertalliesallnewqueuedrequests,itattemptstoprioritizeallincomingrequestsbeforecheckingallregisteredactiveserverstofindtheappropriateserver.AsetofruleswereimplementedtohelptheMasterSchedulerprioritizetheaccumulatedqueuedrequeststhatarefoundintheProcessRequesttable.Allrequestsaresortedbasedontheseconditions:

    1. Restartableorrecoveryprocess.

    AnyprocessthatissetintheprocessdefinitionasrestartablewithanonzeroretrycountthatfailedinpreviousattemptsandcurrentlyhasarunstatusofRestartisgivenahigherpriorityandwillbeontopoftheprioritylist.Similarly,aprocessthatisautomaticallyscheduledbyPeopleSoftProcessSchedulerasarecoveryprocessforafailedrequestisalsoplacedontopoftheprioritylist.

    2. ProcessescontainedinactivePSJobs.

    TheMasterSchedulermonitorsallactivePSJobsthathaveprocessesthatarecurrentlyinitiatedinoneormoreProcessScheduler(remote)servers.WhentheMasterSchedulerdetectsthatavailableslotsareavailabletoassignrequeststoaremoteserverandpreparestoevaluateallqueuedrequests,itinitiatesprocesseswithintheseactivePSJobspriortoqueryingtheProcessRequesttablefornewqueuedrequests.

    3. Accumulatedpriorityvalue.

    Eachrequestisgivenanoverallpriorityvaluebasedonthedifferentpriorityoptionsthatareavailableinthesystem.MasterSchedulercalculatestheoverallprioritybasedontheorderofimportanceofthispriority,andrankstherequestaccordingly.However,eachserverdefinitionmaybeconfiguredwithdifferentpriorityoptions,andthereforemayresultinthesamerequestrankinghighinoneserverwhileitispositionedatthebottomofthelistinanother.

    Forexample,anSQRreporthasaprocesscategoryofFinancials.ThiscategoryhasapriorityofHighinthePSNTserverdefinition,whilethesamecategoryhasapriorityofLowinthePSNT2serverdefinition.Inthissituation,theSQRreportwilllikelybeassignedtothePSNTserver.

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    Theoverallprioritywillbecalculatedbasedonthisorderofimportanceofallthesepriorityoptionsthatcanbeassignedtoarequest:

    a. ProcessCategoryPriority:Thesystemwillassignthepriorityvalueoftheprocesscategorythatisspecifiedintheserverdefinitiontotherequest.IfaprocessbelongsinaPSJob,thenallprocessesinthisPSJobwillbeassignedtheprocesscategoryofthePSJob.InthecaseofacomplexPSJobinwhichaPSJobisembeddedwithinanotherPSJob,thenalltheprocesseswillbeassignedtheprocesscategoryofthemainPSJob.

    b. Process/JobPriority:Thisisthepriorityasdefinedineithertheprocessorjobdefinition.Similartotheprocesscategory,allprocesseswithinaPSJobwillhavethepriorityofthemainPSJob.

    c. ProcessTypePriority:Thisistheprioritythatisspecifiedintheserverdefinitionforeachprocesstypeitcanprocess.InthecaseofPSJob,theprocesswithinaPSJobwillhavetheprioritybasedonitsownprocesstype.

    4. Rundateandtime.

    Intheeventoftwoormorerequestshavingthesamecalculatedprioritybasedonallthecriterianotedabove,therequestwithanearlierrundateandtimewillbescheduledfirstbytheMasterScheduler.

    HowtoManageWorkloadAcrossAvailableServersThissectionliststheparametersthatareusedtocontrolhowworkloadismanagedacrossavailableservers:

    Parameter Modified In Options

    PrimaryOperatingSystem SystemSettings Windows(default).UNIX.OS390.

    LoadBalancingOption SystemSettings AssigntoPrimaryO/SOnly(default).AssigntoServerinAnyO/S.

    ServerLoadBalancingOption ServerDefinition UseforLoadBalancing(default).DoNotUseforLoadBalancing.

    RedistributeOption ServerDefinition RedistributetoanyO/S(default).RedistributewithsameO/S.DoNotRedistribute.

    MaxAPIAware ServerDefinition Numericvalue(default=5).

    ProcessCategoryMaxConcurrent ServerDefinition NumericvaluenotexceedingtheMaxAPIAware.

    ProcessTypeMaxConcurrent ServerDefinition NumericvaluenotexceedingtheMaxAPIAware.

    ServerStatus NA NA

    PrimaryOperatingSystemOption

    TheoperatingsystemthatisspecifiedinthePrimaryOperatingSystemfieldintheSystemSettingscomponentisthedefaultoperatingsystemthatisassignedtoallnewqueuedrequestswithablankservernamespecified.Ifthesystemdetectsthattheprocessintherequestcannotberuninthedefaultoperatingsystembasedontheprocesstypedefinition,thenthesystemassignstherequestwiththeoperatingsystemthatisfoundintheprocesstypedefinition.

    LoadBalancingOptions

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    TheLoadBalancingOptionaffectshowMasterSchedulerperformstheroundrobinassignmentforallavailableremoteserversinattemptingtoloadbalancetheworkload.WhentheoptionAssigntoPrimaryO/SOnlyisselected,MasterSchedulerperformsaroundrobinonlytoallremoteserversthatarebootedintheprimaryO/S.

    ThepatternforhowMasterSchedulerassignsrequeststoavailableserverswiththisoptionisillustratedinthisdiagram.

    ExampleofMasterSchedulersetupusingtheLoadBalancingAssigntoPrimaryO/SOnlyoption

    Inthiscase,thePrimaryOperatingSystemisMicrosoftWindows.ThisistheoperatingsysteminwhichbothPSNT1andPSNT2areinitiated.WhenMasterSchedulerfindsnewqueuedrequestswithblankservernames,theworkloadisevenlydistributedbetweenthetwoWindowsProcessSchedulerserversonly.AlthoughPSUNIX1andPSOS390areavailable,norequestsareassignedtotheseservers.TheremoteserversPSUNIX1andPSOS390areassignedonlywithnewrequeststhatarescheduledwiththisspecificservername.

    IftheoptionissettoAssignToServerInAnyO/S,MasterSchedulerattemptstoloadbalanceworkloadtoallactiveservers.Atfirst,ittriestodistributeworktoserversresidingintheprimaryoperatingsystems.Whenithasreachedtheserverdefinitionlimitations,itattemptstorouteworktotheremainingactiveservers.Forexample,MasterSchedulerwillroundrobintheprioritizedliststobothPSNT1andPSNT2,astheseserversarebootedintheprimaryoperatingsystem.AssumingtheMaxAPIAwareforbothPSNT1andPSNT2isthree,thenthefirstsixprocessrequestswillbedistributedbetweenPSNT1andPSNT2,andthereamingrequestswillbedistributedtoPSUNIX1andPSOS390.

    ThepatternforhowMasterSchedulerassignsrequeststoavailableserverswiththisoptionisillustratedinthisdiagram:

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    ExampleofMasterSchedulersetupusingtheLoadBalancingAssignToServerInAnyO/Soption

    ServerLoadBalancingOptions

    TheServerLoadBalancingOptionsfieldoftheserverdefinitionindicateswhethertheservercanbeusedforroutingnewrequestswithblankservernames.SelecttheUseForLoadBalancingoptionifthisservercanbeassignedrequestswithnospecificservernamespecified.Ifthisserverisintendedtobeusedonlyifnewprocessrequestsarescheduledwiththisserversname,setthisserverwiththeDoNotUseForLoadBalancingoption.

    RedistributeOption

    TheRedistributeOptionfieldoftheserverdefinitiondirectstheMasterSchedulertoacourseofactionintheeventthataserverisshutdownorencountersasoftwareorhardwarefailure.IfMasterSchedulerfindsnewqueuedprocessrequestswiththeserversnameidentifieranddetectsthattheserveriscurrentlyunabletoprocessanyrequests,oneofthefollowingthreeoptionscanbeselected:

    RedistributetoanyO/S:MasterSchedulerattemptstoredistributerequestswiththeserversnameintoanyavailableactiveProcessSchedulerserver.

    RedistributewithsameO/S:MasterSchedulerattemptstorerouterequestsonlytoanotherProcessSchedulerthatisbootedinthesameoperatingsystemasthisserver.

    DoNotRedistribute:Masterschedulerdoesnotattempttorerouteanyrequestswiththeserversnameidentifier.Inthiscase,requestsremainqueueduntiltheserverisbootedup.

    MaxAPIAwareandMaxConcurrentOptions

    MasterSchedulerperiodicallymonitorsthecurrentworkloadofallactiveProcessSchedulerservers.Itensuresthatwhenyouareperformingaroundrobinassignment,itdoesnotexceedanyofthefollowinglimitationsthatarespecifiedintheserverdefinition:

    MaxAPIAware:IndicatesthetotalnumberoftasksthataProcessSchedulercaninitiateconcurrently.

    ProcessCategoryMaxConcurrent:Indicatestheupperlimitationofhowmanyprocesseswiththesameprocesscategorycanbeinitiatedconcurrently.

    Note.ThenumberthatisassignedtothisfieldcannotexceedthevaluethatisspecifiedintheMaxAPIAwarefield.

    ProcessTypeMaxConcurrent:SimilartotheProcessCategoryMaxConcurrentfield,thisvalueindicatesthelimitbasedontheprocesstypeoftherequest.

    ServerStatus

    MasterSchedulerroutesworkonlytoProcessSchedulerserverswithaserverstatusofRunning.IfaserverhasastatusofSuspended,Overload,orDown,MasterSchedulerdefersroutingworktotheserveruntilthestatusischangedbacktoRunning.MasterSchedulerevaluatestheappropriateactionforprocessrequeststhatareassignedtotheserverbasedontheRedistributeOptionsetting.

    SeeAlso

    DefiningSystemSettings

    SettingServerDefinitions

    EnterprisePeopleTools8.50PeopleBook:PeopleSoftProcessScheduler

    Copyright1988,2010,Oracleand/oritsaffiliates.Allrightsreserved.


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