Fan-In/Fan-Out Orchestration
Learn how to implement fan-in and fan-out orchestration with a durable function.
We'll cover the following...
There are scenarios where we want multiple activities to run in parallel or as close to the parallel. There are also times when the results of multiple jobs need to be aggregated and processed as one unit. These are situations where either fan-out or fan-in orchestration can be applied.
In this lesson, we will cover the fundamentals of both these architecture types. We will do so with the help of the following interactive playground. In this project, we execute a large number of activity function calls in parallel.
## Ignore Visual Studio temporary files, build results, and ## files generated by popular Visual Studio add-ons. # Azure Functions localsettings file local.settings.json # User-specific files *.suo *.user *.userosscache *.sln.docstates # User-specific files (MonoDevelop/Xamarin Studio) *.userprefs # Build results [Dd]ebug/ [Dd]ebugPublic/ [Rr]elease/ [Rr]eleases/ x64/ x86/ bld/ [Bb]in/ [Oo]bj/ [Ll]og/ # Visual Studio 2015 cache/options directory .vs/ # Uncomment if you have tasks that create the project's static files in wwwroot #wwwroot/ # MSTest test Results [Tt]est[Rr]esult*/ [Bb]uild[Ll]og.* # NUNIT *.VisualState.xml TestResult.xml # Build Results of an ATL Project [Dd]ebugPS/ [Rr]eleasePS/ dlldata.c # DNX project.lock.json project.fragment.lock.json artifacts/ *_i.c *_p.c *_i.h *.ilk *.meta *.obj *.pch *.pdb *.pgc *.pgd *.rsp *.sbr *.tlb *.tli *.tlh *.tmp *.tmp_proj *.log *.vspscc *.vssscc .builds *.pidb *.svclog *.scc # Chutzpah Test files _Chutzpah* # Visual C++ cache files ipch/ *.aps *.ncb *.opendb *.opensdf *.sdf *.cachefile *.VC.db *.VC.VC.opendb # Visual Studio profiler *.psess *.vsp *.vspx *.sap # TFS 2012 Local Workspace $tf/ # Guidance Automation Toolkit *.gpState # ReSharper is a .NET coding add-in _ReSharper*/ *.[Rr]e[Ss]harper *.DotSettings.user # JustCode is a .NET coding add-in .JustCode # TeamCity is a build add-in _TeamCity* # DotCover is a Code Coverage Tool *.dotCover # NCrunch _NCrunch_* .*crunch*.local.xml nCrunchTemp_* # MightyMoose *.mm.* AutoTest.Net/ # Web workbench (sass) .sass-cache/ # Installshield output folder [Ee]xpress/ # DocProject is a documentation generator add-in DocProject/buildhelp/ DocProject/Help/*.HxT DocProject/Help/*.HxC DocProject/Help/*.hhc DocProject/Help/*.hhk DocProject/Help/*.hhp DocProject/Help/Html2 DocProject/Help/html # Click-Once directory publish/ # Publish Web Output *.[Pp]ublish.xml *.azurePubxml # TODO: Comment the next line if you want to checkin your web deploy settings # but database connection strings (with potential passwords) will be unencrypted #*.pubxml *.publishproj # Microsoft Azure Web App publish settings. Comment the next line if you want to # checkin your Azure Web App publish settings, but sensitive information contained # in these scripts will be unencrypted PublishScripts/ # NuGet Packages *.nupkg # The packages folder can be ignored because of Package Restore **/packages/* # except build/, which is used as an MSBuild target. !**/packages/build/ # Uncomment if necessary however generally it will be regenerated when needed #!**/packages/repositories.config # NuGet v3's project.json files produces more ignoreable files *.nuget.props *.nuget.targets # Microsoft Azure Build Output csx/ *.build.csdef # Microsoft Azure Emulator ecf/ rcf/ # Windows Store app package directories and files AppPackages/ BundleArtifacts/ Package.StoreAssociation.xml _pkginfo.txt # Visual Studio cache files # files ending in .cache can be ignored *.[Cc]ache # but keep track of directories ending in .cache !*.[Cc]ache/ # Others ClientBin/ ~$* *~ *.dbmdl *.dbproj.schemaview *.jfm *.pfx *.publishsettings node_modules/ orleans.codegen.cs # Since there are multiple workflows, uncomment next line to ignore bower_components # (https://github.com/github/gitignore/pull/1529#issuecomment-104372622) #bower_components/ # RIA/Silverlight projects Generated_Code/ # Backup & report files from converting an old project file # to a newer Visual Studio version. Backup files are not needed, # because we have git ;-) _UpgradeReport_Files/ Backup*/ UpgradeLog*.XML UpgradeLog*.htm # SQL Server files *.mdf *.ldf # Business Intelligence projects *.rdl.data *.bim.layout *.bim_*.settings # Microsoft Fakes FakesAssemblies/ # GhostDoc plugin setting file *.GhostDoc.xml # Node.js Tools for Visual Studio .ntvs_analysis.dat # Visual Studio 6 build log *.plg # Visual Studio 6 workspace options file *.opt # Visual Studio LightSwitch build output **/*.HTMLClient/GeneratedArtifacts **/*.DesktopClient/GeneratedArtifacts **/*.DesktopClient/ModelManifest.xml **/*.Server/GeneratedArtifacts **/*.Server/ModelManifest.xml _Pvt_Extensions # Paket dependency manager .paket/paket.exe paket-files/ # FAKE - F# Make .fake/ # JetBrains Rider .idea/ *.sln.iml # CodeRush .cr/ # Python Tools for Visual Studio (PTVS) __pycache__/ *.pyc
Durable function with a fan-out orchestration
Fan-in and fan-out basics
The following diagram ...