Large Payload Samples (dotnet)

[YunchuWang]

Purpose

• Add Large Payload samples for .NET Durable Functions with Durable Task Scheduler
• Demonstrate how to use the large payload storage feature to handle payloads that exceed the Durable Task Scheduler's message size limit
• When enabled, payloads larger than the configured threshold are automatically offloaded to Azure Blob Storage (compressed via gzip), keeping orchestration history lean while supporting arbitrarily large data
• Both samples use a fan-out/fan-in pattern: the orchestrator fans out to multiple activity functions, each generating a configurable-size large payload, then aggregates the results

Does this introduce a breaking change?

[ ] Yes
[x] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

How to Test

• Get the code

git clone https://github.com/Azure-Samples/Durable-Task-Scheduler.git
cd Durable-Task-Scheduler
git checkout wangbill/lpsamples

• Test the .NET sample

cd samples/durable-functions/dotnet/LargePayload
dotnet build
# Configure local.settings.json with Durable Task Scheduler connection info
func start
# Trigger the orchestration via HTTP: POST http://localhost:7071/api/StartLargePayload

• Test the Python sample

cd samples/durable-functions/python/large-payload
pip install -r requirements.txt
# Configure local.settings.json with Durable Task Scheduler connection info
func start
# Trigger the orchestration via HTTP: POST http://localhost:7071/api/startlargepayload

What to Check

Verify that the following are valid

• .NET LargePayload sample builds successfully (dotnet build)
• Both samples include proper README documentation with setup and deployment instructions
• host.json files are correctly configured with large message settings (compression, blob storage threshold)
• Fan-out/fan-in orchestration logic is correct in both .NET and Python implementations
• Payload size and activity count are configurable via environment variables (PAYLOAD_SIZE_KB, ACTIVITY_COUNT)

Other Information

• New files added:
  • samples/durable-functions/dotnet/LargePayload/ — .NET 8 isolated worker sample (LargePayloadOrchestration.cs, Program.cs, host.json, .csproj, README.md, .gitignore)

[halspang]

The java .class file seems like an accidental inclusion.

[YunchuWang]

updated! @halspang i will keep this pr for dotnet sample only, since the large pyayload not in extension bundle yet. will have a separate pr for all non dotnet sdks after next bundle version is released.