David Paul McQuiggin

May 1, 2018

Any suggestions for implementing CQRS with Event Sourcing on current Azure feature set? Examples / references? ('CQRS Journey' is a little dated w.r.t newly available Event Grid, etc).

Cecil Phillip

.NET Software Developer, Podcaster, Educator & Mentor

May 1, 2018

In the .NET/Azure space you have a few options for implementing the CQRS pattern.

Specifically for Azure, I'd suggest taking a look at our Event Hub service https://docs.microsoft.com/en-us/azure/event-hubs/. This is somewhat similar to Kafka plus it's a hosted Azure service. It alows you to do capture, retention, and replay of event stream data.

It also supports AMQP 1.0, which means any AMQP 1.0 compliant library or client can leverage the service.

Jeremy Likness

We have several documents that discuss the pattern and sample implementations.

docs.microsoft.com/azure/architecture/patterns/cq… (CQRS)

docs.microsoft.com/azure/architecture/patterns/ev… (Event Sourcing)

docs.microsoft.com/azure/architecture/guide/archi… (Architecture Style)

docs.microsoft.com/dotnet/standard/microservices-… (Microservices)

This is also a personal favorite article that talks about its implementation serverless with Azure Cosmos DB: medium.com/@richard.j.gobbett/serverless-cqrs-in-…

Hope those help you get started!

David Paul McQuiggin

May 1, 2018

Excellent, thanks...

I have a prototype with Event Hubs for accepting Commands, Functions (one per Command) that apply the Commands to an Aggregate Root, then Events routed via Event Grid to Functions - one per Aggregate type, that processes any and all Events that might be raised by that specific Aggregate type.

At the moment, one Function per Aggregate type is the only way I can think of to work around cold starts leading to Functions per Event type processing Events out of order for Projections etc.

Lots of reading to do - cheers!

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