Event Store on Azure

[Fabian Schmied]

Hi,

I'm currently researching ways of storing events for an Azure Platform application and am having difficulties finding a production-grade event store. By production-grade, I mean one that has the necessary features for reliable read model updates (i.e., either catch-up subscriptions or a global event sequence that can be queried by an asynchronous catch-up process).

I've already found StreamStone (https://github.com/yevhen/Streamstone) and AtomEventStore (https://github.com/GreanTech/AtomEventStore), both of which at first glance appear not to have production-grade support for read models?
Of NEventStore, I know that the MSSQL Persistence is not really compatible with Azure SQL under high load out of the box (https://github.com/NEventStore/NEventStore.Persistence.SQL/issues/14).

As an alternative, I've also found info about hosting Greg's EventStore in an Azure VM (e.g., http://www.bluey.com/2016/02/14/event-store-on-azure-vm-quick-start-guide/). I guess, this should work alright, but I'd still like to know if there is a good way to store events using the Azure storage mechanisms rather than a VM.

So, is anyone here hosting an event-sourced application on Azure? Is so, what are you using? What are your experiences?

Best regards,
Fabian

[Jairo Alfaro]

Hi, I am researching the same topic. What did you do at the end?

[RealDieselMeister]

Why not Greg ES in a Docker-Container hosted on Azure or there is an Article about ES in Server Fabric Cluster.

[Fabian Schmied]

@Jairo: At the moment, we're still using a VM with SQL Server with NEventStore.
@Daniel: I'm still interested in people's experiences with Azure-based event sourcing solutions in production. Are you actually running Greg's ES in Azure? Is there any guidance on how to set this up regarding disks and backups?

[Johan 't Hart]

Hi Fabian / Jairo

We are also researching the same topic... Is there any follow-up on this?

I've seen/read somewhere there's a hosted Kafka on Azure. Does someone have experience with that?

[Fabian Schmied]

We've decided to stay with NEventStore for the moment and migrate to Azure SQL (requires a slight change to the MsSqlDialect - https://github.com/NEventStore/NEventStore.Persistence.SQL/issues/14#issuecomment-381404902). I'm still very much interested in people's experiences with Azure-based event stores, though :)

Regarding Kafka: There's this old thread detailing why Kafka is not a good event store for the kind of event-sourced systems usually discussed on this group: https://groups.google.com/forum/#!topic/dddcqrs/rm02iCfffUY. This newer article comes to the same conclusion, giving more detailed reasons: https://medium.com/serialized-io/apache-kafka-is-not-for-event-sourcing-81735c3cf5c.

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[Brad F]

Why not use VMs? How would docker work with persistent storage. What happens when the container gets restarted?

[Johan 't Hart]

On Azure the pricing is:
VM's > containers > managed services

I'm considering running Event Store in docker and attach a volume to it, all via kubernetes (AKS) or something... Not sure how that would work out...
Maybe NEventStore is the best option for Azure for now indeed...