I am dipping my feet into event sourcing pattern and trying to make sense of aggregates.I have read a few blogs and now I am more confused than ever before. From what I inferred aggregates should ...

In the current plan, incoming commands are handled via Function Apps, resulting in Events being sent to an Event Hub, and then materializing the views Someone is arguing that instead of storing ev...

I'm looking for an advice related to the proper way of implementing a rollback feature in a CQRS/event-sourcing application. This application allows to a group of editors to edit and update some ed...

Given service A (CMS) that controls a model (Product, let's assume the only fields that it has are id, title, price) and services B (Shipping) and C (Emails) that have to display given model what s...

In CQRS / ES based systems, you store events in an event-store. These events refer to an aggregate, and they have an order with respect to the aggregate they belong to. Furthermore, aggregates are ...

In typical DDD architecture we have 3 layers: Domain - no references Application - it has reference to Domain layer Infrastructure - it has reference to Domain layer (+ Web / UI project) Domain mod...

What is event driven design and Domain driven design? What are the specific benefits using of Domain driven design, event driven design in MicroServices.

I am making an application which will need to use NestJS' CQRS module, as the requirements naturally lend themselves to that pattern. Updates to the application logic are expected to be frequent a...

Besides missing some of the benefits of Event Sourcing, are there any other drawbacks to adapting an existing architecture to CQRS without the Event Sourcing piece? I'm working on large applicatio...

If I were using an RDBMS (e.g. SQL Server) to store event sourcing data, what might the schema look like? I've seen a few variations talked about in an abstract sense, but nothing concrete. For exa...

I'm looking into the possibility of adopting the concept of (root) aggregates from domain-driven design in a system without an event store. However, the more I discover about the two, the more it f...

This is a follow-up question to my issue outlined here. The Gateway serves as an entry point to the application, to which every request from the client is made. The gateway then allocates the requ...

I was wondering which of my two methods is more appropriate, or is there event another one? (1) Direct Direct communication between GATEWAY and μSERVICE A UI sends HTTP request to GATEWAY GATE...

EventSourcing works perfectly when we have particular unique EntityID but when I am trying to get information from eventStore other than particular EntityId i am having tough time. I am using CQRS...

I'm researching about CQRS pattern and our team wants to develop a system based on CQRS in PHP. I know we can simulate event system in PHP, but I found that CQRS implements better/easier if the p...

Event sourcing and CQRS is great because it gets rids developers being stuck with one pre-modelled database which the developer has to work with for the lifetime of the application unless there is ...

I am having trouble getting my head around how I would support timeseries/temporal data in DDD and how it would be handled on the write side using CQRS. Ultimately I would like to find a solution t...

I'm designing an Event Store on AWS and I chose DynamoDB because it seemed the best option. My design seems to be quite good, but I'm facing some issues that I can't solve. **The design Events ar...

Let's take a simple "Account Registration" example, here is the flow: User visit the website Click the "Register" button and fill out the form, click the "Save" butto...

Since a couple of days I've been trying to figure it out how to inform to the rest of the microservices that a new entity was created in a microservice A that store that entity in a MongoDB. I wan...

I want to setup a small event sourcing lib. I read a few tutorials online, everything understood so far. The only problem is, in these different tutorials, there are two different database strateg...

I'm new to Mass Transit and I would like to understand if it can helps with my scenario. I'm building a sample application implemented with a CQRS event sourcing architecture and I need a service b...

I am building Microservices. One of my MicroService is using CQRS and Event sourcing. Integration events are raised in the system and i am saving my aggregates in event store also updating my read ...

I'm implementing a project using CQRS and Event Sourcing. I realized that my commands and my events are nearly always the same. Let's say I have a command CreatePost : public class CreatePost imp...

Greg Young, author of Event Store, defined a while ago the correlation ID to reference the root cause and the causation ID to reference the direct cause of a message. Therefore you should be able ...