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Derek Comartin

Scaling a Monolith Horizontally

How do you scale a monolith? Scale-up? Scale-out? A monolith doesn’t need to be a big ball of mud! Monoliths with well-defined boundaries that are loosely coupled, you have a lot of options for scaling. With well-defined boundaries, you can scale out each boundary independently, including the database. Boundaries within a system are so important, regardless of Monolith or (micro)Services, and give you more options for scaling. YouTube Check out my YouTube channel where I post all kinds of content that accompanies my posts including this video showing everything that is in this post. Solution Structure For a refresher, here’s… Read More »Scaling a Monolith Horizontally

Event Choreography & Orchestration (Sagas)

How do you handle business processes and workflows in an asynchronous event-driven architecture? You can use event choreography and orchestration with compensating actions to overcome the lack of distributed transactions or two-phase commits in a distributed system. Here’s how Event Choreography & Orchestration work and examples using NServiceBus. YouTube Check out my YouTube channel where I post all kinds of content that accompanies my posts including this video showing everything that is in this post. Saga Event Choreography Choreography is driven by events from the various services within a system. Each service consumes events, performs an action, and publishes events.… Read More »Event Choreography & Orchestration (Sagas)

Handling Duplicate Messages (Idempotent Consumers)

“At Least Once” message guarantees that a message will be delivered to a consumer once or many times. This means that you need to develop your consumers to be able to effectively handle duplicate messages. The term for this is having idempotent consumers. Not doing so could result in some bad outcomes for your system. For example, processing a message twice that creates an order, could create two orders. That would not likely be a good outcome. Why do messages get delivered more than once? How do you handle duplicates? Here’s how to make idempotent consumers and be resilient to… Read More »Handling Duplicate Messages (Idempotent Consumers)