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Messaging

Avoiding a QUEUE Backlog Disaster with Backpressure & Flow Control

I advocate a lot for asynchronous messaging. It can add reliability, temporal decoupling, and much more. But what are some of the challenges? One of them is backpressure and flow control. This occurs when you’re producing more messages can you can consume. Meaning you’re piling up messages in your queue and you can never catch up. The queue just keeps growing. YouTube Check out my YouTube channel where I post all kinds of content that accompanies my posts including this video showing everything in this post. Producers and Consumers Producers send messages to a broker/queue and a Consumer processes those messages. For… Read More »Avoiding a QUEUE Backlog Disaster with Backpressure & Flow Control

Message Ordering in Pub/Sub or Queues

Do you need message ordering? Processing messages in order as they were sent/published to a queue or topic sounds simple but has some implications. What happens when processing a message fails? What happens to all subsequent messages? How is throughput handled when using the competing consumers’ pattern, which loses the guarantee processing in order. Lastly, is ordering even important? YouTube Check out my YouTube channel where I post all kinds of content that accompanies my posts including this video showing everything in this post. Message Ordering What are some reasons that most people think they need to process messages in a particular… Read More »Message Ordering in Pub/Sub or Queues

Commands & Events: What’s the difference?

One of the building blocks of messaging is, you guessed it, messages! But there are different kinds of messages: Commands and Events. So what’s the difference? Well, they have very distinct purposes, usage, naming, ownership, and more! YouTube Check out my YouTube channel where I post all kinds of content that accompanies my posts including this video showing everything in this post. Commands The purpose of commands is the intent to invoke behavior. When you want something to happen within your system, you send a command. There is some type of capability your service provides and you need a way to expose… Read More »Commands & Events: What’s the difference?