We run a set of NestJS microservices that talk to each other over Azure Service Bus queues. For a while, our error handling assumption was simple and wrong: "if the consumer throws, the message just gets redelivered." What really happened, a transient downstream failure would silently drop a message. Queue Message Drops Table of Contents The failure mode Azure Service Bus will redeliver a message if your handler throws and you don’t complete it but only up to maxDeliveryCount

Caching is one of the most common techniques used to make applications faster. Instead of fetching the same data from a database or API every time a user requests it, an application can temporarily store that data in a cache. The next request can then be served much faster. But this raises an important question: If the original data changes, how does the cache know that its copy is no longer correct? The short answer is: a cache usually does not magically know. The applicatio