On a flight from Zurich to Toronto, I found myself in an engaging conversation with a fellow passenger. Among various topics, our conversation navigated toward our careers and, inevitably, as I am a Java developer, towards the world of Java. This gentleman, having worked with Java some 15-20 years ago, was surprised to learn that I still actively use the …

Sticky sessions, also known as session affinity, is a mechanism by which a routing component that acts as a facade always routes a request to the same underlying upstream node. In this article, I’ll describe the reason behind sticky sessions, available alternatives, and how to implement them via Apache APISIX. Why sticky sessions? Sticky sessions became popular when we stored …

We’ve described the concept behind sticky sessions: you forward a request to the same upstream because there’s context data associated with the session on that node. However, if necessary, you should replicate the data to other upstreams because this one might go down. In this post, we are going to illustrate it with a demo. The overall design Design options …