Hands-On Azure for Developers

Scaling Azure Functions

In Azure Functions, there is no possibility to scale up, at least for the consumption plan. Of course, when using the App Service Plan, you can scale it up and get better hardware, but it does not affect the service itself. Instead it creates more resources to consume. On the other hand, you cannot scale out manually. The only possibility is to let Azure Functions scale automatically. To do so, this service implements the concept of a scale controller. This is an internal feature that constantly monitors how particular workers hosting the Function's runtime behave, and if one of them seems to be overloaded, another machine is added to the set.

Azure Functions scaling behavior is quite sophisticated and only partially ...