Azure Functions still “Cold Start” in Consumption plan when keep alive request sent per 4 mins

Question

I already read Understanding Serverless Cold Start | Azure App Service Team Blog article. One the the comments said You can avoid cold start in consumption plan also by calling function from Azure Logic app in every 4 mins interval.

I was trying to make 1 request per 4 minutes to one function of my app but this doesn’t always works. It sometimes still cold start. I know it's a hack. Is there any better way to ensure App always running when using Consumption plan?

Answer 1

I tried to answer this question in my article Cold Starts Beyond First Request in Azure Functions.

In short, there doesn't seem to be a way to avoid cold starts completely. Keep alive calls will make the life span of a given instance longer, but it won't make it indefinitely long.

For now, Cold Starts seem to be a genuine issues of FaaS implementations, they get optimized over time, but probably you won't be able to reduce them to 0.