Function scaling behavior in Azure - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is function scaling behavior in Azure Functions?

It is how Azure Functions automatically adjust the number of running instances based on the workload to handle more or fewer requests efficiently.

beginner

What triggers Azure Functions to scale out (add more instances)?

When the number of incoming events or requests increases beyond the current processing capacity, Azure Functions adds more instances to handle the load.

beginner

How does Azure Functions scale in (reduce instances)?

When the workload decreases and fewer requests come in, Azure Functions automatically reduces the number of instances to save resources and cost.

intermediate

What is the difference between Consumption Plan and Premium Plan in Azure Functions scaling?

Consumption Plan scales automatically and charges per execution, while Premium Plan provides pre-warmed instances for faster start and can scale based on demand with more control.

intermediate

Why is cold start important in function scaling behavior?

Cold start happens when a new instance starts to handle requests, causing a slight delay. Minimizing cold starts improves performance during scaling out.

What causes Azure Functions to add more instances?

A Increase in incoming requests

B Decrease in incoming requests

C Manual user action only

D Fixed schedule

Azure Functions scale out automatically when incoming requests increase to handle the load.

Which Azure Functions plan charges based on the number of executions?

A Dedicated Plan

B Consumption Plan

C Premium Plan

D App Service Plan

Consumption Plan charges based on executions and scales automatically.

What is a cold start in Azure Functions?

A Function timeout error

B Function running out of memory

C Manual restart of function

D Delay when a new instance starts

Cold start is the delay caused by starting a new instance to handle requests.

How does Azure Functions scale in?

A By adding more instances

B By increasing CPU power

C By reducing instances when workload decreases

D By changing code automatically

Azure Functions reduce the number of instances when the workload decreases to save resources.

Which plan offers pre-warmed instances to reduce cold start delays?

A Premium Plan

B Basic Plan

C Free Plan

D Consumption Plan

Premium Plan provides pre-warmed instances to reduce cold start delays.

Explain how Azure Functions automatically adjust their instances based on workload.

Think about how a restaurant adds or removes staff depending on how busy it is.

Describe the difference between Consumption Plan and Premium Plan in Azure Functions scaling.

Compare a pay-as-you-go taxi versus a reserved car service.