Provisioned Concurrency is a feature in AWS Lambda that helps in reducing function invocation latency and ensures consistent performance of your Lambda function when it is required to handle frequent, spiky workloads. It pre-initializes a specific number of execution environments or instances, whic…Provisioned Concurrency is a feature in AWS Lambda that helps in reducing function invocation latency and ensures consistent performance of your Lambda function when it is required to handle frequent, spiky workloads. It pre-initializes a specific number of execution environments or instances, which are ready to respond immediately to your function requests. You can also configure auto-scaling for your provisioned concurrency to adjust the number of instances based on the demand. This helps in reducing the cold start latency, as a pre-warmed execution environment is readily available to handle invocations.
Guide to AWS Lambda: Provisioned Concurrency
Provisioned Concurrency in AWS Lambda is a feature that helps applications to have consistent start-up times, and handle variable workloads efficiently.
It's importance lies in its ability to reserve a set instance for a Lambda function. This eliminates the latency from a 'cold start' that can occur when a function is invoked after not being used for a time period. It allows your serverless applications to respond rapidly and consistently to events, equating to better user experiences.
What is it: In simple words, Provisioned Concurrency is a setting for your Lambda functions where you tell AWS how many function instances you want to remain warm, ready to respond to invocations at a moment's notice.
How it works: Instead of AWS pausing your function's instances during idle times (cold start), instances are left running. You allocate and pay for these 'warm instances' to allow for immediate responsiveness when called upon. AWS manages the warm instances automatically based on your allocated provisioned concurrency.
When it comes to exam questions on Provisioned Concurrency, here are some tips: 1. Understand how Provisioned Concurrency differs from On-Demand Concurrency (standard case). On-Demand allows for auto-scaling, but can have slow start-up times due to 'cold starts'. Provisioned Concurrency prevents 'cold starts' but needs to be managed and paid for 2. Be aware of how this feature can impact your AWS costs – you are billed for the amount of provisioned concurrency and the duration for which it has been provisioned 3. AWS often asks questions about optimizing costs vs performance in cloud systems architecture- consider, when would maintaining readiness of your function offset the costs?
Always remember, in the exam, focus on benefits and drawbacks of Provisioned Concurrency to decide the best use case scenarios. Application characteristics like predictable peak usage times, and need for low latency can signal its use.
AWS Certified Solutions Architect - Provisioned Concurrency Example Questions
Test your knowledge of Provisioned Concurrency
Question 1
A retail website uses AWS Lambda to process user data. During peak hours they experience decreased performance due to cold starts. What setting should they configure to address this issue?
Question 2
A company experiences increased latency in its AWS Lambda functions at the beginning of the day when employees access the internal dashboard. What would best address this issue?
Question 3
A startup company has a social media application and uses a Lambda function to process new user profile images. When they launch marketing campaigns, they receive a large volume of sign-ups. Which method should they choose to minimize the cold-start issue?
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