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How to understand the cold start in AWS Lambda? I believe many inexperienced people don't know what to do about it. Therefore, this paper summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem.

What is a cold start?

A cold start is the delay encountered when triggering a function.

A cold start occurs only when there is no idle container waiting to run the code. None of this is visible to the user, and AWS has complete control over when to terminate the container.

What is the effect of cold start?

Frustrated users due to slow response

Pay more for speed (sometimes)

If you don't think about it carefully, there will be a timeout-chain reaction in the calling function.

Care about operational issues that have nothing to do with you

When should we pay attention to cold start?

If you are using statically typed languages such as Java and C #

If you have a customer-oriented / synchronization application

If your requests are small or sparse,

After the new version is deployed (all containers are destroyed)

Changes in the configuration (environment variables, security groups, memory limits, etc.), the new container must be started with the new configuration

What factors will increase the cold start time?

Language choice

Memory size

Code size

VPC

HTTPS call

Things that need classpath scanning (Java)

Is there any solution to this problem?

First of all, accept that you can't guarantee that you won't suffer from a cold start. The final solution must come from a cloud provider. We can only try to improve.

If this is not a big problem, then do nothing (advice)

Wait for AWS to improve it (for example, AWS provides preset concurrency, improvements have been made to VPC networks, etc.)

Use dynamic programming languages (such as Python, NodeJS, or PHP) rather than statically typed programming languages (e.g. C++, C#, or Java)

Use HTTP instead of HTTPS

Increase memory (and pay more)

Do some warm-up (before AWS provides preset concurrency, you can try to trigger the function regularly to keep the function instance hot)

After reading the above, have you mastered how to understand the cold start in AWS Lambda? If you want to learn more skills or want to know more about it, you are welcome to follow the industry information channel, thank you for reading!

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