CODEWITHSUNDEEP
amazon-web-servicesaws-lambda
SangminKim
SangminKim

Reputation: 9136

Does AWS lambda guarantee no downtime when updating function to a new version?

By default, AWS uses the LATEST alias for the latest lambda version updated and I assume the below step.

  1. Now, LATEST alias points version 5.
  2. User deploys the new version of the lambda.
  3. While deploying the new version, LATEST alias still points version 5.
  4. When the deploying is complete, Lambda just switches LATEST alias to version 6.

Through the steps, lambda seems to have almost 0 downtime.

However, It is just an assumption.

Is there any document explicitly mentioning about the downtime while deploying the new version? I just want to know how much AWS guarantee downtime while deploying the new version.

I also found similar question here, however not clear for my question.

Upvotes: 9

Views: 5810

Answers (1)

rickjerrity
rickjerrity

Reputation: 814

AWS Lambda uses containers for deployment. If I had to guess, AWS is spinning up Version 6 while Version 5 is still active, then once Version 6 is ready, it applies whatever changes necessary to point traffic to the now live Version 6. The below article mentions somewhat the AWS Lambda container lifecycle:

https://aws.amazon.com/blogs/compute/container-reuse-in-lambda/

Upvotes: 4

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