AWS Lambda: Difference between revisions

Revision as of 00:47, 22 March 2025

Latest revision as of 00:42, 8 April 2025

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==Features==

In 2019, at the AWS annual cloud computing conference (AWS re:Invent), the AWS Lambda team announced "Provisioned Concurrency", a feature that "keeps functions initialized and hyper-ready to respond in double-digit milliseconds."<ref>{{cite web |date=3 December 2019 |title=New – Provisioned Concurrency for Lambda Functions |url=https://aws.amazon.com/blogs/aws/new-provisioned-concurrency-for-lambda-functions/ |access-date=2020-10-12 |website=aws.amazon.com |archive-date=2020-10-18 |archive-url=https://web.archive.org/web/20201018033719/https://aws.amazon.com/blogs/aws/new-provisioned-concurrency-for-lambda-functions/ |url-status=live }}</ref> The Lambda team described Provisioned Concurrency as "ideal for implementing interactive services, such as web and mobile backends, latency-sensitive [[microservices]], or synchronous APIs."<ref>{{Cite web |date=2019-12-03 |title=New – Provisioned Concurrency for Lambda Functions |url=https://aws.amazon.com/blogs/aws/new-provisioned-concurrency-for-lambda-functions/ |access-date=2020-02-03 |website=Amazon Web Services |language=en-US |archive-date=2020-02-03 |archive-url=https://web.archive.org/web/20200203223548/https://aws.amazon.com/blogs/aws/new-provisioned-concurrency-for-lambda-functions/ |url-status=live }}</ref>

=== Concurrency Models ===

Reserved Concurrency sets a maximum number of concurrent executions for a specific function and reserves that capacity from the account’s overall concurrency limit. However, it does not keep execution environments initialized or guarantee that any instances remain running when the function is idle.<ref>{{Cite web |title=Configuring reserved concurrency for a function - AWS Lambda |url=https://docs.aws.amazon.com/lambda/latest/dg/configuration-concurrency.html |access-date=2025-04-08 |website=docs.aws.amazon.com}}</ref>

Provisioned Concurrency, in contrast, maintains a specified number of pre-initialized execution environments, ensuring that the function does not experience cold starts and does not scale down to zero.<ref>{{Cite web |title=Configuring provisioned concurrency for a function - AWS Lambda |url=https://docs.aws.amazon.com/lambda/latest/dg/provisioned-concurrency.html |access-date=2025-04-08 |website=docs.aws.amazon.com}}</ref>

=== Lambda Function URL ===

The Lambda Function URL gives Lambda a unique and permanent [[URL]] which can be accessed by [[authenticated]] and non-authenticated users alike.<ref name=":0">{{Cite web |title=Lambda function URLs - AWS Lambda |url=https://docs.aws.amazon.com/lambda/latest/dg/lambda-urls.html |access-date=2024-03-01 |website=docs.aws.amazon.com |archive-date=2024-03-01 |archive-url=https://web.archive.org/web/20240301105416/https://docs.aws.amazon.com/lambda/latest/dg/lambda-urls.html |url-status=live }}</ref>