Function (lambda): allow users in regions where 10GB memory is supported to utilize them

[xkjjx]

Describe the feature

Currently, the following code:

    const lambdaFunction = new DockerImageFunction(this, 'functionName', {
      code: DockerImageCode.fromImageAsset('path',{
        cacheDisabled: true,
        platform: Platform.LINUX_AMD64
      }),
      memorySize: 10240,
      timeout: Duration.seconds(30)
    });

fails with this error:

<Stack> | 4:44:43 PM | UPDATE_FAILED        | AWS::Lambda::Function       | <lambdaFunction> (<lambdaFunction>347AB729) Resource handler returned message: "'MemorySize' value failed to satisfy constraint: Member must have value less than or equal to 3008 (Service: Lambda, Status Code: 400, Request ID: c0721ca7-8785-4819-b77e-b6723db102fa)" (RequestToken: 948af33e-1563-d249-f5f0-eea3c7397d56, HandlerErrorCode: InvalidRequest)
❌  <Stack> failed: Error: The stack named <Stack> failed to deploy: UPDATE_ROLLBACK_COMPLETE: Resource handler returned message: "'MemorySize' value failed to satisfy constraint: Member must have value less than or equal to 3008 (Service: Lambda, Status Code: 400, Request ID: c0721ca7-8785-4819-b77e-b6723db102fa)" (RequestToken: 948af33e-1563-d249-f5f0-eea3c7397d56, HandlerErrorCode: InvalidRequest)

However, according to THIS article, memory limits of up to 10GB is supported in many regions.

Thus, if I am deploying into a region with support for the increased memory limit, I should be able to do so successfully - if I am in an unsupported region, I should be given a more descriptive error message.

Use Case

I need higher memory limits for my Lambda function and I would like to use them while maintaining the seamless deployment of AWS CDK.

Proposed Solution

No response

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

CDK version used

2.173.2

Environment details (OS name and version, etc.)

Ubuntu 24 on AWS Lightsail

[pahud]

Looks like this error is coming from CloudFormation, not CDK?

[xkjjx]

Looks like this error is coming from CloudFormation, not CDK?

I think you're right - looking into the code for CDK, there seems to be no bound check for memory size. Thanks.

[xkjjx]

From what I understand CloudFormation is not open source like CDK right?

[xkjjx]

Further information - while technically the region I was using has a limit of 10240MB (AWS always uses this figure as the upper bound on their informational websites, if you actually try setting it to numbers above 3008 even through the website there is an error. Unofficially, it looks like you have to get support to write you a ticket to increase it manually.

After I get it increased I will update this thread based on if I can access the higher limits through CDK.

[xkjjx]

After I got my limit approved, I was able to set it to the higher value in CDK without issues.

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