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AWS Lambda (sdk) LayerVersionNotFoundException

The specified layer version does not exist.

Understanding AWS Lambda

AWS Lambda is a serverless compute service that allows you to run code without provisioning or managing servers. It automatically scales your applications by running code in response to triggers such as changes in data, shifts in system state, or user actions. Lambda layers are a way to manage common code and data across multiple functions, enabling you to keep your deployment package small and focused on your business logic.

Identifying the Symptom: LayerVersionNotFoundException

When working with AWS Lambda, you might encounter the LayerVersionNotFoundException. This error typically occurs when you attempt to use a Lambda layer version that does not exist. The error message will indicate that the specified layer version cannot be found, which can halt your deployment or execution process.

Exploring the Issue: What Causes LayerVersionNotFoundException?

The LayerVersionNotFoundException is triggered when the AWS Lambda service cannot locate the specified layer version. This can happen due to several reasons:

  • The layer version number is incorrect or does not exist.
  • The layer is not available in the specified AWS region.
  • There might be a typo or misconfiguration in your deployment script or configuration file.

Common Scenarios Leading to the Error

Developers often encounter this error when they have recently updated their Lambda function configuration or are deploying to a new region without ensuring the layer is available there. Another common scenario is when the layer version is deleted or not yet published.

Steps to Resolve LayerVersionNotFoundException

To resolve the LayerVersionNotFoundException, follow these steps:

Step 1: Verify Layer Version

Ensure that the layer version you are referencing exists. You can list available layer versions using the AWS CLI:

aws lambda list-layer-versions --layer-name --region

Replace <your-layer-name> and <your-region> with your actual layer name and AWS region.

Step 2: Check AWS Region

Ensure that the layer version is available in the region where your Lambda function is deployed. Layers are region-specific, and you need to deploy them in each region where they are used.

Step 3: Update Deployment Scripts

Review your deployment scripts or configuration files to ensure there are no typos or incorrect references to the layer version. Make sure the version number is correct and matches the one listed in your AWS account.

Step 4: Re-deploy the Layer

If the layer version was accidentally deleted or not published, you may need to re-deploy it. Follow the AWS documentation on creating and managing Lambda layers to publish a new version.

Conclusion

By following these steps, you should be able to resolve the LayerVersionNotFoundException and ensure your AWS Lambda functions are using the correct layer versions. For more detailed information, refer to the AWS Lambda Layers documentation.

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