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AWS Lambda (sdk) ProvisionedConcurrencyConfigNotFoundException

The specified provisioned concurrency configuration does not exist.

Understanding AWS Lambda and Its Purpose

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. AWS Lambda is designed to simplify the process of building highly scalable applications by abstracting the infrastructure management.

Identifying the Symptom: ProvisionedConcurrencyConfigNotFoundException

When working with AWS Lambda, you might encounter the error ProvisionedConcurrencyConfigNotFoundException. This error typically occurs when you attempt to access or modify a provisioned concurrency configuration that does not exist. The symptom is usually an error message indicating that the specified provisioned concurrency configuration cannot be found.

Delving into the Issue: What Causes ProvisionedConcurrencyConfigNotFoundException?

The ProvisionedConcurrencyConfigNotFoundException error arises when the AWS Lambda service cannot locate the provisioned concurrency configuration for a specific function version or alias. This can happen if the configuration was never set up, was deleted, or if there is a typo in the specified function name or alias.

Understanding Provisioned Concurrency

Provisioned concurrency is a feature that allows you to pre-allocate a certain number of concurrent executions for your Lambda function, ensuring that they are initialized and ready to respond to requests. This is particularly useful for latency-sensitive applications. For more details, visit the AWS Lambda Concurrency Configuration documentation.

Steps to Resolve ProvisionedConcurrencyConfigNotFoundException

To resolve this issue, follow these steps:

Step 1: Verify the Function Name and Alias

Ensure that the function name and alias you are using are correct. You can list all your Lambda functions and their aliases using the AWS CLI:

aws lambda list-functionsaws lambda list-aliases --function-name <your-function-name>

Step 2: Check Existing Provisioned Concurrency Configurations

Use the AWS CLI to check if a provisioned concurrency configuration exists for your function:

aws lambda get-provisioned-concurrency-config --function-name <your-function-name> --qualifier <alias-or-version>

If the configuration does not exist, you will need to create it.

Step 3: Create or Update the Provisioned Concurrency Configuration

If the configuration is missing, create a new provisioned concurrency configuration:

aws lambda put-provisioned-concurrency-config --function-name <your-function-name> --qualifier <alias-or-version> --provisioned-concurrent-executions <number>

Replace <number> with the desired number of concurrent executions.

Additional Resources

For more information on managing provisioned concurrency, refer to the AWS Lambda Provisioned Concurrency guide. Additionally, the AWS Lambda Homepage provides comprehensive resources and updates on Lambda features.

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