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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 and deploying applications, allowing developers to focus on writing code rather than managing infrastructure.

Identifying the Symptom: ProvisionedConcurrencyConfigNotFoundException

When working with AWS Lambda, you may encounter the error ProvisionedConcurrencyConfigNotFoundException. This error indicates that the provisioned concurrency configuration you specified does not exist. This can be frustrating as it prevents your Lambda function from executing with the desired concurrency settings.

Exploring the Issue: What Causes ProvisionedConcurrencyConfigNotFoundException?

The ProvisionedConcurrencyConfigNotFoundException error occurs when AWS Lambda cannot find the specified provisioned concurrency configuration. This typically happens if the configuration was never created, was deleted, or if there is a typo in the configuration name. Provisioned concurrency is a feature that ensures a set number of instances of your function are initialized and ready to respond to requests, which is crucial for applications requiring consistent start-up latency.

Common Scenarios Leading to This Error

  • Attempting to update or delete a non-existent provisioned concurrency configuration.
  • Incorrect function name or alias specified in the request.
  • Configuration was deleted or not properly set up initially.

Steps to Fix the ProvisionedConcurrencyConfigNotFoundException

To resolve this issue, follow these steps:

Step 1: Verify the Function and Alias

Ensure that the function name and alias you are using in your request are correct. You can list all functions and 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 and alias:

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

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

Step 3: Create a New Provisioned Concurrency Configuration

If the configuration is missing, create a new one using the following command:

aws lambda put-provisioned-concurrency-config --function-name <your-function-name> --qualifier <alias-name> --provisioned-concurrent-executions <desired-count>

Step 4: Monitor and Validate

After creating the configuration, monitor your function to ensure it is working as expected. You can use AWS CloudWatch to track metrics and logs related to your Lambda function.

Additional Resources

For more information on AWS Lambda and provisioned concurrency, refer to the following resources:

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