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AWS Lambda (sdk) EventSourceMappingNotFoundException

The specified event source mapping 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. Lambda can be integrated with various AWS services, making it a versatile tool for building scalable applications.

Identifying the Symptom: EventSourceMappingNotFoundException

When working with AWS Lambda, you might encounter the EventSourceMappingNotFoundException. This error typically occurs when you attempt to manage an event source mapping that does not exist. The error message will indicate that the specified event source mapping could not be found, which can halt the execution of your Lambda function.

Exploring the Issue: What Causes EventSourceMappingNotFoundException?

The EventSourceMappingNotFoundException is triggered when the AWS Lambda service cannot locate the event source mapping you specified. This can happen if the mapping ID is incorrect, the mapping has been deleted, or if there are permission issues preventing access to the mapping.

Common Scenarios Leading to This Error

  • Incorrect event source mapping ID provided in the request.
  • The event source mapping has been deleted or never existed.
  • Insufficient permissions to access or manage the event source mapping.

Steps to Resolve EventSourceMappingNotFoundException

To resolve this issue, follow these steps to verify and correct the event source mapping:

Step 1: Verify the Event Source Mapping ID

Ensure that the event source mapping ID you are using is correct. You can list all event source mappings associated with your Lambda function using the AWS CLI:

aws lambda list-event-source-mappings --function-name YourLambdaFunctionName

This command will return a list of event source mappings, allowing you to verify the correct ID.

Step 2: Check for Deletion or Non-Existence

If the mapping ID is correct, ensure that the mapping has not been deleted. If it has been removed, you will need to recreate it. Use the following command to create a new event source mapping:

aws lambda create-event-source-mapping --function-name YourLambdaFunctionName --event-source YourEventSource --batch-size 10

Replace YourEventSource with the ARN of your event source.

Step 3: Verify Permissions

Ensure that your IAM role has the necessary permissions to access and manage event source mappings. The role should have policies that allow actions such as lambda:ListEventSourceMappings and lambda:CreateEventSourceMapping.

Additional Resources

For more information on managing event source mappings, refer to the AWS Lambda Developer Guide. If you continue to experience issues, consider reaching out to AWS Support for further assistance.

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