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AWS Lambda (sdk) ResourceInUseException encountered when attempting to modify a Lambda function.

The resource is currently in use and cannot be modified.

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 is designed to handle various workloads, from simple automation tasks to complex data processing pipelines.

Identifying the Symptom: ResourceInUseException

When working with AWS Lambda, you might encounter the ResourceInUseException. This error typically occurs when you attempt to modify a Lambda function or its resources while they are currently being used by another process. The error message might look like this:

{
"errorMessage": "ResourceInUseException: The resource is currently in use and cannot be modified."
}

Exploring the Issue: What Causes ResourceInUseException?

The ResourceInUseException is triggered when a resource, such as a Lambda function, is locked by another operation. This can happen if:

  • The Lambda function is being updated or deployed.
  • Another process is currently executing the function.
  • There is a pending change that has not yet been completed.

Understanding the root cause is crucial for resolving this issue effectively.

Steps to Resolve ResourceInUseException

Step 1: Identify Ongoing Processes

First, check if there are any ongoing processes or deployments affecting the Lambda function. You can do this by reviewing the AWS Lambda console or using the AWS CLI:

aws lambda list-functions

Look for any functions that are currently being updated or deployed.

Step 2: Wait for Processes to Complete

If a deployment or update is in progress, wait for it to complete before attempting any modifications. You can monitor the status of the function in the AWS Lambda console.

Step 3: Ensure No Concurrent Executions

Make sure that the function is not being executed concurrently by another process. You can check the invocation metrics in the AWS CloudWatch console to see if the function is currently running.

Step 4: Retry the Operation

Once you have confirmed that no processes are using the resource, retry the operation. If the issue persists, consider increasing the function's concurrency limits or reviewing the function's configuration for potential conflicts.

Additional Resources

For more information on managing AWS Lambda functions, refer to the following resources:

Master 

AWS Lambda (sdk) ResourceInUseException encountered when attempting to modify a Lambda function.

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