ResourceConflictException: … An update is in progress for resource: …

Question

After deploying (update) a Lambda for about 150 times in an automated way using CI, this suddenly fails since in `eu-west-1` since 2021-09-14 ~16:17 CET.   
  
```  
ResourceConflictException: The operation cannot be performed at this time. An update is in progress for resource: arn:aws:lambda:eu-west-1:NNNNNNNN:function:XXXXXXXX  
```  
  
The last successful deploy was 2021-09-14 ~16:17 CET.  
  
The 2 last successful deploys now fail too, with the same error.  
  
Details are described and followed-up in \[claudia/issues/226](https://github.com/claudiajs/claudia/issues/226).  
  
The closest issue comparable to what I see is \[Terraform aws_lambda_function ResourceConflictException due to a concurrent update operation #5154](https://github.com/hashicorp/terraform-provider-aws/issues/5154#issuecomment-423912491), where it says, in 2018,  
  
> OK, I've figured out what's happening here based on a comment here: AWS has some sort of limit on how many concurrent  
> modifications you can make to a Lambda function.  
  
I am pretty sure now that something changed on the side of AWS, either in general, in for this instance.  
  
Does anybody have any clue? Did something change? How can this be mitigated?

jandeca · Answer

This could be related to https://forums.aws.amazon.com/thread.jspa?messageID=949152&#949152

raulbarreto-delivion · Answer

I'm having this same problem. It started yesterday and it only happens with one lambda function. Other lambda functions are deployed just fine.  
  
I also noticed that the ci/cd tool is using an old version of the AWS SDK (1.11.834), and if I deploy the code using AWS CLI (2.2.37) it works. Could this be related?  
  
Edited by: raulbarreto-delivion on Sep 16, 2021 7:11 AM

Stuart · Answer

AWS are rolling out this change  
https://aws.amazon.com/blogs/compute/coming-soon-expansion-of-aws-lambda-states-to-all-functions/  
  
You need to put a check for the function state in between the update_function_code and the publish version calls  
  
Make sure the state is active before proceeding  
https://docs.aws.amazon.com/lambda/latest/dg/functions-states.html

ResourceConflictException: … An update is in progress for resource: …

Relevant content