Deployment , and rollback, fails when removing ProvisionedConcurrency configuration from Function

[mikebroberts]

If you remove the ProvisionedConcurrencyConfig section from an existing AWS::Serverless::Function resource then deployment fails with the message:

"Alias with weights can not be used with Provisioned Concurrency (Service: AWSLambdaInternal; Status Code: 400; Error Code: InvalidParameterValueException; Request ID: ...)"

What's especially nasty about this is that the CloudFormation rollback then fails, leaving the stack in UPDATE_ROLLBACK_FAILED state, and sam deploy never finishes.

I'm not impacted by this in production - I'm only experimenting - but I thought you all might want to know.

For reference my initial SAM resource was:

  HelloWorldLambda:
    Type: AWS::Serverless::Function
    Properties:
      Runtime: java8
      MemorySize: 512
      Handler: book.HelloWorld::handler
      CodeUri: target/lambda.jar
      AutoPublishAlias: live
      ProvisionedConcurrencyConfig:
        ProvisionedConcurrentExecutions: 100

And I then removed the ProvisionedConcurrencyConfig (and child ProvisionedConcurrentExecutions) property.

Mike