aws_rds_cluster_parameter_group does not generate a unique name when specifying name_prefix

[majormoses]

Terraform Version

$ terraform --version
Terraform v0.9.11

Your version of Terraform is out of date! The latest version
is 0.10.6. You can update by downloading from www.terraform.io

Affected Resource(s)

Please list the resources as a list, for example:

• aws_rds_cluster_parameter_group

Terraform Configuration Files

####
# RDS Cluster Paramater Group

resource "aws_rds_cluster_parameter_group" "fa-arora" {
  name_prefix = "${var.env}-aurora-params"
  family      = "aurora5.6"
  description = "RDS ${var.env} cluster parameter group"

  parameter {
    name  = "character_set_server"
    value = "utf8"
  }

  parameter {
    name  = "character_set_client"
    value = "utf8"
  }

}
# End of RDS Cluster Paramater Group
####

Debug Output

https://gist.github.com/majormoses/f373836f0219ae37a0079f3938868ce9

Expected Behavior

Terraform should have computed a unique name (using the prefix) and submitted it with the request.

Actual Behavior

It appears that the plan believes it should compute the value but either does and does not submit it or does not compute it. This results in a 400 because the body did not match the requirements:

* aws_rds_cluster_parameter_group.fa-arora: Error modifying DB Cluster Parameter Group: InvalidParameterValue: The parameter DBClusterParameterGroupName must be provided and must not be blank.
	status code: 400, request id: 40a2e32e-a094-11e7-a4f7-21baf61bfe2b

Steps to Reproduce

Please list the steps required to reproduce the issue, for example:

1. terraform plan
2. terraform apply

Important Factoids

None

References

Are there any other GitHub issues (open or closed) or Pull Requests that should be linked here?
Not that I saw

[majormoses]

Commenting out name_prefix and specifying the name attribute works as expected.

[spanktar]

0.10.7 confirmed. name_prefix combined with create_before_destroy.

[richid]

Confirmed in 0.11.5 as well.

Here is a little workaround I'm successfully using:

name = "${var.name}-${lower(replace(timestamp(), ":", ""))}"

which generates strings like

foo-2018-04-26t193814z

Not as elegant as using name_prefix but it gets the job done.

[bflad]

The fix for the aws_rds_cluster_parameter_group resource not correctly applying during resource creation with a generated name or with the name_prefix argument while also including parameter configurations has been merged and will release with version 1.57.0 of the Terraform AWS provider, likely later today. 👍

[bflad]

This has been released in version 1.57.0 of the AWS provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!