[Bug]: During minor RDS version upgrade - InvalidParameterCombination The parameter db-instance-parameter-group-name can only be specified for a major version upgrade.

[mwheeler-ep]

Terraform Core Version

1.3.5

AWS Provider Version

4.62

Affected Resource(s)

• aws_rds_cluster

Expected Behavior

RDS is modified and the minor version is upgraded successfully.

Actual Behavior

Minor upgrade fails with error:

aws_rds_cluster.pg_cluster: Modifying... [id=xxxx]
╷
│ Error: updating RDS Cluster (): InvalidParameterCombination: The parameter db-instance-parameter-group-name can only be specified for a major version upgrade.
│ 	status code: 400, request id: 
│ 
│   with aws_rds_cluster.pg_cluster,
│   on main.tf line 293, in resource "aws_rds_cluster" "pg_cluster":
│  293: resource "aws_rds_cluster" "pg_cluster" {
│ 

Relevant Error/Panic Output Snippet

No response

Terraform Configuration Files

resource "aws_rds_cluster" "pg_cluster" {
  cluster_identifier               = "${local.common_resource_name_prefix}-cluster"
  engine                           = "aurora-postgresql"
  engine_version                   = var.engine_version
  db_instance_parameter_group_name = aws_db_parameter_group.aurora_db_parameter_group.id

  lifecycle {
    ignore_changes = [
      cluster_identifier,
      db_subnet_group_name,
    ]
  }
}

Steps to Reproduce

Start with aurora postgres cluster version "14.6" and upgrade to "14.7"

Debug Output

No response

Panic Output

No response

Important Factoids

This is a 4.62 regression. Downgrading to 4.61 resolves the issue.

References

Likely breaking change regarding : https://github.com/hashicorp/terraform-provider-aws/pull/30247/files#diff-c3e8b88d6446964a8d0e447c7c0ee2c3eba183f2d76bec3de78b756ef6773515R1155 where db_instance_parameter_group_name is now always sent.

Would you like to implement a fix?

No

[github-actions]

Community Note

Voting for Prioritization

• Please vote on this issue by adding a 👍 reaction to the original post to help the community and maintainers prioritize this request.
• Please see our prioritization guide for information on how we prioritize.
• Please do not leave "+1" or other comments that do not add relevant new information or questions, they generate extra noise for issue followers and do not help prioritize the request.

Volunteering to Work on This Issue

• If you are interested in working on this issue, please leave a comment.
• If this would be your first contribution, please review the contribution guide.

[github-actions]

This functionality has been released in v4.63.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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 have found a problem that seems similar to this, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.