aws_lb_target_group protocol_version update should destroy/create

[github-vincent-miszczak]

Affected Resource(s)

aws_lb_target_group

Using 3.27.0.

Expected Behavior

Changing property protocol_version from GRPC to HTTP2 should trigger a destroy/create.

Actual Behavior

# aws_lb_target_group.XXX will be updated in-place
~ resource "aws_lb_target_group" "XXX" {
  ...
    ~ protocol_version                   = "GRPC" -> "HTTP2"
    ...
  }

TF wants to modify the resource.
When applied, no error occurs but the value is not updated, and another plan wants to apply the update again.

In my case, I did change the healthcheck endpoint at the same time, expecting the updated protocol would be used. The endpoint was changed but not the protocol, healtchcheck failed and my ASG was drained 💥

Steps to Reproduce

Create a resource aws_lb_target_group with protocol_version = GRPC then update to HTTP2 and notice the change is not applied.

[ewbankkit]

Relates:

• Use gRPC matcher with gRPC protocol #17534

The diff is being suppressed here:

terraform-provider-aws/aws/resource_aws_lb_target_group.go

Lines 89 to 97 in 7546a7f

	DiffSuppressFunc: func(k, old, new string, d *schema.ResourceData) bool {
	if d.Get("target_type").(string) == elbv2.TargetTypeEnumLambda {
	return true
	}
	switch d.Get("protocol").(string) {
	case elbv2.ProtocolEnumHttp, elbv2.ProtocolEnumHttps:
	return false
	}
	return true

[coolbananas118]

We ran into a similar issue. We are trying to change protocol_version = "HTTP1" -> "HTTP2" and it's not being applied. TF says it'll be done in place but from what I see in the AWS console you can't change this setting therefore it would required a drop/create.

[dizlv]

Same here: protocol_version = "HTTP2" -> "HTTP1" and tries to update the resource in-place, but nothing actual happens.
Provider Version: 3.37.0.

Had to use terraform taint for that specific resource to force re-creation.

[github-actions]

This functionality has been released in v4.50.0 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.