Dataplane V2 is immutable but resource updated in place

[brettcurtis]

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Terraform Version

Terraform v1.3.1
on linux_amd64
+ provider registry.terraform.io/hashicorp/google v4.38.0
+ provider registry.terraform.io/hashicorp/kubernetes v2.13.1

Affected Resource(s)

• google_container_cluster

Terraform Configuration Files

Terraform used the selected providers to generate the following execution
plan. Resource actions are indicated with the following symbols:
  ~ update in-place

Terraform will perform the following actions:

  # module.kubernetes_engine.google_container_cluster.this will be updated in-place
  ~ resource "google_container_cluster" "this" ***
      + datapath_provider           = "ADVANCED_DATAPATH"
        id                          = "projects/my-project-tf1ed0cd-sb/locations/us-east1/clusters/development-tools-us-east1"
        name                        = "development-tools-us-east1"
        # (27 unchanged attributes hidden)

        # (22 unchanged blocks hidden)
    ***

Debug Output

Expected Behavior

Cluster should be destroyed and recreated

Actual Behavior

Apply ran fine but obviously cluster was not updated.

Steps to Reproduce

Build cluster with default datapath_provider then change to "ADVANCED_DATAPATH"

References

Other folks see the same behavior: terraform-google-modules/terraform-google-kubernetes-engine#656 (comment)

[edwardmedia]

Can repro on datapath_provider = "LEGACY_DATAPATH"

It looks like ADVANCED_DATAPATH can't be used as IPAllocationPolicy.UseIPAliases has not be implemented yet

│ Error: googleapi: Error 400: Clusters with DatapathProvider=ADVANCED_DATAPATH must set IPAllocationPolicy.UseIPAliases to true., badRequest
│ 
│   with google_container_cluster.primary,
│   on main.tf line 6, in resource "google_container_cluster" "primary":
│    6: resource "google_container_cluster" "primary" {

[edwardmedia]

b/254123801

[edwardmedia]

API teams has confirmed this field currently is immutable but will be made mutable sometime in 2023.

[github-actions]

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