Memorystore Redis should allow updates without instance re-creation

[pdecat]

Memorystore Redis allows updating the following information without re-creating the instance:

• displayName
• labels
• memorySizeGb
• redisConfig (not yet implemented by the terraform provider)

https://cloud.google.com/memorystore/docs/redis/reference/rest/v1beta1/projects.locations.instances/patch

Terraform Version

# terraform version
Terraform v0.11.7
+ provider.external v1.0.0
+ provider.google v1.13.0
+ provider.template v1.0.0

Affected Resource(s)

• google_redis_instance

Terraform Configuration Files

resource "google_redis_instance" "webfront" {
  name = "redis-myproject-euw1"

  tier           = "STANDARD_HA"
  memory_size_gb = "2" # Updated from 1

  region                  = "europe-west1"
  location_id             = "europe-west1-b"
  alternative_location_id = "europe-west1-d"

  redis_version     = "REDIS_3_2"
  reserved_ip_range = "10.0.0.0/29"
}

Expected Behavior

Changing memory_size_gb (or any other modifiable param) should update the existing instance and not require creating a new instance.

Actual Behavior

Changing memory_size_gb requires creating a new instance:

-/+ google_redis_instance.portal (new resource required)
      id:                      "myproject/europe-west1/redis-myproject-euw1" => <computed> (forces new resource)
      alternative_location_id: "europe-west1-d" => "europe-west1-d"
      authorized_network:      "projects/myproject/global/networks/myproject-net0" => <computed>
      create_time:             "2018-05-10T06:40:26.886844Z" => <computed>
      current_location_id:     "europe-west1-d" => <computed>
      host:                    "10.0.0.4" => <computed>
      location_id:             "europe-west1-b" => "europe-west1-b"
      memory_size_gb:          "1" => "2" (forces new resource)
      name:                    "redis-myproject-euw1" => "redis-myproject-euw1"
      port:                    "6379" => <computed>
      project:                 "myproject" => <computed>
      redis_version:           "REDIS_3_2" => "REDIS_3_2"
      region:                  "europe-west1" => "europe-west1"
      reserved_ip_range:       "10.0.0.0/29" => "10.0.0.0/29"
      tier:                    "STANDARD_HA" => "STANDARD_HA"

[pdecat]

Thanks!

[ghost]

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