add initial_size to google_compute_node_group

.changelog/4750.txt

@@ -0,0 +1,3 @@
+```release-note:enhancement
+compute: added `initial_size` to account for scenarios where size may change under the hood in resource `google_compute_node_group`
+```

google/resource_compute_node_group.go

@@ -18,6 +18,7 @@ import (
 	"fmt"
 	"log"
 	"reflect"
+	"regexp"
 	"strconv"
 	"time"
 
@@ -49,12 +50,6 @@ func resourceComputeNodeGroup() *schema.Resource {
 				DiffSuppressFunc: compareSelfLinkOrResourceName,
 				Description:      `The URL of the node template to which this node group belongs.`,
 			},
-			"size": {
-				Type:        schema.TypeInt,
-				Required:    true,
-				ForceNew:    true,
-				Description: `The total number of nodes in the node group.`,
-			},
 			"autoscaling_policy": {
 				Type:     schema.TypeList,
 				Computed: true,
@@ -103,6 +98,13 @@ than or equal to max-nodes. The default value is 0.`,
 				ForceNew:    true,
 				Description: `An optional textual description of the resource.`,
 			},
+			"initial_size": {
+				Type:         schema.TypeInt,
+				Optional:     true,
+				ForceNew:     true,
+				Description:  `The initial number of nodes in the node group. One of 'initial_size' or 'size' must be specified.`,
+				ExactlyOneOf: []string{"size", "initial_size"},
+			},
 			"maintenance_policy": {
 				Type:        schema.TypeString,
 				Optional:    true,
@@ -133,6 +135,14 @@ than or equal to max-nodes. The default value is 0.`,
 				ForceNew:    true,
 				Description: `Name of the resource.`,
 			},
+			"size": {
+				Type:         schema.TypeInt,
+				Computed:     true,
+				Optional:     true,
+				ForceNew:     true,
+				Description:  `The total number of nodes in the node group. One of 'initial_size' or 'size' must be specified.`,
+				ExactlyOneOf: []string{"size", "initial_size"},
+			},
 			"zone": {
 				Type:             schema.TypeString,
 				Computed:         true,
@@ -218,7 +228,7 @@ func resourceComputeNodeGroupCreate(d *schema.ResourceData, meta interface{}) er
 		obj["zone"] = zoneProp
 	}
 
-	url, err := replaceVars(d, config, "{{ComputeBasePath}}projects/{{project}}/zones/{{zone}}/nodeGroups?initialNodeCount={{size}}")
+	url, err := replaceVars(d, config, "{{ComputeBasePath}}projects/{{project}}/zones/{{zone}}/nodeGroups?initialNodeCount=PRE_CREATE_REPLACE_ME")
 	if err != nil {
 		return err
 	}
@@ -237,6 +247,14 @@ func resourceComputeNodeGroupCreate(d *schema.ResourceData, meta interface{}) er
 		billingProject = bp
 	}
 
+	var sizeParam string
+	if v, ok := d.GetOkExists("size"); ok {
+		sizeParam = fmt.Sprintf("%v", v)
+	} else if v, ok := d.GetOkExists("initial_size"); ok {
+		sizeParam = fmt.Sprintf("%v", v)
+	}
+
+	url = regexp.MustCompile("PRE_CREATE_REPLACE_ME").ReplaceAllLiteralString(url, sizeParam)
 	res, err := sendRequestWithTimeout(config, "POST", billingProject, url, userAgent, obj, d.Timeout(schema.TimeoutCreate))
 	if err != nil {
 		return fmt.Errorf("Error creating NodeGroup: %s", err)

google/resource_compute_node_group_generated_test.go

@@ -42,7 +42,7 @@ func TestAccComputeNodeGroup_nodeGroupBasicExample(t *testing.T) {
 				ResourceName:            "google_compute_node_group.nodes",
 				ImportState:             true,
 				ImportStateVerify:       true,
-				ImportStateVerifyIgnore: []string{"node_template", "zone"},
+				ImportStateVerifyIgnore: []string{"node_template", "initial_size", "zone"},
 			},
 		},
 	})
@@ -86,7 +86,7 @@ func TestAccComputeNodeGroup_nodeGroupAutoscalingPolicyExample(t *testing.T) {
 				ResourceName:            "google_compute_node_group.nodes",
 				ImportState:             true,
 				ImportStateVerify:       true,
-				ImportStateVerifyIgnore: []string{"node_template", "zone"},
+				ImportStateVerifyIgnore: []string{"node_template", "initial_size", "zone"},
 			},
 		},
 	})
@@ -108,7 +108,7 @@ resource "google_compute_node_group" "nodes" {
   maintenance_window {
     start_time = "08:00"
   }
-  size          = 1
+  initial_size  = 1
   node_template = google_compute_node_template.soletenant-tmpl.id
   autoscaling_policy {
     mode      = "ONLY_SCALE_OUT"

website/docs/r/compute_node_group.html.markdown

@@ -83,7 +83,7 @@ resource "google_compute_node_group" "nodes" {
   maintenance_window {
     start_time = "08:00"
   }
-  size          = 1
+  initial_size  = 1
   node_template = google_compute_node_template.soletenant-tmpl.id
   autoscaling_policy {
     mode      = "ONLY_SCALE_OUT"
@@ -102,10 +102,6 @@ The following arguments are supported:
   (Required)
   The URL of the node template to which this node group belongs.
 
-* `size` -
-  (Required)
-  The total number of nodes in the node group.
-
 
 - - -
 
@@ -118,6 +114,14 @@ The following arguments are supported:
   (Optional)
   Name of the resource.
 
+* `size` -
+  (Optional)
+  The total number of nodes in the node group. One of `initial_size` or `size` must be specified.
+
+* `initial_size` -
+  (Optional)
+  The initial number of nodes in the node group. One of `initial_size` or `size` must be specified.
+
 * `maintenance_policy` -
   (Optional)
   Specifies how to handle instances when a node in the group undergoes maintenance. Set to one of: DEFAULT, RESTART_IN_PLACE, or MIGRATE_WITHIN_NODE_GROUP. The default value is DEFAULT.