Bigtable: Retry GC policy operations with a longer poll interval

.changelog/6627.txt

@@ -0,0 +1,3 @@
+```release-note:enhancement
+bigtable: retry GC policy operations with a longer poll interval
+```

google/resource_bigtable_gc_policy.go

@@ -202,10 +202,17 @@ func resourceBigtableGCPolicyUpsert(d *schema.ResourceData, meta interface{}) er
 	tableName := d.Get("table").(string)
 	columnFamily := d.Get("column_family").(string)
 
-	err = retryTimeDuration(func() error {
+	retryFunc := func() (interface{}, error) {
 		reqErr := c.SetGCPolicy(ctx, tableName, columnFamily, gcPolicy)
-		return reqErr
-	}, d.Timeout(schema.TimeoutCreate), isBigTableRetryableError)
+		return "", reqErr
+	}
+	// The default create timeout is 20 minutes.
+	timeout := d.Timeout(schema.TimeoutCreate)
+	pollInterval := time.Duration(30) * time.Second
+	// Mutations to gc policies can only happen one-at-a-time and take some amount of time.
+	// Use a fixed polling rate of 30s based on the RetryInfo returned by the server rather than
+	// the standard up-to-10s exponential backoff for those operations.
+	_, err = retryWithPolling(retryFunc, timeout, pollInterval, isBigTableRetryableError)
 	if err != nil {
 		return err
 	}
@@ -376,10 +383,14 @@ func resourceBigtableGCPolicyDestroy(d *schema.ResourceData, meta interface{}) e
 
 	defer c.Close()
 
-	err = retryTimeDuration(func() error {
+	retryFunc := func() (interface{}, error) {
 		reqErr := c.SetGCPolicy(ctx, d.Get("table").(string), d.Get("column_family").(string), bigtable.NoGcPolicy())
-		return reqErr
-	}, d.Timeout(schema.TimeoutDelete), isBigTableRetryableError)
+		return "", reqErr
+	}
+	// The default delete timeout is 20 minutes.
+	timeout := d.Timeout(schema.TimeoutDelete)
+	pollInterval := time.Duration(30) * time.Second
+	_, err = retryWithPolling(retryFunc, timeout, pollInterval, isBigTableRetryableError)
 	if err != nil {
 		return err
 	}