only prewarm the route table if requested (#1765)

router/default.go

@@ -467,9 +467,11 @@ func (r *router) start() error {
 		return nil
 	}
 
-	// add all local service routes into the routing table
+	if r.options.Prewarm {
-	if err := r.manageRegistryRoutes(r.options.Registry, "create"); err != nil {
+		// add all local service routes into the routing table
-		return fmt.Errorf("failed adding registry routes: %s", err)
+		if err := r.manageRegistryRoutes(r.options.Registry, "create"); err != nil {
+			return fmt.Errorf("failed adding registry routes: %s", err)
+		}
 	}
 
 	// add default gateway into routing table

router/options.go

@@ -23,6 +23,8 @@ type Options struct {
 	Advertise Strategy
 	// Context for additional options
 	Context context.Context
+	// Prewarm the route table on router startup
+	Prewarm bool
 }
 
 // Id sets Router Id
@@ -60,13 +62,20 @@ func Registry(r registry.Registry) Option {
 	}
 }
 
-// Strategy sets route advertising strategy
+// Advertise sets route advertising strategy
 func Advertise(a Strategy) Option {
 	return func(o *Options) {
 		o.Advertise = a
 	}
 }
 
+// Prewarm sets whether to prewarm the route table
+func Prewarm(b bool) Option {
+	return func(o *Options) {
+		o.Prewarm = b
+	}
+}
+
 // DefaultOptions returns router default options
 func DefaultOptions() Options {
 	return Options{