support both JSON and YAML for scheduler configuration

pkg/scheduler/api/latest/BUILD

@@ -16,6 +16,7 @@ go_library(
         "//staging/src/k8s.io/apimachinery/pkg/runtime/schema:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/runtime/serializer/json:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/runtime/serializer/versioning:go_default_library",
+        "//staging/src/k8s.io/apimachinery/pkg/runtime/serializer/yaml:go_default_library",
     ],
 )
 

pkg/scheduler/api/latest/latest.go

@@ -21,6 +21,7 @@ import (
 	"k8s.io/apimachinery/pkg/runtime/schema"
 	"k8s.io/apimachinery/pkg/runtime/serializer/json"
 	"k8s.io/apimachinery/pkg/runtime/serializer/versioning"
+	"k8s.io/apimachinery/pkg/runtime/serializer/yaml"
 	schedulerapi "k8s.io/kubernetes/pkg/scheduler/api"
 	// Init the api v1 package
 	_ "k8s.io/kubernetes/pkg/scheduler/api/v1"
@@ -44,10 +45,11 @@ var Codec runtime.Codec
 
 func init() {
 	jsonSerializer := json.NewSerializer(json.DefaultMetaFactory, schedulerapi.Scheme, schedulerapi.Scheme, true)
+	serializer := yaml.NewDecodingSerializer(jsonSerializer)
 	Codec = versioning.NewDefaultingCodecForScheme(
 		schedulerapi.Scheme,
-		jsonSerializer,
-		jsonSerializer,
+		serializer,
+		serializer,
 		schema.GroupVersion{Version: Version},
 		runtime.InternalGroupVersioner,
 	)