diff --git a/cluster/cluster_impl/failback_cluster_invoker.go b/cluster/cluster_impl/failback_cluster_invoker.go
index 7654e42ecb874a73bb3f00427fa38cb18ea480a3..5e0d133a670160df4acf321ea05356cb2a45a8b5 100644
--- a/cluster/cluster_impl/failback_cluster_invoker.go
+++ b/cluster/cluster_impl/failback_cluster_invoker.go
@@ -77,8 +77,7 @@ func (invoker *failbackClusterInvoker) tryTimerTaskProc(ctx context.Context, ret
 	invoked = append(invoked, retryTask.lastInvoker)
 
 	retryInvoker := invoker.doSelect(retryTask.loadbalance, retryTask.invocation, retryTask.invokers, invoked)
-	var result protocol.Result
-	result = retryInvoker.Invoke(ctx, retryTask.invocation)
+	result := retryInvoker.Invoke(ctx, retryTask.invocation)
 	if result.Error() != nil {
 		retryTask.lastInvoker = retryInvoker
 		invoker.checkRetry(retryTask, result.Error())
diff --git a/cluster/router/chain/chain.go b/cluster/router/chain/chain.go
index 8b98acb5821f257a129e8e5455af074a32a7257b..fccce838bb3f6750b72b83c4991ad78e8b49f138 100644
--- a/cluster/router/chain/chain.go
+++ b/cluster/router/chain/chain.go
@@ -195,7 +195,7 @@ func (c *RouterChain) copyInvokerIfNecessary(cache *InvokerCache) []protocol.Inv
 func (c *RouterChain) buildCache() {
 	origin := c.loadCache()
 	invokers := c.copyInvokerIfNecessary(origin)
-	if invokers == nil || len(invokers) == 0 {
+	if len(invokers) == 0 {
 		return
 	}
 
diff --git a/cluster/router/chain/chain_test.go b/cluster/router/chain/chain_test.go
index 92c59d76d5e46d5e20ffb0d274ecfc5c7a9fb3e3..a2b5642b806c7179017be0dd9c0bccc6123ba48c 100644
--- a/cluster/router/chain/chain_test.go
+++ b/cluster/router/chain/chain_test.go
@@ -238,6 +238,7 @@ conditions:
 
 func TestRouterChainRouteNoRoute(t *testing.T) {
 	ts, z, _, err := zookeeper.NewMockZookeeperClient("test", 15*time.Second)
+	assert.Nil(t, err)
 	defer func() {
 		err := ts.Stop()
 		assert.NoError(t, err)
@@ -247,6 +248,7 @@ func TestRouterChainRouteNoRoute(t *testing.T) {
 	zkUrl, _ := common.NewURL(fmt.Sprintf(zkFormat, localIP, ts.Servers[0].Port))
 	configuration, err := extension.GetConfigCenterFactory(zk).GetDynamicConfiguration(zkUrl)
 	config.GetEnvInstance().SetDynamicConfiguration(configuration)
+	assert.Nil(t, err)
 
 	chain, err := NewRouterChain(getConditionNoRouteUrl(applicationKey))
 	assert.Nil(t, err)
diff --git a/cluster/router/condition/listenable_router.go b/cluster/router/condition/listenable_router.go
index 0b47310dbfe9987a593bc2d0d949a76f08052114..102d766a8a787b460c878c42e8327c1a57ea9588 100644
--- a/cluster/router/condition/listenable_router.go
+++ b/cluster/router/condition/listenable_router.go
@@ -47,8 +47,8 @@ type listenableRouter struct {
 	conditionRouters []*ConditionRouter
 	routerRule       *RouterRule
 	url              *common.URL
-	force            bool
-	priority         int64
+	//force            bool
+	priority int64
 }
 
 // RouterRule Get RouterRule instance from listenableRouter
diff --git a/cluster/router/tag/file.go b/cluster/router/tag/file.go
index 94daf1508eb7b3f4d8a8cacdbd6ed634be6852da..a51ae69cf26fa6e7d10444a23cbff339a5a99b3e 100644
--- a/cluster/router/tag/file.go
+++ b/cluster/router/tag/file.go
@@ -41,7 +41,7 @@ type FileTagRouter struct {
 	router     *tagRouter
 	routerRule *RouterRule
 	url        *common.URL
-	force      bool
+	//force      bool
 }
 
 // NewFileTagRouter Create file tag router instance with content (from config file)
diff --git a/cluster/router/tag/router_rule.go b/cluster/router/tag/router_rule.go
index c0a2d763ae7396ae41694f558f443d46084c3357..512d8f10795b04a18947396be8ae7fa6c4f49d4a 100644
--- a/cluster/router/tag/router_rule.go
+++ b/cluster/router/tag/router_rule.go
@@ -84,9 +84,9 @@ func (t *RouterRule) getTagNames() []string {
 	return result
 }
 
-func (t *RouterRule) hasTag(tag string) bool {
-	return len(t.TagNameToAddresses[tag]) > 0
-}
+//func (t *RouterRule) hasTag(tag string) bool {
+//	return len(t.TagNameToAddresses[tag]) > 0
+//}
 
 func (t *RouterRule) getAddressToTagNames() map[string][]string {
 	return t.AddressToTagNames
@@ -96,10 +96,10 @@ func (t *RouterRule) getTagNameToAddresses() map[string][]string {
 	return t.TagNameToAddresses
 }
 
-func (t *RouterRule) getTags() []Tag {
-	return t.Tags
-}
+//func (t *RouterRule) getTags() []Tag {
+//	return t.Tags
+//}
 
-func (t *RouterRule) setTags(tags []Tag) {
-	t.Tags = tags
-}
+//func (t *RouterRule) setTags(tags []Tag) {
+//	t.Tags = tags
+//}
diff --git a/cluster/router/tag/tag_router.go b/cluster/router/tag/tag_router.go
index c7f53047c1e2beee4545a10302e9f307f06c33d8..984ecb4eeff71dd692cbda8db5e3b87dbdde4254 100644
--- a/cluster/router/tag/tag_router.go
+++ b/cluster/router/tag/tag_router.go
@@ -53,7 +53,7 @@ type addrMetadata struct {
 	// application name
 	application string
 	// is rule a runtime rule
-	ruleRuntime bool
+	//ruleRuntime bool
 	// is rule a force rule
 	ruleForce bool
 	// is rule a valid rule
@@ -227,7 +227,7 @@ func (c *tagRouter) Pool(invokers []protocol.Invoker) (router.AddrPool, router.A
 
 // fetchRuleIfNecessary fetches, parses rule and register listener for the further change
 func (c *tagRouter) fetchRuleIfNecessary(invokers []protocol.Invoker) {
-	if invokers == nil || len(invokers) == 0 {
+	if len(invokers) == 0 {
 		return
 	}
 
diff --git a/cluster/router/tag/tag_router_test.go b/cluster/router/tag/tag_router_test.go
index 20b511ddbd38dcca344f2a5cb7a662cebc37e39b..26c4b8352ba1fce4f6204628f6c09309e3b607d3 100644
--- a/cluster/router/tag/tag_router_test.go
+++ b/cluster/router/tag/tag_router_test.go
@@ -237,7 +237,7 @@ func TestRouteBeijingInvoker(t *testing.T) {
 
 type DynamicTagRouter struct {
 	suite.Suite
-	rule *RouterRule
+	//rule *RouterRule
 
 	route       *tagRouter
 	zkClient    *zookeeper.ZookeeperClient
diff --git a/common/config/environment.go b/common/config/environment.go
index 44cdd1fca18bfed306b135fe38ef536779e148aa..c5651a335444e06f12eb5af831d878ffdbbaeb9f 100644
--- a/common/config/environment.go
+++ b/common/config/environment.go
@@ -34,8 +34,8 @@ import (
 // We just have config center configuration which can override configuration in consumer.yaml & provider.yaml.
 // But for add these features in future ,I finish the environment struct following Environment class in java.
 type Environment struct {
-	configCenterFirst    bool
-	externalConfigs      sync.Map
+	configCenterFirst bool
+	//externalConfigs      sync.Map
 	externalConfigMap    sync.Map
 	appExternalConfigMap sync.Map
 	dynamicConfiguration config_center.DynamicConfiguration
diff --git a/common/constant/key.go b/common/constant/key.go
index d020b9d40bbfd195345d1d24487d66cbe43ad5a3..12e3096e5af7f3075de8cd71fcb72061fb37ad0c 100644
--- a/common/constant/key.go
+++ b/common/constant/key.go
@@ -17,6 +17,8 @@
 
 package constant
 
+type DubboCtxKey string
+
 const (
 	ASYNC_KEY = "async" // it's value should be "true" or "false" of string type
 )
@@ -47,8 +49,8 @@ const (
 	PORT_KEY                 = "port"
 	PROTOCOL_KEY             = "protocol"
 	PATH_SEPARATOR           = "/"
-	DUBBO_KEY                = "dubbo"
-	SSL_ENABLED_KEY          = "ssl-enabled"
+	//DUBBO_KEY                = "dubbo"
+	SSL_ENABLED_KEY = "ssl-enabled"
 )
 
 const (
@@ -92,7 +94,7 @@ const (
 )
 
 const (
-	DUBBOGO_CTX_KEY = "dubbogo-ctx"
+	DUBBOGO_CTX_KEY = DubboCtxKey("dubbogo-ctx")
 )
 
 const (
@@ -201,8 +203,6 @@ const (
 	TRACING_REMOTE_SPAN_CTX = "tracing.remote.span.ctx"
 )
 
-type AttachmentCtxKey string
-
 // Use for router module
 const (
 	// ConditionRouterName Specify file condition router name
@@ -240,7 +240,7 @@ const (
 	Tagkey      = "dubbo.tag"
 
 	// Attachment key in context in invoker
-	AttachmentKey = AttachmentCtxKey("attachment")
+	AttachmentKey = DubboCtxKey("attachment")
 )
 
 const (
diff --git a/common/rpc_service_test.go b/common/rpc_service_test.go
index 048e623c64db4a56cbb1cb202601d650a47c366c..e8bd3933da89b0a6c607f776eae1bb8603f8f467 100644
--- a/common/rpc_service_test.go
+++ b/common/rpc_service_test.go
@@ -27,6 +27,10 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
+import (
+	"github.com/apache/dubbo-go/common/constant"
+)
+
 const (
 	referenceTestPath             = "com.test.Path"
 	referenceTestPathDistinct     = "com.test.Path1"
@@ -125,7 +129,7 @@ func TestServiceMapUnRegister(t *testing.T) {
 	err = ServiceMap.UnRegister("", testProtocol, ServiceKey("TestService", "", "v0"))
 	assert.EqualError(t, err, "no service for TestService:v0")
 
-	// succ
+	// success
 	err = ServiceMap.UnRegister("TestService", testProtocol, ServiceKey("TestService", "", "v1"))
 	assert.NoError(t, err)
 }
@@ -133,16 +137,12 @@ func TestServiceMapUnRegister(t *testing.T) {
 func TestMethodTypeSuiteContext(t *testing.T) {
 	mt := &MethodType{ctxType: reflect.TypeOf(context.TODO())}
 	ctx := context.Background()
-	type ctxKey string
-	key := ctxKey("key")
+	key := constant.DubboCtxKey("key")
 	ctx = context.WithValue(ctx, key, "value")
 	assert.Equal(t, reflect.ValueOf(ctx), mt.SuiteContext(ctx))
-
-	assert.Equal(t, reflect.Zero(mt.ctxType), mt.SuiteContext(nil))
 }
 
 func TestSuiteMethod(t *testing.T) {
-
 	s := &TestService{}
 	method, ok := reflect.TypeOf(s).MethodByName("MethodOne")
 	assert.True(t, ok)
diff --git a/common/url.go b/common/url.go
index 8faa0f08ce004441619898e8cc451102c7ddc796..87cacfd7fb68bd061c2d18c0b3216fc336f7228a 100644
--- a/common/url.go
+++ b/common/url.go
@@ -415,6 +415,9 @@ func (c *URL) Service() string {
 func (c *URL) AddParam(key string, value string) {
 	c.paramsLock.Lock()
 	defer c.paramsLock.Unlock()
+	if c.params == nil {
+		c.params = url.Values{}
+	}
 	c.params.Add(key, value)
 }
 
@@ -433,6 +436,9 @@ func (c *URL) AddParamAvoidNil(key string, value string) {
 func (c *URL) SetParam(key string, value string) {
 	c.paramsLock.Lock()
 	defer c.paramsLock.Unlock()
+	if c.params == nil {
+		c.params = url.Values{}
+	}
 	c.params.Set(key, value)
 }
 
@@ -440,7 +446,9 @@ func (c *URL) SetParam(key string, value string) {
 func (c *URL) DelParam(key string) {
 	c.paramsLock.Lock()
 	defer c.paramsLock.Unlock()
-	c.params.Del(key)
+	if c.params != nil {
+		c.params.Del(key)
+	}
 }
 
 // ReplaceParams will replace the URL.params
@@ -466,10 +474,15 @@ func (c *URL) RangeParams(f func(key, value string) bool) {
 func (c *URL) GetParam(s string, d string) string {
 	c.paramsLock.RLock()
 	defer c.paramsLock.RUnlock()
-	r := c.params.Get(s)
+
+	var r string
+	if len(c.params) > 0 {
+		r = c.params.Get(s)
+	}
 	if len(r) == 0 {
 		r = d
 	}
+
 	return r
 }
 
diff --git a/common/url_test.go b/common/url_test.go
index 1f5c40937d3d4aee5e93133a82c8067c7a62de4c..4008f6a3d3ab7d4131cf767ccc835b69c248f0fe 100644
--- a/common/url_test.go
+++ b/common/url_test.go
@@ -70,9 +70,8 @@ func TestURL(t *testing.T) {
 
 	urlInst := URL{}
 	urlInst.noCopy.Lock()
+	urlInst.SetParam("hello", "world")
 	urlInst.noCopy.Unlock()
-	urlInst.baseUrl.paramsLock.Lock()
-	urlInst.baseUrl.paramsLock.Unlock()
 
 	assert.Equal(t, "/com.ikurento.user.UserProvider", u.Path)
 	assert.Equal(t, "127.0.0.1:20000", u.Location)
diff --git a/config/base_config.go b/config/base_config.go
index 0cc6eec26c51cb7dfc164a3d43545f6b22658ca0..7cb25a50793b94f2ec2fd8c60e6b93a50b8e77ab 100644
--- a/config/base_config.go
+++ b/config/base_config.go
@@ -45,7 +45,7 @@ type BaseConfig struct {
 	// application config
 	ApplicationConfig *ApplicationConfig `yaml:"application" json:"application,omitempty" property:"application"`
 
-	prefix              string
+	//prefix              string
 	fatherConfig        interface{}
 	EventDispatcherType string        `default:"direct" yaml:"event_dispatcher_type" json:"event_dispatcher_type,omitempty"`
 	MetricConfig        *MetricConfig `yaml:"metrics" json:"metrics,omitempty"`
diff --git a/config/base_config_test.go b/config/base_config_test.go
index 9e5565fc115e45b6dd0e598bd4ff5a67394ebc99..566b49bea7df8a14543347a196d136a8c059a0b5 100644
--- a/config/base_config_test.go
+++ b/config/base_config_test.go
@@ -107,6 +107,7 @@ var baseMockRef = map[string]*ReferenceConfig{
 
 func TestRefresh(t *testing.T) {
 	c := &BaseConfig{}
+	c.fileStream = nil
 	mockMap := getMockMap()
 	mockMap["dubbo.shutdown.timeout"] = "12s"
 
diff --git a/config/config_center_config.go b/config/config_center_config.go
index 3bb856415d77344658055f03ccc4a6edd8c0f48a..940b7be951d83a041ebc8121e65a9bd2fd09594b 100644
--- a/config/config_center_config.go
+++ b/config/config_center_config.go
@@ -18,10 +18,8 @@
 package config
 
 import (
-	"context"
 	"net/url"
 	"reflect"
-	"time"
 )
 
 import (
@@ -46,7 +44,7 @@ import (
 //
 // ConfigCenter has currently supported Zookeeper, Nacos, Etcd, Consul, Apollo
 type ConfigCenterConfig struct {
-	context       context.Context
+	//context       context.Context
 	Protocol      string `required:"true"  yaml:"protocol"  json:"protocol,omitempty"`
 	Address       string `yaml:"address" json:"address,omitempty"`
 	Cluster       string `yaml:"cluster" json:"cluster,omitempty"`
@@ -60,7 +58,7 @@ type ConfigCenterConfig struct {
 	AppId         string `default:"dubbo" yaml:"app_id"  json:"app_id,omitempty"`
 	TimeoutStr    string `yaml:"timeout"  json:"timeout,omitempty"`
 	RemoteRef     string `required:"false"  yaml:"remote_ref"  json:"remote_ref,omitempty"`
-	timeout       time.Duration
+	//timeout       time.Duration
 }
 
 // UnmarshalYAML unmarshals the ConfigCenterConfig by @unmarshal function
diff --git a/config/config_loader.go b/config/config_loader.go
index ec591aad6526e5841656465e71465413d01ad5ba..35910981d128bdca7d63973328e2752ecfef6933 100644
--- a/config/config_loader.go
+++ b/config/config_loader.go
@@ -406,9 +406,9 @@ func GetBaseConfig() *BaseConfig {
 			baseConfig = &BaseConfig{
 				MetricConfig:       &MetricConfig{},
 				ConfigCenterConfig: &ConfigCenterConfig{},
-				Remotes:            make(map[string]*RemoteConfig, 0),
+				Remotes:            make(map[string]*RemoteConfig),
 				ApplicationConfig:  &ApplicationConfig{},
-				ServiceDiscoveries: make(map[string]*ServiceDiscoveryConfig, 0),
+				ServiceDiscoveries: make(map[string]*ServiceDiscoveryConfig),
 			}
 		}
 	}
diff --git a/config_center/apollo/impl.go b/config_center/apollo/impl.go
index c69fc2f66b23cd877b447fc78084fb9197c253aa..cb0f03d54a2ea180543ec528e3a46be45067179c 100644
--- a/config_center/apollo/impl.go
+++ b/config_center/apollo/impl.go
@@ -146,8 +146,7 @@ func (c *apolloConfiguration) getAddressWithProtocolPrefix(url *common.URL) stri
 	address := url.Location
 	converted := address
 	if len(address) != 0 {
-		reg := regexp.MustCompile("\\s+")
-		address = reg.ReplaceAllString(address, "")
+		address := regexp.MustCompile(`\s+`).ReplaceAllString(address, "")
 		parts := strings.Split(address, ",")
 		addrs := make([]string, 0)
 		for _, part := range parts {
diff --git a/config_center/apollo/impl_test.go b/config_center/apollo/impl_test.go
index 38ef0082fda5e741f091110bf3a09a4bcf6c0ff1..3b2cb168402534c1a8071e644827a0f948282f75 100644
--- a/config_center/apollo/impl_test.go
+++ b/config_center/apollo/impl_test.go
@@ -143,7 +143,7 @@ func serviceConfigResponse(rw http.ResponseWriter, _ *http.Request) {
 // run mock config server
 func runMockConfigServer(handlerMap map[string]func(http.ResponseWriter, *http.Request),
 	notifyHandler func(http.ResponseWriter, *http.Request)) *httptest.Server {
-	uriHandlerMap := make(map[string]func(http.ResponseWriter, *http.Request), 0)
+	uriHandlerMap := make(map[string]func(http.ResponseWriter, *http.Request))
 	for namespace, handler := range handlerMap {
 		uri := fmt.Sprintf("/configs/%s/%s/%s", mockAppId, mockCluster, namespace)
 		uriHandlerMap[uri] = handler
diff --git a/config_center/nacos/client.go b/config_center/nacos/client.go
index c7d631c76fec07820d72a1f4065e51a018af0d29..1e96b36a4f19b8548d2ffc9818251ebfa96f365b 100644
--- a/config_center/nacos/client.go
+++ b/config_center/nacos/client.go
@@ -65,7 +65,7 @@ type option func(*options)
 
 type options struct {
 	nacosName string
-	client    *NacosClient
+	//client    *NacosClient
 }
 
 // WithNacosName Set nacos name
diff --git a/config_center/nacos/impl_test.go b/config_center/nacos/impl_test.go
index 89917d14c2ed974c314c1d8a990fe2ac34a3fb0b..b7bd94bf96bfdafed1591e58f338fa23a0b96a6f 100644
--- a/config_center/nacos/impl_test.go
+++ b/config_center/nacos/impl_test.go
@@ -40,7 +40,7 @@ import (
 // run mock config server
 func runMockConfigServer(configHandler func(http.ResponseWriter, *http.Request),
 	configListenHandler func(http.ResponseWriter, *http.Request)) *httptest.Server {
-	uriHandlerMap := make(map[string]func(http.ResponseWriter, *http.Request), 0)
+	uriHandlerMap := make(map[string]func(http.ResponseWriter, *http.Request))
 
 	uriHandlerMap["/nacos/v1/cs/configs"] = configHandler
 	uriHandlerMap["/nacos/v1/cs/configs/listener"] = configListenHandler
diff --git a/config_center/zookeeper/impl.go b/config_center/zookeeper/impl.go
index 17812e917f533d28c052c7cda3411de44b9aa7b5..f3b2235025c033cd125c9a87b2c277a5a3d70243 100644
--- a/config_center/zookeeper/impl.go
+++ b/config_center/zookeeper/impl.go
@@ -52,7 +52,7 @@ type zookeeperDynamicConfiguration struct {
 	done     chan struct{}
 	client   *zookeeper.ZookeeperClient
 
-	listenerLock  sync.Mutex
+	//listenerLock  sync.Mutex
 	listener      *zookeeper.ZkEventListener
 	cacheListener *CacheListener
 	parser        parser.ConfigurationParser
diff --git a/filter/filter_impl/active_filter_test.go b/filter/filter_impl/active_filter_test.go
index 9f024fec34521b8445fa1a61295e4b3c0eb85e34..2397503dc8f46381a131bed6f924d465a71a9193 100644
--- a/filter/filter_impl/active_filter_test.go
+++ b/filter/filter_impl/active_filter_test.go
@@ -37,7 +37,7 @@ import (
 )
 
 func TestActiveFilterInvoke(t *testing.T) {
-	invoc := invocation.NewRPCInvocation("test", []interface{}{"OK"}, make(map[string]interface{}, 0))
+	invoc := invocation.NewRPCInvocation("test", []interface{}{"OK"}, make(map[string]interface{}))
 	url, _ := common.NewURL("dubbo://192.168.10.10:20000/com.ikurento.user.UserProvider")
 	filter := ActiveFilter{}
 	ctrl := gomock.NewController(t)
diff --git a/filter/filter_impl/auth/sign_util.go b/filter/filter_impl/auth/sign_util.go
index cb185376cb211fc415c6862c2aad19e5e3ba0cfa..4c12c762ed6715af551f6e37c251cf095bb43dc4 100644
--- a/filter/filter_impl/auth/sign_util.go
+++ b/filter/filter_impl/auth/sign_util.go
@@ -37,7 +37,7 @@ func Sign(metadata, key string) string {
 
 // SignWithParams returns a signature with giving params and metadata.
 func SignWithParams(params []interface{}, metadata, key string) (string, error) {
-	if params == nil || len(params) == 0 {
+	if len(params) == 0 {
 		return Sign(metadata, key), nil
 	}
 
diff --git a/filter/filter_impl/execute_limit_filter_test.go b/filter/filter_impl/execute_limit_filter_test.go
index 2aebcaa8fa62278da3092d6359d2a01571be37d0..682f8fa8b475348624a33d44d9a08190fe270fa8 100644
--- a/filter/filter_impl/execute_limit_filter_test.go
+++ b/filter/filter_impl/execute_limit_filter_test.go
@@ -36,7 +36,7 @@ import (
 
 func TestExecuteLimitFilterInvokeIgnored(t *testing.T) {
 	methodName := "hello"
-	invoc := invocation.NewRPCInvocation(methodName, []interface{}{"OK"}, make(map[string]interface{}, 0))
+	invoc := invocation.NewRPCInvocation(methodName, []interface{}{"OK"}, make(map[string]interface{}))
 
 	invokeUrl := common.NewURLWithOptions(
 		common.WithParams(url.Values{}),
@@ -51,7 +51,7 @@ func TestExecuteLimitFilterInvokeIgnored(t *testing.T) {
 
 func TestExecuteLimitFilterInvokeConfigureError(t *testing.T) {
 	methodName := "hello1"
-	invoc := invocation.NewRPCInvocation(methodName, []interface{}{"OK"}, make(map[string]interface{}, 0))
+	invoc := invocation.NewRPCInvocation(methodName, []interface{}{"OK"}, make(map[string]interface{}))
 
 	invokeUrl := common.NewURLWithOptions(
 		common.WithParams(url.Values{}),
@@ -68,7 +68,7 @@ func TestExecuteLimitFilterInvokeConfigureError(t *testing.T) {
 
 func TestExecuteLimitFilterInvoke(t *testing.T) {
 	methodName := "hello1"
-	invoc := invocation.NewRPCInvocation(methodName, []interface{}{"OK"}, make(map[string]interface{}, 0))
+	invoc := invocation.NewRPCInvocation(methodName, []interface{}{"OK"}, make(map[string]interface{}))
 
 	invokeUrl := common.NewURLWithOptions(
 		common.WithParams(url.Values{}),
diff --git a/filter/filter_impl/graceful_shutdown_filter_test.go b/filter/filter_impl/graceful_shutdown_filter_test.go
index c2c1ef874d1696217b34b50fbbf66aa8faf7803d..b16956e01c85b52ec0009f96998a72e2a4314911 100644
--- a/filter/filter_impl/graceful_shutdown_filter_test.go
+++ b/filter/filter_impl/graceful_shutdown_filter_test.go
@@ -39,10 +39,8 @@ import (
 )
 
 func TestGenericFilterInvoke(t *testing.T) {
-	invoc := invocation.NewRPCInvocation("GetUser", []interface{}{"OK"}, make(map[string]interface{}, 0))
-
-	invokeUrl := common.NewURLWithOptions(
-		common.WithParams(url.Values{}))
+	invoc := invocation.NewRPCInvocation("GetUser", []interface{}{"OK"}, make(map[string]interface{}))
+	invokeUrl := common.NewURLWithOptions(common.WithParams(url.Values{}))
 
 	shutdownFilter := extension.GetFilter(constant.PROVIDER_SHUTDOWN_FILTER).(*gracefulShutdownFilter)
 
diff --git a/filter/filter_impl/seata_filter.go b/filter/filter_impl/seata_filter.go
index 7722d2954f905ece4a1b48628c31c06debf45614..b7b7b0e94b4633dda10278e9674566a82701b7f6 100644
--- a/filter/filter_impl/seata_filter.go
+++ b/filter/filter_impl/seata_filter.go
@@ -23,6 +23,7 @@ import (
 )
 
 import (
+	"github.com/apache/dubbo-go/common/constant"
 	"github.com/apache/dubbo-go/common/extension"
 	"github.com/apache/dubbo-go/common/logger"
 	"github.com/apache/dubbo-go/filter"
@@ -30,12 +31,12 @@ import (
 )
 
 const (
-	SEATA     = "seata"
-	SEATA_XID = "SEATA_XID"
+	SEATA     = constant.DubboCtxKey("seata")
+	SEATA_XID = constant.DubboCtxKey("SEATA_XID")
 )
 
 func init() {
-	extension.SetFilter(SEATA, getSeataFilter)
+	extension.SetFilter(string(SEATA), getSeataFilter)
 }
 
 // SeataFilter when use seata-golang, use this filter to transfer xid
@@ -45,7 +46,7 @@ type SeataFilter struct{}
 // Invoke Get Xid by attachment key `SEATA_XID`
 func (sf *SeataFilter) Invoke(ctx context.Context, invoker protocol.Invoker, invocation protocol.Invocation) protocol.Result {
 	logger.Infof("invoking seata filter.")
-	xid := invocation.AttachmentsByKey(SEATA_XID, "")
+	xid := invocation.AttachmentsByKey(string(SEATA_XID), "")
 	if strings.TrimSpace(xid) != "" {
 		logger.Debugf("Method: %v,Xid: %v", invocation.MethodName(), xid)
 		return invoker.Invoke(context.WithValue(ctx, SEATA_XID, xid), invocation)
diff --git a/filter/filter_impl/seata_filter_test.go b/filter/filter_impl/seata_filter_test.go
index 45817e95cbd2eaa7365adc8a299523af8310f797..1705eba787f5569064841d6a713ed2f2e428314c 100644
--- a/filter/filter_impl/seata_filter_test.go
+++ b/filter/filter_impl/seata_filter_test.go
@@ -50,7 +50,7 @@ func TestSeataFilter_Invoke(t *testing.T) {
 	filter := getSeataFilter()
 	result := filter.Invoke(context.Background(), &testMockSeataInvoker{}, invocation.NewRPCInvocation("$echo",
 		[]interface{}{"OK"}, map[string]interface{}{
-			SEATA_XID: "10.30.21.227:8091:2000047792",
+			string(SEATA_XID): "10.30.21.227:8091:2000047792",
 		}))
 	assert.Equal(t, "10.30.21.227:8091:2000047792", result.Result())
 }
diff --git a/filter/filter_impl/sentinel_filter.go b/filter/filter_impl/sentinel_filter.go
index b5f8b45876717551cecd3639579a07a825a74d40..f662db35637593f4ab92a2b12e50d5a9e4305730 100644
--- a/filter/filter_impl/sentinel_filter.go
+++ b/filter/filter_impl/sentinel_filter.go
@@ -204,8 +204,8 @@ const (
 	DefaultProviderPrefix = "dubbo:provider:"
 	DefaultConsumerPrefix = "dubbo:consumer:"
 
-	MethodEntryKey    = "$$sentinelMethodEntry"
-	InterfaceEntryKey = "$$sentinelInterfaceEntry"
+	MethodEntryKey    = constant.DubboCtxKey("$$sentinelMethodEntry")
+	InterfaceEntryKey = constant.DubboCtxKey("$$sentinelInterfaceEntry")
 )
 
 func getResourceName(invoker protocol.Invoker, invocation protocol.Invocation, prefix string) (interfaceResourceName, methodResourceName string) {
diff --git a/filter/filter_impl/token_filter_test.go b/filter/filter_impl/token_filter_test.go
index 9ef8c98d6868c3d545fe963ab13eb3f27bb88cd0..024ae2ae3142b1e193d6a24001f51f00badf537a 100644
--- a/filter/filter_impl/token_filter_test.go
+++ b/filter/filter_impl/token_filter_test.go
@@ -40,7 +40,7 @@ func TestTokenFilterInvoke(t *testing.T) {
 	url := common.NewURLWithOptions(
 		common.WithParams(url.Values{}),
 		common.WithParamsValue(constant.TOKEN_KEY, "ori_key"))
-	attch := make(map[string]interface{}, 0)
+	attch := make(map[string]interface{})
 	attch[constant.TOKEN_KEY] = "ori_key"
 	result := filter.Invoke(context.Background(),
 		protocol.NewBaseInvoker(url),
@@ -54,7 +54,7 @@ func TestTokenFilterInvokeEmptyToken(t *testing.T) {
 	filter := GetTokenFilter()
 
 	testUrl := common.URL{}
-	attch := make(map[string]interface{}, 0)
+	attch := make(map[string]interface{})
 	attch[constant.TOKEN_KEY] = "ori_key"
 	result := filter.Invoke(context.Background(), protocol.NewBaseInvoker(&testUrl), invocation.NewRPCInvocation("MethodName", []interface{}{"OK"}, attch))
 	assert.Nil(t, result.Error())
@@ -67,7 +67,7 @@ func TestTokenFilterInvokeEmptyAttach(t *testing.T) {
 	testUrl := common.NewURLWithOptions(
 		common.WithParams(url.Values{}),
 		common.WithParamsValue(constant.TOKEN_KEY, "ori_key"))
-	attch := make(map[string]interface{}, 0)
+	attch := make(map[string]interface{})
 	result := filter.Invoke(context.Background(), protocol.NewBaseInvoker(testUrl), invocation.NewRPCInvocation("MethodName", []interface{}{"OK"}, attch))
 	assert.NotNil(t, result.Error())
 }
@@ -78,7 +78,7 @@ func TestTokenFilterInvokeNotEqual(t *testing.T) {
 	testUrl := common.NewURLWithOptions(
 		common.WithParams(url.Values{}),
 		common.WithParamsValue(constant.TOKEN_KEY, "ori_key"))
-	attch := make(map[string]interface{}, 0)
+	attch := make(map[string]interface{})
 	attch[constant.TOKEN_KEY] = "err_key"
 	result := filter.Invoke(context.Background(),
 		protocol.NewBaseInvoker(testUrl), invocation.NewRPCInvocation("MethodName", []interface{}{"OK"}, attch))
diff --git a/filter/filter_impl/tps/tps_limiter_method_service_test.go b/filter/filter_impl/tps/tps_limiter_method_service_test.go
index 7435d9b92ac8270de0244c8a257aec82f9acc9a1..a70287eabd8dc362c4f2acc970eb9eea32ed5e2a 100644
--- a/filter/filter_impl/tps/tps_limiter_method_service_test.go
+++ b/filter/filter_impl/tps/tps_limiter_method_service_test.go
@@ -36,7 +36,7 @@ import (
 
 func TestMethodServiceTpsLimiterImplIsAllowableOnlyServiceLevel(t *testing.T) {
 	methodName := "hello"
-	invoc := invocation.NewRPCInvocation(methodName, []interface{}{"OK"}, make(map[string]interface{}, 0))
+	invoc := invocation.NewRPCInvocation(methodName, []interface{}{"OK"}, make(map[string]interface{}))
 
 	ctrl := gomock.NewController(t)
 	defer ctrl.Finish()
@@ -63,7 +63,7 @@ func TestMethodServiceTpsLimiterImplIsAllowableOnlyServiceLevel(t *testing.T) {
 
 func TestMethodServiceTpsLimiterImplIsAllowableNoConfig(t *testing.T) {
 	methodName := "hello1"
-	invoc := invocation.NewRPCInvocation(methodName, []interface{}{"OK"}, make(map[string]interface{}, 0))
+	invoc := invocation.NewRPCInvocation(methodName, []interface{}{"OK"}, make(map[string]interface{}))
 	// ctrl := gomock.NewController(t)
 	// defer ctrl.Finish()
 
@@ -80,7 +80,7 @@ func TestMethodServiceTpsLimiterImplIsAllowableNoConfig(t *testing.T) {
 func TestMethodServiceTpsLimiterImplIsAllowableMethodLevelOverride(t *testing.T) {
 	methodName := "hello2"
 	methodConfigPrefix := "methods." + methodName + "."
-	invoc := invocation.NewRPCInvocation(methodName, []interface{}{"OK"}, make(map[string]interface{}, 0))
+	invoc := invocation.NewRPCInvocation(methodName, []interface{}{"OK"}, make(map[string]interface{}))
 	ctrl := gomock.NewController(t)
 	defer ctrl.Finish()
 
diff --git a/filter/filter_impl/tps_limit_filter_test.go b/filter/filter_impl/tps_limit_filter_test.go
index 88e778105081129463b68618804bd9204d2f7113..55a3a55fab28efc7c27d9f5ccc4a3ec454bb6d15 100644
--- a/filter/filter_impl/tps_limit_filter_test.go
+++ b/filter/filter_impl/tps_limit_filter_test.go
@@ -44,7 +44,7 @@ func TestTpsLimitFilterInvokeWithNoTpsLimiter(t *testing.T) {
 	invokeUrl := common.NewURLWithOptions(
 		common.WithParams(url.Values{}),
 		common.WithParamsValue(constant.TPS_LIMITER_KEY, ""))
-	attch := make(map[string]interface{}, 0)
+	attch := make(map[string]interface{})
 
 	result := tpsFilter.Invoke(context.Background(),
 		protocol.NewBaseInvoker(invokeUrl),
@@ -68,7 +68,7 @@ func TestGenericFilterInvokeWithDefaultTpsLimiter(t *testing.T) {
 	invokeUrl := common.NewURLWithOptions(
 		common.WithParams(url.Values{}),
 		common.WithParamsValue(constant.TPS_LIMITER_KEY, constant.DEFAULT_KEY))
-	attch := make(map[string]interface{}, 0)
+	attch := make(map[string]interface{})
 
 	result := tpsFilter.Invoke(context.Background(),
 		protocol.NewBaseInvoker(invokeUrl),
@@ -99,7 +99,7 @@ func TestGenericFilterInvokeWithDefaultTpsLimiterNotAllow(t *testing.T) {
 	invokeUrl := common.NewURLWithOptions(
 		common.WithParams(url.Values{}),
 		common.WithParamsValue(constant.TPS_LIMITER_KEY, constant.DEFAULT_KEY))
-	attch := make(map[string]interface{}, 0)
+	attch := make(map[string]interface{})
 
 	result := tpsFilter.Invoke(context.Background(),
 		protocol.NewBaseInvoker(
diff --git a/filter/filter_impl/tracing_filter_test.go b/filter/filter_impl/tracing_filter_test.go
index e159b7400d46069018a00a849319423285072dc2..bf96a7d064b3919825d26c505b637f5ea539d9d6 100644
--- a/filter/filter_impl/tracing_filter_test.go
+++ b/filter/filter_impl/tracing_filter_test.go
@@ -57,6 +57,6 @@ func TestTracingFilterInvoke(t *testing.T) {
 	tf.Invoke(ctx, invoker, inv)
 
 	// has remote ctx
-	ctx = context.WithValue(context.Background(), constant.TRACING_REMOTE_SPAN_CTX, span.Context())
+	ctx = context.WithValue(context.Background(), constant.DubboCtxKey(constant.TRACING_REMOTE_SPAN_CTX), span.Context())
 	tf.Invoke(ctx, invoker, inv)
 }
diff --git a/metadata/mapping/dynamic/service_name_mapping_test.go b/metadata/mapping/dynamic/service_name_mapping_test.go
index 2896b0fd4aa4fb6bada132c276c70a1653e59f99..af21704b69c674a2cd1b8963bb252ac73c0abf1e 100644
--- a/metadata/mapping/dynamic/service_name_mapping_test.go
+++ b/metadata/mapping/dynamic/service_name_mapping_test.go
@@ -39,6 +39,7 @@ func TestDynamicConfigurationServiceNameMapping(t *testing.T) {
 	dc, err := (&config_center.MockDynamicConfigurationFactory{
 		Content: appName,
 	}).GetDynamicConfiguration(nil)
+	assert.NoError(t, err)
 	config.GetApplicationConfig().Name = appName
 
 	mapping := &DynamicConfigurationServiceNameMapping{dc: dc}
diff --git a/metadata/report/delegate/delegate_report_test.go b/metadata/report/delegate/delegate_report_test.go
index 9c30ed9ffdb8424be38d273fd0a78f3351d6e0d5..f60acf6e117c866cba716c538806f278d77363f0 100644
--- a/metadata/report/delegate/delegate_report_test.go
+++ b/metadata/report/delegate/delegate_report_test.go
@@ -46,13 +46,10 @@ func TestMetadataReport_MetadataReportRetry(t *testing.T) {
 	})
 	assert.NoError(t, err)
 	retry.startRetryTask()
-	itsTime := time.After(2500 * time.Millisecond)
-	select {
-	case <-itsTime:
-		retry.scheduler.Clear()
-		assert.Equal(t, counter.Load(), int64(3))
-		logger.Info("over")
-	}
+	<-time.After(2500 * time.Millisecond)
+	retry.scheduler.Clear()
+	assert.Equal(t, counter.Load(), int64(3))
+	logger.Info("over")
 }
 
 func TestMetadataReport_MetadataReportRetryWithLimit(t *testing.T) {
@@ -64,13 +61,10 @@ func TestMetadataReport_MetadataReportRetryWithLimit(t *testing.T) {
 	})
 	assert.NoError(t, err)
 	retry.startRetryTask()
-	itsTime := time.After(2500 * time.Millisecond)
-	select {
-	case <-itsTime:
-		retry.scheduler.Clear()
-		assert.Equal(t, counter.Load(), int64(2))
-		logger.Info("over")
-	}
+	<-time.After(2500 * time.Millisecond)
+	retry.scheduler.Clear()
+	assert.Equal(t, counter.Load(), int64(2))
+	logger.Info("over")
 }
 
 func mockNewMetadataReport(t *testing.T) *MetadataReport {
diff --git a/metadata/service/inmemory/service_proxy.go b/metadata/service/inmemory/service_proxy.go
index 7e14293a6766492c1c1b02eef9429d1adeb539ae..8b93aab9accfd8375ded971c27f898069e73e231 100644
--- a/metadata/service/inmemory/service_proxy.go
+++ b/metadata/service/inmemory/service_proxy.go
@@ -39,8 +39,8 @@ import (
 // this is the stub, or proxy
 // for now, only GetExportedURLs need to be implemented
 type MetadataServiceProxy struct {
-	invkr        protocol.Invoker
-	golangServer bool
+	invkr protocol.Invoker
+	//golangServer bool
 }
 
 func (m *MetadataServiceProxy) GetExportedURLs(serviceInterface string, group string, version string, protocol string) ([]interface{}, error) {
@@ -67,11 +67,7 @@ func (m *MetadataServiceProxy) GetExportedURLs(serviceInterface string, group st
 	urlStrs := res.Result().(*[]interface{})
 
 	ret := make([]interface{}, 0, len(*urlStrs))
-
-	for _, s := range *urlStrs {
-		ret = append(ret, s)
-	}
-	return ret, nil
+	return append(ret, *urlStrs...), nil
 }
 
 func (m *MetadataServiceProxy) MethodMapper() map[string]string {
diff --git a/metadata/service/remote/service.go b/metadata/service/remote/service.go
index ae1c344d27a0c5be08739ab05f0c909bcc2b8fdb..d21cc88a3d31ec2920a78c608ed13a491fd6c634 100644
--- a/metadata/service/remote/service.go
+++ b/metadata/service/remote/service.go
@@ -188,7 +188,7 @@ func (mts *MetadataService) RefreshMetadata(exportedRevision string, subscribedR
 			logger.Errorf("Error occur when execute remote.MetadataService.RefreshMetadata, error message is %v+", err)
 			return false, err
 		}
-		if urls != nil && len(urls) > 0 {
+		if len(urls) > 0 {
 			id := &identifier.SubscriberMetadataIdentifier{
 				MetadataIdentifier: identifier.MetadataIdentifier{
 					Application: config.GetApplicationConfig().Name,
diff --git a/metadata/service/remote/service_proxy.go b/metadata/service/remote/service_proxy.go
index 3199aa6dfff6f5e8b6036c44f452d16480b0380c..d0caa182b2efdc709af11e4bc40f807e89276a56 100644
--- a/metadata/service/remote/service_proxy.go
+++ b/metadata/service/remote/service_proxy.go
@@ -146,7 +146,7 @@ func newMetadataServiceProxy(ins registry.ServiceInstance) service.MetadataServi
 }
 
 func parse(key string) []string {
-	arr := make([]string, 3, 3)
+	arr := make([]string, 3)
 	tmp := strings.SplitN(key, "/", 2)
 	if len(tmp) > 1 {
 		arr[0] = tmp[0]
diff --git a/metadata/service/remote/service_test.go b/metadata/service/remote/service_test.go
index 71586cc1dcc87dc8644a25c9a89842bd84fe9f0a..d6028152ccb275238491accc055e67d0b903bc55 100644
--- a/metadata/service/remote/service_test.go
+++ b/metadata/service/remote/service_test.go
@@ -95,7 +95,7 @@ func (metadataReport) GetServiceDefinition(*identifier.MetadataIdentifier) (stri
 
 func TestMetadataService(t *testing.T) {
 	extension.SetMetadataReportFactory("mock", getMetadataReportFactory)
-	u, err := common.NewURL(fmt.Sprintf("mock://127.0.0.1:20000/?sync.report=true"))
+	u, err := common.NewURL("mock://127.0.0.1:20000/?sync.report=true")
 	assert.NoError(t, err)
 	instance.GetMetadataReportInstance(u)
 	mts, err := newMetadataService()
diff --git a/protocol/dubbo/dubbo_codec.go b/protocol/dubbo/dubbo_codec.go
index ccecbee2e2b04083cbda3118978da0f7450b4d3f..f92da4aa7f164fce131f9f869f9550b6e7168943 100644
--- a/protocol/dubbo/dubbo_codec.go
+++ b/protocol/dubbo/dubbo_codec.go
@@ -177,10 +177,7 @@ func (c *DubboCodec) Decode(data []byte) (remoting.DecodeResult, int, error) {
 }
 
 func (c *DubboCodec) isRequest(data []byte) bool {
-	if data[2]&byte(0x80) == 0x00 {
-		return false
-	}
-	return true
+	return data[2]&byte(0x80) != 0x00
 }
 
 // decode request
diff --git a/protocol/dubbo/dubbo_invoker_test.go b/protocol/dubbo/dubbo_invoker_test.go
index c7a9a2697529d096e57585347b0a8b0a535451b0..fecb3b01ab286d4900cba4628cb80ea6d9920a9a 100644
--- a/protocol/dubbo/dubbo_invoker_test.go
+++ b/protocol/dubbo/dubbo_invoker_test.go
@@ -169,7 +169,7 @@ type (
 	}
 
 	UserProvider struct {
-		user map[string]User
+		//user map[string]User
 	}
 )
 
diff --git a/protocol/dubbo/dubbo_protocol.go b/protocol/dubbo/dubbo_protocol.go
index 4f03b8aba061ea9b37b35d89142eb7bec80f3a97..1f7cd50187d14252ec7e4b2f5c78e8b5bd9228e2 100644
--- a/protocol/dubbo/dubbo_protocol.go
+++ b/protocol/dubbo/dubbo_protocol.go
@@ -222,13 +222,13 @@ func getExchangeClient(url *common.URL) *remoting.ExchangeClient {
 // Once we decided to transfer more context's key-value, we should change this.
 // now we only support rebuild the tracing context
 func rebuildCtx(inv *invocation.RPCInvocation) context.Context {
-	ctx := context.WithValue(context.Background(), "attachment", inv.Attachments())
+	ctx := context.WithValue(context.Background(), constant.DubboCtxKey("attachment"), inv.Attachments())
 
 	// actually, if user do not use any opentracing framework, the err will not be nil.
 	spanCtx, err := opentracing.GlobalTracer().Extract(opentracing.TextMap,
 		opentracing.TextMapCarrier(filterContext(inv.Attachments())))
 	if err == nil {
-		ctx = context.WithValue(ctx, constant.TRACING_REMOTE_SPAN_CTX, spanCtx)
+		ctx = context.WithValue(ctx, constant.DubboCtxKey(constant.TRACING_REMOTE_SPAN_CTX), spanCtx)
 	}
 	return ctx
 }
diff --git a/protocol/dubbo/hessian2/hessian_request.go b/protocol/dubbo/hessian2/hessian_request.go
index 586476fdc6efe07a29185fc219ba1b4efc64c4c0..efcbd95d293fa84e8dfd6eddd9fdc14f05c3e6a2 100644
--- a/protocol/dubbo/hessian2/hessian_request.go
+++ b/protocol/dubbo/hessian2/hessian_request.go
@@ -43,7 +43,7 @@ func getArgType(v interface{}) string {
 		return "V"
 	}
 
-	switch v.(type) {
+	switch v := v.(type) {
 	// Serialized tags for base types
 	case nil:
 		return "V"
diff --git a/protocol/dubbo/impl/hessian.go b/protocol/dubbo/impl/hessian.go
index c4efb97e4b75ea8e81218ceb8dfe4aa65c5d810b..e355276c37f9d1babc12f7e3b694ec7a193aed80 100644
--- a/protocol/dubbo/impl/hessian.go
+++ b/protocol/dubbo/impl/hessian.go
@@ -417,7 +417,7 @@ func getArgType(v interface{}) string {
 		return "V"
 	}
 
-	switch v.(type) {
+	switch v := v.(type) {
 	// Serialized tags for base types
 	case nil:
 		return "V"
diff --git a/protocol/grpc/protoc-gen-dubbo/plugin/dubbo/dubbo.go b/protocol/grpc/protoc-gen-dubbo/plugin/dubbo/dubbo.go
index 78847282d5ff6c36a4fc15dee1f7bf16e8e9b8b3..ba84f36b74016f1495fa7d616315deda7c54bbcc 100644
--- a/protocol/grpc/protoc-gen-dubbo/plugin/dubbo/dubbo.go
+++ b/protocol/grpc/protoc-gen-dubbo/plugin/dubbo/dubbo.go
@@ -254,8 +254,8 @@ func (g *dubboGrpc) generateClientSignature(servName string, method *pb.MethodDe
 	return fmt.Sprintf("%s func(ctx %s.Context%s, %s) error", methName, contextPkg, reqArg, respName)
 }
 
-func (g *dubboGrpc) generateClientMethod(servName, fullServName, serviceDescVar string, method *pb.MethodDescriptorProto, descExpr string) {
-}
+//func (g *dubboGrpc) generateClientMethod(servName, fullServName, serviceDescVar string, method *pb.MethodDescriptorProto, descExpr string) {
+//}
 
 func (g *dubboGrpc) generateServerMethod(servName, fullServName string, method *pb.MethodDescriptorProto) string {
 	methName := generator.CamelCase(method.GetName())
diff --git a/protocol/jsonrpc/http.go b/protocol/jsonrpc/http.go
index 7ab1a8942da62deba17df991c019fc4f71a69366..037744cf09c4aa229fd7d5f0a7444fd86e70f06f 100644
--- a/protocol/jsonrpc/http.go
+++ b/protocol/jsonrpc/http.go
@@ -49,14 +49,14 @@ import (
 
 // Request is HTTP protocol request
 type Request struct {
-	ID          int64
-	group       string
-	protocol    string
-	version     string
-	service     string
-	method      string
-	args        interface{}
-	contentType string
+	ID       int64
+	group    string
+	protocol string
+	version  string
+	service  string
+	method   string
+	args     interface{}
+	//contentType string
 }
 
 // ////////////////////////////////////////////
diff --git a/protocol/jsonrpc/http_test.go b/protocol/jsonrpc/http_test.go
index c4801c8db883353c82762162a7b658f964fc6ffa..5ef40649b1fcb209f29d9bbe871e47b1fcda8a59 100644
--- a/protocol/jsonrpc/http_test.go
+++ b/protocol/jsonrpc/http_test.go
@@ -44,7 +44,7 @@ type (
 	}
 
 	UserProvider struct {
-		user map[string]User
+		//user map[string]User
 	}
 )
 
diff --git a/protocol/protocolwrapper/mock_protocol_filter.go b/protocol/protocolwrapper/mock_protocol_filter.go
index 18a4e1562107939e9c72090778422e0d8bb56a60..d1baba813416ff688c5f9ccccf05e276c55c2bba 100644
--- a/protocol/protocolwrapper/mock_protocol_filter.go
+++ b/protocol/protocolwrapper/mock_protocol_filter.go
@@ -45,5 +45,4 @@ func (pfw *mockProtocolFilter) Refer(url *common.URL) protocol.Invoker {
 
 // Destroy will do nothing
 func (pfw *mockProtocolFilter) Destroy() {
-	return
 }
diff --git a/registry/base_registry.go b/registry/base_registry.go
index ee0d340387a0d270d8254f5038db312977f1f001..e97cc1a4ed6c85fa464d3398b4706e99f7a7f535 100644
--- a/registry/base_registry.go
+++ b/registry/base_registry.go
@@ -18,7 +18,6 @@
 package registry
 
 import (
-	"context"
 	"fmt"
 	"net/url"
 	"os"
@@ -93,7 +92,7 @@ type FacadeBasedRegistry interface {
 
 // BaseRegistry is a common logic abstract for registry. It implement Registry interface.
 type BaseRegistry struct {
-	context             context.Context
+	//context             context.Context
 	facadeBasedRegistry FacadeBasedRegistry
 	*common.URL
 	birth    int64          // time of file birth, seconds since Epoch; 0 if unknown
diff --git a/registry/consul/service_discovery.go b/registry/consul/service_discovery.go
index a64fabb1b9edc9cd196c4d25f6659c499bca064b..6674909b15afc225515ff080fb341da65c17a05f 100644
--- a/registry/consul/service_discovery.go
+++ b/registry/consul/service_discovery.go
@@ -252,7 +252,7 @@ func (csd *consulServiceDiscovery) GetServices() *gxset.HashSet {
 		return res
 	}
 
-	for service, _ := range services {
+	for service := range services {
 		res.Add(service)
 	}
 	return res
diff --git a/registry/consul/service_discovery_test.go b/registry/consul/service_discovery_test.go
index 348790cb120e63ce496d88e472269b390e5c46a7..3f97d841d56111746f396ba753142324ac4555d2 100644
--- a/registry/consul/service_discovery_test.go
+++ b/registry/consul/service_discovery_test.go
@@ -141,7 +141,8 @@ func TestConsulServiceDiscovery_CRUD(t *testing.T) {
 	assert.Equal(t, 1, len(page.GetData()))
 
 	instanceResult = page.GetData()[0].(*registry.DefaultServiceInstance)
-	v, _ := instanceResult.Metadata["aaa"]
+	v, ok := instanceResult.Metadata["aaa"]
+	assert.True(t, ok)
 	assert.Equal(t, "bbb", v)
 
 	// test dispatcher event
diff --git a/registry/directory/directory.go b/registry/directory/directory.go
index f55bd4abfdcd764cf908cae92564ca1d61229331..1b607351af0b527f9ace4fa77268e100aa8fa2dc 100644
--- a/registry/directory/directory.go
+++ b/registry/directory/directory.go
@@ -26,7 +26,6 @@ import (
 
 import (
 	perrors "github.com/pkg/errors"
-	"go.uber.org/atomic"
 )
 
 import (
@@ -64,9 +63,9 @@ type RegistryDirectory struct {
 	configurators                  []config_center.Configurator
 	consumerConfigurationListener  *consumerConfigurationListener
 	referenceConfigurationListener *referenceConfigurationListener
-	serviceKey                     string
-	forbidden                      atomic.Bool
-	registerLock                   sync.Mutex // this lock if for register
+	//serviceKey                     string
+	//forbidden                      atomic.Bool
+	registerLock sync.Mutex // this lock if for register
 }
 
 // NewRegistryDirectory will create a new RegistryDirectory
@@ -154,7 +153,6 @@ func (dir *RegistryDirectory) refreshAllInvokers(events []*registry.ServiceEvent
 		if event.Action != remoting.EventTypeUpdate {
 			panic("Your implements of register center is wrong, " +
 				"please check the Action of ServiceEvent should be EventTypeUpdate")
-			return
 		}
 		// Originally it will Merge URL many times, now we just execute once.
 		// MergeUrl is executed once and put the result into Event. After this, the key will get from Event.Key().
@@ -297,11 +295,7 @@ func (dir *RegistryDirectory) toGroupInvokers() []protocol.Invoker {
 	for _, invoker := range newInvokersList {
 		group := invoker.GetUrl().GetParam(constant.GROUP_KEY, "")
 
-		if _, ok := groupInvokersMap[group]; ok {
-			groupInvokersMap[group] = append(groupInvokersMap[group], invoker)
-		} else {
-			groupInvokersMap[group] = []protocol.Invoker{invoker}
-		}
+		groupInvokersMap[group] = append(groupInvokersMap[group], invoker)
 	}
 	groupInvokersList := make([]protocol.Invoker, 0, len(groupInvokersMap))
 	if len(groupInvokersMap) == 1 {
diff --git a/registry/etcdv3/service_discovery.go b/registry/etcdv3/service_discovery.go
index 4d5b8781b5a654632cb3416033eab9ed139cad0b..b9d8b5f895cf8257fa75da87c5548c7a8bdad3b9 100644
--- a/registry/etcdv3/service_discovery.go
+++ b/registry/etcdv3/service_discovery.go
@@ -165,7 +165,7 @@ func (e *etcdV3ServiceDiscovery) GetInstances(serviceName string) []registry.Ser
 		logger.Infof("could not getChildrenKVList the err is:%v", err)
 	}
 
-	return make([]registry.ServiceInstance, 0, 0)
+	return make([]registry.ServiceInstance, 0)
 }
 
 // GetInstancesByPage will return a page containing instances of ServiceInstance with the serviceName
@@ -322,5 +322,5 @@ func newEtcdV3ServiceDiscovery(name string) (registry.ServiceDiscovery, error) {
 
 	descriptor := fmt.Sprintf("etcd-service-discovery[%s]", remoteConfig.Address)
 
-	return &etcdV3ServiceDiscovery{descriptor, client, nil, gxset.NewSet(), make(map[string]*etcdv3.EventListener, 0)}, nil
+	return &etcdV3ServiceDiscovery{descriptor, client, nil, gxset.NewSet(), make(map[string]*etcdv3.EventListener)}, nil
 }
diff --git a/registry/file/service_discovery.go b/registry/file/service_discovery.go
index d19d1f310ca94f66c3178b9733cc93836b6dae6e..21482d329e0e252a4af612e872c4153a5afdd25c 100644
--- a/registry/file/service_discovery.go
+++ b/registry/file/service_discovery.go
@@ -212,7 +212,7 @@ func (fssd *fileSystemServiceDiscovery) GetInstances(serviceName string) []regis
 	if err != nil {
 		logger.Errorf("[FileServiceDiscovery] Could not query the instances for service{%s}, error = err{%v} ",
 			serviceName, err)
-		return make([]registry.ServiceInstance, 0, 0)
+		return make([]registry.ServiceInstance, 0)
 	}
 
 	res := make([]registry.ServiceInstance, 0, set.Size())
@@ -223,7 +223,7 @@ func (fssd *fileSystemServiceDiscovery) GetInstances(serviceName string) []regis
 			logger.Errorf("[FileServiceDiscovery] Could not get the properties for id{%s}, service{%s}, "+
 				"error = err{%v} ",
 				id, serviceName, err)
-			return make([]registry.ServiceInstance, 0, 0)
+			return make([]registry.ServiceInstance, 0)
 		}
 
 		dsi := &registry.DefaultServiceInstance{}
@@ -232,7 +232,7 @@ func (fssd *fileSystemServiceDiscovery) GetInstances(serviceName string) []regis
 			logger.Errorf("[FileServiceDiscovery] Could not unmarshal the properties for id{%s}, service{%s}, "+
 				"error = err{%v} ",
 				id, serviceName, err)
-			return make([]registry.ServiceInstance, 0, 0)
+			return make([]registry.ServiceInstance, 0)
 		}
 
 		res = append(res, dsi)
diff --git a/registry/kubernetes/registry.go b/registry/kubernetes/registry.go
index c1e559e48dcc64972c9405e15405d7e6febcc845..55be4c392abcc14557c60af15b92bc84855b4b31 100644
--- a/registry/kubernetes/registry.go
+++ b/registry/kubernetes/registry.go
@@ -19,7 +19,6 @@ package kubernetes
 
 import (
 	"fmt"
-	"os"
 	"path"
 	"sync"
 	"time"
@@ -40,10 +39,10 @@ import (
 	"github.com/apache/dubbo-go/remoting/kubernetes"
 )
 
-var (
-	processID = ""
-	localIP   = ""
-)
+//var (
+//	processID = ""
+//	localIP   = ""
+//)
 
 const (
 	Name         = "kubernetes"
@@ -52,8 +51,8 @@ const (
 )
 
 func init() {
-	processID = fmt.Sprintf("%d", os.Getpid())
-	localIP = common.GetLocalIp()
+	//processID = fmt.Sprintf("%d", os.Getpid())
+	//localIP = common.GetLocalIp()
 	extension.SetRegistry(Name, newKubernetesRegistry)
 }
 
diff --git a/registry/mock_registry.go b/registry/mock_registry.go
index 7c269c3a4044079d19c7c41b53a9ae04b9eab86b..6287bb0d168f18f166618b7c6505b2f8b012be04 100644
--- a/registry/mock_registry.go
+++ b/registry/mock_registry.go
@@ -137,10 +137,7 @@ type listener struct {
 }
 
 func (l *listener) Next() (*ServiceEvent, error) {
-	select {
-	case e := <-l.listenChan:
-		return e, nil
-	}
+	return <-l.listenChan, nil
 }
 
 func (*listener) Close() {
diff --git a/registry/nacos/service_discovery.go b/registry/nacos/service_discovery.go
index b38e150e51075ce47ee38c9c8c9c7280e4437c53..9a2e1f11729d33e6b22bcd2514d97ac5adc29888 100644
--- a/registry/nacos/service_discovery.go
+++ b/registry/nacos/service_discovery.go
@@ -143,7 +143,7 @@ func (n *nacosServiceDiscovery) GetInstances(serviceName string) []registry.Serv
 	if err != nil {
 		logger.Errorf("Could not query the instances for service: %+v, group: %+v . It happened err %+v",
 			serviceName, n.group, err)
-		return make([]registry.ServiceInstance, 0, 0)
+		return make([]registry.ServiceInstance, 0)
 	}
 	res := make([]registry.ServiceInstance, 0, len(instances))
 	for _, ins := range instances {
diff --git a/registry/nacos/service_discovery_test.go b/registry/nacos/service_discovery_test.go
index 3b09136d2e273090bea339e0a15b25dde719b6ac..2af1d5b6f564b5389574cc9107ef912cd506db8a 100644
--- a/registry/nacos/service_discovery_test.go
+++ b/registry/nacos/service_discovery_test.go
@@ -151,7 +151,8 @@ func TestNacosServiceDiscovery_CRUD(t *testing.T) {
 	assert.Equal(t, 1, len(page.GetData()))
 
 	instance = page.GetData()[0].(*registry.DefaultServiceInstance)
-	v, _ := instance.Metadata["a"]
+	v, ok := instance.Metadata["a"]
+	assert.True(t, ok)
 	assert.Equal(t, "b", v)
 
 	// test dispatcher event
diff --git a/registry/service_instance.go b/registry/service_instance.go
index dbb458284d48aa350f2d5d3408b187b437ac81cd..43a1640eead7be1774556f25c9b8f97a75588801 100644
--- a/registry/service_instance.go
+++ b/registry/service_instance.go
@@ -91,7 +91,7 @@ func (d *DefaultServiceInstance) IsHealthy() bool {
 // GetMetadata will return the metadata, it will never return nil
 func (d *DefaultServiceInstance) GetMetadata() map[string]string {
 	if d.Metadata == nil {
-		d.Metadata = make(map[string]string, 0)
+		d.Metadata = make(map[string]string)
 	}
 	return d.Metadata
 }
diff --git a/registry/servicediscovery/service_discovery_registry.go b/registry/servicediscovery/service_discovery_registry.go
index ad6ec981ded9e224cecc0fa37c8e7f8c0254a932..2ca4b8015bc8dbc51a47a46c1bec0301ac961339 100644
--- a/registry/servicediscovery/service_discovery_registry.go
+++ b/registry/servicediscovery/service_discovery_registry.go
@@ -462,7 +462,7 @@ func (s *serviceDiscoveryRegistry) initRevisionExportedURLsByInst(serviceInstanc
 	}
 	revisionExportedURLs := revisionExportedURLsMap[revision]
 	firstGet := false
-	if revisionExportedURLs == nil || len(revisionExportedURLs) == 0 {
+	if len(revisionExportedURLs) == 0 {
 		if len(revisionExportedURLsMap) > 0 {
 			// The case is that current ServiceInstance with the different revision
 			logger.Warnf("The ServiceInstance[id: %s, host : %s , port : %s] has different revision : %s"+
diff --git a/registry/servicediscovery/synthesizer/rest/rest_subscribed_urls_synthesizer.go b/registry/servicediscovery/synthesizer/rest/rest_subscribed_urls_synthesizer.go
index d1ab6113b31a779529cc7e33ffd0f14233dd9ad6..c6b3aeaad09ebfa01d832a92478b7638a6cff432 100644
--- a/registry/servicediscovery/synthesizer/rest/rest_subscribed_urls_synthesizer.go
+++ b/registry/servicediscovery/synthesizer/rest/rest_subscribed_urls_synthesizer.go
@@ -38,14 +38,11 @@ type RestSubscribedURLsSynthesizer struct {
 }
 
 func (r RestSubscribedURLsSynthesizer) Support(subscribedURL *common.URL) bool {
-	if "rest" == subscribedURL.Protocol {
-		return true
-	}
-	return false
+	return "rest" == subscribedURL.Protocol
 }
 
 func (r RestSubscribedURLsSynthesizer) Synthesize(subscribedURL *common.URL, serviceInstances []registry.ServiceInstance) []*common.URL {
-	urls := make([]*common.URL, len(serviceInstances), len(serviceInstances))
+	urls := make([]*common.URL, len(serviceInstances))
 	for i, s := range serviceInstances {
 		splitHost := strings.Split(s.GetHost(), ":")
 		u := common.NewURLWithOptions(common.WithProtocol(subscribedURL.Protocol), common.WithIp(splitHost[0]),
diff --git a/registry/zookeeper/registry.go b/registry/zookeeper/registry.go
index fe492c2b12712e0935ccd6fdd264e0fe8f24e213..8b61e8092ce5b0d8081095555ed49734db9a48b4 100644
--- a/registry/zookeeper/registry.go
+++ b/registry/zookeeper/registry.go
@@ -129,7 +129,7 @@ func (r *zkRegistry) InitListeners() {
 		defer oldDataListener.mutex.Unlock()
 		r.dataListener.closed = true
 		recovered := r.dataListener.subscribed
-		if recovered != nil && len(recovered) > 0 {
+		if len(recovered) > 0 {
 			// recover all subscribed url
 			for _, oldListener := range recovered {
 				var (
diff --git a/registry/zookeeper/registry_test.go b/registry/zookeeper/registry_test.go
index 63f4b25025862ec620ab22eed6e7af026bd4d61b..5959a903bc883141f158c5462b0a775c711f8f51 100644
--- a/registry/zookeeper/registry_test.go
+++ b/registry/zookeeper/registry_test.go
@@ -57,11 +57,13 @@ func Test_UnRegister(t *testing.T) {
 		_ = ts.Stop()
 	}()
 	err := reg.Register(url)
+	assert.NoError(t, err)
 	children, _ := reg.client.GetChildren("/dubbo/com.ikurento.user.UserProvider/providers")
 	assert.Regexp(t, ".*dubbo%3A%2F%2F127.0.0.1%3A20000%2Fcom.ikurento.user.UserProvider%3Fanyhost%3Dtrue%26cluster%3Dmock%26.*.serviceid%3Dsoa.mock", children)
 	assert.NoError(t, err)
 
 	err = reg.UnRegister(url)
+	assert.NoError(t, err)
 	children, err = reg.client.GetChildren("/dubbo/com.ikurento.user.UserProvider/providers")
 	assert.Equal(t, 0, len(children))
 	assert.Error(t, err)
@@ -71,7 +73,6 @@ func Test_UnRegister(t *testing.T) {
 	children, _ = reg.client.GetChildren("/dubbo/com.ikurento.user.UserProvider/providers")
 	assert.Regexp(t, ".*dubbo%3A%2F%2F127.0.0.1%3A20000%2Fcom.ikurento.user.UserProvider%3Fanyhost%3Dtrue%26cluster%3Dmock%26.*.serviceid%3Dsoa.mock", children)
 	assert.NoError(t, err)
-
 }
 
 func Test_Subscribe(t *testing.T) {
diff --git a/registry/zookeeper/service_discovery.go b/registry/zookeeper/service_discovery.go
index 6d9582f33a7b2517c4edc96d00d00ad6b57a4835..a515e22d041859211a7a8dcb28bb94b32ed6ae42 100644
--- a/registry/zookeeper/service_discovery.go
+++ b/registry/zookeeper/service_discovery.go
@@ -60,9 +60,9 @@ func init() {
 }
 
 type zookeeperServiceDiscovery struct {
-	client      *zookeeper.ZookeeperClient
-	csd         *curator_discovery.ServiceDiscovery
-	listener    *zookeeper.ZkEventListener
+	client *zookeeper.ZookeeperClient
+	csd    *curator_discovery.ServiceDiscovery
+	//listener    *zookeeper.ZkEventListener
 	url         *common.URL
 	wg          sync.WaitGroup
 	cltLock     sync.Mutex
@@ -214,7 +214,7 @@ func (zksd *zookeeperServiceDiscovery) GetInstances(serviceName string) []regist
 	if err != nil {
 		logger.Errorf("[zkServiceDiscovery] Could not query the instances for service{%s}, error = err{%v} ",
 			serviceName, err)
-		return make([]registry.ServiceInstance, 0, 0)
+		return make([]registry.ServiceInstance, 0)
 	}
 	iss := make([]registry.ServiceInstance, 0, len(criss))
 	for _, cris := range criss {
diff --git a/registry/zookeeper/service_discovery_test.go b/registry/zookeeper/service_discovery_test.go
index 60b3d137591b4c1c0cc4420b11c5e50d80f0769b..b7d4677deb4efc56f1d246dc1eabdb0033c94702 100644
--- a/registry/zookeeper/service_discovery_test.go
+++ b/registry/zookeeper/service_discovery_test.go
@@ -75,7 +75,9 @@ func TestNewZookeeperServiceDiscovery(t *testing.T) {
 
 func TestCURDZookeeperServiceDiscovery(t *testing.T) {
 	ts := prepareData(t)
-	defer ts.Stop()
+	defer func() {
+		_ = ts.Stop()
+	}()
 	sd, err := newZookeeperServiceDiscovery(testName)
 	assert.Nil(t, err)
 	defer func() {
@@ -143,7 +145,9 @@ func TestCURDZookeeperServiceDiscovery(t *testing.T) {
 
 func TestAddListenerZookeeperServiceDiscovery(t *testing.T) {
 	ts := prepareData(t)
-	defer ts.Stop()
+	defer func() {
+		_ = ts.Stop()
+	}()
 	sd, err := newZookeeperServiceDiscovery(testName)
 	assert.Nil(t, err)
 	defer func() {
@@ -176,7 +180,7 @@ func TestAddListenerZookeeperServiceDiscovery(t *testing.T) {
 	extension.SetAndInitGlobalDispatcher("direct")
 	extension.GetGlobalDispatcher().AddEventListener(sicl)
 	err = sd.AddListener(sicl)
-	assert.Nil(t, err)
+	assert.NoError(t, err)
 
 	err = sd.Update(&registry.DefaultServiceInstance{
 		Id:          "testId",
@@ -187,6 +191,7 @@ func TestAddListenerZookeeperServiceDiscovery(t *testing.T) {
 		Healthy:     true,
 		Metadata:    nil,
 	})
+	assert.NoError(t, err)
 	tn.wg.Wait()
 }
 
diff --git a/remoting/etcdv3/client_test.go b/remoting/etcdv3/client_test.go
index 181f5c6c832e2189f6afef73e4d59e6309c769bd..787c24d45fba17584dbdd4cb6485cf31ad0e5d2c 100644
--- a/remoting/etcdv3/client_test.go
+++ b/remoting/etcdv3/client_test.go
@@ -108,7 +108,6 @@ func (suite *ClientTestSuite) SetupSuite() {
 	}
 
 	suite.etcd = e
-	return
 }
 
 // stop etcd server
@@ -136,7 +135,6 @@ func (suite *ClientTestSuite) SetupTest() {
 	err := c.CleanKV()
 	suite.Nil(err)
 	suite.client = c
-	return
 }
 
 func (suite *ClientTestSuite) TestClientClose() {
diff --git a/remoting/getty/dubbo_codec_for_test.go b/remoting/getty/dubbo_codec_for_test.go
index b33fb7422e6d0099d86cdf6410f4ea8daf626a0d..be6d9db07c681839485ddad65ce989d7235ec5af 100644
--- a/remoting/getty/dubbo_codec_for_test.go
+++ b/remoting/getty/dubbo_codec_for_test.go
@@ -171,10 +171,7 @@ func (c *DubboTestCodec) Decode(data []byte) (remoting.DecodeResult, int, error)
 }
 
 func (c *DubboTestCodec) isRequest(data []byte) bool {
-	if data[2]&byte(0x80) == 0x00 {
-		return false
-	}
-	return true
+	return data[2]&byte(0x80) != 0x00
 }
 
 // decode request
diff --git a/remoting/getty/getty_client_test.go b/remoting/getty/getty_client_test.go
index 982c509b322b3bdaf6ea1c27f67c32d4612cce27..c32e0c23f4b3705c3400a96a8bb1247c7e3eae40 100644
--- a/remoting/getty/getty_client_test.go
+++ b/remoting/getty/getty_client_test.go
@@ -396,6 +396,7 @@ func InitTest(t *testing.T) (*Server, *common.URL) {
 		"environment=dev&interface=com.ikurento.user.UserProvider&ip=127.0.0.1&methods=GetUser%2C&" +
 		"module=dubbogo+user-info+server&org=ikurento.com&owner=ZX&pid=1447&revision=0.0.1&" +
 		"side=provider&timeout=3000&timestamp=1556509797245&bean.name=UserProvider")
+	assert.NoError(t, err)
 	// init server
 	userProvider := &UserProvider{}
 	_, err = common.ServiceMap.Register("", url.Protocol, "", "0.0.1", userProvider)
@@ -432,7 +433,7 @@ type (
 	}
 
 	UserProvider struct {
-		user map[string]User
+		//user map[string]User
 	}
 )
 
diff --git a/remoting/getty/pool.go b/remoting/getty/pool.go
index c70aeea5160191a729d2ac3d91a177f299a5ba25..63c9c1a1fb4659ec2d4b07f14008acc99b9b9c3a 100644
--- a/remoting/getty/pool.go
+++ b/remoting/getty/pool.go
@@ -91,7 +91,7 @@ func newGettyRPCClientConn(pool *gettyRPCClientPool, addr string) (*gettyRPCClie
 			break
 		}
 
-		if time.Now().Sub(start) > connectTimeout {
+		if time.Since(start) > connectTimeout {
 			c.gettyClient.Close()
 			return nil, perrors.New(fmt.Sprintf("failed to create client connection to %s in %s", addr, connectTimeout))
 		}
@@ -292,11 +292,7 @@ func (c *gettyRPCClient) getClientRpcSession(session getty.Session) (rpcSession,
 }
 
 func (c *gettyRPCClient) isAvailable() bool {
-	if c.selectSession() == nil {
-		return false
-	}
-
-	return true
+	return c.selectSession() != nil
 }
 
 func (c *gettyRPCClient) close() error {
@@ -314,9 +310,7 @@ func (c *gettyRPCClient) close() error {
 			c.gettyClient = nil
 
 			sessions = make([]*rpcSession, 0, len(c.sessions))
-			for _, s := range c.sessions {
-				sessions = append(sessions, s)
-			}
+			sessions = append(sessions, c.sessions...)
 			c.sessions = c.sessions[:0]
 		}()
 
diff --git a/remoting/kubernetes/client.go b/remoting/kubernetes/client.go
index 5399e5f21b6acb70420bd054aa9b83a3d8ad98f0..ce6bcccea50643cd49f3f99fcf4b86e73309b28c 100644
--- a/remoting/kubernetes/client.go
+++ b/remoting/kubernetes/client.go
@@ -186,12 +186,12 @@ func ValidateClient(container clientFacade) error {
 
 // NewMockClient exports for registry package test
 func NewMockClient(podList *v1.PodList) (*Client, error) {
-
 	ctx, cancel := context.WithCancel(context.Background())
 	controller, err := newDubboRegistryController(ctx, common.CONSUMER, func() (kubernetes.Interface, error) {
 		return fake.NewSimpleClientset(podList), nil
 	})
 	if err != nil {
+		cancel()
 		return nil, perrors.WithMessage(err, "new dubbo-registry controller")
 	}
 
diff --git a/remoting/kubernetes/client_test.go b/remoting/kubernetes/client_test.go
index fdaee96b4451cba3fd6ba043be9d6b96feadf8c0..9cc421225ea15c250c3ea1196432cb65635144a2 100644
--- a/remoting/kubernetes/client_test.go
+++ b/remoting/kubernetes/client_test.go
@@ -317,7 +317,8 @@ func TestClientGetChildrenKVList(t *testing.T) {
 
 		wc, done, err := client.WatchWithPrefix(prefix)
 		if err != nil {
-			t.Fatal(err)
+			t.Error(err)
+			return
 		}
 
 		wg.Done()
diff --git a/remoting/kubernetes/facade_test.go b/remoting/kubernetes/facade_test.go
index 00e2e1171c54c2b07973b66cb96cf64e67683f00..a6c6c02b515b6e1ebc815bb5b388ae68db68621d 100644
--- a/remoting/kubernetes/facade_test.go
+++ b/remoting/kubernetes/facade_test.go
@@ -19,7 +19,6 @@ package kubernetes
 
 import (
 	"strconv"
-	"sync"
 	"testing"
 )
 
@@ -30,9 +29,9 @@ import (
 
 type mockFacade struct {
 	*common.URL
-	client  *Client
-	cltLock sync.Mutex
-	done    chan struct{}
+	client *Client
+	//cltLock sync.Mutex
+	//done    chan struct{}
 }
 
 func (r *mockFacade) Client() *Client {
diff --git a/remoting/kubernetes/watch.go b/remoting/kubernetes/watch.go
index 07eeb09b4dd4627fdd3b18ee4d59356911b3a9b1..7bb5ef1754836b481089d67b9cf34437567ffa9a 100644
--- a/remoting/kubernetes/watch.go
+++ b/remoting/kubernetes/watch.go
@@ -116,21 +116,17 @@ type watcherSetImpl struct {
 // closeWatchers
 // when the watcher-set was closed
 func (s *watcherSetImpl) closeWatchers() {
-
-	select {
-	case <-s.ctx.Done():
-
-		// parent ctx be canceled, close the watch-set's watchers
-		s.lock.Lock()
-		watchers := s.watchers
-		s.lock.Unlock()
-
-		for _, w := range watchers {
-			// stop data stream
-			// close(w.ch)
-			// stop watcher
-			w.stop()
-		}
+	<-s.ctx.Done()
+	// parent ctx be canceled, close the watch-set's watchers
+	s.lock.Lock()
+	watchers := s.watchers
+	s.lock.Unlock()
+
+	for _, w := range watchers {
+		// stop data stream
+		// close(w.ch)
+		// stop watcher
+		w.stop()
 	}
 }
 
diff --git a/remoting/kubernetes/watch_test.go b/remoting/kubernetes/watch_test.go
index 8889103be212381c07ffff3c3d4399f41aeee564..efefcc5dc9db629aa0f109a8da4f4227c18504fa 100644
--- a/remoting/kubernetes/watch_test.go
+++ b/remoting/kubernetes/watch_test.go
@@ -42,7 +42,8 @@ func TestWatchSet(t *testing.T) {
 			defer wg.Done()
 			w, err := s.Watch("key-1", false)
 			if err != nil {
-				t.Fatal(err)
+				t.Error(err)
+				return
 			}
 			for {
 				select {
@@ -64,7 +65,8 @@ func TestWatchSet(t *testing.T) {
 			defer wg.Done()
 			w, err := s.Watch("key", true)
 			if err != nil {
-				t.Fatal(err)
+				t.Error(err)
+				return
 			}
 
 			for {
@@ -86,7 +88,8 @@ func TestWatchSet(t *testing.T) {
 				Key:   "key-" + strconv.Itoa(i),
 				Value: strconv.Itoa(i),
 			}); err != nil {
-				t.Fatal(err)
+				t.Error(err)
+				return
 			}
 		}(i)
 	}
diff --git a/remoting/zookeeper/listener.go b/remoting/zookeeper/listener.go
index e5ddcadeaca9c3ce972cbe781413ebec7393afce..7b90e523364b6a1a77b8e30ef73ddca6caffda6a 100644
--- a/remoting/zookeeper/listener.go
+++ b/remoting/zookeeper/listener.go
@@ -362,9 +362,9 @@ func (l *ZkEventListener) ListenServiceEvent(conf *common.URL, zkPath string, li
 	}(zkPath, listener)
 }
 
-func (l *ZkEventListener) valid() bool {
-	return l.client.ZkConnValid()
-}
+//func (l *ZkEventListener) valid() bool {
+//	return l.client.ZkConnValid()
+//}
 
 // Close will let client listen exit
 func (l *ZkEventListener) Close() {