diff --git a/contrib/encoding/msgpack/go.sum b/contrib/encoding/msgpack/go.sum
index e0f307f8d..e96832c11 100644
--- a/contrib/encoding/msgpack/go.sum
+++ b/contrib/encoding/msgpack/go.sum
@@ -44,7 +44,6 @@ github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMyw
 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/go-cmp v0.5.6 h1:BKbKCqvP6I+rmFHt06ZmyQtvB8xAkWdhFyr0ZUNZcxQ=
 github.com/google/go-cmp v0.5.6/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/uuid v1.1.2/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
@@ -124,7 +123,6 @@ golang.org/x/tools v0.1.5/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
 google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
@@ -152,7 +150,6 @@ google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpAD
 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
 google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
-google.golang.org/protobuf v1.27.1 h1:SnqbnDw1V7RiZcXPx5MEeqPv2s79L9i7BJUlG/+RurQ=
 google.golang.org/protobuf v1.27.1/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
diff --git a/contrib/encoding/msgpack/msgpack.go b/contrib/encoding/msgpack/msgpack.go
index e4837dc18..4272b16b8 100644
--- a/contrib/encoding/msgpack/msgpack.go
+++ b/contrib/encoding/msgpack/msgpack.go
@@ -1,8 +1,9 @@
 package msgpack
 
 import (
-	"github.com/go-kratos/kratos/v2/encoding"
 	"github.com/vmihailenco/msgpack/v5"
+
+	"github.com/go-kratos/kratos/v2/encoding"
 )
 
 // Name is the name registered for the msgpack compressor.
diff --git a/contrib/registry/kubernetes/registry.go b/contrib/registry/kubernetes/registry.go
index f1e3b95ee..16adf0765 100644
--- a/contrib/registry/kubernetes/registry.go
+++ b/contrib/registry/kubernetes/registry.go
@@ -12,7 +12,6 @@ import (
 	"strings"
 	"time"
 
-	"github.com/go-kratos/kratos/v2/registry"
 	jsoniter "github.com/json-iterator/go"
 	corev1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -22,6 +21,8 @@ import (
 	"k8s.io/client-go/kubernetes"
 	listerv1 "k8s.io/client-go/listers/core/v1"
 	"k8s.io/client-go/tools/cache"
+
+	"github.com/go-kratos/kratos/v2/registry"
 )
 
 // Defines the key name of specific fields
@@ -166,7 +167,7 @@ func (s *Registry) Service(name string) ([]*registry.ServiceInstance, error) {
 	if err != nil {
 		return nil, err
 	}
-	var ret []*registry.ServiceInstance
+	ret := make([]*registry.ServiceInstance, 0, len(pods))
 	for _, pod := range pods {
 		if pod.Status.Phase != corev1.PodRunning {
 			continue
@@ -342,14 +343,14 @@ func getProtocolMapByEndpoints(endpoints []string) (protocolMap, error) {
 }
 
 func getProtocolMapFromPod(pod *corev1.Pod) (protocolMap, error) {
-	protocolMap := protocolMap{}
+	protoMap := protocolMap{}
 	if s := pod.Annotations[AnnotationsKeyProtocolMap]; !isEmptyObjectString(s) {
-		err := unmarshal(s, &protocolMap)
+		err := unmarshal(s, &protoMap)
 		if err != nil {
 			return nil, &ErrorHandleResource{Namespace: pod.Namespace, Name: pod.Name, Reason: err}
 		}
 	}
-	return protocolMap, nil
+	return protoMap, nil
 }
 
 func getMetadataFromPod(pod *corev1.Pod) (map[string]string, error) {
diff --git a/contrib/registry/nacos/registry.go b/contrib/registry/nacos/registry.go
index f36e4c2fc..56414ef70 100644
--- a/contrib/registry/nacos/registry.go
+++ b/contrib/registry/nacos/registry.go
@@ -7,9 +7,10 @@ import (
 	"net/url"
 	"strconv"
 
-	"github.com/go-kratos/kratos/v2/registry"
 	"github.com/nacos-group/nacos-sdk-go/clients/naming_client"
 	"github.com/nacos-group/nacos-sdk-go/vo"
+
+	"github.com/go-kratos/kratos/v2/registry"
 )
 
 var (
@@ -155,7 +156,7 @@ func (r *Registry) GetService(ctx context.Context, serviceName string) ([]*regis
 	if err != nil {
 		return nil, err
 	}
-	var items []*registry.ServiceInstance
+	items := make([]*registry.ServiceInstance, 0, len(res))
 	for _, in := range res {
 		items = append(items, &registry.ServiceInstance{
 			ID:        in.InstanceId,
diff --git a/contrib/registry/nacos/watcher.go b/contrib/registry/nacos/watcher.go
index 9696a864a..094505b18 100644
--- a/contrib/registry/nacos/watcher.go
+++ b/contrib/registry/nacos/watcher.go
@@ -4,16 +4,15 @@ import (
 	"context"
 	"fmt"
 
-	"github.com/go-kratos/kratos/v2/registry"
 	"github.com/nacos-group/nacos-sdk-go/clients/naming_client"
 	"github.com/nacos-group/nacos-sdk-go/model"
 	"github.com/nacos-group/nacos-sdk-go/vo"
-)
 
-var (
-	_ registry.Watcher = (*watcher)(nil)
+	"github.com/go-kratos/kratos/v2/registry"
 )
 
+var _ registry.Watcher = (*watcher)(nil)
+
 type watcher struct {
 	serviceName string
 	clusters    []string
@@ -46,36 +45,34 @@ func newWatcher(ctx context.Context, cli naming_client.INamingClient, serviceNam
 }
 
 func (w *watcher) Next() ([]*registry.ServiceInstance, error) {
-	for {
-		select {
-		case <-w.ctx.Done():
-			return nil, w.ctx.Err()
-		case <-w.watchChan:
-		}
-		res, err := w.cli.GetService(vo.GetServiceParam{
-			ServiceName: w.serviceName,
-			GroupName:   w.groupName,
-			Clusters:    w.clusters,
+	select {
+	case <-w.ctx.Done():
+		return nil, w.ctx.Err()
+	case <-w.watchChan:
+	}
+	res, err := w.cli.GetService(vo.GetServiceParam{
+		ServiceName: w.serviceName,
+		GroupName:   w.groupName,
+		Clusters:    w.clusters,
+	})
+	if err != nil {
+		return nil, err
+	}
+	items := make([]*registry.ServiceInstance, 0, len(res.Hosts))
+	for _, in := range res.Hosts {
+		items = append(items, &registry.ServiceInstance{
+			ID:        in.InstanceId,
+			Name:      res.Name,
+			Version:   in.Metadata["version"],
+			Metadata:  in.Metadata,
+			Endpoints: []string{fmt.Sprintf("%s://%s:%d", in.Metadata["kind"], in.Ip, in.Port)},
 		})
-		if err != nil {
-			return nil, err
-		}
-		var items []*registry.ServiceInstance
-		for _, in := range res.Hosts {
-			items = append(items, &registry.ServiceInstance{
-				ID:        in.InstanceId,
-				Name:      res.Name,
-				Version:   in.Metadata["version"],
-				Metadata:  in.Metadata,
-				Endpoints: []string{fmt.Sprintf("%s://%s:%d", in.Metadata["kind"], in.Ip, in.Port)},
-			})
-		}
-		return items, nil
 	}
+	return items, nil
 }
 
 func (w *watcher) Stop() error {
 	w.cancel()
-	//close
+	// close
 	return nil
 }
diff --git a/contrib/registry/zookeeper/register.go b/contrib/registry/zookeeper/register.go
index 22062bb0d..3f73e64f1 100644
--- a/contrib/registry/zookeeper/register.go
+++ b/contrib/registry/zookeeper/register.go
@@ -8,8 +8,9 @@ import (
 	"sync/atomic"
 	"time"
 
-	"github.com/go-kratos/kratos/v2/registry"
 	"github.com/go-zookeeper/zk"
+
+	"github.com/go-kratos/kratos/v2/registry"
 )
 
 var (
@@ -70,9 +71,11 @@ func New(zkServers []string, opts ...Option) (*Registry, error) {
 }
 
 func (r *Registry) Register(ctx context.Context, service *registry.ServiceInstance) error {
-	var data []byte
-	var err error
-	if err := r.ensureName(r.opts.rootPath, []byte("")); err != nil {
+	var (
+		data []byte
+		err  error
+	)
+	if err = r.ensureName(r.opts.rootPath, []byte("")); err != nil {
 		return err
 	}
 	serviceNamePath := path.Join(r.opts.rootPath, service.Name)
@@ -113,9 +116,9 @@ func (r *Registry) GetService(ctx context.Context, serviceName string) ([]*regis
 	if err != nil {
 		return nil, err
 	}
-	var items []*registry.ServiceInstance
+	items := make([]*registry.ServiceInstance, 0, len(servicesID))
 	for _, service := range servicesID {
-		var item = &registry.ServiceInstance{}
+		item := &registry.ServiceInstance{}
 		servicePath := path.Join(serviceNamePath, service)
 		serviceInstanceByte, _, err := r.conn.Get(servicePath)
 		if err != nil {
@@ -135,7 +138,7 @@ func (r *Registry) Watch(ctx context.Context, serviceName string) (registry.Watc
 	set, ok := r.registry[serviceName]
 	if !ok {
 		set = &serviceSet{
-			watcher:     make(map[*watcher]struct{}, 0),
+			watcher:     make(map[*watcher]struct{}),
 			services:    &atomic.Value{},
 			serviceName: serviceName,
 		}
diff --git a/contrib/registry/zookeeper/register_test.go b/contrib/registry/zookeeper/register_test.go
index 6e2f92c7b..f746b104a 100644
--- a/contrib/registry/zookeeper/register_test.go
+++ b/contrib/registry/zookeeper/register_test.go
@@ -22,11 +22,13 @@ func TestRegistry(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	defer w.Stop()
+	defer func() {
+		_ = w.Stop()
+	}()
 	go func() {
 		for {
-			res, err := w.Next()
-			if err != nil {
+			res, nextErr := w.Next()
+			if nextErr != nil {
 				return
 			}
 			t.Logf("watch: %d", len(res))
@@ -37,7 +39,7 @@ func TestRegistry(t *testing.T) {
 	}()
 	time.Sleep(time.Second)
 
-	if err := r.Register(ctx, s); err != nil {
+	if err = r.Register(ctx, s); err != nil {
 		t.Fatal(err)
 	}
 	time.Sleep(time.Second)
@@ -53,7 +55,7 @@ func TestRegistry(t *testing.T) {
 		t.Errorf("not expected: %+v", res)
 	}
 
-	if err := r.Deregister(ctx, s); err != nil {
+	if err = r.Deregister(ctx, s); err != nil {
 		t.Fatal(err)
 	}
 	time.Sleep(time.Second)
diff --git a/contrib/registry/zookeeper/watcher.go b/contrib/registry/zookeeper/watcher.go
index 9430e9ce3..c56f3d080 100644
--- a/contrib/registry/zookeeper/watcher.go
+++ b/contrib/registry/zookeeper/watcher.go
@@ -6,9 +6,7 @@ import (
 	"github.com/go-kratos/kratos/v2/registry"
 )
 
-var (
-	_ registry.Watcher = &watcher{}
-)
+var _ registry.Watcher = &watcher{}
 
 type watcher struct {
 	ctx    context.Context
@@ -25,9 +23,7 @@ func (w watcher) Next() (services []*registry.ServiceInstance, err error) {
 	}
 	ss, ok := w.set.services.Load().([]*registry.ServiceInstance)
 	if ok {
-		for _, s := range ss {
-			services = append(services, s)
-		}
+		services = append(services, ss...)
 	}
 	return
 }
diff --git a/examples/go.sum b/examples/go.sum
index a87f760e8..742d10b3e 100644
--- a/examples/go.sum
+++ b/examples/go.sum
@@ -748,7 +748,6 @@ golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzB
 golang.org/x/mod v0.1.1-0.20191107180719-034126e5016b/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
 golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
-golang.org/x/mod v0.4.2 h1:Gz96sIWK3OalVv/I/qNygP42zyoKp3xptRVCWRFEBvo=
 golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
diff --git a/hack/.lintcheck_failures b/hack/.lintcheck_failures
index 803889622..8b1378917 100644
--- a/hack/.lintcheck_failures
+++ b/hack/.lintcheck_failures
@@ -1,3 +1 @@
-./contrib/registry/nacos
-./contrib/registry/kubernetes
-./contrib/registry/zookeeper
+