diff --git a/pkg/discoveryregistry/zookeeper/discover.go b/pkg/discoveryregistry/zookeeper/discover.go
index 1a5c29659..610c125e8 100644
--- a/pkg/discoveryregistry/zookeeper/discover.go
+++ b/pkg/discoveryregistry/zookeeper/discover.go
@@ -74,6 +74,7 @@ func (s *ZkClient) GetConnsRemote(serviceName string) (conns []resolver.Address,
 func (s *ZkClient) GetConns(ctx context.Context, serviceName string, opts ...grpc.DialOption) ([]*grpc.ClientConn, error) {
 	s.logger.Printf("get conns from client, serviceName: %s", serviceName)
 	s.lock.Lock()
+	defer s.lock.Unlock()
 	opts = append(s.options, opts...)
 	conns := s.localConns[serviceName]
 	if len(conns) == 0 {
@@ -81,12 +82,10 @@ func (s *ZkClient) GetConns(ctx context.Context, serviceName string, opts ...grp
 		s.logger.Printf("get conns from zk remote, serviceName: %s", serviceName)
 		conns, err = s.GetConnsRemote(serviceName)
 		if err != nil {
-			s.lock.Unlock()
 			return nil, err
 		}
 		s.localConns[serviceName] = conns
 	}
-	s.lock.Unlock()
 	var ret []*grpc.ClientConn
 	s.logger.Printf("get conns from zk success, serviceName: %s", serviceName)
 	for _, conn := range conns {
diff --git a/pkg/discoveryregistry/zookeeper/load_balancing.go b/pkg/discoveryregistry/zookeeper/load_balancing.go
deleted file mode 100644
index 2fee4aa66..000000000
--- a/pkg/discoveryregistry/zookeeper/load_balancing.go
+++ /dev/null
@@ -1,26 +0,0 @@
-package zookeeper
-
-import (
-	"sync"
-
-	"google.golang.org/grpc"
-)
-
-type RoundRobin struct {
-	index int
-	lock  sync.Mutex
-}
-
-func (r *RoundRobin) getConnBalance(conns []*grpc.ClientConn) (conn *grpc.ClientConn, err error) {
-	if len(conns) == 0 {
-		return nil, ErrConnIsNil
-	}
-	r.lock.Lock()
-	defer r.lock.Unlock()
-	if r.index < len(conns)-1 {
-		r.index++
-	} else {
-		r.index = 0
-	}
-	return conns[r.index], nil
-}
diff --git a/pkg/discoveryregistry/zookeeper/zk.go b/pkg/discoveryregistry/zookeeper/zk.go
index 0a665e5bf..1247dcc07 100644
--- a/pkg/discoveryregistry/zookeeper/zk.go
+++ b/pkg/discoveryregistry/zookeeper/zk.go
@@ -40,7 +40,6 @@ type ZkClient struct {
 	resolvers    map[string]*Resolver
 	localConns   map[string][]resolver.Address
 	balancerName string
-	RoundRobin
 
 	logger Logger
 }
@@ -154,6 +153,7 @@ func (s *ZkClient) refresh(wg *sync.WaitGroup) {
 }
 
 func (s *ZkClient) flushResolver(serviceName string) {
+	s.logger.Printf("start flush")
 	r, ok := s.resolvers[serviceName]
 	if ok {
 		r.ResolveNow(resolver.ResolveNowOptions{})