diff --git a/cmd/lbagent/main.go b/cmd/lbagent/main.go
index 9215a1ece1..1dce0f27f6 100644
--- a/cmd/lbagent/main.go
+++ b/cmd/lbagent/main.go
@@ -17,7 +17,7 @@ func main() {
 	consts.SetServiceType("lbagent")
 
 	opts := &lbagent.Options{}
-	commonOpts := &opts.CommonOpts
+	commonOpts := &opts.CommonOptions
 	{
 		cloudcommon.ParseOptions(opts, commonOpts, os.Args, "lbagent.conf")
 		cloudcommon.InitAuth(commonOpts, func() {
diff --git a/pkg/lbagent/api.go b/pkg/lbagent/api.go
index 38866f24a2..d55468c429 100644
--- a/pkg/lbagent/api.go
+++ b/pkg/lbagent/api.go
@@ -63,7 +63,7 @@ func (h *ApiHelper) Run(ctx context.Context) {
 }
 
 func (h *ApiHelper) adminClientSession(ctx context.Context) *mcclient.ClientSession {
-	region := h.opts.CommonOpts.Region
+	region := h.opts.CommonOptions.Region
 	apiVersion := "v2"
 	s := auth.GetAdminSession(ctx, region, apiVersion)
 	return s
diff --git a/pkg/lbagent/models/corpus.go b/pkg/lbagent/models/corpus.go
index b0c51f30e7..04f539ab03 100644
--- a/pkg/lbagent/models/corpus.go
+++ b/pkg/lbagent/models/corpus.go
@@ -1,6 +1,7 @@
 package models
 
 import (
+	"encoding/json"
 	"fmt"
 	"io/ioutil"
 	"path/filepath"
@@ -11,7 +12,12 @@ import (
 	"yunion.io/x/onecloud/pkg/mcclient"
 )
 
+const (
+	CORPUS_VERSION = "v1"
+)
+
 type LoadbalancerCorpus struct {
+	CorpusVersion string
 	*ModelSets
 	ModelSetsMaxUpdatedAt *ModelSetsMaxUpdatedAt
 }
@@ -50,10 +56,12 @@ func (b *LoadbalancerCorpus) MaxSeenUpdatedAtParams() *jsonutils.JSONDict {
 }
 
 func (b *LoadbalancerCorpus) SaveDir(dir string) error {
-	j := jsonutils.Marshal(b)
-	d := j.String()
+	d, err := json.Marshal(b)
+	if err != nil {
+		return err
+	}
 	p := filepath.Join(dir, "corpus")
-	err := ioutil.WriteFile(p, []byte(d), agentutils.FileModeFileSensitive)
+	err = ioutil.WriteFile(p, d, agentutils.FileModeFileSensitive)
 	return err
 }
 
@@ -63,13 +71,14 @@ func (b *LoadbalancerCorpus) LoadDir(dir string) error {
 	if err != nil {
 		return err
 	}
-	jd, err := jsonutils.Parse(d)
+	err = json.Unmarshal(d, b)
 	if err != nil {
-		return fmt.Errorf("%s: json parse failed: %s", p, err)
+		return err
 	}
-	err = jd.Unmarshal(b)
-	if err != nil {
-		return fmt.Errorf("%s: json unmarshal failed: %s", p, err)
+	// version for updating
+	if ver := b.CorpusVersion; ver != CORPUS_VERSION {
+		b.Reset()
+		return fmt.Errorf("%s: corpus version %s != %s", p, ver, CORPUS_VERSION)
 	}
 	correct := b.join()
 	if !correct {
@@ -77,3 +86,8 @@ func (b *LoadbalancerCorpus) LoadDir(dir string) error {
 	}
 	return nil
 }
+
+func (b *LoadbalancerCorpus) Reset() {
+	bb := NewEmptyLoadbalancerCorpus()
+	*b = *bb
+}
diff --git a/pkg/lbagent/models/modelset.go b/pkg/lbagent/models/modelset.go
index 5d86435713..0c94eb49a6 100644
--- a/pkg/lbagent/models/modelset.go
+++ b/pkg/lbagent/models/modelset.go
@@ -136,7 +136,7 @@ func (ms LoadbalancerListeners) JoinCertificates(subEntries LoadbalancerCertific
 		if m.CertificateId != "" {
 			subEntry, ok := subEntries[m.CertificateId]
 			if !ok {
-				log.Warningf("loadbalancer m id %s: cannot find certificate id %s",
+				log.Warningf("loadbalancerlistener id %s: cannot find certificate id %s",
 					m.Id, m.CertificateId)
 				correct = false
 				continue
diff --git a/pkg/lbagent/models/reflect.go b/pkg/lbagent/models/reflect.go
index 34af04a0f9..0d129638ea 100644
--- a/pkg/lbagent/models/reflect.go
+++ b/pkg/lbagent/models/reflect.go
@@ -90,7 +90,7 @@ func GetModels(opts *GetModelsOptions) error {
 		Details: options.Bool(true),
 		Filter: []string{
 			minUpdatedAtFilter(minUpdatedAt), // order matters, filter.0
-			"isempty(manager_id)",            // len(manager_id) > 0 is for pubcloud objects
+			"manager_id.isnull()",            // len(manager_id) > 0 is for pubcloud objects
 		},
 		OrderBy: []string{"updated_at", "id"},
 		Order:   "asc",
diff --git a/pkg/lbagent/options.go b/pkg/lbagent/options.go
index 11dae1370c..8ac80d5f8e 100644
--- a/pkg/lbagent/options.go
+++ b/pkg/lbagent/options.go
@@ -31,7 +31,7 @@ type LbagentOptions struct {
 }
 
 type Options struct {
-	CommonOpts cloudcommon.CommonOptions
+	cloudcommon.CommonOptions
 
 	LbagentOptions
 }