diff --git a/internal/metastore/kv/rootcoord/kv_catalog.go b/internal/metastore/kv/rootcoord/kv_catalog.go
index 1ce56e4f0b995..781fe1b97a59c 100644
--- a/internal/metastore/kv/rootcoord/kv_catalog.go
+++ b/internal/metastore/kv/rootcoord/kv_catalog.go
@@ -314,7 +314,11 @@ func (kc *Catalog) GetCredential(ctx context.Context, username string) (*model.C
 	k := fmt.Sprintf("%s/%s", CredentialPrefix, username)
 	v, err := kc.Txn.Load(k)
 	if err != nil {
-		log.Warn("get credential meta fail", zap.String("key", k), zap.Error(err))
+		if common.IsKeyNotExistError(err) {
+			log.Debug("not found the user", zap.String("key", k))
+		} else {
+			log.Warn("get credential meta fail", zap.String("key", k), zap.Error(err))
+		}
 		return nil, err
 	}
 
@@ -609,6 +613,7 @@ func (kc *Catalog) save(k string) error {
 		return err
 	}
 	if err == nil {
+		log.Debug("the key has existed", zap.String("key", k))
 		return common.NewIgnorableError(fmt.Errorf("the key[%s] is existed", k))
 	}
 	return kc.Txn.Save(k, "")
@@ -628,7 +633,7 @@ func (kc *Catalog) remove(k string) error {
 func (kc *Catalog) CreateRole(ctx context.Context, tenant string, entity *milvuspb.RoleEntity) error {
 	k := funcutil.HandleTenantForEtcdKey(RolePrefix, tenant, entity.Name)
 	err := kc.save(k)
-	if err != nil {
+	if err != nil && !common.IsIgnorableError(err) {
 		log.Warn("fail to save the role", zap.String("key", k), zap.Error(err))
 	}
 	return err
@@ -818,14 +823,18 @@ func (kc *Catalog) AlterGrant(ctx context.Context, tenant string, entity *milvus
 
 	v, err = kc.Txn.Load(k)
 	if err != nil {
-		log.Warn("fail to load grant privilege entity", zap.String("key", k), zap.Any("type", operateType), zap.Error(err))
+		if common.IsKeyNotExistError(err) {
+			log.Debug("not found the privilege entity", zap.String("key", k), zap.Any("type", operateType))
+		}
 		if funcutil.IsRevoke(operateType) {
 			if common.IsKeyNotExistError(err) {
 				return common.NewIgnorableError(fmt.Errorf("the grant[%s] isn't existed", k))
 			}
+			log.Warn("fail to load grant privilege entity", zap.String("key", k), zap.Any("type", operateType), zap.Error(err))
 			return err
 		}
 		if !common.IsKeyNotExistError(err) {
+			log.Warn("fail to load grant privilege entity", zap.String("key", k), zap.Any("type", operateType), zap.Error(err))
 			return err
 		}
 
@@ -843,8 +852,10 @@ func (kc *Catalog) AlterGrant(ctx context.Context, tenant string, entity *milvus
 	if err != nil {
 		log.Warn("fail to load the grantee id", zap.String("key", k), zap.Error(err))
 		if !common.IsKeyNotExistError(err) {
+			log.Warn("fail to load the grantee id", zap.String("key", k), zap.Error(err))
 			return err
 		}
+		log.Debug("not found the grantee id", zap.String("key", k))
 		if funcutil.IsRevoke(operateType) {
 			return common.NewIgnorableError(fmt.Errorf("the grantee-id[%s] isn't existed", k))
 		}
diff --git a/internal/metastore/kv/rootcoord/kv_catalog_test.go b/internal/metastore/kv/rootcoord/kv_catalog_test.go
index 6dc087e9b73ab..1abcad6d36481 100644
--- a/internal/metastore/kv/rootcoord/kv_catalog_test.go
+++ b/internal/metastore/kv/rootcoord/kv_catalog_test.go
@@ -1477,11 +1477,10 @@ func TestRBAC_Role(t *testing.T) {
 			name    string
 
 			expectedError error
-			ignorable     bool
 		}{
-			{"key not exists", true, notExistName, nil, false},
-			{"other error", false, errorName, otherError, false},
-			{"ignorable error", false, "key1", &common.IgnorableError{}, true},
+			{"key not exists", true, notExistName, nil},
+			{"other error", false, errorName, otherError},
+			{"ignorable error", false, "key1", &common.IgnorableError{}},
 		}
 
 		for _, test := range tests {
@@ -1494,11 +1493,6 @@ func TestRBAC_Role(t *testing.T) {
 				} else {
 					assert.Error(t, err)
 				}
-
-				if test.ignorable {
-					_, ok := err.(*common.IgnorableError)
-					assert.True(t, ok)
-				}
 			})
 		}
 	})