diff --git a/server/imserver_new/cache/cachemgr.go b/server/imserver_new/cache/cachemgr.go
index 7cd8a264..504d4571 100644
--- a/server/imserver_new/cache/cachemgr.go
+++ b/server/imserver_new/cache/cachemgr.go
@@ -8,19 +8,12 @@ import (
 	"main/constant"
 )
 
-type pendingUser struct {
-	accountId string
-	reqTime int64
-}
-
 type cacheMgr struct {
 	userHash map[string]*userProfile
-	pendingHash map[string]*pendingUser
 }
 
 func (this *cacheMgr) Init() {
 	this.userHash = make(map[string]*userProfile)
-	this.pendingHash = make(map[string]*pendingUser)
 }
 
 func (this *cacheMgr) UnInit() {
@@ -90,7 +83,20 @@ func (this *cacheMgr) AsyncSearch(sinceId int64, q string,
 }
 
 func (this *cacheMgr) internalGetUsers(accountIds []string, cb func(int32, string)) {
-
+	keys := [][]string{}
+	for _, accountId := range(accountIds) {
+		if this.getUser(accountId) == nil {
+			q5.AppendSlice(&keys, []string{constant.CACHE_LOCK_KEY, accountId})
+		}
+	}
+	if len(keys) <= 0{
+		cb(0, "")
+		return
+	}
+	f5.NewLockAsyncTask(
+		keys,
+		func (task *f5.LockAsyncTask) {
+		})
 }
 
 func (this *cacheMgr) getUser(accountId string) *userProfile {