diff --git a/internal/master/grpc_service.go b/internal/master/grpc_service.go
index caf16239e9..01dabfa128 100644
--- a/internal/master/grpc_service.go
+++ b/internal/master/grpc_service.go
@@ -2,6 +2,7 @@ package master
 
 import (
 	"context"
+	"github.com/zilliztech/milvus-distributed/internal/master/tso"
 	"time"
 
 	"github.com/zilliztech/milvus-distributed/internal/errors"
@@ -340,7 +341,7 @@ func (s *Master) ShowPartitions(ctx context.Context, in *internalpb.ShowPartitio
 
 func (s *Master) AllocTimestamp(ctx context.Context, request *internalpb.TsoRequest) (*internalpb.TsoResponse, error) {
 	count := request.GetCount()
-	ts, err := s.tsoAllocator.GenerateTSO(count)
+	ts, err := tso.Alloc(count)
 
 	if err != nil {
 		return &internalpb.TsoResponse{
diff --git a/internal/master/master.go b/internal/master/master.go
index 506dd1b8f7..e45d0a0bf1 100644
--- a/internal/master/master.go
+++ b/internal/master/master.go
@@ -43,9 +43,6 @@ type Master struct {
 	//grpc server
 	grpcServer *grpc.Server
 
-	// for tso.
-	tsoAllocator tso.Allocator
-
 	// pulsar client
 	pc *informer.PulsarClient
 
@@ -87,13 +84,13 @@ func newKVBase() *kv.EtcdKV {
 func CreateServer(ctx context.Context) (*Master, error) {
 	rand.Seed(time.Now().UnixNano())
 	id.InitGlobalIdAllocator("idTimestamp", newTSOKVBase("gid"))
+	tso.InitGlobalTsoAllocator("timestamp", newTSOKVBase("tso"))
 	m := &Master{
 		ctx:            ctx,
 		startTimestamp: time.Now().Unix(),
 		kvBase:         newKVBase(),
 		ssChan:         make(chan internalpb.SegmentStatistics, 10),
 		pc:             informer.NewPulsarClient(),
-		tsoAllocator: tso.NewGlobalTSOAllocator("timestamp", newTSOKVBase("tso")),
 	}
 	m.grpcServer = grpc.NewServer()
 	masterpb.RegisterMasterServer(m.grpcServer, m)
diff --git a/internal/master/tso/global_allocator.go b/internal/master/tso/global_allocator.go
index d553911675..a8ea4f2c30 100644
--- a/internal/master/tso/global_allocator.go
+++ b/internal/master/tso/global_allocator.go
@@ -36,8 +36,15 @@ type GlobalTSOAllocator struct {
 	tso *timestampOracle
 }
 
+var allocator *GlobalTSOAllocator
+
+func InitGlobalTsoAllocator(key string, base kv.KVBase){
+	allocator = NewGlobalTSOAllocator(key, base)
+}
+
+
 // NewGlobalTSOAllocator creates a new global TSO allocator.
-func NewGlobalTSOAllocator(key string, kvBase kv.KVBase) Allocator {
+func NewGlobalTSOAllocator(key string, kvBase kv.KVBase) *GlobalTSOAllocator {
 
 	var saveInterval time.Duration = 3 * time.Second
 	return &GlobalTSOAllocator{
@@ -97,7 +104,34 @@ func (gta *GlobalTSOAllocator) GenerateTSO(count uint32) (uint64, error) {
 	return 0, errors.New("can not get timestamp")
 }
 
+func (gta *GlobalTSOAllocator) Alloc(count uint32)(typeutil.Timestamp, error) {
+	//return gta.tso.SyncTimestamp()
+	start, err := gta.GenerateTSO(count)
+	if err != nil {
+		return typeutil.ZeroTimestamp, err
+	}
+	//ret := make([]typeutil.Timestamp, count)
+	//for i:=uint32(0); i < count; i++{
+	//	ret[i] = start + uint64(i)
+	//}
+	return start, err
+}
+
+func (gta *GlobalTSOAllocator) AllocOne()(typeutil.Timestamp, error) {
+	return gta.GenerateTSO(1)
+}
+
+
 // Reset is used to reset the TSO allocator.
 func (gta *GlobalTSOAllocator) Reset() {
 	gta.tso.ResetTimestamp()
 }
+
+func AllocOne()(typeutil.Timestamp, error) {
+	return allocator.AllocOne()
+}
+
+// Reset is used to reset the TSO allocator.
+func Alloc(count uint32)(typeutil.Timestamp, error) {
+	return allocator.Alloc(count)
+}