diff --git a/conf/conf.go b/conf/conf.go
index 81bd8d2ec6..f4f8eb179c 100644
--- a/conf/conf.go
+++ b/conf/conf.go
@@ -4,6 +4,8 @@ import (
 	"github.com/czs007/suvlim/storage/pkg/types"
 	yaml "gopkg.in/yaml.v2"
 	"io/ioutil"
+	"path"
+	"runtime"
 )
 
 // yaml.MapSlice
@@ -58,10 +60,14 @@ func init() {
 	load_config()
 }
 
+func getCurrentFileDir() string {
+    _, fpath, _, _ := runtime.Caller(0)
+    return path.Dir(fpath)
+}
+
 func load_config() {
-	//var config ServerConfig
-	filename := "../conf/config.yaml"
-	source, err := ioutil.ReadFile(filename)
+	filePath := path.Join(getCurrentFileDir(), "config.yaml")
+	source, err := ioutil.ReadFile(filePath)
 	if err != nil {
 		panic(err)
 	}
diff --git a/conf/config.yaml b/conf/config.yaml
index d5b85b439b..97034f8890 100644
--- a/conf/config.yaml
+++ b/conf/config.yaml
@@ -15,8 +15,8 @@ master:
 
 etcd:
   address: localhost
-  port: 0
-  rootpath: a
+  port: 2379
+  rootpath: suvlim
   segthreshold: 10000
 
 timesync: 
diff --git a/core/src/dog_segment/SegmentNaive.cpp b/core/src/dog_segment/SegmentNaive.cpp
index 1c16d778ae..a5bbdcd8e0 100644
--- a/core/src/dog_segment/SegmentNaive.cpp
+++ b/core/src/dog_segment/SegmentNaive.cpp
@@ -8,7 +8,6 @@
 #include <knowhere/index/vector_index/adapter/VectorAdapter.h>
 #include <knowhere/index/vector_index/VecIndexFactory.h>
 #include <faiss/utils/distances.h>
-#include <tbb/iterators.h>
 
 
 namespace milvus::dog_segment {
@@ -335,21 +334,31 @@ void
 merge_into(int64_t queries, int64_t topk, float *distances, int64_t *uids, const float *new_distances, const int64_t *new_uids) {
     for(int64_t qn = 0; qn < queries; ++qn) {
         auto base = qn * topk;
-        auto dst_dis = distances + base;
-        auto dst_uids = uids + base;
+        auto src2_dis = distances + base;
+        auto src2_uids = uids + base;
 
-        auto src_dis = new_distances + base;
-        auto src_uids = new_uids + base;
+        auto src1_dis = new_distances + base;
+        auto src1_uids = new_uids + base;
 
-        std::vector<float> buf_dis(2*topk);
-        std::vector<int64_t> buf_uids(2*topk);
+        std::vector<float> buf_dis(topk);
+        std::vector<int64_t> buf_uids(topk);
 
-        auto zip_src = tbb::make_zip_iterator(src_dis, src_uids);
-        auto zip_dst = tbb::make_zip_iterator(dst_dis, dst_uids);
-        auto zip_buf = tbb::make_zip_iterator(buf_dis.data(), buf_uids.data());
-        auto fuck = zip_src + 1;
-        std::merge(zip_dst, zip_dst + topk, zip_src, zip_src + topk, zip_buf);
-        std::copy_n(zip_buf, topk, zip_dst);
+        auto it1 = 0;
+        auto it2 = 0;
+
+        for(auto buf = 0; buf < topk; ++buf){
+            if(src1_dis[it1] <= src2_dis[it2]) {
+                buf_dis[buf] = src1_dis[it1];
+                buf_uids[buf] = src1_uids[it1];
+                ++it1;
+            } else {
+                buf_dis[buf] = src2_dis[it2];
+                buf_uids[buf] = src2_uids[it2];
+                ++it2;
+            }
+        }
+        std::copy_n(buf_dis.data(), topk, src2_dis);
+        std::copy_n(buf_uids.data(), topk, src2_uids);
     }
 }
 
diff --git a/core/unittest/test_indexing.cpp b/core/unittest/test_indexing.cpp
index d09737f2aa..430fa53552 100644
--- a/core/unittest/test_indexing.cpp
+++ b/core/unittest/test_indexing.cpp
@@ -18,7 +18,6 @@
 #include <knowhere/index/vector_index/VecIndexFactory.h>
 #include <algorithm>
 
-#include <tbb/iterators.h>
 
 using std::cin;
 using std::cout;
@@ -59,22 +58,32 @@ void
 merge_into(int64_t queries, int64_t topk, float *distances, int64_t *uids, const float *new_distances, const int64_t *new_uids) {
     for(int64_t qn = 0; qn < queries; ++qn) {
         auto base = qn * topk;
-        auto dst_dis = distances + base;
-        auto dst_uids = uids + base;
+        auto src2_dis = distances + base;
+        auto src2_uids = uids + base;
 
-        auto src_dis = new_distances + base;
-        auto src_uids = new_uids + base;
+        auto src1_dis = new_distances + base;
+        auto src1_uids = new_uids + base;
 
-        std::vector<float> buf_dis(2*topk);
-        std::vector<int64_t> buf_uids(2*topk);
+        std::vector<float> buf_dis(topk);
+        std::vector<int64_t> buf_uids(topk);
 
-        auto zip_src = tbb::make_zip_iterator(src_dis, src_uids);
-        auto zip_dst = tbb::make_zip_iterator(dst_dis, dst_uids);
-        auto zip_buf = tbb::make_zip_iterator(buf_dis.data(), buf_uids.data());
-        auto fuck = zip_src + 1;
-        std::merge(zip_dst, zip_dst + topk, zip_src, zip_src + topk, zip_buf);
-        std::copy_n(zip_buf, topk, zip_dst);
-    }
+        auto it1 = 0;
+        auto it2 = 0;
+
+        for(auto buf = 0; buf < topk; ++buf){
+            if(src1_dis[it1] <= src2_dis[it2]) {
+                buf_dis[buf] = src1_dis[it1];
+                buf_uids[buf] = src1_uids[it1];
+                ++it1;
+            } else {
+                buf_dis[buf] = src2_dis[it2];
+                buf_uids[buf] = src2_uids[it2];
+                ++it2;
+            }
+        }
+        std::copy_n(buf_dis.data(), topk, src2_dis);
+        std::copy_n(buf_uids.data(), topk, src2_uids);
+   }
 }
 
 
diff --git a/pkg/master/kv/etcd_kv.go b/pkg/master/kv/etcd_kv.go
index 8b4d87305a..dcdd065dd5 100644
--- a/pkg/master/kv/etcd_kv.go
+++ b/pkg/master/kv/etcd_kv.go
@@ -21,20 +21,43 @@ var (
 	errTxnFailed = errors.New("failed to commit transaction")
 )
 
-type etcdKVBase struct {
+type EtcdKVBase struct {
 	client   *clientv3.Client
 	rootPath string
 }
 
 // NewEtcdKVBase creates a new etcd kv.
-func NewEtcdKVBase(client *clientv3.Client, rootPath string) *etcdKVBase {
-	return &etcdKVBase{
+func NewEtcdKVBase(client *clientv3.Client, rootPath string) *EtcdKVBase {
+	return &EtcdKVBase{
 		client:   client,
 		rootPath: rootPath,
 	}
 }
 
-func (kv *etcdKVBase) Load(key string) (string, error) {
+func (kv *EtcdKVBase) LoadWithPrefix(key string) ( []string, []string) {
+	key = path.Join(kv.rootPath, key)
+	println("in loadWithPrefix,", key)
+	resp, err := etcdutil.EtcdKVGet(kv.client, key,clientv3.WithPrefix())
+	if err != nil {
+		return [] string {}, [] string {}
+	}
+	var keys []string
+	var values []string
+	for _,kvs := range resp.Kvs{
+		//println(len(kvs.))
+		if len(kvs.Key) <= 0{
+			println("KKK")
+			continue
+		}
+		keys = append(keys, string(kvs.Key))
+		values = append(values, string(kvs.Value))
+	}
+	//println(keys)
+	//println(values)
+	return keys, values
+}
+
+func (kv *EtcdKVBase) Load(key string) (string, error) {
 	key = path.Join(kv.rootPath, key)
 
 	resp, err := etcdutil.EtcdKVGet(kv.client, key)
@@ -49,7 +72,7 @@ func (kv *etcdKVBase) Load(key string) (string, error) {
 	return string(resp.Kvs[0].Value), nil
 }
 
-func (kv *etcdKVBase) Save(key, value string) error {
+func (kv *EtcdKVBase) Save(key, value string) error {
 	key = path.Join(kv.rootPath, key)
 
 	txn := NewSlowLogTxn(kv.client)
@@ -64,7 +87,7 @@ func (kv *etcdKVBase) Save(key, value string) error {
 	return nil
 }
 
-func (kv *etcdKVBase) Remove(key string) error {
+func (kv *EtcdKVBase) Remove(key string) error {
 	key = path.Join(kv.rootPath, key)
 
 	txn := NewSlowLogTxn(kv.client)
@@ -79,12 +102,18 @@ func (kv *etcdKVBase) Remove(key string) error {
 	return nil
 }
 
-func (kv *etcdKVBase) Watch(key string) clientv3.WatchChan {
+func (kv *EtcdKVBase) Watch(key string) clientv3.WatchChan {
 	key = path.Join(kv.rootPath, key)
 	rch := kv.client.Watch(context.Background(), key)
 	return rch
 }
 
+func (kv *EtcdKVBase) WatchWithPrefix(key string) clientv3.WatchChan {
+	key = path.Join(kv.rootPath, key)
+	rch := kv.client.Watch(context.Background(), key, clientv3.WithPrefix())
+	return rch
+}
+
 // SlowLogTxn wraps etcd transaction and log slow one.
 type SlowLogTxn struct {
 	clientv3.Txn
diff --git a/pkg/master/kv/kv.go b/pkg/master/kv/kv.go
index 223fd2b9e2..0485299d10 100644
--- a/pkg/master/kv/kv.go
+++ b/pkg/master/kv/kv.go
@@ -7,4 +7,6 @@ type Base interface {
 	Save(key, value string) error
 	Remove(key string) error
 	Watch(key string) clientv3.WatchChan
+	WatchWithPrefix(key string) clientv3.WatchChan
+	LoadWithPrefix(key string) ( []string, []string)
 }
diff --git a/reader/main.go b/reader/main.go
new file mode 100644
index 0000000000..14dabbe2a2
--- /dev/null
+++ b/reader/main.go
@@ -0,0 +1,26 @@
+package main
+
+import (
+	reader "github.com/czs007/suvlim/reader/read_node"
+	"sync"
+)
+
+func main() {
+	pulsarURL := "pulsar://localhost:6650"
+
+	numOfQueryNode := 2
+
+	go reader.StartQueryNode(pulsarURL, numOfQueryNode, 0)
+	reader.StartQueryNode(pulsarURL, numOfQueryNode, 1)
+
+
+}
+
+func main2() {
+	wg := sync.WaitGroup{}
+	//ctx, cancel := context.WithCancel(context.Background())
+	//defer cancel()
+	wg.Add(1)
+	reader.StartQueryNode2()
+	wg.Wait()
+}
\ No newline at end of file
diff --git a/reader/collection.go b/reader/read_node/collection.go
similarity index 81%
rename from reader/collection.go
rename to reader/read_node/collection.go
index 09991e9f9d..2d74a6cde0 100644
--- a/reader/collection.go
+++ b/reader/read_node/collection.go
@@ -2,9 +2,9 @@ package reader
 
 /*
 
-#cgo CFLAGS: -I../core/include
+#cgo CFLAGS: -I${SRCDIR}/../../core/include
 
-#cgo LDFLAGS: -L../core/lib -lmilvus_dog_segment -Wl,-rpath=../core/lib
+#cgo LDFLAGS: -L${SRCDIR}/../../core/lib -lmilvus_dog_segment -Wl,-rpath=${SRCDIR}/../../core/lib
 
 #include "collection_c.h"
 #include "partition_c.h"
@@ -16,6 +16,7 @@ import "C"
 type Collection struct {
 	CollectionPtr C.CCollection
 	CollectionName string
+	CollectionID uint64
 	Partitions []*Partition
 }
 
diff --git a/reader/index.go b/reader/read_node/index.go
similarity index 100%
rename from reader/index.go
rename to reader/read_node/index.go
diff --git a/reader/index_test.go b/reader/read_node/index_test.go
similarity index 100%
rename from reader/index_test.go
rename to reader/read_node/index_test.go
diff --git a/reader/read_node/meta.go b/reader/read_node/meta.go
new file mode 100644
index 0000000000..ace763020a
--- /dev/null
+++ b/reader/read_node/meta.go
@@ -0,0 +1,233 @@
+package reader
+
+import (
+	"context"
+	"fmt"
+	"github.com/czs007/suvlim/pkg/master/mock"
+	"reflect"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+	"github.com/czs007/suvlim/conf"
+	"github.com/czs007/suvlim/pkg/master/kv"
+	"go.etcd.io/etcd/clientv3"
+	"go.etcd.io/etcd/mvcc/mvccpb"
+)
+
+const (
+	CollectonPrefix = "/collection/"
+	SegmentPrefix = "/segment/"
+)
+
+
+func GetCollectionObjId(key string) string {
+	prefix  := conf.Config.Etcd.Rootpath + CollectonPrefix
+	return strings.TrimPrefix(key, prefix)
+}
+
+func GetSegmentObjId(key string) string {
+	prefix  := conf.Config.Etcd.Rootpath + SegmentPrefix
+	return strings.TrimPrefix(key, prefix)
+}
+
+func isCollectionObj(key string) bool {
+	prefix  := conf.Config.Etcd.Rootpath + CollectonPrefix
+	prefix = strings.TrimSpace(prefix)
+	println("prefix is :$", prefix)
+	index := strings.Index(key, prefix)
+	println("index is :", index)
+	return index == 0
+}
+
+func isSegmentObj(key string) bool {
+	prefix  := conf.Config.Etcd.Rootpath + SegmentPrefix
+	prefix = strings.TrimSpace(prefix)
+	index := strings.Index(key, prefix)
+	return index == 0
+}
+
+func printCollectionStruct(obj *mock.Collection){
+	v := reflect.ValueOf(obj)
+	v = reflect.Indirect(v)
+	typeOfS := v.Type()
+
+	for i := 0; i< v.NumField(); i++ {
+		if typeOfS.Field(i).Name == "GrpcMarshalString"{
+			continue
+		}
+		fmt.Printf("Field: %s\tValue: %v\n", typeOfS.Field(i).Name, v.Field(i).Interface())
+	}
+}
+
+func printSegmentStruct(obj *mock.Segment){
+	v := reflect.ValueOf(obj)
+	v = reflect.Indirect(v)
+	typeOfS := v.Type()
+
+	for i := 0; i< v.NumField(); i++ {
+		fmt.Printf("Field: %s\tValue: %v\n", typeOfS.Field(i).Name, v.Field(i).Interface())
+	}
+}
+
+func (node *QueryNode) processCollectionCreate(id string, value string) {
+	println(fmt.Sprintf("Create Collection:$%s$", id))
+	collection, err := mock.JSON2Collection(value)
+	if err != nil {
+		println("error of json 2 collection")
+		println(err.Error())
+	}
+	printCollectionStruct(collection)
+}
+
+func (node *QueryNode) processSegmentCreate(id string, value string) {
+	println("Create Segment: ", id)
+	segment, err := mock.JSON2Segment(value)
+	if err != nil {
+		println("error of json 2 segment")
+		println(err.Error())
+	}
+	printSegmentStruct(segment)
+}
+
+func (node *QueryNode) processCreate(key string, msg string) {
+	println("process create", key, ":", msg)
+	if isCollectionObj(key){
+		objID := GetCollectionObjId(key)
+		node.processCollectionCreate(objID, msg)
+	}else if isSegmentObj(key){
+		objID := GetSegmentObjId(key)
+		node.processSegmentCreate(objID, msg)
+	}else {
+		println("can not process create msg:", key)
+	}
+}
+
+func (node *QueryNode) processSegmentModify(id string, value string) {
+	println("Modify Segment: ", id)
+
+	segment, err := mock.JSON2Segment(value)
+	if err != nil {
+		println("error of json 2 segment")
+		println(err.Error())
+	}
+	printSegmentStruct(segment)
+}
+
+func (node *QueryNode) processCollectionModify(id string, value string) {
+	println("Modify Collection: ", id)
+	collection, err := mock.JSON2Collection(value)
+	if err != nil {
+		println("error of json 2 collection")
+		println(err.Error())
+	}
+	printCollectionStruct(collection)
+}
+
+func (node *QueryNode) processModify(key string, msg string){
+	println("process modify")
+	if isCollectionObj(key){
+		objID := GetCollectionObjId(key)
+		node.processCollectionModify(objID, msg)
+	}else if isSegmentObj(key){
+		objID := GetSegmentObjId(key)
+		node.processSegmentModify(objID, msg)
+	}else {
+		println("can not process modify msg:", key)
+	}
+}
+
+
+func (node *QueryNode) processSegmentDelete(id string){
+	println("Delete segment: ", id)
+
+}
+func (node *QueryNode) processCollectionDelete(id string){
+	println("Delete collection: ", id)
+}
+
+func (node *QueryNode) processDelete(key string){
+	println("process delete")
+	if isCollectionObj(key){
+		objID := GetCollectionObjId(key)
+		node.processCollectionDelete(objID)
+	}else if isSegmentObj(key){
+		objID := GetSegmentObjId(key)
+		node.processSegmentDelete(objID)
+	}else {
+		println("can not process delete msg:", key)
+	}
+}
+
+func (node *QueryNode) processResp(resp clientv3.WatchResponse) error {
+	err := resp.Err()
+	if err != nil {
+		return err
+	}
+	for _, ev := range resp.Events {
+		if ev.IsCreate() {
+			key := string(ev.Kv.Key)
+			msg := string(ev.Kv.Value)
+			node.processCreate(key, msg)
+		} else if ev.IsModify() {
+			key := string(ev.Kv.Key)
+			msg := string(ev.Kv.Value)
+			node.processModify(key, msg)
+		} else if ev.Type == mvccpb.DELETE {
+			key := string(ev.Kv.Key)
+			node.processDelete(key)
+		} else {
+			println("Unrecognized etcd msg!")
+		}
+	}
+	return nil
+}
+
+func (node *QueryNode) loadCollections() error {
+	keys, values := node.kvBase.LoadWithPrefix(CollectonPrefix)
+	for i:= range keys{
+		objID := GetCollectionObjId(keys[i])
+		node.processCollectionCreate(objID, values[i])
+	}
+	return nil
+}
+func (node *QueryNode) loadSegments() error {
+	keys, values := node.kvBase.LoadWithPrefix(SegmentPrefix)
+	for i:= range keys{
+		objID := GetSegmentObjId(keys[i])
+		node.processSegmentCreate(objID, values[i])
+	}
+	return nil
+}
+
+func (node *QueryNode) InitFromMeta() error {
+	//pass
+	etcdAddr := "http://"
+	etcdAddr += conf.Config.Etcd.Address
+	etcdPort := conf.Config.Etcd.Port
+	etcdAddr = etcdAddr + ":" + strconv.FormatInt(int64(etcdPort), 10)
+	cli, _ := clientv3.New(clientv3.Config{
+		Endpoints:   []string{etcdAddr},
+		DialTimeout: 5 * time.Second,
+	})
+	defer cli.Close()
+	node.kvBase = kv.NewEtcdKVBase(cli, conf.Config.Etcd.Rootpath)
+	node.loadCollections()
+	node.loadSegments()
+	return nil
+}
+
+func (node *QueryNode) RunMetaService(ctx context.Context, wg *sync.WaitGroup) {
+	node.InitFromMeta()
+	metaChan := node.kvBase.WatchWithPrefix("")
+	for {
+		select {
+		case <-ctx.Done():
+			wg.Done()
+			println("DONE!!!!!!")
+			return
+		case resp := <-metaChan:
+			node.processResp(resp)
+		}
+	}
+}
\ No newline at end of file
diff --git a/reader/partition.go b/reader/read_node/partition.go
similarity index 82%
rename from reader/partition.go
rename to reader/read_node/partition.go
index 7e5da29261..b887c1b5f1 100644
--- a/reader/partition.go
+++ b/reader/read_node/partition.go
@@ -2,9 +2,9 @@ package reader
 
 /*
 
-#cgo CFLAGS: -I../core/include
+#cgo CFLAGS: -I${SRCDIR}/../../core/include
 
-#cgo LDFLAGS: -L../core/lib -lmilvus_dog_segment -Wl,-rpath=../core/lib
+#cgo LDFLAGS: -L${SRCDIR}/../../core/lib -lmilvus_dog_segment -Wl,-rpath=${SRCDIR}/../../core/lib
 
 #include "collection_c.h"
 #include "partition_c.h"
diff --git a/reader/query_node.go b/reader/read_node/query_node.go
similarity index 94%
rename from reader/query_node.go
rename to reader/read_node/query_node.go
index 3f761d7e94..7c09f641cd 100644
--- a/reader/query_node.go
+++ b/reader/read_node/query_node.go
@@ -2,9 +2,9 @@ package reader
 
 /*
 
-#cgo CFLAGS: -I../core/include
+#cgo CFLAGS: -I${SRCDIR}/../../core/include
 
-#cgo LDFLAGS: -L../core/lib -lmilvus_dog_segment -Wl,-rpath=../core/lib
+#cgo LDFLAGS: -L${SRCDIR}/../../core/lib -lmilvus_dog_segment -Wl,-rpath=${SRCDIR}/../../core/lib
 
 #include "collection_c.h"
 #include "partition_c.h"
@@ -15,11 +15,14 @@ import "C"
 
 import (
 	"fmt"
-	msgPb "github.com/czs007/suvlim/pkg/master/grpc/message"
-	"github.com/czs007/suvlim/reader/message_client"
 	"sort"
 	"sync"
 	"sync/atomic"
+
+	msgPb "github.com/czs007/suvlim/pkg/master/grpc/message"
+	"github.com/czs007/suvlim/pkg/master/kv"
+	"github.com/czs007/suvlim/reader/message_client"
+	//"github.com/stretchr/testify/assert"
 )
 
 type InsertData struct {
@@ -54,16 +57,17 @@ type QueryNodeDataBuffer struct {
 }
 
 type QueryNode struct {
-	QueryNodeId          uint64
-	Collections          []*Collection
-	SegmentsMap          map[int64]*Segment
-	messageClient        *message_client.MessageClient
+	QueryNodeId   uint64
+	Collections   []*Collection
+	SegmentsMap   map[int64]*Segment
+	messageClient *message_client.MessageClient
 	//mc                   *message_client.MessageClient
 	queryNodeTimeSync    *QueryNodeTime
 	buffer               QueryNodeDataBuffer
 	deletePreprocessData DeletePreprocessData
 	deleteData           DeleteData
 	insertData           InsertData
+	kvBase               *kv.EtcdKVBase
 }
 
 func NewQueryNode(queryNodeId uint64, timeSync uint64) *QueryNode {
@@ -87,12 +91,12 @@ func NewQueryNode(queryNodeId uint64, timeSync uint64) *QueryNode {
 	}
 
 	return &QueryNode{
-		QueryNodeId:          queryNodeId,
-		Collections:          nil,
-		SegmentsMap:          segmentsMap,
-		messageClient:        &mc,
-		queryNodeTimeSync:    queryNodeTimeSync,
-		buffer:               buffer,
+		QueryNodeId:       queryNodeId,
+		Collections:       nil,
+		SegmentsMap:       segmentsMap,
+		messageClient:     &mc,
+		queryNodeTimeSync: queryNodeTimeSync,
+		buffer:            buffer,
 	}
 }
 
@@ -119,12 +123,12 @@ func CreateQueryNode(queryNodeId uint64, timeSync uint64, mc *message_client.Mes
 	}
 
 	return &QueryNode{
-		QueryNodeId:          queryNodeId,
-		Collections:          nil,
-		SegmentsMap:          segmentsMap,
-		messageClient:        mc,
-		queryNodeTimeSync:    queryNodeTimeSync,
-		buffer:               buffer,
+		QueryNodeId:       queryNodeId,
+		Collections:       nil,
+		SegmentsMap:       segmentsMap,
+		messageClient:     mc,
+		queryNodeTimeSync: queryNodeTimeSync,
+		buffer:            buffer,
 	}
 }
 
@@ -173,7 +177,7 @@ func (node *QueryNode) DeleteCollection(collection *Collection) {
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
 func (node *QueryNode) PrepareBatchMsg() []int {
-	var msgLen= node.messageClient.PrepareBatchMsg()
+	var msgLen = node.messageClient.PrepareBatchMsg()
 	return msgLen
 }
 
@@ -189,7 +193,7 @@ func (node *QueryNode) InitQueryNodeCollection() {
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-func (node *QueryNode) RunInsertDelete(wg * sync.WaitGroup) {
+func (node *QueryNode) RunInsertDelete(wg *sync.WaitGroup) {
 	for {
 		// TODO: get timeRange from message client
 		var msgLen = node.PrepareBatchMsg()
@@ -271,7 +275,7 @@ func (node *QueryNode) MessagesPreprocess(insertDeleteMessages []*msgPb.InsertOr
 	}
 
 	// 2. Remove invalid messages from buffer.
-	tmpInsertOrDeleteBuffer := make([]*msgPb.InsertOrDeleteMsg ,0)
+	tmpInsertOrDeleteBuffer := make([]*msgPb.InsertOrDeleteMsg, 0)
 	for i, isValid := range node.buffer.validInsertDeleteBuffer {
 		if isValid {
 			tmpInsertOrDeleteBuffer = append(tmpInsertOrDeleteBuffer, node.buffer.InsertDeleteBuffer[i])
diff --git a/reader/query_node_time.go b/reader/read_node/query_node_time.go
similarity index 100%
rename from reader/query_node_time.go
rename to reader/read_node/query_node_time.go
diff --git a/reader/quety_node_test.go b/reader/read_node/quety_node_test.go
similarity index 100%
rename from reader/quety_node_test.go
rename to reader/read_node/quety_node_test.go
diff --git a/reader/reader.go b/reader/read_node/reader.go
similarity index 70%
rename from reader/reader.go
rename to reader/read_node/reader.go
index 8afe3edc76..82bf102068 100644
--- a/reader/reader.go
+++ b/reader/read_node/reader.go
@@ -1,9 +1,11 @@
 package reader
 
 import (
-	"github.com/czs007/suvlim/reader/message_client"
+	"context"
 	"log"
 	"sync"
+
+	"github.com/czs007/suvlim/reader/message_client"
 )
 
 func StartQueryNode(pulsarURL string, numOfQueryNode int, messageClientID int) {
@@ -32,3 +34,16 @@ func StartQueryNode(pulsarURL string, numOfQueryNode int, messageClientID int) {
 	wg.Wait()
 	qn.Close()
 }
+
+func StartQueryNode2() {
+	ctx := context.Background()
+	qn := CreateQueryNode(0, 0, nil)
+	//qn.InitQueryNodeCollection()
+	wg := sync.WaitGroup{}
+	wg.Add(1)
+	//go qn.RunInsertDelete(&wg)
+	//go qn.RunSearch(&wg)
+	go qn.RunMetaService(ctx, &wg)
+	wg.Wait()
+	qn.Close()
+}
diff --git a/reader/reader_test.go b/reader/read_node/reader_test.go
similarity index 100%
rename from reader/reader_test.go
rename to reader/read_node/reader_test.go
diff --git a/reader/result.go b/reader/read_node/result.go
similarity index 100%
rename from reader/result.go
rename to reader/read_node/result.go
diff --git a/reader/result_test.go b/reader/read_node/result_test.go
similarity index 100%
rename from reader/result_test.go
rename to reader/read_node/result_test.go
diff --git a/reader/segment.go b/reader/read_node/segment.go
similarity index 97%
rename from reader/segment.go
rename to reader/read_node/segment.go
index 0aac20ae56..cfbbd2f4da 100644
--- a/reader/segment.go
+++ b/reader/read_node/segment.go
@@ -2,9 +2,9 @@ package reader
 
 /*
 
-#cgo CFLAGS: -I../core/include
+#cgo CFLAGS: -I${SRCDIR}/../../core/include
 
-#cgo LDFLAGS: -L../core/lib -lmilvus_dog_segment -Wl,-rpath=../core/lib
+#cgo LDFLAGS: -L${SRCDIR}/../../core/lib -lmilvus_dog_segment -Wl,-rpath=${SRCDIR}/../../core/lib
 
 #include "collection_c.h"
 #include "partition_c.h"
diff --git a/reader/segment_service.go b/reader/read_node/segment_service.go
similarity index 100%
rename from reader/segment_service.go
rename to reader/read_node/segment_service.go
diff --git a/reader/segment_service_test.go b/reader/read_node/segment_service_test.go
similarity index 100%
rename from reader/segment_service_test.go
rename to reader/read_node/segment_service_test.go
diff --git a/reader/segment_test.go b/reader/read_node/segment_test.go
similarity index 100%
rename from reader/segment_test.go
rename to reader/read_node/segment_test.go
diff --git a/reader/util_functions.go b/reader/read_node/util_functions.go
similarity index 100%
rename from reader/util_functions.go
rename to reader/read_node/util_functions.go
diff --git a/reader/util_functions_test.go b/reader/read_node/util_functions_test.go
similarity index 100%
rename from reader/util_functions_test.go
rename to reader/read_node/util_functions_test.go