diff --git a/pkg/master/informer/pulsar.go b/pkg/master/informer/pulsar.go
index 1ce93bcb4c..49f9b729b5 100644
--- a/pkg/master/informer/pulsar.go
+++ b/pkg/master/informer/pulsar.go
@@ -55,7 +55,8 @@ func (pc PulsarClient) Listener(ssChan chan mock.SegmentStats) error {
 		}
 		//fmt.Printf("Received message msgId: %#v -- content: '%s'\n",
 		//	msg.ID(), m.SegementID)
-		fmt.Println("Received SegmentStats -- segmentID:", m.SegementID, ",memSize:", m.MemorySize, ",memRate:", m.MemoryRate)
+		fmt.Println("Received SegmentStats -- segmentID:", m.SegementID,
+			",memSize:", m.MemorySize, ",memRate:", m.MemoryRate, ",numRows:", m.Rows, ",status:", m.Status)
 		ssChan <- m
 		consumer.Ack(msg)
 	}
diff --git a/pkg/master/server.go b/pkg/master/server.go
index aa06c0600f..f147828045 100644
--- a/pkg/master/server.go
+++ b/pkg/master/server.go
@@ -175,7 +175,7 @@ func UpdateSegmentStatus(ss mock.SegmentStats, kvbase kv.Base) error {
 		if err != nil {
 			return err
 		}
-		err = kvbase.Save("segment/"+strconv.Itoa(int(seg.CollectionID)), segData)
+		err = kvbase.Save("segment/"+strconv.Itoa(int(seg.SegmentID)), segData)
 		if err != nil {
 			return err
 		}
diff --git a/reader/read_node/query_node.go b/reader/read_node/query_node.go
index a0e75158d5..d766d0cd38 100644
--- a/reader/read_node/query_node.go
+++ b/reader/read_node/query_node.go
@@ -16,6 +16,7 @@ import "C"
 import (
 	"encoding/json"
 	"fmt"
+	"github.com/czs007/suvlim/conf"
 	"github.com/stretchr/testify/assert"
 	"log"
 	"sort"
@@ -332,16 +333,16 @@ func (node *QueryNode) RunSearch(wg *sync.WaitGroup) {
 			node.messageClient.SearchMsg = node.messageClient.SearchMsg[:0]
 			node.messageClient.SearchMsg = append(node.messageClient.SearchMsg, msg)
 			fmt.Println("Do Search...")
-			for  {
-				if node.messageClient.SearchMsg[0].Timestamp < node.queryNodeTimeSync.ServiceTimeSync {
+			//for  {
+				//if node.messageClient.SearchMsg[0].Timestamp < node.queryNodeTimeSync.ServiceTimeSync {
 					var status = node.Search(node.messageClient.SearchMsg)
 					if status.ErrorCode != 0 {
 						fmt.Println("Search Failed")
 						node.PublishFailedSearchResult()
 					}
-					break
-				}
-			}
+					//break
+				//}
+			//}
 		default:
 		}
 	}
@@ -583,8 +584,8 @@ func (node *QueryNode) Search(searchMessages []*msgPb.SearchMsg) msgPb.Status {
 		// So the ServiceTimeSync is always less than searchTimestamp.
 		// Here, we manually make searchTimestamp's logic time minus `conf.Config.Timesync.Interval` milliseconds.
 		// Which means `searchTimestamp.logicTime = searchTimestamp.logicTime - conf.Config.Timesync.Interval`.
-		// var logicTimestamp = searchTimestamp << 46 >> 46
-		// searchTimestamp = (searchTimestamp >> 18 - uint64(conf.Config.Timesync.Interval)) << 18 + logicTimestamp
+		var logicTimestamp = searchTimestamp << 46 >> 46
+		searchTimestamp = (searchTimestamp >> 18 - uint64(conf.Config.Timesync.Interval + 600)) << 18 + logicTimestamp
 
 		var vector = msg.Records
 		// We now only the first Json is valid.
@@ -602,6 +603,11 @@ func (node *QueryNode) Search(searchMessages []*msgPb.SearchMsg) msgPb.Status {
 
 		// 3. Do search in all segments
 		for _, segment := range node.SegmentsMap {
+			if segment.GetRowCount() <= 0 {
+				// Skip empty segment
+				continue
+			}
+
 			fmt.Println("Search in segment:", segment.SegmentId, ",segment rows:", segment.GetRowCount())
 			var res, err = segment.SegmentSearch(query, searchTimestamp, vector)
 			if err != nil {
@@ -618,7 +624,9 @@ func (node *QueryNode) Search(searchMessages []*msgPb.SearchMsg) msgPb.Status {
 		sort.Slice(resultsTmp, func(i, j int) bool {
 			return resultsTmp[i].ResultDistance < resultsTmp[j].ResultDistance
 		})
-		resultsTmp = resultsTmp[:query.TopK]
+		if len(resultsTmp) > query.TopK {
+			resultsTmp = resultsTmp[:query.TopK]
+		}
 		var entities = msgPb.Entities{
 			Ids: make([]int64, 0),
 		}
diff --git a/reader/read_node/segment.go b/reader/read_node/segment.go
index f6f8044c3c..3da047a4e8 100644
--- a/reader/read_node/segment.go
+++ b/reader/read_node/segment.go
@@ -144,8 +144,10 @@ func (s *Segment) SegmentInsert(offset int64, entityIDs *[]int64, timestamps *[]
 	var sizeofPerRow = len((*records)[0])
 
 	var rawData = make([]byte, numOfRow*sizeofPerRow)
+	var copyOffset = 0
 	for i := 0; i < len(*records); i++ {
-		copy(rawData, (*records)[i])
+		copy(rawData[copyOffset:], (*records)[i])
+		copyOffset += len((*records)[i])
 	}
 
 	var cOffset = C.long(offset)
diff --git a/sdk/examples/simple/insert.cpp b/sdk/examples/simple/insert.cpp
index 86c1967d28..7d4c8859d5 100644
--- a/sdk/examples/simple/insert.cpp
+++ b/sdk/examples/simple/insert.cpp
@@ -23,7 +23,7 @@
 
 const int N = 200000;
 const int DIM = 16;
-const int LOOP = 10;
+const int LOOP = 1;
 
 const milvus::FieldValue GetData() {
   milvus::FieldValue value_map;
@@ -32,7 +32,7 @@ const milvus::FieldValue GetData() {
   for (int i = 0; i < N; i++) {
     int32_data.push_back(i);
   }
-  std::default_random_engine eng(rand() % 20);
+  std::default_random_engine eng(42);
   std::normal_distribution<float> dis(0, 1);
   std::vector<milvus::VectorData> vector_data;
   for (int i = 0; i < N; i++) {
diff --git a/sdk/examples/simple/search.cpp b/sdk/examples/simple/search.cpp
index 1da315232a..f4d75eec72 100644
--- a/sdk/examples/simple/search.cpp
+++ b/sdk/examples/simple/search.cpp
@@ -41,13 +41,13 @@ int main(int argc , char**argv) {
   milvus::VectorParam vectorParam;
   std::vector<milvus::VectorData> vector_records;
 
-  std::default_random_engine eng(rand() % 20);
+  std::default_random_engine eng(42);
   std::normal_distribution<float> dis(0, 1);
  
-  for (int j = 0; j < 10; ++j) {
+  for (int j = 0; j < 1; ++j) {
     milvus::VectorData vectorData;
     std::vector<float> float_data;
-    for (int i = 0; i < 100; ++i) {
+    for (int i = 0; i < 16; ++i) {
       float_data.emplace_back(dis(eng));
     }