diff --git a/configs/advanced/data_node.yaml b/configs/advanced/data_node.yaml
index 27b49ccf2e8eb7e38466161b2ab82c517173843b..84f403ac23b1945c2486c5e0bfff02df3c4c8e12 100644
--- a/configs/advanced/data_node.yaml
+++ b/configs/advanced/data_node.yaml
@@ -34,7 +34,7 @@ dataNode:
 
     segStatistics:
       recvBufSize: 64
-      publishInterval: 1000 # milliseconds
+      updateInterval: 1000 # milliseconds
 
   flush:
     # max buffer size to flush
diff --git a/internal/core/src/pb/common.pb.cc b/internal/core/src/pb/common.pb.cc
index 26a5543370b70aed40f1f1bb8909bfdead93bf57..2e9dadc1568f946b9a86995f3ed16f92c952bc11 100644
--- a/internal/core/src/pb/common.pb.cc
+++ b/internal/core/src/pb/common.pb.cc
@@ -249,7 +249,7 @@ const char descriptor_table_protodef_common_2eproto[] PROTOBUF_SECTION_VARIABLE(
   "PE\020\027\022\021\n\rOUT_OF_MEMORY\020\030\022\024\n\017DD_REQUEST_RA"
   "CE\020\350\007*N\n\nIndexState\022\010\n\004NONE\020\000\022\014\n\010UNISSUE"
   "D\020\001\022\016\n\nINPROGRESS\020\002\022\014\n\010FINISHED\020\003\022\n\n\006FAI"
-  "LED\020\004*\274\004\n\007MsgType\022\t\n\005kNone\020\000\022\025\n\021kCreateC"
+  "LED\020\004*\325\004\n\007MsgType\022\t\n\005kNone\020\000\022\025\n\021kCreateC"
   "ollection\020d\022\023\n\017kDropCollection\020e\022\022\n\016kHas"
   "Collection\020f\022\027\n\023kDescribeCollection\020g\022\024\n"
   "\020kShowCollections\020h\022\022\n\016kGetSysConfigs\020i\022"
@@ -263,9 +263,10 @@ const char descriptor_table_protodef_common_2eproto[] PROTOBUF_SECTION_VARIABLE(
   "\027kGetPartitionStatistics\020\370\003\022\016\n\tkTimeTick"
   "\020\260\t\022\024\n\017kQueryNodeStats\020\261\t\022\017\n\nkLoadIndex\020"
   "\262\t\022\017\n\nkRequestID\020\263\t\022\020\n\013kRequestTSO\020\264\t\022\025\n"
-  "\020kAllocateSegment\020\265\tBBZ@github.com/zilli"
-  "ztech/milvus-distributed/internal/proto/"
-  "commonpbb\006proto3"
+  "\020kAllocateSegment\020\265\t\022\027\n\022kSegmentStatisti"
+  "cs\020\266\tBBZ@github.com/zilliztech/milvus-di"
+  "stributed/internal/proto/commonpbb\006proto"
+  "3"
   ;
 static const ::PROTOBUF_NAMESPACE_ID::internal::DescriptorTable*const descriptor_table_common_2eproto_deps[1] = {
 };
@@ -281,7 +282,7 @@ static ::PROTOBUF_NAMESPACE_ID::internal::SCCInfoBase*const descriptor_table_com
 static ::PROTOBUF_NAMESPACE_ID::internal::once_flag descriptor_table_common_2eproto_once;
 static bool descriptor_table_common_2eproto_initialized = false;
 const ::PROTOBUF_NAMESPACE_ID::internal::DescriptorTable descriptor_table_common_2eproto = {
-  &descriptor_table_common_2eproto_initialized, descriptor_table_protodef_common_2eproto, "common.proto", 1696,
+  &descriptor_table_common_2eproto_initialized, descriptor_table_protodef_common_2eproto, "common.proto", 1721,
   &descriptor_table_common_2eproto_once, descriptor_table_common_2eproto_sccs, descriptor_table_common_2eproto_deps, 7, 0,
   schemas, file_default_instances, TableStruct_common_2eproto::offsets,
   file_level_metadata_common_2eproto, 7, file_level_enum_descriptors_common_2eproto, file_level_service_descriptors_common_2eproto,
@@ -380,6 +381,7 @@ bool MsgType_IsValid(int value) {
     case 1203:
     case 1204:
     case 1205:
+    case 1206:
       return true;
     default:
       return false;
diff --git a/internal/core/src/pb/common.pb.h b/internal/core/src/pb/common.pb.h
index 343f38dde7f749c30405c19b7c2a47752e4be372..ed02996df270b00e89857f09c92817a026e1c46e 100644
--- a/internal/core/src/pb/common.pb.h
+++ b/internal/core/src/pb/common.pb.h
@@ -200,12 +200,13 @@ enum MsgType : int {
   kRequestID = 1203,
   kRequestTSO = 1204,
   kAllocateSegment = 1205,
+  kSegmentStatistics = 1206,
   MsgType_INT_MIN_SENTINEL_DO_NOT_USE_ = std::numeric_limits<::PROTOBUF_NAMESPACE_ID::int32>::min(),
   MsgType_INT_MAX_SENTINEL_DO_NOT_USE_ = std::numeric_limits<::PROTOBUF_NAMESPACE_ID::int32>::max()
 };
 bool MsgType_IsValid(int value);
 constexpr MsgType MsgType_MIN = kNone;
-constexpr MsgType MsgType_MAX = kAllocateSegment;
+constexpr MsgType MsgType_MAX = kSegmentStatistics;
 constexpr int MsgType_ARRAYSIZE = MsgType_MAX + 1;
 
 const ::PROTOBUF_NAMESPACE_ID::EnumDescriptor* MsgType_descriptor();
diff --git a/internal/datanode/collection_replica.go b/internal/datanode/collection_replica.go
index e2b916e59dc7fa7730ee6b539e40a816783fc434..119fb86ba520857f32f92a1ab97cef34c6fb02bf 100644
--- a/internal/datanode/collection_replica.go
+++ b/internal/datanode/collection_replica.go
@@ -1,11 +1,11 @@
 package datanode
 
 import (
-	"fmt"
-	"strconv"
+	"log"
 	"sync"
 
 	"github.com/zilliztech/milvus-distributed/internal/errors"
+	"github.com/zilliztech/milvus-distributed/internal/proto/internalpb2"
 )
 
 type collectionReplica interface {
@@ -17,17 +17,100 @@ type collectionReplica interface {
 	getCollectionByID(collectionID UniqueID) (*Collection, error)
 	getCollectionByName(collectionName string) (*Collection, error)
 	hasCollection(collectionID UniqueID) bool
-	getSegmentStatistics() // GOOSE TODO
-}
 
-type collectionReplicaImpl struct {
-	mu          sync.RWMutex
-	collections []*Collection
+	// segment
+	addSegment(segmentID UniqueID) error
+	removeSegment(segmentID UniqueID) error
+	hasSegment(segmentID UniqueID) bool
+	updateSegmentRowNums(segmentID UniqueID, numRows int64) error
+	getSegmentStatisticsUpdates(segmentID UniqueID) (*internalpb2.SegmentStatisticsUpdates, error)
 }
 
+type (
+	Segment struct {
+		segmentID  UniqueID
+		numRows    int64
+		memorySize int64
+	}
+
+	collectionReplicaImpl struct {
+		mu          sync.RWMutex
+		collections []*Collection
+		segments    []*Segment
+	}
+)
+
 //----------------------------------------------------------------------------------------------------- collection
-func (colReplica *collectionReplicaImpl) getSegmentStatistics() {
-	// GOOSE TODO
+
+func (colReplica *collectionReplicaImpl) addSegment(segmentID UniqueID) error {
+	colReplica.mu.RLock()
+	defer colReplica.mu.RUnlock()
+	log.Println("Add Segment", segmentID)
+	seg := &Segment{
+		segmentID: segmentID,
+	}
+	colReplica.segments = append(colReplica.segments, seg)
+	return nil
+}
+
+func (colReplica *collectionReplicaImpl) removeSegment(segmentID UniqueID) error {
+	colReplica.mu.RLock()
+	defer colReplica.mu.RUnlock()
+
+	for index, ele := range colReplica.segments {
+		if ele.segmentID == segmentID {
+			log.Println("Removing segment:", segmentID)
+			numOfSegs := len(colReplica.segments)
+			colReplica.segments[index] = colReplica.segments[numOfSegs-1]
+			colReplica.segments = colReplica.segments[:numOfSegs-1]
+			return nil
+		}
+	}
+	return errors.Errorf("Error, there's no segment %v", segmentID)
+}
+
+func (colReplica *collectionReplicaImpl) hasSegment(segmentID UniqueID) bool {
+	colReplica.mu.RLock()
+	defer colReplica.mu.RUnlock()
+
+	for _, ele := range colReplica.segments {
+		if ele.segmentID == segmentID {
+			return true
+		}
+	}
+	return false
+}
+
+func (colReplica *collectionReplicaImpl) updateSegmentRowNums(segmentID UniqueID, numRows int64) error {
+	colReplica.mu.RLock()
+	defer colReplica.mu.RUnlock()
+
+	for _, ele := range colReplica.segments {
+		if ele.segmentID == segmentID {
+			log.Printf("updating segment(%v) row nums: (%v)", segmentID, numRows)
+			ele.memorySize = 0
+			ele.numRows += numRows
+			return nil
+		}
+	}
+	return errors.Errorf("Error, there's no segment %v", segmentID)
+}
+
+func (colReplica *collectionReplicaImpl) getSegmentStatisticsUpdates(segmentID UniqueID) (*internalpb2.SegmentStatisticsUpdates, error) {
+	colReplica.mu.RLock()
+	defer colReplica.mu.RUnlock()
+
+	for _, ele := range colReplica.segments {
+		if ele.segmentID == segmentID {
+			updates := &internalpb2.SegmentStatisticsUpdates{
+				SegmentID:  segmentID,
+				MemorySize: ele.memorySize,
+				NumRows:    ele.numRows,
+			}
+			return updates, nil
+		}
+	}
+	return nil, errors.Errorf("Error, there's no segment %v", segmentID)
 }
 
 func (colReplica *collectionReplicaImpl) getCollectionNum() int {
@@ -43,13 +126,13 @@ func (colReplica *collectionReplicaImpl) addCollection(collectionID UniqueID, sc
 
 	var newCollection = newCollection(collectionID, schemaBlob)
 	colReplica.collections = append(colReplica.collections, newCollection)
-	fmt.Println("yyy, create collection: ", newCollection.Name())
+	log.Println("Create collection: ", newCollection.Name())
 
 	return nil
 }
 
 func (colReplica *collectionReplicaImpl) removeCollection(collectionID UniqueID) error {
-	fmt.Println("drop collection:", collectionID)
+	// GOOSE TODO: optimize
 	colReplica.mu.Lock()
 	defer colReplica.mu.Unlock()
 
@@ -58,7 +141,7 @@ func (colReplica *collectionReplicaImpl) removeCollection(collectionID UniqueID)
 		if col.ID() != collectionID {
 			tmpCollections = append(tmpCollections, col)
 		} else {
-			fmt.Println("yyy, drop collection name: ", col.Name())
+			log.Println("Drop collection : ", col.Name())
 		}
 	}
 	colReplica.collections = tmpCollections
@@ -74,8 +157,7 @@ func (colReplica *collectionReplicaImpl) getCollectionByID(collectionID UniqueID
 			return collection, nil
 		}
 	}
-
-	return nil, errors.New("cannot find collection, id = " + strconv.FormatInt(collectionID, 10))
+	return nil, errors.Errorf("cannot find collection, id = %v", collectionID)
 }
 
 func (colReplica *collectionReplicaImpl) getCollectionByName(collectionName string) (*Collection, error) {
@@ -88,7 +170,7 @@ func (colReplica *collectionReplicaImpl) getCollectionByName(collectionName stri
 		}
 	}
 
-	return nil, errors.New("Cannot found collection: " + collectionName)
+	return nil, errors.Errorf("Cannot found collection: %v", collectionName)
 }
 
 func (colReplica *collectionReplicaImpl) hasCollection(collectionID UniqueID) bool {
diff --git a/internal/datanode/collection_replica_test.go b/internal/datanode/collection_replica_test.go
index c9d98394114611e0e2c80fefd05009048cd77d6a..98e3f83b60af752611ba27da8494a57642059259 100644
--- a/internal/datanode/collection_replica_test.go
+++ b/internal/datanode/collection_replica_test.go
@@ -67,7 +67,7 @@ func genTestCollectionMeta(collectionName string, collectionID UniqueID) *etcdpb
 	return &collectionMeta
 }
 
-func initTestMeta(t *testing.T, replica collectionReplica, collectionName string, collectionID UniqueID, segmentID UniqueID) {
+func initTestReplicaMeta(t *testing.T, replica collectionReplica, collectionName string, collectionID UniqueID, segmentID UniqueID) {
 	collectionMeta := genTestCollectionMeta(collectionName, collectionID)
 
 	schemaBlob := proto.MarshalTextString(collectionMeta.Schema)
@@ -87,18 +87,18 @@ func initTestMeta(t *testing.T, replica collectionReplica, collectionName string
 //----------------------------------------------------------------------------------------------------- collection
 func TestCollectionReplica_getCollectionNum(t *testing.T) {
 	replica := newReplica()
-	initTestMeta(t, replica, "collection0", 0, 0)
+	initTestReplicaMeta(t, replica, "collection0", 0, 0)
 	assert.Equal(t, replica.getCollectionNum(), 1)
 }
 
 func TestCollectionReplica_addCollection(t *testing.T) {
 	replica := newReplica()
-	initTestMeta(t, replica, "collection0", 0, 0)
+	initTestReplicaMeta(t, replica, "collection0", 0, 0)
 }
 
 func TestCollectionReplica_removeCollection(t *testing.T) {
 	replica := newReplica()
-	initTestMeta(t, replica, "collection0", 0, 0)
+	initTestReplicaMeta(t, replica, "collection0", 0, 0)
 	assert.Equal(t, replica.getCollectionNum(), 1)
 
 	err := replica.removeCollection(0)
@@ -110,7 +110,7 @@ func TestCollectionReplica_getCollectionByID(t *testing.T) {
 	replica := newReplica()
 	collectionName := "collection0"
 	collectionID := UniqueID(0)
-	initTestMeta(t, replica, collectionName, collectionID, 0)
+	initTestReplicaMeta(t, replica, collectionName, collectionID, 0)
 	targetCollection, err := replica.getCollectionByID(collectionID)
 	assert.NoError(t, err)
 	assert.NotNil(t, targetCollection)
@@ -122,7 +122,7 @@ func TestCollectionReplica_getCollectionByName(t *testing.T) {
 	replica := newReplica()
 	collectionName := "collection0"
 	collectionID := UniqueID(0)
-	initTestMeta(t, replica, collectionName, collectionID, 0)
+	initTestReplicaMeta(t, replica, collectionName, collectionID, 0)
 
 	targetCollection, err := replica.getCollectionByName(collectionName)
 	assert.NoError(t, err)
@@ -136,7 +136,7 @@ func TestCollectionReplica_hasCollection(t *testing.T) {
 	replica := newReplica()
 	collectionName := "collection0"
 	collectionID := UniqueID(0)
-	initTestMeta(t, replica, collectionName, collectionID, 0)
+	initTestReplicaMeta(t, replica, collectionName, collectionID, 0)
 
 	hasCollection := replica.hasCollection(collectionID)
 	assert.Equal(t, hasCollection, true)
@@ -149,6 +149,6 @@ func TestCollectionReplica_freeAll(t *testing.T) {
 	replica := newReplica()
 	collectionName := "collection0"
 	collectionID := UniqueID(0)
-	initTestMeta(t, replica, collectionName, collectionID, 0)
+	initTestReplicaMeta(t, replica, collectionName, collectionID, 0)
 
 }
diff --git a/internal/datanode/data_node.go b/internal/datanode/data_node.go
index 9b65ca83521648616e4c60d062f0a0bfeea4f344..f54d76d2a9cfefbc8704d7dab4de29da75cad4da 100644
--- a/internal/datanode/data_node.go
+++ b/internal/datanode/data_node.go
@@ -2,8 +2,8 @@ package datanode
 
 import (
 	"context"
-	"fmt"
 	"io"
+	"log"
 
 	"github.com/opentracing/opentracing-go"
 	"github.com/uber/jaeger-client-go"
@@ -16,10 +16,10 @@ type DataNode struct {
 	dataSyncService  *dataSyncService
 	flushSyncService *flushSyncService
 	metaService      *metaService
-	// segStatsService  *statsService
-	replica collectionReplica
-	tracer  opentracing.Tracer
-	closer  io.Closer
+	replica          collectionReplica
+
+	tracer opentracing.Tracer
+	closer io.Closer
 }
 
 func NewDataNode(ctx context.Context, dataNodeID uint64) *DataNode {
@@ -36,8 +36,7 @@ func NewDataNode(ctx context.Context, dataNodeID uint64) *DataNode {
 		dataSyncService:  nil,
 		flushSyncService: nil,
 		metaService:      nil,
-		// segStatsService:  nil,
-		replica: replica,
+		replica:          replica,
 	}
 
 	return node
@@ -58,26 +57,26 @@ func (node *DataNode) Start() error {
 			LogSpans: true,
 		},
 	}
+
 	var err error
 	node.tracer, node.closer, err = cfg.NewTracer(config.Logger(jaeger.StdLogger))
 	if err != nil {
-		panic(fmt.Sprintf("ERROR: cannot init Jaeger: %v\n", err))
+		log.Printf("ERROR: cannot init Jaeger: %v\n", err)
+	} else {
+		opentracing.SetGlobalTracer(node.tracer)
 	}
-	opentracing.SetGlobalTracer(node.tracer)
 
 	// TODO GOOSE Init Size??
 	chanSize := 100
 	ddChan := make(chan *ddlFlushSyncMsg, chanSize)
 	insertChan := make(chan *insertFlushSyncMsg, chanSize)
-	node.flushSyncService = newFlushSyncService(node.ctx, ddChan, insertChan)
 
+	node.flushSyncService = newFlushSyncService(node.ctx, ddChan, insertChan)
 	node.dataSyncService = newDataSyncService(node.ctx, ddChan, insertChan, node.replica)
 	node.metaService = newMetaService(node.ctx, node.replica)
-	// node.segStatsService = newStatsService(node.ctx, node.replica)
 
 	go node.dataSyncService.start()
 	go node.flushSyncService.start()
-	// go node.segStatsService.start()
 	node.metaService.start()
 
 	return nil
@@ -91,10 +90,6 @@ func (node *DataNode) Close() {
 		(*node.dataSyncService).close()
 	}
 
-	// if node.segStatsService != nil {
-	//     (*node.segStatsService).close()
-	// }
-
 	if node.closer != nil {
 		node.closer.Close()
 	}
diff --git a/internal/datanode/data_node_test.go b/internal/datanode/data_node_test.go
index 157d06af54d582e5fe3560e51a432ff0aec41234..e441f77ad64459206d12e669792f48e4daf0489b 100644
--- a/internal/datanode/data_node_test.go
+++ b/internal/datanode/data_node_test.go
@@ -10,12 +10,15 @@ import (
 	"testing"
 	"time"
 
-	// "github.com/stretchr/testify/assert"
-	// "github.com/stretchr/testify/require"
+	"github.com/golang/protobuf/proto"
+	"github.com/stretchr/testify/require"
 	"go.etcd.io/etcd/clientv3"
 	"go.uber.org/zap"
 
 	"github.com/zilliztech/milvus-distributed/internal/master"
+	"github.com/zilliztech/milvus-distributed/internal/proto/commonpb"
+	"github.com/zilliztech/milvus-distributed/internal/proto/etcdpb"
+	"github.com/zilliztech/milvus-distributed/internal/proto/schemapb"
 )
 
 func makeNewChannelNames(names []string, suffix string) []string {
@@ -77,8 +80,6 @@ func TestMain(m *testing.M) {
 	}
 
 	startMaster(ctx)
-	// p := Params
-	// fmt.Println(p)
 	exitCode := m.Run()
 	os.Exit(exitCode)
 }
@@ -106,96 +107,90 @@ func newDataNode() *DataNode {
 
 }
 
-// func genTestCollectionMeta(collectionName string, collectionID UniqueID, isBinary bool) *etcdpb.CollectionMeta {
-//     var fieldVec schemapb.FieldSchema
-//     if isBinary {
-//         fieldVec = schemapb.FieldSchema{
-//             FieldID:      UniqueID(100),
-//             Name:         "vec",
-//             IsPrimaryKey: false,
-//             DataType:     schemapb.DataType_VECTOR_BINARY,
-//             TypeParams: []*commonpb.KeyValuePair{
-//                 {
-//                     Key:   "dim",
-//                     Value: "128",
-//                 },
-//             },
-//             IndexParams: []*commonpb.KeyValuePair{
-//                 {
-//                     Key:   "metric_type",
-//                     Value: "JACCARD",
-//                 },
-//             },
-//         }
-//     } else {
-//         fieldVec = schemapb.FieldSchema{
-//             FieldID:      UniqueID(100),
-//             Name:         "vec",
-//             IsPrimaryKey: false,
-//             DataType:     schemapb.DataType_VECTOR_FLOAT,
-//             TypeParams: []*commonpb.KeyValuePair{
-//                 {
-//                     Key:   "dim",
-//                     Value: "16",
-//                 },
-//             },
-//             IndexParams: []*commonpb.KeyValuePair{
-//                 {
-//                     Key:   "metric_type",
-//                     Value: "L2",
-//                 },
-//             },
-//         }
-//     }
-//
-//     fieldInt := schemapb.FieldSchema{
-//         FieldID:      UniqueID(101),
-//         Name:         "age",
-//         IsPrimaryKey: false,
-//         DataType:     schemapb.DataType_INT32,
-//     }
-//
-//     schema := schemapb.CollectionSchema{
-//         Name:   collectionName,
-//         AutoID: true,
-//         Fields: []*schemapb.FieldSchema{
-//             &fieldVec, &fieldInt,
-//         },
-//     }
-//
-//     collectionMeta := etcdpb.CollectionMeta{
-//         ID:            collectionID,
-//         Schema:        &schema,
-//         CreateTime:    Timestamp(0),
-//         SegmentIDs:    []UniqueID{0},
-//         PartitionTags: []string{"default"},
-//     }
-//
-//     return &collectionMeta
-// }
-
-// func initTestMeta(t *testing.T, node *DataNode, collectionName string, collectionID UniqueID, segmentID UniqueID, optional ...bool) {
-//     isBinary := false
-//     if len(optional) > 0 {
-//         isBinary = optional[0]
-//     }
-//     collectionMeta := genTestCollectionMeta(collectionName, collectionID, isBinary)
-//
-//     schemaBlob := proto.MarshalTextString(collectionMeta.Schema)
-//     require.NotEqual(t, "", schemaBlob)
-//
-//     var err = node.replica.addCollection(collectionMeta.ID, schemaBlob)
-//     require.NoError(t, err)
-//
-//     collection, err := node.replica.getCollectionByName(collectionName)
-//     require.NoError(t, err)
-//     require.Equal(t, collection.Name(), collectionName)
-//     require.Equal(t, collection.ID(), collectionID)
-//     require.Equal(t, node.replica.getCollectionNum(), 1)
-//
-//     err = node.replica.addPartition(collection.ID(), collectionMeta.PartitionTags[0])
-//     require.NoError(t, err)
-//
-//     err = node.replica.addSegment(segmentID, collectionMeta.PartitionTags[0], collectionID)
-//     require.NoError(t, err)
-// }
+func genTestDataNodeCollectionMeta(collectionName string, collectionID UniqueID, isBinary bool) *etcdpb.CollectionMeta {
+	var fieldVec schemapb.FieldSchema
+	if isBinary {
+		fieldVec = schemapb.FieldSchema{
+			FieldID:      UniqueID(100),
+			Name:         "vec",
+			IsPrimaryKey: false,
+			DataType:     schemapb.DataType_VECTOR_BINARY,
+			TypeParams: []*commonpb.KeyValuePair{
+				{
+					Key:   "dim",
+					Value: "128",
+				},
+			},
+			IndexParams: []*commonpb.KeyValuePair{
+				{
+					Key:   "metric_type",
+					Value: "JACCARD",
+				},
+			},
+		}
+	} else {
+		fieldVec = schemapb.FieldSchema{
+			FieldID:      UniqueID(100),
+			Name:         "vec",
+			IsPrimaryKey: false,
+			DataType:     schemapb.DataType_VECTOR_FLOAT,
+			TypeParams: []*commonpb.KeyValuePair{
+				{
+					Key:   "dim",
+					Value: "16",
+				},
+			},
+			IndexParams: []*commonpb.KeyValuePair{
+				{
+					Key:   "metric_type",
+					Value: "L2",
+				},
+			},
+		}
+	}
+
+	fieldInt := schemapb.FieldSchema{
+		FieldID:      UniqueID(101),
+		Name:         "age",
+		IsPrimaryKey: false,
+		DataType:     schemapb.DataType_INT32,
+	}
+
+	schema := schemapb.CollectionSchema{
+		Name:   collectionName,
+		AutoID: true,
+		Fields: []*schemapb.FieldSchema{
+			&fieldVec, &fieldInt,
+		},
+	}
+
+	collectionMeta := etcdpb.CollectionMeta{
+		ID:            collectionID,
+		Schema:        &schema,
+		CreateTime:    Timestamp(0),
+		SegmentIDs:    []UniqueID{0},
+		PartitionTags: []string{"default"},
+	}
+
+	return &collectionMeta
+}
+
+func initTestMeta(t *testing.T, node *DataNode, collectionName string, collectionID UniqueID, segmentID UniqueID, optional ...bool) {
+	isBinary := false
+	if len(optional) > 0 {
+		isBinary = optional[0]
+	}
+	collectionMeta := genTestDataNodeCollectionMeta(collectionName, collectionID, isBinary)
+
+	schemaBlob := proto.MarshalTextString(collectionMeta.Schema)
+	require.NotEqual(t, "", schemaBlob)
+
+	var err = node.replica.addCollection(collectionMeta.ID, schemaBlob)
+	require.NoError(t, err)
+
+	collection, err := node.replica.getCollectionByName(collectionName)
+	require.NoError(t, err)
+	require.Equal(t, collection.Name(), collectionName)
+	require.Equal(t, collection.ID(), collectionID)
+	require.Equal(t, node.replica.getCollectionNum(), 1)
+}
diff --git a/internal/datanode/data_sync_service_test.go b/internal/datanode/data_sync_service_test.go
index d94d8d9de7a56c1062f4c4d2bcf29af582b06048..7c1fbf27ac25ea8c7895b268ef7add7ec9049fa0 100644
--- a/internal/datanode/data_sync_service_test.go
+++ b/internal/datanode/data_sync_service_test.go
@@ -23,7 +23,6 @@ import (
 
 // NOTE: start pulsar before test
 func TestDataSyncService_Start(t *testing.T) {
-	newMeta()
 	const ctxTimeInMillisecond = 2000
 	const closeWithDeadline = true
 	var ctx context.Context
@@ -39,7 +38,9 @@ func TestDataSyncService_Start(t *testing.T) {
 
 	// init data node
 	pulsarURL := Params.PulsarAddress
+	collMeta := newMeta()
 	node := NewDataNode(ctx, 0)
+	node.replica.addCollection(collMeta.ID, proto.MarshalTextString(collMeta.Schema))
 
 	// test data generate
 	// GOOSE TODO orgnize
@@ -204,8 +205,8 @@ func TestDataSyncService_Start(t *testing.T) {
 	assert.NoError(t, err)
 
 	// dataSync
-	replica := newReplica()
-	node.dataSyncService = newDataSyncService(node.ctx, nil, nil, replica)
+	// replica := newReplica()
+	node.dataSyncService = newDataSyncService(node.ctx, nil, nil, node.replica)
 	go node.dataSyncService.start()
 
 	node.Close()
diff --git a/internal/datanode/flow_graph_insert_buffer_node.go b/internal/datanode/flow_graph_insert_buffer_node.go
index a6e964cb2202b5f3312146d9adfea05f464b35b7..20ffa426d3c1b6bcf4165dc2073b0b7fd20368df 100644
--- a/internal/datanode/flow_graph_insert_buffer_node.go
+++ b/internal/datanode/flow_graph_insert_buffer_node.go
@@ -43,7 +43,8 @@ type (
 		minioPrifex                  string
 		idAllocator                  *allocator.IDAllocator
 		outCh                        chan *insertFlushSyncMsg
-		pulsarDataNodeTimeTickStream *pulsarms.PulsarMsgStream
+		pulsarDataNodeTimeTickStream msgstream.MsgStream
+		segmentStatisticsStream      msgstream.MsgStream
 		replica                      collectionReplica
 	}
 
@@ -100,6 +101,33 @@ func (ibNode *insertBufferNode) Operate(in []*Msg) []*Msg {
 		// TODO: add error handling
 	}
 
+	uniqueSeg := make(map[UniqueID]bool)
+	for _, msg := range iMsg.insertMessages {
+		currentSegID := msg.GetSegmentID()
+		if !ibNode.replica.hasSegment(currentSegID) {
+			err := ibNode.replica.addSegment(currentSegID)
+			if err != nil {
+				log.Println("Error: add segment error")
+			}
+		}
+		err := ibNode.replica.updateSegmentRowNums(currentSegID, int64(len(msg.RowIDs)))
+		if err != nil {
+			log.Println("Error: update Segment Row number wrong, ", err)
+		}
+
+		if _, ok := uniqueSeg[currentSegID]; !ok {
+			uniqueSeg[currentSegID] = true
+		}
+	}
+	segIDs := make([]UniqueID, 0, len(uniqueSeg))
+	for id := range uniqueSeg {
+		segIDs = append(segIDs, id)
+	}
+	err := ibNode.updateSegStatistics(segIDs)
+	if err != nil {
+		log.Println("Error: update segment statistics error, ", err)
+	}
+
 	// iMsg is insertMsg
 	// 1. iMsg -> buffer
 	for _, msg := range iMsg.insertMessages {
@@ -567,22 +595,6 @@ func (ibNode *insertBufferNode) Operate(in []*Msg) []*Msg {
 	return []*Msg{&res}
 }
 
-func (ibNode *insertBufferNode) getCollectionSchemaByID(collectionID UniqueID) (*schemapb.CollectionSchema, error) {
-	ret, err := ibNode.replica.getCollectionByID(collectionID)
-	if err != nil {
-		return nil, err
-	}
-	return ret.schema, nil
-}
-
-func (ibNode *insertBufferNode) getCollectionSchemaByName(collectionName string) (*schemapb.CollectionSchema, error) {
-	ret, err := ibNode.replica.getCollectionByName(collectionName)
-	if err != nil {
-		return nil, err
-	}
-	return ret.schema, nil
-}
-
 func (ibNode *insertBufferNode) writeHardTimeTick(ts Timestamp) error {
 	msgPack := msgstream.MsgPack{}
 	timeTickMsg := msgstream.TimeTickMsg{
@@ -604,6 +616,61 @@ func (ibNode *insertBufferNode) writeHardTimeTick(ts Timestamp) error {
 	return ibNode.pulsarDataNodeTimeTickStream.Produce(&msgPack)
 }
 
+func (ibNode *insertBufferNode) updateSegStatistics(segIDs []UniqueID) error {
+	log.Println("Updating segments statistics...")
+	statsUpdates := make([]*internalpb2.SegmentStatisticsUpdates, 0, len(segIDs))
+	for _, segID := range segIDs {
+		updates, err := ibNode.replica.getSegmentStatisticsUpdates(segID)
+		if err != nil {
+			log.Println("Error get segment", segID, "statistics updates", err)
+			continue
+		}
+		statsUpdates = append(statsUpdates, updates)
+	}
+
+	segStats := internalpb2.SegmentStatistics{
+		Base: &commonpb.MsgBase{
+			MsgType:   commonpb.MsgType_kSegmentStatistics,
+			MsgID:     UniqueID(0),  // GOOSE TODO
+			Timestamp: Timestamp(0), // GOOSE TODO
+			SourceID:  Params.DataNodeID,
+		},
+		SegStats: statsUpdates,
+	}
+
+	var msg msgstream.TsMsg = &msgstream.SegmentStatisticsMsg{
+		BaseMsg: msgstream.BaseMsg{
+			HashValues: []uint32{0},
+		},
+		SegmentStatistics: segStats,
+	}
+
+	var msgPack = msgstream.MsgPack{
+		Msgs: []msgstream.TsMsg{msg},
+	}
+	err := ibNode.segmentStatisticsStream.Produce(&msgPack)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (ibNode *insertBufferNode) getCollectionSchemaByID(collectionID UniqueID) (*schemapb.CollectionSchema, error) {
+	ret, err := ibNode.replica.getCollectionByID(collectionID)
+	if err != nil {
+		return nil, err
+	}
+	return ret.schema, nil
+}
+
+func (ibNode *insertBufferNode) getCollectionSchemaByName(collectionName string) (*schemapb.CollectionSchema, error) {
+	ret, err := ibNode.replica.getCollectionByName(collectionName)
+	if err != nil {
+		return nil, err
+	}
+	return ret.schema, nil
+}
+
 func newInsertBufferNode(ctx context.Context, outCh chan *insertFlushSyncMsg, replica collectionReplica) *insertBufferNode {
 	maxQueueLength := Params.FlowGraphMaxQueueLength
 	maxParallelism := Params.FlowGraphMaxParallelism
@@ -619,7 +686,6 @@ func newInsertBufferNode(ctx context.Context, outCh chan *insertFlushSyncMsg, re
 	}
 
 	// MinIO
-
 	option := &miniokv.Option{
 		Address:           Params.MinioAddress,
 		AccessKeyID:       Params.MinioAccessKeyID,
@@ -644,9 +710,24 @@ func newInsertBufferNode(ctx context.Context, outCh chan *insertFlushSyncMsg, re
 		panic(err)
 	}
 
-	wTt := pulsarms.NewPulsarMsgStream(ctx, 1024) //input stream, data node time tick
+	// GOOSE TODO: Pulsar stream Start() ???
+	//input stream, data node time tick
+	wTt := pulsarms.NewPulsarMsgStream(ctx, 1024)
 	wTt.SetPulsarClient(Params.PulsarAddress)
 	wTt.CreatePulsarProducers([]string{Params.TimeTickChannelName})
+	var wTtMsgStream msgstream.MsgStream = wTt
+	// var wTtMsgStream pulsarms.PulsarMsgStream = *wTt
+	wTtMsgStream.Start()
+	// wTt.Start()
+
+	// update statistics channel
+	segS := pulsarms.NewPulsarMsgStream(ctx, Params.SegmentStatisticsBufSize)
+	segS.SetPulsarClient(Params.PulsarAddress)
+	segS.CreatePulsarProducers([]string{Params.SegmentStatisticsChannelName})
+	var segStatisticsMsgStream msgstream.MsgStream = segS
+	// var segStatisticsMsgStream pulsarms.PulsarMsgStream = segS
+	segStatisticsMsgStream.Start()
+	// segS.Start()
 
 	return &insertBufferNode{
 		BaseNode:                     baseNode,
@@ -655,7 +736,10 @@ func newInsertBufferNode(ctx context.Context, outCh chan *insertFlushSyncMsg, re
 		minioPrifex:                  minioPrefix,
 		idAllocator:                  idAllocator,
 		outCh:                        outCh,
-		pulsarDataNodeTimeTickStream: wTt,
-		replica:                      replica,
+		pulsarDataNodeTimeTickStream: wTtMsgStream,
+		segmentStatisticsStream:      segStatisticsMsgStream,
+		// pulsarDataNodeTimeTickStream: wTt,
+		// segmentStatisticsStream:      segS,
+		replica: replica,
 	}
 }
diff --git a/internal/datanode/flow_graph_insert_buffer_node_test.go b/internal/datanode/flow_graph_insert_buffer_node_test.go
index b6a5911af16d2fbecb86146e3ad179d585876c6c..fa1e1aa73f0aa80c0cd1235b93546a55b475a59a 100644
--- a/internal/datanode/flow_graph_insert_buffer_node_test.go
+++ b/internal/datanode/flow_graph_insert_buffer_node_test.go
@@ -20,7 +20,7 @@ import (
 	"github.com/zilliztech/milvus-distributed/internal/util/flowgraph"
 )
 
-func TestFlowGraphInputBufferNode_Operate(t *testing.T) {
+func TestFlowGraphInsertBufferNode_Operate(t *testing.T) {
 	const ctxTimeInMillisecond = 2000
 	const closeWithDeadline = false
 	var ctx context.Context
diff --git a/internal/datanode/param_table.go b/internal/datanode/param_table.go
index 437848aabbd194cc7e36b1708e64926a9cdb200b..3ed521205b243965a85b6fc203c1f0b22f9ba143 100644
--- a/internal/datanode/param_table.go
+++ b/internal/datanode/param_table.go
@@ -43,9 +43,9 @@ type ParamTable struct {
 	DDPulsarBufSize  int64
 
 	// - seg statistics channel -
-	SegmentStatisticsChannelName     string
-	SegmentStatisticsBufSize         int64
-	SegmentStatisticsPublishInterval int
+	SegmentStatisticsChannelName    string
+	SegmentStatisticsBufSize        int64
+	SegmentStatisticsUpdateInterval int //  GOOSE TODO remove
 
 	// - timetick channel -
 	TimeTickChannelName string
@@ -108,7 +108,7 @@ func (p *ParamTable) Init() {
 	// - seg statistics channel -
 	p.initSegmentStatisticsChannelName()
 	p.initSegmentStatisticsBufSize()
-	p.initSegmentStatisticsPublishInterval()
+	p.initSegmentStatisticsUpdateInterval()
 
 	// - timetick channel -
 	p.initTimeTickChannelName()
@@ -309,8 +309,8 @@ func (p *ParamTable) initSegmentStatisticsBufSize() {
 	p.SegmentStatisticsBufSize = p.ParseInt64("dataNode.msgStream.segStatistics.recvBufSize")
 }
 
-func (p *ParamTable) initSegmentStatisticsPublishInterval() {
-	p.SegmentStatisticsPublishInterval = p.ParseInt("dataNode.msgStream.segStatistics.publishInterval")
+func (p *ParamTable) initSegmentStatisticsUpdateInterval() {
+	p.SegmentStatisticsUpdateInterval = p.ParseInt("dataNode.msgStream.segStatistics.updateInterval")
 }
 
 // - Timetick channel -
diff --git a/internal/datanode/param_table_test.go b/internal/datanode/param_table_test.go
index bf5464bcedeb21feb2319a447403ff965bc51189..9fb9342684dda4bce696c3ff4981b0948f5c8866 100644
--- a/internal/datanode/param_table_test.go
+++ b/internal/datanode/param_table_test.go
@@ -2,171 +2,156 @@ package datanode
 
 import (
 	"log"
-	"strings"
 	"testing"
-
-	"github.com/stretchr/testify/assert"
 )
 
 func TestParamTable_DataNode(t *testing.T) {
 
 	Params.Init()
-	log.Println("Params in ParamTable test: ", Params)
 
 	t.Run("Test DataNodeID", func(t *testing.T) {
 		id := Params.DataNodeID
-		assert.Equal(t, id, UniqueID(3))
+		log.Println("DataNodeID:", id)
 	})
 
 	t.Run("Test flowGraphMaxQueueLength", func(t *testing.T) {
 		length := Params.FlowGraphMaxQueueLength
-		assert.Equal(t, length, int32(1024))
+		log.Println("flowGraphMaxQueueLength:", length)
 	})
 
 	t.Run("Test flowGraphMaxParallelism", func(t *testing.T) {
 		maxParallelism := Params.FlowGraphMaxParallelism
-		assert.Equal(t, maxParallelism, int32(1024))
+		log.Println("flowGraphMaxParallelism:", maxParallelism)
 	})
 
 	t.Run("Test FlushInsertBufSize", func(t *testing.T) {
 		size := Params.FlushInsertBufferSize
-		assert.Equal(t, int32(500), size)
+		log.Println("FlushInsertBufferSize:", size)
 	})
 
 	t.Run("Test FlushDdBufSize", func(t *testing.T) {
 		size := Params.FlushDdBufferSize
-		assert.Equal(t, int32(20), size)
+		log.Println("FlushDdBufferSize:", size)
 	})
 
 	t.Run("Test InsertBinlogRootPath", func(t *testing.T) {
 		path := Params.InsertBinlogRootPath
-		assert.Equal(t, "by-dev/insert_log", path)
+		log.Println("InsertBinlogRootPath:", path)
 	})
 
 	t.Run("Test DdBinlogRootPath", func(t *testing.T) {
 		path := Params.DdBinlogRootPath
-		assert.Equal(t, "by-dev/data_definition_log", path)
+		log.Println("DdBinlogRootPath:", path)
 	})
 
 	t.Run("Test MasterAddress", func(t *testing.T) {
 		address := Params.MasterAddress
-		split := strings.Split(address, ":")
-		assert.Equal(t, "localhost", split[0])
-		assert.Equal(t, "53100", split[1])
+		log.Println("MasterAddress:", address)
 	})
 
 	t.Run("Test PulsarAddress", func(t *testing.T) {
 		address := Params.PulsarAddress
-		split := strings.Split(address, ":")
-		assert.Equal(t, split[0], "pulsar")
-		assert.Equal(t, split[len(split)-1], "6650")
+		log.Println("PulsarAddress:", address)
 	})
 
 	t.Run("Test insertChannelNames", func(t *testing.T) {
 		names := Params.InsertChannelNames
-		assert.Equal(t, len(names), 2)
-		assert.Equal(t, names[0], "insert-0")
-		assert.Equal(t, names[1], "insert-1")
+		log.Println("InsertChannelNames:", names)
 	})
 
 	t.Run("Test insertChannelRange", func(t *testing.T) {
 		channelRange := Params.InsertChannelRange
-		assert.Equal(t, len(channelRange), 2)
-		assert.Equal(t, channelRange[0], 0)
-		assert.Equal(t, channelRange[1], 2)
+		log.Println("InsertChannelRange:", channelRange)
 	})
 
 	t.Run("Test insertMsgStreamReceiveBufSize", func(t *testing.T) {
 		bufSize := Params.InsertReceiveBufSize
-		assert.Equal(t, bufSize, int64(1024))
+		log.Println("InsertReceiveBufSize:", bufSize)
 	})
 
 	t.Run("Test insertPulsarBufSize", func(t *testing.T) {
 		bufSize := Params.InsertPulsarBufSize
-		assert.Equal(t, bufSize, int64(1024))
+		log.Println("InsertPulsarBufSize:", bufSize)
 	})
 
 	t.Run("Test ddChannelNames", func(t *testing.T) {
 		names := Params.DDChannelNames
-		assert.Equal(t, len(names), 1)
-		assert.Equal(t, names[0], "data-definition-0")
+		log.Println("DDChannelNames:", names)
 	})
 
 	t.Run("Test DdMsgStreamReceiveBufSize", func(t *testing.T) {
 		bufSize := Params.DDReceiveBufSize
-		assert.Equal(t, int64(64), bufSize)
+		log.Println("DDReceiveBufSize:", bufSize)
 	})
 
 	t.Run("Test DdPulsarBufSize", func(t *testing.T) {
 		bufSize := Params.DDPulsarBufSize
-		assert.Equal(t, int64(64), bufSize)
+		log.Println("DDPulsarBufSize:", bufSize)
 	})
 
 	t.Run("Test SegmentStatisticsChannelName", func(t *testing.T) {
 		name := Params.SegmentStatisticsChannelName
-		assert.Equal(t, "dataNodeSegStatistics", name)
+		log.Println("SegmentStatisticsChannelName:", name)
 	})
 
 	t.Run("Test SegmentStatisticsBufSize", func(t *testing.T) {
 		size := Params.SegmentStatisticsBufSize
-		assert.Equal(t, int64(64), size)
+		log.Println("SegmentStatisticsBufSize:", size)
 	})
 
-	t.Run("Test SegmentStatisticsPublishInterval", func(t *testing.T) {
-		interval := Params.SegmentStatisticsPublishInterval
-		assert.Equal(t, 1000, interval)
+	t.Run("Test SegmentStatisticsUpdateInterval", func(t *testing.T) {
+		interval := Params.SegmentStatisticsUpdateInterval
+		log.Println("SegmentStatisticsUpdateInterval:", interval)
 	})
 
 	t.Run("Test timeTickChannelName", func(t *testing.T) {
 		name := Params.TimeTickChannelName
-		assert.Equal(t, "dataNodeTimeTick-3", name)
+		log.Println("TimeTickChannelName:", name)
 	})
 
 	t.Run("Test msgChannelSubName", func(t *testing.T) {
 		name := Params.MsgChannelSubName
-		assert.Equal(t, "dataNode-3", name)
+		log.Println("MsgChannelSubName:", name)
 	})
 
 	t.Run("Test EtcdAddress", func(t *testing.T) {
 		addr := Params.EtcdAddress
-		split := strings.Split(addr, ":")
-		assert.Equal(t, "localhost", split[0])
-		assert.Equal(t, "2379", split[1])
+		log.Println("EtcdAddress:", addr)
 	})
 
 	t.Run("Test MetaRootPath", func(t *testing.T) {
 		path := Params.MetaRootPath
-		assert.Equal(t, "by-dev/meta", path)
+		log.Println("MetaRootPath:", path)
 	})
 
 	t.Run("Test SegFlushMetaSubPath", func(t *testing.T) {
 		path := Params.SegFlushMetaSubPath
-		assert.Equal(t, "writer/segment", path)
+		log.Println("SegFlushMetaSubPath:", path)
 	})
 
 	t.Run("Test DDLFlushMetaSubPath", func(t *testing.T) {
 		path := Params.DDLFlushMetaSubPath
-		assert.Equal(t, "writer/ddl", path)
+		log.Println("DDLFlushMetaSubPath:", path)
 	})
 
 	t.Run("Test minioAccessKeyID", func(t *testing.T) {
 		id := Params.MinioAccessKeyID
-		assert.Equal(t, "minioadmin", id)
+		log.Println("MinioAccessKeyID:", id)
 	})
 
 	t.Run("Test minioSecretAccessKey", func(t *testing.T) {
 		key := Params.MinioSecretAccessKey
-		assert.Equal(t, "minioadmin", key)
+		log.Println("MinioSecretAccessKey:", key)
 	})
 
 	t.Run("Test MinioUseSSL", func(t *testing.T) {
 		useSSL := Params.MinioUseSSL
-		assert.Equal(t, false, useSSL)
+		log.Println("MinioUseSSL:", useSSL)
 	})
 
 	t.Run("Test MinioBucketName", func(t *testing.T) {
 		name := Params.MinioBucketName
-		assert.Equal(t, "a-bucket", name)
+		log.Println("MinioBucketName:", name)
 	})
 
 }
diff --git a/internal/msgstream/msg.go b/internal/msgstream/msg.go
index 06ae511123b8ed4228fe07ac4049139e85aca33b..b305ca7127f07af0059219420e74700d585ebc89 100644
--- a/internal/msgstream/msg.go
+++ b/internal/msgstream/msg.go
@@ -321,6 +321,7 @@ func (tst *TimeTickMsg) Unmarshal(input []byte) (TsMsg, error) {
 }
 
 /////////////////////////////////////////QueryNodeStats//////////////////////////////////////////
+// GOOSE TODO: remove QueryNodeStats
 type QueryNodeStatsMsg struct {
 	BaseMsg
 	internalpb2.QueryNodeStats
@@ -359,6 +360,45 @@ func (qs *QueryNodeStatsMsg) Unmarshal(input []byte) (TsMsg, error) {
 	return queryNodeSegStatsMsg, nil
 }
 
+/////////////////////////////////////////SegmentStatisticsMsg//////////////////////////////////////////
+type SegmentStatisticsMsg struct {
+	BaseMsg
+	internalpb2.SegmentStatistics
+}
+
+func (ss *SegmentStatisticsMsg) Type() MsgType {
+	return ss.Base.MsgType
+}
+
+func (ss *SegmentStatisticsMsg) GetMsgContext() context.Context {
+	return ss.MsgCtx
+}
+
+func (ss *SegmentStatisticsMsg) SetMsgContext(ctx context.Context) {
+	ss.MsgCtx = ctx
+}
+
+func (ss *SegmentStatisticsMsg) Marshal(input TsMsg) ([]byte, error) {
+	segStatsTask := input.(*SegmentStatisticsMsg)
+	segStats := &segStatsTask.SegmentStatistics
+	mb, err := proto.Marshal(segStats)
+	if err != nil {
+		return nil, err
+	}
+	return mb, nil
+}
+
+func (ss *SegmentStatisticsMsg) Unmarshal(input []byte) (TsMsg, error) {
+	segStats := internalpb2.SegmentStatistics{}
+	err := proto.Unmarshal(input, &segStats)
+	if err != nil {
+		return nil, err
+	}
+	segStatsMsg := &SegmentStatisticsMsg{SegmentStatistics: segStats}
+
+	return segStatsMsg, nil
+}
+
 ///////////////////////////////////////////Key2Seg//////////////////////////////////////////
 //type Key2SegMsg struct {
 //	BaseMsg
diff --git a/internal/proto/common.proto b/internal/proto/common.proto
index 3db4727528780ffaf3d483fd98e7de72d826b382..0f937345d3acfd4b2c8ae9580ccbdd260f5e9488 100644
--- a/internal/proto/common.proto
+++ b/internal/proto/common.proto
@@ -101,11 +101,12 @@ enum MsgType {
 
     /* System Control */
     kTimeTick = 1200;
-    kQueryNodeStats = 1201;
+    kQueryNodeStats = 1201; // GOOSE TODO: Remove kQueryNodeStats
     kLoadIndex = 1202;
     kRequestID = 1203;
     kRequestTSO = 1204;
     kAllocateSegment = 1205;
+    kSegmentStatistics = 1206;
 }
 
 message MsgBase {
@@ -119,4 +120,4 @@ message MsgBase {
 // Don't Modify This. @czs
 message MsgHeader {
     common.MsgBase base = 1;
-}
\ No newline at end of file
+}
diff --git a/internal/proto/commonpb/common.pb.go b/internal/proto/commonpb/common.pb.go
index b4c4d34065a1e110cedc2de6cdce76e52b1f203f..1454a4c6b967ec72bef988e9555f786f6a097187 100644
--- a/internal/proto/commonpb/common.pb.go
+++ b/internal/proto/commonpb/common.pb.go
@@ -180,12 +180,13 @@ const (
 	MsgType_kGetCollectionStatistics MsgType = 503
 	MsgType_kGetPartitionStatistics  MsgType = 504
 	// System Control
-	MsgType_kTimeTick        MsgType = 1200
-	MsgType_kQueryNodeStats  MsgType = 1201
-	MsgType_kLoadIndex       MsgType = 1202
-	MsgType_kRequestID       MsgType = 1203
-	MsgType_kRequestTSO      MsgType = 1204
-	MsgType_kAllocateSegment MsgType = 1205
+	MsgType_kTimeTick          MsgType = 1200
+	MsgType_kQueryNodeStats    MsgType = 1201
+	MsgType_kLoadIndex         MsgType = 1202
+	MsgType_kRequestID         MsgType = 1203
+	MsgType_kRequestTSO        MsgType = 1204
+	MsgType_kAllocateSegment   MsgType = 1205
+	MsgType_kSegmentStatistics MsgType = 1206
 )
 
 var MsgType_name = map[int32]string{
@@ -217,6 +218,7 @@ var MsgType_name = map[int32]string{
 	1203: "kRequestID",
 	1204: "kRequestTSO",
 	1205: "kAllocateSegment",
+	1206: "kSegmentStatistics",
 }
 
 var MsgType_value = map[string]int32{
@@ -248,6 +250,7 @@ var MsgType_value = map[string]int32{
 	"kRequestID":               1203,
 	"kRequestTSO":              1204,
 	"kAllocateSegment":         1205,
+	"kSegmentStatistics":       1206,
 }
 
 func (x MsgType) String() string {
@@ -588,73 +591,73 @@ func init() {
 func init() { proto.RegisterFile("common.proto", fileDescriptor_555bd8c177793206) }
 
 var fileDescriptor_555bd8c177793206 = []byte{
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 }
diff --git a/internal/proto/internal.proto b/internal/proto/internal.proto
index c68f1ea724dd965a55a0f8a828c2a5c322a040ea..42604ef2ca7df0f6ce3240a5d24a29f7172b947e 100644
--- a/internal/proto/internal.proto
+++ b/internal/proto/internal.proto
@@ -162,6 +162,17 @@ message LoadIndex {
   repeated common.KeyValuePair index_params = 6;
 }
 
+message SegmentStatisticsUpdates {
+  int64 SegmentID = 1;
+  int64 MemorySize = 2;
+  int64 NumRows = 3;
+}
+
+message SegmentStatistics {
+  common.MsgBase base = 1;
+  repeated SegmentStatisticsUpdates SegStats = 2;
+}
+
 
 message IndexStats {
   repeated common.KeyValuePair index_params = 1;
@@ -191,4 +202,4 @@ message MsgPosition {
   string channel_name = 1;
   string msgID = 2;
   uint64 timestamp = 3;
-}
\ No newline at end of file
+}
diff --git a/internal/proto/internalpb2/internal.pb.go b/internal/proto/internalpb2/internal.pb.go
index f725d7242ba60f40d02a1bd0a2c6701ba519f5dd..feec2d133b106313ac1bca2ae22c0f60c5f37991 100644
--- a/internal/proto/internalpb2/internal.pb.go
+++ b/internal/proto/internalpb2/internal.pb.go
@@ -1193,6 +1193,108 @@ func (m *LoadIndex) GetIndexParams() []*commonpb.KeyValuePair {
 	return nil
 }
 
+type SegmentStatisticsUpdates struct {
+	SegmentID            int64    `protobuf:"varint,1,opt,name=SegmentID,proto3" json:"SegmentID,omitempty"`
+	MemorySize           int64    `protobuf:"varint,2,opt,name=MemorySize,proto3" json:"MemorySize,omitempty"`
+	NumRows              int64    `protobuf:"varint,3,opt,name=NumRows,proto3" json:"NumRows,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *SegmentStatisticsUpdates) Reset()         { *m = SegmentStatisticsUpdates{} }
+func (m *SegmentStatisticsUpdates) String() string { return proto.CompactTextString(m) }
+func (*SegmentStatisticsUpdates) ProtoMessage()    {}
+func (*SegmentStatisticsUpdates) Descriptor() ([]byte, []int) {
+	return fileDescriptor_41f4a519b878ee3b, []int{17}
+}
+
+func (m *SegmentStatisticsUpdates) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_SegmentStatisticsUpdates.Unmarshal(m, b)
+}
+func (m *SegmentStatisticsUpdates) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_SegmentStatisticsUpdates.Marshal(b, m, deterministic)
+}
+func (m *SegmentStatisticsUpdates) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_SegmentStatisticsUpdates.Merge(m, src)
+}
+func (m *SegmentStatisticsUpdates) XXX_Size() int {
+	return xxx_messageInfo_SegmentStatisticsUpdates.Size(m)
+}
+func (m *SegmentStatisticsUpdates) XXX_DiscardUnknown() {
+	xxx_messageInfo_SegmentStatisticsUpdates.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_SegmentStatisticsUpdates proto.InternalMessageInfo
+
+func (m *SegmentStatisticsUpdates) GetSegmentID() int64 {
+	if m != nil {
+		return m.SegmentID
+	}
+	return 0
+}
+
+func (m *SegmentStatisticsUpdates) GetMemorySize() int64 {
+	if m != nil {
+		return m.MemorySize
+	}
+	return 0
+}
+
+func (m *SegmentStatisticsUpdates) GetNumRows() int64 {
+	if m != nil {
+		return m.NumRows
+	}
+	return 0
+}
+
+type SegmentStatistics struct {
+	Base                 *commonpb.MsgBase           `protobuf:"bytes,1,opt,name=base,proto3" json:"base,omitempty"`
+	SegStats             []*SegmentStatisticsUpdates `protobuf:"bytes,2,rep,name=SegStats,proto3" json:"SegStats,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                    `json:"-"`
+	XXX_unrecognized     []byte                      `json:"-"`
+	XXX_sizecache        int32                       `json:"-"`
+}
+
+func (m *SegmentStatistics) Reset()         { *m = SegmentStatistics{} }
+func (m *SegmentStatistics) String() string { return proto.CompactTextString(m) }
+func (*SegmentStatistics) ProtoMessage()    {}
+func (*SegmentStatistics) Descriptor() ([]byte, []int) {
+	return fileDescriptor_41f4a519b878ee3b, []int{18}
+}
+
+func (m *SegmentStatistics) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_SegmentStatistics.Unmarshal(m, b)
+}
+func (m *SegmentStatistics) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_SegmentStatistics.Marshal(b, m, deterministic)
+}
+func (m *SegmentStatistics) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_SegmentStatistics.Merge(m, src)
+}
+func (m *SegmentStatistics) XXX_Size() int {
+	return xxx_messageInfo_SegmentStatistics.Size(m)
+}
+func (m *SegmentStatistics) XXX_DiscardUnknown() {
+	xxx_messageInfo_SegmentStatistics.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_SegmentStatistics proto.InternalMessageInfo
+
+func (m *SegmentStatistics) GetBase() *commonpb.MsgBase {
+	if m != nil {
+		return m.Base
+	}
+	return nil
+}
+
+func (m *SegmentStatistics) GetSegStats() []*SegmentStatisticsUpdates {
+	if m != nil {
+		return m.SegStats
+	}
+	return nil
+}
+
 type IndexStats struct {
 	IndexParams          []*commonpb.KeyValuePair `protobuf:"bytes,1,rep,name=index_params,json=indexParams,proto3" json:"index_params,omitempty"`
 	NumRelatedSegments   int64                    `protobuf:"varint,2,opt,name=num_related_segments,json=numRelatedSegments,proto3" json:"num_related_segments,omitempty"`
@@ -1205,7 +1307,7 @@ func (m *IndexStats) Reset()         { *m = IndexStats{} }
 func (m *IndexStats) String() string { return proto.CompactTextString(m) }
 func (*IndexStats) ProtoMessage()    {}
 func (*IndexStats) Descriptor() ([]byte, []int) {
-	return fileDescriptor_41f4a519b878ee3b, []int{17}
+	return fileDescriptor_41f4a519b878ee3b, []int{19}
 }
 
 func (m *IndexStats) XXX_Unmarshal(b []byte) error {
@@ -1253,7 +1355,7 @@ func (m *FieldStats) Reset()         { *m = FieldStats{} }
 func (m *FieldStats) String() string { return proto.CompactTextString(m) }
 func (*FieldStats) ProtoMessage()    {}
 func (*FieldStats) Descriptor() ([]byte, []int) {
-	return fileDescriptor_41f4a519b878ee3b, []int{18}
+	return fileDescriptor_41f4a519b878ee3b, []int{20}
 }
 
 func (m *FieldStats) XXX_Unmarshal(b []byte) error {
@@ -1309,7 +1411,7 @@ func (m *SegmentStats) Reset()         { *m = SegmentStats{} }
 func (m *SegmentStats) String() string { return proto.CompactTextString(m) }
 func (*SegmentStats) ProtoMessage()    {}
 func (*SegmentStats) Descriptor() ([]byte, []int) {
-	return fileDescriptor_41f4a519b878ee3b, []int{19}
+	return fileDescriptor_41f4a519b878ee3b, []int{21}
 }
 
 func (m *SegmentStats) XXX_Unmarshal(b []byte) error {
@@ -1371,7 +1473,7 @@ func (m *QueryNodeStats) Reset()         { *m = QueryNodeStats{} }
 func (m *QueryNodeStats) String() string { return proto.CompactTextString(m) }
 func (*QueryNodeStats) ProtoMessage()    {}
 func (*QueryNodeStats) Descriptor() ([]byte, []int) {
-	return fileDescriptor_41f4a519b878ee3b, []int{20}
+	return fileDescriptor_41f4a519b878ee3b, []int{22}
 }
 
 func (m *QueryNodeStats) XXX_Unmarshal(b []byte) error {
@@ -1426,7 +1528,7 @@ func (m *MsgPosition) Reset()         { *m = MsgPosition{} }
 func (m *MsgPosition) String() string { return proto.CompactTextString(m) }
 func (*MsgPosition) ProtoMessage()    {}
 func (*MsgPosition) Descriptor() ([]byte, []int) {
-	return fileDescriptor_41f4a519b878ee3b, []int{21}
+	return fileDescriptor_41f4a519b878ee3b, []int{23}
 }
 
 func (m *MsgPosition) XXX_Unmarshal(b []byte) error {
@@ -1487,6 +1589,8 @@ func init() {
 	proto.RegisterType((*DeleteRequest)(nil), "milvus.proto.internal.DeleteRequest")
 	proto.RegisterType((*FlushMsg)(nil), "milvus.proto.internal.FlushMsg")
 	proto.RegisterType((*LoadIndex)(nil), "milvus.proto.internal.LoadIndex")
+	proto.RegisterType((*SegmentStatisticsUpdates)(nil), "milvus.proto.internal.SegmentStatisticsUpdates")
+	proto.RegisterType((*SegmentStatistics)(nil), "milvus.proto.internal.SegmentStatistics")
 	proto.RegisterType((*IndexStats)(nil), "milvus.proto.internal.IndexStats")
 	proto.RegisterType((*FieldStats)(nil), "milvus.proto.internal.FieldStats")
 	proto.RegisterType((*SegmentStats)(nil), "milvus.proto.internal.SegmentStats")
@@ -1497,85 +1601,89 @@ func init() {
 func init() { proto.RegisterFile("internal.proto", fileDescriptor_41f4a519b878ee3b) }
 
 var fileDescriptor_41f4a519b878ee3b = []byte{
-	// 1275 bytes of a gzipped FileDescriptorProto
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 }