diff --git a/internal/indexcoord/meta_table.go b/internal/indexcoord/meta_table.go
index f6fb79ae764a0dacd87eca09c2ff6a93de6420d7..f47e88cb6db7c2793ace5a740aeee9e2325a6357 100644
--- a/internal/indexcoord/meta_table.go
+++ b/internal/indexcoord/meta_table.go
@@ -316,6 +316,7 @@ func (mt *metaTable) GetIndexFilePathInfo(indexBuildID UniqueID) (*indexpb.Index
 		return nil, fmt.Errorf("index not exists with ID = %d", indexBuildID)
 	}
 	ret.IndexFilePaths = meta.indexMeta.IndexFilePaths
+	ret.SerializedSize = meta.indexMeta.GetSerializeSize()
 	return ret, nil
 }
 
diff --git a/internal/proto/index_coord.proto b/internal/proto/index_coord.proto
index 3496901c04e93ca17809ca410b8761e845d05593..b5e3cef567d8576b7b22cadfdef9d1802687055f 100644
--- a/internal/proto/index_coord.proto
+++ b/internal/proto/index_coord.proto
@@ -95,6 +95,7 @@ message IndexFilePathInfo {
   common.Status status = 1;
   int64 indexBuildID = 2;
   repeated string index_file_paths = 3;
+  uint64 serialized_size = 4;
 }
 
 message GetIndexFilePathsResponse {
diff --git a/internal/proto/indexpb/index_coord.pb.go b/internal/proto/indexpb/index_coord.pb.go
index 0257a4a2394c780aefdff97fd48c63a268c82b3c..c0d9cf1d83fb56f408ac16d1037ae6b4de275a8a 100644
--- a/internal/proto/indexpb/index_coord.pb.go
+++ b/internal/proto/indexpb/index_coord.pb.go
@@ -567,6 +567,7 @@ type IndexFilePathInfo struct {
 	Status               *commonpb.Status `protobuf:"bytes,1,opt,name=status,proto3" json:"status,omitempty"`
 	IndexBuildID         int64            `protobuf:"varint,2,opt,name=indexBuildID,proto3" json:"indexBuildID,omitempty"`
 	IndexFilePaths       []string         `protobuf:"bytes,3,rep,name=index_file_paths,json=indexFilePaths,proto3" json:"index_file_paths,omitempty"`
+	SerializedSize       uint64           `protobuf:"varint,4,opt,name=serialized_size,json=serializedSize,proto3" json:"serialized_size,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}         `json:"-"`
 	XXX_unrecognized     []byte           `json:"-"`
 	XXX_sizecache        int32            `json:"-"`
@@ -618,6 +619,13 @@ func (m *IndexFilePathInfo) GetIndexFilePaths() []string {
 	return nil
 }
 
+func (m *IndexFilePathInfo) GetSerializedSize() uint64 {
+	if m != nil {
+		return m.SerializedSize
+	}
+	return 0
+}
+
 type GetIndexFilePathsResponse struct {
 	Status               *commonpb.Status     `protobuf:"bytes,1,opt,name=status,proto3" json:"status,omitempty"`
 	FilePaths            []*IndexFilePathInfo `protobuf:"bytes,2,rep,name=file_paths,json=filePaths,proto3" json:"file_paths,omitempty"`
@@ -834,73 +842,74 @@ func init() {
 func init() { proto.RegisterFile("index_coord.proto", fileDescriptor_f9e019eb3fda53c2) }
 
 var fileDescriptor_f9e019eb3fda53c2 = []byte{
-	// 1057 bytes of a gzipped FileDescriptorProto
+	// 1073 bytes of a gzipped FileDescriptorProto
 	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xec, 0x56, 0xcd, 0x6e, 0xdb, 0x46,
-	0x10, 0x36, 0x4d, 0x5b, 0x3f, 0x23, 0xc5, 0x88, 0xb7, 0x69, 0xc0, 0x28, 0x0d, 0x22, 0xb3, 0x49,
-	0xaa, 0x16, 0x89, 0x1c, 0x28, 0x4d, 0x7b, 0x2a, 0xd0, 0xda, 0x42, 0x0c, 0xa3, 0x70, 0x60, 0xac,
-	0x8d, 0x1e, 0x0a, 0x14, 0xc2, 0x5a, 0x1c, 0xd9, 0x8b, 0xf0, 0x47, 0xe6, 0xae, 0x92, 0xda, 0xc7,
-	0xa2, 0xf7, 0xde, 0xd2, 0x47, 0xe9, 0x73, 0xe4, 0x71, 0x7a, 0x2b, 0x76, 0xb9, 0xa4, 0x49, 0x89,
-	0x72, 0xe4, 0xba, 0x69, 0x2f, 0xbd, 0x71, 0x86, 0xdf, 0xec, 0xec, 0x7c, 0x3b, 0xf3, 0xed, 0xc2,
-	0x3a, 0x0f, 0x3d, 0xfc, 0x79, 0x30, 0x8c, 0xa2, 0xd8, 0xeb, 0x8e, 0xe3, 0x48, 0x46, 0x84, 0x04,
-	0xdc, 0x7f, 0x3d, 0x11, 0x89, 0xd5, 0xd5, 0xff, 0x5b, 0xcd, 0x61, 0x14, 0x04, 0x51, 0x98, 0xf8,
-	0x5a, 0x6b, 0x3c, 0x94, 0x18, 0x87, 0xcc, 0x37, 0x76, 0x33, 0x1f, 0xd1, 0x6a, 0x8a, 0xe1, 0x09,
-	0x06, 0x2c, 0xb1, 0xdc, 0xdf, 0x2d, 0xf8, 0x88, 0xe2, 0x31, 0x17, 0x12, 0xe3, 0x97, 0x91, 0x87,
-	0x14, 0x4f, 0x27, 0x28, 0x24, 0x79, 0x0a, 0x2b, 0x47, 0x4c, 0xa0, 0x63, 0xb5, 0xad, 0x4e, 0xa3,
-	0xf7, 0x49, 0xb7, 0x90, 0xd4, 0x64, 0xdb, 0x13, 0xc7, 0x5b, 0x4c, 0x20, 0xd5, 0x48, 0xf2, 0x15,
-	0x54, 0x99, 0xe7, 0xc5, 0x28, 0x84, 0xb3, 0x7c, 0x49, 0xd0, 0x77, 0x09, 0x86, 0xa6, 0x60, 0x72,
-	0x1b, 0x2a, 0x61, 0xe4, 0xe1, 0x6e, 0xdf, 0xb1, 0xdb, 0x56, 0xc7, 0xa6, 0xc6, 0x72, 0x7f, 0xb3,
-	0xe0, 0x56, 0x71, 0x67, 0x62, 0x1c, 0x85, 0x02, 0xc9, 0x33, 0xa8, 0x08, 0xc9, 0xe4, 0x44, 0x98,
-	0xcd, 0xdd, 0x2d, 0xcd, 0x73, 0xa0, 0x21, 0xd4, 0x40, 0xc9, 0x16, 0x34, 0x78, 0xc8, 0xe5, 0x60,
-	0xcc, 0x62, 0x16, 0xa4, 0x3b, 0xdc, 0xe8, 0x4e, 0x71, 0x69, 0x68, 0xdb, 0x0d, 0xb9, 0xdc, 0xd7,
-	0x40, 0x0a, 0x3c, 0xfb, 0x76, 0xbf, 0x81, 0x8f, 0x77, 0x50, 0xee, 0x2a, 0xc6, 0xd5, 0xea, 0x28,
-	0x52, 0xb2, 0x1e, 0xc0, 0x0d, 0x7d, 0x0e, 0x5b, 0x13, 0xee, 0x7b, 0xbb, 0x7d, 0xb5, 0x31, 0xbb,
-	0x63, 0xd3, 0xa2, 0xd3, 0xfd, 0xc3, 0x82, 0xba, 0x0e, 0xde, 0x0d, 0x47, 0x11, 0x79, 0x0e, 0xab,
-	0x6a, 0x6b, 0x09, 0xc3, 0x6b, 0xbd, 0xfb, 0xa5, 0x45, 0x5c, 0xe4, 0xa2, 0x09, 0x9a, 0xb8, 0xd0,
-	0xcc, 0xaf, 0xaa, 0x0b, 0xb1, 0x69, 0xc1, 0x47, 0x1c, 0xa8, 0x6a, 0x3b, 0xa3, 0x34, 0x35, 0xc9,
-	0x3d, 0x80, 0xa4, 0xa1, 0x42, 0x16, 0xa0, 0xb3, 0xd2, 0xb6, 0x3a, 0x75, 0x5a, 0xd7, 0x9e, 0x97,
-	0x2c, 0x40, 0x75, 0x14, 0x31, 0x32, 0x11, 0x85, 0xce, 0xaa, 0xfe, 0x65, 0x2c, 0xf7, 0x57, 0x0b,
-	0x6e, 0x4f, 0x57, 0x7e, 0x9d, 0xc3, 0x78, 0x9e, 0x04, 0xa1, 0x3a, 0x07, 0xbb, 0xd3, 0xe8, 0xdd,
-	0xeb, 0xce, 0xf6, 0x74, 0x37, 0xa3, 0x8a, 0x1a, 0xb0, 0xfb, 0x6e, 0x19, 0xc8, 0x76, 0x8c, 0x4c,
-	0xa2, 0xfe, 0x97, 0xb2, 0x3f, 0x4d, 0x89, 0x55, 0x42, 0x49, 0xb1, 0xf0, 0xe5, 0xe9, 0xc2, 0xe7,
-	0x33, 0xe6, 0x40, 0xf5, 0x35, 0xc6, 0x82, 0x47, 0xa1, 0xa6, 0xcb, 0xa6, 0xa9, 0x49, 0xee, 0x42,
-	0x3d, 0x40, 0xc9, 0x06, 0x63, 0x26, 0x4f, 0x0c, 0x5f, 0x35, 0xe5, 0xd8, 0x67, 0xf2, 0x44, 0xe5,
-	0xf3, 0x98, 0xf9, 0x29, 0x9c, 0x4a, 0xdb, 0x56, 0xf9, 0x94, 0x47, 0xfd, 0xd5, 0xdd, 0x28, 0xcf,
-	0xc6, 0x98, 0x76, 0x63, 0x55, 0xb3, 0xb0, 0x51, 0x4a, 0xdd, 0xf7, 0x78, 0xf6, 0x03, 0xf3, 0x27,
-	0xb8, 0xcf, 0x78, 0x4c, 0x41, 0x45, 0x25, 0xdd, 0x48, 0xfa, 0xa6, 0xec, 0x74, 0x91, 0xda, 0xa2,
-	0x8b, 0x34, 0x74, 0x98, 0xe9, 0xe9, 0x3f, 0x97, 0x61, 0x3d, 0x21, 0xe9, 0x5f, 0xa3, 0xb4, 0xc8,
-	0xcd, 0xea, 0x7b, 0xb8, 0xa9, 0xfc, 0x13, 0xdc, 0x54, 0xff, 0x0e, 0x37, 0xe4, 0x0e, 0xd4, 0xc2,
-	0x49, 0x30, 0x88, 0xa3, 0x37, 0x8a, 0x5d, 0x5d, 0x43, 0x38, 0x09, 0x68, 0xf4, 0x46, 0x90, 0x6d,
-	0x68, 0x8e, 0x38, 0xfa, 0xde, 0x20, 0x11, 0x53, 0xa7, 0xae, 0x9b, 0xbf, 0x5d, 0x4c, 0x60, 0x84,
-	0xf6, 0x85, 0x02, 0x1e, 0xe8, 0x6f, 0xda, 0x18, 0x5d, 0x18, 0x6e, 0x00, 0x24, 0x4f, 0xfd, 0x75,
-	0x26, 0x6a, 0x01, 0x59, 0x70, 0xbf, 0x05, 0x27, 0x1d, 0xe2, 0x17, 0xdc, 0x47, 0xcd, 0xf6, 0xd5,
-	0x14, 0xec, 0xad, 0x05, 0xeb, 0x85, 0x78, 0xad, 0x64, 0x1f, 0x6a, 0xc3, 0xa4, 0x03, 0x37, 0x93,
-	0x53, 0x1c, 0x71, 0x1f, 0x4d, 0xbb, 0xd8, 0xba, 0x5d, 0xd6, 0x78, 0xa1, 0x0a, 0xb5, 0xb1, 0x3b,
-	0x25, 0xb5, 0x5d, 0x87, 0xd1, 0x3e, 0x40, 0x2e, 0x6d, 0xa2, 0x53, 0x0f, 0xe7, 0xea, 0x54, 0x9e,
-	0x10, 0x5a, 0x1f, 0x65, 0x1b, 0xfb, 0xc5, 0x36, 0x9a, 0xbf, 0x87, 0x92, 0x2d, 0x34, 0x56, 0xd9,
-	0xbd, 0xb0, 0x7c, 0xa5, 0x7b, 0xe1, 0x3e, 0x34, 0x46, 0x8c, 0xfb, 0x03, 0xa3, 0xdf, 0xb6, 0x1e,
-	0x47, 0x50, 0x2e, 0xaa, 0x3d, 0xe4, 0x6b, 0xb0, 0x63, 0x3c, 0xd5, 0x22, 0x36, 0xa7, 0x90, 0x19,
-	0x19, 0xa0, 0x2a, 0xa2, 0xf4, 0x14, 0x56, 0xcb, 0x4e, 0x81, 0x6c, 0x40, 0x33, 0x60, 0xf1, 0xab,
-	0x81, 0x87, 0x3e, 0x4a, 0xf4, 0x9c, 0x4a, 0xdb, 0xea, 0xd4, 0x68, 0x43, 0xf9, 0xfa, 0x89, 0x2b,
-	0x77, 0xd9, 0x57, 0xf3, 0x97, 0x7d, 0x5e, 0x66, 0x6b, 0x45, 0x99, 0x6d, 0x41, 0x2d, 0xc6, 0xe1,
-	0xd9, 0xd0, 0x47, 0x4f, 0x4f, 0x59, 0x8d, 0x66, 0x36, 0x79, 0x08, 0x6b, 0x02, 0x63, 0xce, 0x7c,
-	0x7e, 0x8e, 0x03, 0xc1, 0xcf, 0xd1, 0x81, 0xb6, 0xd5, 0x59, 0xa1, 0x37, 0x32, 0xef, 0x01, 0x3f,
-	0x47, 0xf7, 0x31, 0xdc, 0xec, 0xc7, 0xd1, 0xb8, 0xa0, 0x70, 0x39, 0x79, 0xb2, 0x0a, 0xf2, 0xd4,
-	0x7b, 0x57, 0x01, 0xd0, 0xd0, 0x6d, 0xf5, 0xe8, 0x22, 0x63, 0x20, 0x3b, 0x28, 0xb7, 0xa3, 0x60,
-	0x1c, 0x85, 0x18, 0xca, 0xe4, 0xfa, 0x23, 0x4f, 0xe7, 0xbc, 0x1c, 0x66, 0xa1, 0x26, 0x61, 0xeb,
-	0xd1, 0x9c, 0x88, 0x29, 0xb8, 0xbb, 0x44, 0x02, 0x9d, 0xf1, 0x90, 0x07, 0x78, 0xc8, 0x87, 0xaf,
-	0xb6, 0x4f, 0x58, 0x18, 0xa2, 0x7f, 0x59, 0xc6, 0x29, 0x68, 0x9a, 0xf1, 0xd3, 0x62, 0x84, 0x31,
-	0x0e, 0x64, 0xcc, 0xc3, 0xe3, 0x74, 0x36, 0xdc, 0x25, 0x72, 0x0a, 0xb7, 0x76, 0x50, 0x67, 0xe7,
-	0x42, 0xf2, 0xa1, 0x48, 0x13, 0xf6, 0xe6, 0x27, 0x9c, 0x01, 0x5f, 0x31, 0xe5, 0x4f, 0x00, 0x17,
-	0xcd, 0x46, 0x16, 0x6b, 0xc6, 0x59, 0x02, 0xa7, 0x61, 0xd9, 0xf2, 0x1c, 0xd6, 0x8a, 0xaf, 0x15,
-	0xf2, 0x79, 0x59, 0x6c, 0xe9, 0x5b, 0xae, 0xf5, 0xc5, 0x22, 0xd0, 0x2c, 0x55, 0x0c, 0xeb, 0x33,
-	0xba, 0x43, 0x1e, 0x5f, 0xb6, 0xc4, 0xb4, 0xf4, 0xb6, 0x9e, 0x2c, 0x88, 0xce, 0x72, 0xee, 0x43,
-	0x3d, 0x6b, 0x67, 0xf2, 0xa0, 0x2c, 0x7a, 0xba, 0xdb, 0x5b, 0x97, 0x29, 0x9e, 0xbb, 0x44, 0x06,
-	0x00, 0x3b, 0x28, 0xf7, 0x50, 0xc6, 0x7c, 0x28, 0xc8, 0xa3, 0xd2, 0x43, 0xbc, 0x00, 0xa4, 0x8b,
-	0x7e, 0xf6, 0x5e, 0x5c, 0xba, 0xe5, 0xde, 0xdb, 0x15, 0x23, 0x83, 0xea, 0x21, 0xff, 0xff, 0x48,
-	0x7d, 0x80, 0x91, 0x3a, 0x84, 0x46, 0xee, 0x69, 0x4c, 0x4a, 0x87, 0x65, 0xf6, 0xed, 0xfc, 0x5f,
-	0x37, 0xc6, 0xd6, 0x97, 0x3f, 0xf6, 0x8e, 0xb9, 0x3c, 0x99, 0x1c, 0xa9, 0xd4, 0x9b, 0x09, 0xf2,
-	0x09, 0x8f, 0xcc, 0xd7, 0x66, 0xca, 0xd0, 0xa6, 0x5e, 0x69, 0x53, 0x97, 0x31, 0x3e, 0x3a, 0xaa,
-	0x68, 0xf3, 0xd9, 0x5f, 0x01, 0x00, 0x00, 0xff, 0xff, 0x1b, 0x2b, 0xc8, 0x1a, 0x1e, 0x0f, 0x00,
+	0x10, 0x36, 0x4d, 0x5b, 0x3f, 0x23, 0xc5, 0x8d, 0xb7, 0x69, 0xc0, 0x28, 0x0d, 0x22, 0xb3, 0xf9,
+	0x51, 0x8b, 0x44, 0x0e, 0x94, 0xa6, 0x3d, 0x15, 0x68, 0x6d, 0x21, 0x86, 0x51, 0x38, 0x30, 0xd6,
+	0x46, 0x0f, 0x05, 0x0a, 0x61, 0x2d, 0x8e, 0xec, 0x45, 0xf8, 0x23, 0x73, 0x57, 0x49, 0xed, 0x63,
+	0xd1, 0x7b, 0x6f, 0xe9, 0xa3, 0xf4, 0xd8, 0x67, 0xc8, 0xe3, 0xf4, 0x56, 0xec, 0x72, 0x29, 0x91,
+	0x12, 0xe5, 0xc8, 0x75, 0xd3, 0x5e, 0x72, 0xe3, 0xcc, 0x7e, 0xb3, 0xb3, 0xf3, 0xed, 0xec, 0xc7,
+	0x81, 0x75, 0x1e, 0x7a, 0xf8, 0x73, 0xaf, 0x1f, 0x45, 0xb1, 0xd7, 0x1e, 0xc6, 0x91, 0x8c, 0x08,
+	0x09, 0xb8, 0xff, 0x6a, 0x24, 0x12, 0xab, 0xad, 0xd7, 0x1b, 0xf5, 0x7e, 0x14, 0x04, 0x51, 0x98,
+	0xf8, 0x1a, 0x6b, 0x3c, 0x94, 0x18, 0x87, 0xcc, 0x37, 0x76, 0x3d, 0x1b, 0xd1, 0xa8, 0x8b, 0xfe,
+	0x09, 0x06, 0x2c, 0xb1, 0xdc, 0xdf, 0x2d, 0xf8, 0x98, 0xe2, 0x31, 0x17, 0x12, 0xe3, 0x17, 0x91,
+	0x87, 0x14, 0x4f, 0x47, 0x28, 0x24, 0x79, 0x02, 0x2b, 0x47, 0x4c, 0xa0, 0x63, 0x35, 0xad, 0x56,
+	0xad, 0xf3, 0x69, 0x3b, 0x97, 0xd4, 0x64, 0xdb, 0x13, 0xc7, 0x5b, 0x4c, 0x20, 0xd5, 0x48, 0xf2,
+	0x15, 0x94, 0x99, 0xe7, 0xc5, 0x28, 0x84, 0xb3, 0x7c, 0x41, 0xd0, 0x77, 0x09, 0x86, 0xa6, 0x60,
+	0x72, 0x13, 0x4a, 0x61, 0xe4, 0xe1, 0x6e, 0xd7, 0xb1, 0x9b, 0x56, 0xcb, 0xa6, 0xc6, 0x72, 0x7f,
+	0xb3, 0xe0, 0x46, 0xfe, 0x64, 0x62, 0x18, 0x85, 0x02, 0xc9, 0x53, 0x28, 0x09, 0xc9, 0xe4, 0x48,
+	0x98, 0xc3, 0xdd, 0x2e, 0xcc, 0x73, 0xa0, 0x21, 0xd4, 0x40, 0xc9, 0x16, 0xd4, 0x78, 0xc8, 0x65,
+	0x6f, 0xc8, 0x62, 0x16, 0xa4, 0x27, 0xdc, 0x68, 0x4f, 0x71, 0x69, 0x68, 0xdb, 0x0d, 0xb9, 0xdc,
+	0xd7, 0x40, 0x0a, 0x7c, 0xfc, 0xed, 0x7e, 0x03, 0x9f, 0xec, 0xa0, 0xdc, 0x55, 0x8c, 0xab, 0xdd,
+	0x51, 0xa4, 0x64, 0xdd, 0x83, 0x6b, 0xfa, 0x1e, 0xb6, 0x46, 0xdc, 0xf7, 0x76, 0xbb, 0xea, 0x60,
+	0x76, 0xcb, 0xa6, 0x79, 0xa7, 0xfb, 0x87, 0x05, 0x55, 0x1d, 0xbc, 0x1b, 0x0e, 0x22, 0xf2, 0x0c,
+	0x56, 0xd5, 0xd1, 0x12, 0x86, 0xd7, 0x3a, 0x77, 0x0b, 0x8b, 0x98, 0xe4, 0xa2, 0x09, 0x9a, 0xb8,
+	0x50, 0xcf, 0xee, 0xaa, 0x0b, 0xb1, 0x69, 0xce, 0x47, 0x1c, 0x28, 0x6b, 0x7b, 0x4c, 0x69, 0x6a,
+	0x92, 0x3b, 0x00, 0x49, 0x43, 0x85, 0x2c, 0x40, 0x67, 0xa5, 0x69, 0xb5, 0xaa, 0xb4, 0xaa, 0x3d,
+	0x2f, 0x58, 0x80, 0xea, 0x2a, 0x62, 0x64, 0x22, 0x0a, 0x9d, 0x55, 0xbd, 0x64, 0x2c, 0xf7, 0x57,
+	0x0b, 0x6e, 0x4e, 0x57, 0x7e, 0x95, 0xcb, 0x78, 0x96, 0x04, 0xa1, 0xba, 0x07, 0xbb, 0x55, 0xeb,
+	0xdc, 0x69, 0xcf, 0xf6, 0x74, 0x7b, 0x4c, 0x15, 0x35, 0x60, 0xf7, 0xed, 0x32, 0x90, 0xed, 0x18,
+	0x99, 0x44, 0xbd, 0x96, 0xb2, 0x3f, 0x4d, 0x89, 0x55, 0x40, 0x49, 0xbe, 0xf0, 0xe5, 0xe9, 0xc2,
+	0xe7, 0x33, 0xe6, 0x40, 0xf9, 0x15, 0xc6, 0x82, 0x47, 0xa1, 0xa6, 0xcb, 0xa6, 0xa9, 0x49, 0x6e,
+	0x43, 0x35, 0x40, 0xc9, 0x7a, 0x43, 0x26, 0x4f, 0x0c, 0x5f, 0x15, 0xe5, 0xd8, 0x67, 0xf2, 0x44,
+	0xe5, 0xf3, 0x98, 0x59, 0x14, 0x4e, 0xa9, 0x69, 0xab, 0x7c, 0xca, 0xa3, 0x56, 0x75, 0x37, 0xca,
+	0xb3, 0x21, 0xa6, 0xdd, 0x58, 0xd6, 0x2c, 0x6c, 0x14, 0x52, 0xf7, 0x3d, 0x9e, 0xfd, 0xc0, 0xfc,
+	0x11, 0xee, 0x33, 0x1e, 0x53, 0x50, 0x51, 0x49, 0x37, 0x92, 0xae, 0x29, 0x3b, 0xdd, 0xa4, 0xb2,
+	0xe8, 0x26, 0x35, 0x1d, 0x66, 0x7a, 0xfa, 0xaf, 0x65, 0x58, 0x4f, 0x48, 0xfa, 0xcf, 0x28, 0xcd,
+	0x73, 0xb3, 0xfa, 0x0e, 0x6e, 0x4a, 0xff, 0x06, 0x37, 0xe5, 0x7f, 0xc2, 0x0d, 0xb9, 0x05, 0x95,
+	0x70, 0x14, 0xf4, 0xe2, 0xe8, 0xb5, 0x62, 0x57, 0xd7, 0x10, 0x8e, 0x02, 0x1a, 0xbd, 0x16, 0x64,
+	0x1b, 0xea, 0x03, 0x8e, 0xbe, 0xd7, 0x4b, 0xc4, 0xd4, 0xa9, 0xea, 0xe6, 0x6f, 0xe6, 0x13, 0x18,
+	0xa1, 0x7d, 0xae, 0x80, 0x07, 0xfa, 0x9b, 0xd6, 0x06, 0x13, 0xc3, 0x0d, 0x80, 0x64, 0xa9, 0xbf,
+	0xca, 0x8b, 0x5a, 0x40, 0x16, 0xdc, 0x6f, 0xc1, 0x49, 0x1f, 0xf1, 0x73, 0xee, 0xa3, 0x66, 0xfb,
+	0x72, 0x0a, 0xf6, 0xa7, 0x05, 0xeb, 0xb9, 0x78, 0xad, 0x64, 0xef, 0xeb, 0xc0, 0xa4, 0x05, 0xd7,
+	0x93, 0x5b, 0x1c, 0x70, 0x1f, 0x4d, 0xbb, 0xd8, 0xba, 0x5d, 0xd6, 0x78, 0xae, 0x0a, 0xf2, 0x10,
+	0x3e, 0x12, 0x18, 0x73, 0xe6, 0xf3, 0x73, 0xf4, 0x7a, 0x82, 0x9f, 0x27, 0xe2, 0xb6, 0x42, 0xd7,
+	0x26, 0xee, 0x03, 0x7e, 0x8e, 0xee, 0x1b, 0x0b, 0x6e, 0x15, 0x90, 0x70, 0x15, 0xea, 0xbb, 0x00,
+	0x99, 0xf3, 0x25, 0x82, 0x76, 0x7f, 0xae, 0xa0, 0x65, 0x99, 0xa3, 0xd5, 0x41, 0x7a, 0x04, 0xf7,
+	0x17, 0xdb, 0xfc, 0x1c, 0xf6, 0x50, 0xb2, 0x85, 0xde, 0xdf, 0xf8, 0x07, 0xb2, 0x7c, 0xa9, 0x1f,
+	0xc8, 0x5d, 0xa8, 0x0d, 0x18, 0xf7, 0x7b, 0x46, 0xe8, 0x6d, 0xfd, 0x6e, 0x41, 0xb9, 0xa8, 0xf6,
+	0x90, 0xaf, 0xc1, 0x8e, 0xf1, 0x54, 0xf3, 0x37, 0xa7, 0x90, 0x19, 0xbd, 0xa0, 0x2a, 0xa2, 0xf0,
+	0xba, 0x56, 0x0b, 0xaf, 0x6b, 0x03, 0xea, 0x01, 0x8b, 0x5f, 0xf6, 0x3c, 0xf4, 0x51, 0xa2, 0xe7,
+	0x94, 0x9a, 0x56, 0xab, 0x42, 0x6b, 0xca, 0xd7, 0x4d, 0x5c, 0x99, 0xa9, 0xa0, 0x9c, 0x9d, 0x0a,
+	0xb2, 0x7a, 0x5c, 0xc9, 0xeb, 0x71, 0x03, 0x2a, 0x31, 0xf6, 0xcf, 0xfa, 0x3e, 0x7a, 0xfa, 0x39,
+	0x56, 0xe8, 0xd8, 0x26, 0xf7, 0x61, 0xd2, 0x08, 0x49, 0x7b, 0x80, 0x6e, 0x8f, 0x6b, 0x63, 0xaf,
+	0xee, 0x8e, 0x47, 0x70, 0xbd, 0x1b, 0x47, 0xc3, 0x9c, 0x14, 0x66, 0x74, 0xcc, 0xca, 0xe9, 0x58,
+	0xe7, 0x6d, 0x09, 0x40, 0x43, 0xb7, 0xd5, 0x74, 0x46, 0x86, 0x40, 0x76, 0x50, 0x6e, 0x47, 0xc1,
+	0x30, 0x0a, 0x31, 0x94, 0xc9, 0x7f, 0x92, 0x3c, 0x99, 0x33, 0x62, 0xcc, 0x42, 0x4d, 0xc2, 0xc6,
+	0x83, 0x39, 0x11, 0x53, 0x70, 0x77, 0x89, 0x04, 0x3a, 0xe3, 0x21, 0x0f, 0xf0, 0x90, 0xf7, 0x5f,
+	0x6e, 0x9f, 0xb0, 0x30, 0x44, 0xff, 0xa2, 0x8c, 0x53, 0xd0, 0x34, 0xe3, 0x67, 0xf9, 0x08, 0x63,
+	0x1c, 0xc8, 0x98, 0x87, 0xc7, 0xe9, 0xdb, 0x70, 0x97, 0xc8, 0x29, 0xdc, 0xd8, 0x41, 0x9d, 0x9d,
+	0x0b, 0xc9, 0xfb, 0x22, 0x4d, 0xd8, 0x99, 0x9f, 0x70, 0x06, 0x7c, 0xc9, 0x94, 0x3f, 0x01, 0x4c,
+	0x9a, 0x8d, 0x2c, 0xd6, 0x8c, 0xb3, 0x04, 0x4e, 0xc3, 0xc6, 0xdb, 0x73, 0x58, 0xcb, 0x8f, 0x35,
+	0xe4, 0xf3, 0xa2, 0xd8, 0xc2, 0xa1, 0xaf, 0xf1, 0xc5, 0x22, 0xd0, 0x71, 0xaa, 0x18, 0xd6, 0x67,
+	0x74, 0x87, 0x3c, 0xba, 0x68, 0x8b, 0x69, 0x8d, 0x6e, 0x3c, 0x5e, 0x10, 0x3d, 0xce, 0xb9, 0x0f,
+	0xd5, 0x71, 0x3b, 0x93, 0x7b, 0x45, 0xd1, 0xd3, 0xdd, 0xde, 0xb8, 0x48, 0xf1, 0xdc, 0x25, 0xd2,
+	0x03, 0xd8, 0x41, 0xb9, 0x87, 0x32, 0xe6, 0x7d, 0x41, 0x1e, 0x14, 0x5e, 0xe2, 0x04, 0x90, 0x6e,
+	0xfa, 0xf0, 0x9d, 0xb8, 0xf4, 0xc8, 0x9d, 0x37, 0x2b, 0x46, 0x06, 0xd5, 0xc4, 0xff, 0xe1, 0x49,
+	0xbd, 0x87, 0x27, 0x75, 0x08, 0xb5, 0xcc, 0x0c, 0x4d, 0x0a, 0x1f, 0xcb, 0xec, 0x90, 0xfd, 0x7f,
+	0x37, 0xc6, 0xd6, 0x97, 0x3f, 0x76, 0x8e, 0xb9, 0x3c, 0x19, 0x1d, 0xa9, 0xd4, 0x9b, 0x09, 0xf2,
+	0x31, 0x8f, 0xcc, 0xd7, 0x66, 0xca, 0xd0, 0xa6, 0xde, 0x69, 0x53, 0x97, 0x31, 0x3c, 0x3a, 0x2a,
+	0x69, 0xf3, 0xe9, 0xdf, 0x01, 0x00, 0x00, 0xff, 0xff, 0xd8, 0x29, 0x0d, 0x3e, 0x47, 0x0f, 0x00,
 	0x00,
 }
 
diff --git a/internal/querycoord/cluster.go b/internal/querycoord/cluster.go
index 8b5ee373a016420ef20fb9651eb29853bb839641..d0ca8b7f6a6bc1582241ed74e1faac0955e418a8 100644
--- a/internal/querycoord/cluster.go
+++ b/internal/querycoord/cluster.go
@@ -35,7 +35,6 @@ import (
 	"github.com/milvus-io/milvus/internal/proto/internalpb"
 	"github.com/milvus-io/milvus/internal/proto/milvuspb"
 	"github.com/milvus-io/milvus/internal/proto/querypb"
-	"github.com/milvus-io/milvus/internal/storage"
 	"github.com/milvus-io/milvus/internal/util/sessionutil"
 	"github.com/milvus-io/milvus/internal/util/typeutil"
 )
@@ -721,20 +720,7 @@ func estimateSegmentsSize(segments *querypb.LoadSegmentsRequest, kvClient kv.Dat
 		// get index size
 		if loadInfo.EnableIndex {
 			for _, pathInfo := range loadInfo.IndexPathInfos {
-				for _, path := range pathInfo.IndexFilePaths {
-					indexSize, err := storage.EstimateMemorySize(kvClient, path)
-					if err != nil {
-						indexSize, err = storage.GetBinlogSize(kvClient, path)
-						if err != nil {
-							log.Warn("estimate index size wrong",
-								zap.Int64("segmentID", loadInfo.GetSegmentID()),
-								zap.String("path", path),
-								zap.Error(err))
-							return 0, err
-						}
-					}
-					segmentSize += indexSize
-				}
+				segmentSize += int64(pathInfo.GetSerializedSize())
 			}
 			continue
 		}
diff --git a/internal/querycoord/cluster_test.go b/internal/querycoord/cluster_test.go
index 9ea1d833dd0ee8e484e026dbc7750fdd58b051c1..77bf014e1dea63f710ed9b082b0988c87c501d63 100644
--- a/internal/querycoord/cluster_test.go
+++ b/internal/querycoord/cluster_test.go
@@ -700,17 +700,19 @@ func TestEstimateSegmentSize(t *testing.T) {
 
 	indexInfo := &indexpb.IndexFilePathInfo{
 		IndexFilePaths: indexPath,
+		SerializedSize: 1024,
 	}
 	loadInfo.IndexPathInfos = []*indexpb.IndexFilePathInfo{indexInfo}
 	loadInfo.EnableIndex = true
 
 	size, err = estimateSegmentsSize(loadReq, dataKV)
 	assert.NoError(t, err)
-	assert.NotEqual(t, int64(0), size)
+	assert.Equal(t, int64(1024), size)
 
 	indexInfo.IndexFilePaths = []string{"&*^*(^*(&*%^&*^(&"}
+	indexInfo.SerializedSize = 0
 	size, err = estimateSegmentsSize(loadReq, dataKV)
-	assert.Error(t, err)
+	assert.NoError(t, err)
 	assert.Equal(t, int64(0), size)
 
 	cancel()