diff --git a/core/backup_context.go b/core/backup_context.go
index d382256..7866270 100644
--- a/core/backup_context.go
+++ b/core/backup_context.go
@@ -26,6 +26,8 @@ const (
 	COLLECTION_RENAME_SUFFIX      = "COLLECTION_RENAME_SUFFIX"
 	RPS                           = 1000
 	BackupSegmentGroupMaxSizeInMB = 256
+
+	GC_Warn_Message = "This warn won't fail the backup process. Pause GC can protect data not to be GCed during backup, it is necessary to backup very large data(cost more than a hour)."
 )
 
 // makes sure BackupContext implements `Backup`
@@ -270,15 +272,15 @@ func (b *BackupContext) GetBackup(ctx context.Context, request *backuppb.GetBack
 			zap.String("backupName", request.GetBackupName()),
 			zap.String("backupId", request.GetBackupId()),
 			zap.String("bucketName", request.GetBucketName()),
-			zap.String("path", request.GetPath()),
-			zap.Any("resp", resp))
+			zap.String("path", request.GetPath()))
 	} else {
 		log.Info("finish GetBackupRequest",
 			zap.String("requestId", request.GetRequestId()),
 			zap.String("backupName", request.GetBackupName()),
 			zap.String("backupId", request.GetBackupId()),
 			zap.String("bucketName", request.GetBucketName()),
-			zap.String("path", request.GetPath()))
+			zap.String("path", request.GetPath()),
+			zap.Any("resp", resp))
 	}
 
 	return resp
diff --git a/core/backup_impl_create_backup.go b/core/backup_impl_create_backup.go
index 34fb247..244e467 100644
--- a/core/backup_impl_create_backup.go
+++ b/core/backup_impl_create_backup.go
@@ -395,38 +395,45 @@ func (b *BackupContext) backupCollectionPrepare(ctx context.Context, backupInfo
 			return err
 		}
 
-		segmentIDsEntitiesBeforeFlush := lo.Map(segmentEntitiesBeforeFlush, func(segment *entity.Segment, _ int) int64 { return segment.ID })
-		segmentIDsEntitiesAfterFlush := lo.Map(segmentEntitiesAfterFlush, func(segment *entity.Segment, _ int) int64 { return segment.ID })
+		segmentIDsBeforeFlush := lo.Map(segmentEntitiesBeforeFlush, func(segment *entity.Segment, _ int) int64 { return segment.ID })
+		segmentIDsAfterFlush := lo.Map(segmentEntitiesAfterFlush, func(segment *entity.Segment, _ int) int64 { return segment.ID })
+		newL0Segments := lo.Filter(segmentEntitiesAfterFlush, func(segment *entity.Segment, _ int) bool {
+			return !lo.Contains(segmentIDsBeforeFlush, segment.ID) && segment.NumRows == 0
+		})
+		newL0SegmentsIDs := lo.Map(newL0Segments, func(segment *entity.Segment, _ int) int64 { return segment.ID })
+
 		log.Info("GetPersistentSegmentInfo after flush from milvus",
 			zap.String("databaseName", collectionBackup.GetDbName()),
 			zap.String("collectionName", collectionBackup.GetCollectionName()),
-			zap.Int("segmentNumBeforeFlush", len(segmentEntitiesBeforeFlush)),
-			zap.Int("segmentNumAfterFlush", len(segmentEntitiesAfterFlush)),
-			zap.Int64s("segmentsBeforeFlush", segmentIDsEntitiesBeforeFlush),
-			zap.Int64s("segmentsAfterFlush", segmentIDsEntitiesAfterFlush))
-		segmentDict := utils.ArrayToMap(flushSegmentIDs)
+			zap.Int64s("segmentIDsBeforeFlush", segmentIDsBeforeFlush),
+			zap.Int64s("segmentIDsAfterFlush", segmentIDsAfterFlush),
+			zap.Int64s("newL0SegmentsIDs", newL0SegmentsIDs))
+
+		segmentEntities := segmentEntitiesBeforeFlush
 		for _, seg := range segmentEntitiesAfterFlush {
-			sid := seg.ID
-			if _, ok := segmentDict[sid]; ok {
-				delete(segmentDict, sid)
-				unfilledSegments = append(unfilledSegments, seg)
-			} else {
-				log.Info("this may be new segments after flush, skip it", zap.Int64("id", sid))
+			if !lo.Contains(segmentIDsBeforeFlush, seg.ID) {
+				segmentEntities = append(segmentEntities, seg)
 			}
 		}
-		for _, seg := range segmentEntitiesBeforeFlush {
-			sid := seg.ID
-			if _, ok := segmentDict[sid]; ok {
-				delete(segmentDict, sid)
-				unfilledSegments = append(unfilledSegments, seg)
-				//} else {
-				//	log.Info("this may be old segments before flush, skip it", zap.Int64("id", sid))
+
+		// segmentIDs
+		unfilledSegmentIDs := make([]int64, 0)
+		// union of (intersection of BeforeFlushIDs and AfterFlushIDs) and flushSegmentIDs
+		for _, seg := range segmentEntitiesAfterFlush {
+			if lo.Contains(segmentIDsBeforeFlush, seg.ID) {
+				unfilledSegmentIDs = append(unfilledSegmentIDs, seg.ID)
 			}
 		}
-		if len(segmentDict) > 0 {
-			// very rare situation, segments return in flush doesn't exist in either segmentEntitiesBeforeFlush and segmentEntitiesAfterFlush
-			errorMsg := "Segment return in Flush not exist in GetPersistentSegmentInfo. segment ids: " + fmt.Sprint(utils.MapKeyArray(segmentDict))
-			log.Warn(errorMsg)
+		for _, segID := range flushSegmentIDs {
+			if !lo.Contains(unfilledSegmentIDs, segID) {
+				unfilledSegmentIDs = append(unfilledSegmentIDs, segID)
+			}
+		}
+		unfilledSegmentIDs = append(unfilledSegmentIDs, newL0SegmentsIDs...)
+		for _, seg := range segmentEntities {
+			if lo.Contains(unfilledSegmentIDs, seg.ID) {
+				unfilledSegments = append(unfilledSegments, seg)
+			}
 		}
 	} else {
 		// Flush
@@ -483,29 +490,38 @@ func (b *BackupContext) backupCollectionPrepare(ctx context.Context, backupInfo
 		}
 		b.meta.AddPartition(partitionBackupInfo)
 	}
-	b.meta.UpdateCollection(collectionBackup.Id, collectionBackup.CollectionId, setCollectionLoadState(collectionLoadState))
+
+	l0segments, exist := partSegInfoMap[-1]
+	if exist {
+		b.meta.UpdateCollection(collectionBackup.Id, collectionBackup.CollectionId, setL0Segments(l0segments))
+	}
 
 	partitionBackupInfos := b.meta.GetPartitions(collectionBackup.CollectionId)
 	log.Info("finish build partition info",
 		zap.String("collectionName", collectionBackup.GetCollectionName()),
-		zap.Int("partitionNum", len(partitionBackupInfos)))
+		zap.Int("partitionNum", len(partitionBackupInfos)),
+		zap.Int("l0SegmentsNum", len(l0segments)))
 
 	var collectionBackupSize int64 = 0
 	for _, part := range partitionBackupInfos {
 		collectionBackupSize += part.GetSize()
 	}
 
-	b.meta.UpdateCollection(collectionBackup.Id, collectionBackup.CollectionId, setCollectionSize(collectionBackupSize))
+	b.meta.UpdateCollection(collectionBackup.Id, collectionBackup.CollectionId, setCollectionLoadState(collectionLoadState), setCollectionSize(collectionBackupSize))
 	return nil
 }
 
 func (b *BackupContext) backupCollectionExecute(ctx context.Context, collectionBackup *backuppb.CollectionBackupInfo) error {
 	log.Info("backupCollectionExecute", zap.Any("collectionMeta", collectionBackup.String()))
-
+	backupInfo := b.meta.GetBackupByCollectionID(collectionBackup.GetCollectionId())
+	backupBinlogPath := BackupBinlogDirPath(b.backupRootPath, backupInfo.GetName())
 	for _, partition := range b.meta.GetPartitions(collectionBackup.CollectionId) {
-		var segmentBackupInfos []*backuppb.SegmentBackupInfo
+		segmentBackupInfos := make([]*backuppb.SegmentBackupInfo, 0)
 		var currentSize int64 = 0
 		var groupID int64 = 1
+		// currently not group l0 segments
+		//var currentL0Size int64 = 0
+		//var l0GroupID int64 = 1
 		segments := b.meta.GetSegments(partition.GetPartitionId())
 		for _, v := range segments {
 			segment := v
@@ -514,20 +530,28 @@ func (b *BackupContext) backupCollectionExecute(ctx context.Context, collectionB
 				log.Error("Fail to fill segment backup info", zap.Error(err))
 				return err
 			}
-			if currentSize > BackupSegmentGroupMaxSizeInMB*1024*1024 { // 256MB
-				groupID++
-				currentSize = 0
+			if !segment.IsL0 {
+				if currentSize > BackupSegmentGroupMaxSizeInMB*1024*1024 { // 256MB
+					groupID++
+					currentSize = 0
+				}
+				currentSize = currentSize + segment.GetSize()
+				b.meta.UpdateSegment(segment.GetPartitionId(), segment.GetSegmentId(), setGroupID(groupID))
+			} else {
+				//if currentSize > BackupSegmentGroupMaxSizeInMB*1024*1024 { // 256MB
+				//	l0GroupID++
+				//	currentL0Size = 0
+				//}
+				//currentL0Size = currentL0Size + segment.GetSize()
+				b.meta.UpdateSegment(segment.GetPartitionId(), segment.GetSegmentId(), setGroupID(segment.GetSegmentId()))
 			}
-			currentSize = currentSize + segment.GetSize()
-			b.meta.UpdateSegment(segment.GetPartitionId(), segment.GetSegmentId(), setGroupID(groupID))
 			segmentBackupInfos = append(segmentBackupInfos, segment)
 		}
 		log.Info("Begin copy data",
 			zap.String("dbName", collectionBackup.GetDbName()),
 			zap.String("collectionName", collectionBackup.GetCollectionName()),
 			zap.Int64("collectionID", partition.GetCollectionId()),
-			zap.Int64("partitionID", partition.GetPartitionId()),
-			zap.Int("segmentNum", len(segmentBackupInfos)))
+			zap.Int64("partitionID", partition.GetPartitionId()))
 
 		sort.SliceStable(segmentBackupInfos, func(i, j int) bool {
 			return segmentBackupInfos[i].Size < segmentBackupInfos[j].Size
@@ -536,23 +560,39 @@ func (b *BackupContext) backupCollectionExecute(ctx context.Context, collectionB
 		segmentIDs := lo.Map(segmentBackupInfos, func(segment *backuppb.SegmentBackupInfo, _ int) int64 {
 			return segment.GetSegmentId()
 		})
-		err := b.copySegments(ctx, segmentIDs)
+		err := b.copySegments(ctx, backupBinlogPath, segmentIDs)
 		if err != nil {
 			return err
 		}
 	}
 
-	//collectionBackup.EndTime = time.Now().Unix()
-	b.meta.UpdateCollection(collectionBackup.Id, collectionBackup.CollectionId, setCollectionEndTime(time.Now().Unix()))
+	l0Segments := collectionBackup.GetL0Segments()
+	segmentBackupInfos := make([]*backuppb.SegmentBackupInfo, 0)
+	segmentIDs := make([]int64, 0)
+	for _, v := range l0Segments {
+		segment := v
+		err := b.fillSegmentBackupInfo(ctx, segment)
+		if err != nil {
+			log.Error("Fail to fill segment backup info", zap.Error(err))
+			return err
+		}
+		segmentIDs = append(segmentIDs, segment.GetSegmentId())
+		segmentBackupInfos = append(segmentBackupInfos, b.meta.GetSegment(segment.GetSegmentId()))
+	}
+	err := b.copySegments(ctx, backupBinlogPath, segmentIDs)
+	if err != nil {
+		log.Error("Fail to fill segment backup info", zap.Error(err))
+		return err
+	}
+	b.meta.UpdateCollection(collectionBackup.Id, collectionBackup.CollectionId, setL0Segments(segmentBackupInfos))
 
+	b.meta.UpdateCollection(collectionBackup.Id, collectionBackup.CollectionId, setCollectionEndTime(time.Now().Unix()))
 	log.Info("Finish copy data",
 		zap.String("dbName", collectionBackup.GetDbName()),
 		zap.String("collectionName", collectionBackup.GetCollectionName()))
 	return nil
 }
 
-const GC_Warn_Message = "This warn won't fail the backup process. Pause GC can protect data not to be GCed during backup, it is necessary to backup very large data(cost more than a hour)."
-
 func (b *BackupContext) pauseMilvusGC(ctx context.Context, gcAddress string, pauseSeconds int) {
 	pauseAPI := "/management/datacoord/garbage_collection/pause"
 	params := url.Values{}
@@ -613,12 +653,6 @@ func (b *BackupContext) executeCreateBackup(ctx context.Context, request *backup
 		defer b.resumeMilvusGC(ctx, gcAddress)
 	}
 
-	// not important
-	//backupInfo.BackupTimestamp = uint64(time.Now().UnixNano() / int64(time.Millisecond))
-	//backupInfo.StateCode = backuppb.BackupTaskStateCode_BACKUP_EXECUTING
-	//b.meta.UpdateBackup(backupInfo.Id, setStateCode(backuppb.BackupTaskStateCode_BACKUP_EXECUTING))
-	//defer b.updateBackup(levelInfo, backupInfo)
-
 	// 1, get collection level meta
 	toBackupCollections, err := b.parseBackupCollections(request)
 	if err != nil {
@@ -628,25 +662,16 @@ func (b *BackupContext) executeCreateBackup(ctx context.Context, request *backup
 	}
 	collectionNames := make([]string, len(toBackupCollections))
 	for i, coll := range toBackupCollections {
-		collectionNames[i] = coll.collectionName
+		collectionNames[i] = coll.db + "." + coll.collectionName
 	}
 	log.Info("collections to backup", zap.Strings("collections", collectionNames))
 
 	jobIds := make([]int64, 0)
-	//toBackupCollectionInfos := make([]*backuppb.CollectionBackupInfo, 0)
-	//toBackupCollectionInfosMutex := sync.Mutex{}
 	for _, collection := range toBackupCollections {
 		collectionClone := collection
 		job := func(ctx context.Context) error {
 			err := retry.Do(ctx, func() error {
-				err := b.backupCollectionPrepare(ctx, backupInfo, collectionClone, request.GetForce())
-				if err != nil {
-					return err
-				}
-				//toBackupCollectionInfosMutex.Lock()
-				//defer toBackupCollectionInfosMutex.Unlock()
-				//toBackupCollectionInfos = append(toBackupCollectionInfos, coll)
-				return nil
+				return b.backupCollectionPrepare(ctx, backupInfo, collectionClone, request.GetForce())
 			}, retry.Sleep(120*time.Second), retry.Attempts(128))
 			return err
 		}
@@ -655,8 +680,6 @@ func (b *BackupContext) executeCreateBackup(ctx context.Context, request *backup
 	}
 	err = b.getBackupCollectionWorkerPool().WaitJobs(jobIds)
 	if err != nil {
-		//backupInfo.StateCode = backuppb.BackupTaskStateCode_BACKUP_FAIL
-		//backupInfo.ErrorMessage = err.Error()
 		b.meta.UpdateBackup(backupInfo.Id, setStateCode(backuppb.BackupTaskStateCode_BACKUP_FAIL), setErrorMessage(err.Error()))
 		return err
 	}
@@ -679,12 +702,6 @@ func (b *BackupContext) executeCreateBackup(ctx context.Context, request *backup
 			b.meta.UpdateBackup(backupInfo.Id, setStateCode(backuppb.BackupTaskStateCode_BACKUP_FAIL), setErrorMessage(err.Error()))
 			return err
 		}
-
-		//_, err := treeToLevel(backupInfo)
-		//if err != nil {
-		//	b.meta.UpdateBackup(backupInfo.Id, setStateCode(backuppb.BackupTaskStateCode_BACKUP_FAIL), setErrorMessage(err.Error()))
-		//	return err
-		//}
 	} else {
 		log.Info("skip copy data because it is a metaOnly backup request")
 	}
@@ -711,7 +728,7 @@ func (b *BackupContext) writeBackupInfoMeta(ctx context.Context, id string) erro
 	log.Info("Final backupInfo", zap.String("backupInfo", backupInfo.String()))
 	output, _ := serialize(backupInfo)
 	log.Debug("backup meta", zap.String("value", string(output.BackupMetaBytes)))
-	log.Debug("collection meta", zap.String("value", string(output.CollectionMetaBytes)))
+	log.Info("collection meta", zap.String("value", string(output.CollectionMetaBytes)))
 	log.Debug("partition meta", zap.String("value", string(output.PartitionMetaBytes)))
 	log.Debug("segment meta", zap.String("value", string(output.SegmentMetaBytes)))
 
@@ -748,12 +765,13 @@ func (b *BackupContext) writeBackupInfoMeta(ctx context.Context, id string) erro
 	return nil
 }
 
-func (b *BackupContext) copySegments(ctx context.Context, segmentIDs []int64) error {
+func (b *BackupContext) copySegments(ctx context.Context, backupBinlogPath string, segmentIDs []int64) error {
 	jobIds := make([]int64, 0)
-	for _, segmentID := range segmentIDs {
-		segment := segmentID
+	for _, v := range segmentIDs {
+		segmentID := v
+		segment := b.meta.GetSegment(segmentID)
 		job := func(ctx context.Context) error {
-			return b.copySegment(ctx, segment)
+			return b.copySegment(ctx, backupBinlogPath, segment)
 		}
 		jobId := b.getCopyDataWorkerPool().SubmitWithId(job)
 		jobIds = append(jobIds, jobId)
@@ -763,29 +781,26 @@ func (b *BackupContext) copySegments(ctx context.Context, segmentIDs []int64) er
 	return err
 }
 
-func (b *BackupContext) copySegment(ctx context.Context, segmentID int64) error {
-	segment := b.meta.GetSegment(segmentID)
+func (b *BackupContext) copySegment(ctx context.Context, backupBinlogPath string, segment *backuppb.SegmentBackupInfo) error {
 	log := log.With(zap.Int64("collection_id", segment.GetCollectionId()),
 		zap.Int64("partition_id", segment.GetPartitionId()),
 		zap.Int64("segment_id", segment.GetSegmentId()),
 		zap.Int64("group_id", segment.GetGroupId()))
-	log.Info("copy segment")
-	backupInfo := b.meta.GetBackupBySegmentID(segmentID)
-	dstPath := BackupBinlogDirPath(b.backupRootPath, backupInfo.GetName())
+	log.Info("copy segment", zap.String("backupBinlogPath", backupBinlogPath))
 	// generate target path
 	// milvus_rootpath/insert_log/collection_id/partition_id/segment_id/ =>
 	// backup_rootpath/backup_name/binlog/insert_log/collection_id/partition_id/group_id/segment_id
 	backupPathFunc := func(binlogPath, rootPath, backupBinlogPath string) string {
 		if rootPath == "" {
-			return dstPath + SEPERATOR + binlogPath
+			return backupBinlogPath + SEPERATOR + binlogPath
 		} else {
-			return strings.Replace(binlogPath, rootPath, dstPath, 1)
+			return strings.Replace(binlogPath, rootPath, backupBinlogPath, 1)
 		}
 	}
 	// insert log
 	for _, binlogs := range segment.GetBinlogs() {
 		for _, binlog := range binlogs.GetBinlogs() {
-			targetPath := backupPathFunc(binlog.GetLogPath(), b.milvusRootPath, dstPath)
+			targetPath := backupPathFunc(binlog.GetLogPath(), b.milvusRootPath, backupBinlogPath)
 			// use segmentID as group id
 			segment.GroupId = segment.SegmentId
 			if segment.GetGroupId() != 0 {
@@ -832,7 +847,7 @@ func (b *BackupContext) copySegment(ctx context.Context, segmentID int64) error
 	// delta log
 	for _, binlogs := range segment.GetDeltalogs() {
 		for _, binlog := range binlogs.GetBinlogs() {
-			targetPath := backupPathFunc(binlog.GetLogPath(), b.milvusRootPath, dstPath)
+			targetPath := backupPathFunc(binlog.GetLogPath(), b.milvusRootPath, backupBinlogPath)
 			if segment.GetGroupId() != 0 {
 				targetPath = strings.Replace(targetPath,
 					strconv.FormatInt(segment.GetPartitionId(), 10),
@@ -890,9 +905,10 @@ func (b *BackupContext) fillSegmentBackupInfo(ctx context.Context, segmentBackup
 	insertPath := fmt.Sprintf("%s%s/%v/%v/%v/", rootPath, "insert_log", segmentBackupInfo.GetCollectionId(), segmentBackupInfo.GetPartitionId(), segmentBackupInfo.GetSegmentId())
 	log.Debug("insertPath", zap.String("bucket", b.milvusBucketName), zap.String("insertPath", insertPath))
 	fieldsLogDir, _, err := b.getStorageClient().ListWithPrefix(ctx, b.milvusBucketName, insertPath, false)
+	// handle segment level
+	isL0 := false
 	if len(fieldsLogDir) == 0 {
-		msg := fmt.Sprintf("Get empty input path, but segment should not be empty, %s", insertPath)
-		return errors.New(msg)
+		isL0 = true
 	}
 	if err != nil {
 		log.Error("Fail to list segment path", zap.String("insertPath", insertPath), zap.Error(err))
@@ -967,7 +983,8 @@ func (b *BackupContext) fillSegmentBackupInfo(ctx context.Context, segmentBackup
 	//segmentBackupInfo.Binlogs = insertLogs
 	//segmentBackupInfo.Deltalogs = deltaLogs
 	segmentBackupInfo.Size = size
-	b.meta.UpdateSegment(segmentBackupInfo.GetPartitionId(), segmentBackupInfo.GetSegmentId(), setSegmentBinlogs(insertLogs), setSegmentDeltaBinlogs(deltaLogs), setSegmentSize(size))
+	segmentBackupInfo.IsL0 = isL0
+	b.meta.UpdateSegment(segmentBackupInfo.GetPartitionId(), segmentBackupInfo.GetSegmentId(), setSegmentBinlogs(insertLogs), setSegmentDeltaBinlogs(deltaLogs), setSegmentSize(size), setSegmentL0(isL0))
 	log.Debug("fill segment info", zap.Int64("segId", segmentBackupInfo.GetSegmentId()), zap.Int64("size", size))
 	return nil
 }
diff --git a/core/backup_impl_restore_backup.go b/core/backup_impl_restore_backup.go
index 1ef83dd..b41e78b 100644
--- a/core/backup_impl_restore_backup.go
+++ b/core/backup_impl_restore_backup.go
@@ -10,6 +10,7 @@ import (
 	jsoniter "github.com/json-iterator/go"
 	gomilvus "github.com/milvus-io/milvus-sdk-go/v2/client"
 	"github.com/milvus-io/milvus-sdk-go/v2/entity"
+	"github.com/samber/lo"
 	"go.uber.org/atomic"
 	"go.uber.org/zap"
 
@@ -381,9 +382,12 @@ func (b *BackupContext) executeRestoreCollectionTask(ctx context.Context, backup
 	targetDBName := task.GetTargetDbName()
 	targetCollectionName := task.GetTargetCollectionName()
 	task.StateCode = backuppb.RestoreTaskStateCode_EXECUTING
+	log := log.With(
+		zap.String("backup_db_name", task.GetCollBackup().DbName),
+		zap.String("backup_collection_name", task.GetCollBackup().DbName),
+		zap.String("target_db_name", targetDBName),
+		zap.String("target_collection_name", targetCollectionName))
 	log.Info("start restore",
-		zap.String("db_name", targetDBName),
-		zap.String("collection_name", targetCollectionName),
 		zap.String("backupBucketName", backupBucketName),
 		zap.String("backupPath", backupPath))
 	// create collection
@@ -466,13 +470,9 @@ func (b *BackupContext) executeRestoreCollectionTask(ctx context.Context, backup
 			return task, err
 		}
 		log.Info("create collection",
-			zap.String("database", targetDBName),
-			zap.String("collectionName", targetCollectionName),
 			zap.Bool("hasPartitionKey", hasPartitionKey))
 	} else {
 		log.Info("skip create collection",
-			zap.String("database", targetDBName),
-			zap.String("collectionName", targetCollectionName),
 			zap.Bool("hasPartitionKey", hasPartitionKey))
 	}
 
@@ -484,7 +484,6 @@ func (b *BackupContext) executeRestoreCollectionTask(ctx context.Context, backup
 					strings.HasPrefix(err.Error(), "index doesn't exist") {
 					// todo
 					log.Info("field has no index",
-						zap.String("collection_name", targetCollectionName),
 						zap.String("field_name", field.Name))
 					continue
 				} else {
@@ -496,13 +495,10 @@ func (b *BackupContext) executeRestoreCollectionTask(ctx context.Context, backup
 				err = b.milvusClient.DropIndex(ctx, targetDBName, targetCollectionName, fieldIndex.Name())
 				if err != nil {
 					log.Warn("Fail to drop index",
-						zap.String("db", targetDBName),
-						zap.String("collection", targetCollectionName),
 						zap.Error(err))
 					return task, err
 				}
 				log.Info("drop index",
-					zap.String("collection_name", targetCollectionName),
 					zap.String("field_name", field.Name),
 					zap.String("index_name", fieldIndex.Name()))
 			}
@@ -563,15 +559,55 @@ func (b *BackupContext) executeRestoreCollectionTask(ctx context.Context, backup
 		}
 	}()
 
+	// bulk insert
+	copyAndBulkInsert := func(dbName, collectionName, partitionName string, files []string, isL0 bool) error {
+		realFiles := make([]string, len(files))
+		// if milvus bucket and backup bucket are not the same, should copy the data first
+		if !isSameBucket {
+			log.Info("milvus bucket and backup bucket are not the same, copy the data first", zap.Strings("files", files))
+			for i, file := range files {
+				// empty delta file, no need to copy
+				if file == "" {
+					realFiles[i] = file
+				} else {
+					log.Debug("Copy temporary restore file", zap.String("from", file), zap.String("to", tempDir+file))
+					err := retry.Do(ctx, func() error {
+						return b.getStorageClient().Copy(ctx, backupBucketName, b.milvusBucketName, file, tempDir+file)
+					}, retry.Sleep(2*time.Second), retry.Attempts(5))
+					if err != nil {
+						log.Error("fail to copy backup date from backup bucket to restore target milvus bucket after retry", zap.Error(err))
+						return err
+					}
+					realFiles[i] = tempDir + file
+				}
+			}
+		} else {
+			realFiles = files
+		}
+
+		err := b.executeBulkInsert(ctx, dbName, collectionName, partitionName, realFiles, int64(task.GetCollBackup().BackupTimestamp), isL0)
+		if err != nil {
+			log.Error("fail to bulk insert to partition",
+				zap.String("partition", partitionName),
+				zap.Error(err))
+			return err
+		}
+		return nil
+	}
+
 	jobIds := make([]int64, 0)
 	restoredSize := atomic.Int64{}
+
+	type partitionL0Segment struct {
+		collectionID  int64
+		partitionName string
+		partitionID   int64
+		segmentID     int64
+	}
+	partitionL0Segments := make([]partitionL0Segment, 0)
 	for _, v := range task.GetCollBackup().GetPartitionBackups() {
 		partitionBackup := v
-		log.Info("start restore partition",
-			zap.String("backupCollectionName", task.GetCollBackup().GetCollectionName()),
-			zap.String("targetDBName", targetDBName),
-			zap.String("targetCollectionName", targetCollectionName),
-			zap.String("partition", partitionBackup.GetPartitionName()))
+		log.Info("start restore partition", zap.String("partition", partitionBackup.GetPartitionName()))
 		// pre-check whether partition exist, if not create it
 		exist, err := b.getMilvusClient().HasPartition(ctx, targetDBName, targetCollectionName, partitionBackup.GetPartitionName())
 		if err != nil {
@@ -586,9 +622,7 @@ func (b *BackupContext) executeRestoreCollectionTask(ctx context.Context, backup
 				log.Error("fail to create partition", zap.Error(err))
 				return task, err
 			}
-			log.Info("create partition",
-				zap.String("collectionName", targetCollectionName),
-				zap.String("partitionName", partitionBackup.GetPartitionName()))
+			log.Info("create partition", zap.String("partitionName", partitionBackup.GetPartitionName()))
 		}
 
 		type restoreGroup struct {
@@ -596,15 +630,20 @@ func (b *BackupContext) executeRestoreCollectionTask(ctx context.Context, backup
 			size  int64
 		}
 		restoreFileGroups := make([]restoreGroup, 0)
-		groupIds := collectGroupIdsFromSegments(partitionBackup.GetSegmentBackups())
+
+		var l0Segments []*backuppb.SegmentBackupInfo = lo.Filter(partitionBackup.GetSegmentBackups(), func(segment *backuppb.SegmentBackupInfo, _ int) bool {
+			return segment.IsL0
+		})
+		notl0Segments := lo.Filter(partitionBackup.GetSegmentBackups(), func(segment *backuppb.SegmentBackupInfo, _ int) bool {
+			return !segment.IsL0
+		})
+		groupIds := collectGroupIdsFromSegments(notl0Segments)
 		if len(groupIds) == 1 && groupIds[0] == 0 {
 			// backward compatible old backup without group id
 			files, size, err := b.getBackupPartitionPaths(ctx, backupBucketName, backupPath, partitionBackup)
 			if err != nil {
 				log.Error("fail to get partition backup binlog files",
 					zap.Error(err),
-					zap.String("backupCollectionName", task.GetCollBackup().GetCollectionName()),
-					zap.String("targetCollectionName", targetCollectionName),
 					zap.String("partition", partitionBackup.GetPartitionName()))
 				return task, err
 			}
@@ -616,8 +655,6 @@ func (b *BackupContext) executeRestoreCollectionTask(ctx context.Context, backup
 				if err != nil {
 					log.Error("fail to get partition backup binlog files",
 						zap.Error(err),
-						zap.String("backupCollectionName", task.GetCollBackup().GetCollectionName()),
-						zap.String("targetCollectionName", targetCollectionName),
 						zap.String("partition", partitionBackup.GetPartitionName()))
 					return task, err
 				}
@@ -625,49 +662,10 @@ func (b *BackupContext) executeRestoreCollectionTask(ctx context.Context, backup
 			}
 		}
 
-		// bulk insert
-		copyAndBulkInsert := func(files []string) error {
-			realFiles := make([]string, len(files))
-			// if milvus bucket and backup bucket are not the same, should copy the data first
-			if !isSameBucket {
-				log.Info("milvus bucket and backup bucket are not the same, copy the data first", zap.Strings("files", files))
-				for i, file := range files {
-					// empty delta file, no need to copy
-					if file == "" {
-						realFiles[i] = file
-					} else {
-						log.Debug("Copy temporary restore file", zap.String("from", file), zap.String("to", tempDir+file))
-						err := retry.Do(ctx, func() error {
-							return b.getStorageClient().Copy(ctx, backupBucketName, b.milvusBucketName, file, tempDir+file)
-						}, retry.Sleep(2*time.Second), retry.Attempts(5))
-						if err != nil {
-							log.Error("fail to copy backup date from backup bucket to restore target milvus bucket after retry", zap.Error(err))
-							return err
-						}
-						realFiles[i] = tempDir + file
-					}
-				}
-			} else {
-				realFiles = files
-			}
-
-			err := b.executeBulkInsert(ctx, targetDBName, targetCollectionName, partitionBackup.GetPartitionName(), realFiles, int64(task.GetCollBackup().BackupTimestamp))
-			if err != nil {
-				log.Error("fail to bulk insert to partition",
-					zap.String("backupCollectionName", task.GetCollBackup().GetCollectionName()),
-					zap.String("targetDBName", targetDBName),
-					zap.String("targetCollectionName", targetCollectionName),
-					zap.String("partition", partitionBackup.GetPartitionName()),
-					zap.Error(err))
-				return err
-			}
-			return nil
-		}
-
 		for _, value := range restoreFileGroups {
 			group := value
 			job := func(ctx context.Context) error {
-				err := copyAndBulkInsert(group.files)
+				err := copyAndBulkInsert(targetDBName, targetCollectionName, partitionBackup.GetPartitionName(), group.files, false)
 				if err != nil {
 					return err
 				} else {
@@ -680,9 +678,52 @@ func (b *BackupContext) executeRestoreCollectionTask(ctx context.Context, backup
 			jobId := b.getRestoreWorkerPool(parentTaskID).SubmitWithId(job)
 			jobIds = append(jobIds, jobId)
 		}
+
+		if len(l0Segments) > 0 {
+			for _, segment := range l0Segments {
+				partitionL0Segments = append(partitionL0Segments, partitionL0Segment{
+					collectionID:  segment.CollectionId,
+					partitionName: partitionBackup.GetPartitionName(),
+					partitionID:   segment.GetPartitionId(),
+					segmentID:     segment.GetSegmentId(),
+				})
+			}
+		}
 	}
 
 	err := b.getRestoreWorkerPool(parentTaskID).WaitJobs(jobIds)
+	if err != nil {
+		return task, err
+	}
+
+	// restore l0 segments
+	l0JobIds := make([]int64, 0)
+	log.Info("start restore l0 segments", zap.Int("global_l0_segment_num", len(task.GetCollBackup().GetL0Segments())), zap.Int("partition_l0_segment_num", len(partitionL0Segments)))
+	for _, v := range partitionL0Segments {
+		segmentBackup := v
+		job := func(ctx context.Context) error {
+			l0Files := fmt.Sprintf("%s/%s/%s/%d/%d/%d", backupPath, BINGLOG_DIR, DELTA_LOG_DIR, segmentBackup.collectionID, segmentBackup.partitionID, segmentBackup.segmentID)
+			log.Info("restore l0 segment ", zap.String("files", l0Files))
+			return copyAndBulkInsert(targetDBName, targetCollectionName, segmentBackup.partitionName, []string{l0Files}, true)
+		}
+		jobId := b.getRestoreWorkerPool(parentTaskID).SubmitWithId(job)
+		l0JobIds = append(l0JobIds, jobId)
+	}
+
+	if len(task.GetCollBackup().GetL0Segments()) > 0 {
+		for _, v := range task.GetCollBackup().GetL0Segments() {
+			segment := v
+			job := func(ctx context.Context) error {
+				l0Files := fmt.Sprintf("%s/%s/%s/%d/%d/%d", backupPath, BINGLOG_DIR, DELTA_LOG_DIR, task.CollBackup.CollectionId, -1, segment.GetSegmentId())
+				log.Info("restore l0 segment ", zap.String("files", l0Files))
+				return copyAndBulkInsert(targetDBName, targetCollectionName, "", []string{l0Files}, true)
+			}
+			jobId := b.getRestoreWorkerPool(parentTaskID).SubmitWithId(job)
+			l0JobIds = append(l0JobIds, jobId)
+		}
+	}
+	err = b.getRestoreWorkerPool(parentTaskID).WaitJobs(l0JobIds)
+
 	return task, err
 }
 
@@ -698,7 +739,7 @@ func collectGroupIdsFromSegments(segments []*backuppb.SegmentBackupInfo) []int64
 	return res
 }
 
-func (b *BackupContext) executeBulkInsert(ctx context.Context, db, coll string, partition string, files []string, endTime int64) error {
+func (b *BackupContext) executeBulkInsert(ctx context.Context, db, coll string, partition string, files []string, endTime int64, isL0 bool) error {
 	log.Info("execute bulk insert",
 		zap.String("db", db),
 		zap.String("collection", coll),
@@ -707,10 +748,18 @@ func (b *BackupContext) executeBulkInsert(ctx context.Context, db, coll string,
 		zap.Int64("endTime", endTime))
 	var taskId int64
 	var err error
-	if endTime == 0 {
-		taskId, err = b.getMilvusClient().BulkInsert(ctx, db, coll, partition, files, gomilvus.IsBackup())
+	if isL0 {
+		if endTime == 0 {
+			taskId, err = b.getMilvusClient().BulkInsert(ctx, db, coll, partition, files, gomilvus.IsL0())
+		} else {
+			taskId, err = b.getMilvusClient().BulkInsert(ctx, db, coll, partition, files, gomilvus.IsL0(), gomilvus.WithEndTs(endTime))
+		}
 	} else {
-		taskId, err = b.getMilvusClient().BulkInsert(ctx, db, coll, partition, files, gomilvus.IsBackup(), gomilvus.WithEndTs(endTime))
+		if endTime == 0 {
+			taskId, err = b.getMilvusClient().BulkInsert(ctx, db, coll, partition, files, gomilvus.IsBackup())
+		} else {
+			taskId, err = b.getMilvusClient().BulkInsert(ctx, db, coll, partition, files, gomilvus.IsBackup(), gomilvus.WithEndTs(endTime))
+		}
 	}
 	if err != nil {
 		log.Error("fail to bulk insert",
diff --git a/core/backup_meta.go b/core/backup_meta.go
index 55e8d00..f501e3d 100644
--- a/core/backup_meta.go
+++ b/core/backup_meta.go
@@ -76,21 +76,7 @@ func treeToLevel(backup *backuppb.BackupInfo) (LeveledBackupInfo, error) {
 		}
 
 		collectionBack.Size = collectionSize
-		cloneCollectionBackup := &backuppb.CollectionBackupInfo{
-			CollectionId:            collectionBack.GetCollectionId(),
-			DbName:                  collectionBack.GetDbName(),
-			CollectionName:          collectionBack.GetCollectionName(),
-			Schema:                  collectionBack.GetSchema(),
-			ShardsNum:               collectionBack.GetShardsNum(),
-			ConsistencyLevel:        collectionBack.GetConsistencyLevel(),
-			BackupTimestamp:         collectionBack.GetBackupTimestamp(),
-			Size:                    collectionBack.GetSize(),
-			HasIndex:                collectionBack.GetHasIndex(),
-			IndexInfos:              collectionBack.GetIndexInfos(),
-			LoadState:               collectionBack.GetLoadState(),
-			BackupPhysicalTimestamp: collectionBack.GetBackupPhysicalTimestamp(),
-			ChannelCheckpoints:      collectionBack.GetChannelCheckpoints(),
-		}
+		cloneCollectionBackup := proto.Clone(collectionBack).(*backuppb.CollectionBackupInfo)
 		collections = append(collections, cloneCollectionBackup)
 		backupSize = backupSize + collectionSize
 	}
diff --git a/core/backup_meta_manager.go b/core/backup_meta_manager.go
index b28a7fb..176d9df 100644
--- a/core/backup_meta_manager.go
+++ b/core/backup_meta_manager.go
@@ -217,6 +217,12 @@ func setCollectionSize(size int64) CollectionOpt {
 	}
 }
 
+func setL0Segments(segments []*backuppb.SegmentBackupInfo) CollectionOpt {
+	return func(collection *backuppb.CollectionBackupInfo) {
+		collection.L0Segments = segments
+	}
+}
+
 func incCollectionSize(size int64) CollectionOpt {
 	return func(collection *backuppb.CollectionBackupInfo) {
 		collection.Size = collection.Size + size
@@ -361,6 +367,12 @@ func setSegmentSize(size int64) SegmentOpt {
 	}
 }
 
+func setSegmentL0(isL0 bool) SegmentOpt {
+	return func(segment *backuppb.SegmentBackupInfo) {
+		segment.IsL0 = isL0
+	}
+}
+
 func setGroupID(groupID int64) SegmentOpt {
 	return func(segment *backuppb.SegmentBackupInfo) {
 		segment.GroupId = groupID
@@ -426,6 +438,16 @@ func (meta *MetaManager) GetBackupBySegmentID(segmentID int64) *backuppb.BackupI
 	return meta.backups[backupID]
 }
 
+func (meta *MetaManager) GetBackupByCollectionID(collectionID int64) *backuppb.BackupInfo {
+	meta.mu.Lock()
+	defer meta.mu.Unlock()
+	backupID, exist := meta.collectionBackupReverse[collectionID]
+	if !exist {
+		return nil
+	}
+	return meta.backups[backupID]
+}
+
 func (meta *MetaManager) GetFullMeta(id string) *backuppb.BackupInfo {
 	meta.mu.Lock()
 	defer meta.mu.Unlock()
diff --git a/core/milvus_sdk_wrapper.go b/core/milvus_sdk_wrapper.go
index 3c9ca65..b7df559 100644
--- a/core/milvus_sdk_wrapper.go
+++ b/core/milvus_sdk_wrapper.go
@@ -2,12 +2,14 @@ package core
 
 import (
 	"context"
+	"sync"
+	"time"
+
 	"github.com/milvus-io/milvus-proto/go-api/v2/msgpb"
 	gomilvus "github.com/milvus-io/milvus-sdk-go/v2/client"
 	"github.com/milvus-io/milvus-sdk-go/v2/entity"
+
 	"github.com/zilliztech/milvus-backup/internal/util/retry"
-	"sync"
-	"time"
 )
 
 // MilvusClient wrap db into milvus API to make it thread safe
diff --git a/core/paramtable/base_table.go b/core/paramtable/base_table.go
index b73e298..0720b73 100644
--- a/core/paramtable/base_table.go
+++ b/core/paramtable/base_table.go
@@ -28,12 +28,8 @@ import (
 	memkv "github.com/zilliztech/milvus-backup/internal/kv/mem"
 	"github.com/zilliztech/milvus-backup/internal/log"
 	"github.com/zilliztech/milvus-backup/internal/util/logutil"
-	"github.com/zilliztech/milvus-backup/internal/util/typeutil"
 )
 
-// UniqueID is type alias of typeutil.UniqueID
-type UniqueID = typeutil.UniqueID
-
 const (
 	DefaultBackupYaml = "backup.yaml"
 
diff --git a/core/proto/backup.proto b/core/proto/backup.proto
index 8c1b5e3..d4685fa 100644
--- a/core/proto/backup.proto
+++ b/core/proto/backup.proto
@@ -64,6 +64,7 @@ message CollectionBackupInfo {
   // physical unix time of backup 
   uint64 backup_physical_timestamp = 19;
   map<string, string> channel_checkpoints = 20;
+  repeated SegmentBackupInfo l0_segments = 21;
 }
 
 message PartitionBackupInfo {
@@ -93,6 +94,7 @@ message SegmentBackupInfo {
   // and will bulkinsert in one call during restore
   int64 group_id = 9;
   bool backuped = 10;
+  bool is_l0 = 11;
 }
 
 /**
diff --git a/core/proto/backuppb/backup.pb.go b/core/proto/backuppb/backup.pb.go
index ba0923d..ea4af99 100644
--- a/core/proto/backuppb/backup.pb.go
+++ b/core/proto/backuppb/backup.pb.go
@@ -353,11 +353,12 @@ type CollectionBackupInfo struct {
 	IndexInfos      []*IndexInfo `protobuf:"bytes,17,rep,name=index_infos,json=indexInfos,proto3" json:"index_infos,omitempty"`
 	LoadState       string       `protobuf:"bytes,18,opt,name=load_state,json=loadState,proto3" json:"load_state,omitempty"`
 	// physical unix time of backup
-	BackupPhysicalTimestamp uint64            `protobuf:"varint,19,opt,name=backup_physical_timestamp,json=backupPhysicalTimestamp,proto3" json:"backup_physical_timestamp,omitempty"`
-	ChannelCheckpoints      map[string]string `protobuf:"bytes,20,rep,name=channel_checkpoints,json=channelCheckpoints,proto3" json:"channel_checkpoints,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
-	XXX_NoUnkeyedLiteral    struct{}          `json:"-"`
-	XXX_unrecognized        []byte            `json:"-"`
-	XXX_sizecache           int32             `json:"-"`
+	BackupPhysicalTimestamp uint64               `protobuf:"varint,19,opt,name=backup_physical_timestamp,json=backupPhysicalTimestamp,proto3" json:"backup_physical_timestamp,omitempty"`
+	ChannelCheckpoints      map[string]string    `protobuf:"bytes,20,rep,name=channel_checkpoints,json=channelCheckpoints,proto3" json:"channel_checkpoints,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	L0Segments              []*SegmentBackupInfo `protobuf:"bytes,21,rep,name=l0_segments,json=l0Segments,proto3" json:"l0_segments,omitempty"`
+	XXX_NoUnkeyedLiteral    struct{}             `json:"-"`
+	XXX_unrecognized        []byte               `json:"-"`
+	XXX_sizecache           int32                `json:"-"`
 }
 
 func (m *CollectionBackupInfo) Reset()         { *m = CollectionBackupInfo{} }
@@ -525,6 +526,13 @@ func (m *CollectionBackupInfo) GetChannelCheckpoints() map[string]string {
 	return nil
 }
 
+func (m *CollectionBackupInfo) GetL0Segments() []*SegmentBackupInfo {
+	if m != nil {
+		return m.L0Segments
+	}
+	return nil
+}
+
 type PartitionBackupInfo struct {
 	PartitionId   int64  `protobuf:"varint,1,opt,name=partition_id,json=partitionId,proto3" json:"partition_id,omitempty"`
 	PartitionName string `protobuf:"bytes,2,opt,name=partition_name,json=partitionName,proto3" json:"partition_name,omitempty"`
@@ -621,6 +629,7 @@ type SegmentBackupInfo struct {
 	// and will bulkinsert in one call during restore
 	GroupId              int64    `protobuf:"varint,9,opt,name=group_id,json=groupId,proto3" json:"group_id,omitempty"`
 	Backuped             bool     `protobuf:"varint,10,opt,name=backuped,proto3" json:"backuped,omitempty"`
+	IsL0                 bool     `protobuf:"varint,11,opt,name=is_l0,json=isL0,proto3" json:"is_l0,omitempty"`
 	XXX_NoUnkeyedLiteral struct{} `json:"-"`
 	XXX_unrecognized     []byte   `json:"-"`
 	XXX_sizecache        int32    `json:"-"`
@@ -721,6 +730,13 @@ func (m *SegmentBackupInfo) GetBackuped() bool {
 	return false
 }
 
+func (m *SegmentBackupInfo) GetIsL0() bool {
+	if m != nil {
+		return m.IsL0
+	}
+	return false
+}
+
 // *
 // root of backup
 type BackupInfo struct {
@@ -2899,195 +2915,197 @@ func init() {
 func init() { proto.RegisterFile("backup.proto", fileDescriptor_65240d19de191688) }
 
 var fileDescriptor_65240d19de191688 = []byte{
-	// 3008 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xdc, 0x5a, 0xcb, 0x6f, 0x1c, 0xc7,
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+	0x63, 0x1c, 0xd3, 0x35, 0x35, 0x51, 0xd7, 0xef, 0xe9, 0x4b, 0x62, 0x6e, 0x4f, 0xad, 0x60, 0xab,
+	0x6f, 0x05, 0xfa, 0x39, 0x41, 0x7f, 0x27, 0x08, 0xac, 0xb1, 0xbe, 0x2c, 0x46, 0xf9, 0x8c, 0x33,
+	0x5f, 0x3f, 0x4f, 0x74, 0xa8, 0x6f, 0xba, 0xbe, 0x15, 0x8c, 0x9f, 0x52, 0x3b, 0x64, 0x81, 0xee,
+	0x08, 0xcd, 0xa3, 0x58, 0x05, 0x50, 0x61, 0x31, 0x08, 0xbc, 0x73, 0x4b, 0x41, 0x87, 0xb8, 0x19,
+	0x93, 0x58, 0x8f, 0x9c, 0x83, 0x85, 0xfd, 0xa1, 0x15, 0x70, 0x9a, 0xe6, 0xee, 0x5f, 0x7f, 0x0a,
+	0x90, 0xb8, 0x60, 0x31, 0x1c, 0xb6, 0xe4, 0x7d, 0xc0, 0xd1, 0xe7, 0x50, 0x7a, 0x8c, 0x88, 0x59,
+	0xe7, 0x62, 0x68, 0x3b, 0x60, 0xc3, 0xa1, 0x80, 0xf2, 0x31, 0x1f, 0x42, 0xd4, 0xd1, 0x0b, 0x1b,
+	0x7f, 0x2a, 0xc1, 0xe2, 0x23, 0x3c, 0xf8, 0xd2, 0xf8, 0xf6, 0x69, 0xf0, 0xc2, 0xb5, 0x29, 0xb1,
+	0xa1, 0x9e, 0x7e, 0xa6, 0x20, 0xd9, 0xd7, 0xfa, 0x8c, 0x97, 0x8c, 0x95, 0xb7, 0x4e, 0xab, 0x78,
+	0xaa, 0x43, 0xd6, 0x9e, 0x23, 0x3f, 0x80, 0x5a, 0x5c, 0xd2, 0x26, 0xd9, 0x7f, 0x4c, 0x4c, 0x97,
+	0xbc, 0xcf, 0x22, 0xbe, 0x0b, 0x5a, 0xaa, 0x0e, 0x4c, 0xb2, 0x39, 0x8f, 0xd6, 0xa1, 0x57, 0xd6,
+	0x4e, 0x27, 0x8c, 0xc7, 0xa0, 0x50, 0x4f, 0x97, 0x58, 0x8f, 0xd1, 0x53, 0x46, 0x6d, 0x77, 0xe5,
+	0xda, 0x0c, 0x94, 0xf1, 0x30, 0x7d, 0x68, 0x4c, 0x24, 0xea, 0xe4, 0xda, 0xcc, 0xf5, 0xc8, 0x95,
+	0xeb, 0xb3, 0x90, 0xc6, 0x23, 0xf5, 0x00, 0x92, 0xbc, 0x9f, 0xbc, 0x7d, 0xdc, 0xa6, 0x64, 0x5c,
+	0x0c, 0xce, 0x38, 0xd0, 0x1e, 0x94, 0x30, 0x1e, 0x91, 0xec, 0xc8, 0x93, 0x8e, 0x5d, 0x2b, 0xed,
+	0x93, 0x48, 0x22, 0x89, 0x9b, 0x1f, 0x7e, 0xfe, 0x9d, 0x9e, 0x1b, 0xf6, 0x47, 0xdd, 0x75, 0x9b,
+	0x0d, 0x6e, 0xbc, 0x72, 0x3d, 0xcf, 0x7d, 0x15, 0x52, 0xbb, 0x7f, 0x43, 0x32, 0x7f, 0x5b, 0xb2,
+	0xdd, 0xb0, 0x59, 0xa0, 0xfe, 0x35, 0xbb, 0x21, 0x91, 0x61, 0xb7, 0x5b, 0xc6, 0xf6, 0xbb, 0xff,
+	0x0e, 0x00, 0x00, 0xff, 0xff, 0x33, 0x1d, 0x41, 0x89, 0xae, 0x26, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
diff --git a/example/delete_support/prepare_data.py b/example/delete_support/prepare_data.py
index cb1e842..6a20685 100644
--- a/example/delete_support/prepare_data.py
+++ b/example/delete_support/prepare_data.py
@@ -6,7 +6,6 @@
 # 5. search, query, and hybrid search on entities
 # 6. delete entities by PK
 # 7. drop collection
-import time
 import os
 import numpy as np
 from pymilvus import (
@@ -64,15 +63,6 @@
 print(fmt.format("Create collection `hello_milvus`"))
 hello_milvus = Collection("hello_milvus", schema, consistency_level="Strong")
 
-################################################################################
-# 3. insert data
-# We are going to insert 3000 rows of data into `hello_milvus`
-# Data to be inserted must be organized in fields.
-#
-# The insert() method returns:
-# - either automatically generated primary keys by Milvus if auto_id=True in the schema;
-# - or the existing primary key field from the entities if auto_id=False in the schema.
-
 print(fmt.format("Start inserting entities"))
 rng = np.random.default_rng(seed=19530)
 entities = [
@@ -84,54 +74,29 @@
 ]
 
 insert_result = hello_milvus.insert(entities)
-hello_milvus.flush()
+# hello_milvus.flush()
 
 hello_milvus.delete("pk in [0,1,2,3,4]")
-hello_milvus.flush()
+# both flush and not flush should be tested
+# hello_milvus.flush()
 
 print(f"Number of entities in hello_milvus: {hello_milvus.num_entities}")  # check the num_entites
 
-# create another collection
-fields2 = [
-    FieldSchema(name="pk", dtype=DataType.INT64, is_primary=True, auto_id=False),
-    FieldSchema(name="random", dtype=DataType.DOUBLE),
-    FieldSchema(name="var", dtype=DataType.VARCHAR, max_length=65535),
-    FieldSchema(name="embeddings", dtype=DataType.FLOAT_VECTOR, dim=dim)
-]
-
-schema2 = CollectionSchema(fields2, "hello_milvus2")
-
-print(fmt.format("Create collection `hello_milvus2`"))
-hello_milvus2 = Collection("hello_milvus2", schema2, consistency_level="Strong")
+hello_milvus2 = Collection("hello_milvus2", schema, consistency_level="Strong")
+hello_milvus2.create_partition("p1")
+hello_milvus2.create_partition("p2")
 
 entities2 = [
-    [i for i in range(num_entities)],
-    rng.random(num_entities).tolist(),  # field random, only supports list
-    [str(i) for i in range(num_entities)],
-    rng.random((num_entities, dim)),    # field embeddings, supports numpy.ndarray and list
-]
-
-insert_result2 = hello_milvus2.insert(entities2)
-hello_milvus.delete("pk in [0,1,2,3,4]")
-hello_milvus2.flush()
-
-entities3 = [
+    # provide the pk field because `auto_id` is set to False
     [i + num_entities for i in range(num_entities)],
     rng.random(num_entities).tolist(),  # field random, only supports list
     [str(i) for i in range(num_entities)],
     rng.random((num_entities, dim)),    # field embeddings, supports numpy.ndarray and list
 ]
 
-insert_result2 = hello_milvus2.insert(entities3)
-hello_milvus.delete("pk in [5,6,7,8,9]")
-hello_milvus.delete("pk in [3000,3001,3002,3003,3004]")
-hello_milvus2.flush()
-
-index_params = {"index_type": "IVF_FLAT", "params": {"nlist": 128}, "metric_type": "L2"}
-hello_milvus.create_index("embeddings", index_params)
-
-index_params2 = {"index_type": "Trie"}
-hello_milvus2.create_index("var", index_params2)
-
-print(f"Number of entities in hello_milvus2: {hello_milvus2.num_entities}")  # check the num_entites
+insert_result2 = hello_milvus2.insert(partition_name="p1", data=entities)
+insert_result3 = hello_milvus2.insert(partition_name="p2", data=entities2)
 
+hello_milvus2.delete(expr="pk in [0,1,2,3,4]", partition_name="p1")
+hello_milvus2.delete(expr="pk in [3001,3002,3003,3004]", partition_name="p2")
+hello_milvus2.flush()
\ No newline at end of file
diff --git a/example/delete_support/verify_data.py b/example/delete_support/verify_data.py
new file mode 100644
index 0000000..5d61560
--- /dev/null
+++ b/example/delete_support/verify_data.py
@@ -0,0 +1,80 @@
+import os
+import time
+import numpy as np
+from pymilvus import (
+    connections,
+    Collection,
+)
+
+fmt = "\n=== {:30} ===\n"
+dim = 8
+
+print(fmt.format("start connecting to Milvus"))
+host = os.environ.get('MILVUS_HOST')
+if host == None:
+    host = "localhost"
+print(fmt.format(f"Milvus host: {host}"))
+connections.connect("default", host=host, port="19530")
+
+hello_milvus = Collection("hello_milvus_recover")
+
+print(fmt.format("Start Creating index for recovered collection"))
+index = {
+    "index_type": "IVF_FLAT",
+    "metric_type": "L2",
+    "params": {"nlist": 128},
+}
+hello_milvus.create_index("embeddings", index)
+
+print(fmt.format("Start loading"))
+hello_milvus.load()
+# -----------------------------------------------------------------------------
+# search based on vector similarity
+print(fmt.format("Start searching based on vector similarity"))
+
+rng = np.random.default_rng(seed=19530)
+vectors_to_search = rng.random((1, dim))
+search_params = {
+    "metric_type": "L2",
+    "params": {"nprobe": 10},
+}
+
+start_time = time.time()
+
+expr = f'pk in [1, 2]'
+
+print(fmt.format(f"Start query with expr `{expr}`"))
+result = hello_milvus.query(expr=expr, output_fields=["pk", "random", "var"])
+print(len(result))
+
+
+hello_milvus2 = Collection("hello_milvus2_recover")
+
+print(fmt.format("Start Creating index for recovered collection"))
+index = {
+    "index_type": "IVF_FLAT",
+    "metric_type": "L2",
+    "params": {"nlist": 128},
+}
+hello_milvus2.create_index("embeddings", index)
+
+print(fmt.format("Start loading"))
+hello_milvus2.load()
+# -----------------------------------------------------------------------------
+# search based on vector similarity
+print(fmt.format("Start searching based on vector similarity"))
+
+rng = np.random.default_rng(seed=19530)
+vectors_to_search = rng.random((1, dim))
+search_params = {
+    "metric_type": "L2",
+    "params": {"nprobe": 10},
+}
+
+start_time = time.time()
+
+expr = f'pk in [1, 2,3,4,3001,3002,3003,3004]'
+
+print(fmt.format(f"Start query with expr `{expr}`"))
+result = hello_milvus.query(expr=expr, output_fields=["pk", "random", "var"])
+print(len(result))
\ No newline at end of file
diff --git a/go.mod b/go.mod
index 1658cf7..be128d9 100644
--- a/go.mod
+++ b/go.mod
@@ -15,7 +15,7 @@ require (
 	github.com/google/uuid v1.3.0
 	github.com/json-iterator/go v1.1.12
 	github.com/lingdor/stackerror v0.0.0-20191119040541-976d8885ed76
-	github.com/milvus-io/milvus-proto/go-api/v2 v2.4.2
+	//github.com/milvus-io/milvus-proto/go-api/v2 v2.4.3
 	github.com/milvus-io/milvus-sdk-go/v2 v2.4.0
 	github.com/minio/minio-go/v7 v7.0.61
 	github.com/pkg/errors v0.9.1
@@ -41,6 +41,8 @@ require (
 	gopkg.in/yaml.v3 v3.0.1
 )
 
+require github.com/milvus-io/milvus-proto/go-api/v2 v2.3.4-0.20240430025921-135167be0694
+
 require (
 	cloud.google.com/go v0.81.0 // indirect
 	github.com/Azure/azure-sdk-for-go/sdk/internal v1.3.0 // indirect
@@ -116,4 +118,4 @@ require (
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 )
 
-replace github.com/milvus-io/milvus-sdk-go/v2 => github.com/wayblink/milvus-sdk-go/v2 v2.4.2-cdc-rc1
+replace github.com/milvus-io/milvus-sdk-go/v2 => github.com/wayblink/milvus-sdk-go/v2 v2.3.0-beta4.0.20240607085051-1ac5aaf24c6d
diff --git a/go.sum b/go.sum
index f0cda4b..4554050 100644
--- a/go.sum
+++ b/go.sum
@@ -400,8 +400,8 @@ github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5
 github.com/mediocregopher/radix/v3 v3.4.2/go.mod h1:8FL3F6UQRXHXIBSPUs5h0RybMF8i4n7wVopoX3x7Bv8=
 github.com/microcosm-cc/bluemonday v1.0.2/go.mod h1:iVP4YcDBq+n/5fb23BhYFvIMq/leAFZyRl6bYmGDlGc=
 github.com/miekg/dns v1.0.14/go.mod h1:W1PPwlIAgtquWBMBEV9nkV9Cazfe8ScdGz/Lj7v3Nrg=
-github.com/milvus-io/milvus-proto/go-api/v2 v2.4.2 h1:jgXBS8x8DTriF2pEI0RH/A+eJ8NI1f51iJcdiYEZOBg=
-github.com/milvus-io/milvus-proto/go-api/v2 v2.4.2/go.mod h1:1OIl0v5PQeNxIJhCvY+K55CBUOYDZevw9g9380u1Wek=
+github.com/milvus-io/milvus-proto/go-api/v2 v2.3.4-0.20240430025921-135167be0694 h1:iub0yx8peGNtnb9n11iuWNmhIhIXw3xfZooIDcrfeU8=
+github.com/milvus-io/milvus-proto/go-api/v2 v2.3.4-0.20240430025921-135167be0694/go.mod h1:1OIl0v5PQeNxIJhCvY+K55CBUOYDZevw9g9380u1Wek=
 github.com/minio/md5-simd v1.1.2 h1:Gdi1DZK69+ZVMoNHRXJyNcxrMA4dSxoYHZSQbirFg34=
 github.com/minio/md5-simd v1.1.2/go.mod h1:MzdKDxYpY2BT9XQFocsiZf/NKVtR7nkE4RoEpN+20RM=
 github.com/minio/minio-go/v7 v7.0.61 h1:87c+x8J3jxQ5VUGimV9oHdpjsAvy3fhneEBKuoKEVUI=
@@ -574,8 +574,8 @@ github.com/valyala/fasthttp v1.6.0/go.mod h1:FstJa9V+Pj9vQ7OJie2qMHdwemEDaDiSdBn
 github.com/valyala/fasttemplate v1.0.1/go.mod h1:UQGH1tvbgY+Nz5t2n7tXsz52dQxojPUpymEIMZ47gx8=
 github.com/valyala/fasttemplate v1.2.1/go.mod h1:KHLXt3tVN2HBp8eijSv/kGJopbvo7S+qRAEEKiv+SiQ=
 github.com/valyala/tcplisten v0.0.0-20161114210144-ceec8f93295a/go.mod h1:v3UYOV9WzVtRmSR+PDvWpU/qWl4Wa5LApYYX4ZtKbio=
-github.com/wayblink/milvus-sdk-go/v2 v2.4.2-cdc-rc1 h1:VbJAwVv5WsnFu9kDM10pm7iegtL5Q1P+Bj6JMRSToTc=
-github.com/wayblink/milvus-sdk-go/v2 v2.4.2-cdc-rc1/go.mod h1:FGj9dlQajwW3N5BDdC12mSRPCN9/6Fi9Ah0Rom0x/7Y=
+github.com/wayblink/milvus-sdk-go/v2 v2.3.0-beta4.0.20240607085051-1ac5aaf24c6d h1:mitaOAMaGXTXnYs8+/lWTpmZ73xPhM7qM/OgGaa9qYc=
+github.com/wayblink/milvus-sdk-go/v2 v2.3.0-beta4.0.20240607085051-1ac5aaf24c6d/go.mod h1:6ckCQ8h5iFncZcaIpGE8T8sqliwaw2Eu9UzHaCURMA4=
 github.com/xeipuuv/gojsonpointer v0.0.0-20180127040702-4e3ac2762d5f/go.mod h1:N2zxlSyiKSe5eX1tZViRH5QA0qijqEDrYZiPEAiq3wU=
 github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415/go.mod h1:GwrjFmJcFw6At/Gs6z4yjiIwzuJ1/+UwLxMQDVQXShQ=
 github.com/xeipuuv/gojsonschema v1.2.0/go.mod h1:anYRn/JVcOK2ZgGU+IjEV4nwlhoK5sQluxsYJ78Id3Y=
diff --git a/internal/common/common.go b/internal/common/common.go
deleted file mode 100644
index 828ccb7..0000000
--- a/internal/common/common.go
+++ /dev/null
@@ -1,59 +0,0 @@
-// Licensed to the LF AI & Data foundation under one
-// or more contributor license agreements. See the NOTICE file
-// distributed with this work for additional information
-// regarding copyright ownership. The ASF licenses this file
-// to you under the Apache License, Version 2.0 (the
-// "License"); you may not use this file except in compliance
-// with the License. You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package common
-
-import "encoding/binary"
-
-// system filed id:
-// 0: unique row id
-// 1: timestamp
-// 100: first user field id
-// 101: second user field id
-// 102: ...
-
-const (
-	// StartOfUserFieldID represents the starting ID of the user-defined field
-	StartOfUserFieldID = 100
-
-	// RowIDField is the ID of the RowID field reserved by the system
-	RowIDField = 0
-
-	// TimeStampField is the ID of the Timestamp field reserved by the system
-	TimeStampField = 1
-
-	// RowIDFieldName defines the name of the RowID field
-	RowIDFieldName = "RowID"
-
-	// TimeStampFieldName defines the name of the Timestamp field
-	TimeStampFieldName = "Timestamp"
-
-	// DefaultShardsNum defines the default number of shards when creating a collection
-	DefaultShardsNum = int32(2)
-
-	// InvalidPartitionID indicates that the partition is not specified. It will be set when the partitionName is empty
-	InvalidPartitionID = int64(-1)
-
-	// InvalidFieldID indicates that the field does not exist . It will be set when the field is not found.
-	InvalidFieldID = int64(-1)
-
-	// NotRegisteredID means node is not registered into etcd.
-	NotRegisteredID = int64(-1)
-)
-
-// Endian is type alias of binary.LittleEndian.
-// Milvus uses little endian by default.
-var Endian = binary.LittleEndian
diff --git a/internal/kv/kv.go b/internal/kv/kv.go
index 2e9c39c..aa209a3 100644
--- a/internal/kv/kv.go
+++ b/internal/kv/kv.go
@@ -16,11 +16,6 @@
 
 package kv
 
-import (
-	"github.com/zilliztech/milvus-backup/internal/util/typeutil"
-	clientv3 "go.etcd.io/etcd/client/v3"
-)
-
 // CompareFailedError is a helper type for checking MetaKv CompareAndSwap series func error type
 type CompareFailedError struct {
 	internalError error
@@ -49,39 +44,3 @@ type BaseKV interface {
 
 	Close()
 }
-
-// TxnKV contains extra txn operations of kv. The extra operations is transactional.
-type TxnKV interface {
-	BaseKV
-	MultiSaveAndRemove(saves map[string]string, removals []string) error
-	MultiRemoveWithPrefix(keys []string) error
-	MultiSaveAndRemoveWithPrefix(saves map[string]string, removals []string) error
-}
-
-// MetaKv is TxnKV for metadata. It should save data with lease.
-type MetaKv interface {
-	TxnKV
-	GetPath(key string) string
-	LoadWithPrefix(key string) ([]string, []string, error)
-	LoadWithPrefix2(key string) ([]string, []string, []int64, error)
-	LoadWithRevisionAndVersions(key string) ([]string, []string, []int64, int64, error)
-	LoadWithRevision(key string) ([]string, []string, int64, error)
-	Watch(key string) clientv3.WatchChan
-	WatchWithPrefix(key string) clientv3.WatchChan
-	WatchWithRevision(key string, revision int64) clientv3.WatchChan
-	SaveWithLease(key, value string, id clientv3.LeaseID) error
-	SaveWithIgnoreLease(key, value string) error
-	Grant(ttl int64) (id clientv3.LeaseID, err error)
-	KeepAlive(id clientv3.LeaseID) (<-chan *clientv3.LeaseKeepAliveResponse, error)
-	CompareValueAndSwap(key, value, target string, opts ...clientv3.OpOption) (bool, error)
-	CompareVersionAndSwap(key string, version int64, target string, opts ...clientv3.OpOption) (bool, error)
-}
-
-// SnapShotKV is TxnKV for snapshot data. It must save timestamp.
-type SnapShotKV interface {
-	Save(key string, value string, ts typeutil.Timestamp) error
-	Load(key string, ts typeutil.Timestamp) (string, error)
-	MultiSave(kvs map[string]string, ts typeutil.Timestamp) error
-	LoadWithPrefix(key string, ts typeutil.Timestamp) ([]string, []string, error)
-	MultiSaveAndRemoveWithPrefix(saves map[string]string, removals []string, ts typeutil.Timestamp) error
-}
diff --git a/internal/util/typeutil/convension.go b/internal/util/typeutil/convension.go
deleted file mode 100644
index 3db8ebd..0000000
--- a/internal/util/typeutil/convension.go
+++ /dev/null
@@ -1,108 +0,0 @@
-// Licensed to the LF AI & Data foundation under one
-// or more contributor license agreements. See the NOTICE file
-// distributed with this work for additional information
-// regarding copyright ownership. The ASF licenses this file
-// to you under the Apache License, Version 2.0 (the
-// "License"); you may not use this file except in compliance
-// with the License. You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package typeutil
-
-import (
-	"encoding/binary"
-	"fmt"
-	"math"
-	"reflect"
-
-	"github.com/zilliztech/milvus-backup/internal/common"
-)
-
-// Float32ToBytes converts a float to byte slice.
-func Float32ToBytes(float float32) []byte {
-	bits := math.Float32bits(float)
-	bytes := make([]byte, 4)
-	common.Endian.PutUint32(bytes, bits)
-
-	return bytes
-}
-
-// BytesToFloat32 converts a byte slice to float32.
-func BytesToFloat32(bytes []byte) float32 {
-	bits := common.Endian.Uint32(bytes)
-
-	return math.Float32frombits(bits)
-}
-
-// BytesToInt64 converts a byte slice to uint64.
-func BytesToInt64(b []byte) (int64, error) {
-	if len(b) != 8 {
-		return 0, fmt.Errorf("failed to convert []byte to int64: invalid data, must 8 bytes, but %d", len(b))
-	}
-
-	return int64(common.Endian.Uint64(b)), nil
-}
-
-// Int64ToBytes converts uint64 to a byte slice.
-func Int64ToBytes(v int64) []byte {
-	b := make([]byte, 8)
-	common.Endian.PutUint64(b, uint64(v))
-	return b
-}
-
-// BigEndianBytesToUint64 converts a byte slice (big endian) to uint64.
-func BigEndianBytesToUint64(b []byte) (uint64, error) {
-	if len(b) != 8 {
-		return 0, fmt.Errorf("failed to convert []byte to uint64: invalid data, must 8 bytes, but %d", len(b))
-	}
-
-	// do not use little or common endian for compatibility issues(the msgid used in rocksmq is using this)
-	return binary.BigEndian.Uint64(b), nil
-}
-
-// Uint64ToBytesBigEndian converts uint64 to a byte slice(big endian).
-func Uint64ToBytesBigEndian(v uint64) []byte {
-	b := make([]byte, 8)
-	binary.BigEndian.PutUint64(b, v)
-	return b
-}
-
-// BytesToUint64 converts a byte slice to uint64.
-func BytesToUint64(b []byte) (uint64, error) {
-	if len(b) != 8 {
-		return 0, fmt.Errorf("Failed to convert []byte to uint64: invalid data, must 8 bytes, but %d", len(b))
-	}
-	return common.Endian.Uint64(b), nil
-}
-
-// Uint64ToBytes converts uint64 to a byte slice.
-func Uint64ToBytes(v uint64) []byte {
-	b := make([]byte, 8)
-	common.Endian.PutUint64(b, v)
-	return b
-}
-
-// SliceRemoveDuplicate is used to dedup a Slice
-func SliceRemoveDuplicate(a interface{}) (ret []interface{}) {
-	if reflect.TypeOf(a).Kind() != reflect.Slice {
-		fmt.Printf("input is not slice but %T\n", a)
-		return ret
-	}
-
-	va := reflect.ValueOf(a)
-	for i := 0; i < va.Len(); i++ {
-		if i > 0 && reflect.DeepEqual(va.Index(i-1).Interface(), va.Index(i).Interface()) {
-			continue
-		}
-		ret = append(ret, va.Index(i).Interface())
-	}
-
-	return ret
-}
diff --git a/internal/util/typeutil/set.go b/internal/util/typeutil/set.go
deleted file mode 100644
index 18974dc..0000000
--- a/internal/util/typeutil/set.go
+++ /dev/null
@@ -1,61 +0,0 @@
-// Licensed to the LF AI & Data foundation under one
-// or more contributor license agreements. See the NOTICE file
-// distributed with this work for additional information
-// regarding copyright ownership. The ASF licenses this file
-// to you under the Apache License, Version 2.0 (the
-// "License"); you may not use this file except in compliance
-// with the License. You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package typeutil
-
-// UniqueSet is set type, which contains only UniqueIDs,
-// the underlying type is map[UniqueID]struct{}.
-// Create a UniqueSet instance with make(UniqueSet) like creating a map instance.
-type UniqueSet map[UniqueID]struct{}
-
-// Insert elements into the set,
-// do nothing if the id existed
-func (set UniqueSet) Insert(ids ...UniqueID) {
-	for i := range ids {
-		set[ids[i]] = struct{}{}
-	}
-}
-
-// Check whether the elements exist
-func (set UniqueSet) Contain(ids ...UniqueID) bool {
-	for i := range ids {
-		_, ok := set[ids[i]]
-		if !ok {
-			return false
-		}
-	}
-
-	return true
-}
-
-// Remove elements from the set,
-// do nothing if set is nil or id not exists
-func (set UniqueSet) Remove(ids ...UniqueID) {
-	for i := range ids {
-		delete(set, ids[i])
-	}
-}
-
-// Get all elements in the set
-func (set UniqueSet) Collect() []UniqueID {
-	ids := make([]UniqueID, 0, len(set))
-
-	for id := range set {
-		ids = append(ids, id)
-	}
-
-	return ids
-}
diff --git a/internal/util/typeutil/string_util.go b/internal/util/typeutil/string_util.go
deleted file mode 100644
index 41a120f..0000000
--- a/internal/util/typeutil/string_util.go
+++ /dev/null
@@ -1,47 +0,0 @@
-// Licensed to the LF AI & Data foundation under one
-// or more contributor license agreements. See the NOTICE file
-// distributed with this work for additional information
-// regarding copyright ownership. The ASF licenses this file
-// to you under the Apache License, Version 2.0 (the
-// "License"); you may not use this file except in compliance
-// with the License. You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package typeutil
-
-import "strings"
-
-// AddOne add one to last byte in string, on empty string return empty
-// it helps with key iteration upper bound
-func AddOne(data string) string {
-	if len(data) == 0 {
-		return data
-	}
-	var datab = []byte(data)
-	if datab[len(datab)-1] != 255 {
-		datab[len(datab)-1]++
-	} else {
-		datab = append(datab, byte(0))
-	}
-	return string(datab)
-}
-
-// After get substring after sub string.
-func After(str string, sub string) string {
-	pos := strings.LastIndex(str, sub)
-	if pos == -1 {
-		return ""
-	}
-	adjustedPos := pos + len(sub)
-	if adjustedPos >= len(str) {
-		return ""
-	}
-	return str[adjustedPos:]
-}
diff --git a/internal/util/typeutil/time.go b/internal/util/typeutil/time.go
deleted file mode 100644
index bad3b97..0000000
--- a/internal/util/typeutil/time.go
+++ /dev/null
@@ -1,47 +0,0 @@
-// Licensed to the LF AI & Data foundation under one
-// or more contributor license agreements. See the NOTICE file
-// distributed with this work for additional information
-// regarding copyright ownership. The ASF licenses this file
-// to you under the Apache License, Version 2.0 (the
-// "License"); you may not use this file except in compliance
-// with the License. You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package typeutil
-
-import (
-	"math"
-	"time"
-)
-
-// MaxTimestamp is the max timestamp.
-const MaxTimestamp = Timestamp(math.MaxUint64)
-
-// ZeroTime is a zero time.
-var ZeroTime = time.Time{}
-
-// ZeroTimestamp is a zero timestamp
-var ZeroTimestamp = Timestamp(0)
-
-// ParseTimestamp returns a timestamp for a given byte slice.
-func ParseTimestamp(data []byte) (time.Time, error) {
-	//we use big endian here for compatibility issues
-	nano, err := BigEndianBytesToUint64(data)
-	if err != nil {
-		return ZeroTime, err
-	}
-
-	return time.Unix(0, int64(nano)), nil
-}
-
-// SubTimeByWallClock returns the duration between two different timestamps.
-func SubTimeByWallClock(after, before time.Time) time.Duration {
-	return time.Duration(after.UnixNano() - before.UnixNano())
-}
diff --git a/internal/util/typeutil/type.go b/internal/util/typeutil/type.go
deleted file mode 100644
index 2b6d9a5..0000000
--- a/internal/util/typeutil/type.go
+++ /dev/null
@@ -1,73 +0,0 @@
-// Licensed to the LF AI & Data foundation under one
-// or more contributor license agreements. See the NOTICE file
-// distributed with this work for additional information
-// regarding copyright ownership. The ASF licenses this file
-// to you under the Apache License, Version 2.0 (the
-// "License"); you may not use this file except in compliance
-// with the License. You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package typeutil
-
-// Timestamp is an alias of uint64
-type Timestamp = uint64
-
-// IntPrimaryKey is an alias of int64
-type IntPrimaryKey = int64
-
-// UniqueID is an alias of int64
-type UniqueID = int64
-
-const (
-	// EmbeddedRole is for embedded Milvus.
-	EmbeddedRole = "embedded"
-	// StandaloneRole is a constant represent Standalone
-	StandaloneRole = "standalone"
-	// RootCoordRole is a constant represent RootCoord
-	RootCoordRole = "rootcoord"
-	// ProxyRole is a constant represent Proxy
-	ProxyRole = "proxy"
-	// QueryCoordRole is a constant represent QueryCoord
-	QueryCoordRole = "querycoord"
-	// QueryNodeRole is a constant represent QueryNode
-	QueryNodeRole = "querynode"
-	// IndexCoordRole is a constant represent IndexCoord
-	IndexCoordRole = "indexcoord"
-	// IndexNodeRole is a constant represent IndexNode
-	IndexNodeRole = "indexnode"
-	// DataCoordRole is a constant represent DataCoord
-	DataCoordRole = "datacoord"
-	// DataNodeRole is a constant represent DataNode
-	DataNodeRole = "datanode"
-)
-
-func ServerTypeMap() map[string]interface{} {
-	return map[string]interface{}{
-		EmbeddedRole:   nil,
-		StandaloneRole: nil,
-		RootCoordRole:  nil,
-		ProxyRole:      nil,
-		QueryCoordRole: nil,
-		QueryNodeRole:  nil,
-		IndexCoordRole: nil,
-		IndexNodeRole:  nil,
-		DataCoordRole:  nil,
-		DataNodeRole:   nil,
-	}
-}
-
-func ServerTypeList() []string {
-	serverTypeMap := ServerTypeMap()
-	types := make([]string, 0, len(serverTypeMap))
-	for key := range serverTypeMap {
-		types = append(types, key)
-	}
-	return types
-}