[#437] multipart: Support removing duplicated parts

Previously after tree split we can have duplicated parts
(several objects and tree node referred to the same part number).
Some of them couldn't be deleted after abort or compete action.

Signed-off-by: Denis Kirillov <d.kirillov@yadro.com>

api/data/tree.go

@@ -124,6 +124,11 @@ type PartInfo struct {
 	Created  time.Time `json:"created"`
 }
 
+type PartInfoExtended struct {
+	PartInfo
+	Timestamp uint64
+}
+
 // ToHeaderString form short part representation to use in S3-Completed-Parts header.
 func (p *PartInfo) ToHeaderString() string {
 	// ETag value contains SHA256 checksum which is used while getting object parts attributes.

api/handler/encryption_test.go

@@ -288,6 +288,21 @@ func completeMultipartUploadBase(hc *handlerContext, bktName, objName, uploadID
 	return w
 }
 
+func abortMultipartUpload(hc *handlerContext, bktName, objName, uploadID string) {
+	w := abortMultipartUploadBase(hc, bktName, objName, uploadID)
+	assertStatus(hc.t, w, http.StatusNoContent)
+}
+
+func abortMultipartUploadBase(hc *handlerContext, bktName, objName, uploadID string) *httptest.ResponseRecorder {
+	query := make(url.Values)
+	query.Set(uploadIDQuery, uploadID)
+
+	w, r := prepareTestFullRequest(hc, bktName, objName, query, nil)
+	hc.Handler().AbortMultipartUploadHandler(w, r)
+
+	return w
+}
+
 func uploadPartEncrypted(hc *handlerContext, bktName, objName, uploadID string, num, size int) (string, []byte) {
 	return uploadPartBase(hc, bktName, objName, true, uploadID, num, size)
 }

api/handler/multipart_upload_test.go

@@ -17,6 +17,10 @@ import (
 	s3Errors "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer/encryption"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
+	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
+	oidtest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id/test"
+	usertest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/user/test"
 	"github.com/stretchr/testify/require"
 )
 
@@ -122,6 +126,108 @@ func TestMultipartReUploadPart(t *testing.T) {
 	equalDataSlices(t, append(data1, data2...), data)
 }
 
+func TestMultipartRemovePartsSplit(t *testing.T) {
+	bktName, objName := "bucket-to-upload-part", "object-multipart"
+	partSize := 8
+
+	t.Run("reupload part", func(t *testing.T) {
+		hc := prepareHandlerContext(t)
+		bktInfo := createTestBucket(hc, bktName)
+		uploadInfo := createMultipartUpload(hc, bktName, objName, map[string]string{})
+
+		uploadPart(hc, bktName, objName, uploadInfo.UploadID, 1, partSize)
+
+		multipartInfo, err := hc.tree.GetMultipartUpload(hc.Context(), bktInfo, uploadInfo.Key, uploadInfo.UploadID)
+		require.NoError(t, err)
+
+		objID := oidtest.ID()
+		_, err = hc.treeMock.AddNode(hc.Context(), bktInfo, "system", multipartInfo.ID, map[string]string{
+			"Number": "1",
+			"OID":    objID.EncodeToString(),
+			"Owner":  usertest.ID().EncodeToString(),
+			"ETag":   "etag",
+		})
+		require.NoError(t, err)
+
+		hc.tp.AddObject(bktInfo.CID.EncodeToString()+"/"+objID.EncodeToString(), object.New())
+		require.Len(t, hc.tp.Objects(), 2)
+
+		list := listParts(hc, bktName, objName, uploadInfo.UploadID, "0", http.StatusOK)
+		require.Len(t, list.Parts, 1)
+		require.Equal(t, `"etag"`, list.Parts[0].ETag)
+
+		etag1, _ := uploadPart(hc, bktName, objName, uploadInfo.UploadID, 1, partSize)
+		list = listParts(hc, bktName, objName, uploadInfo.UploadID, "0", http.StatusOK)
+		require.Len(t, list.Parts, 1)
+		require.Equal(t, etag1, list.Parts[0].ETag)
+
+		require.Len(t, hc.tp.Objects(), 1)
+	})
+
+	t.Run("abort multipart", func(t *testing.T) {
+		hc := prepareHandlerContext(t)
+		bktInfo := createTestBucket(hc, bktName)
+		uploadInfo := createMultipartUpload(hc, bktName, objName, map[string]string{})
+
+		uploadPart(hc, bktName, objName, uploadInfo.UploadID, 1, partSize)
+
+		multipartInfo, err := hc.tree.GetMultipartUpload(hc.Context(), bktInfo, uploadInfo.Key, uploadInfo.UploadID)
+		require.NoError(t, err)
+
+		objID := oidtest.ID()
+		_, err = hc.treeMock.AddNode(hc.Context(), bktInfo, "system", multipartInfo.ID, map[string]string{
+			"Number": "1",
+			"OID":    objID.EncodeToString(),
+			"Owner":  usertest.ID().EncodeToString(),
+			"ETag":   "etag",
+		})
+		require.NoError(t, err)
+
+		hc.tp.AddObject(bktInfo.CID.EncodeToString()+"/"+objID.EncodeToString(), object.New())
+		require.Len(t, hc.tp.Objects(), 2)
+
+		abortMultipartUpload(hc, bktName, objName, uploadInfo.UploadID)
+		require.Empty(t, hc.tp.Objects())
+	})
+
+	t.Run("complete multipart", func(t *testing.T) {
+		hc := prepareHandlerContext(t)
+		bktInfo := createTestBucket(hc, bktName)
+		uploadInfo := createMultipartUpload(hc, bktName, objName, map[string]string{})
+
+		etag1, _ := uploadPart(hc, bktName, objName, uploadInfo.UploadID, 1, partSize)
+
+		multipartInfo, err := hc.tree.GetMultipartUpload(hc.Context(), bktInfo, uploadInfo.Key, uploadInfo.UploadID)
+		require.NoError(t, err)
+
+		objID := oidtest.ID()
+		_, err = hc.treeMock.AddNode(hc.Context(), bktInfo, "system", multipartInfo.ID, map[string]string{
+			"Number": "1",
+			"OID":    objID.EncodeToString(),
+			"Owner":  usertest.ID().EncodeToString(),
+			"ETag":   "etag",
+		})
+		require.NoError(t, err)
+
+		hc.tp.AddObject(bktInfo.CID.EncodeToString()+"/"+objID.EncodeToString(), object.New())
+		require.Len(t, hc.tp.Objects(), 2)
+
+		completeMultipartUpload(hc, bktName, objName, uploadInfo.UploadID, []string{etag1})
+		require.Falsef(t, containsOID(hc.tp.Objects(), objID), "frostfs contains '%s' object, but shouldn't", objID)
+	})
+}
+
+func containsOID(objects []*object.Object, objID oid.ID) bool {
+	for _, o := range objects {
+		oID, _ := o.ID()
+		if oID.Equals(objID) {
+			return true
+		}
+	}
+
+	return false
+}
+
 func TestListMultipartUploads(t *testing.T) {
 	hc := prepareHandlerContext(t)
 

api/layer/multipart_upload.go

@@ -284,18 +284,21 @@ func (n *Layer) uploadPart(ctx context.Context, multipartInfo *data.MultipartInf
 		MD5:      hex.EncodeToString(md5Hash),
 	}
 
-	oldPartID, err := n.treeService.AddPart(ctx, bktInfo, multipartInfo.ID, partInfo)
+	oldPartIDs, err := n.treeService.AddPart(ctx, bktInfo, multipartInfo.ID, partInfo)
 	oldPartIDNotFound := errors.Is(err, ErrNoNodeToRemove)
 	if err != nil && !oldPartIDNotFound {
 		return nil, err
 	}
 	if !oldPartIDNotFound {
+		for _, oldPartID := range oldPartIDs {
+			fmt.Println(oldPartID.EncodeToString())
 			if err = n.objectDelete(ctx, bktInfo, oldPartID); err != nil {
 				n.reqLogger(ctx).Error(logs.CouldntDeleteOldPartObject, zap.Error(err),
 					zap.String("cid", bktInfo.CID.EncodeToString()),
 					zap.String("oid", oldPartID.EncodeToString()))
 			}
 		}
+	}
 
 	objInfo := &data.ObjectInfo{
 		ID:  id,
@@ -379,16 +382,15 @@ func (n *Layer) CompleteMultipartUpload(ctx context.Context, p *CompleteMultipar
 
 	var multipartObjetSize uint64
 	var encMultipartObjectSize uint64
-	parts := make([]*data.PartInfo, 0, len(p.Parts))
+	parts := make([]*data.PartInfoExtended, 0, len(p.Parts))
 
 	var completedPartsHeader strings.Builder
 	md5Hash := md5.New()
 	for i, part := range p.Parts {
-		partInfo := partsInfo[part.PartNumber]
+		partInfo := partsInfo.Extract(part.PartNumber, data.UnQuote(part.ETag), n.features.MD5Enabled())
-		if partInfo == nil || data.UnQuote(part.ETag) != partInfo.GetETag(n.features.MD5Enabled()) {
+		if partInfo == nil {
 			return nil, nil, fmt.Errorf("%w: unknown part %d or etag mismatched", s3errors.GetAPIError(s3errors.ErrInvalidPart), part.PartNumber)
 		}
-		delete(partsInfo, part.PartNumber)
 
 		// for the last part we have no minimum size limit
 		if i != len(p.Parts)-1 && partInfo.Size < UploadMinSize {
@@ -469,7 +471,8 @@ func (n *Layer) CompleteMultipartUpload(ctx context.Context, p *CompleteMultipar
 
 	var addr oid.Address
 	addr.SetContainer(p.Info.Bkt.CID)
-	for _, partInfo := range partsInfo {
+	for _, prts := range partsInfo {
+		for _, partInfo := range prts {
 			if err = n.objectDelete(ctx, p.Info.Bkt, partInfo.OID); err != nil {
 				n.reqLogger(ctx).Warn(logs.CouldNotDeleteUploadPart,
 					zap.Stringer("cid", p.Info.Bkt.CID), zap.Stringer("oid", &partInfo.OID),
@@ -478,6 +481,7 @@ func (n *Layer) CompleteMultipartUpload(ctx context.Context, p *CompleteMultipar
 			addr.SetObject(partInfo.OID)
 			n.cache.DeleteObject(addr)
 		}
+	}
 
 	return uploadData, extObjInfo, n.treeService.DeleteMultipartUpload(ctx, p.Info.Bkt, multipartInfo)
 }
@@ -548,12 +552,14 @@ func (n *Layer) AbortMultipartUpload(ctx context.Context, p *UploadInfoParams) e
 		return err
 	}
 
-	for _, info := range parts {
+	for _, infos := range parts {
+		for _, info := range infos {
 			if err = n.objectDelete(ctx, p.Bkt, info.OID); err != nil {
 				n.reqLogger(ctx).Warn(logs.CouldntDeletePart, zap.String("cid", p.Bkt.CID.EncodeToString()),
 					zap.String("oid", info.OID.EncodeToString()), zap.Int("part number", info.Number), zap.Error(err))
 			}
 		}
+	}
 
 	return n.treeService.DeleteMultipartUpload(ctx, p.Bkt, multipartInfo)
 }
@@ -575,7 +581,12 @@ func (n *Layer) ListParts(ctx context.Context, p *ListPartsParams) (*ListPartsIn
 
 	parts := make([]*Part, 0, len(partsInfo))
 
-	for _, partInfo := range partsInfo {
+	for _, infos := range partsInfo {
+		sort.Slice(infos, func(i, j int) bool {
+			return infos[i].Timestamp < infos[j].Timestamp
+		})
+
+		partInfo := infos[len(infos)-1]
 		parts = append(parts, &Part{
 			ETag:         data.Quote(partInfo.GetETag(n.features.MD5Enabled())),
 			LastModified: partInfo.Created.UTC().Format(time.RFC3339),
@@ -612,7 +623,22 @@ func (n *Layer) ListParts(ctx context.Context, p *ListPartsParams) (*ListPartsIn
 	return &res, nil
 }
 
-func (n *Layer) getUploadParts(ctx context.Context, p *UploadInfoParams) (*data.MultipartInfo, map[int]*data.PartInfo, error) {
+type PartsInfo map[int][]*data.PartInfoExtended
+
+func (p PartsInfo) Extract(part int, etag string, md5Enabled bool) *data.PartInfoExtended {
+	parts := p[part]
+
+	for i, info := range parts {
+		if info.GetETag(md5Enabled) == etag {
+			p[part] = append(parts[:i], parts[i+1:]...)
+			return info
+		}
+	}
+
+	return nil
+}
+
+func (n *Layer) getUploadParts(ctx context.Context, p *UploadInfoParams) (*data.MultipartInfo, PartsInfo, error) {
 	multipartInfo, err := n.treeService.GetMultipartUpload(ctx, p.Bkt, p.Key, p.UploadID)
 	if err != nil {
 		if errors.Is(err, ErrNodeNotFound) {
@@ -626,11 +652,11 @@ func (n *Layer) getUploadParts(ctx context.Context, p *UploadInfoParams) (*data.
 		return nil, nil, err
 	}
 
-	res := make(map[int]*data.PartInfo, len(parts))
+	res := make(map[int][]*data.PartInfoExtended, len(parts))
 	partsNumbers := make([]int, len(parts))
 	oids := make([]string, len(parts))
 	for i, part := range parts {
-		res[part.Number] = part
+		res[part.Number] = append(res[part.Number], part)
 		partsNumbers[i] = part.Number
 		oids[i] = part.OID.EncodeToString()
 	}

api/layer/tree_mock.go

@@ -6,6 +6,7 @@ import (
 	"io"
 	"sort"
 	"strings"
+	"time"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
@@ -33,7 +34,7 @@ type TreeServiceMock struct {
 	locks      map[string]map[uint64]*data.LockInfo
 	tags       map[string]map[uint64]map[string]string
 	multiparts map[string]map[string][]*data.MultipartInfo
-	parts      map[string]map[int]*data.PartInfo
+	parts      map[string]map[int]*data.PartInfoExtended
 }
 
 func (t *TreeServiceMock) GetObjectTaggingAndLock(ctx context.Context, bktInfo *data.BucketInfo, objVersion *data.NodeVersion) (map[string]string, *data.LockInfo, error) {
@@ -92,7 +93,7 @@ func NewTreeService() *TreeServiceMock {
 		locks:      make(map[string]map[uint64]*data.LockInfo),
 		tags:       make(map[string]map[uint64]map[string]string),
 		multiparts: make(map[string]map[string][]*data.MultipartInfo),
-		parts:      make(map[string]map[int]*data.PartInfo),
+		parts:      make(map[string]map[int]*data.PartInfoExtended),
 	}
 }
 
@@ -343,28 +344,31 @@ func (t *TreeServiceMock) GetMultipartUpload(_ context.Context, bktInfo *data.Bu
 	return nil, ErrNodeNotFound
 }
 
-func (t *TreeServiceMock) AddPart(ctx context.Context, bktInfo *data.BucketInfo, multipartNodeID uint64, info *data.PartInfo) (oldObjIDToDelete oid.ID, err error) {
+func (t *TreeServiceMock) AddPart(ctx context.Context, bktInfo *data.BucketInfo, multipartNodeID uint64, info *data.PartInfo) (oldObjIDsToDelete []oid.ID, err error) {
 	multipartInfo, err := t.GetMultipartUpload(ctx, bktInfo, info.Key, info.UploadID)
 	if err != nil {
-		return oid.ID{}, err
+		return nil, err
 	}
 
 	if multipartInfo.ID != multipartNodeID {
-		return oid.ID{}, fmt.Errorf("invalid multipart info id")
+		return nil, fmt.Errorf("invalid multipart info id")
 	}
 
 	partsMap, ok := t.parts[info.UploadID]
 	if !ok {
-		partsMap = make(map[int]*data.PartInfo)
+		partsMap = make(map[int]*data.PartInfoExtended)
 	}
 
-	partsMap[info.Number] = info
+	partsMap[info.Number] = &data.PartInfoExtended{
+		PartInfo:  *info,
+		Timestamp: uint64(time.Now().UnixMicro()),
+	}
 
 	t.parts[info.UploadID] = partsMap
-	return oid.ID{}, nil
+	return nil, nil
 }
 
-func (t *TreeServiceMock) GetParts(_ context.Context, bktInfo *data.BucketInfo, multipartNodeID uint64) ([]*data.PartInfo, error) {
+func (t *TreeServiceMock) GetParts(_ context.Context, bktInfo *data.BucketInfo, multipartNodeID uint64) ([]*data.PartInfoExtended, error) {
 	cnrMultipartsMap := t.multiparts[bktInfo.CID.EncodeToString()]
 
 	var foundMultipart *data.MultipartInfo
@@ -384,7 +388,7 @@ LOOP:
 	}
 
 	partsMap := t.parts[foundMultipart.UploadID]
-	result := make([]*data.PartInfo, 0, len(partsMap))
+	result := make([]*data.PartInfoExtended, 0, len(partsMap))
 	for _, part := range partsMap {
 		result = append(result, part)
 	}

api/layer/tree_service.go

@@ -57,11 +57,11 @@ type TreeService interface {
 	GetMultipartUpload(ctx context.Context, bktInfo *data.BucketInfo, objectName, uploadID string) (*data.MultipartInfo, error)
 
 	// AddPart puts a node to a system tree as a child of appropriate multipart upload
-	// and returns objectID of a previous part which must be deleted in FrostFS.
+	// and returns objectIDs of a previous part/s which must be deleted in FrostFS.
 	//
-	// If object id to remove is not found returns ErrNoNodeToRemove error.
+	// If object ids to remove is not found returns ErrNoNodeToRemove error.
-	AddPart(ctx context.Context, bktInfo *data.BucketInfo, multipartNodeID uint64, info *data.PartInfo) (oldObjIDToDelete oid.ID, err error)
+	AddPart(ctx context.Context, bktInfo *data.BucketInfo, multipartNodeID uint64, info *data.PartInfo) (oldObjIDsToDelete []oid.ID, err error)
-	GetParts(ctx context.Context, bktInfo *data.BucketInfo, multipartNodeID uint64) ([]*data.PartInfo, error)
+	GetParts(ctx context.Context, bktInfo *data.BucketInfo, multipartNodeID uint64) ([]*data.PartInfoExtended, error)
 
 	// Compound methods for optimizations
 

pkg/service/tree/tree.go

@@ -150,6 +150,10 @@ type NodeResponse interface {
 }
 
 func newTreeNode(nodeInfo NodeResponse) (*treeNode, error) {
+	if err := validateNodeResponse(nodeInfo); err != nil {
+		return nil, err
+	}
+
 	tNode := &treeNode{
 		ID:        nodeInfo.GetNodeID(),
 		ParentID:  nodeInfo.GetParentID(),
@@ -157,14 +161,6 @@ func newTreeNode(nodeInfo NodeResponse) (*treeNode, error) {
 		Meta:      make(map[string]string, len(nodeInfo.GetMeta())),
 	}
 
-	if len(tNode.ID) == 0 || len(tNode.ParentID) == 0 || len(tNode.TimeStamp) == 0 {
-		return nil, errors.New("invalid tree node: missing id")
-	}
-
-	if len(tNode.ID) != len(tNode.ParentID) || len(tNode.ID) != len(tNode.TimeStamp) {
-		return nil, errors.New("invalid tree node: length multiple ids mismatch")
-	}
-
 	for _, kv := range nodeInfo.GetMeta() {
 		switch kv.GetKey() {
 		case oidKV:
@@ -355,6 +351,10 @@ func newMultipartInfoFromTreeNode(log *zap.Logger, filePath string, treeNode *tr
 }
 
 func newMultipartInfo(log *zap.Logger, node NodeResponse) (*data.MultipartInfo, error) {
+	if err := validateNodeResponse(node); err != nil {
+		return nil, err
+	}
+
 	if len(node.GetNodeID()) != 1 {
 		return nil, errors.New("invalid multipart node: this is split node")
 	}
@@ -398,10 +398,36 @@ func newMultipartInfo(log *zap.Logger, node NodeResponse) (*data.MultipartInfo,
 	return multipartInfo, nil
 }
 
-func newPartInfo(node NodeResponse) (*data.PartInfo, error) {
+func validateNodeResponse(node NodeResponse) error {
-	var err error
+	ids := node.GetNodeID()
-	partInfo := &data.PartInfo{}
+	parentIDs := node.GetParentID()
+	timestamps := node.GetTimestamp()
 
+	if len(ids) == 0 || len(parentIDs) == 0 || len(timestamps) == 0 {
+		return errors.New("invalid node response: missing ids")
+	}
+
+	if len(ids) != len(parentIDs) || len(parentIDs) != len(timestamps) {
+		return errors.New("invalid node response: multiple ids length mismatch")
+	}
+
+	return nil
+}
+
+func newPartInfo(node NodeResponse) (*data.PartInfoExtended, error) {
+	if err := validateNodeResponse(node); err != nil {
+		return nil, err
+	}
+
+	if len(node.GetNodeID()) != 1 {
+		return nil, errors.New("invalid part node: this is split node")
+	}
+
+	partInfo := &data.PartInfoExtended{
+		Timestamp: node.GetTimestamp()[0],
+	}
+
+	var err error
 	for _, kv := range node.GetMeta() {
 		value := string(kv.GetValue())
 		switch kv.GetKey() {
@@ -1357,10 +1383,10 @@ func (c *Tree) GetMultipartUpload(ctx context.Context, bktInfo *data.BucketInfo,
 	return nil, layer.ErrNodeNotFound
 }
 
-func (c *Tree) AddPart(ctx context.Context, bktInfo *data.BucketInfo, multipartNodeID uint64, info *data.PartInfo) (oldObjIDToDelete oid.ID, err error) {
+func (c *Tree) AddPart(ctx context.Context, bktInfo *data.BucketInfo, multipartNodeID uint64, info *data.PartInfo) (oldObjIDsToDelete []oid.ID, err error) {
 	parts, err := c.service.GetSubTree(ctx, bktInfo, systemTree, []uint64{multipartNodeID}, 2)
 	if err != nil {
-		return oid.ID{}, err
+		return nil, err
 	}
 
 	meta := map[string]string{
@@ -1372,48 +1398,76 @@ func (c *Tree) AddPart(ctx context.Context, bktInfo *data.BucketInfo, multipartN
 		md5KV:        info.MD5,
 	}
 
+	objToDelete := make([]oid.ID, 0, 1)
+	partsToDelete := make([]uint64, 0, 1)
+	var (
+		latestPartID uint64
+		maxTimestamp uint64
+	)
+
+	multiNodeID := MultiID{multipartNodeID}
+
 	for _, part := range parts {
-		if len(part.GetNodeID()) != 1 {
+		if multiNodeID.Equal(part.GetNodeID()) {
-			// multipart parts nodeID shouldn't have multiple values
-			c.reqLogger(ctx).Warn(logs.UnexpectedMultiNodeIDsInSubTreeMultiParts,
-				zap.String("key", info.Key),
-				zap.String("upload id", info.UploadID),
-				zap.Uint64("multipart node id ", multipartNodeID),
-				zap.Uint64s("node ids", part.GetNodeID()))
-			continue
-		}
-		nodeID := part.GetNodeID()[0]
-		if nodeID == multipartNodeID {
 			continue
 		}
+
 		partInfo, err := newPartInfo(part)
 		if err != nil {
 			c.reqLogger(ctx).Warn(logs.FailedToParsePartInfo,
 				zap.String("key", info.Key),
 				zap.String("upload id", info.UploadID),
 				zap.Uint64("multipart node id ", multipartNodeID),
+				zap.Uint64s("id", part.GetNodeID()),
 				zap.Error(err))
 			continue
 		}
 		if partInfo.Number == info.Number {
-			return partInfo.OID, c.service.MoveNode(ctx, bktInfo, systemTree, nodeID, multipartNodeID, meta)
+			nodeID := part.GetNodeID()[0]
+			objToDelete = append(objToDelete, partInfo.OID)
+			partsToDelete = append(partsToDelete, nodeID)
+			timestamp := partInfo.Timestamp
+			if timestamp > maxTimestamp {
+				maxTimestamp = timestamp
+				latestPartID = nodeID
 			}
 		}
+	}
+
+	if len(objToDelete) != 0 {
+		if err = c.service.MoveNode(ctx, bktInfo, systemTree, latestPartID, multipartNodeID, meta); err != nil {
+			return nil, fmt.Errorf("move part node: %w", err)
+		}
+
+		for _, nodeID := range partsToDelete {
+			if nodeID == latestPartID {
+				continue
+			}
+			if err = c.service.RemoveNode(ctx, bktInfo, systemTree, nodeID); err != nil {
+				c.reqLogger(ctx).Warn(logs.FailedToRemoveOldPartNode,
+					zap.String("key", info.Key),
+					zap.String("upload id", info.UploadID),
+					zap.Uint64("id", nodeID))
+			}
+		}
+
+		return objToDelete, nil
+	}
 
 	if _, err = c.service.AddNode(ctx, bktInfo, systemTree, multipartNodeID, meta); err != nil {
-		return oid.ID{}, err
+		return nil, err
 	}
 
-	return oid.ID{}, layer.ErrNoNodeToRemove
+	return nil, layer.ErrNoNodeToRemove
 }
 
-func (c *Tree) GetParts(ctx context.Context, bktInfo *data.BucketInfo, multipartNodeID uint64) ([]*data.PartInfo, error) {
+func (c *Tree) GetParts(ctx context.Context, bktInfo *data.BucketInfo, multipartNodeID uint64) ([]*data.PartInfoExtended, error) {
 	parts, err := c.service.GetSubTree(ctx, bktInfo, systemTree, []uint64{multipartNodeID}, 2)
 	if err != nil {
 		return nil, err
 	}
 
-	result := make([]*data.PartInfo, 0, len(parts))
+	result := make([]*data.PartInfoExtended, 0, len(parts))
 	for _, part := range parts {
 		if len(part.GetNodeID()) != 1 {
 			// multipart parts nodeID shouldn't have multiple values

pkg/service/tree/tree_test.go

@@ -7,6 +7,7 @@ import (
 
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
 	cidtest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id/test"
+	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	oidtest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id/test"
 	usertest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/user/test"
 	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
@@ -304,3 +305,57 @@ func TestGetLatestNode(t *testing.T) {
 		})
 	}
 }
+
+func TestSplitTreeMultiparts(t *testing.T) {
+	ctx := context.Background()
+
+	memCli, err := NewTreeServiceClientMemory()
+	require.NoError(t, err)
+	treeService := NewTree(memCli, zaptest.NewLogger(t))
+
+	bktInfo := &data.BucketInfo{
+		CID: cidtest.ID(),
+	}
+
+	multipartInfo := &data.MultipartInfo{
+		Key:      "multipart",
+		UploadID: "id",
+		Meta:     map[string]string{},
+		Owner:    usertest.ID(),
+	}
+
+	err = treeService.CreateMultipartUpload(ctx, bktInfo, multipartInfo)
+	require.NoError(t, err)
+
+	multipartInfo, err = treeService.GetMultipartUpload(ctx, bktInfo, multipartInfo.Key, multipartInfo.UploadID)
+	require.NoError(t, err)
+
+	var objIDs []oid.ID
+	for i := 0; i < 2; i++ {
+		objID := oidtest.ID()
+		_, err = memCli.AddNode(ctx, bktInfo, systemTree, multipartInfo.ID, map[string]string{
+			partNumberKV: "1",
+			oidKV:        objID.EncodeToString(),
+			ownerKV:      usertest.ID().EncodeToString(),
+		})
+		require.NoError(t, err)
+		objIDs = append(objIDs, objID)
+	}
+
+	parts, err := treeService.GetParts(ctx, bktInfo, multipartInfo.ID)
+	require.NoError(t, err)
+	require.Len(t, parts, 2)
+
+	objToDeletes, err := treeService.AddPart(ctx, bktInfo, multipartInfo.ID, &data.PartInfo{
+		Key:      multipartInfo.Key,
+		UploadID: multipartInfo.UploadID,
+		Number:   1,
+		OID:      oidtest.ID(),
+	})
+	require.NoError(t, err)
+	require.EqualValues(t, objIDs, objToDeletes, "oids to delete mismatched")
+
+	parts, err = treeService.GetParts(ctx, bktInfo, multipartInfo.ID)
+	require.NoError(t, err)
+	require.Len(t, parts, 1)
+}