[#437] tree: Support removing old split system nodes

It's need to fit user expectation on deleting CORs for example.
Previously after removing cors (that was uploaded in split manner)
we can still get some data (from other node)
because deletion worked only for latest node version.

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

api/layer/cors.go

@@ -49,17 +49,19 @@ func (n *Layer) PutBucketCORS(ctx context.Context, p *PutCORSParams) error {
 		return fmt.Errorf("put system object: %w", err)
 	}
 
-	objIDToDelete, err := n.treeService.PutBucketCORS(ctx, p.BktInfo, objID)
+	objIDsToDelete, err := n.treeService.PutBucketCORS(ctx, p.BktInfo, objID)
 	objIDToDeleteNotFound := errorsStd.Is(err, ErrNoNodeToRemove)
 	if err != nil && !objIDToDeleteNotFound {
 		return err
 	}
 
 	if !objIDToDeleteNotFound {
-		if err = n.objectDelete(ctx, p.BktInfo, objIDToDelete); err != nil {
-			n.reqLogger(ctx).Error(logs.CouldntDeleteCorsObject, zap.Error(err),
-				zap.String("cnrID", p.BktInfo.CID.EncodeToString()),
-				zap.String("objID", objIDToDelete.EncodeToString()))
+		for _, id := range objIDsToDelete {
+			if err = n.objectDelete(ctx, p.BktInfo, id); err != nil {
+				n.reqLogger(ctx).Error(logs.CouldntDeleteCorsObject, zap.Error(err),
+					zap.String("cnrID", p.BktInfo.CID.EncodeToString()),
+					zap.String("objID", id.EncodeToString()))
+			}
 		}
 	}
 
@@ -81,14 +83,16 @@ func (n *Layer) GetBucketCORS(ctx context.Context, bktInfo *data.BucketInfo) (*d
 }
 
 func (n *Layer) DeleteBucketCORS(ctx context.Context, bktInfo *data.BucketInfo) error {
-	objID, err := n.treeService.DeleteBucketCORS(ctx, bktInfo)
+	objIDs, err := n.treeService.DeleteBucketCORS(ctx, bktInfo)
 	objIDNotFound := errorsStd.Is(err, ErrNoNodeToRemove)
 	if err != nil && !objIDNotFound {
 		return err
 	}
 	if !objIDNotFound {
-		if err = n.objectDelete(ctx, bktInfo, objID); err != nil {
-			return err
+		for _, id := range objIDs {
+			if err = n.objectDelete(ctx, bktInfo, id); err != nil {
+				return err
+			}
 		}
 	}
 

api/layer/tree_mock.go

@@ -124,7 +124,7 @@ func (t *TreeServiceMock) GetBucketCORS(_ context.Context, bktInfo *data.BucketI
 	return node.OID, nil
 }
 
-func (t *TreeServiceMock) PutBucketCORS(_ context.Context, bktInfo *data.BucketInfo, objID oid.ID) (oid.ID, error) {
+func (t *TreeServiceMock) PutBucketCORS(_ context.Context, bktInfo *data.BucketInfo, objID oid.ID) ([]oid.ID, error) {
 	systemMap, ok := t.system[bktInfo.CID.EncodeToString()]
 	if !ok {
 		systemMap = make(map[string]*data.BaseNodeVersion)
@@ -136,10 +136,10 @@ func (t *TreeServiceMock) PutBucketCORS(_ context.Context, bktInfo *data.BucketI
 
 	t.system[bktInfo.CID.EncodeToString()] = systemMap
 
-	return oid.ID{}, ErrNoNodeToRemove
+	return nil, ErrNoNodeToRemove
 }
 
-func (t *TreeServiceMock) DeleteBucketCORS(context.Context, *data.BucketInfo) (oid.ID, error) {
+func (t *TreeServiceMock) DeleteBucketCORS(context.Context, *data.BucketInfo) ([]oid.ID, error) {
 	panic("implement me")
 }
 

api/layer/tree_service.go

@@ -25,13 +25,13 @@ type TreeService interface {
 
 	// PutBucketCORS puts a node to a system tree and returns objectID of a previous cors config which must be deleted in FrostFS.
 	//
-	// If object id to remove is not found returns ErrNoNodeToRemove error.
-	PutBucketCORS(ctx context.Context, bktInfo *data.BucketInfo, objID oid.ID) (oid.ID, error)
+	// If object ids to remove is not found returns ErrNoNodeToRemove error.
+	PutBucketCORS(ctx context.Context, bktInfo *data.BucketInfo, objID oid.ID) ([]oid.ID, error)
 
 	// DeleteBucketCORS removes a node from a system tree and returns objID which must be deleted in FrostFS.
 	//
-	// If object id to remove is not found returns ErrNoNodeToRemove error.
-	DeleteBucketCORS(ctx context.Context, bktInfo *data.BucketInfo) (oid.ID, error)
+	// If object ids to remove is not found returns ErrNoNodeToRemove error.
+	DeleteBucketCORS(ctx context.Context, bktInfo *data.BucketInfo) ([]oid.ID, error)
 
 	GetObjectTagging(ctx context.Context, bktInfo *data.BucketInfo, objVersion *data.NodeVersion) (map[string]string, error)
 	PutObjectTagging(ctx context.Context, bktInfo *data.BucketInfo, objVersion *data.NodeVersion, tagSet map[string]string) error

internal/logs/logs.go

@@ -142,11 +142,15 @@ const (
 	CouldntCacheSubject                                  = "couldn't cache subject info"
 	UserGroupsListIsEmpty                                = "user groups list is empty, subject not found"
 	CouldntCacheUserKey                                  = "couldn't cache user key"
-	FoundSeveralBucketCorsNodes                          = "found several bucket cors nodes, latest be used"
-	FoundSeveralObjectTaggingNodes                       = "found several object tagging nodes, latest be used"
-	FoundSeveralBucketTaggingNodes                       = "found several bucket tagging nodes, latest be used"
-	FoundSeveralBucketSettingsNodes                      = "found several bucket settings nodes, latest be used"
+	ObjectTaggingNodeHasMultipleIDs                      = "object tagging node has multiple ids"
+	BucketTaggingNodeHasMultipleIDs                      = "bucket tagging node has multiple ids"
+	BucketSettingsNodeHasMultipleIDs                     = "bucket settings node has multiple ids"
+	BucketCORSNodeHasMultipleIDs                         = "bucket cors node has multiple ids"
+	FailedToRemoveOldBucketSettingsNode                  = "failed to remove old bucket settings node"
+	FailedToRemoveOldBucketTaggingNode                   = "failed to remove old bucket tagging node"
+	FailedToRemoveOldBucketCORSNode                      = "failed to remove old bucket cors node"
+	FailedToRemoveOldPartNode                            = "failed to remove old part node"
 	UnexpectedMultiNodeIDsInSubTreeMultiParts            = "unexpected multi node ids in sub tree multi parts"
-	FoundSeveralSystemNodes                              = "found several system nodes, latest be used"
+	FoundSeveralSystemNodes                              = "found several system nodes"
 	FailedToParsePartInfo                                = "failed to parse part info"
 )

pkg/service/tree/tree.go

@@ -53,6 +53,11 @@ type (
 		Meta      map[string]string
 	}
 
+	multiSystemNode struct {
+		// the first element is latest
+		nodes []*treeNode
+	}
+
 	GetNodesParams struct {
 		BktInfo    *data.BucketInfo
 		TreeID     string
@@ -268,6 +273,45 @@ func newNodeVersionFromTreeNode(log *zap.Logger, filePath string, treeNode *tree
 	return version, nil
 }
 
+func newMultiNode(nodes []NodeResponse) (*multiSystemNode, error) {
+	var (
+		err          error
+		index        int
+		maxTimestamp uint64
+	)
+
+	if len(nodes) == 0 {
+		return nil, errors.New("multi node must have at least one node")
+	}
+
+	treeNodes := make([]*treeNode, len(nodes))
+
+	for i, node := range nodes {
+		if treeNodes[i], err = newTreeNode(node); err != nil {
+			return nil, fmt.Errorf("parse system node response: %w", err)
+		}
+
+		if timestamp := getMaxTimestamp(node); timestamp > maxTimestamp {
+			index = i
+			maxTimestamp = timestamp
+		}
+	}
+
+	treeNodes[0], treeNodes[index] = treeNodes[index], treeNodes[0]
+
+	return &multiSystemNode{
+		nodes: treeNodes,
+	}, nil
+}
+
+func (m *multiSystemNode) Latest() *treeNode {
+	return m.nodes[0]
+}
+
+func (m *multiSystemNode) Old() []*treeNode {
+	return m.nodes[1:]
+}
+
 func newMultipartInfoFromTreeNode(log *zap.Logger, filePath string, treeNode *treeNode) (*data.MultipartInfo, error) {
 	uploadID, _ := treeNode.Get(uploadIDKV)
 	if uploadID == "" {
@@ -394,11 +438,13 @@ func newPartInfo(node NodeResponse) (*data.PartInfo, error) {
 }
 
 func (c *Tree) GetSettingsNode(ctx context.Context, bktInfo *data.BucketInfo) (*data.BucketSettings, error) {
-	node, err := c.getSystemNode(ctx, bktInfo, []string{settingsFileName})
+	multiNode, err := c.getSystemNode(ctx, bktInfo, settingsFileName)
 	if err != nil {
 		return nil, fmt.Errorf("couldn't get node: %w", err)
 	}
 
+	node := multiNode.Latest()
+
 	settings := &data.BucketSettings{Versioning: data.VersioningUnversioned}
 	if versioningValue, ok := node.Get(versioningKV); ok {
 		settings.Versioning = versioningValue
@@ -422,7 +468,7 @@ func (c *Tree) GetSettingsNode(ctx context.Context, bktInfo *data.BucketInfo) (*
 }
 
 func (c *Tree) PutSettingsNode(ctx context.Context, bktInfo *data.BucketInfo, settings *data.BucketSettings) error {
-	node, err := c.getSystemNode(ctx, bktInfo, []string{settingsFileName})
+	multiNode, err := c.getSystemNode(ctx, bktInfo, settingsFileName)
 	isErrNotFound := errors.Is(err, layer.ErrNodeNotFound)
 	if err != nil && !isErrNotFound {
 		return fmt.Errorf("couldn't get node: %w", err)
@@ -435,28 +481,43 @@ func (c *Tree) PutSettingsNode(ctx context.Context, bktInfo *data.BucketInfo, se
 		return err
 	}
 
-	ind := node.GetLatestNodeIndex()
-	if node.IsSplit() {
-		c.reqLogger(ctx).Warn(logs.FoundSeveralBucketSettingsNodes)
+	latest := multiNode.Latest()
+	ind := latest.GetLatestNodeIndex()
+	if latest.IsSplit() {
+		c.reqLogger(ctx).Error(logs.BucketSettingsNodeHasMultipleIDs, zap.Uint64s("ids", latest.ID))
 	}
 
-	return c.service.MoveNode(ctx, bktInfo, systemTree, node.ID[ind], 0, meta)
+	if err = c.service.MoveNode(ctx, bktInfo, systemTree, latest.ID[ind], 0, meta); err != nil {
+		return fmt.Errorf("move settings node: %w", err)
+	}
+
+	for _, node := range multiNode.Old() {
+		ind = node.GetLatestNodeIndex()
+		if node.IsSplit() {
+			c.reqLogger(ctx).Error(logs.BucketSettingsNodeHasMultipleIDs, zap.Uint64s("ids", node.ID))
+		}
+		if err = c.service.RemoveNode(ctx, bktInfo, systemTree, node.ID[ind]); err != nil {
+			c.reqLogger(ctx).Warn(logs.FailedToRemoveOldBucketSettingsNode, zap.Uint64("id", node.ID[ind]))
+		}
+	}
+
+	return nil
 }
 
 func (c *Tree) GetBucketCORS(ctx context.Context, bktInfo *data.BucketInfo) (oid.ID, error) {
-	node, err := c.getSystemNode(ctx, bktInfo, []string{corsFilename})
+	node, err := c.getSystemNode(ctx, bktInfo, corsFilename)
 	if err != nil {
 		return oid.ID{}, err
 	}
 
-	return node.ObjID, nil
+	return node.Latest().ObjID, nil
 }
 
-func (c *Tree) PutBucketCORS(ctx context.Context, bktInfo *data.BucketInfo, objID oid.ID) (oid.ID, error) {
-	node, err := c.getSystemNode(ctx, bktInfo, []string{corsFilename})
+func (c *Tree) PutBucketCORS(ctx context.Context, bktInfo *data.BucketInfo, objID oid.ID) ([]oid.ID, error) {
+	multiNode, err := c.getSystemNode(ctx, bktInfo, corsFilename)
 	isErrNotFound := errors.Is(err, layer.ErrNodeNotFound)
 	if err != nil && !isErrNotFound {
-		return oid.ID{}, fmt.Errorf("couldn't get node: %w", err)
+		return nil, fmt.Errorf("couldn't get node: %w", err)
 	}
 
 	meta := make(map[string]string)
@@ -465,35 +526,66 @@ func (c *Tree) PutBucketCORS(ctx context.Context, bktInfo *data.BucketInfo, objI
 
 	if isErrNotFound {
 		if _, err = c.service.AddNode(ctx, bktInfo, systemTree, 0, meta); err != nil {
-			return oid.ID{}, err
+			return nil, err
 		}
-		return oid.ID{}, layer.ErrNoNodeToRemove
+		return nil, layer.ErrNoNodeToRemove
 	}
 
-	ind := node.GetLatestNodeIndex()
-	if node.IsSplit() {
-		c.reqLogger(ctx).Warn(logs.FoundSeveralBucketCorsNodes)
+	latest := multiNode.Latest()
+	ind := latest.GetLatestNodeIndex()
+	if latest.IsSplit() {
+		c.reqLogger(ctx).Error(logs.BucketCORSNodeHasMultipleIDs)
 	}
 
-	return node.ObjID, c.service.MoveNode(ctx, bktInfo, systemTree, node.ID[ind], 0, meta)
+	if err = c.service.MoveNode(ctx, bktInfo, systemTree, latest.ID[ind], 0, meta); err != nil {
+		return nil, fmt.Errorf("move cors node: %w", err)
+	}
+
+	objToDelete := make([]oid.ID, 1, len(multiNode.nodes))
+	objToDelete[0] = latest.ObjID
+
+	for _, node := range multiNode.Old() {
+		ind = node.GetLatestNodeIndex()
+		if node.IsSplit() {
+			c.reqLogger(ctx).Error(logs.BucketCORSNodeHasMultipleIDs, zap.Uint64s("ids", node.ID))
+		}
+		if err = c.service.RemoveNode(ctx, bktInfo, systemTree, node.ID[ind]); err != nil {
+			c.reqLogger(ctx).Warn(logs.FailedToRemoveOldBucketCORSNode, zap.Uint64("id", node.ID[ind]))
+		} else {
+			objToDelete = append(objToDelete, node.ObjID)
+		}
+	}
+
+	return objToDelete, nil
 }
 
-func (c *Tree) DeleteBucketCORS(ctx context.Context, bktInfo *data.BucketInfo) (oid.ID, error) {
-	node, err := c.getSystemNode(ctx, bktInfo, []string{corsFilename})
-	if err != nil && !errors.Is(err, layer.ErrNodeNotFound) {
-		return oid.ID{}, err
+func (c *Tree) DeleteBucketCORS(ctx context.Context, bktInfo *data.BucketInfo) ([]oid.ID, error) {
+	multiNode, err := c.getSystemNode(ctx, bktInfo, corsFilename)
+	isErrNotFound := errors.Is(err, layer.ErrNodeNotFound)
+	if err != nil && !isErrNotFound {
+		return nil, err
 	}
 
-	if node != nil {
+	if isErrNotFound {
+		return nil, layer.ErrNoNodeToRemove
+	}
+
+	objToDelete := make([]oid.ID, len(multiNode.nodes))
+
+	for i, node := range multiNode.nodes {
 		ind := node.GetLatestNodeIndex()
 		if node.IsSplit() {
-			c.reqLogger(ctx).Warn(logs.FoundSeveralBucketCorsNodes)
+			c.reqLogger(ctx).Error(logs.BucketCORSNodeHasMultipleIDs, zap.Uint64s("ids", node.ID))
 		}
 
-		return node.ObjID, c.service.RemoveNode(ctx, bktInfo, systemTree, node.ID[ind])
+		if err = c.service.RemoveNode(ctx, bktInfo, systemTree, node.ID[ind]); err != nil {
+			return nil, fmt.Errorf("delete cors node '%d': %w", node.ID[ind], err)
+		}
+
+		objToDelete[i] = node.ObjID
 	}
 
-	return oid.ID{}, layer.ErrNoNodeToRemove
+	return objToDelete, nil
 }
 
 func (c *Tree) GetObjectTagging(ctx context.Context, bktInfo *data.BucketInfo, objVersion *data.NodeVersion) (map[string]string, error) {
@@ -541,7 +633,7 @@ func (c *Tree) PutObjectTagging(ctx context.Context, bktInfo *data.BucketInfo, o
 
 	ind := tagNode.GetLatestNodeIndex()
 	if tagNode.IsSplit() {
-		c.reqLogger(ctx).Warn(logs.FoundSeveralObjectTaggingNodes)
+		c.reqLogger(ctx).Error(logs.ObjectTaggingNodeHasMultipleIDs)
 	}
 
 	return c.service.MoveNode(ctx, bktInfo, versionTree, tagNode.ID[ind], objVersion.ID, treeTagSet)
@@ -552,14 +644,14 @@ func (c *Tree) DeleteObjectTagging(ctx context.Context, bktInfo *data.BucketInfo
 }
 
 func (c *Tree) GetBucketTagging(ctx context.Context, bktInfo *data.BucketInfo) (map[string]string, error) {
-	node, err := c.getSystemNode(ctx, bktInfo, []string{bucketTaggingFilename})
+	multiNode, err := c.getSystemNode(ctx, bktInfo, bucketTaggingFilename)
 	if err != nil {
 		return nil, err
 	}
 
 	tags := make(map[string]string)
 
-	for key, val := range node.Meta {
+	for key, val := range multiNode.Latest().Meta {
 		if strings.HasPrefix(key, userDefinedTagPrefix) {
 			tags[strings.TrimPrefix(key, userDefinedTagPrefix)] = val
 		}
@@ -569,7 +661,7 @@ func (c *Tree) GetBucketTagging(ctx context.Context, bktInfo *data.BucketInfo) (
 }
 
 func (c *Tree) PutBucketTagging(ctx context.Context, bktInfo *data.BucketInfo, tagSet map[string]string) error {
-	node, err := c.getSystemNode(ctx, bktInfo, []string{bucketTaggingFilename})
+	multiNode, err := c.getSystemNode(ctx, bktInfo, bucketTaggingFilename)
 	isErrNotFound := errors.Is(err, layer.ErrNodeNotFound)
 	if err != nil && !isErrNotFound {
 		return fmt.Errorf("couldn't get node: %w", err)
@@ -587,12 +679,27 @@ func (c *Tree) PutBucketTagging(ctx context.Context, bktInfo *data.BucketInfo, t
 		return err
 	}
 
-	ind := node.GetLatestNodeIndex()
-	if node.IsSplit() {
-		c.reqLogger(ctx).Warn(logs.FoundSeveralBucketTaggingNodes)
+	latest := multiNode.Latest()
+	ind := latest.GetLatestNodeIndex()
+	if latest.IsSplit() {
+		c.reqLogger(ctx).Error(logs.BucketTaggingNodeHasMultipleIDs, zap.Uint64s("ids", latest.ID))
 	}
 
-	return c.service.MoveNode(ctx, bktInfo, systemTree, node.ID[ind], 0, treeTagSet)
+	if err = c.service.MoveNode(ctx, bktInfo, systemTree, latest.ID[ind], 0, treeTagSet); err != nil {
+		return fmt.Errorf("move bucket tagging node: %w", err)
+	}
+
+	for _, node := range multiNode.Old() {
+		ind = node.GetLatestNodeIndex()
+		if node.IsSplit() {
+			c.reqLogger(ctx).Error(logs.BucketTaggingNodeHasMultipleIDs, zap.Uint64s("ids", node.ID))
+		}
+		if err = c.service.RemoveNode(ctx, bktInfo, systemTree, node.ID[ind]); err != nil {
+			c.reqLogger(ctx).Warn(logs.FailedToRemoveOldBucketTaggingNode, zap.Uint64("id", node.ID[ind]))
+		}
+	}
+
+	return nil
 }
 
 func (c *Tree) DeleteBucketTagging(ctx context.Context, bktInfo *data.BucketInfo) error {
@@ -615,6 +722,8 @@ func (c *Tree) getTreeNodes(ctx context.Context, bktInfo *data.BucketInfo, nodeI
 		return nil, err
 	}
 
+	// consider using map[string][]*treeNode
+	// to be able to remove unused node, that can be added during split
 	treeNodes := make(map[string]*treeNode, len(keys))
 
 	for _, s := range subtree {
@@ -689,26 +798,6 @@ func getLatestVersionNode(nodes []NodeResponse) (NodeResponse, error) {
 	return nodes[targetIndexNode], nil
 }
 
-func getLatestNode(nodes []NodeResponse) NodeResponse {
-	if len(nodes) == 0 {
-		return nil
-	}
-
-	var (
-		index        int
-		maxTimestamp uint64
-	)
-
-	for i, node := range nodes {
-		if timestamp := getMaxTimestamp(node); timestamp > maxTimestamp {
-			index = i
-			maxTimestamp = timestamp
-		}
-	}
-
-	return nodes[index]
-}
-
 func getMaxTimestamp(node NodeResponse) uint64 {
 	var maxTimestamp uint64
 
@@ -1558,11 +1647,11 @@ func metaFromMultipart(info *data.MultipartInfo, fileName string) map[string]str
 	return info.Meta
 }
 
-func (c *Tree) getSystemNode(ctx context.Context, bktInfo *data.BucketInfo, path []string) (*treeNode, error) {
+func (c *Tree) getSystemNode(ctx context.Context, bktInfo *data.BucketInfo, name string) (*multiSystemNode, error) {
 	p := &GetNodesParams{
 		BktInfo:    bktInfo,
 		TreeID:     systemTree,
-		Path:       path,
+		Path:       []string{name},
 		LatestOnly: false,
 		AllAttrs:   true,
 	}
@@ -1577,10 +1666,10 @@ func (c *Tree) getSystemNode(ctx context.Context, bktInfo *data.BucketInfo, path
 		return nil, layer.ErrNodeNotFound
 	}
 	if len(nodes) != 1 {
-		c.reqLogger(ctx).Warn(logs.FoundSeveralSystemNodes, zap.String("path", strings.Join(path, "/")))
+		c.reqLogger(ctx).Warn(logs.FoundSeveralSystemNodes, zap.String("name", name))
 	}
 
-	return newTreeNode(getLatestNode(nodes))
+	return newMultiNode(nodes)
 }
 
 func filterMultipartNodes(nodes []NodeResponse) []NodeResponse {