cmd/frostfs-cli/modules/object/nodes.go

@@ -1,19 +1,22 @@
 package object
 
 import (
+	"bytes"
+	"cmp"
 	"context"
 	"crypto/ecdsa"
 	"encoding/hex"
+	"encoding/json"
 	"errors"
 	"fmt"
-	"strconv"
+	"slices"
 	"sync"
-	"text/tabwriter"
 
 	internalclient "git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-cli/internal/client"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-cli/internal/commonflags"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-cli/internal/key"
 	commonCmd "git.frostfs.info/TrueCloudLab/frostfs-node/cmd/internal/common"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/policy"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/network"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object_manager/placement"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client"
@@ -32,16 +35,40 @@ const (
 
 var errNoAvailableEndpoint = errors.New("failed to create client: no available endpoint")
 
-type objectNodesInfo struct {
+type phyObject struct {
 	containerID               cid.ID
 	objectID                  oid.ID
-	relatedObjectIDs  []oid.ID
+	storedOnAllContainerNodes bool
-	isLockOrTombstone bool
+	ecHeader                  *ecHeader
 }
 
-type boolError struct {
+type ecHeader struct {
-	value bool
+	index  uint32
-	err   error
+	parent oid.ID
+}
+
+type objectPlacement struct {
+	requiredNodes  []netmapSDK.NodeInfo
+	confirmedNodes []netmapSDK.NodeInfo
+}
+
+type objectNodesResult struct {
+	errors     []error
+	placements map[oid.ID]objectPlacement
+}
+
+type ObjNodesDataObject struct {
+	ObjectID         string   `json:"object_id"`
+	RequiredNodes    []string `json:"required_nodes,omitempty"`
+	ConfirmedNodes   []string `json:"confirmed_nodes,omitempty"`
+	ECParentObjectID *string  `json:"ec_parent_object_id,omitempty"`
+	ECIndex          *uint32  `json:"ec_index,omitempty"`
+}
+
+type objNodesResultJSON struct {
+	ObjectID    string               `json:"object_id"`
+	DataObjects []ObjNodesDataObject `json:"data_objects,omitempty"`
+	Errors      []string             `json:"errors,omitempty"`
 }
 
 var objectNodesCmd = &cobra.Command{
@@ -49,7 +76,7 @@ var objectNodesCmd = &cobra.Command{
 	Short: "List of nodes where the object is stored",
 	Long: `List of nodes where the object should be stored and where it is actually stored.
 	Lock objects must exist on all nodes of the container.
-	For complex objects, a node is considered to store an object if the node stores at least one part of the complex object.
+	For complex and EC objects, a node is considered to store an object if the node stores at least one part of the complex object or one chunk of the EC object.
 	By default, the actual storage of the object is checked only on the nodes that should store the object. To check all nodes, use the flag --verify-presence-all.`,
 	Run: objectNodes,
 }
@@ -65,7 +92,8 @@ func initObjectNodesCmd() {
 	flags.String(commonflags.OIDFlag, "", commonflags.OIDFlagUsage)
 	_ = objectGetCmd.MarkFlagRequired(commonflags.OIDFlag)
 
-	flags.Bool("verify-presence-all", false, "Verify the actual presence of the object on all netmap nodes")
+	flags.Bool(verifyPresenceAllFlag, false, "Verify the actual presence of the object on all netmap nodes.")
+	flags.Bool(commonflags.JSON, false, "Print information about the object placement as json.")
 }
 
 func objectNodes(cmd *cobra.Command, _ []string) {
@@ -76,18 +104,18 @@ func objectNodes(cmd *cobra.Command, _ []string) {
 	pk := key.GetOrGenerate(cmd)
 	cli := internalclient.GetSDKClientByFlag(cmd, pk, commonflags.RPC)
 
-	objectInfo := getObjectInfo(cmd, cnrID, objID, cli, pk)
+	objects := getPhyObjects(cmd, cnrID, objID, cli, pk)
 
 	placementPolicy, netmap := getPlacementPolicyAndNetmap(cmd, cnrID, cli)
 
-	requiredPlacement := getRequiredPlacement(cmd, objectInfo, placementPolicy, netmap)
+	result := getRequiredPlacement(cmd, objects, placementPolicy, netmap)
 
-	actualPlacement := getActualPlacement(cmd, netmap, requiredPlacement, pk, objectInfo)
+	getActualPlacement(cmd, netmap, pk, objects, result)
 
-	printPlacement(cmd, netmap, requiredPlacement, actualPlacement)
+	printPlacement(cmd, objID, objects, result)
 }
 
-func getObjectInfo(cmd *cobra.Command, cnrID cid.ID, objID oid.ID, cli *client.Client, pk *ecdsa.PrivateKey) *objectNodesInfo {
+func getPhyObjects(cmd *cobra.Command, cnrID cid.ID, objID oid.ID, cli *client.Client, pk *ecdsa.PrivateKey) []phyObject {
 	var addrObj oid.Address
 	addrObj.SetContainer(cnrID)
 	addrObj.SetObject(objID)
@@ -102,44 +130,103 @@ func getObjectInfo(cmd *cobra.Command, cnrID cid.ID, objID oid.ID, cli *client.C
 
 	res, err := internalclient.HeadObject(cmd.Context(), prmHead)
 	if err == nil {
-		return &objectNodesInfo{
+		obj := phyObject{
 			containerID: cnrID,
 			objectID:    objID,
-			isLockOrTombstone: res.Header().Type() == objectSDK.TypeLock || res.Header().Type() == objectSDK.TypeTombstone,
+			storedOnAllContainerNodes: res.Header().Type() == objectSDK.TypeLock ||
+				res.Header().Type() == objectSDK.TypeTombstone ||
+				len(res.Header().Children()) > 0,
 		}
+		if res.Header().ECHeader() != nil {
+			obj.ecHeader = &ecHeader{
+				index:  res.Header().ECHeader().Index(),
+				parent: res.Header().ECHeader().Parent(),
+			}
+		}
+		return []phyObject{obj}
 	}
 
 	var errSplitInfo *objectSDK.SplitInfoError
+	if errors.As(err, &errSplitInfo) {
+		return getComplexObjectParts(cmd, cnrID, objID, cli, prmHead, errSplitInfo)
+	}
 
-	if !errors.As(err, &errSplitInfo) {
+	var ecInfoError *objectSDK.ECInfoError
+	if errors.As(err, &ecInfoError) {
+		return getECObjectChunks(cmd, cnrID, objID, ecInfoError)
+	}
 	commonCmd.ExitOnErr(cmd, "failed to get object info: %w", err)
 	return nil
-	}
+}
 
+func getComplexObjectParts(cmd *cobra.Command, cnrID cid.ID, objID oid.ID, cli *client.Client, prmHead internalclient.HeadObjectPrm, errSplitInfo *objectSDK.SplitInfoError) []phyObject {
+	members := getCompexObjectMembers(cmd, cnrID, objID, cli, prmHead, errSplitInfo)
+	return flattenComplexMembersIfECContainer(cmd, cnrID, members, prmHead)
+}
+
+func getCompexObjectMembers(cmd *cobra.Command, cnrID cid.ID, objID oid.ID, cli *client.Client, prmHead internalclient.HeadObjectPrm, errSplitInfo *objectSDK.SplitInfoError) []oid.ID {
 	splitInfo := errSplitInfo.SplitInfo()
 
-	if members, ok := tryGetSplitMembersByLinkingObject(cmd, splitInfo, prmHead, cnrID); ok {
+	if members, ok := tryGetSplitMembersByLinkingObject(cmd, splitInfo, prmHead, cnrID, false); ok {
-		return &objectNodesInfo{
+		return members
-			containerID:      cnrID,
-			objectID:         objID,
-			relatedObjectIDs: members,
-		}
 	}
 
 	if members, ok := tryGetSplitMembersBySplitID(cmd, splitInfo, cli, cnrID); ok {
-		return &objectNodesInfo{
+		return members
-			containerID:      cnrID,
-			objectID:         objID,
-			relatedObjectIDs: members,
-		}
 	}
 
-	members := tryRestoreChainInReverse(cmd, splitInfo, prmHead, cli, cnrID, objID)
+	return tryRestoreChainInReverse(cmd, splitInfo, prmHead, cli, cnrID, objID)
-	return &objectNodesInfo{
+}
+
+func flattenComplexMembersIfECContainer(cmd *cobra.Command, cnrID cid.ID, members []oid.ID, prmHead internalclient.HeadObjectPrm) []phyObject {
+	result := make([]phyObject, 0, len(members))
+	var addrObj oid.Address
+	addrObj.SetContainer(cnrID)
+	prmHead.SetRawFlag(true) // to get an error instead of whole object
+	for _, partObjID := range members {
+		addrObj.SetObject(partObjID)
+		prmHead.SetAddress(addrObj)
+
+		_, err := internalclient.HeadObject(cmd.Context(), prmHead)
+		var ecInfoError *objectSDK.ECInfoError
+		if errors.As(err, &ecInfoError) {
+			chunks := getECObjectChunks(cmd, cnrID, partObjID, ecInfoError)
+			result = append(result, chunks...)
+			continue
+		} else if err == nil { // not EC object, so all members must be phy objects
+			for _, member := range members {
+				result = append(result, phyObject{
 					containerID: cnrID,
-		objectID:         objID,
+					objectID:    member,
-		relatedObjectIDs: members,
+				})
 			}
+			break
+		}
+		commonCmd.ExitOnErr(cmd, "failed to read EC chunk of complex object: %w", err)
+	}
+	return result
+}
+
+func getECObjectChunks(cmd *cobra.Command, cnrID cid.ID, objID oid.ID, errECInfo *objectSDK.ECInfoError) []phyObject {
+	ecInfo := errECInfo.ECInfo()
+	result := make([]phyObject, 0, len(ecInfo.Chunks))
+	for _, ch := range ecInfo.Chunks {
+		var chID oid.ID
+		err := chID.ReadFromV2(ch.ID)
+		if err != nil {
+			commonCmd.ExitOnErr(cmd, "failed to read EC chunk ID %w", err)
+			return nil
+		}
+		result = append(result, phyObject{
+			containerID: cnrID,
+			objectID:    chID,
+			ecHeader: &ecHeader{
+				index:  ch.Index,
+				parent: objID,
+			},
+		})
+	}
+	return result
 }
 
 func getPlacementPolicyAndNetmap(cmd *cobra.Command, cnrID cid.ID, cli *client.Client) (placementPolicy netmapSDK.PlacementPolicy, netmap *netmapSDK.NetMap) {
@@ -184,51 +271,86 @@ func getNetMap(ctx context.Context, cli *client.Client) (*netmapSDK.NetMap, erro
 	return &nm, nil
 }
 
-func getRequiredPlacement(cmd *cobra.Command, objInfo *objectNodesInfo, placementPolicy netmapSDK.PlacementPolicy, netmap *netmapSDK.NetMap) map[uint64]netmapSDK.NodeInfo {
+func getRequiredPlacement(cmd *cobra.Command, objects []phyObject, placementPolicy netmapSDK.PlacementPolicy, netmap *netmapSDK.NetMap) *objectNodesResult {
-	nodes := make(map[uint64]netmapSDK.NodeInfo)
+	if policy.IsECPlacement(placementPolicy) {
+		return getECRequiredPlacement(cmd, objects, placementPolicy, netmap)
+	}
+	return getReplicaRequiredPlacement(cmd, objects, placementPolicy, netmap)
+}
+
+func getReplicaRequiredPlacement(cmd *cobra.Command, objects []phyObject, placementPolicy netmapSDK.PlacementPolicy, netmap *netmapSDK.NetMap) *objectNodesResult {
+	result := &objectNodesResult{
+		placements: make(map[oid.ID]objectPlacement),
+	}
 	placementBuilder := placement.NewNetworkMapBuilder(netmap)
-	placement, err := placementBuilder.BuildPlacement(objInfo.containerID, &objInfo.objectID, placementPolicy)
+	for _, object := range objects {
-	commonCmd.ExitOnErr(cmd, "failed to get required placement: %w", err)
+		placement, err := placementBuilder.BuildPlacement(object.containerID, &object.objectID, placementPolicy)
+		commonCmd.ExitOnErr(cmd, "failed to get required placement for object: %w", err)
 		for repIdx, rep := range placement {
 			numOfReplicas := placementPolicy.ReplicaDescriptor(repIdx).NumberOfObjects()
 			var nodeIdx uint32
 			for _, n := range rep {
-			if !objInfo.isLockOrTombstone && nodeIdx == numOfReplicas { // lock and tombstone objects should be on all container nodes
+				if !object.storedOnAllContainerNodes && nodeIdx == numOfReplicas {
 					break
 				}
-			nodes[n.Hash()] = n
+
+				op := result.placements[object.objectID]
+				op.requiredNodes = append(op.requiredNodes, n)
+				result.placements[object.objectID] = op
+
 				nodeIdx++
 			}
 		}
-
-	for _, relatedObjID := range objInfo.relatedObjectIDs {
-		placement, err = placementBuilder.BuildPlacement(objInfo.containerID, &relatedObjID, placementPolicy)
-		commonCmd.ExitOnErr(cmd, "failed to get required placement for related object: %w", err)
-		for _, rep := range placement {
-			for _, n := range rep {
-				nodes[n.Hash()] = n
-			}
-		}
 	}
 
-	return nodes
+	return result
 }
 
-func getActualPlacement(cmd *cobra.Command, netmap *netmapSDK.NetMap, requiredPlacement map[uint64]netmapSDK.NodeInfo,
+func getECRequiredPlacement(cmd *cobra.Command, objects []phyObject, placementPolicy netmapSDK.PlacementPolicy, netmap *netmapSDK.NetMap) *objectNodesResult {
-	pk *ecdsa.PrivateKey, objInfo *objectNodesInfo,
+	result := &objectNodesResult{
-) map[uint64]boolError {
+		placements: make(map[oid.ID]objectPlacement),
-	result := make(map[uint64]boolError)
+	}
+	for _, object := range objects {
+		getECRequiredPlacementInternal(cmd, object, placementPolicy, netmap, result)
+	}
+	return result
+}
+
+func getECRequiredPlacementInternal(cmd *cobra.Command, object phyObject, placementPolicy netmapSDK.PlacementPolicy, netmap *netmapSDK.NetMap, result *objectNodesResult) {
+	placementObjectID := object.objectID
+	if object.ecHeader != nil {
+		placementObjectID = object.ecHeader.parent
+	}
+	placementBuilder := placement.NewNetworkMapBuilder(netmap)
+	placement, err := placementBuilder.BuildPlacement(object.containerID, &placementObjectID, placementPolicy)
+	commonCmd.ExitOnErr(cmd, "failed to get required placement: %w", err)
+
+	for _, vector := range placement {
+		if object.storedOnAllContainerNodes {
+			for _, node := range vector {
+				op := result.placements[object.objectID]
+				op.requiredNodes = append(op.requiredNodes, node)
+				result.placements[object.objectID] = op
+			}
+			continue
+		}
+
+		if object.ecHeader != nil {
+			chunkIdx := int(object.ecHeader.index)
+			nodeIdx := chunkIdx % len(vector)
+			node := vector[nodeIdx]
+
+			op := result.placements[object.objectID]
+			op.requiredNodes = append(op.requiredNodes, node)
+			result.placements[object.objectID] = op
+		}
+	}
+}
+
+func getActualPlacement(cmd *cobra.Command, netmap *netmapSDK.NetMap, pk *ecdsa.PrivateKey, objects []phyObject, result *objectNodesResult) {
 	resultMtx := &sync.Mutex{}
 
-	var candidates []netmapSDK.NodeInfo
+	candidates := getNodesToCheckObjectExistance(cmd, netmap, result)
-	checkAllNodes, _ := cmd.Flags().GetBool(verifyPresenceAllFlag)
-	if checkAllNodes {
-		candidates = netmap.Nodes()
-	} else {
-		for _, n := range requiredPlacement {
-			candidates = append(candidates, n)
-		}
-	}
 
 	eg, egCtx := errgroup.WithContext(cmd.Context())
 	for _, cand := range candidates {
@@ -239,33 +361,24 @@ func getActualPlacement(cmd *cobra.Command, netmap *netmapSDK.NetMap, requiredPl
 			if err != nil {
 				resultMtx.Lock()
 				defer resultMtx.Unlock()
-				result[cand.Hash()] = boolError{err: err}
+				result.errors = append(result.errors, fmt.Errorf("failed to connect to node %s: %w", hex.EncodeToString(cand.PublicKey()), err))
 				return nil
 			}
 
+			for _, object := range objects {
+				object := object
 				eg.Go(func() error {
-				var v boolError
+					stored, err := isObjectStoredOnNode(egCtx, cmd, object.containerID, object.objectID, cli, pk)
-				v.value, v.err = isObjectStoredOnNode(egCtx, cmd, objInfo.containerID, objInfo.objectID, cli, pk)
 					resultMtx.Lock()
 					defer resultMtx.Unlock()
-				if prev, exists := result[cand.Hash()]; exists && (prev.err != nil || prev.value) {
+					if err == nil && stored {
-					return nil
+						op := result.placements[object.objectID]
+						op.confirmedNodes = append(op.confirmedNodes, cand)
+						result.placements[object.objectID] = op
 					}
-				result[cand.Hash()] = v
+					if err != nil {
-				return nil
+						result.errors = append(result.errors, fmt.Errorf("failed to check object %s existence on node %s: %w", object.objectID.EncodeToString(), hex.EncodeToString(cand.PublicKey()), err))
-			})
-
-			for _, rObjID := range objInfo.relatedObjectIDs {
-				rObjID := rObjID
-				eg.Go(func() error {
-					var v boolError
-					v.value, v.err = isObjectStoredOnNode(egCtx, cmd, objInfo.containerID, rObjID, cli, pk)
-					resultMtx.Lock()
-					defer resultMtx.Unlock()
-					if prev, exists := result[cand.Hash()]; exists && (prev.err != nil || prev.value) {
-						return nil
 					}
-					result[cand.Hash()] = v
 					return nil
 				})
 			}
@@ -274,7 +387,24 @@ func getActualPlacement(cmd *cobra.Command, netmap *netmapSDK.NetMap, requiredPl
 	}
 
 	commonCmd.ExitOnErr(cmd, "failed to get actual placement: %w", eg.Wait())
-	return result
+}
+
+func getNodesToCheckObjectExistance(cmd *cobra.Command, netmap *netmapSDK.NetMap, result *objectNodesResult) []netmapSDK.NodeInfo {
+	checkAllNodes, _ := cmd.Flags().GetBool(verifyPresenceAllFlag)
+	if checkAllNodes {
+		return netmap.Nodes()
+	}
+	var nodes []netmapSDK.NodeInfo
+	visited := make(map[uint64]struct{})
+	for _, p := range result.placements {
+		for _, node := range p.requiredNodes {
+			if _, ok := visited[node.Hash()]; !ok {
+				nodes = append(nodes, node)
+				visited[node.Hash()] = struct{}{}
+			}
+		}
+	}
+	return nodes
 }
 
 func createClient(ctx context.Context, cmd *cobra.Command, candidate netmapSDK.NodeInfo, pk *ecdsa.PrivateKey) (*client.Client, error) {
@@ -328,27 +458,113 @@ func isObjectStoredOnNode(ctx context.Context, cmd *cobra.Command, cnrID cid.ID,
 	if errors.As(err, &notFound) || errors.As(err, &removed) {
 		return false, nil
 	}
+	cmd.Printf("failed to get object %s from client\n", objID.EncodeToString())
 	return false, err
 }
 
-func printPlacement(cmd *cobra.Command, netmap *netmapSDK.NetMap, requiredPlacement map[uint64]netmapSDK.NodeInfo, actualPlacement map[uint64]boolError) {
+func printPlacement(cmd *cobra.Command, objID oid.ID, objects []phyObject, result *objectNodesResult) {
-	w := tabwriter.NewWriter(cmd.OutOrStdout(), 0, 0, 1, ' ', tabwriter.AlignRight|tabwriter.Debug)
+	normilizeObjectNodesResult(objects, result)
-	defer func() {
+	if json, _ := cmd.Flags().GetBool(commonflags.JSON); json {
-		commonCmd.ExitOnErr(cmd, "failed to print placement info: %w", w.Flush())
+		printObjectNodesAsJSON(cmd, objID, objects, result)
-	}()
-	fmt.Fprintln(w, "Node ID\tShould contain object\tActually contains object\t")
-	for _, n := range netmap.Nodes() {
-		nodeID := hex.EncodeToString(n.PublicKey())
-		_, required := requiredPlacement[n.Hash()]
-		actual, actualExists := actualPlacement[n.Hash()]
-		actualStr := ""
-		if actualExists {
-			if actual.err != nil {
-				actualStr = fmt.Sprintf("error: %v", actual.err)
 	} else {
-				actualStr = strconv.FormatBool(actual.value)
+		printObjectNodesAsText(cmd, objID, objects, result)
-			}
-		}
-		fmt.Fprintf(w, "%s\t%s\t%s\t\n", nodeID, strconv.FormatBool(required), actualStr)
 	}
 }
+
+func normilizeObjectNodesResult(objects []phyObject, result *objectNodesResult) {
+	slices.SortFunc(objects, func(lhs, rhs phyObject) int {
+		if lhs.ecHeader == nil && rhs.ecHeader == nil {
+			return bytes.Compare(lhs.objectID[:], rhs.objectID[:])
+		}
+		if lhs.ecHeader == nil {
+			return -1
+		}
+		if rhs.ecHeader == nil {
+			return 1
+		}
+		if lhs.ecHeader.parent == rhs.ecHeader.parent {
+			return cmp.Compare(lhs.ecHeader.index, rhs.ecHeader.index)
+		}
+		return bytes.Compare(lhs.ecHeader.parent[:], rhs.ecHeader.parent[:])
+	})
+	for _, obj := range objects {
+		op := result.placements[obj.objectID]
+		slices.SortFunc(op.confirmedNodes, func(lhs, rhs netmapSDK.NodeInfo) int {
+			return bytes.Compare(lhs.PublicKey(), rhs.PublicKey())
+		})
+		slices.SortFunc(op.requiredNodes, func(lhs, rhs netmapSDK.NodeInfo) int {
+			return bytes.Compare(lhs.PublicKey(), rhs.PublicKey())
+		})
+		result.placements[obj.objectID] = op
+	}
+}
+
+func printObjectNodesAsText(cmd *cobra.Command, objID oid.ID, objects []phyObject, result *objectNodesResult) {
+	fmt.Fprintf(cmd.OutOrStdout(), "Object %s stores payload in %d data objects:\n", objID.EncodeToString(), len(objects))
+
+	for _, object := range objects {
+		fmt.Fprintf(cmd.OutOrStdout(), "- %s\n", object.objectID)
+		if object.ecHeader != nil {
+			fmt.Fprintf(cmd.OutOrStdout(), "\tEC index: %d\n", object.ecHeader.index)
+			fmt.Fprintf(cmd.OutOrStdout(), "\tEC parent: %s\n", object.ecHeader.parent.EncodeToString())
+		}
+		op, ok := result.placements[object.objectID]
+		if !ok {
+			continue
+		}
+		if len(op.requiredNodes) > 0 {
+			fmt.Fprintf(cmd.OutOrStdout(), "\tRequired nodes:\n")
+			for _, node := range op.requiredNodes {
+				fmt.Fprintf(cmd.OutOrStdout(), "\t\t- %s\n", hex.EncodeToString(node.PublicKey()))
+			}
+		}
+		if len(op.confirmedNodes) > 0 {
+			fmt.Fprintf(cmd.OutOrStdout(), "\tConfirmed nodes:\n")
+			for _, node := range op.confirmedNodes {
+				fmt.Fprintf(cmd.OutOrStdout(), "\t\t- %s\n", hex.EncodeToString(node.PublicKey()))
+			}
+		}
+	}
+
+	if len(result.errors) == 0 {
+		return
+	}
+	fmt.Fprintf(cmd.OutOrStdout(), "Errors:\n")
+	for _, err := range result.errors {
+		fmt.Fprintf(cmd.OutOrStdout(), "\t%s\n", err.Error())
+	}
+}
+
+func printObjectNodesAsJSON(cmd *cobra.Command, objID oid.ID, objects []phyObject, result *objectNodesResult) {
+	jsonResult := &objNodesResultJSON{
+		ObjectID: objID.EncodeToString(),
+	}
+
+	for _, object := range objects {
+		do := ObjNodesDataObject{
+			ObjectID: object.objectID.EncodeToString(),
+		}
+		if object.ecHeader != nil {
+			do.ECIndex = &object.ecHeader.index
+			ecParent := object.ecHeader.parent.EncodeToString()
+			do.ECParentObjectID = &ecParent
+		}
+		op, ok := result.placements[object.objectID]
+		if !ok {
+			continue
+		}
+		for _, rn := range op.requiredNodes {
+			do.RequiredNodes = append(do.RequiredNodes, hex.EncodeToString(rn.PublicKey()))
+		}
+		for _, cn := range op.confirmedNodes {
+			do.ConfirmedNodes = append(do.ConfirmedNodes, hex.EncodeToString(cn.PublicKey()))
+		}
+		jsonResult.DataObjects = append(jsonResult.DataObjects, do)
+	}
+	for _, err := range result.errors {
+		jsonResult.Errors = append(jsonResult.Errors, err.Error())
+	}
+	b, err := json.Marshal(jsonResult)
+	commonCmd.ExitOnErr(cmd, "failed to marshal json: %w", err)
+	cmd.Println(string(b))
+}

cmd/frostfs-cli/modules/object/util.go

@@ -370,7 +370,7 @@ func collectObjectRelatives(cmd *cobra.Command, cli *client.Client, cnr cid.ID,
 
 	splitInfo := errSplit.SplitInfo()
 
-	if members, ok := tryGetSplitMembersByLinkingObject(cmd, splitInfo, prmHead, cnr); ok {
+	if members, ok := tryGetSplitMembersByLinkingObject(cmd, splitInfo, prmHead, cnr, true); ok {
 		return members
 	}
 
@@ -381,7 +381,7 @@ func collectObjectRelatives(cmd *cobra.Command, cli *client.Client, cnr cid.ID,
 	return tryRestoreChainInReverse(cmd, splitInfo, prmHead, cli, cnr, obj)
 }
 
-func tryGetSplitMembersByLinkingObject(cmd *cobra.Command, splitInfo *objectSDK.SplitInfo, prmHead internal.HeadObjectPrm, cnr cid.ID) ([]oid.ID, bool) {
+func tryGetSplitMembersByLinkingObject(cmd *cobra.Command, splitInfo *objectSDK.SplitInfo, prmHead internal.HeadObjectPrm, cnr cid.ID, withLinking bool) ([]oid.ID, bool) {
 	// collect split chain by the descending ease of operations (ease is evaluated heuristically).
 	// If any approach fails, we don't try the next since we assume that it will fail too.
 
@@ -402,9 +402,11 @@ func tryGetSplitMembersByLinkingObject(cmd *cobra.Command, splitInfo *objectSDK.
 
 			common.PrintVerbose(cmd, "Received split members from the linking object: %v", children)
 
-			// include linking object
+			if withLinking {
 				return append(children, idLinking), true
 			}
+			return children, true
+		}
 
 		// linking object is not required for
 		// object collecting

pkg/services/object/put/ec.go

@@ -147,7 +147,7 @@ func (e *ecWriter) relayToContainerNode(ctx context.Context) error {
 }
 
 func (e *ecWriter) writeECPart(ctx context.Context, obj *objectSDK.Object) error {
-	t, err := placement.NewTraverser(e.placementOpts...)
+	t, err := placement.NewTraverser(append(e.placementOpts, placement.ForObject(obj.ECHeader().Parent()))...)
 	if err != nil {
 		return err
 	}
@@ -162,6 +162,7 @@ func (e *ecWriter) writeECPart(ctx context.Context, obj *objectSDK.Object) error
 		eg.Go(func() error {
 			return e.writePart(egCtx, obj, int(obj.ECHeader().Index()), nodes)
 		})
+		t.SubmitSuccess()
 	}
 	if err := eg.Wait(); err != nil {
 		return errIncompletePut{
@@ -181,7 +182,8 @@ func (e *ecWriter) writeRawObject(ctx context.Context, obj *objectSDK.Object) er
 	if err != nil {
 		return err
 	}
-	t, err := placement.NewTraverser(e.placementOpts...)
+	objID, _ := obj.ID()
+	t, err := placement.NewTraverser(append(e.placementOpts, placement.ForObject(objID))...)
 	if err != nil {
 		return err
 	}
@@ -198,6 +200,7 @@ func (e *ecWriter) writeRawObject(ctx context.Context, obj *objectSDK.Object) er
 			eg.Go(func() error {
 				return e.writePart(egCtx, parts[idx], idx, nodes)
 			})
+			t.SubmitSuccess()
 		}
 	}
 	if err := eg.Wait(); err != nil {