[#1253] getSvc: Fix EC objects get

Now EC objects assembling is performed concurrently.
Also fixed issue with an error in case of getting
EC object via non-container node.

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

internal/logs/logs.go

@@ -108,6 +108,7 @@ const (
 	GetUnableToGetPartECObject                                           = "unable to get part of the erasure-encoded object"
 	GetUnableToHeadPartECObject                                          = "unable to head part of the erasure-encoded object"
 	GetUnableToGetECObjectContainer                                      = "unable to get container for erasure-coded object"
+	GetUnableToHeadPartsECObject                                         = "unable to head parts of the erasure-encoded object"
 	GetAssemblingSplittedObjectCompleted                                 = "assembling splitted object completed"
 	GetAssemblingECObjectCompleted                                       = "assembling erasure-coded object completed"
 	GetFailedToAssembleSplittedObject                                    = "failed to assemble splitted object"
@@ -123,6 +124,7 @@ const (
 	GetRequestedObjectIsVirtual                                          = "requested object is virtual"
 	GetRequestedObjectIsEC                                               = "requested object is erasure-coded"
 	GetRequestedRangeIsOutOfObjectBounds                                 = "requested range is out of object bounds"
+	GetUnexpectedECObject                                                = "failed to get EC object from node: expected EC info, but got full object"
 	PutAdditionalContainerBroadcastFailure                               = "additional container broadcast failure"
 	SearchReturnResultDirectly                                           = "return result directly"
 	SearchCouldNotConstructRemoteNodeClient                              = "could not construct remote node client"

pkg/services/object/get/assemble.go

@@ -140,7 +140,7 @@ func (r *request) getObjectWithIndependentRequest(ctx context.Context, prm Reque
 
 		prm:       prm,
 		infoSplit: objectSDK.NewSplitInfo(),
-		infoEC:    objectSDK.NewECInfo(),
+		infoEC:    newECInfo(),
 		log:       r.log,
 	}
 

pkg/services/object/get/assembleec.go

@@ -6,11 +6,12 @@ import (
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
 	apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
+	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
 	"go.uber.org/zap"
 )
 
 func (r *request) assembleEC(ctx context.Context) {
-	if r.isRaw() {
+	if r.isRaw() && r.isLocal() {
 		r.log.Debug(logs.GetCanNotAssembleTheObject)
 		return
 	}
@@ -35,8 +36,14 @@ func (r *request) assembleEC(ctx context.Context) {
 
 	r.log.Debug(logs.GetTryingToAssembleTheECObject)
 
+	// initialize epoch number
+	ok := r.initEpoch()
+	if !ok {
+		return
+	}
+
 	r.prm.common = r.prm.common.WithLocalOnly(false)
-	assembler := newAssemblerEC(r.address(), r.infoEC, r.ctxRange(), r, r.containerSource, r.log)
+	assembler := newAssemblerEC(r.address(), r.infoEC, r.ctxRange(), r, r.localStorage, r.containerSource, r.log, r.headOnly(), r.isRaw(), r.traverserGenerator, r.curProcEpoch)
 
 	r.log.Debug(logs.GetAssemblingECObject,
 		zap.Uint64("range_offset", r.ctxRange().GetOffset()),
@@ -47,8 +54,8 @@ func (r *request) assembleEC(ctx context.Context) {
 		zap.Uint64("range_length", r.ctxRange().GetLength()),
 	)
 
-	obj, err := assembler.Assemble(ctx, r.prm.objWriter, r.headOnly())
+	obj, err := assembler.Assemble(ctx, r.prm.objWriter)
-	if err != nil {
+	if err != nil && !errors.As(err, new(*objectSDK.ECInfoError)) {
 		r.log.Warn(logs.GetFailedToAssembleECObject,
 			zap.Error(err),
 			zap.Uint64("range_offset", r.ctxRange().GetOffset()),
@@ -58,6 +65,7 @@ func (r *request) assembleEC(ctx context.Context) {
 
 	var errRemoved *apistatus.ObjectAlreadyRemoved
 	var errOutOfRange *apistatus.ObjectOutOfRange
+	var errECInfo *objectSDK.ECInfoError
 
 	switch {
 	default:
@@ -73,5 +81,8 @@ func (r *request) assembleEC(ctx context.Context) {
 	case errors.As(err, &errOutOfRange):
 		r.status = statusOutOfRange
 		r.err = errOutOfRange
+	case errors.As(err, &errECInfo):
+		r.status = statusEC
+		r.err = err
 	}
 }

pkg/services/object/get/assemblerec.go

@@ -2,11 +2,16 @@ package getsvc
 
 import (
 	"context"
+	"encoding/hex"
+	"errors"
 	"fmt"
+	"sync"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/client"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/container"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/policy"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object_manager/placement"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/logger"
 	apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
 	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
@@ -16,61 +21,79 @@ import (
 	"golang.org/x/sync/errgroup"
 )
 
+var errECPartsRetrieveCompleted = errors.New("EC parts receive completed")
+
+type ecRemoteStorage interface {
+	getObjectFromNode(ctx context.Context, addr oid.Address, info client.NodeInfo) (*objectSDK.Object, error)
+	headObjectFromNode(ctx context.Context, addr oid.Address, info client.NodeInfo, raw bool) (*objectSDK.Object, error)
+}
+
 type assemblerec struct {
-	addr      oid.Address
+	addr               oid.Address
-	ecInfo    *objectSDK.ECInfo
+	ecInfo             *ecInfo
-	rng       *objectSDK.Range
+	rng                *objectSDK.Range
-	objGetter objectGetter
+	remoteStorage      ecRemoteStorage
-	cs        container.Source
+	localStorage       localStorage
-	log       *logger.Logger
+	cs                 container.Source
+	log                *logger.Logger
+	head               bool
+	raw                bool
+	traverserGenerator traverserGenerator
+	epoch              uint64
 }
 
 func newAssemblerEC(
 	addr oid.Address,
-	ecInfo *objectSDK.ECInfo,
+	ecInfo *ecInfo,
 	rng *objectSDK.Range,
-	objGetter objectGetter,
+	remoteStorage ecRemoteStorage,
+	localStorage localStorage,
 	cs container.Source,
 	log *logger.Logger,
+	head bool,
+	raw bool,
+	tg traverserGenerator,
+	epoch uint64,
 ) *assemblerec {
 	return &assemblerec{
-		addr:      addr,
+		addr:               addr,
-		rng:       rng,
+		rng:                rng,
-		ecInfo:    ecInfo,
+		ecInfo:             ecInfo,
-		objGetter: objGetter,
+		remoteStorage:      remoteStorage,
-		cs:        cs,
+		localStorage:       localStorage,
-		log:       log,
+		cs:                 cs,
+		log:                log,
+		head:               head,
+		raw:                raw,
+		traverserGenerator: tg,
+		epoch:              epoch,
 	}
 }
 
 // Assemble assembles erasure-coded object and writes it's content to ObjectWriter.
 // It returns parent object.
-func (a *assemblerec) Assemble(ctx context.Context, writer ObjectWriter, headOnly bool) (*objectSDK.Object, error) {
+func (a *assemblerec) Assemble(ctx context.Context, writer ObjectWriter) (*objectSDK.Object, error) {
-	if headOnly {
+	switch {
+	case a.raw:
+		err := a.reconstructRawError(ctx)
+		return nil, err
+	case a.head:
 		return a.reconstructHeader(ctx, writer)
-	} else if a.rng != nil {
+	case a.rng != nil:
 		return a.reconstructRange(ctx, writer)
+	default:
+		return a.reconstructObject(ctx, writer)
 	}
-	return a.reconstructObject(ctx, writer)
 }
 
-func (a *assemblerec) getConstructor() (*erasurecode.Constructor, error) {
+func (a *assemblerec) getConstructor(cnr *container.Container) (*erasurecode.Constructor, error) {
-	cnt, err := a.cs.Get(a.addr.Container())
+	dataCount := policy.ECDataCount(cnr.Value.PlacementPolicy())
-	if err != nil {
+	parityCount := policy.ECParityCount(cnr.Value.PlacementPolicy())
-		return nil, err
-	}
-	dataCount := policy.ECDataCount(cnt.Value.PlacementPolicy())
-	parityCount := policy.ECParityCount(cnt.Value.PlacementPolicy())
 	return erasurecode.NewConstructor(dataCount, parityCount)
 }
 
 func (a *assemblerec) reconstructHeader(ctx context.Context, writer ObjectWriter) (*objectSDK.Object, error) {
-	parts := a.retrieveParts(ctx, true)
+	obj, err := a.reconstructObjectFromParts(ctx, true)
-	c, err := a.getConstructor()
-	if err != nil {
-		return nil, err
-	}
-	obj, err := c.ReconstructHeader(parts)
 	if err == nil {
 		return obj, writer.WriteHeader(ctx, obj)
 	}
@@ -78,12 +101,7 @@ func (a *assemblerec) reconstructHeader(ctx context.Context, writer ObjectWriter
 }
 
 func (a *assemblerec) reconstructRange(ctx context.Context, writer ObjectWriter) (*objectSDK.Object, error) {
-	parts := a.retrieveParts(ctx, false)
+	obj, err := a.reconstructObjectFromParts(ctx, false)
-	c, err := a.getConstructor()
-	if err != nil {
-		return nil, err
-	}
-	obj, err := c.Reconstruct(parts)
 	if err != nil {
 		return nil, err
 	}
@@ -101,12 +119,7 @@ func (a *assemblerec) reconstructRange(ctx context.Context, writer ObjectWriter)
 }
 
 func (a *assemblerec) reconstructObject(ctx context.Context, writer ObjectWriter) (*objectSDK.Object, error) {
-	parts := a.retrieveParts(ctx, false)
+	obj, err := a.reconstructObjectFromParts(ctx, false)
-	c, err := a.getConstructor()
-	if err != nil {
-		return nil, err
-	}
-	obj, err := c.Reconstruct(parts)
 	if err == nil {
 		err = writer.WriteHeader(ctx, obj.CutPayload())
 		if err == nil {
@@ -119,41 +132,238 @@ func (a *assemblerec) reconstructObject(ctx context.Context, writer ObjectWriter
 	return obj, err
 }
 
-func (a *assemblerec) retrieveParts(mainCtx context.Context, headOnly bool) []*objectSDK.Object {
+func (a *assemblerec) reconstructObjectFromParts(ctx context.Context, headers bool) (*objectSDK.Object, error) {
-	parts := make([]*objectSDK.Object, int(a.ecInfo.Chunks[0].Total))
+	objID := a.addr.Object()
-	errGroup, ctx := errgroup.WithContext(mainCtx)
+	trav, cnr, err := a.traverserGenerator.GenerateTraverser(a.addr.Container(), &objID, a.epoch)
+	if err != nil {
+		return nil, err
+	}
+	c, err := a.getConstructor(cnr)
+	if err != nil {
+		return nil, err
+	}
+	parts := a.retrieveParts(ctx, trav, cnr)
+	if headers {
+		return c.ReconstructHeader(parts)
+	}
+	return c.Reconstruct(parts)
+}
 
-	for i := range a.ecInfo.Chunks {
+func (a *assemblerec) reconstructRawError(ctx context.Context) error {
-		chunk := a.ecInfo.Chunks[i]
+	chunks := make(map[string]objectSDK.ECChunk)
-		errGroup.Go(func() error {
+	var chunksGuard sync.Mutex
-			objID := new(oid.ID)
+	for _, ch := range a.ecInfo.localChunks {
-			err := objID.ReadFromV2(chunk.ID)
+		chunks[string(ch.ID.GetValue())] = ch
-			if err != nil {
-				return fmt.Errorf("invalid object ID: %w", err)
-			}
-			var obj *objectSDK.Object
-			if headOnly {
-				obj, err = a.objGetter.HeadObject(ctx, *objID)
-				if err != nil {
-					a.log.Debug(logs.GetUnableToHeadPartECObject, zap.Stringer("part_id", objID), zap.Error(err))
-					return nil
-				}
-			} else {
-				sow := NewSimpleObjectWriter()
-				obj, err = a.objGetter.GetObjectAndWritePayload(ctx, *objID, nil, sow)
-				if err != nil {
-					a.log.Debug(logs.GetUnableToGetPartECObject, zap.Stringer("part_id", objID), zap.Error(err))
-					return nil
-				}
-				obj.SetPayload(sow.pld)
-			}
-			parts[chunk.Index] = obj
-			return nil
-		})
 	}
 
-	if err := errGroup.Wait(); err != nil {
+	objID := a.addr.Object()
+	trav, _, err := a.traverserGenerator.GenerateTraverser(a.addr.Container(), &objID, a.epoch)
+	if err != nil {
+		return err
+	}
+
+	eg, ctx := errgroup.WithContext(ctx)
+	for {
+		batch := trav.Next()
+		if len(batch) == 0 {
+			break
+		}
+		for _, node := range batch {
+			var info client.NodeInfo
+			client.NodeInfoFromNetmapElement(&info, node)
+			eg.Go(func() error {
+				select {
+				case <-ctx.Done():
+					return ctx.Err()
+				default:
+				}
+
+				if _, found := a.ecInfo.remoteChunks[string(info.PublicKey())]; found {
+					return nil
+				}
+
+				nodeChunks := a.tryGetChunkListFromNode(ctx, info)
+
+				chunksGuard.Lock()
+				defer chunksGuard.Unlock()
+				for _, ch := range nodeChunks {
+					chunks[string(ch.ID.GetValue())] = ch
+				}
+				return nil
+			})
+		}
+	}
+	if err = eg.Wait(); err != nil {
+		return err
+	}
+	return createECInfoErr(chunks)
+}
+
+func (a *assemblerec) retrieveParts(ctx context.Context, trav *placement.Traverser, cnr *container.Container) []*objectSDK.Object {
+	dataCount := policy.ECDataCount(cnr.Value.PlacementPolicy())
+	parityCount := policy.ECParityCount(cnr.Value.PlacementPolicy())
+
+	remoteNodes := make([]placement.Node, 0)
+	for {
+		batch := trav.Next()
+		if len(batch) == 0 {
+			break
+		}
+		remoteNodes = append(remoteNodes, batch...)
+	}
+
+	parts, err := a.processECNodesRequests(ctx, remoteNodes, dataCount, parityCount)
+	if err != nil {
 		a.log.Debug(logs.GetUnableToGetAllPartsECObject, zap.Error(err))
 	}
 	return parts
 }
+
+func (a *assemblerec) processECNodesRequests(ctx context.Context, nodes []placement.Node, dataCount, parityCount int) ([]*objectSDK.Object, error) {
+	foundChunks := make(map[uint32]*objectSDK.Object)
+	var foundChunksGuard sync.Mutex
+	eg, ctx := errgroup.WithContext(ctx)
+	eg.SetLimit(dataCount)
+
+	for _, ch := range a.ecInfo.localChunks {
+		ch := ch
+		eg.Go(func() error {
+			select {
+			case <-ctx.Done():
+				return ctx.Err()
+			default:
+			}
+			object := a.tryGetChunkFromLocalStorage(ctx, ch)
+			if object == nil {
+				return nil
+			}
+			foundChunksGuard.Lock()
+			foundChunks[ch.Index] = object
+			count := len(foundChunks)
+			foundChunksGuard.Unlock()
+			if count >= dataCount {
+				return errECPartsRetrieveCompleted
+			}
+			return nil
+		})
+	}
+
+	for _, node := range nodes {
+		var info client.NodeInfo
+		client.NodeInfoFromNetmapElement(&info, node)
+		eg.Go(func() error {
+			select {
+			case <-ctx.Done():
+				return ctx.Err()
+			default:
+			}
+			chunks := a.tryGetChunkListFromNode(ctx, info)
+			for _, ch := range chunks {
+				object := a.tryGetChunkFromRemoteStorage(ctx, info, ch)
+				if object == nil {
+					continue
+				}
+				foundChunksGuard.Lock()
+				foundChunks[ch.Index] = object
+				count := len(foundChunks)
+				foundChunksGuard.Unlock()
+				if count >= dataCount {
+					return errECPartsRetrieveCompleted
+				}
+			}
+			return nil
+		})
+	}
+	err := eg.Wait()
+	if err == nil || errors.Is(err, errECPartsRetrieveCompleted) {
+		parts := make([]*objectSDK.Object, dataCount+parityCount)
+		for idx, chunk := range foundChunks {
+			parts[idx] = chunk
+		}
+		return parts, nil
+	}
+	return nil, err
+}
+
+func (a *assemblerec) tryGetChunkFromLocalStorage(ctx context.Context, ch objectSDK.ECChunk) *objectSDK.Object {
+	var objID oid.ID
+	err := objID.ReadFromV2(ch.ID)
+	if err != nil {
+		a.log.Error(logs.GetUnableToHeadPartECObject, zap.String("node", "local"), zap.Uint32("part_index", ch.Index), zap.Error(fmt.Errorf("invalid object ID: %w", err)))
+		return nil
+	}
+	var addr oid.Address
+	addr.SetContainer(addr.Container())
+	addr.SetObject(objID)
+	var object *objectSDK.Object
+	if a.head {
+		object, err = a.localStorage.Head(ctx, addr, false)
+		if err != nil {
+			a.log.Warn(logs.GetUnableToHeadPartECObject, zap.String("node", "local"), zap.Stringer("part_id", objID), zap.Error(err))
+			return nil
+		}
+	} else {
+		object, err = a.localStorage.Get(ctx, addr)
+		if err != nil {
+			a.log.Warn(logs.GetUnableToGetPartECObject, zap.String("node", "local"), zap.Stringer("part_id", objID), zap.Error(err))
+			return nil
+		}
+	}
+	return object
+}
+
+func (a *assemblerec) tryGetChunkListFromNode(ctx context.Context, node client.NodeInfo) []objectSDK.ECChunk {
+	if chunks, found := a.ecInfo.remoteChunks[string(node.PublicKey())]; found {
+		return chunks
+	}
+	var errECInfo *objectSDK.ECInfoError
+	_, err := a.remoteStorage.headObjectFromNode(ctx, a.addr, node, true)
+	if err == nil {
+		a.log.Error(logs.GetUnexpectedECObject, zap.String("node", hex.EncodeToString(node.PublicKey())))
+		return nil
+	}
+	if !errors.As(err, &errECInfo) {
+		a.log.Warn(logs.GetUnableToHeadPartsECObject, zap.String("node", hex.EncodeToString(node.PublicKey())), zap.Error(err))
+		return nil
+	}
+	result := make([]objectSDK.ECChunk, 0, len(errECInfo.ECInfo().Chunks))
+	for _, ch := range errECInfo.ECInfo().Chunks {
+		result = append(result, objectSDK.ECChunk(ch))
+	}
+	return result
+}
+
+func (a *assemblerec) tryGetChunkFromRemoteStorage(ctx context.Context, node client.NodeInfo, ch objectSDK.ECChunk) *objectSDK.Object {
+	var objID oid.ID
+	err := objID.ReadFromV2(ch.ID)
+	if err != nil {
+		a.log.Error(logs.GetUnableToHeadPartECObject, zap.String("node", hex.EncodeToString(node.PublicKey())), zap.Uint32("part_index", ch.Index), zap.Error(fmt.Errorf("invalid object ID: %w", err)))
+		return nil
+	}
+	var addr oid.Address
+	addr.SetContainer(a.addr.Container())
+	addr.SetObject(objID)
+	var object *objectSDK.Object
+	if a.head {
+		object, err = a.remoteStorage.headObjectFromNode(ctx, addr, node, false)
+		if err != nil {
+			a.log.Warn(logs.GetUnableToHeadPartECObject, zap.String("node", hex.EncodeToString(node.PublicKey())), zap.Stringer("part_id", objID), zap.Error(err))
+			return nil
+		}
+	} else {
+		object, err = a.remoteStorage.getObjectFromNode(ctx, addr, node)
+		if err != nil {
+			a.log.Warn(logs.GetUnableToGetPartECObject, zap.String("node", hex.EncodeToString(node.PublicKey())), zap.Stringer("part_id", objID), zap.Error(err))
+			return nil
+		}
+	}
+	return object
+}
+
+func createECInfoErr(chunks map[string]objectSDK.ECChunk) *objectSDK.ECInfoError {
+	info := objectSDK.NewECInfo()
+	for _, ch := range chunks {
+		info.AddChunk(ch)
+	}
+	return objectSDK.NewECInfoError(info)
+}

pkg/services/object/get/get.go

@@ -77,7 +77,7 @@ func (s *Service) get(ctx context.Context, prm RequestParameters) error {
 
 		prm:       prm,
 		infoSplit: objectSDK.NewSplitInfo(),
-		infoEC:    objectSDK.NewECInfo(),
+		infoEC:    newECInfo(),
 		log:       s.log,
 	}
 
@@ -110,15 +110,8 @@ func (exec *request) analyzeStatus(ctx context.Context, execCnr bool) {
 	case statusOutOfRange:
 		exec.log.Debug(logs.GetRequestedRangeIsOutOfObjectBounds)
 	case statusEC:
-		if !exec.isLocal() {
+		exec.log.Debug(logs.GetRequestedObjectIsEC)
-			if execCnr {
+		exec.assembleEC(ctx)
-				exec.executeOnContainer(ctx)
-				exec.analyzeStatus(ctx, false)
-			} else {
-				exec.log.Debug(logs.GetRequestedObjectIsEC)
-				exec.assembleEC(ctx)
-			}
-		}
 	default:
 		exec.log.Debug(logs.OperationFinishedWithError,
 			zap.Error(exec.err),

pkg/services/object/get/get_test.go

@@ -11,6 +11,7 @@ import (
 	"testing"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/client"
+	containerCore "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/container"
 	netmapcore "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/netmap"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/object"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/network"
@@ -78,7 +79,7 @@ func newTestStorage() *testStorage {
 	}
 }
 
-func (g *testTraverserGenerator) GenerateTraverser(cnr cid.ID, obj *oid.ID, e uint64) (*placement.Traverser, error) {
+func (g *testTraverserGenerator) GenerateTraverser(cnr cid.ID, obj *oid.ID, e uint64) (*placement.Traverser, *containerCore.Container, error) {
 	opts := make([]placement.Option, 0, 4)
 	opts = append(opts,
 		placement.ForContainer(g.c),
@@ -90,7 +91,10 @@ func (g *testTraverserGenerator) GenerateTraverser(cnr cid.ID, obj *oid.ID, e ui
 		opts = append(opts, placement.ForObject(*obj))
 	}
 
-	return placement.NewTraverser(opts...)
+	t, err := placement.NewTraverser(opts...)
+	return t, &containerCore.Container{
+		Value: g.c,
+	}, err
 }
 
 func (p *testPlacementBuilder) BuildPlacement(cnr cid.ID, obj *oid.ID, _ netmap.PlacementPolicy) ([][]netmap.NodeInfo, error) {
@@ -474,6 +478,7 @@ func testNodeMatrix(t testing.TB, dim []int) ([][]netmap.NodeInfo, [][]string) {
 
 			var ni netmap.NodeInfo
 			ni.SetNetworkEndpoints(a)
+			ni.SetPublicKey([]byte(a))
 
 			var na network.AddressGroup
 

pkg/services/object/get/local.go

@@ -5,7 +5,6 @@ import (
 	"errors"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
-	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/util"
 	"git.frostfs.info/TrueCloudLab/frostfs-observability/tracing"
 	apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
 	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
@@ -46,8 +45,7 @@ func (r *request) executeLocal(ctx context.Context) {
 		r.err = objectSDK.NewSplitInfoError(r.infoSplit)
 	case errors.As(err, &errECInfo):
 		r.status = statusEC
-		util.MergeECInfo(errECInfo.ECInfo(), r.infoEC)
+		r.err = r.infoEC.addLocal(errECInfo.ECInfo())
-		r.err = objectSDK.NewECInfoError(r.infoEC)
 	case errors.As(err, &errOutOfRange):
 		r.status = statusOutOfRange
 		r.err = errOutOfRange

pkg/services/object/get/remote.go

@@ -7,11 +7,10 @@ import (
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/client"
-	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/policy"
-	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/util"
 	"git.frostfs.info/TrueCloudLab/frostfs-observability/tracing"
 	apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
 	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
+	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	"go.uber.org/zap"
 )
 
@@ -36,11 +35,6 @@ func (r *request) processNode(ctx context.Context, info client.NodeInfo) bool {
 	switch {
 	default:
 		r.log.Debug(logs.GetRemoteCallFailed, zap.Error(err))
-		if r.status == statusEC {
-			// we need to continue getting another chunks  from another nodes
-			// in case of network issue
-			return false
-		}
 		r.status = statusUndefined
 		r.err = new(apistatus.ObjectNotFound)
 	case err == nil:
@@ -66,18 +60,7 @@ func (r *request) processNode(ctx context.Context, info client.NodeInfo) bool {
 		r.err = objectSDK.NewSplitInfoError(r.infoSplit)
 	case errors.As(err, &errECInfo):
 		r.status = statusEC
-		util.MergeECInfo(r.infoEC, errECInfo.ECInfo())
+		r.err = r.infoEC.addRemote(string(info.PublicKey()), errECInfo.ECInfo())
-		r.infoEC = errECInfo.ECInfo()
-		r.err = objectSDK.NewECInfoError(r.infoEC)
-		if r.isRaw() {
-			return len(r.infoEC.Chunks) == int(r.infoEC.Chunks[0].Total)
-		}
-		cnt, err := r.containerSource.Get(r.address().Container())
-		if err == nil {
-			return len(r.infoEC.Chunks) == policy.ECDataCount(cnt.Value.PlacementPolicy())
-		}
-		r.log.Debug(logs.GetUnableToGetECObjectContainer, zap.Error(err))
-		return len(r.infoEC.Chunks) == int(r.infoEC.Chunks[0].Total)
 	}
 
 	return r.status != statusUndefined
@@ -116,3 +99,50 @@ func (r *request) getRemote(ctx context.Context, rs remoteStorage, info client.N
 
 	return rs.Get(ctx, r.address(), prm)
 }
+
+func (r *request) getObjectFromNode(ctx context.Context, addr oid.Address, info client.NodeInfo) (*objectSDK.Object, error) {
+	rs, err := r.remoteStorageConstructor.Get(info)
+	if err != nil {
+		return nil, err
+	}
+
+	key, err := r.key()
+	if err != nil {
+		return nil, err
+	}
+
+	prm := RemoteRequestParams{
+		Epoch:        r.curProcEpoch,
+		TTL:          1,
+		PrivateKey:   key,
+		SessionToken: r.prm.common.SessionToken(),
+		BearerToken:  r.prm.common.BearerToken(),
+		XHeaders:     r.prm.common.XHeaders(),
+	}
+
+	return rs.Get(ctx, addr, prm)
+}
+
+func (r *request) headObjectFromNode(ctx context.Context, addr oid.Address, info client.NodeInfo, raw bool) (*objectSDK.Object, error) {
+	rs, err := r.remoteStorageConstructor.Get(info)
+	if err != nil {
+		return nil, err
+	}
+
+	key, err := r.key()
+	if err != nil {
+		return nil, err
+	}
+
+	prm := RemoteRequestParams{
+		Epoch:        r.curProcEpoch,
+		TTL:          1,
+		PrivateKey:   key,
+		SessionToken: r.prm.common.SessionToken(),
+		BearerToken:  r.prm.common.BearerToken(),
+		XHeaders:     r.prm.common.XHeaders(),
+		IsRaw:        raw,
+	}
+
+	return rs.Head(ctx, addr, prm)
+}

pkg/services/object/get/request.go

@@ -23,7 +23,7 @@ type request struct {
 
 	infoSplit *objectSDK.SplitInfo
 
-	infoEC *objectSDK.ECInfo
+	infoEC *ecInfo
 
 	log *logger.Logger
 
@@ -141,7 +141,7 @@ func (r *request) initEpoch() bool {
 func (r *request) generateTraverser(addr oid.Address) (*placement.Traverser, bool) {
 	obj := addr.Object()
 
-	t, err := r.traverserGenerator.GenerateTraverser(addr.Container(), &obj, r.curProcEpoch)
+	t, _, err := r.traverserGenerator.GenerateTraverser(addr.Container(), &obj, r.curProcEpoch)
 
 	switch {
 	default:

pkg/services/object/get/types.go

@@ -6,6 +6,7 @@ import (
 	"errors"
 
 	coreclient "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/client"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/container"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/engine"
 	internalclient "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object/internal/client"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object/util"
@@ -23,7 +24,7 @@ type epochSource interface {
 }
 
 type traverserGenerator interface {
-	GenerateTraverser(cid.ID, *oid.ID, uint64) (*placement.Traverser, error)
+	GenerateTraverser(cid.ID, *oid.ID, uint64) (*placement.Traverser, *container.Container, error)
 }
 
 type keyStorage interface {
@@ -236,3 +237,51 @@ type RangeHashRes struct {
 func (r *RangeHashRes) Hashes() [][]byte {
 	return r.hashes
 }
+
+type ecInfo struct {
+	localChunks  []objectSDK.ECChunk
+	remoteChunks map[string][]objectSDK.ECChunk // node pk -> chunk slice
+}
+
+func newECInfo() *ecInfo {
+	return &ecInfo{
+		localChunks:  make([]objectSDK.ECChunk, 0),
+		remoteChunks: make(map[string][]objectSDK.ECChunk),
+	}
+}
+
+func (e *ecInfo) addLocal(ecInfo *objectSDK.ECInfo) *objectSDK.ECInfoError {
+	for _, ch := range ecInfo.Chunks {
+		e.localChunks = append(e.localChunks, objectSDK.ECChunk(ch))
+	}
+	return e.createECInfoErr()
+}
+
+func (e *ecInfo) addRemote(nodePK string, ecInfo *objectSDK.ECInfo) *objectSDK.ECInfoError {
+	for _, ch := range ecInfo.Chunks {
+		e.remoteChunks[nodePK] = append(e.remoteChunks[nodePK], objectSDK.ECChunk(ch))
+	}
+	return e.createECInfoErr()
+}
+
+func (e *ecInfo) createECInfoErr() *objectSDK.ECInfoError {
+	unique := make(map[string]struct{})
+	result := objectSDK.NewECInfo()
+	for _, ch := range e.localChunks {
+		if _, found := unique[string(ch.ID.GetValue())]; found {
+			continue
+		}
+		result.AddChunk(ch)
+		unique[string(ch.ID.GetValue())] = struct{}{}
+	}
+	for _, chunks := range e.remoteChunks {
+		for _, ch := range chunks {
+			if _, found := unique[string(ch.ID.GetValue())]; found {
+				continue
+			}
+			result.AddChunk(ch)
+			unique[string(ch.ID.GetValue())] = struct{}{}
+		}
+	}
+	return objectSDK.NewECInfoError(result)
+}

pkg/services/object/search/container.go

@@ -47,7 +47,7 @@ func (exec *execCtx) processCurrentEpoch(ctx context.Context) error {
 		zap.Uint64("number", exec.curProcEpoch),
 	)
 
-	traverser, err := exec.svc.traverserGenerator.GenerateTraverser(exec.containerID(), nil, exec.curProcEpoch)
+	traverser, _, err := exec.svc.traverserGenerator.GenerateTraverser(exec.containerID(), nil, exec.curProcEpoch)
 	if err != nil {
 		return fmt.Errorf("%s: %w", logs.SearchCouldNotGenerateContainerTraverser, err)
 	}

pkg/services/object/search/search_test.go

@@ -11,6 +11,7 @@ import (
 
 	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/session"
 	clientcore "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/client"
+	containerCore "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/container"
 	netmapcore "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/netmap"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/network"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object/util"
@@ -80,12 +81,13 @@ func newTestStorage() *testStorage {
 	}
 }
 
-func (g *testTraverserGenerator) GenerateTraverser(_ cid.ID, _ *oid.ID, epoch uint64) (*placement.Traverser, error) {
+func (g *testTraverserGenerator) GenerateTraverser(_ cid.ID, _ *oid.ID, epoch uint64) (*placement.Traverser, *containerCore.Container, error) {
-	return placement.NewTraverser(
+	t, err := placement.NewTraverser(
 		placement.ForContainer(g.c),
 		placement.UseBuilder(g.b[epoch]),
 		placement.WithoutSuccessTracking(),
 	)
+	return t, &containerCore.Container{Value: g.c}, err
 }
 
 func (p *testPlacementBuilder) BuildPlacement(cnr cid.ID, obj *oid.ID, _ netmap.PlacementPolicy) ([][]netmap.NodeInfo, error) {

pkg/services/object/search/service.go

@@ -4,6 +4,7 @@ import (
 	"context"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/client"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/container"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/netmap"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/engine"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object/util"
@@ -45,7 +46,7 @@ type cfg struct {
 	}
 
 	traverserGenerator interface {
-		GenerateTraverser(cid.ID, *oid.ID, uint64) (*placement.Traverser, error)
+		GenerateTraverser(cid.ID, *oid.ID, uint64) (*placement.Traverser, *container.Container, error)
 	}
 
 	currentEpochReceiver interface {

pkg/services/object/util/placement.go

@@ -122,17 +122,17 @@ func (g *TraverserGenerator) WithTraverseOptions(opts ...placement.Option) *Trav
 
 // GenerateTraverser generates placement Traverser for provided object address
 // using epoch-th network map.
-func (g *TraverserGenerator) GenerateTraverser(idCnr cid.ID, idObj *oid.ID, epoch uint64) (*placement.Traverser, error) {
+func (g *TraverserGenerator) GenerateTraverser(idCnr cid.ID, idObj *oid.ID, epoch uint64) (*placement.Traverser, *container.Container, error) {
 	// get network map by epoch
 	nm, err := g.netMapSrc.GetNetMapByEpoch(epoch)
 	if err != nil {
-		return nil, fmt.Errorf("could not get network map #%d: %w", epoch, err)
+		return nil, nil, fmt.Errorf("could not get network map #%d: %w", epoch, err)
 	}
 
 	// get container related container
 	cnr, err := g.cnrSrc.Get(idCnr)
 	if err != nil {
-		return nil, fmt.Errorf("could not get container: %w", err)
+		return nil, nil, fmt.Errorf("could not get container: %w", err)
 	}
 
 	// allocate placement traverser options
@@ -160,5 +160,9 @@ func (g *TraverserGenerator) GenerateTraverser(idCnr cid.ID, idObj *oid.ID, epoc
 		)
 	}
 
-	return placement.NewTraverser(traverseOpts...)
+	t, err := placement.NewTraverser(traverseOpts...)
+	if err != nil {
+		return nil, nil, err
+	}
+	return t, cnr, nil
 }