[#1103] node: Implement Get\Head requests for EC object

Signed-off-by: Anton Nikiforov <an.nikiforov@yadro.com>

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

@@ -99,6 +99,10 @@ func getObject(cmd *cobra.Command, _ []string) {
 			return
 		}
 
+		if ok := printECInfoErr(cmd, err); ok {
+			return
+		}
+
 		commonCmd.ExitOnErr(cmd, "rpc error: %w", err)
 	}
 

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

@@ -70,6 +70,10 @@ func getObjectHeader(cmd *cobra.Command, _ []string) {
 			return
 		}
 
+		if ok := printECInfoErr(cmd, err); ok {
+			return
+		}
+
 		commonCmd.ExitOnErr(cmd, "rpc error: %w", err)
 	}
 

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

@@ -146,6 +146,50 @@ func marshalSplitInfo(cmd *cobra.Command, info *objectSDK.SplitInfo) ([]byte, er
 	}
 }
 
+func printECInfoErr(cmd *cobra.Command, err error) bool {
+	var errECInfo *objectSDK.ECInfoError
+
+	ok := errors.As(err, &errECInfo)
+
+	if ok {
+		cmd.PrintErrln("Object is erasure-encoded, ec information received.")
+		printECInfo(cmd, errECInfo.ECInfo())
+	}
+
+	return ok
+}
+
+func printECInfo(cmd *cobra.Command, info *objectSDK.ECInfo) {
+	bs, err := marshalECInfo(cmd, info)
+	commonCmd.ExitOnErr(cmd, "can't marshal split info: %w", err)
+
+	cmd.Println(string(bs))
+}
+
+func marshalECInfo(cmd *cobra.Command, info *objectSDK.ECInfo) ([]byte, error) {
+	toJSON, _ := cmd.Flags().GetBool(commonflags.JSON)
+	toProto, _ := cmd.Flags().GetBool("proto")
+	switch {
+	case toJSON && toProto:
+		return nil, errors.New("'--json' and '--proto' flags are mutually exclusive")
+	case toJSON:
+		return info.MarshalJSON()
+	case toProto:
+		return info.Marshal()
+	default:
+		b := bytes.NewBuffer(nil)
+		b.WriteString("Total chunks: " + strconv.Itoa(int(info.Chunks[0].Total)))
+		for _, chunk := range info.Chunks {
+			var id oid.ID
+			if err := id.Decode(chunk.ID.GetValue()); err != nil {
+				return nil, fmt.Errorf("unable to decode chunk id: %w", err)
+			}
+			b.WriteString("\n  Index: " + strconv.Itoa(int(chunk.Index)) + " ID: " + id.String())
+		}
+		return b.Bytes(), nil
+	}
+}
+
 func getRangeList(cmd *cobra.Command) ([]objectSDK.Range, error) {
 	v := cmd.Flag("range").Value.String()
 	if len(v) == 0 {

cmd/frostfs-node/object.go

@@ -173,7 +173,7 @@ func initObjectService(c *cfg) {
 
 	sSearchV2 := createSearchSvcV2(sSearch, keyStorage)
 
-	sGet := createGetService(c, keyStorage, traverseGen, c.clientCache)
+	sGet := createGetService(c, keyStorage, traverseGen, c.clientCache, c.cfgObject.cnrSource)
 
 	*c.cfgObject.getSvc = *sGet // need smth better
 
@@ -358,6 +358,7 @@ func createSearchSvcV2(sSearch *searchsvc.Service, keyStorage *util.KeyStorage)
 
 func createGetService(c *cfg, keyStorage *util.KeyStorage, traverseGen *util.TraverserGenerator,
 	coreConstructor *cache.ClientCache,
+	containerSource containercore.Source,
 ) *getsvc.Service {
 	ls := c.cfgObject.cfgLocalStorage.localStorage
 
@@ -369,6 +370,7 @@ func createGetService(c *cfg, keyStorage *util.KeyStorage, traverseGen *util.Tra
 			placement.SuccessAfter(1),
 		),
 		coreConstructor,
+		containerSource,
 		getsvc.WithLogger(c.log))
 }
 

go.mod

@@ -4,10 +4,10 @@ go 1.21
 
 require (
 	code.gitea.io/sdk/gitea v0.17.1
-	git.frostfs.info/TrueCloudLab/frostfs-api-go/v2 v2.16.1-0.20240327095603-491a47e7fe24
+	git.frostfs.info/TrueCloudLab/frostfs-api-go/v2 v2.16.1-0.20240422151450-df9b65324a4c
 	git.frostfs.info/TrueCloudLab/frostfs-contract v0.19.0
 	git.frostfs.info/TrueCloudLab/frostfs-observability v0.0.0-20231101111734-b3ad3335ff65
-	git.frostfs.info/TrueCloudLab/frostfs-sdk-go v0.0.0-20240329104804-ec0cb2169f92
+	git.frostfs.info/TrueCloudLab/frostfs-sdk-go v0.0.0-20240424080726-20ab57bf7ec3
 	git.frostfs.info/TrueCloudLab/hrw v1.2.1
 	git.frostfs.info/TrueCloudLab/policy-engine v0.0.0-20240412130734-0e69e485115a
 	git.frostfs.info/TrueCloudLab/tzhash v1.8.0

internal/logs/logs.go

@@ -99,9 +99,17 @@ const (
 	GetRemoteCallFailed                                                     = "remote call failed"
 	GetCanNotAssembleTheObject                                              = "can not assemble the object"
 	GetTryingToAssembleTheObject                                            = "trying to assemble the object..."
+	GetTryingToAssembleTheECObject                                          = "trying to assemble the ec object..."
 	GetAssemblingSplittedObject                                             = "assembling splitted object..."
+	GetAssemblingECObject                                                   = "assembling erasure-coded object..."
+	GetUnableToGetAllPartsECObject                                          = "unable to get all parts, continue to reconstruct with existed"
+	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"
 	GetAssemblingSplittedObjectCompleted                                    = "assembling splitted object completed"
+	GetAssemblingECObjectCompleted                                          = "assembling erasure-coded object completed"
 	GetFailedToAssembleSplittedObject                                       = "failed to assemble splitted object"
+	GetFailedToAssembleECObject                                             = "failed to assemble erasure-coded object"
 	GetCouldNotGenerateContainerTraverser                                   = "could not generate container traverser"
 	GetCouldNotConstructRemoteNodeClient                                    = "could not construct remote node client"
 	GetCouldNotWriteHeader                                                  = "could not write header"
@@ -111,6 +119,7 @@ const (
 	GetCompletingTheOperation                                               = "completing the operation"
 	GetRequestedObjectWasMarkedAsRemoved                                    = "requested object was marked as removed"
 	GetRequestedObjectIsVirtual                                             = "requested object is virtual"
+	GetRequestedObjectIsEC                                                  = "requested object is erasure-coded"
 	GetRequestedRangeIsOutOfObjectBounds                                    = "requested range is out of object bounds"
 	PutAdditionalContainerBroadcastFailure                                  = "additional container broadcast failure"
 	SearchReturnResultDirectly                                              = "return result directly"

pkg/local_object_storage/engine/get.go

@@ -88,6 +88,10 @@ func (e *StorageEngine) get(ctx context.Context, prm GetPrm) (GetRes, error) {
 		return GetRes{}, logicerr.Wrap(objectSDK.NewSplitInfoError(it.SplitInfo))
 	}
 
+	if it.ECInfo != nil {
+		return GetRes{}, logicerr.Wrap(objectSDK.NewECInfoError(it.ECInfo))
+	}
+
 	if it.ObjectExpired {
 		return GetRes{}, errNotFound
 	}
@@ -119,6 +123,7 @@ func (e *StorageEngine) get(ctx context.Context, prm GetPrm) (GetRes, error) {
 type getShardIterator struct {
 	Object        *objectSDK.Object
 	SplitInfo     *objectSDK.SplitInfo
+	ECInfo        *objectSDK.ECInfo
 	OutError      error
 	ShardWithMeta hashedShard
 	MetaError     error
@@ -130,6 +135,7 @@ type getShardIterator struct {
 	Engine   *StorageEngine
 
 	splitInfoErr *objectSDK.SplitInfoError
+	ecInfoErr    *objectSDK.ECInfoError
 }
 
 func (i *getShardIterator) tryGetWithMeta(ctx context.Context) {
@@ -164,6 +170,14 @@ func (i *getShardIterator) tryGetWithMeta(ctx context.Context) {
 
 			// stop iterating over shards if SplitInfo structure is complete
 			return withLink && withLast
+		case errors.As(err, &i.ecInfoErr):
+			if i.ECInfo == nil {
+				i.ECInfo = objectSDK.NewECInfo()
+			}
+
+			util.MergeECInfo(i.ecInfoErr.ECInfo(), i.ECInfo)
+			// stop iterating over shards if ECInfo structure is complete
+			return len(i.ECInfo.Chunks) == int(i.ECInfo.Chunks[0].Total)
 		case client.IsErrObjectAlreadyRemoved(err):
 			i.OutError = err
 			return true // stop, return it back

pkg/local_object_storage/engine/head.go

@@ -75,6 +75,8 @@ func (e *StorageEngine) head(ctx context.Context, prm HeadPrm) (HeadRes, error)
 		head     *objectSDK.Object
 		siErr    *objectSDK.SplitInfoError
 		outSI    *objectSDK.SplitInfo
+		eiErr    *objectSDK.ECInfoError
+		outEI    *objectSDK.ECInfo
 		outError error = new(apistatus.ObjectNotFound)
 		shPrm    shard.HeadPrm
 	)
@@ -99,6 +101,13 @@ func (e *StorageEngine) head(ctx context.Context, prm HeadPrm) (HeadRes, error)
 					return true
 				}
 				return false
+			case errors.As(err, &eiErr):
+				if outEI == nil {
+					outEI = objectSDK.NewECInfo()
+				}
+				util.MergeECInfo(eiErr.ECInfo(), outEI)
+				// stop iterating over shards if ECInfo structure is complete
+				return len(outEI.Chunks) == int(outEI.Chunks[0].Total)
 			case client.IsErrObjectAlreadyRemoved(err):
 				outError = err
 				return true // stop, return it back
@@ -118,6 +127,8 @@ func (e *StorageEngine) head(ctx context.Context, prm HeadPrm) (HeadRes, error)
 
 	if outSI != nil {
 		return HeadRes{}, logicerr.Wrap(objectSDK.NewSplitInfoError(outSI))
+	} else if outEI != nil {
+		return HeadRes{}, logicerr.Wrap(objectSDK.NewECInfoError(outEI))
 	} else if head == nil {
 		return HeadRes{}, outError
 	}

pkg/local_object_storage/metabase/exists.go

@@ -108,6 +108,10 @@ func (db *DB) exists(tx *bbolt.Tx, addr oid.Address, currEpoch uint64) (exists b
 
 		return false, logicerr.Wrap(objectSDK.NewSplitInfoError(splitInfo))
 	}
+	// if parent bucket is empty, then check if object exists in ec bucket
+	if data := getFromBucket(tx, ecInfoBucketName(cnr, key), objKey); len(data) != 0 {
+		return false, getECInfoError(tx, cnr, data)
+	}
 
 	// if parent bucket is empty, then check if object exists in typed buckets
 	return firstIrregularObjectType(tx, cnr, objKey) != objectSDK.TypeRegular, nil

pkg/local_object_storage/metabase/get.go

@@ -110,6 +110,11 @@ func (db *DB) get(tx *bbolt.Tx, addr oid.Address, key []byte, checkStatus, raw b
 		return obj, obj.Unmarshal(data)
 	}
 
+	data = getFromBucket(tx, ecInfoBucketName(cnr, bucketName), key)
+	if len(data) != 0 {
+		return nil, getECInfoError(tx, cnr, data)
+	}
+
 	// if not found then check in tombstone index
 	data = getFromBucket(tx, tombstoneBucketName(cnr, bucketName), key)
 	if len(data) != 0 {
@@ -185,3 +190,27 @@ func getSplitInfoError(tx *bbolt.Tx, cnr cid.ID, key []byte) error {
 
 	return logicerr.Wrap(new(apistatus.ObjectNotFound))
 }
+
+func getECInfoError(tx *bbolt.Tx, cnr cid.ID, data []byte) error {
+	offset := 0
+	ecInfo := objectSDK.NewECInfo()
+	for offset < len(data) {
+		key := data[offset : offset+objectKeySize]
+		// check in primary index
+		ojbData := getFromBucket(tx, primaryBucketName(cnr, make([]byte, bucketKeySize)), key)
+		if len(data) != 0 {
+			obj := objectSDK.New()
+			if err := obj.Unmarshal(ojbData); err != nil {
+				return err
+			}
+			chunk := objectSDK.ECChunk{}
+			id, _ := obj.ID()
+			chunk.SetID(id)
+			chunk.Index = obj.ECHeader().Index()
+			chunk.Total = obj.ECHeader().Total()
+			ecInfo.AddChunk(chunk)
+		}
+		offset += objectKeySize
+	}
+	return logicerr.Wrap(objectSDK.NewECInfoError(ecInfo))
+}

pkg/local_object_storage/metabase/get_test.go

@@ -3,6 +3,7 @@ package meta_test
 import (
 	"bytes"
 	"context"
+	"errors"
 	"fmt"
 	"os"
 	"runtime"
@@ -15,8 +16,10 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client"
 	cidtest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id/test"
 	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/erasurecode"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	oidtest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id/test"
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 	"github.com/stretchr/testify/require"
 )
 
@@ -109,6 +112,42 @@ func TestDB_Get(t *testing.T) {
 		require.True(t, binaryEqual(child.CutPayload(), newChild))
 	})
 
+	t.Run("put erasure-coded object", func(t *testing.T) {
+		cnr := cidtest.ID()
+		virtual := testutil.GenerateObjectWithCID(cnr)
+		c, err := erasurecode.NewConstructor(3, 1)
+		require.NoError(t, err)
+		pk, err := keys.NewPrivateKey()
+		require.NoError(t, err)
+		parts, err := c.Split(virtual, &pk.PrivateKey)
+		require.NoError(t, err)
+		for _, part := range parts {
+			err = putBig(db, part)
+			var eiError *objectSDK.ECInfoError
+			if err != nil && !errors.As(err, &eiError) {
+				require.NoError(t, err)
+			}
+		}
+		_, err = metaGet(db, object.AddressOf(virtual), true)
+		var eiError *objectSDK.ECInfoError
+		require.ErrorAs(t, err, &eiError)
+		require.Equal(t, len(eiError.ECInfo().Chunks), len(parts))
+		for _, chunk := range eiError.ECInfo().Chunks {
+			var found bool
+			for _, part := range parts {
+				partID, _ := part.ID()
+				var chunkID oid.ID
+				require.NoError(t, chunkID.ReadFromV2(chunk.ID))
+				if chunkID.Equals(partID) {
+					found = true
+				}
+			}
+			if !found {
+				require.Fail(t, "chunk not found")
+			}
+		}
+	})
+
 	t.Run("get removed object", func(t *testing.T) {
 		obj := oidtest.Address()
 		ts := oidtest.Address()

pkg/local_object_storage/metabase/put.go

@@ -1,6 +1,7 @@
 package meta
 
 import (
+	"bytes"
 	"context"
 	"encoding/binary"
 	"errors"
@@ -264,6 +265,13 @@ func putUniqueIndexes(
 		if err != nil {
 			return err
 		}
+
+		if ecHead := obj.GetECHeader(); ecHead != nil {
+			err = putECInfo(tx, cnr, objKey, ecHead)
+			if err != nil {
+				return err
+			}
+		}
 	}
 
 	return nil
@@ -571,3 +579,34 @@ func isLinkObject(obj *objectSDK.Object) bool {
 func isLastObject(obj *objectSDK.Object) bool {
 	return len(obj.Children()) == 0 && obj.Parent() != nil
 }
+
+func putECInfo(tx *bbolt.Tx,
+	cnr cid.ID, objKey []byte,
+	ecHead *objectSDK.ECHeader,
+) error {
+	parentID := objectKey(ecHead.Parent(), make([]byte, objectKeySize))
+	bucketName := make([]byte, bucketKeySize)
+
+	val := getFromBucket(tx, ecInfoBucketName(cnr, bucketName), parentID)
+	if len(val) == 0 {
+		val = objKey
+	} else {
+		offset := 0
+		found := false
+		for offset < len(val) {
+			if bytes.Equal(objKey, val[offset:offset+objectKeySize]) {
+				found = true
+				break
+			}
+			offset += objectKeySize
+		}
+		if !found {
+			val = append(val, objKey...)
+		}
+	}
+	return putUniqueIndexItem(tx, namedBucketItem{
+		name: ecInfoBucketName(cnr, make([]byte, bucketKeySize)),
+		key:  parentID,
+		val:  val,
+	})
+}

pkg/local_object_storage/metabase/util.go

@@ -119,6 +119,11 @@ const (
 	//	Key: container ID + type
 	//  Value: container size in bytes as little-endian uint64
 	containerCountersPrefix
+
+	// ecInfoPrefix is used for storing relation between EC parent id and chunk id.
+	//	Key: container ID + type
+	//  Value: Object id
+	ecInfoPrefix
 )
 
 const (
@@ -190,6 +195,11 @@ func splitBucketName(cnr cid.ID, key []byte) []byte {
 	return bucketName(cnr, splitPrefix, key)
 }
 
+// ecInfoBucketName returns <CID>_ecinfo.
+func ecInfoBucketName(cnr cid.ID, key []byte) []byte {
+	return bucketName(cnr, ecInfoPrefix, key)
+}
+
 // addressKey returns key for K-V tables when key is a whole address.
 func addressKey(addr oid.Address, key []byte) []byte {
 	addr.Container().Encode(key)

pkg/local_object_storage/util/ecinfo.go

@@ -0,0 +1,25 @@
+package util
+
+import (
+	"bytes"
+
+	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
+)
+
+// MergeECInfo ignores conflicts and rewrites `to` with non empty values
+// from `from`.
+func MergeECInfo(from, to *objectSDK.ECInfo) *objectSDK.ECInfo {
+	for _, fchunk := range from.Chunks {
+		add := true
+		for _, tchunk := range to.Chunks {
+			if bytes.Equal(tchunk.ID.GetValue(), fchunk.ID.GetValue()) {
+				add = false
+				break
+			}
+		}
+		if add {
+			to.AddChunk(*objectSDK.NewECChunkFromV2(&fchunk))
+		}
+	}
+	return to
+}

pkg/local_object_storage/util/ecinfo_test.go

@@ -0,0 +1,56 @@
+package util
+
+import (
+	"crypto/rand"
+	"testing"
+
+	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
+	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
+	"github.com/stretchr/testify/require"
+)
+
+func TestMergeECInfo(t *testing.T) {
+	id := generateV2ID()
+	target := objectSDK.NewECInfo()
+	var chunk objectSDK.ECChunk
+	chunk.Total = 2
+	chunk.Index = 0
+	chunk.SetID(id)
+	target.AddChunk(chunk)
+
+	t.Run("merge empty", func(t *testing.T) {
+		to := objectSDK.NewECInfo()
+
+		result := MergeECInfo(target, to)
+		require.Equal(t, result, target)
+	})
+
+	t.Run("merge existed", func(t *testing.T) {
+		to := objectSDK.NewECInfo()
+		to.AddChunk(chunk)
+
+		result := MergeECInfo(target, to)
+		require.Equal(t, result, target)
+	})
+	t.Run("merge extend", func(t *testing.T) {
+		to := objectSDK.NewECInfo()
+		var chunk objectSDK.ECChunk
+		chunk.Total = 2
+		chunk.Index = 1
+		chunk.SetID(generateV2ID())
+		to.AddChunk(chunk)
+
+		result := MergeECInfo(target, to)
+		require.Equal(t, len(result.Chunks), 2)
+	})
+}
+
+func generateV2ID() oid.ID {
+	var buf [32]byte
+	_, _ = rand.Read(buf[:])
+
+	var id oid.ID
+	_ = id.Decode(buf[:])
+
+	return id
+}

pkg/network/cache/multi.go

@@ -167,8 +167,9 @@ func (x *multiClient) iterateClients(ctx context.Context, f func(clientcore.Clie
 		// from the SDK client; should not be considered
 		// as a connection error
 		var siErr *objectSDK.SplitInfoError
+		var eiErr *objectSDK.ECInfoError
 
-		success := err == nil || errors.Is(err, context.Canceled) || errors.As(err, &siErr)
+		success := err == nil || errors.Is(err, context.Canceled) || errors.As(err, &siErr) || errors.As(err, &eiErr)
 		if success || firstErr == nil || errors.Is(firstErr, errRecentlyFailed) {
 			firstErr = err
 		}
@@ -196,7 +197,8 @@ func (x *multiClient) ReportError(err error) {
 	// from the SDK client; should not be considered
 	// as a connection error
 	var siErr *objectSDK.SplitInfoError
-	if errors.As(err, &siErr) {
+	var eiErr *objectSDK.ECInfoError
+	if errors.As(err, &siErr) || errors.As(err, &eiErr) {
 		return
 	}
 

pkg/services/object/get/assemble.go

@@ -139,9 +139,11 @@ func (r *request) getObjectWithIndependentRequest(ctx context.Context, prm Reque
 		remoteStorageConstructor: r.remoteStorageConstructor,
 		epochSource:              r.epochSource,
 		localStorage:             r.localStorage,
+		containerSource:          r.containerSource,
 
 		prm:       prm,
 		infoSplit: objectSDK.NewSplitInfo(),
+		infoEC:    objectSDK.NewECInfo(),
 		log:       r.log,
 	}
 

pkg/services/object/get/assembleec.go

@@ -0,0 +1,79 @@
+package getsvc
+
+import (
+	"context"
+	"errors"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
+	apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
+	"go.uber.org/zap"
+)
+
+func (r *request) assembleEC(ctx context.Context) {
+	if r.isRaw() {
+		r.log.Debug(logs.GetCanNotAssembleTheObject)
+		return
+	}
+
+	// Any access tokens are not expected to be used in the assembly process:
+	//  - there is no requirement to specify child objects in session/bearer
+	//    token for `GET`/`GETRANGE`/`RANGEHASH` requests in the API protocol,
+	//    and, therefore, their missing in the original request should not be
+	//    considered as error; on the other hand, without session for every child
+	//    object, it is impossible to attach bearer token in the new generated
+	//    requests correctly because the token has not been issued for that node's
+	//    key;
+	//  - the assembly process is expected to be handled on a container node
+	//    only since the requests forwarding mechanism presentation; such the
+	//    node should have enough rights for getting any child object by design.
+	r.prm.common.ForgetTokens()
+
+	// Do not use forwarding during assembly stage.
+	// Request forwarding closure inherited in produced
+	// `execCtx` so it should be disabled there.
+	r.disableForwarding()
+
+	r.log.Debug(logs.GetTryingToAssembleTheECObject)
+
+	assembler := newAssemblerEC(r.address(), r.infoEC, r.ctxRange(), r, r.containerSource, r.log)
+
+	r.log.Debug(logs.GetAssemblingECObject,
+		zap.Stringer("address", r.address()),
+		zap.Uint64("range_offset", r.ctxRange().GetOffset()),
+		zap.Uint64("range_length", r.ctxRange().GetLength()),
+	)
+	defer r.log.Debug(logs.GetAssemblingECObjectCompleted,
+		zap.Stringer("address", r.address()),
+		zap.Uint64("range_offset", r.ctxRange().GetOffset()),
+		zap.Uint64("range_length", r.ctxRange().GetLength()),
+	)
+
+	obj, err := assembler.Assemble(ctx, r.prm.objWriter, r.headOnly())
+	if err != nil {
+		r.log.Warn(logs.GetFailedToAssembleECObject,
+			zap.Error(err),
+			zap.Stringer("address", r.address()),
+			zap.Uint64("range_offset", r.ctxRange().GetOffset()),
+			zap.Uint64("range_length", r.ctxRange().GetLength()),
+		)
+	}
+
+	var errRemoved *apistatus.ObjectAlreadyRemoved
+	var errOutOfRange *apistatus.ObjectOutOfRange
+
+	switch {
+	default:
+		r.status = statusUndefined
+		r.err = err
+	case err == nil:
+		r.status = statusOK
+		r.err = nil
+		r.collectedObject = obj
+	case errors.As(err, &errRemoved):
+		r.status = statusINHUMED
+		r.err = errRemoved
+	case errors.As(err, &errOutOfRange):
+		r.status = statusOutOfRange
+		r.err = errOutOfRange
+	}
+}

pkg/services/object/get/assemblerec.go

@@ -0,0 +1,117 @@
+package getsvc
+
+import (
+	"context"
+	"fmt"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
+	"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/util/logger"
+	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/erasurecode"
+	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
+	"go.uber.org/zap"
+	"golang.org/x/sync/errgroup"
+)
+
+type assemblerec struct {
+	addr      oid.Address
+	ecInfo    *objectSDK.ECInfo
+	rng       *objectSDK.Range
+	objGetter objectGetter
+	cs        container.Source
+	log       *logger.Logger
+}
+
+func newAssemblerEC(
+	addr oid.Address,
+	ecInfo *objectSDK.ECInfo,
+	rng *objectSDK.Range,
+	objGetter objectGetter,
+	cs container.Source,
+	log *logger.Logger,
+) *assemblerec {
+	return &assemblerec{
+		addr:      addr,
+		rng:       rng,
+		ecInfo:    ecInfo,
+		objGetter: objGetter,
+		cs:        cs,
+		log:       log,
+	}
+}
+
+// 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) {
+	parts := a.retrieveParts(ctx, headOnly)
+	cnt, err := a.cs.Get(a.addr.Container())
+	if err != nil {
+		return nil, err
+	}
+	c, err := erasurecode.NewConstructor(
+		policy.ECDataCount(cnt.Value.PlacementPolicy()),
+		policy.ECParityCount(cnt.Value.PlacementPolicy()),
+	)
+	if err != nil {
+		return nil, err
+	}
+	if headOnly {
+		obj, err := c.ReconstructHeader(parts)
+		if err == nil {
+			return obj, writer.WriteHeader(ctx, obj)
+		}
+		return nil, err
+	}
+	obj, err := c.Reconstruct(parts)
+	if err == nil {
+		err = writer.WriteHeader(ctx, obj.CutPayload())
+		if err == nil {
+			err = writer.WriteChunk(ctx, obj.Payload())
+			if err != nil {
+				return nil, err
+			}
+		}
+	}
+	return obj, err
+}
+
+func (a *assemblerec) retrieveParts(mainCtx context.Context, headOnly bool) []*objectSDK.Object {
+	parts := make([]*objectSDK.Object, int(a.ecInfo.Chunks[0].Total))
+	errGroup, ctx := errgroup.WithContext(mainCtx)
+
+	for i := range a.ecInfo.Chunks {
+		chunk := a.ecInfo.Chunks[i]
+		errGroup.Go(func() error {
+			objID := new(oid.ID)
+			err := objID.ReadFromV2(chunk.ID)
+			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 {
+		a.log.Debug(logs.GetUnableToGetAllPartsECObject, zap.Error(err))
+	}
+	return parts
+}

pkg/services/object/get/get.go

@@ -73,9 +73,12 @@ func (s *Service) get(ctx context.Context, prm RequestParameters) error {
 		remoteStorageConstructor: s.remoteStorageConstructor,
 		epochSource:              s.epochSource,
 		localStorage:             s.localStorage,
+		containerSource:          s.containerSource,
 
 		prm:       prm,
 		infoSplit: objectSDK.NewSplitInfo(),
+		infoEC:    objectSDK.NewECInfo(),
+		log:       s.log,
 	}
 
 	exec.setLogger(s.log)
@@ -106,6 +109,16 @@ func (exec *request) analyzeStatus(ctx context.Context, execCnr bool) {
 		exec.assemble(ctx)
 	case statusOutOfRange:
 		exec.log.Debug(logs.GetRequestedRangeIsOutOfObjectBounds)
+	case statusEC:
+		if !exec.isLocal() {
+			if execCnr {
+				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/local.go

@@ -5,6 +5,7 @@ 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"
@@ -22,6 +23,7 @@ func (r *request) executeLocal(ctx context.Context) {
 	r.collectedObject, err = r.get(ctx)
 
 	var errSplitInfo *objectSDK.SplitInfoError
+	var errECInfo *objectSDK.ECInfoError
 	var errRemoved *apistatus.ObjectAlreadyRemoved
 	var errOutOfRange *apistatus.ObjectOutOfRange
 
@@ -42,6 +44,10 @@ func (r *request) executeLocal(ctx context.Context) {
 		r.status = statusVIRTUAL
 		mergeSplitInfo(r.splitInfo(), errSplitInfo.SplitInfo())
 		r.err = objectSDK.NewSplitInfoError(r.infoSplit)
+	case errors.As(err, &errECInfo):
+		r.status = statusEC
+		util.MergeECInfo(errECInfo.ECInfo(), r.infoEC)
+		r.err = objectSDK.NewECInfoError(r.infoEC)
 	case errors.As(err, &errOutOfRange):
 		r.status = statusOutOfRange
 		r.err = errOutOfRange

pkg/services/object/get/remote.go

@@ -7,6 +7,8 @@ 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"
@@ -27,15 +29,20 @@ func (r *request) processNode(ctx context.Context, info client.NodeInfo) bool {
 	obj, err := r.getRemote(ctx, rs, info)
 
 	var errSplitInfo *objectSDK.SplitInfoError
+	var errECInfo *objectSDK.ECInfoError
 	var errRemoved *apistatus.ObjectAlreadyRemoved
 	var errOutOfRange *apistatus.ObjectOutOfRange
 
 	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)
-
-		r.log.Debug(logs.GetRemoteCallFailed, zap.Error(err))
 	case err == nil:
 		r.status = statusOK
 		r.err = nil
@@ -57,6 +64,20 @@ func (r *request) processNode(ctx context.Context, info client.NodeInfo) bool {
 		r.status = statusVIRTUAL
 		mergeSplitInfo(r.splitInfo(), errSplitInfo.SplitInfo())
 		r.err = objectSDK.NewSplitInfoError(r.infoSplit)
+	case errors.As(err, &errECInfo):
+		r.status = statusEC
+		util.MergeECInfo(r.infoEC, 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

pkg/services/object/get/request.go

@@ -6,6 +6,7 @@ import (
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
 	clientcore "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/services/object/util"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object_manager/placement"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/logger"
@@ -22,6 +23,8 @@ type request struct {
 
 	infoSplit *objectSDK.SplitInfo
 
+	infoEC *objectSDK.ECInfo
+
 	log *logger.Logger
 
 	collectedObject *objectSDK.Object
@@ -33,6 +36,7 @@ type request struct {
 	traverserGenerator       traverserGenerator
 	remoteStorageConstructor remoteStorageConstructor
 	localStorage             localStorage
+	containerSource          container.Source
 }
 
 func (r *request) setLogger(l *logger.Logger) {

pkg/services/object/get/service.go

@@ -1,6 +1,7 @@
 package getsvc
 
 import (
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/container"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/logger"
 	"go.uber.org/zap"
 )
@@ -16,6 +17,7 @@ type Service struct {
 	epochSource              epochSource
 	keyStore                 keyStorage
 	remoteStorageConstructor remoteStorageConstructor
+	containerSource          container.Source
 }
 
 // New creates, initializes and returns utility serving
@@ -26,6 +28,7 @@ func New(
 	e localStorageEngine,
 	tg traverserGenerator,
 	cc clientConstructor,
+	cs container.Source,
 	opts ...Option,
 ) *Service {
 	result := &Service{
@@ -39,6 +42,7 @@ func New(
 		remoteStorageConstructor: &multiclientRemoteStorageConstructor{
 			clientConstructor: cc,
 		},
+		containerSource: cs,
 	}
 	for _, option := range opts {
 		option(result)

pkg/services/object/get/status.go

@@ -6,6 +6,7 @@ const (
 	statusINHUMED
 	statusVIRTUAL
 	statusOutOfRange
+	statusEC
 )
 
 type statusError struct {

pkg/services/object/get/v2/get_forwarder.go

@@ -166,6 +166,9 @@ func (f *getRequestForwarder) readStream(ctx context.Context, c client.MultiAddr
 		case *objectV2.SplitInfo:
 			si := objectSDK.NewSplitInfoFromV2(v)
 			return objectSDK.NewSplitInfoError(si)
+		case *objectV2.ECInfo:
+			ei := objectSDK.NewECInfoFromV2(v)
+			return objectSDK.NewECInfoError(ei)
 		}
 	}
 	return nil

pkg/services/object/get/v2/head_forwarder.go

@@ -84,6 +84,9 @@ func (f *headRequestForwarder) forwardRequestToNode(ctx context.Context, addr ne
 	case *objectV2.SplitInfo:
 		si := objectSDK.NewSplitInfoFromV2(v)
 		return nil, objectSDK.NewSplitInfoError(si)
+	case *objectV2.ECInfo:
+		ei := objectSDK.NewECInfoFromV2(v)
+		return nil, objectSDK.NewECInfoError(ei)
 	}
 
 	objv2 := new(objectV2.Object)

pkg/services/object/get/v2/service.go

@@ -82,10 +82,13 @@ func (s *Service) Get(req *objectV2.GetRequest, stream objectSvc.GetObjectStream
 	err = s.svc.Get(stream.Context(), *p)
 
 	var splitErr *objectSDK.SplitInfoError
+	var ecErr *objectSDK.ECInfoError
 
 	switch {
 	case errors.As(err, &splitErr):
 		return stream.Send(splitInfoResponse(splitErr.SplitInfo()))
+	case errors.As(err, &ecErr):
+		return stream.Send(ecInfoResponse(ecErr.ECInfo()))
 	default:
 		return err
 	}
@@ -123,11 +126,16 @@ func (s *Service) Head(ctx context.Context, req *objectV2.HeadRequest) (*objectV
 	err = s.svc.Head(ctx, *p)
 
 	var splitErr *objectSDK.SplitInfoError
+	var ecErr *objectSDK.ECInfoError
 
 	if errors.As(err, &splitErr) {
 		setSplitInfoHeadResponse(splitErr.SplitInfo(), resp)
 		err = nil
 	}
+	if errors.As(err, &ecErr) {
+		setECInfoHeadResponse(ecErr.ECInfo(), resp)
+		err = nil
+	}
 
 	return resp, err
 }

pkg/services/object/get/v2/util.go

@@ -270,6 +270,17 @@ func splitInfoResponse(info *objectSDK.SplitInfo) *objectV2.GetResponse {
 	return resp
 }
 
+func ecInfoResponse(info *objectSDK.ECInfo) *objectV2.GetResponse {
+	resp := new(objectV2.GetResponse)
+
+	body := new(objectV2.GetResponseBody)
+	resp.SetBody(body)
+
+	body.SetObjectPart(info.ToV2())
+
+	return resp
+}
+
 func splitInfoRangeResponse(info *objectSDK.SplitInfo) *objectV2.GetRangeResponse {
 	resp := new(objectV2.GetRangeResponse)
 
@@ -285,6 +296,10 @@ func setSplitInfoHeadResponse(info *objectSDK.SplitInfo, resp *objectV2.HeadResp
 	resp.GetBody().SetHeaderPart(info.ToV2())
 }
 
+func setECInfoHeadResponse(info *objectSDK.ECInfo, resp *objectV2.HeadResponse) {
+	resp.GetBody().SetHeaderPart(info.ToV2())
+}
+
 func toHashResponse(typ refs.ChecksumType, res *getsvc.RangeHashRes) *objectV2.GetRangeHashResponse {
 	resp := new(objectV2.GetRangeHashResponse)