[#661] blobovniczatree: Make Rebuild failover safe

Now move info stores in blobovnicza, so in case of failover
rebuild completes previous operation first.

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

internal/logs/logs.go

@@ -537,4 +537,15 @@ const (
 	BlobovniczaTreeRebuildingBlobovnicza                                    = "rebuilding blobovnicza..."
 	BlobovniczaTreeRebuildingBlobovniczaFailed                              = "rebuilding blobovnicza failed"
 	BlobovniczaTreeRebuildingBlobovniczaSuccess                             = "rebuilding blobovnicza completed successfully"
+	BlobovniczatreeCouldNotPutMoveInfoToSourceBlobovnicza                   = "could not put move info to source blobovnicza"
+	BlobovniczatreeCouldNotUpdateStorageID                                  = "could not update storage ID"
+	BlobovniczatreeCouldNotDropMoveInfo                                     = "could not drop move info from source blobovnicza"
+	BlobovniczatreeCouldNotDeleteFromSource                                 = "could not delete object from source blobovnicza"
+	BlobovniczaTreeCompletingPreviousRebuild                                = "completing previous rebuild if failed..."
+	BlobovniczaTreeCompletedPreviousRebuildSuccess                          = "previous rebuild completed successfully"
+	BlobovniczaTreeCompletedPreviousRebuildFailed                           = "failed to complete previous rebuild"
+	BlobovniczatreeCouldNotCheckExistenceInSourceDB                         = "could not check object existence in source blobovnicza"
+	BlobovniczatreeCouldNotCheckExistenceInTargetDB                         = "could not check object existence in target blobovnicza"
+	BlobovniczatreeCouldNotGetObjectFromSourceDB                            = "could not get object from source blobovnicza"
+	BlobovniczatreeCouldNotPutObjectToTargetDB                              = "could not put object to target blobovnicza"
 )

pkg/local_object_storage/blobovnicza/control.go

@@ -105,7 +105,7 @@ func (b *Blobovnicza) initializeCounters() error {
 	var size uint64
 	var items uint64
 	err := b.boltDB.View(func(tx *bbolt.Tx) error {
-		return b.iterateAllBuckets(tx, func(lower, upper uint64, b *bbolt.Bucket) (bool, error) {
+		return b.iterateAllDataBuckets(tx, func(lower, upper uint64, b *bbolt.Bucket) (bool, error) {
 			keysN := uint64(b.Stats().KeyN)
 			size += keysN * upper
 			items += keysN

pkg/local_object_storage/blobovnicza/delete.go

@@ -51,7 +51,7 @@ func (b *Blobovnicza) Delete(ctx context.Context, prm DeletePrm) (DeleteRes, err
 	var dataSize uint64
 
 	err := b.boltDB.Update(func(tx *bbolt.Tx) error {
-		return b.iterateAllBuckets(tx, func(lower, upper uint64, buck *bbolt.Bucket) (bool, error) {
+		return b.iterateAllDataBuckets(tx, func(lower, upper uint64, buck *bbolt.Bucket) (bool, error) {
 			objData := buck.Get(addrKey)
 			if objData == nil {
 				// object is not in bucket => continue iterating

pkg/local_object_storage/blobovnicza/exists.go

@@ -1,6 +1,7 @@
 package blobovnicza
 
 import (
+	"bytes"
 	"context"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-observability/tracing"
@@ -24,7 +25,10 @@ func (b *Blobovnicza) Exists(ctx context.Context, addr oid.Address) (bool, error
 	addrKey := addressKey(addr)
 
 	err := b.boltDB.View(func(tx *bbolt.Tx) error {
-		return tx.ForEach(func(_ []byte, buck *bbolt.Bucket) error {
+		return tx.ForEach(func(bucketName []byte, buck *bbolt.Bucket) error {
+			if bytes.Equal(bucketName, incompletedMoveBucketName) {
+				return nil
+			}
 			exists = buck.Get(addrKey) != nil
 			if exists {
 				return errInterruptForEach

pkg/local_object_storage/blobovnicza/get.go

@@ -57,7 +57,11 @@ func (b *Blobovnicza) Get(ctx context.Context, prm GetPrm) (GetRes, error) {
 	)
 
 	if err := b.boltDB.View(func(tx *bbolt.Tx) error {
-		return tx.ForEach(func(_ []byte, buck *bbolt.Bucket) error {
+		return tx.ForEach(func(bucketName []byte, buck *bbolt.Bucket) error {
+			if bytes.Equal(bucketName, incompletedMoveBucketName) {
+				return nil
+			}
+
 			data = buck.Get(addrKey)
 			if data == nil {
 				return nil

pkg/local_object_storage/blobovnicza/iterate.go

@@ -1,6 +1,7 @@
 package blobovnicza
 
 import (
+	"bytes"
 	"context"
 	"fmt"
 	"math"
@@ -12,11 +13,11 @@ import (
 	"go.opentelemetry.io/otel/trace"
 )
 
-// iterateAllBuckets iterates all buckets in db
+// iterateAllDataBuckets iterates all buckets in db
 //
 // If the maximum size of the object (b.objSizeLimit) has been changed to lower value,
 // then there may be more buckets than the current limit of the object size.
-func (b *Blobovnicza) iterateAllBuckets(tx *bbolt.Tx, f func(uint64, uint64, *bbolt.Bucket) (bool, error)) error {
+func (b *Blobovnicza) iterateAllDataBuckets(tx *bbolt.Tx, f func(uint64, uint64, *bbolt.Bucket) (bool, error)) error {
 	return b.iterateBucketKeys(false, func(lower uint64, upper uint64, key []byte) (bool, error) {
 		buck := tx.Bucket(key)
 		if buck == nil {
@@ -138,7 +139,10 @@ func (b *Blobovnicza) Iterate(ctx context.Context, prm IteratePrm) (IterateRes,
 	var elem IterationElement
 
 	if err := b.boltDB.View(func(tx *bbolt.Tx) error {
-		return tx.ForEach(func(name []byte, buck *bbolt.Bucket) error {
+		return tx.ForEach(func(bucketName []byte, buck *bbolt.Bucket) error {
+			if bytes.Equal(bucketName, incompletedMoveBucketName) {
+				return nil
+			}
 			return buck.ForEach(func(k, v []byte) error {
 				select {
 				case <-ctx.Done():

pkg/local_object_storage/blobovnicza/move.go

@@ -0,0 +1,108 @@
+package blobovnicza
+
+import (
+	"context"
+	"fmt"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-observability/tracing"
+	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
+	"go.etcd.io/bbolt"
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/trace"
+)
+
+var incompletedMoveBucketName = []byte("INCOMPLETED_MOVE")
+
+type MoveInfo struct {
+	Address         oid.Address
+	TargetStorageID []byte
+}
+
+func (b *Blobovnicza) PutMoveInfo(ctx context.Context, prm MoveInfo) error {
+	_, span := tracing.StartSpanFromContext(ctx, "Blobovnicza.PutMoveInfo",
+		trace.WithAttributes(
+			attribute.String("path", b.path),
+			attribute.String("address", prm.Address.EncodeToString()),
+			attribute.String("target_storage_id", string(prm.TargetStorageID)),
+		))
+	defer span.End()
+
+	key := addressKey(prm.Address)
+
+	return b.boltDB.Update(func(tx *bbolt.Tx) error {
+		bucket, err := tx.CreateBucketIfNotExists(incompletedMoveBucketName)
+		if err != nil {
+			return err
+		}
+
+		if err := bucket.Put(key, prm.TargetStorageID); err != nil {
+			return fmt.Errorf("(%T) failed to save move info: %w", b, err)
+		}
+
+		return nil
+	})
+}
+
+func (b *Blobovnicza) DropMoveInfo(ctx context.Context, address oid.Address) error {
+	_, span := tracing.StartSpanFromContext(ctx, "Blobovnicza.DropMoveInfo",
+		trace.WithAttributes(
+			attribute.String("path", b.path),
+			attribute.String("address", address.EncodeToString()),
+		))
+	defer span.End()
+
+	key := addressKey(address)
+
+	return b.boltDB.Update(func(tx *bbolt.Tx) error {
+		bucket := tx.Bucket(incompletedMoveBucketName)
+		if bucket == nil {
+			return nil
+		}
+
+		if err := bucket.Delete(key); err != nil {
+			return fmt.Errorf("(%T) failed to drop move info: %w", b, err)
+		}
+
+		c := bucket.Cursor()
+		k, v := c.First()
+		bucketEmpty := k == nil && v == nil
+		if bucketEmpty {
+			return tx.DeleteBucket(incompletedMoveBucketName)
+		}
+
+		return nil
+	})
+}
+
+func (b *Blobovnicza) ListMoveInfo(ctx context.Context) ([]MoveInfo, error) {
+	_, span := tracing.StartSpanFromContext(ctx, "Blobovnicza.ListMoveInfo",
+		trace.WithAttributes(
+			attribute.String("path", b.path),
+		))
+	defer span.End()
+
+	var result []MoveInfo
+	if err := b.boltDB.View(func(tx *bbolt.Tx) error {
+		bucket := tx.Bucket(incompletedMoveBucketName)
+		if bucket == nil {
+			return nil
+		}
+		return bucket.ForEach(func(k, v []byte) error {
+			var addr oid.Address
+			storageID := make([]byte, len(v))
+			if err := addressFromKey(&addr, k); err != nil {
+				return err
+			}
+			copy(storageID, v)
+			result = append(result, MoveInfo{
+				Address:         addr,
+				TargetStorageID: storageID,
+			})
+			return nil
+		})
+	}); err != nil {
+		return nil, err
+	}
+
+	return result, nil
+}

pkg/local_object_storage/blobstor/blobovniczatree/blobovnicza.go

@@ -56,11 +56,12 @@ import (
 type Blobovniczas struct {
 	cfg
 
-	commondbManager *dbManager
+	commondbManager        *dbManager
-	activeDBManager *activeDBManager
+	activeDBManager        *activeDBManager
-	dbCache         *dbCache
+	dbCache                *dbCache
-	dbFilesGuard    *sync.RWMutex
+	deleteProtectedObjects *addressMap
-	rebuildGuard    *sync.RWMutex
+	dbFilesGuard           *sync.RWMutex
+	rebuildGuard           *sync.RWMutex
 }
 
 var _ common.Storage = (*Blobovniczas)(nil)
@@ -87,6 +88,7 @@ func NewBlobovniczaTree(opts ...Option) (blz *Blobovniczas) {
 	blz.commondbManager = newDBManager(blz.rootPath, blz.blzOpts, blz.readOnly, blz.metrics.Blobovnicza(), blz.log)
 	blz.activeDBManager = newActiveDBManager(blz.commondbManager, blz.blzLeafWidth)
 	blz.dbCache = newDBCache(blz.openedCacheSize, blz.commondbManager)
+	blz.deleteProtectedObjects = newAddressMap()
 	blz.dbFilesGuard = &sync.RWMutex{}
 	blz.rebuildGuard = &sync.RWMutex{}
 

pkg/local_object_storage/blobstor/blobovniczatree/control.go

@@ -57,12 +57,20 @@ func (b *Blobovniczas) initializeDBs(ctx context.Context) error {
 		visited[p] = struct{}{}
 		eg.Go(func() error {
 			shBlz := b.getBlobovniczaWithoutCaching(p)
-			_, err := shBlz.Open()
+			blz, err := shBlz.Open()
 			if err != nil {
 				return err
 			}
 			defer shBlz.Close()
 
+			moveInfo, err := blz.ListMoveInfo(egCtx)
+			if err != nil {
+				return err
+			}
+			for _, move := range moveInfo {
+				b.deleteProtectedObjects.Add(move.Address)
+			}
+
 			b.log.Debug(logs.BlobovniczatreeBlobovniczaSuccessfullyInitializedClosing, zap.String("id", p))
 			return nil
 		})

pkg/local_object_storage/blobstor/blobovniczatree/delete.go

@@ -3,6 +3,7 @@ package blobovniczatree
 import (
 	"context"
 	"encoding/hex"
+	"errors"
 	"time"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
@@ -18,6 +19,8 @@ import (
 	"go.uber.org/zap"
 )
 
+var errObjectIsDeleteProtected = errors.New("object is delete protected")
+
 // Delete deletes object from blobovnicza tree.
 //
 // If blobocvnicza ID is specified, only this blobovnicza is processed.
@@ -49,6 +52,10 @@ func (b *Blobovniczas) Delete(ctx context.Context, prm common.DeletePrm) (res co
 		return common.DeleteRes{}, errRebuildInProgress
 	}
 
+	if b.deleteProtectedObjects.Contains(prm.Address) {
+		return common.DeleteRes{}, errObjectIsDeleteProtected
+	}
+
 	var bPrm blobovnicza.DeletePrm
 	bPrm.SetAddress(prm.Address)
 

pkg/local_object_storage/blobstor/blobovniczatree/iterate.go

@@ -176,16 +176,14 @@ func (b *Blobovniczas) iterateSorted(ctx context.Context, addr *oid.Address, cur
 //
 // Uses existed blobovnicza files for iteration.
 func (b *Blobovniczas) iterateExistingDBPaths(ctx context.Context, f func(string) (bool, error)) error {
+	b.dbFilesGuard.RLock()
+	defer b.dbFilesGuard.RUnlock()
+
 	_, err := b.iterateExistingDBPathsDFS(ctx, "", f)
 	return err
 }
 
 func (b *Blobovniczas) iterateExistingDBPathsDFS(ctx context.Context, path string, f func(string) (bool, error)) (bool, error) {
-	if path == "" {
-		b.dbFilesGuard.RLock()
-		defer b.dbFilesGuard.RUnlock()
-	}
-
 	sysPath := filepath.Join(b.rootPath, path)
 	entries, err := os.ReadDir(sysPath)
 	if os.IsNotExist(err) && b.readOnly && path == "" { // non initialized tree in read only mode
@@ -222,16 +220,14 @@ func (b *Blobovniczas) iterateExistingDBPathsDFS(ctx context.Context, path strin
 }
 
 func (b *Blobovniczas) iterateSortedDBPaths(ctx context.Context, addr oid.Address, f func(string) (bool, error)) error {
+	b.dbFilesGuard.RLock()
+	defer b.dbFilesGuard.RUnlock()
+
 	_, err := b.iterateSordedDBPathsInternal(ctx, "", addr, f)
 	return err
 }
 
 func (b *Blobovniczas) iterateSordedDBPathsInternal(ctx context.Context, path string, addr oid.Address, f func(string) (bool, error)) (bool, error) {
-	if path == "" {
-		b.dbFilesGuard.RLock()
-		defer b.dbFilesGuard.RUnlock()
-	}
-
 	sysPath := filepath.Join(b.rootPath, path)
 	entries, err := os.ReadDir(sysPath)
 	if os.IsNotExist(err) && b.readOnly && path == "" { // non initialized tree in read only mode

pkg/local_object_storage/blobstor/blobovniczatree/rebuild.go

@@ -5,11 +5,13 @@ import (
 	"errors"
 	"os"
 	"path/filepath"
+	"sync"
 	"time"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobovnicza"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	"go.uber.org/zap"
 )
@@ -24,8 +26,18 @@ func (b *Blobovniczas) Rebuild(ctx context.Context, prm common.RebuildPrm) (comm
 	b.rebuildGuard.Lock()
 	defer b.rebuildGuard.Unlock()
 
-	b.log.Debug(logs.BlobovniczaTreeCollectingDBToRebuild)
 	var res common.RebuildRes
+
+	b.log.Debug(logs.BlobovniczaTreeCompletingPreviousRebuild)
+	completedPreviosMoves, err := b.completeIncompletedMove(ctx, prm.MetaStorage)
+	res.ObjectsMoved += completedPreviosMoves
+	if err != nil {
+		b.log.Warn(logs.BlobovniczaTreeCompletedPreviousRebuildFailed, zap.Error(err))
+		return res, err
+	}
+	b.log.Debug(logs.BlobovniczaTreeCompletedPreviousRebuildSuccess)
+
+	b.log.Debug(logs.BlobovniczaTreeCollectingDBToRebuild)
 	dbsToMigrate, err := b.getDBsToRebuild(ctx)
 	if err != nil {
 		b.log.Warn(logs.BlobovniczaTreeCollectingDBToRebuildFailed, zap.Error(err))
@@ -82,7 +94,7 @@ func (b *Blobovniczas) rebuildDB(ctx context.Context, path string, meta common.M
 		shDB.Close()
 	}()
 
-	migratedObjects, err := b.moveObjects(ctx, blz, meta)
+	migratedObjects, err := b.moveObjects(ctx, blz, shDB.SystemPath(), meta)
 	if err != nil {
 		return migratedObjects, err
 	}
@@ -90,13 +102,13 @@ func (b *Blobovniczas) rebuildDB(ctx context.Context, path string, meta common.M
 	return migratedObjects, err
 }
 
-func (b *Blobovniczas) moveObjects(ctx context.Context, blz *blobovnicza.Blobovnicza, meta common.MetaStorage) (uint64, error) {
+func (b *Blobovniczas) moveObjects(ctx context.Context, blz *blobovnicza.Blobovnicza, blzPath string, meta common.MetaStorage) (uint64, error) {
 	var result uint64
 
 	var prm blobovnicza.IteratePrm
 	prm.DecodeAddresses()
 	prm.SetHandler(func(ie blobovnicza.IterationElement) error {
-		e := b.moveObject(ctx, ie.Address(), ie.ObjectData(), meta)
+		e := b.moveObject(ctx, blz, blzPath, ie.Address(), ie.ObjectData(), meta)
 		if e == nil {
 			result++
 		}
@@ -107,15 +119,28 @@ func (b *Blobovniczas) moveObjects(ctx context.Context, blz *blobovnicza.Blobovn
 	return result, err
 }
 
-func (b *Blobovniczas) moveObject(ctx context.Context, addr oid.Address, data []byte, metaStore common.MetaStorage) error {
+func (b *Blobovniczas) moveObject(ctx context.Context, source *blobovnicza.Blobovnicza, sourcePath string,
-	var pPrm common.PutPrm
+	addr oid.Address, data []byte, metaStore common.MetaStorage) error {
-	pPrm.Address = addr
+	it := &moveIterator{
-	pPrm.RawData = data
+		B:             b,
-	pRes, err := b.Put(ctx, pPrm)
+		ID:            nil,
-	if err != nil {
+		AllFull:       true,
-		return err
+		Address:       addr,
+		ObjectData:    data,
+		MetaStore:     metaStore,
+		Source:        source,
+		SourceSysPath: sourcePath,
 	}
-	return metaStore.UpdateStorageID(ctx, addr, pRes.StorageID)
+
+	if err := b.iterateDeepest(ctx, addr, func(lvlPath string) (bool, error) { return it.tryMoveToLvl(ctx, lvlPath) }); err != nil {
+		return err
+	} else if it.ID == nil {
+		if it.AllFull {
+			return common.ErrNoSpace
+		}
+		return errPutFailed
+	}
+	return nil
 }
 
 func (b *Blobovniczas) dropDB(ctx context.Context, path string, shDb *sharedDB) (bool, error) {
@@ -159,3 +184,222 @@ func (b *Blobovniczas) dropDirectoryIfEmpty(path string) error {
 	}
 	return b.dropDirectoryIfEmpty(filepath.Dir(path))
 }
+
+func (b *Blobovniczas) completeIncompletedMove(ctx context.Context, metaStore common.MetaStorage) (uint64, error) {
+	var count uint64
+	return count, b.iterateExistingDBPaths(ctx, func(s string) (bool, error) {
+		shDB := b.getBlobovnicza(s)
+		blz, err := shDB.Open()
+		if err != nil {
+			return true, err
+		}
+		defer shDB.Close()
+
+		incompletedMoves, err := blz.ListMoveInfo(ctx)
+		if err != nil {
+			return true, err
+		}
+
+		for _, move := range incompletedMoves {
+			if err := b.performMove(ctx, blz, shDB.SystemPath(), move, metaStore); err != nil {
+				return true, err
+			}
+			count++
+		}
+
+		return false, nil
+	})
+}
+
+func (b *Blobovniczas) performMove(ctx context.Context, source *blobovnicza.Blobovnicza, sourcePath string,
+	move blobovnicza.MoveInfo, metaStore common.MetaStorage) error {
+	targetDB := b.getBlobovnicza(NewIDFromBytes(move.TargetStorageID).Path())
+	target, err := targetDB.Open()
+	if err != nil {
+		return err
+	}
+	defer targetDB.Close()
+
+	existsInSource := true
+	var gPrm blobovnicza.GetPrm
+	gPrm.SetAddress(move.Address)
+	gRes, err := source.Get(ctx, gPrm)
+	if err != nil {
+		if client.IsErrObjectNotFound(err) {
+			existsInSource = false
+		} else {
+			b.log.Warn(logs.BlobovniczatreeCouldNotCheckExistenceInTargetDB, zap.Error(err))
+			return err
+		}
+	}
+
+	if !existsInSource { //object was deleted by Rebuild, need to delete move info
+		if err = source.DropMoveInfo(ctx, move.Address); err != nil {
+			b.log.Warn(logs.BlobovniczatreeCouldNotDropMoveInfo, zap.String("path", sourcePath), zap.Error(err))
+			return err
+		}
+		b.deleteProtectedObjects.Delete(move.Address)
+		return nil
+	}
+
+	existsInTarget, err := target.Exists(ctx, move.Address)
+	if err != nil {
+		b.log.Warn(logs.BlobovniczatreeCouldNotCheckExistenceInTargetDB, zap.Error(err))
+		return err
+	}
+
+	if !existsInTarget {
+		var putPrm blobovnicza.PutPrm
+		putPrm.SetAddress(move.Address)
+		putPrm.SetMarshaledObject(gRes.Object())
+		_, err = target.Put(ctx, putPrm)
+		if err != nil {
+			b.log.Warn(logs.BlobovniczatreeCouldNotPutObjectToTargetDB, zap.String("path", targetDB.SystemPath()), zap.Error(err))
+			return err
+		}
+	}
+
+	if err = metaStore.UpdateStorageID(ctx, move.Address, move.TargetStorageID); err != nil {
+		b.log.Warn(logs.BlobovniczatreeCouldNotUpdateStorageID, zap.Error(err))
+		return err
+	}
+
+	var deletePrm blobovnicza.DeletePrm
+	deletePrm.SetAddress(move.Address)
+	if _, err = source.Delete(ctx, deletePrm); err != nil {
+		b.log.Warn(logs.BlobovniczatreeCouldNotDeleteFromSource, zap.String("path", sourcePath), zap.Error(err))
+		return err
+	}
+
+	if err = source.DropMoveInfo(ctx, move.Address); err != nil {
+		b.log.Warn(logs.BlobovniczatreeCouldNotDropMoveInfo, zap.String("path", sourcePath), zap.Error(err))
+		return err
+	}
+
+	b.deleteProtectedObjects.Delete(move.Address)
+	return nil
+}
+
+type moveIterator struct {
+	B             *Blobovniczas
+	ID            *ID
+	AllFull       bool
+	Address       oid.Address
+	ObjectData    []byte
+	MetaStore     common.MetaStorage
+	Source        *blobovnicza.Blobovnicza
+	SourceSysPath string
+}
+
+func (i *moveIterator) tryMoveToLvl(ctx context.Context, lvlPath string) (bool, error) {
+	target, err := i.B.activeDBManager.GetOpenedActiveDBForLevel(lvlPath)
+	if err != nil {
+		if !isLogical(err) {
+			i.B.reportError(logs.BlobovniczatreeCouldNotGetActiveBlobovnicza, err)
+		} else {
+			i.B.log.Warn(logs.BlobovniczatreeCouldNotGetActiveBlobovnicza, zap.Error(err))
+		}
+		return false, nil
+	}
+
+	if target == nil {
+		i.B.log.Warn(logs.BlobovniczatreeBlobovniczaOverflowed, zap.String("level", lvlPath))
+		return false, nil
+	}
+	defer target.Close()
+
+	i.AllFull = false
+
+	targetIDx := u64FromHexString(filepath.Base(target.SystemPath()))
+	targetStorageID := NewIDFromBytes([]byte(filepath.Join(lvlPath, u64ToHexString(targetIDx))))
+
+	if err = i.Source.PutMoveInfo(ctx, blobovnicza.MoveInfo{
+		Address:         i.Address,
+		TargetStorageID: targetStorageID.Bytes(),
+	}); err != nil {
+		if !isLogical(err) {
+			i.B.reportError(logs.BlobovniczatreeCouldNotPutMoveInfoToSourceBlobovnicza, err)
+		} else {
+			i.B.log.Warn(logs.BlobovniczatreeCouldNotPutMoveInfoToSourceBlobovnicza, zap.String("path", i.SourceSysPath), zap.Error(err))
+		}
+		return true, nil
+	}
+	i.B.deleteProtectedObjects.Add(i.Address)
+
+	var putPrm blobovnicza.PutPrm
+	putPrm.SetAddress(i.Address)
+	putPrm.SetMarshaledObject(i.ObjectData)
+
+	_, err = target.Blobovnicza().Put(ctx, putPrm)
+	if err != nil {
+		if !isLogical(err) {
+			i.B.reportError(logs.BlobovniczatreeCouldNotPutObjectToActiveBlobovnicza, err)
+		} else {
+			i.B.log.Warn(logs.BlobovniczatreeCouldNotPutObjectToActiveBlobovnicza, zap.String("path", target.SystemPath()), zap.Error(err))
+		}
+		return true, nil
+	}
+
+	if err = i.MetaStore.UpdateStorageID(ctx, i.Address, targetStorageID.Bytes()); err != nil {
+		i.B.log.Warn(logs.BlobovniczatreeCouldNotUpdateStorageID, zap.Error(err))
+		return true, nil
+	}
+
+	var deletePrm blobovnicza.DeletePrm
+	deletePrm.SetAddress(i.Address)
+	if _, err = i.Source.Delete(ctx, deletePrm); err != nil {
+		if !isLogical(err) {
+			i.B.reportError(logs.BlobovniczatreeCouldNotDeleteFromSource, err)
+		} else {
+			i.B.log.Warn(logs.BlobovniczatreeCouldNotDeleteFromSource, zap.String("path", i.SourceSysPath), zap.Error(err))
+		}
+		return true, nil
+	}
+
+	if err = i.Source.DropMoveInfo(ctx, i.Address); err != nil {
+		if !isLogical(err) {
+			i.B.reportError(logs.BlobovniczatreeCouldNotDropMoveInfo, err)
+		} else {
+			i.B.log.Warn(logs.BlobovniczatreeCouldNotDropMoveInfo, zap.String("path", i.SourceSysPath), zap.Error(err))
+		}
+		return true, nil
+	}
+	i.B.deleteProtectedObjects.Delete(i.Address)
+
+	i.ID = targetStorageID
+	return true, nil
+}
+
+type addressMap struct {
+	data  map[oid.Address]struct{}
+	guard *sync.RWMutex
+}
+
+func newAddressMap() *addressMap {
+	return &addressMap{
+		data:  make(map[oid.Address]struct{}),
+		guard: &sync.RWMutex{},
+	}
+}
+
+func (m *addressMap) Add(address oid.Address) {
+	m.guard.Lock()
+	defer m.guard.Unlock()
+
+	m.data[address] = struct{}{}
+}
+
+func (m *addressMap) Delete(address oid.Address) {
+	m.guard.Lock()
+	defer m.guard.Unlock()
+
+	delete(m.data, address)
+}
+
+func (m *addressMap) Contains(address oid.Address) bool {
+	m.guard.RLock()
+	defer m.guard.RUnlock()
+
+	_, contains := m.data[address]
+	return contains
+}

pkg/local_object_storage/blobstor/blobovniczatree/rebuild_failover_test.go

@@ -0,0 +1,192 @@
+package blobovniczatree
+
+import (
+	"bytes"
+	"context"
+	"path/filepath"
+	"testing"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/object"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobovnicza"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/internal/blobstortest"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/logger/test"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client"
+	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 TestRebuildFailover(t *testing.T) {
+	t.Parallel()
+
+	t.Run("only move info saved", testRebuildFailoverOnlyMoveInfoSaved)
+
+	t.Run("object saved to target", testRebuildFailoverObjectSavedToTarget)
+
+	t.Run("object deleted from source", testRebuildFailoverObjectDeletedFromSource)
+}
+
+func testRebuildFailoverOnlyMoveInfoSaved(t *testing.T) {
+	t.Parallel()
+	dir := t.TempDir()
+
+	blz := blobovnicza.New(blobovnicza.WithPath(filepath.Join(dir, "0", "0", "1.db")))
+	require.NoError(t, blz.Open())
+	require.NoError(t, blz.Init())
+
+	obj := blobstortest.NewObject(1024)
+	data, err := obj.Marshal()
+	require.NoError(t, err)
+
+	var pPrm blobovnicza.PutPrm
+	pPrm.SetAddress(object.AddressOf(obj))
+	pPrm.SetMarshaledObject(data)
+	_, err = blz.Put(context.Background(), pPrm)
+	require.NoError(t, err)
+
+	require.NoError(t, blz.PutMoveInfo(context.Background(), blobovnicza.MoveInfo{
+		Address:         object.AddressOf(obj),
+		TargetStorageID: []byte("0/0/0"),
+	}))
+
+	require.NoError(t, blz.Close())
+
+	testRebuildFailoverValidate(t, dir, obj, true)
+}
+
+func testRebuildFailoverObjectSavedToTarget(t *testing.T) {
+	t.Parallel()
+	dir := t.TempDir()
+
+	blz := blobovnicza.New(blobovnicza.WithPath(filepath.Join(dir, "0", "0", "1.db")))
+	require.NoError(t, blz.Open())
+	require.NoError(t, blz.Init())
+
+	obj := blobstortest.NewObject(1024)
+	data, err := obj.Marshal()
+	require.NoError(t, err)
+
+	var pPrm blobovnicza.PutPrm
+	pPrm.SetAddress(object.AddressOf(obj))
+	pPrm.SetMarshaledObject(data)
+	_, err = blz.Put(context.Background(), pPrm)
+	require.NoError(t, err)
+
+	require.NoError(t, blz.PutMoveInfo(context.Background(), blobovnicza.MoveInfo{
+		Address:         object.AddressOf(obj),
+		TargetStorageID: []byte("0/0/0"),
+	}))
+
+	require.NoError(t, blz.Close())
+
+	blz = blobovnicza.New(blobovnicza.WithPath(filepath.Join(dir, "0", "0", "0.db")))
+	require.NoError(t, blz.Open())
+	require.NoError(t, blz.Init())
+
+	_, err = blz.Put(context.Background(), pPrm)
+	require.NoError(t, err)
+
+	require.NoError(t, blz.Close())
+
+	testRebuildFailoverValidate(t, dir, obj, true)
+}
+
+func testRebuildFailoverObjectDeletedFromSource(t *testing.T) {
+	t.Parallel()
+	dir := t.TempDir()
+
+	blz := blobovnicza.New(blobovnicza.WithPath(filepath.Join(dir, "0", "0", "1.db")))
+	require.NoError(t, blz.Open())
+	require.NoError(t, blz.Init())
+
+	obj := blobstortest.NewObject(1024)
+	data, err := obj.Marshal()
+	require.NoError(t, err)
+
+	require.NoError(t, blz.PutMoveInfo(context.Background(), blobovnicza.MoveInfo{
+		Address:         object.AddressOf(obj),
+		TargetStorageID: []byte("0/0/0"),
+	}))
+
+	require.NoError(t, blz.Close())
+
+	blz = blobovnicza.New(blobovnicza.WithPath(filepath.Join(dir, "0", "0", "0.db")))
+	require.NoError(t, blz.Open())
+	require.NoError(t, blz.Init())
+
+	var pPrm blobovnicza.PutPrm
+	pPrm.SetAddress(object.AddressOf(obj))
+	pPrm.SetMarshaledObject(data)
+	_, err = blz.Put(context.Background(), pPrm)
+	require.NoError(t, err)
+
+	require.NoError(t, blz.Close())
+
+	testRebuildFailoverValidate(t, dir, obj, false)
+}
+
+func testRebuildFailoverValidate(t *testing.T, dir string, obj *objectSDK.Object, mustUpdateStorageID bool) {
+	b := NewBlobovniczaTree(
+		WithLogger(test.NewLogger(t, true)),
+		WithObjectSizeLimit(2048),
+		WithBlobovniczaShallowWidth(2),
+		WithBlobovniczaShallowDepth(2),
+		WithRootPath(dir),
+		WithBlobovniczaSize(100*1024*1024),
+		WithWaitBeforeDropDB(0),
+		WithOpenedCacheSize(1000))
+	require.NoError(t, b.Open(false))
+	require.NoError(t, b.Init())
+
+	var dPrm common.DeletePrm
+	dPrm.Address = object.AddressOf(obj)
+	dPrm.StorageID = []byte("0/0/1")
+	_, err := b.Delete(context.Background(), dPrm)
+	require.ErrorIs(t, err, errObjectIsDeleteProtected)
+
+	metaStub := &storageIDUpdateStub{
+		storageIDs: make(map[oid.Address][]byte),
+	}
+	rRes, err := b.Rebuild(context.Background(), common.RebuildPrm{
+		MetaStorage: metaStub,
+	})
+	require.NoError(t, err)
+	require.Equal(t, uint64(1), rRes.ObjectsMoved)
+	require.Equal(t, uint64(0), rRes.FilesRemoved)
+
+	require.NoError(t, b.Close())
+
+	blz := blobovnicza.New(blobovnicza.WithPath(filepath.Join(dir, "0", "0", "1.db")))
+	require.NoError(t, blz.Open())
+	require.NoError(t, blz.Init())
+
+	moveInfo, err := blz.ListMoveInfo(context.Background())
+	require.NoError(t, err)
+	require.Equal(t, 0, len(moveInfo))
+
+	var gPrm blobovnicza.GetPrm
+	gPrm.SetAddress(object.AddressOf(obj))
+	_, err = blz.Get(context.Background(), gPrm)
+	require.True(t, client.IsErrObjectNotFound(err))
+
+	require.NoError(t, blz.Close())
+
+	blz = blobovnicza.New(blobovnicza.WithPath(filepath.Join(dir, "0", "0", "0.db")))
+	require.NoError(t, blz.Open())
+	require.NoError(t, blz.Init())
+
+	moveInfo, err = blz.ListMoveInfo(context.Background())
+	require.NoError(t, err)
+	require.Equal(t, 0, len(moveInfo))
+
+	gRes, err := blz.Get(context.Background(), gPrm)
+	require.NoError(t, err)
+	require.True(t, len(gRes.Object()) > 0)
+
+	if mustUpdateStorageID {
+		require.True(t, bytes.Equal([]byte("0/0/0"), metaStub.storageIDs[object.AddressOf(obj)]))
+	}
+
+	require.NoError(t, blz.Close())
+}