[#1356] engine: Evacuate object from shards concurrently

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

cmd/frostfs-node/config.go

@@ -110,6 +110,11 @@ type applicationConfiguration struct {
 		shardPoolSize  uint32
 		shards         []shardCfg
 		lowMem         bool
+
+		evacuationShardWorkerCount     uint32
+		evacuationObjectWorkerCount    uint32
+		evacuationContainerWorkerCount uint32
+		evacuationObjectBatchSize      uint32
 	}
 
 	// if need to run node in compatibility with other versions mode
@@ -228,6 +233,10 @@ func (a *applicationConfiguration) readConfig(c *config.Config) error {
 	a.EngineCfg.errorThreshold = engineconfig.ShardErrorThreshold(c)
 	a.EngineCfg.shardPoolSize = engineconfig.ShardPoolSize(c)
 	a.EngineCfg.lowMem = engineconfig.EngineLowMemoryConsumption(c)
+	a.EngineCfg.evacuationShardWorkerCount = engineconfig.EngineEvacuationShardWorkerCount(c)
+	a.EngineCfg.evacuationObjectWorkerCount = engineconfig.EngineEvacuationObjectWorkerCount(c)
+	a.EngineCfg.evacuationObjectBatchSize = engineconfig.EngineEvacuationObjectBatchSize(c)
+	a.EngineCfg.evacuationContainerWorkerCount = engineconfig.EngineEvacuationContainerWorkerCount(c)
 
 	return engineconfig.IterateShards(c, false, func(sc *shardconfig.Config) error { return a.updateShardConfig(c, sc) })
 }
@@ -829,6 +838,10 @@ func (c *cfg) engineOpts() []engine.Option {
 		engine.WithErrorThreshold(c.EngineCfg.errorThreshold),
 		engine.WithLogger(c.log),
 		engine.WithLowMemoryConsumption(c.EngineCfg.lowMem),
+		engine.WithEvacuationShardWorkerCount(c.EngineCfg.evacuationShardWorkerCount),
+		engine.WithEvacuationObjectWorkerCount(c.EngineCfg.evacuationObjectWorkerCount),
+		engine.WithEvacuationObjectBatchSize(c.EngineCfg.evacuationObjectBatchSize),
+		engine.WithEvacuationContainerWorkerCount(c.EngineCfg.evacuationContainerWorkerCount),
 	)
 
 	if c.metricsCollector != nil {

cmd/frostfs-node/config/engine/config.go

@@ -15,6 +15,18 @@ const (
 	// ShardPoolSizeDefault is a default value of routine pool size per-shard to
 	// process object PUT operations in a storage engine.
 	ShardPoolSizeDefault = 20
+	// EvacuationShardWorkerCountDefault is a default value of the count of shards
+	// evacuees concurrently.
+	EvacuationShardWorkerCountDefault = 5
+	// EvacuationContainerWorkerCountDefault is a default value of the count of
+	// concurrent container evacuation workers per shard.
+	EvacuationContainerWorkerCountDefault = 10
+	// EvacuationObjectWorkerCountDefault is a default value of the count of
+	// concurrent object evacuation workers for each container.
+	EvacuationObjectWorkerCountDefault = 10
+	// EvacuationObjectBatchSizeDefault is a default value of the count of
+	// objects reading from metabase.
+	EvacuationObjectBatchSizeDefault = 100
 )
 
 // ErrNoShardConfigured is returned when at least 1 shard is required but none are found.
@@ -88,3 +100,35 @@ func ShardErrorThreshold(c *config.Config) uint32 {
 func EngineLowMemoryConsumption(c *config.Config) bool {
 	return config.BoolSafe(c.Sub(subsection), "low_mem")
 }
+
+// EngineEvacuationShardWorkerCount returns value of "evacuation_shard_worker_count" config parameter from "storage" section.
+func EngineEvacuationShardWorkerCount(c *config.Config) uint32 {
+	if v := config.Uint32Safe(c.Sub(subsection), "evacuation_shard_worker_count"); v > 0 {
+		return v
+	}
+	return EvacuationShardWorkerCountDefault
+}
+
+// EngineEvacuationObjectWorkerCount returns value of "evacuation_object_worker_count" config parameter from "storage" section.
+func EngineEvacuationObjectWorkerCount(c *config.Config) uint32 {
+	if v := config.Uint32Safe(c.Sub(subsection), "evacuation_object_worker_count"); v > 0 {
+		return v
+	}
+	return EvacuationObjectWorkerCountDefault
+}
+
+// EngineEvacuationContainerWorkerCount returns value of "evacuation_container_worker_count" config parameter from "storage" section.
+func EngineEvacuationContainerWorkerCount(c *config.Config) uint32 {
+	if v := config.Uint32Safe(c.Sub(subsection), "evacuation_container_worker_count"); v > 0 {
+		return v
+	}
+	return EvacuationContainerWorkerCountDefault
+}
+
+// EngineEvacuationObjectBatchSize returns value of "evacuation_object_batch_size" config parameter from "storage" section.
+func EngineEvacuationObjectBatchSize(c *config.Config) uint32 {
+	if v := config.Uint32Safe(c.Sub(subsection), "evacuation_object_batch_size"); v > 0 {
+		return v
+	}
+	return EvacuationObjectBatchSizeDefault
+}

config/example/node.env

@@ -91,6 +91,10 @@ FROSTFS_OBJECT_DELETE_TOMBSTONE_LIFETIME=10
 # Storage engine section
 FROSTFS_STORAGE_SHARD_POOL_SIZE=15
 FROSTFS_STORAGE_SHARD_RO_ERROR_THRESHOLD=100
+EVACUATION_SHARD_WORKER_COUNT=5
+EVACUATION_OBJECT_WORKER_COUNT=10
+EVACUATION_CONTAINER_WORKER_COUNT=10
+EVACUATION_OBJECT_BATCH_SIZE=100
 ## 0 shard
 ### Flag to refill Metabase from BlobStor
 FROSTFS_STORAGE_SHARD_0_RESYNC_METABASE=false

config/example/node.json

@@ -136,6 +136,10 @@
   "storage": {
     "shard_pool_size": 15,
     "shard_ro_error_threshold": 100,
+    "evacuation_object_batch_size": 100,
+    "evacuation_container_worker_count": 10,
+    "evacuation_object_worker_count": 10,
+    "evacuation_shard_worker_count": 5,
     "shard": {
       "0": {
         "mode": "read-only",

config/example/node.yaml

@@ -118,6 +118,10 @@ storage:
   # note: shard configuration can be omitted for relay node (see `node.relay`)
   shard_pool_size: 15 # size of per-shard worker pools used for PUT operations
   shard_ro_error_threshold: 100 # amount of errors to occur before shard is made read-only (default: 0, ignore errors)
+  evacuation_object_batch_size: 100 # amount of objects reading from metabase at once for evacuation
+  evacuation_container_worker_count: 10 # the count of the concurrent container evacuation workers for each shard
+  evacuation_object_worker_count: 10 # the count of the concurrent object evacuation workers per container
+  evacuation_shard_worker_count: 5 # amount of shards evacuees concurrently
 
   shard:
     default: # section with the default shard parameters

docs/storage-node-configuration.md

@@ -167,12 +167,16 @@ morph:
 
 Local storage engine configuration.
 
-| Parameter                  | Type                              | Default value | Description                                                                                                      |
+| Parameter                           | Type                              | Default value | Description                                                                                                      |
-|----------------------------|-----------------------------------|---------------|------------------------------------------------------------------------------------------------------------------|
+|-------------------------------------|-----------------------------------|---------------|------------------------------------------------------------------------------------------------------------------|
-| `shard_pool_size`          | `int`                             | `20`          | Pool size for shard workers. Limits the amount of concurrent `PUT` operations on each shard.                     |
+| `shard_pool_size`                   | `int`                             | `20`          | Pool size for shard workers. Limits the amount of concurrent `PUT` operations on each shard.                     |
-| `shard_ro_error_threshold` | `int`                             | `0`           | Maximum amount of storage errors to encounter before shard automatically moves to `Degraded` or `ReadOnly` mode. |
+| `shard_ro_error_threshold`          | `int`                             | `0`           | Maximum amount of storage errors to encounter before shard automatically moves to `Degraded` or `ReadOnly` mode. |
-| `low_mem`                  | `bool`                            | `false`       | Reduce memory consumption by reducing performance.                                                               |
+| `evacuation_object_batch_size`      | `int`                             | `100`         | Amount of objects reading from metabase at once for evacuation.                                                  |
-| `shard`                    | [Shard config](#shard-subsection) |               | Configuration for separate shards.                                                                               |
+| `evacuation_container_worker_count` | `int`                             | `10`          | The count of the concurrent container evacuation workers for each shard.                                         |
+| `evacuation_object_worker_count`    | `int`                             | `10`          | The count of the concurrent object evacuation workers per container.                                             |
+| `evacuation_shard_worker_count`     | `int`                             | `5`           | Amount of shards evacuees concurrently.                                                                          |
+| `low_mem`                           | `bool`                            | `false`       | Reduce memory consumption by reducing performance.                                                               |
+| `shard`                             | [Shard config](#shard-subsection) |               | Configuration for separate shards.                                                                               |
 
 ## `shard` subsection
 

pkg/local_object_storage/engine/engine.go

@@ -213,12 +213,22 @@ type cfg struct {
 	lowMem bool
 
 	containerSource atomic.Pointer[containerSource]
+
+	evacuationShardWorkerCount     uint32
+	evacuationObjectWorkerCount    uint32
+	evacuationObjectBatchSize      uint32
+	evacuationContainerWorkerCount uint32
 }
 
 func defaultCfg() *cfg {
 	res := &cfg{
 		log:           &logger.Logger{Logger: zap.L()},
 		shardPoolSize: 20,
+
+		evacuationShardWorkerCount:     5,
+		evacuationObjectWorkerCount:    10,
+		evacuationObjectBatchSize:      100,
+		evacuationContainerWorkerCount: 10,
 	}
 	res.containerSource.Store(&containerSource{})
 	return res
@@ -277,6 +287,34 @@ func WithLowMemoryConsumption(lowMemCons bool) Option {
 	}
 }
 
+// WithEvacuationShardWorkerCount returns an option to set the count of shards evacuees concurrently.
+func WithEvacuationShardWorkerCount(count uint32) Option {
+	return func(c *cfg) {
+		c.evacuationShardWorkerCount = count
+	}
+}
+
+// WithEvacuationObjectWorkerCount returns an option to set the count of the concurrent object evacuation workers per container.
+func WithEvacuationObjectWorkerCount(count uint32) Option {
+	return func(c *cfg) {
+		c.evacuationObjectWorkerCount = count
+	}
+}
+
+// WithEvacuationObjectBatchSize returns an option to set the count of object reading from metabase.
+func WithEvacuationObjectBatchSize(count uint32) Option {
+	return func(c *cfg) {
+		c.evacuationObjectBatchSize = count
+	}
+}
+
+// WithEvacuationContainerWorkerCount returns an option to set the count of the concurrent container evacuation workers for each shard.
+func WithEvacuationContainerWorkerCount(count uint32) Option {
+	return func(c *cfg) {
+		c.evacuationContainerWorkerCount = count
+	}
+}
+
 // SetContainerSource sets container source.
 func (e *StorageEngine) SetContainerSource(cs container.Source) {
 	e.containerSource.Store(&containerSource{cs: cs})

pkg/local_object_storage/engine/evacuate.go

@@ -10,7 +10,6 @@ import (
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/object"
-	meta "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/metabase"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/pilorama"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/util/logicerr"
@@ -24,6 +23,7 @@ import (
 	"go.opentelemetry.io/otel/attribute"
 	"go.opentelemetry.io/otel/trace"
 	"go.uber.org/zap"
+	"golang.org/x/sync/errgroup"
 )
 
 var (
@@ -189,8 +189,6 @@ func (p *EvacuateShardRes) DeepCopy() *EvacuateShardRes {
 	return res
 }
 
-const defaultEvacuateBatchSize = 100
-
 type pooledShard struct {
 	hashedShard
 	pool util.WorkerPool
@@ -287,12 +285,21 @@ func (e *StorageEngine) evacuateShards(ctx context.Context, shardIDs []string, p
 		return err
 	}
 
+	eg, egCtx := errgroup.WithContext(ctx)
+	eg.SetLimit(int(e.cfg.evacuationShardWorkerCount))
 	for _, shardID := range shardIDs {
-		if err = e.evacuateShard(ctx, shardID, prm, res, shards, shardsToEvacuate); err != nil {
+		eg.Go(func() error {
-			e.log.Error(logs.EngineFinishedWithErrorShardsEvacuation, zap.Error(err), zap.Strings("shard_ids", shardIDs), evacuationOperationLogField,
+			if err = e.evacuateShard(egCtx, shardID, prm, res, shards, shardsToEvacuate); err != nil {
-				zap.String("trace_id", tracingPkg.GetTraceID(ctx)), zap.Stringer("scope", prm.Scope))
+				e.log.Error(logs.EngineFinishedWithErrorShardsEvacuation, zap.Error(err), zap.Strings("shard_ids", shardIDs), evacuationOperationLogField,
-			return err
+					zap.String("trace_id", tracingPkg.GetTraceID(ctx)), zap.Stringer("scope", prm.Scope))
-		}
+				return err
+			}
+			return nil
+		})
+	}
+	err = eg.Wait()
+	if err != nil {
+		return err
 	}
 
 	e.log.Info(logs.EngineFinishedSuccessfullyShardsEvacuation,
@@ -344,53 +351,41 @@ func (e *StorageEngine) evacuateShard(ctx context.Context, shardID string, prm E
 		))
 	defer span.End()
 
+	eg, egCtx := errgroup.WithContext(ctx)
 	if prm.Scope.WithObjects() {
-		if err := e.evacuateShardObjects(ctx, shardID, prm, res, shards, shardsToEvacuate); err != nil {
+		eg.Go(func() error {
-			return err
+			return e.evacuateShardObjects(egCtx, shardID, prm, res, shards, shardsToEvacuate)
-		}
+		})
 	}
-
 	if prm.Scope.WithTrees() && shardsToEvacuate[shardID].PiloramaEnabled() {
-		if err := e.evacuateShardTrees(ctx, shardID, prm, res, shards, shardsToEvacuate); err != nil {
+		eg.Go(func() error {
-			return err
+			return e.evacuateShardTrees(egCtx, shardID, prm, res, shards, shardsToEvacuate)
-		}
+		})
 	}
 
-	return nil
+	return eg.Wait()
 }
 
 func (e *StorageEngine) evacuateShardObjects(ctx context.Context, shardID string, prm EvacuateShardPrm, res *EvacuateShardRes,
 	shards []pooledShard, shardsToEvacuate map[string]*shard.Shard,
 ) error {
-	var listPrm shard.ListWithCursorPrm
-	listPrm.WithCount(defaultEvacuateBatchSize)
-
 	sh := shardsToEvacuate[shardID]
 	sh.SetEvacuationInProgress(true)
 
-	var c *meta.Cursor
+	var listPrm shard.ListConcurrentlyPrm
-	for {
+	listPrm.BatchSize = e.cfg.evacuationObjectBatchSize
-		listPrm.WithCursor(c)
+	listPrm.Handler = func(ctx context.Context, addrList []object.Info) error {
-
+		return e.evacuateObjects(ctx, sh, addrList, prm, res, shards, shardsToEvacuate)
-		// TODO (@fyrchik): #1731 this approach doesn't work in degraded modes
-		//  because ListWithCursor works only with the metabase.
-		listRes, err := sh.ListWithCursor(ctx, listPrm)
-		if err != nil {
-			if errors.Is(err, meta.ErrEndOfListing) || errors.Is(err, shard.ErrDegradedMode) {
-				break
-			}
-			e.log.Error(logs.EngineShardsEvacuationFailedToListObjects, zap.String("shard_id", shardID), zap.Error(err), evacuationOperationLogField,
-				zap.String("trace_id", tracingPkg.GetTraceID(ctx)))
-			return err
-		}
-
-		if err = e.evacuateObjects(ctx, sh, listRes.AddressList(), prm, res, shards, shardsToEvacuate); err != nil {
-			return err
-		}
-
-		c = listRes.Cursor()
 	}
-	return nil
+	listPrm.ObjectWorkerCount = e.cfg.evacuationObjectWorkerCount
+	listPrm.ContainerWorkerCount = e.cfg.evacuationContainerWorkerCount
+
+	err := sh.ListConcurrently(ctx, listPrm)
+	if err != nil {
+		e.log.Error(logs.EngineShardsEvacuationFailedToListObjects, zap.String("shard_id", shardID), zap.Error(err), evacuationOperationLogField,
+			zap.String("trace_id", tracingPkg.GetTraceID(ctx)))
+	}
+	return err
 }
 
 func (e *StorageEngine) evacuateShardTrees(ctx context.Context, shardID string, prm EvacuateShardPrm, res *EvacuateShardRes,

pkg/local_object_storage/engine/evacuate_test.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"path/filepath"
 	"strconv"
+	"sync/atomic"
 	"testing"
 	"time"
 
@@ -29,7 +30,9 @@ import (
 func newEngineEvacuate(t *testing.T, shardNum int, objPerShard int) (*StorageEngine, []*shard.ID, []*objectSDK.Object) {
 	dir := t.TempDir()
 
-	te := testNewEngine(t).
+	te := testNewEngine(t,
+		WithEvacuationObjectBatchSize(1), WithEvacuationShardWorkerCount(2),
+		WithEvacuationContainerWorkerCount(2), WithEvacuationObjectWorkerCount(2)).
 		setShardsNumOpts(t, shardNum, func(id int) []shard.Option {
 			return []shard.Option{
 				shard.WithLogger(test.NewLogger(t)),
@@ -174,13 +177,13 @@ func TestEvacuateObjectsNetwork(t *testing.T) {
 	errReplication := errors.New("handler error")
 
 	acceptOneOf := func(objects []*objectSDK.Object, max uint64) func(context.Context, oid.Address, *objectSDK.Object) (bool, error) {
-		var n uint64
+		var n atomic.Uint64
 		return func(_ context.Context, addr oid.Address, obj *objectSDK.Object) (bool, error) {
-			if n == max {
+			if n.Load() == max {
 				return false, errReplication
 			}
 
-			n++
+			n.Add(1)
 			for i := range objects {
 				if addr == objectCore.AddressOf(objects[i]) {
 					require.Equal(t, objects[i], obj)

pkg/local_object_storage/metabase/list.go

@@ -14,6 +14,7 @@ import (
 	"go.etcd.io/bbolt"
 	"go.opentelemetry.io/otel/attribute"
 	"go.opentelemetry.io/otel/trace"
+	"golang.org/x/sync/errgroup"
 )
 
 // ErrEndOfListing is returned from object listing with cursor
@@ -61,6 +62,18 @@ func (l ListRes) Cursor() *Cursor {
 	return l.cursor
 }
 
+// ListConcurrentlyPrm contains parameters for ListWithCursor operation.
+type ListConcurrentlyPrm struct {
+	// Handler concurrently executed upon objects in db.
+	Handler func(context.Context, []objectcore.Info) error
+	// BatchSize maximum amount of addresses that will be passed to Handler.
+	BatchSize uint32
+	// ContainerWorkerCount amount of containers computed concurrently.
+	ContainerWorkerCount uint32
+	// ObjectWorkerCount amount of workers runs Handler concurrently for each container.
+	ObjectWorkerCount uint32
+}
+
 // ListWithCursor lists physical objects available in metabase starting from
 // cursor. Includes objects of all types. Does not include inhumed objects.
 // Use cursor value from response for consecutive requests.
@@ -259,3 +272,149 @@ func parseContainerIDWithPrefix(containerID *cid.ID, name []byte) ([]byte, byte)
 
 	return rawID, name[0]
 }
+
+// ListConcurrently lists physical objects available in metabase starting from first.
+// Includes objects of all types. Does not include inhumed objects.
+func (db *DB) ListConcurrently(ctx context.Context, prm ListConcurrentlyPrm) error {
+	var (
+		startedAt = time.Now()
+		success   = false
+	)
+	defer func() {
+		db.metrics.AddMethodDuration("ListConcurrently", time.Since(startedAt), success)
+	}()
+	_, span := tracing.StartSpanFromContext(ctx, "metabase.ListConcurrently",
+		trace.WithAttributes(
+			attribute.Int("batch_size", int(prm.BatchSize)),
+			attribute.Bool("has_handler", prm.Handler != nil),
+			attribute.Int("object_worker_count", int(prm.ObjectWorkerCount)),
+			attribute.Int("container_worker_count", int(prm.ContainerWorkerCount)),
+		))
+	defer span.End()
+
+	db.modeMtx.RLock()
+	defer db.modeMtx.RUnlock()
+
+	if db.mode.NoMetabase() {
+		return ErrDegradedMode
+	}
+
+	err := db.boltDB.View(func(tx *bbolt.Tx) error {
+		return db.listConcurrently(ctx, tx, prm)
+	})
+	success = err == nil
+	return metaerr.Wrap(err)
+}
+
+func (db *DB) listConcurrently(ctx context.Context, tx *bbolt.Tx, prm ListConcurrentlyPrm) error {
+	c := tx.Cursor()
+	name, _ := c.First()
+
+	var containerID cid.ID
+	graveyardBkt := tx.Bucket(graveyardBucketName)
+	garbageBkt := tx.Bucket(garbageBucketName)
+
+	eg, egCtx := errgroup.WithContext(ctx)
+	eg.SetLimit(int(prm.ContainerWorkerCount))
+
+	for ; name != nil; name, _ = c.Next() {
+		cidRaw, prefix := parseContainerIDWithPrefix(&containerID, name)
+		if cidRaw == nil {
+			continue
+		}
+
+		var objType objectSDK.Type
+
+		switch prefix {
+		case primaryPrefix:
+			objType = objectSDK.TypeRegular
+		case lockersPrefix:
+			objType = objectSDK.TypeLock
+		case tombstonePrefix:
+			objType = objectSDK.TypeTombstone
+		default:
+			continue
+		}
+
+		bkt := tx.Bucket(name)
+		if bkt != nil {
+			rawAddr := make([]byte, cidSize, addressKeySize)
+			copy(rawAddr, cidRaw)
+			var cnt cid.ID
+			copy(cnt[:], containerID[:])
+			eg.Go(func() error {
+				return selectConcurrentlyFromBucket(egCtx,
+					bkt, objType, graveyardBkt, garbageBkt, rawAddr, cnt, prm)
+			})
+		}
+	}
+
+	return eg.Wait()
+}
+
+// selectConcurrentlyFromBucket similar to selectAllFromBucket but process selected objects concurrently.
+// Ignores inhumed objects.
+func selectConcurrentlyFromBucket(ctx context.Context,
+	bkt *bbolt.Bucket, // main bucket
+	objType objectSDK.Type, // type of the objects stored in the main bucket
+	graveyardBkt, garbageBkt *bbolt.Bucket, // cached graveyard buckets
+	cidRaw []byte, // container ID prefix, optimization
+	cnt cid.ID, // container ID
+	prm ListConcurrentlyPrm,
+) error {
+	c := bkt.Cursor()
+	k, v := c.First()
+	batch := make([]objectcore.Info, 0, prm.BatchSize)
+
+	eg, egCtx := errgroup.WithContext(ctx)
+	eg.SetLimit(int(prm.ObjectWorkerCount))
+
+	for ; k != nil; k, v = c.Next() {
+		var obj oid.ID
+		if err := obj.Decode(k); err != nil {
+			break
+		}
+
+		if inGraveyardWithKey(append(cidRaw, k...), graveyardBkt, garbageBkt) > 0 {
+			continue
+		}
+
+		var isLinkingObj bool
+		var ecInfo *objectcore.ECInfo
+		if objType == objectSDK.TypeRegular {
+			var o objectSDK.Object
+			if err := o.Unmarshal(v); err != nil {
+				return err
+			}
+			isLinkingObj = isLinkObject(&o)
+			ecHeader := o.ECHeader()
+			if ecHeader != nil {
+				ecInfo = &objectcore.ECInfo{
+					ParentID: ecHeader.Parent(),
+					Index:    ecHeader.Index(),
+					Total:    ecHeader.Total(),
+				}
+			}
+		}
+
+		var a oid.Address
+		a.SetContainer(cnt)
+		a.SetObject(obj)
+		batch = append(batch, objectcore.Info{Address: a, Type: objType, IsLinkingObject: isLinkingObj, ECInfo: ecInfo})
+		if len(batch) >= int(prm.BatchSize) {
+			addrs := make([]objectcore.Info, 0, len(batch))
+			addrs = append(addrs, batch...)
+			eg.Go(func() error {
+				return prm.Handler(egCtx, addrs)
+			})
+			batch = batch[:0]
+		}
+	}
+	if len(batch) > 0 {
+		eg.Go(func() error {
+			return prm.Handler(egCtx, batch)
+		})
+	}
+
+	return eg.Wait()
+}

pkg/local_object_storage/shard/list.go

@@ -34,6 +34,18 @@ func (r ListContainersRes) Containers() []cid.ID {
 	return r.containers
 }
 
+// ListConcurrentlyPrm contains parameters for ListWithCursor operation.
+type ListConcurrentlyPrm struct {
+	// Handler concurrently executed upon objects in db.
+	Handler func(context.Context, []objectcore.Info) error
+	// BatchSize maximum amount of addresses that will be passed to Handler.
+	BatchSize uint32
+	// ContainerWorkerCount amount of containers computed concurrently.
+	ContainerWorkerCount uint32
+	// ObjectWorkerCount amount of workers runs Handler concurrently
+	ObjectWorkerCount uint32
+}
+
 // ListWithCursorPrm contains parameters for ListWithCursor operation.
 type ListWithCursorPrm struct {
 	count  uint32
@@ -164,3 +176,32 @@ func (s *Shard) ListWithCursor(ctx context.Context, prm ListWithCursorPrm) (List
 		cursor:   res.Cursor(),
 	}, nil
 }
+
+// ListConcurrently lists physical objects available in shard starting from first.
+// Includes regular, tombstone and storage group objects. Does not include inhumed objects.
+func (s *Shard) ListConcurrently(ctx context.Context, prm ListConcurrentlyPrm) error {
+	_, span := tracing.StartSpanFromContext(ctx, "shard.ListConcurrently",
+		trace.WithAttributes(
+			attribute.Int64("batch_size", int64(prm.BatchSize)),
+			attribute.Bool("has_handler", prm.Handler != nil),
+			attribute.Int("object_worker_count", int(prm.ObjectWorkerCount)),
+			attribute.Int("container_worker_count", int(prm.ContainerWorkerCount)),
+		))
+	defer span.End()
+
+	if s.GetMode().NoMetabase() {
+		return ErrDegradedMode
+	}
+
+	var metaPrm meta.ListConcurrentlyPrm
+	metaPrm.BatchSize = prm.BatchSize
+	metaPrm.Handler = prm.Handler
+	metaPrm.ContainerWorkerCount = prm.ContainerWorkerCount
+	metaPrm.ObjectWorkerCount = prm.ObjectWorkerCount
+	err := s.metaBase.ListConcurrently(ctx, metaPrm)
+	if err != nil {
+		return fmt.Errorf("could not list objects concurrently: %w", err)
+	}
+
+	return nil
+}