[#964] metabase: Drop GC marks if object not found

GC inhumes expired locks and tombstones on all the shards.
So it could be GC mark without object.

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

pkg/local_object_storage/metabase/delete.go

@@ -254,9 +254,18 @@ func (db *DB) delete(tx *bbolt.Tx, addr oid.Address, refCounter referenceCounter
 	// unmarshal object, work only with physically stored (raw == true) objects
 	obj, err := db.get(tx, addr, key, false, true, currEpoch)
 	if err != nil {
+		if client.IsErrObjectNotFound(err) {
+			addrKey = addressKey(addr, key)
+			if garbageBKT != nil {
+				err := garbageBKT.Delete(addrKey)
+				if err != nil {
+					return deleteSingleResult{}, fmt.Errorf("could not remove from garbage bucket: %w", err)
+				}
+			}
+			return deleteSingleResult{}, nil
+		}
 		var siErr *objectSDK.SplitInfoError
-
-		if client.IsErrObjectNotFound(err) || errors.As(err, &siErr) {
+		if errors.As(err, &siErr) {
 			// if object is virtual (parent) then do nothing, it will be deleted with last child
 			return deleteSingleResult{}, nil
 		}

pkg/local_object_storage/metabase/delete_test.go

@@ -182,6 +182,37 @@ func TestDelete(t *testing.T) {
 	require.Equal(t, 0, len(addrs))
 }
 
+func TestDeleteDropsGCMarkIfObjectNotFound(t *testing.T) {
+	db := newDB(t, meta.WithEpochState(epochState{currEpoch}))
+	defer func() { require.NoError(t, db.Close()) }()
+
+	addr := oidtest.Address()
+
+	var prm meta.InhumePrm
+	prm.SetAddresses(addr)
+	prm.SetGCMark()
+	_, err := db.Inhume(context.Background(), prm)
+	require.NoError(t, err)
+
+	var garbageCount int
+	var itPrm meta.GarbageIterationPrm
+	itPrm.SetHandler(func(g meta.GarbageObject) error {
+		garbageCount++
+		return nil
+	})
+	require.NoError(t, db.IterateOverGarbage(context.Background(), itPrm))
+	require.Equal(t, 1, garbageCount)
+
+	var delPrm meta.DeletePrm
+	delPrm.SetAddresses(addr)
+	_, err = db.Delete(context.Background(), delPrm)
+	require.NoError(t, err)
+
+	garbageCount = 0
+	require.NoError(t, db.IterateOverGarbage(context.Background(), itPrm))
+	require.Equal(t, 0, garbageCount)
+}
+
 func metaDelete(db *meta.DB, addrs ...oid.Address) error {
 	var deletePrm meta.DeletePrm
 	deletePrm.SetAddresses(addrs...)