mu.Lock()
			defer mu.Unlock()
			for i, obj := range group {
				delErrs[obj.origIndex] = errs[i]
				delObjects[obj.origIndex] = dobjects[i]
			}
		}(s.sets[setIdx], objsGroup)
	}
	wg.Wait()

	return delObjects, delErrs
}

// CopyObject - copies objects from one hashedSet to another hashedSet, on server side.