@Override
  public <C1 extends DurableMap<K, Set<VItem>>> @NotNull C1 compact(@NotNull ThrowableComputable<C1, ? extends IOException> compactedMapFactory)
    throws IOException {
    //TODO please, implement me
    throw new UnsupportedOperationException("Method is not implemented yet");
  }
@Override
  public <C1 extends DurableMap<K, Set<VItem>>> @NotNull C1 compact(@NotNull ThrowableComputable<C1, ? extends IOException> compactedMapFactory)