class_docstr: A ``RequestQueue`` backed by python ``multiprocessing.Queue``
code: def size(self) -> int:
      return self._mp_queue.qsize()
  
imports: import logging
  import multiprocessing
  import os
  import signal
  import time
  from queue import Empty
  from typing import Any, Dict, List, Set, Tuple
  from .api import RequestQueue, TimerClient, TimerRequest, TimerServer
label_desc: Use image node_id 2 for calling the MultiprocessingRequestQueue obj's underlying member method code with example usage: obj.size() and returns: self