def _update_configs(self):
    self._lock.acquire()
    try:
      if self._initialized:
        self._clear_cache()
      self._registry.initialize()
      for key, value in self._registry._pairs(self._prefix):
        if key not in self._defaults:
          logging.warn('Configuration "%s" not recognized', self._prefix + key)
        else:
          self._overrides[key] = value
      self._initialized = True
    finally:
      self._lock.release()
Update the configuration values.
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/api/lib_config.py/ConfigHandle._update_configs