@ConfigSync(shared=1)
  def GetMasterNode(self):
    return self._ConfigData().cluster.master_node
Idea from Software Estimation, Demystifying the Black Art, McConnel 2006 Fig 3-3.
dataset/ETHPy150Open ganeti/ganeti/lib/config/__init__.py/ConfigWriter.GetMasterNode--crossover with--dataset/ETHPy150Open caktus/django-timepiece/timepiece/reports/views.py/report_estimation_accuracy