def is_app_running(self, app_id):
    return self.call(self.MAX_RETRIES, self.server.is_app_running, app_id,
      self.secret)
returns a list of nodes.
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/api/appcontroller_client.py/AppControllerClient.is_app_running--crossover with--dataset/ETHPy150Open manahl/mdf/mdf/context.py/get_nodes