def signal_kernel(self, signum):
        if self.has_kernel:
            self.kernel.send_signal(signum)
        else:
            raise RuntimeError("Cannot signal kernel. No kernel is running!")
:param app_id: the id of the application
dataset/ETHPy150Open ipython/ipython-py3k/IPython/parallel/engine/kernelstarter.py/KernelStarter.signal_kernel--crossover with--dataset/ETHPy150Open dcos/dcos-cli/cli/dcoscli/marathon/main.py/_task_list