services/nodemanager/arvnodeman/computenode/dispatch/slurm.py

   1 #!/usr/bin/env python
   2
   3 from __future__ import absolute_import, print_function
   4
   5 import subprocess
   6 import time
   7
   8 from . import \
   9     ComputeNodeSetupActor, ComputeNodeUpdateActor, ComputeNodeMonitorActor
  10 from . import ComputeNodeShutdownActor as ShutdownActorBase
  11
  12 class ComputeNodeShutdownActor(ShutdownActorBase):
  13     def on_start(self):
  14         arv_node = self._monitor.arvados_node.get()
  15         if arv_node is None:
  16             return super(ComputeNodeShutdownActor, self).on_start()
  17         else:
  18             self._nodename = arv_node['hostname']
  19             self._logger.info("Draining SLURM node %s", self._nodename)
  20             self._later.issue_slurm_drain()
  21
  22     def _set_node_state(self, state, *args):
  23         cmd = ['scontrol', 'update', 'NodeName=' + self._nodename,
  24                'State=' + state]
  25         cmd.extend(args)
  26         subprocess.check_output(cmd)
  27
  28     @ShutdownActorBase._retry((subprocess.CalledProcessError,))
  29     def cancel_shutdown(self):
  30         self._set_node_state('RESUME')
  31         return super(ComputeNodeShutdownActor, self).cancel_shutdown()
  32
  33     @ShutdownActorBase._stop_if_window_closed
  34     @ShutdownActorBase._retry((subprocess.CalledProcessError,))
  35     def issue_slurm_drain(self):
  36         self._set_node_state('DRAIN', 'Reason=Node Manager shutdown')
  37         self._logger.info("Waiting for SLURM node %s to drain", self._nodename)
  38         self._later.await_slurm_drain()
  39
  40     @ShutdownActorBase._stop_if_window_closed
  41     @ShutdownActorBase._retry((subprocess.CalledProcessError,))
  42     def await_slurm_drain(self):
  43         output = subprocess.check_output(
  44             ['sinfo', '--noheader', '-o', '%t', '-n', self._nodename])
  45         if output == 'drain\n':
  46             self._later.shutdown_node()
  47         else:
  48             self._timer.schedule(time.time() + 10,
  49                                  self._later.await_slurm_drain)