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     SLURM_END_STATES = frozenset(['down\n', 'down*\n',
  14                                   'drain\n', 'drain*\n',
  15                                   'fail\n', 'fail*\n'])
  16     SLURM_DRAIN_STATES = frozenset(['drain\n', 'drng\n'])
  17
  18     def on_start(self):
  19         arv_node = self._arvados_node()
  20         if arv_node is None:
  21             self._nodename = None
  22             return super(ComputeNodeShutdownActor, self).on_start()
  23         else:
  24             self._nodename = arv_node['hostname']
  25             self._logger.info("Draining SLURM node %s", self._nodename)
  26             self._later.issue_slurm_drain()
  27
  28     def _set_node_state(self, state, *args):
  29         cmd = ['scontrol', 'update', 'NodeName=' + self._nodename,
  30                'State=' + state]
  31         cmd.extend(args)
  32         subprocess.check_output(cmd)
  33
  34     def _get_slurm_state(self):
  35         return subprocess.check_output(['sinfo', '--noheader', '-o', '%t', '-n', self._nodename])
  36
  37     @ShutdownActorBase._retry((subprocess.CalledProcessError,))
  38     def cancel_shutdown(self):
  39         if self._nodename:
  40             if self._get_slurm_state() in self.SLURM_DRAIN_STATES:
  41                 # Resume from "drng" or "drain"
  42                 self._set_node_state('RESUME')
  43             else:
  44                 # Node is in a state such as 'idle' or 'alloc' so don't
  45                 # try to resume it because that will just raise an error.
  46                 pass
  47         return super(ComputeNodeShutdownActor, self).cancel_shutdown()
  48
  49     @ShutdownActorBase._stop_if_window_closed
  50     @ShutdownActorBase._retry((subprocess.CalledProcessError,))
  51     def issue_slurm_drain(self):
  52         self._set_node_state('DRAIN', 'Reason=Node Manager shutdown')
  53         self._logger.info("Waiting for SLURM node %s to drain", self._nodename)
  54         self._later.await_slurm_drain()
  55
  56     @ShutdownActorBase._stop_if_window_closed
  57     @ShutdownActorBase._retry((subprocess.CalledProcessError,))
  58     def await_slurm_drain(self):
  59         output = self._get_slurm_state()
  60         if output in self.SLURM_END_STATES:
  61             self._later.shutdown_node()
  62         else:
  63             self._timer.schedule(time.time() + 10,
  64                                  self._later.await_slurm_drain)