184 lines
8.3 KiB
Python
184 lines
8.3 KiB
Python
# Copyright (c) 2010 OpenStack Foundation
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# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""
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Scheduler Service
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"""
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from oslo.config import cfg
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from oslo import messaging
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from oslo.serialization import jsonutils
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from oslo.utils import excutils
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from oslo.utils import importutils
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from nova.compute import rpcapi as compute_rpcapi
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from nova.compute import utils as compute_utils
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from nova.compute import vm_states
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from nova import exception
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from nova import manager
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from nova import objects
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from nova.openstack.common import log as logging
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from nova.openstack.common import periodic_task
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from nova import quota
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from nova.scheduler import utils as scheduler_utils
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LOG = logging.getLogger(__name__)
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scheduler_driver_opts = [
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cfg.StrOpt('scheduler_driver',
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default='nova.scheduler.filter_scheduler.FilterScheduler',
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help='Default driver to use for the scheduler'),
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cfg.IntOpt('scheduler_driver_task_period',
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default=60,
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help='How often (in seconds) to run periodic tasks in '
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'the scheduler driver of your choice. '
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'Please note this is likely to interact with the value '
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'of service_down_time, but exactly how they interact '
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'will depend on your choice of scheduler driver.'),
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]
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CONF = cfg.CONF
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CONF.register_opts(scheduler_driver_opts)
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QUOTAS = quota.QUOTAS
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class SchedulerManager(manager.Manager):
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"""Chooses a host to run instances on."""
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target = messaging.Target(version='3.1')
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def __init__(self, scheduler_driver=None, *args, **kwargs):
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if not scheduler_driver:
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scheduler_driver = CONF.scheduler_driver
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self.driver = importutils.import_object(scheduler_driver)
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self.compute_rpcapi = compute_rpcapi.ComputeAPI()
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super(SchedulerManager, self).__init__(service_name='scheduler',
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*args, **kwargs)
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# NOTE(alaski): Remove this method when the scheduler rpc interface is
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# bumped to 4.x as it is no longer used.
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def run_instance(self, context, request_spec, admin_password,
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injected_files, requested_networks, is_first_time,
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filter_properties, legacy_bdm_in_spec):
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"""Tries to call schedule_run_instance on the driver.
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Sets instance vm_state to ERROR on exceptions
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"""
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instance_uuids = request_spec['instance_uuids']
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with compute_utils.EventReporter(context, 'schedule', *instance_uuids):
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try:
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return self.driver.schedule_run_instance(context,
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request_spec, admin_password, injected_files,
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requested_networks, is_first_time, filter_properties,
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legacy_bdm_in_spec)
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except exception.NoValidHost as ex:
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# don't re-raise
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self._set_vm_state_and_notify('run_instance',
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{'vm_state': vm_states.ERROR,
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'task_state': None},
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context, ex, request_spec)
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except Exception as ex:
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with excutils.save_and_reraise_exception():
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self._set_vm_state_and_notify('run_instance',
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{'vm_state': vm_states.ERROR,
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'task_state': None},
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context, ex, request_spec)
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# NOTE(sbauza): Remove this method when the scheduler rpc interface is
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# bumped to 4.x as it is no longer used.
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def prep_resize(self, context, image, request_spec, filter_properties,
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instance, instance_type, reservations):
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"""Tries to call schedule_prep_resize on the driver.
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Sets instance vm_state to ACTIVE on NoHostFound
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Sets vm_state to ERROR on other exceptions
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"""
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instance_uuid = instance['uuid']
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with compute_utils.EventReporter(context, 'schedule', instance_uuid):
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try:
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request_spec['num_instances'] = len(
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request_spec['instance_uuids'])
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hosts = self.driver.select_destinations(
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context, request_spec, filter_properties)
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host_state = hosts[0]
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scheduler_utils.populate_filter_properties(filter_properties,
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host_state)
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# context is not serializable
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filter_properties.pop('context', None)
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(host, node) = (host_state['host'], host_state['nodename'])
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attrs = ['metadata', 'system_metadata', 'info_cache',
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'security_groups']
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inst_obj = objects.Instance._from_db_object(
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context, objects.Instance(), instance,
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expected_attrs=attrs)
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self.compute_rpcapi.prep_resize(
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context, image, inst_obj, instance_type, host,
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reservations, request_spec=request_spec,
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filter_properties=filter_properties, node=node)
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except exception.NoValidHost as ex:
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vm_state = instance.get('vm_state', vm_states.ACTIVE)
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self._set_vm_state_and_notify('prep_resize',
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{'vm_state': vm_state,
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'task_state': None},
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context, ex, request_spec)
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if reservations:
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QUOTAS.rollback(context, reservations)
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except Exception as ex:
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with excutils.save_and_reraise_exception():
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self._set_vm_state_and_notify('prep_resize',
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{'vm_state': vm_states.ERROR,
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'task_state': None},
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context, ex, request_spec)
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if reservations:
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QUOTAS.rollback(context, reservations)
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def _set_vm_state_and_notify(self, method, updates, context, ex,
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request_spec):
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scheduler_utils.set_vm_state_and_notify(
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context, 'scheduler', method, updates, ex, request_spec, self.db)
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@periodic_task.periodic_task
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def _expire_reservations(self, context):
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QUOTAS.expire(context)
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@periodic_task.periodic_task(spacing=CONF.scheduler_driver_task_period,
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run_immediately=True)
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def _run_periodic_tasks(self, context):
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self.driver.run_periodic_tasks(context)
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@messaging.expected_exceptions(exception.NoValidHost)
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def select_destinations(self, context, request_spec, filter_properties):
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"""Returns destinations(s) best suited for this request_spec and
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filter_properties.
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The result should be a list of dicts with 'host', 'nodename' and
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'limits' as keys.
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"""
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# TODO(melwitt): Remove this in version 4.0 of the RPC API
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flavor = filter_properties.get('instance_type')
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if flavor and not isinstance(flavor, objects.Flavor):
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# Code downstream may expect extra_specs to be populated since it
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# is receiving an object, so lookup the flavor to ensure this.
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flavor = objects.Flavor.get_by_id(context, flavor['id'])
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filter_properties = dict(filter_properties, instance_type=flavor)
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dests = self.driver.select_destinations(context, request_spec,
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filter_properties)
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return jsonutils.to_primitive(dests)
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