153 lines
5.7 KiB
Python
153 lines
5.7 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# 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 base class that all Schedulers should inherit from
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"""
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import sys
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from oslo.config import cfg
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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.conductor import api as conductor_api
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from nova import db
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from nova import exception
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from nova import notifications
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from nova import notifier
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from nova.openstack.common.gettextutils import _
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from nova.openstack.common import importutils
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from nova.openstack.common import log as logging
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from nova.openstack.common import timeutils
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from nova import servicegroup
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LOG = logging.getLogger(__name__)
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scheduler_driver_opts = [
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cfg.StrOpt('scheduler_host_manager',
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default='nova.scheduler.host_manager.HostManager',
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help='The scheduler host manager class to use'),
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cfg.IntOpt('scheduler_max_attempts',
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default=3,
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help='Maximum number of attempts to schedule an instance'),
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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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def handle_schedule_error(context, ex, instance_uuid, request_spec):
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"""On run_instance failure, update instance state and
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send notifications.
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"""
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if not isinstance(ex, exception.NoValidHost):
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LOG.exception(_("Exception during scheduler.run_instance"))
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state = vm_states.ERROR.upper()
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LOG.warning(_('Setting instance to %s state.'), state,
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instance_uuid=instance_uuid)
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(old_ref, new_ref) = db.instance_update_and_get_original(context,
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instance_uuid, {'vm_state': vm_states.ERROR,
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'task_state': None})
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notifications.send_update(context, old_ref, new_ref,
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service="scheduler")
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compute_utils.add_instance_fault_from_exc(context,
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conductor_api.LocalAPI(),
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new_ref, ex, sys.exc_info())
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properties = request_spec.get('instance_properties', {})
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payload = dict(request_spec=request_spec,
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instance_properties=properties,
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instance_id=instance_uuid,
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state=vm_states.ERROR,
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method='run_instance',
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reason=ex)
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notifier.get_notifier('scheduler').error(context,
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'scheduler.run_instance', payload)
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def instance_update_db(context, instance_uuid, extra_values=None):
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"""Clear the host and node - set the scheduled_at field of an Instance.
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:returns: An Instance with the updated fields set properly.
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"""
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now = timeutils.utcnow()
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values = {'host': None, 'node': None, 'scheduled_at': now}
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if extra_values:
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values.update(extra_values)
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return db.instance_update(context, instance_uuid, values)
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class Scheduler(object):
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"""The base class that all Scheduler classes should inherit from."""
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def __init__(self):
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self.host_manager = importutils.import_object(
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CONF.scheduler_host_manager)
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self.servicegroup_api = servicegroup.API()
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def update_service_capabilities(self, service_name, host, capabilities):
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"""Process a capability update from a service node."""
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self.host_manager.update_service_capabilities(service_name,
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host, capabilities)
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def hosts_up(self, context, topic):
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"""Return the list of hosts that have a running service for topic."""
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services = db.service_get_all_by_topic(context, topic)
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return [service['host']
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for service in services
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if self.servicegroup_api.service_is_up(service)]
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def group_hosts(self, context, group):
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"""Return the list of hosts that have VM's from the group."""
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# The system_metadata 'group' will be filtered
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members = db.instance_get_all_by_filters(context,
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{'deleted': False, 'system_metadata': {'group': group}})
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return [member['host']
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for member in members
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if member.get('host') is not None]
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def schedule_run_instance(self, context, request_spec,
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admin_password, injected_files,
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requested_networks, is_first_time,
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filter_properties, legacy_bdm_in_spec):
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"""Must override schedule_run_instance method for scheduler to work."""
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msg = _("Driver must implement schedule_run_instance")
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raise NotImplementedError(msg)
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def select_destinations(self, context, request_spec, filter_properties):
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"""Must override select_destinations method.
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:return: A list of dicts with 'host', 'nodename' and 'limits' as keys
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that satisfies the request_spec and filter_properties.
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"""
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msg = _("Driver must implement select_destinations")
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raise NotImplementedError(msg)
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def select_hosts(self, context, request_spec, filter_properties):
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"""Must override select_hosts method for scheduler to work."""
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msg = _("Driver must implement select_hosts")
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raise NotImplementedError(msg)
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