d1ed5376aa
Like with the compute RPC API, we're unlikely to still work well with RPC client using older 1.x version because of DB schema changes. In that case, we may as well remove 1.x support in Folsom and rip out the potentially buggy backwards compat code. This should also make backporting fixes from Grizzly easier. Deployers following trunk can upgrade all their nodes to use the version 2.0 API before deploying this commit. Change-Id: Iee099751bda9637da5e134357d28e89d5fba9895
98 lines
4.0 KiB
Python
98 lines
4.0 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright (c) 2010 OpenStack, LLC.
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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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Chance (Random) Scheduler implementation
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"""
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import random
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from nova import exception
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from nova import flags
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from nova.scheduler import driver
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FLAGS = flags.FLAGS
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class ChanceScheduler(driver.Scheduler):
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"""Implements Scheduler as a random node selector."""
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def _filter_hosts(self, request_spec, hosts, filter_properties):
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"""Filter a list of hosts based on request_spec."""
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ignore_hosts = filter_properties.get('ignore_hosts', [])
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hosts = [host for host in hosts if host not in ignore_hosts]
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return hosts
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def _schedule(self, context, topic, request_spec, filter_properties):
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"""Picks a host that is up at random."""
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elevated = context.elevated()
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hosts = self.hosts_up(elevated, topic)
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if not hosts:
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msg = _("Is the appropriate service running?")
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raise exception.NoValidHost(reason=msg)
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hosts = self._filter_hosts(request_spec, hosts, filter_properties)
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if not hosts:
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msg = _("Could not find another compute")
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raise exception.NoValidHost(reason=msg)
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return hosts[int(random.random() * len(hosts))]
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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):
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"""Create and run an instance or instances"""
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instances = []
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instance_uuids = request_spec.get('instance_uuids')
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for num, instance_uuid in enumerate(instance_uuids):
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host = self._schedule(context, 'compute', request_spec,
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filter_properties)
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request_spec['instance_properties']['launch_index'] = num
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updated_instance = driver.instance_update_db(context,
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instance_uuid, host)
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self.compute_rpcapi.run_instance(context,
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instance=updated_instance, host=host,
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requested_networks=requested_networks,
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injected_files=injected_files,
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admin_password=admin_password, is_first_time=is_first_time,
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request_spec=request_spec,
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filter_properties=filter_properties)
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instances.append(driver.encode_instance(updated_instance))
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return instances
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def schedule_prep_resize(self, context, image, request_spec,
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filter_properties, instance, instance_type,
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reservations):
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"""Select a target for resize."""
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host = self._schedule(context, 'compute', request_spec,
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filter_properties)
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self.compute_rpcapi.prep_resize(context, image, instance,
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instance_type, host, reservations)
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def schedule_create_volume(self, context, volume_id, snapshot_id,
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reservations):
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"""Picks a host that is up at random."""
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host = self._schedule(context, FLAGS.volume_topic, None, {})
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driver.cast_to_host(context, FLAGS.volume_topic, host, 'create_volume',
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volume_id=volume_id, snapshot_id=snapshot_id,
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reservations=reservations)
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