059b0302f9
Modules import nova.config for two reasons right now - firstly, to reference nova.config.CONF and, secondly, if they use one of the options defined in nova.config. Often modules import nova.openstack.common.cfg and nova.config which is a bit pointless since they could just use cfg.CONF if they just want to nova.config in order to reference CONF. Let's just use cfg.CONF everywhere and we can explicitly state where we actually require options defined in nova.config. Change-Id: Ie4184a74e3e78c99658becb18dce1c2087e450bb
78 lines
2.9 KiB
Python
78 lines
2.9 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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Scheduler that allows routing some calls to one driver and others to another.
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This scheduler was originally used to deal with both compute and volume. But
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is now used for openstack extensions that want to use the nova-scheduler to
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schedule requests to compute nodes but provide their own manager and topic.
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https://bugs.launchpad.net/nova/+bug/1009681
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"""
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from nova.openstack.common import cfg
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from nova.openstack.common import importutils
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from nova.scheduler import driver
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multi_scheduler_opts = [
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cfg.StrOpt('compute_scheduler_driver',
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default='nova.scheduler.'
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'filter_scheduler.FilterScheduler',
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help='Driver to use for scheduling compute calls'),
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cfg.StrOpt('default_scheduler_driver',
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default='nova.scheduler.chance.ChanceScheduler',
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help='Default driver to use for scheduling calls'),
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]
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CONF = cfg.CONF
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CONF.register_opts(multi_scheduler_opts)
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class MultiScheduler(driver.Scheduler):
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"""A scheduler that holds multiple sub-schedulers.
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This exists to allow flag-driven composibility of schedulers, allowing
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third parties to integrate custom schedulers more easily.
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"""
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def __init__(self):
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super(MultiScheduler, self).__init__()
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compute_driver = importutils.import_object(
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CONF.compute_scheduler_driver)
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default_driver = importutils.import_object(
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CONF.default_scheduler_driver)
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self.drivers = {'compute': compute_driver,
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'default': default_driver}
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def schedule_run_instance(self, *args, **kwargs):
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return self.drivers['compute'].schedule_run_instance(*args, **kwargs)
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def schedule_prep_resize(self, *args, **kwargs):
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return self.drivers['compute'].schedule_prep_resize(*args, **kwargs)
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def update_service_capabilities(self, service_name, host, capabilities):
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# Multi scheduler is only a holder of sub-schedulers, so
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# pass the capabilities to the schedulers that matter
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for d in self.drivers.values():
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d.update_service_capabilities(service_name, host, capabilities)
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