162 lines
6.7 KiB
Python
162 lines
6.7 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 Service
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"""
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import functools
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from nova import db
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from nova import flags
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from nova import log as logging
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from nova import manager
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from nova import rpc
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from nova import utils
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from nova.scheduler import zone_manager
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LOG = logging.getLogger('nova.scheduler.manager')
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FLAGS = flags.FLAGS
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flags.DEFINE_string('scheduler_driver',
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'nova.scheduler.chance.ChanceScheduler',
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'Driver to use for the scheduler')
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class SchedulerManager(manager.Manager):
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"""Chooses a host to run instances on."""
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def __init__(self, scheduler_driver=None, *args, **kwargs):
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self.zone_manager = zone_manager.ZoneManager()
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if not scheduler_driver:
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scheduler_driver = FLAGS.scheduler_driver
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self.driver = utils.import_object(scheduler_driver)
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self.driver.set_zone_manager(self.zone_manager)
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super(SchedulerManager, self).__init__(*args, **kwargs)
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def __getattr__(self, key):
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"""Converts all method calls to use the schedule method"""
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return functools.partial(self._schedule, key)
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def periodic_tasks(self, context=None):
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"""Poll child zones periodically to get status."""
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self.zone_manager.ping(context)
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def get_host_list(self, context=None):
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"""Get a list of hosts from the ZoneManager."""
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return self.zone_manager.get_host_list()
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def get_zone_list(self, context=None):
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"""Get a list of zones from the ZoneManager."""
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return self.zone_manager.get_zone_list()
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def get_zone_capabilities(self, context=None):
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"""Get the normalized set of capabilites for this zone."""
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return self.zone_manager.get_zone_capabilities(context)
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def update_service_capabilities(self, context=None, service_name=None,
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host=None, capabilities={}):
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"""Process a capability update from a service node."""
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self.zone_manager.update_service_capabilities(service_name,
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host, capabilities)
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def select(self, context=None, *args, **kwargs):
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"""Select a list of hosts best matching the provided specs."""
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return self.driver.select(context, *args, **kwargs)
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def get_scheduler_rules(self, context=None, *args, **kwargs):
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"""Ask the driver how requests should be made of it."""
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return self.driver.get_scheduler_rules(context, *args, **kwargs)
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def _schedule(self, method, context, topic, *args, **kwargs):
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"""Tries to call schedule_* method on the driver to retrieve host.
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Falls back to schedule(context, topic) if method doesn't exist.
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"""
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driver_method = 'schedule_%s' % method
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elevated = context.elevated()
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try:
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host = getattr(self.driver, driver_method)(elevated, *args,
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**kwargs)
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except AttributeError, e:
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LOG.warning(_("Driver Method %(driver_method)s missing: %(e)s."
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"Reverting to schedule()") % locals())
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host = self.driver.schedule(elevated, topic, *args, **kwargs)
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if not host:
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LOG.debug(_("%(topic)s %(method)s handled in Scheduler")
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% locals())
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return
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rpc.cast(context,
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db.queue_get_for(context, topic, host),
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{"method": method,
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"args": kwargs})
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LOG.debug(_("Casted to %(topic)s %(host)s for %(method)s") % locals())
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# NOTE (masumotok) : This method should be moved to nova.api.ec2.admin.
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# Based on bexar design summit discussion,
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# just put this here for bexar release.
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def show_host_resources(self, context, host, *args):
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"""Shows the physical/usage resource given by hosts.
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:param context: security context
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:param host: hostname
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:returns:
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example format is below.
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{'resource':D, 'usage':{proj_id1:D, proj_id2:D}}
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D: {'vcpus':3, 'memory_mb':2048, 'local_gb':2048}
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"""
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compute_ref = db.service_get_all_compute_by_host(context, host)
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compute_ref = compute_ref[0]
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# Getting physical resource information
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compute_node_ref = compute_ref['compute_node'][0]
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resource = {'vcpus': compute_node_ref['vcpus'],
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'memory_mb': compute_node_ref['memory_mb'],
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'local_gb': compute_node_ref['local_gb'],
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'vcpus_used': compute_node_ref['vcpus_used'],
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'memory_mb_used': compute_node_ref['memory_mb_used'],
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'local_gb_used': compute_node_ref['local_gb_used']}
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# Getting usage resource information
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usage = {}
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instance_refs = db.instance_get_all_by_host(context,
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compute_ref['host'])
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if not instance_refs:
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return {'resource': resource, 'usage': usage}
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project_ids = [i['project_id'] for i in instance_refs]
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project_ids = list(set(project_ids))
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for project_id in project_ids:
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vcpus = db.instance_get_vcpu_sum_by_host_and_project(context,
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host,
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project_id)
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mem = db.instance_get_memory_sum_by_host_and_project(context,
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host,
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project_id)
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hdd = db.instance_get_disk_sum_by_host_and_project(context,
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host,
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project_id)
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usage[project_id] = {'vcpus': int(vcpus),
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'memory_mb': int(mem),
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'local_gb': int(hdd)}
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return {'resource': resource, 'usage': usage}
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