80 lines
3.1 KiB
Python
80 lines
3.1 KiB
Python
# 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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Simple Scheduler
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"""
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from oslo_config import cfg
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from manila import db
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from manila import exception
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from manila.i18n import _
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from manila.scheduler.drivers import base
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from manila.scheduler.drivers import chance
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from manila import utils
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simple_scheduler_opts = [
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cfg.IntOpt("max_gigabytes",
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default=10000,
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help="Maximum number of volume gigabytes to allow per host."), ]
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CONF = cfg.CONF
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CONF.register_opts(simple_scheduler_opts)
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class SimpleScheduler(chance.ChanceScheduler):
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"""Implements Naive Scheduler that tries to find least loaded host."""
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def schedule_create_share(self, context, request_spec, filter_properties):
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"""Picks a host that is up and has the fewest shares."""
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# TODO(rushiagr) - pick only hosts that run shares
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elevated = context.elevated()
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share_id = request_spec.get('share_id')
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snapshot_id = request_spec.get('snapshot_id')
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share_properties = request_spec.get('share_properties')
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share_size = share_properties.get('size')
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instance_properties = request_spec.get('share_instance_properties', {})
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availability_zone_id = instance_properties.get('availability_zone_id')
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results = db.service_get_all_share_sorted(elevated)
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if availability_zone_id:
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results = [(service_g, gigs) for (service_g, gigs) in results
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if (service_g['availability_zone_id']
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== availability_zone_id)]
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for result in results:
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(service, share_gigabytes) = result
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if share_gigabytes + share_size > CONF.max_gigabytes:
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msg = _("Not enough allocatable share gigabytes remaining")
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raise exception.NoValidHost(reason=msg)
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if utils.service_is_up(service) and not service['disabled']:
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updated_share = base.share_update_db(context,
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share_id,
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service['host'])
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self.share_rpcapi.create_share_instance(
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context,
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updated_share.instance,
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service['host'],
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request_spec,
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None,
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snapshot_id=snapshot_id)
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return None
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msg = _("Is the appropriate service running?")
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raise exception.NoValidHost(reason=msg)
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