f887a3952a
The table represents the current state of compute nodes and will be used by the scheduler when selecting a host. Re: https://blueprints.launchpad.net/nova/+spec/scaling-zones This is just the db & notification portion of the branch. The scheduler portion is being deferring until comstuds branch gets merged since it conflicts heavily. NOTE: Compute notifications are now two-part. There is a compute.instance.XXX.start event and a compute.instance.XXX.end message instead of the previous compute.instance.XXX event (which is the same as the .end message) Change-Id: Ia8e68680cb0924c59df84f2eec858febf4926d65
82 lines
2.7 KiB
Python
82 lines
2.7 KiB
Python
# Copyright 2011 OpenStack LLC.
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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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from nova import context
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from nova import db
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from nova import log as logging
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LOG = logging.getLogger('nova.notifier.capacity_notifier')
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def notify(message):
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"""Look for specific compute manager events and interprete them
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so as to keep the Capacity table up to date.
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NOTE: the True/False return codes are only for testing.
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"""
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# The event_type must start with 'compute.instance.'
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event_type = message.get('event_type', None)
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preamble = 'compute.instance.'
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if not event_type or not event_type.startswith(preamble):
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return False
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# Events we're interested in end with .start and .end
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event = event_type[len(preamble):]
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parts = event.split('.')
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suffix = parts[-1].lower()
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event = event[:(-len(suffix) - 1)]
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if suffix not in ['start', 'end']:
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return False
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started = suffix == 'start'
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ended = suffix == 'end'
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if started and event == 'create':
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# We've already updated this stuff in the scheduler. Don't redo the
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# work here.
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return False
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work = 1 if started else -1
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# Extract the host name from the publisher id ...
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publisher_preamble = 'compute.'
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publisher = message.get('publisher_id', None)
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if not publisher or not publisher.startswith(publisher_preamble):
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return False
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host = publisher[len(publisher_preamble):]
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# If we deleted an instance, make sure we reclaim the resources.
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# We may need to do something explicit for rebuild/migrate.
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free_ram_mb = 0
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free_disk_gb = 0
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vms = 0
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if ended and event == 'delete':
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vms = -1
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payload = message.get('payload', {})
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free_ram_mb = payload.get('memory_mb', 0)
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free_disk_gb = payload.get('disk_gb', 0)
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LOG.debug("EventType=%(event_type)s -> host %(host)s: "
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"ram %(free_ram_mb)d, disk %(free_disk_gb)d, "
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"work %(work)d, vms%(vms)d" % locals())
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db.api.compute_node_utilization_update(context.get_admin_context(), host,
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free_ram_mb_delta=free_ram_mb, free_disk_gb_delta=free_disk_gb,
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work_delta=work, vm_delta=vms)
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return True
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