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# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2010 OpenStack LLC.
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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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# http://www.apache.org/licenses/LICENSE-2.0
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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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"""Possible states for host aggregates.
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An aggregate may be 'created', in which case the admin has triggered its
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creation, but the underlying hypervisor pool has not actually being set up
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yet. An aggregate may be 'changing', meaning that the underlying hypervisor
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pool is being setup. An aggregate may be 'active', in which case the underlying
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hypervisor pool is up and running. An aggregate may be 'dismissed' when it has
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no hosts and it has been deleted. An aggregate may be in 'error' in all other
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A 'created' aggregate becomes 'changing' during the first request of
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adding a host. During a 'changing' status no other requests will be accepted;
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this is to allow the hypervisor layer to instantiate the underlying pool
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without any potential race condition that may incur in master/slave-based
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configurations. The aggregate goes into the 'active' state when the underlying
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pool has been correctly instantiated.
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All other operations (e.g. add/remove hosts) that succeed will keep the
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aggregate in the 'active' state. If a number of continuous requests fail,
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an 'active' aggregate goes into an 'error' state. To recover from such a state,
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admin intervention is required. Currently an error state is irreversible,
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that is, in order to recover from it an aggregate must be deleted.
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DISMISSED = 'dismissed'
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nova/compute/aggregate_states.py
