509 lines
20 KiB
Python
509 lines
20 KiB
Python
# Copyright (c) 2011 OpenStack Foundation
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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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Manage hosts in the current zone.
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"""
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import UserDict
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from oslo.utils import timeutils
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from oslo_config import cfg
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from cinder import db
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from cinder import exception
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from cinder.i18n import _LI, _LW
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from cinder.openstack.common import log as logging
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from cinder.openstack.common.scheduler import filters
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from cinder.openstack.common.scheduler import weights
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from cinder import utils
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from cinder.volume import utils as vol_utils
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host_manager_opts = [
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cfg.ListOpt('scheduler_default_filters',
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default=[
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'AvailabilityZoneFilter',
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'CapacityFilter',
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'CapabilitiesFilter'
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],
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help='Which filter class names to use for filtering hosts '
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'when not specified in the request.'),
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cfg.ListOpt('scheduler_default_weighers',
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default=[
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'CapacityWeigher'
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],
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help='Which weigher class names to use for weighing hosts.')
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]
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CONF = cfg.CONF
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CONF.register_opts(host_manager_opts)
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CONF.import_opt('scheduler_driver', 'cinder.scheduler.manager')
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LOG = logging.getLogger(__name__)
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class ReadOnlyDict(UserDict.IterableUserDict):
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"""A read-only dict."""
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def __init__(self, source=None):
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self.data = {}
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self.update(source)
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def __setitem__(self, key, item):
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raise TypeError
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def __delitem__(self, key):
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raise TypeError
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def clear(self):
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raise TypeError
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def pop(self, key, *args):
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raise TypeError
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def popitem(self):
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raise TypeError
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def update(self, source=None):
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if source is None:
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return
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elif isinstance(source, UserDict.UserDict):
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self.data = source.data
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elif isinstance(source, type({})):
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self.data = source
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else:
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raise TypeError
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class HostState(object):
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"""Mutable and immutable information tracked for a volume backend."""
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def __init__(self, host, capabilities=None, service=None):
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self.capabilities = None
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self.service = None
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self.host = host
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self.update_capabilities(capabilities, service)
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self.volume_backend_name = None
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self.vendor_name = None
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self.driver_version = 0
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self.storage_protocol = None
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self.QoS_support = False
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# Mutable available resources.
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# These will change as resources are virtually "consumed".
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self.total_capacity_gb = 0
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# capacity has been allocated in cinder POV, which should be
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# sum(vol['size'] for vol in vols_on_hosts)
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self.allocated_capacity_gb = 0
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self.free_capacity_gb = None
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self.reserved_percentage = 0
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# PoolState for all pools
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self.pools = {}
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self.updated = None
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def update_capabilities(self, capabilities=None, service=None):
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# Read-only capability dicts
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if capabilities is None:
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capabilities = {}
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self.capabilities = ReadOnlyDict(capabilities)
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if service is None:
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service = {}
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self.service = ReadOnlyDict(service)
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def update_from_volume_capability(self, capability, service=None):
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"""Update information about a host from its volume_node info.
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'capability' is the status info reported by volume backend, a typical
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capability looks like this:
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capability = {
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'volume_backend_name': 'Local iSCSI', #\
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'vendor_name': 'OpenStack', # backend level
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'driver_version': '1.0', # mandatory/fixed
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'storage_protocol': 'iSCSI', #- stats&capabilities
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'active_volumes': 10, #\
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'IOPS_provisioned': 30000, # optional custom
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'fancy_capability_1': 'eat', # stats & capabilities
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'fancy_capability_2': 'drink', #/
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'pools': [
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{'pool_name': '1st pool', #\
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'total_capacity_gb': 500, # mandatory stats for
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'free_capacity_gb': 230, # pools
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'allocated_capacity_gb': 270, # |
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'QoS_support': 'False', # |
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'reserved_percentage': 0, #/
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'dying_disks': 100, #\
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'super_hero_1': 'spider-man', # optional custom
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'super_hero_2': 'flash', # stats & capabilities
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'super_hero_3': 'neoncat' #/
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},
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{'pool_name': '2nd pool',
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'total_capacity_gb': 1024,
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'free_capacity_gb': 1024,
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'allocated_capacity_gb': 0,
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'QoS_support': 'False',
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'reserved_percentage': 0,
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'dying_disks': 200,
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'super_hero_1': 'superman',
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'super_hero_2': ' ',
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'super_hero_2': 'Hulk',
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}
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]
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}
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"""
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self.update_capabilities(capability, service)
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if capability:
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if self.updated and self.updated > capability['timestamp']:
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return
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# Update backend level info
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self.update_backend(capability)
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# Update pool level info
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self.update_pools(capability, service)
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def update_pools(self, capability, service):
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"""Update storage pools information from backend reported info."""
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if not capability:
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return
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pools = capability.get('pools', None)
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active_pools = set()
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if pools and isinstance(pools, list):
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# Update all pools stats according to information from list
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# of pools in volume capacity
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for pool_cap in pools:
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pool_name = pool_cap['pool_name']
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self._append_backend_info(pool_cap)
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cur_pool = self.pools.get(pool_name, None)
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if not cur_pool:
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# Add new pool
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cur_pool = PoolState(self.host, pool_cap, pool_name)
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self.pools[pool_name] = cur_pool
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cur_pool.update_from_volume_capability(pool_cap, service)
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active_pools.add(pool_name)
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elif pools is None:
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# To handle legacy driver that doesn't report pool
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# information in the capability, we have to prepare
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# a pool from backend level info, or to update the one
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# we created in self.pools.
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pool_name = self.volume_backend_name
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if pool_name is None:
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# To get DEFAULT_POOL_NAME
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pool_name = vol_utils.extract_host(self.host, 'pool', True)
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if len(self.pools) == 0:
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# No pool was there
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single_pool = PoolState(self.host, capability, pool_name)
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self._append_backend_info(capability)
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self.pools[pool_name] = single_pool
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else:
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# this is a update from legacy driver
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try:
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single_pool = self.pools[pool_name]
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except KeyError:
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single_pool = PoolState(self.host, capability, pool_name)
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self._append_backend_info(capability)
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self.pools[pool_name] = single_pool
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single_pool.update_from_volume_capability(capability, service)
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active_pools.add(pool_name)
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# remove non-active pools from self.pools
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nonactive_pools = set(self.pools.keys()) - active_pools
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for pool in nonactive_pools:
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LOG.debug("Removing non-active pool %(pool)s @ %(host)s "
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"from scheduler cache." % {'pool': pool,
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'host': self.host})
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del self.pools[pool]
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def _append_backend_info(self, pool_cap):
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# Fill backend level info to pool if needed.
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if not pool_cap.get('volume_backend_name', None):
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pool_cap['volume_backend_name'] = self.volume_backend_name
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if not pool_cap.get('storage_protocol', None):
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pool_cap['storage_protocol'] = self.storage_protocol
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if not pool_cap.get('vendor_name', None):
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pool_cap['vendor_name'] = self.vendor_name
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if not pool_cap.get('driver_version', None):
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pool_cap['driver_version'] = self.driver_version
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if not pool_cap.get('timestamp', None):
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pool_cap['timestamp'] = self.updated
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def update_backend(self, capability):
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self.volume_backend_name = capability.get('volume_backend_name', None)
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self.vendor_name = capability.get('vendor_name', None)
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self.driver_version = capability.get('driver_version', None)
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self.storage_protocol = capability.get('storage_protocol', None)
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self.updated = capability['timestamp']
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def consume_from_volume(self, volume):
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"""Incrementally update host state from an volume."""
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volume_gb = volume['size']
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self.allocated_capacity_gb += volume_gb
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if self.free_capacity_gb == 'infinite':
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# There's virtually infinite space on back-end
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pass
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elif self.free_capacity_gb == 'unknown':
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# Unable to determine the actual free space on back-end
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pass
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else:
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self.free_capacity_gb -= volume_gb
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self.updated = timeutils.utcnow()
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def __repr__(self):
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# FIXME(zhiteng) backend level free_capacity_gb isn't as
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# meaningful as it used to be before pool is introduced, we'd
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# come up with better representation of HostState.
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return ("host '%s': free_capacity_gb: %s, pools: %s" %
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(self.host, self.free_capacity_gb, self.pools))
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class PoolState(HostState):
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def __init__(self, host, capabilities, pool_name):
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new_host = vol_utils.append_host(host, pool_name)
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super(PoolState, self).__init__(new_host, capabilities)
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self.pool_name = pool_name
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# No pools in pool
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self.pools = None
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def update_from_volume_capability(self, capability, service=None):
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"""Update information about a pool from its volume_node info."""
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self.update_capabilities(capability, service)
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if capability:
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if self.updated and self.updated > capability['timestamp']:
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return
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self.update_backend(capability)
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self.total_capacity_gb = capability.get('total_capacity_gb', 0)
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self.free_capacity_gb = capability.get('free_capacity_gb', 0)
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self.allocated_capacity_gb = capability.get(
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'allocated_capacity_gb', 0)
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self.QoS_support = capability.get('QoS_support', False)
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self.reserved_percentage = capability.get('reserved_percentage', 0)
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def update_pools(self, capability):
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# Do nothing, since we don't have pools within pool, yet
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pass
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class HostManager(object):
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"""Base HostManager class."""
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host_state_cls = HostState
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def __init__(self):
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self.service_states = {} # { <host>: {<service>: {cap k : v}}}
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self.host_state_map = {}
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self.filter_handler = filters.HostFilterHandler('cinder.scheduler.'
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'filters')
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self.filter_classes = self.filter_handler.get_all_classes()
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self.weight_handler = weights.HostWeightHandler('cinder.scheduler.'
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'weights')
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self.weight_classes = self.weight_handler.get_all_classes()
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default_filters = ['AvailabilityZoneFilter',
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'CapacityFilter',
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'CapabilitiesFilter']
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chance = 'cinder.scheduler.chance.ChanceScheduler'
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simple = 'cinder.scheduler.simple.SimpleScheduler'
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if CONF.scheduler_driver == simple:
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CONF.set_override('scheduler_default_filters', default_filters)
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CONF.set_override('scheduler_default_weighers',
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['AllocatedCapacityWeigher'])
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elif CONF.scheduler_driver == chance:
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CONF.set_override('scheduler_default_filters', default_filters)
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CONF.set_override('scheduler_default_weighers',
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['ChanceWeigher'])
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else:
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# Do nothing when some other scheduler is configured
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pass
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def _choose_host_filters(self, filter_cls_names):
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"""Return a list of available filter names.
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This function checks input filter names against a predefined set
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of acceptable filterss (all loaded filters). If input is None,
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it uses CONF.scheduler_default_filters instead.
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"""
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if filter_cls_names is None:
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filter_cls_names = CONF.scheduler_default_filters
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if not isinstance(filter_cls_names, (list, tuple)):
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filter_cls_names = [filter_cls_names]
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good_filters = []
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bad_filters = []
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for filter_name in filter_cls_names:
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found_class = False
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for cls in self.filter_classes:
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if cls.__name__ == filter_name:
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found_class = True
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good_filters.append(cls)
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break
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if not found_class:
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bad_filters.append(filter_name)
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if bad_filters:
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msg = ", ".join(bad_filters)
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raise exception.SchedulerHostFilterNotFound(filter_name=msg)
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return good_filters
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def _choose_host_weighers(self, weight_cls_names):
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"""Return a list of available weigher names.
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This function checks input weigher names against a predefined set
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of acceptable weighers (all loaded weighers). If input is None,
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it uses CONF.scheduler_default_weighers instead.
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"""
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if weight_cls_names is None:
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weight_cls_names = CONF.scheduler_default_weighers
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if not isinstance(weight_cls_names, (list, tuple)):
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weight_cls_names = [weight_cls_names]
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good_weighers = []
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bad_weighers = []
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for weigher_name in weight_cls_names:
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found_class = False
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for cls in self.weight_classes:
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if cls.__name__ == weigher_name:
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good_weighers.append(cls)
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found_class = True
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break
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if not found_class:
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bad_weighers.append(weigher_name)
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if bad_weighers:
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msg = ", ".join(bad_weighers)
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raise exception.SchedulerHostWeigherNotFound(weigher_name=msg)
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return good_weighers
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def get_filtered_hosts(self, hosts, filter_properties,
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filter_class_names=None):
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"""Filter hosts and return only ones passing all filters."""
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filter_classes = self._choose_host_filters(filter_class_names)
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return self.filter_handler.get_filtered_objects(filter_classes,
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hosts,
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filter_properties)
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def get_weighed_hosts(self, hosts, weight_properties,
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weigher_class_names=None):
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"""Weigh the hosts."""
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weigher_classes = self._choose_host_weighers(weigher_class_names)
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return self.weight_handler.get_weighed_objects(weigher_classes,
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hosts,
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weight_properties)
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def update_service_capabilities(self, service_name, host, capabilities):
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"""Update the per-service capabilities based on this notification."""
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if service_name != 'volume':
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LOG.debug('Ignoring %(service_name)s service update '
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'from %(host)s',
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{'service_name': service_name, 'host': host})
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return
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# Copy the capabilities, so we don't modify the original dict
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capab_copy = dict(capabilities)
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capab_copy["timestamp"] = timeutils.utcnow() # Reported time
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self.service_states[host] = capab_copy
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LOG.debug("Received %(service_name)s service update from "
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"%(host)s: %(cap)s" %
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{'service_name': service_name, 'host': host,
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'cap': capabilities})
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def _update_host_state_map(self, context):
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# Get resource usage across the available volume nodes:
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topic = CONF.volume_topic
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volume_services = db.service_get_all_by_topic(context,
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topic,
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disabled=False)
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active_hosts = set()
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for service in volume_services:
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host = service['host']
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if not utils.service_is_up(service):
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LOG.warn(_LW("volume service is down. (host: %s)") % host)
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continue
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capabilities = self.service_states.get(host, None)
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host_state = self.host_state_map.get(host)
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if not host_state:
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host_state = self.host_state_cls(host,
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capabilities=capabilities,
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service=
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dict(service.iteritems()))
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self.host_state_map[host] = host_state
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# update capabilities and attributes in host_state
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host_state.update_from_volume_capability(capabilities,
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service=
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dict(service.iteritems()))
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active_hosts.add(host)
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# remove non-active hosts from host_state_map
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nonactive_hosts = set(self.host_state_map.keys()) - active_hosts
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for host in nonactive_hosts:
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LOG.info(_LI("Removing non-active host: %(host)s from "
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"scheduler cache.") % {'host': host})
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del self.host_state_map[host]
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def get_all_host_states(self, context):
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"""Returns a dict of all the hosts the HostManager knows about.
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Each of the consumable resources in HostState are
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populated with capabilities scheduler received from RPC.
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For example:
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{'192.168.1.100': HostState(), ...}
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"""
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self._update_host_state_map(context)
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# build a pool_state map and return that map instead of host_state_map
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all_pools = {}
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for host, state in self.host_state_map.items():
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for key in state.pools:
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pool = state.pools[key]
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# use host.pool_name to make sure key is unique
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pool_key = '.'.join([host, pool.pool_name])
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all_pools[pool_key] = pool
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return all_pools.itervalues()
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def get_pools(self, context):
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"""Returns a dict of all pools on all hosts HostManager knows about."""
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self._update_host_state_map(context)
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all_pools = []
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for host, state in self.host_state_map.items():
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for key in state.pools:
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pool = state.pools[key]
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# use host.pool_name to make sure key is unique
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pool_key = vol_utils.append_host(host, pool.pool_name)
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new_pool = dict(name=pool_key)
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new_pool.update(dict(capabilities=pool.capabilities))
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all_pools.append(new_pool)
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|
|
|
return all_pools
|