def _update_allocations(self, dates_before, dates_after, reservation_id,
reservation_status, host_reservation, values):
min_hosts = self._convert_int_param(
values.get('min', host_reservation['count_range'].split('-')[0]),
'min')
max_hosts = self._convert_int_param(
values.get('max', host_reservation['count_range'].split('-')[1]),
'max')
if min_hosts < 0 or max_hosts < min_hosts:
raise manager_ex.InvalidRange()
hypervisor_properties = values.get(
'hypervisor_properties', host_reservation['hypervisor_properties'])
resource_properties = values.get(
'resource_properties', host_reservation['resource_properties'])
allocs = db_api.host_allocation_get_all_by_values(
reservation_id=reservation_id)
allocs_to_remove = self._allocations_to_remove(dates_before,
dates_after, max_hosts,
hypervisor_properties,
resource_properties,
allocs)
if (allocs_to_remove
and reservation_status == status.reservation.ACTIVE):
raise manager_ex.NotEnoughHostsAvailable()
kept_hosts = len(allocs) - len(allocs_to_remove)
if kept_hosts < max_hosts:
min_hosts = min_hosts - kept_hosts \
if (min_hosts - kept_hosts) > 0 else 0
max_hosts = max_hosts - kept_hosts
host_ids = self._matching_hosts(
hypervisor_properties, resource_properties,
str(min_hosts) + '-' + str(max_hosts),
dates_after['start_date'], dates_after['end_date'])
if len(host_ids) >= min_hosts:
pool = nova.ReservationPool()
for host_id in host_ids:
db_api.host_allocation_create({
'compute_host_id':
host_id,
'reservation_id':
reservation_id
})
if reservation_status == status.reservation.ACTIVE:
# Add new host into the aggregate.
new_host = db_api.host_get(host_id)
pool.add_computehost(host_reservation['aggregate_id'],
new_host['service_name'])
else:
raise manager_ex.NotEnoughHostsAvailable()
for allocation in allocs_to_remove:
db_api.host_allocation_destroy(allocation['id'])
def reserve_resource(self, reservation_id, values):
"""Create reservation."""
self._check_params(values)
host_ids = self._matching_hosts(
values['hypervisor_properties'],
values['resource_properties'],
values['count_range'],
values['start_date'],
values['end_date'],
)
if not host_ids:
raise manager_ex.NotEnoughHostsAvailable()
pool = nova.ReservationPool()
pool_name = reservation_id
az_name = "%s%s" % (CONF[self.resource_type].blazar_az_prefix,
pool_name)
pool_instance = pool.create(name=pool_name, az=az_name)
host_rsrv_values = {
'reservation_id': reservation_id,
'aggregate_id': pool_instance.id,
'resource_properties': values['resource_properties'],
'hypervisor_properties': values['hypervisor_properties'],
'count_range': values['count_range'],
'status': 'pending',
'before_end': values['before_end']
}
host_reservation = db_api.host_reservation_create(host_rsrv_values)
for host_id in host_ids:
db_api.host_allocation_create({'compute_host_id': host_id,
'reservation_id': reservation_id})
return host_reservation['id']
def pickup_hosts(self, reservation_id, values):
"""Returns lists of host ids to add/remove.
This function picks up available hosts, calculates the difference from
old reservations and returns a dict of a list of host ids to add
and remove keyed by "added" or "removed".
Note that the lists allow duplicated host ids for `affinity=True`
cases.
:raises: NotEnoughHostsAvailable exception if there are not enough
hosts available for the request
"""
req_amount = values['amount']
affinity = bool_from_string(values['affinity'], default=None)
query_params = {
'cpus': values['vcpus'],
'memory': values['memory_mb'],
'disk': values['disk_gb'],
'resource_properties': values['resource_properties'],
'start_date': values['start_date'],
'end_date': values['end_date']
}
old_allocs = db_api.host_allocation_get_all_by_values(
reservation_id=reservation_id)
if old_allocs:
# This is a path for *update* reservation. Add the specific
# query param not to consider resources reserved by existing
# reservations to update
query_params['excludes_res'] = [reservation_id]
new_hosts = self.query_available_hosts(**query_params)
old_host_id_list = [h['compute_host_id'] for h in old_allocs]
candidate_id_list = [h['id'] for h in new_hosts]
# Build `new_host_id_list`. Note that we'd like to pick up hosts in
# the following order of priority:
# 1. hosts reserved by the reservation to update
# 2. hosts with reservations followed by hosts without reservations
# Note that the `candidate_id_list` has already been ordered
# satisfying the second requirement.
if affinity:
host_id_map = collections.Counter(candidate_id_list)
available = {k for k, v in host_id_map.items() if v >= req_amount}
if not available:
raise mgr_exceptions.NotEnoughHostsAvailable()
new_host_ids = set(old_host_id_list) & available
if new_host_ids:
# (priority 1) This is a path for update reservation. We pick
# up a host from hosts reserved by the reservation to update.
new_host_id = new_host_ids.pop()
else:
# (priority 2) This is a path both for update and for new
# reservation. We pick up hosts with some other reservations
# if possible and otherwise pick up hosts without any
# reservation. We can do so by considering the order of the
# `candidate_id_list`.
for host_id in candidate_id_list:
if host_id in available:
new_host_id = host_id
break
new_host_id_list = [new_host_id] * req_amount
else:
# Hosts that can accommodate but don't satisfy priority 1
_, possible_host_list = plugins_utils.list_difference(
old_host_id_list, candidate_id_list)
# Hosts that satisfy priority 1
new_host_id_list, _ = plugins_utils.list_difference(
candidate_id_list, possible_host_list)
if affinity is False:
# Eliminate the duplication
new_host_id_list = list(set(new_host_id_list))
for host_id in possible_host_list:
if (affinity is False) and (host_id in new_host_id_list):
# Eliminate the duplication
continue
new_host_id_list.append(host_id)
if len(new_host_id_list) < req_amount:
raise mgr_exceptions.NotEnoughHostsAvailable()
while len(new_host_id_list) > req_amount:
new_host_id_list.pop()
# Calculate the difference from the existing reserved host
removed_host_ids, added_host_ids = plugins_utils.list_difference(
old_host_id_list, new_host_id_list)
return {'added': added_host_ids, 'removed': removed_host_ids}
def update_reservation(self, reservation_id, new_values):
"""Updates an instance reservation with requested parameters.
This method allows users to update an instance reservation under the
following conditions.
- If an instance reservation has not started yet
- vcpus, memory_mb disk_gb and amount can be updateable unless
Blazar can accommodate the new request.
- If an instance reservation has already started
- only amount is increasable.
"""
# TODO(masahito) the instance reservation plugin only supports
# anti-affinity rule in short-term goal.
if bool_from_string(new_values.get('affinity', None)):
raise mgr_exceptions.MalformedParameter(
param='affinity (only affinity = False is supported)')
reservation = db_api.reservation_get(reservation_id)
lease = db_api.lease_get(reservation['lease_id'])
updatable = ['vcpus', 'memory_mb', 'disk_gb', 'affinity', 'amount',
'resource_properties']
if (not any([k in updatable for k in new_values.keys()])
and new_values['start_date'] >= lease['start_date']
and new_values['end_date'] <= lease['end_date']):
# no update because of just shortening the reservation time
return
if (reservation['status'] == 'active' and
any([k in updatable[:-1] for k in new_values.keys()])):
msg = "An active reservation only accepts to update amount."
raise mgr_exceptions.InvalidStateUpdate(msg)
if reservation['status'] == 'error':
msg = "An error reservation doesn't accept an updating request."
raise mgr_exceptions.InvalidStateUpdate(msg)
for key in updatable:
if key not in new_values:
new_values[key] = reservation[key]
changed_hosts = self.pickup_hosts(reservation_id, new_values)
if (reservation['status'] == 'active'
and len(changed_hosts['removed']) > 0):
err_msg = ("Instance reservation doesn't allow to reduce/replace "
"reserved instance slots when the reservation is in "
"active status.")
raise mgr_exceptions.CantUpdateParameter(err_msg)
if (new_values['amount'] - reservation['amount'] !=
(len(changed_hosts['added']) - len(changed_hosts['removed']))):
raise mgr_exceptions.NotEnoughHostsAvailable()
db_api.instance_reservation_update(
reservation['resource_id'],
{key: new_values[key] for key in updatable})
self.update_host_allocations(changed_hosts['added'],
changed_hosts['removed'],
reservation_id)
try:
self.update_resources(reservation_id)
except mgr_exceptions.NovaClientError:
raise
