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# Copyright (c) 2012 Rackspace Hosting
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""
Cells Scheduler
"""
import copy
import time
from oslo_log import log as logging
from six.moves import range
from nova.cells import filters
from nova.cells import weights
from nova import compute
from nova.compute import instance_actions
from nova.compute import vm_states
from nova import conductor
import nova.conf
from nova.db import base
from nova import exception
from nova import objects
from nova.objects import base as obj_base
from nova.scheduler import utils as scheduler_utils
from nova import utils
LOG = logging.getLogger(__name__)
CONF = nova.conf.CONF
class CellsScheduler(base.Base):
"""The cells scheduler."""
def __init__(self, msg_runner):
super(CellsScheduler, self).__init__()
self.msg_runner = msg_runner
self.state_manager = msg_runner.state_manager
self.compute_api = compute.API()
self.compute_task_api = conductor.ComputeTaskAPI()
self.filter_handler = filters.CellFilterHandler()
filter_classes = self.filter_handler.get_matching_classes(
CONF.cells.scheduler_filter_classes)
self.filters = [cls() for cls in filter_classes]
self.weight_handler = weights.CellWeightHandler()
weigher_classes = self.weight_handler.get_matching_classes(
CONF.cells.scheduler_weight_classes)
self.weighers = [cls() for cls in weigher_classes]
def _create_instances_here(self, ctxt, instance_uuids, instance_properties,
instance_type, image, security_groups, block_device_mapping):
instance_values = copy.copy(instance_properties)
# The parent may pass these metadata values as lists, and the
# create call expects it to be a dict.
instance_values['metadata'] = utils.instance_meta(instance_values)
# Pop out things that will get set properly when re-creating the
# instance record.
instance_values.pop('id')
instance_values.pop('name')
instance_values.pop('info_cache')
instance_values.pop('security_groups')
instance_values.pop('flavor')
# FIXME(danms): The instance was brutally serialized before being
# sent over RPC to us. Thus, the pci_requests value wasn't really
# sent in a useful form. Since it was getting ignored for cells
# before it was part of the Instance, skip it now until cells RPC
# is sending proper instance objects.
instance_values.pop('pci_requests', None)
# FIXME(danms): Same for ec2_ids
instance_values.pop('ec2_ids', None)
# FIXME(danms): Same for keypairs
instance_values.pop('keypairs', None)
instances = []
num_instances = len(instance_uuids)
security_groups = (
self.compute_api.security_group_api.populate_security_groups(
security_groups))
for i, instance_uuid in enumerate(instance_uuids):
instance = objects.Instance(context=ctxt)
instance.update(instance_values)
instance.uuid = instance_uuid
instance.flavor = instance_type
instance.old_flavor = None
instance.new_flavor = None
instance = self.compute_api.create_db_entry_for_new_instance(
ctxt,
instance_type,
image,
instance,
security_groups,
block_device_mapping,
num_instances, i)
block_device_mapping = (
self.compute_api._bdm_validate_set_size_and_instance(
ctxt, instance, instance_type, block_device_mapping))
self.compute_api._create_block_device_mapping(block_device_mapping)
instances.append(instance)
self.msg_runner.instance_update_at_top(ctxt, instance)
return instances
def _create_action_here(self, ctxt, instance_uuids):
for instance_uuid in instance_uuids:
objects.InstanceAction.action_start(
ctxt,
instance_uuid,
instance_actions.CREATE,
want_result=False)
def _get_possible_cells(self):
cells = self.state_manager.get_child_cells()
our_cell = self.state_manager.get_my_state()
# Include our cell in the list, if we have any capacity info
if not cells or our_cell.capacities:
cells.append(our_cell)
return cells
def _grab_target_cells(self, filter_properties):
cells = self._get_possible_cells()
cells = self.filter_handler.get_filtered_objects(self.filters, cells,
filter_properties)
# NOTE(comstud): I know this reads weird, but the 'if's are nested
# this way to optimize for the common case where 'cells' is a list
# containing at least 1 entry.
if not cells:
if cells is None:
# None means to bypass further scheduling as a filter
# took care of everything.
return
raise exception.NoCellsAvailable()
weighted_cells = self.weight_handler.get_weighed_objects(
self.weighers, cells, filter_properties)
LOG.debug("Weighted cells: %(weighted_cells)s",
{'weighted_cells': weighted_cells})
target_cells = [cell.obj for cell in weighted_cells]
return target_cells
def _build_instances(self, message, target_cells, instance_uuids,
build_inst_kwargs):
"""Attempt to build instance(s) or send msg to child cell."""
ctxt = message.ctxt
instance_properties = obj_base.obj_to_primitive(
build_inst_kwargs['instances'][0])
filter_properties = build_inst_kwargs['filter_properties']
instance_type = filter_properties['instance_type']
image = build_inst_kwargs['image']
security_groups = build_inst_kwargs['security_groups']
block_device_mapping = build_inst_kwargs['block_device_mapping']
LOG.debug("Building instances with routing_path=%(routing_path)s",
{'routing_path': message.routing_path})
for target_cell in target_cells:
try:
if target_cell.is_me:
# Need to create instance DB entries as the conductor
# expects that the instance(s) already exists.
instances = self._create_instances_here(ctxt,
instance_uuids, instance_properties, instance_type,
image, security_groups, block_device_mapping)
build_inst_kwargs['instances'] = instances
# Need to record the create action in the db as the
# conductor expects it to already exist.
self._create_action_here(ctxt, instance_uuids)
self.compute_task_api.build_instances(ctxt,
**build_inst_kwargs)
return
self.msg_runner.build_instances(ctxt, target_cell,
build_inst_kwargs)
return
except Exception:
LOG.exception("Couldn't communicate with cell '%s'",
target_cell.name)
# FIXME(comstud): Would be nice to kick this back up so that
# the parent cell could retry, if we had a parent.
LOG.error("Couldn't communicate with any cells")
raise exception.NoCellsAvailable()
def build_instances(self, message, build_inst_kwargs):
image = build_inst_kwargs['image']
instance_uuids = [inst['uuid'] for inst in
build_inst_kwargs['instances']]
instances = build_inst_kwargs['instances']
request_spec = scheduler_utils.build_request_spec(image, instances)
filter_properties = copy.copy(build_inst_kwargs['filter_properties'])
filter_properties.update({'context': message.ctxt,
'scheduler': self,
'routing_path': message.routing_path,
'host_sched_kwargs': build_inst_kwargs,
'request_spec': request_spec})
self._schedule_build_to_cells(message, instance_uuids,
filter_properties, self._build_instances, build_inst_kwargs)
def _schedule_build_to_cells(self, message, instance_uuids,
filter_properties, method, method_kwargs):
"""Pick a cell where we should create a new instance(s)."""
try:
for i in range(max(0, CONF.cells.scheduler_retries) + 1):
try:
target_cells = self._grab_target_cells(filter_properties)
if target_cells is None:
# a filter took care of scheduling. skip.
return
return method(message, target_cells, instance_uuids,
method_kwargs)
except exception.NoCellsAvailable:
if i == max(0, CONF.cells.scheduler_retries):
raise
sleep_time = max(1, CONF.cells.scheduler_retry_delay)
LOG.info("No cells available when scheduling. Will "
"retry in %(sleep_time)s second(s)",
{'sleep_time': sleep_time})
time.sleep(sleep_time)
continue
except Exception:
LOG.exception("Error scheduling instances %(instance_uuids)s",
{'instance_uuids': instance_uuids})
ctxt = message.ctxt
for instance_uuid in instance_uuids:
instance = objects.Instance(context=ctxt, uuid=instance_uuid,
vm_state=vm_states.ERROR)
self.msg_runner.instance_update_at_top(ctxt, instance)
try:
instance.vm_state = vm_states.ERROR
instance.save()
except Exception:
pass
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