def select_hosts(self, context, request_spec, filter_properties):
"""Selects a filtered set of hosts."""
instance_uuids = request_spec.get('instance_uuids')
hosts = [
host.obj.host for host in self._schedule(
context, request_spec, filter_properties, instance_uuids)
]
if not hosts:
raise exception.NoValidHost(reason="")
return hosts
def test_select_hosts_throws_rpc_clientexception(self):
self.mox.StubOutWithMock(self.manager.driver, 'select_hosts')
self.manager.driver.select_hosts(self.context, {}, {}).AndRaise(
exception.NoValidHost(reason=""))
self.mox.ReplayAll()
self.assertRaises(rpc_common.ClientException,
self.manager.select_hosts,
self.context, {}, {})
def _get_group_details(context, instance_uuid, user_group_hosts=None):
"""Provide group_hosts and group_policies sets related to instances if
those instances are belonging to a group and if corresponding filters are
enabled.
:param instance_uuid: UUID of the instance to check
:param user_group_hosts: Hosts from the group or empty set
:returns: None or namedtuple GroupDetails
"""
global _SUPPORTS_AFFINITY
if _SUPPORTS_AFFINITY is None:
_SUPPORTS_AFFINITY = validate_filter(
'ServerGroupAffinityFilter')
global _SUPPORTS_ANTI_AFFINITY
if _SUPPORTS_ANTI_AFFINITY is None:
_SUPPORTS_ANTI_AFFINITY = validate_filter(
'ServerGroupAntiAffinityFilter')
_supports_server_groups = any((_SUPPORTS_AFFINITY,
_SUPPORTS_ANTI_AFFINITY))
if not _supports_server_groups or not instance_uuid:
return
try:
group = objects.InstanceGroup.get_by_instance_uuid(context,
instance_uuid)
except exception.InstanceGroupNotFound:
return
policies = set(('anti-affinity', 'affinity'))
if any((policy in policies) for policy in group.policies):
if (not _SUPPORTS_AFFINITY and 'affinity' in group.policies):
msg = _("ServerGroupAffinityFilter not configured")
LOG.error(msg)
raise exception.NoValidHost(reason=msg)
if (not _SUPPORTS_ANTI_AFFINITY and 'anti-affinity' in group.policies):
msg = _("ServerGroupAntiAffinityFilter not configured")
LOG.error(msg)
raise exception.NoValidHost(reason=msg)
group_hosts = set(group.get_hosts(context))
user_hosts = set(user_group_hosts) if user_group_hosts else set()
return GroupDetails(hosts=user_hosts | group_hosts,
policies=group.policies)
def test_select_hosts_throws_rpc_clientexception(self):
self.mox.StubOutWithMock(self.manager.driver, 'select_destinations')
self.manager.driver.select_destinations(self.context, {}, {}).AndRaise(
exception.NoValidHost(reason=""))
self.mox.ReplayAll()
self.assertRaises(messaging.ExpectedException,
self.manager.select_hosts,
self.context, {}, {})
def select_hosts(self, context, request_spec, filter_properties):
"""Selects a set of random hosts."""
hosts = [
self._schedule(context, CONF.compute_topic, request_spec,
filter_properties)
for instance_uuid in request_spec.get('instance_uuids', [])
]
if not hosts:
raise exception.NoValidHost(reason="")
return hosts
def schedule_run_instance(self, context, request_spec,
admin_password, injected_files,
requested_networks, is_first_time,
filter_properties):
"""This method is called from nova.compute.api to provision
an instance. We first create a build plan (a list of WeightedHosts)
and then provision.
Returns a list of the instances created.
"""
instance_uuids = request_spec.get('instance_uuids')
num_instances = len(instance_uuids)
LOG.debug(_("Attempting to build %(num_instances)d instance(s)") %
locals())
payload = dict(request_spec=request_spec)
notifier.notify(context, notifier.publisher_id("scheduler"),
'scheduler.run_instance.start', notifier.INFO, payload)
weighed_hosts = self._schedule(context, request_spec,
filter_properties, instance_uuids)
# NOTE(comstud): Make sure we do not pass this through. It
# contains an instance of RpcContext that cannot be serialized.
filter_properties.pop('context', None)
for num, instance_uuid in enumerate(instance_uuids):
request_spec['instance_properties']['launch_index'] = num
try:
try:
weighed_host = weighed_hosts.pop(0)
except IndexError:
raise exception.NoValidHost(reason="")
self._provision_resource(context, weighed_host,
request_spec,
filter_properties,
requested_networks,
injected_files, admin_password,
is_first_time,
instance_uuid=instance_uuid)
except Exception as ex:
# NOTE(vish): we don't reraise the exception here to make sure
# that all instances in the request get set to
# error properly
driver.handle_schedule_error(context, ex, instance_uuid,
request_spec)
# scrub retry host list in case we're scheduling multiple
# instances:
retry = filter_properties.get('retry', {})
retry['hosts'] = []
notifier.notify(context, notifier.publisher_id("scheduler"),
'scheduler.run_instance.end', notifier.INFO, payload)
def _schedule(self, context, topic, spec_obj, instance_uuids):
"""Picks a host that is up at random."""
elevated = context.elevated()
hosts = self.hosts_up(elevated, topic)
if not hosts:
msg = _("Is the appropriate service running?")
raise exception.NoValidHost(reason=msg)
hosts = self._filter_hosts(hosts, spec_obj)
if not hosts:
msg = _("Could not find another compute")
raise exception.NoValidHost(reason=msg)
num_instances = len(instance_uuids)
selected_host_lists = []
# If possible, we'd like to return distinct hosts for each instance.
# But when there are fewer available hosts than requested instances, we
# will need to return some duplicates.
if len(hosts) >= num_instances:
selected_hosts = random.sample(hosts, num_instances)
else:
selected_hosts = [
random.choice(hosts) for i in range(num_instances)
]
# We can't return dupes as alternates, since alternates are used when
# building to the selected host fails.
alts_per_instance = min(len(hosts), CONF.scheduler.max_attempts)
for sel_host in selected_hosts:
sel_plus_alts = [sel_host]
while len(sel_plus_alts) < alts_per_instance:
candidate = random.choice(hosts)
if (candidate
not in sel_plus_alts) and (candidate
not in selected_hosts):
# We don't want to include a selected host as an alternate,
# as it will have a high likelihood of not having enough
# resources left after it has an instance built on it.
sel_plus_alts.append(candidate)
selected_host_lists.append(sel_plus_alts)
return selected_host_lists
def test_create_volume_no_valid_host_puts_volume_in_error(self):
self._mox_schedule_method_helper('schedule_create_volume')
self.mox.StubOutWithMock(db, 'volume_update')
self.manager.driver.schedule_create_volume(self.context, '1', '2',
None).AndRaise(exception.NoValidHost(reason=''))
db.volume_update(self.context, '1', {'status': 'error'})
self.mox.ReplayAll()
self.assertRaises(exception.NoValidHost, self.manager.create_volume,
self.context, '1', '2')
def _check_not_over_max_retries(self, attempted_hosts):
if CONF.migrate_max_retries == -1:
return
retries = len(attempted_hosts) - 1
if retries > CONF.migrate_max_retries:
msg = (_('Exceeded max scheduling retries %(max_retries)d for '
'instance %(instance_uuid)s during live migration')
% {'max_retries': retries,
'instance_uuid': self.instance.uuid})
raise exception.NoValidHost(reason=msg)
def schedule_run_instance(self, context, request_spec, admin_password,
injected_files, requested_networks,
is_first_time, filter_properties, reservations):
"""This method is called from nova.compute.api to provision
an instance. We first create a build plan (a list of WeightedHosts)
and then provision.
Returns a list of the instances created.
"""
elevated = context.elevated()
num_instances = request_spec.get('num_instances', 1)
LOG.debug(
_("Attempting to build %(num_instances)d instance(s)") % locals())
payload = dict(request_spec=request_spec)
notifier.notify(context, notifier.publisher_id("scheduler"),
'scheduler.run_instance.start', notifier.INFO, payload)
weighted_hosts = self._schedule(context, "compute", request_spec,
filter_properties)
if not weighted_hosts:
raise exception.NoValidHost(reason="")
# NOTE(comstud): Make sure we do not pass this through. It
# contains an instance of RpcContext that cannot be serialized.
filter_properties.pop('context', None)
instances = []
for num in xrange(num_instances):
if not weighted_hosts:
break
weighted_host = weighted_hosts.pop(0)
request_spec['instance_properties']['launch_index'] = num
instance = self._provision_resource(elevated, weighted_host,
request_spec, reservations,
filter_properties,
requested_networks,
injected_files, admin_password,
is_first_time)
# scrub retry host list in case we're scheduling multiple
# instances:
retry = filter_properties.get('retry', {})
retry['hosts'] = []
if instance:
instances.append(instance)
notifier.notify(context, notifier.publisher_id("scheduler"),
'scheduler.run_instance.end', notifier.INFO, payload)
return instances
def _cold_migrate(self, context, instance, flavor, filter_properties,
reservations):
image_ref = instance.image_ref
image = compute_utils.get_image_metadata(
context, self.image_api, image_ref, instance)
request_spec = scheduler_utils.build_request_spec(
context, image, [instance], instance_type=flavor)
quotas = objects.Quotas.from_reservations(context,
reservations,
instance=instance)
try:
scheduler_utils.populate_retry(filter_properties, instance['uuid'])
hosts = self.scheduler_rpcapi.select_destinations(
context, request_spec, filter_properties)
host_state = hosts[0]
except exception.NoValidHost as ex:
vm_state = instance['vm_state']
if not vm_state:
vm_state = vm_states.ACTIVE
updates = {'vm_state': vm_state, 'task_state': None}
self._set_vm_state_and_notify(context, 'migrate_server',
updates, ex, request_spec)
quotas.rollback()
msg = _("No valid host found for cold migrate")
raise exception.NoValidHost(reason=msg)
try:
scheduler_utils.populate_filter_properties(filter_properties,
host_state)
# context is not serializable
filter_properties.pop('context', None)
# TODO(timello): originally, instance_type in request_spec
# on compute.api.resize does not have 'extra_specs', so we
# remove it for now to keep tests backward compatibility.
request_spec['instance_type'].pop('extra_specs')
(host, node) = (host_state['host'], host_state['nodename'])
self.compute_rpcapi.prep_resize(
context, image, instance,
flavor, host,
reservations, request_spec=request_spec,
filter_properties=filter_properties, node=node)
except Exception as ex:
with excutils.save_and_reraise_exception():
updates = {'vm_state': instance['vm_state'],
'task_state': None}
self._set_vm_state_and_notify(context, 'migrate_server',
updates, ex, request_spec)
quotas.rollback()
def test_find_destination_when_runs_out_of_hosts(self):
self.mox.StubOutWithMock(scheduler_utils, 'setup_instance_group')
self.mox.StubOutWithMock(self.task.scheduler_client,
'select_destinations')
scheduler_utils.setup_instance_group(self.context, self.fake_spec)
self.task.scheduler_client.select_destinations(self.context,
self.fake_spec, [self.instance.uuid], return_objects=True,
return_alternates=False).AndRaise(
exception.NoValidHost(reason=""))
self.mox.ReplayAll()
self.assertRaises(exception.NoValidHost, self.task._find_destination)
def _cold_migrate(self, context, instance, flavor, filter_properties,
reservations, clean_shutdown, request_spec):
image = utils.get_image_from_system_metadata(
instance.system_metadata)
# NOTE(sbauza): If a reschedule occurs when prep_resize(), then
# it only provides filter_properties legacy dict back to the
# conductor with no RequestSpec part of the payload.
if not request_spec:
request_spec = objects.RequestSpec.from_components(
context, instance.uuid, image,
instance.flavor, instance.numa_topology, instance.pci_requests,
filter_properties, None, instance.availability_zone)
task = self._build_cold_migrate_task(context, instance, flavor,
request_spec,
reservations, clean_shutdown)
# TODO(sbauza): Provide directly the RequestSpec object once
# _set_vm_state_and_notify() accepts it
legacy_spec = request_spec.to_legacy_request_spec_dict()
try:
task.execute()
except exception.NoValidHost as ex:
vm_state = instance.vm_state
if not vm_state:
vm_state = vm_states.ACTIVE
updates = {'vm_state': vm_state, 'task_state': None}
self._set_vm_state_and_notify(context, instance.uuid,
'migrate_server',
updates, ex, legacy_spec)
# if the flavor IDs match, it's migrate; otherwise resize
if flavor.id == instance.instance_type_id:
msg = _("No valid host found for cold migrate")
else:
msg = _("No valid host found for resize")
raise exception.NoValidHost(reason=msg)
except exception.UnsupportedPolicyException as ex:
with excutils.save_and_reraise_exception():
vm_state = instance.vm_state
if not vm_state:
vm_state = vm_states.ACTIVE
updates = {'vm_state': vm_state, 'task_state': None}
self._set_vm_state_and_notify(context, instance.uuid,
'migrate_server',
updates, ex, legacy_spec)
except Exception as ex:
with excutils.save_and_reraise_exception():
updates = {'vm_state': instance.vm_state,
'task_state': None}
self._set_vm_state_and_notify(context, instance.uuid,
'migrate_server',
updates, ex, legacy_spec)
def host_maintenance_mode(self, host, mode):
"""Start/Stop host maintenance window. On start, it triggers
guest VMs evacuation."""
if mode:
host_list = [host_ref for host_ref in
self._session.call_xenapi('host.get_all') \
if host_ref != self._session.get_xenapi_host()]
migrations_counter = vm_counter = 0
ctxt = context.get_admin_context()
for vm_ref, vm_rec in vm_utils.VMHelper.list_vms(self._session):
for host_ref in host_list:
try:
# Ensure only guest instances are migrated
uuid = vm_rec['other_config'].get('nova_uuid')
if not uuid:
name = vm_rec['name_label']
uuid = _uuid_find(ctxt, host, name)
if not uuid:
msg = _('Instance %(name)s running on %(host)s'
' could not be found in the database:'
' assuming it is a worker VM and skip'
'ping migration to a new host')
LOG.info(msg % locals())
continue
instance = db.instance_get_by_uuid(ctxt, uuid)
vm_counter = vm_counter + 1
dest = _host_find(ctxt, self._session, host, host_ref)
db.instance_update(ctxt, instance.id, {
'host': dest,
'vm_state': vm_states.MIGRATING
})
self._session.call_xenapi('VM.pool_migrate', vm_ref,
host_ref, {})
migrations_counter = migrations_counter + 1
db.instance_update(ctxt, instance.id,
{'vm_state': vm_states.ACTIVE})
break
except self.XenAPI.Failure:
LOG.exception('Unable to migrate VM %(vm_ref)s'
'from %(host)s' % locals())
db.instance_update(ctxt, instance.id, {
'host': host,
'vm_state': vm_states.ACTIVE
})
if vm_counter == migrations_counter:
return 'on_maintenance'
else:
raise exception.NoValidHost(reason='Unable to find suitable '
'host for VMs evacuation')
else:
return 'off_maintenance'
def schedule_create_volume(self, context, volume_id, *_args, **_kwargs):
"""Picks a host that is up and has the fewest volumes."""
elevated = context.elevated()
volume_ref = db.volume_get(context, volume_id)
availability_zone = volume_ref.get('availability_zone')
zone, host = None, None
if availability_zone:
zone, _x, host = availability_zone.partition(':')
if host and context.is_admin:
service = db.service_get_by_args(elevated, host, 'nova-volume')
if not utils.service_is_up(service):
raise exception.WillNotSchedule(host=host)
driver.cast_to_volume_host(context,
host,
'create_volume',
volume_id=volume_id,
**_kwargs)
return None
results = db.service_get_all_volume_sorted(elevated)
if zone:
results = [(service, gigs) for (service, gigs) in results
if service['availability_zone'] == zone]
for result in results:
(service, volume_gigabytes) = result
if volume_gigabytes + volume_ref['size'] > FLAGS.max_gigabytes:
msg = _("Not enough allocatable volume gigabytes remaining")
raise exception.NoValidHost(reason=msg)
if utils.service_is_up(service) and not service['disabled']:
driver.cast_to_volume_host(context,
service['host'],
'create_volume',
volume_id=volume_id,
**_kwargs)
return None
msg = _("Is the appropriate service running?")
raise exception.NoValidHost(reason=msg)
def _schedule_instance(self, context, instance_opts, *_args, **_kwargs):
"""Picks a host that is up and has the fewest running instances."""
elevated = context.elevated()
availability_zone = instance_opts.get('availability_zone')
zone, host = FLAGS.default_schedule_zone, None
if availability_zone:
zone, _x, host = availability_zone.partition(':')
if host and context.is_admin:
service = db.service_get_by_args(elevated, host, 'nova-compute')
if not utils.service_is_up(service):
raise exception.WillNotSchedule(host=host)
return host
results = db.service_get_all_compute_sorted(elevated)
in_isolation = instance_opts['image_ref'] in FLAGS.isolated_images
check_cores = not in_isolation or not FLAGS.skip_isolated_core_check
if zone:
results = [(service, cores) for (service, cores) in results
if service['availability_zone'] == zone]
for result in results:
(service, instance_cores) = result
if in_isolation and service['host'] not in FLAGS.isolated_hosts:
# isloated images run on isolated hosts
continue
if service['host'] in FLAGS.isolated_hosts and not in_isolation:
# images that aren't isolated only run on general hosts
continue
if (check_cores and
instance_cores + instance_opts['vcpus'] > FLAGS.max_cores):
msg = _("Not enough allocatable CPU cores remaining")
raise exception.NoValidHost(reason=msg)
if utils.service_is_up(service) and not service['disabled']:
return service['host']
msg = _("Is the appropriate service running?")
raise exception.NoValidHost(reason=msg)
def schedule_run_instance(self, context, request_spec, *args, **kwargs):
"""This method is called from nova.compute.api to provision
an instance. However we need to look at the parameters being
passed in to see if this is a request to:
1. Create build plan (a list of WeightedHosts) and then provision, or
2. Use the WeightedHost information in the request parameters
to simply create the instance (either in this zone or
a child zone).
returns a list of the instances created.
"""
elevated = context.elevated()
num_instances = request_spec.get('num_instances', 1)
LOG.debug(_("Attempting to build %(num_instances)d instance(s)") %
locals())
weighted_hosts = []
# Having a 'blob' hint means we've already provided a build plan.
# We need to turn this back into a WeightedHost object.
blob = request_spec.get('blob', None)
if blob:
weighted_hosts.append(self._make_weighted_host_from_blob(blob))
else:
# No plan ... better make one.
weighted_hosts = self._schedule(elevated, "compute", request_spec,
*args, **kwargs)
if not weighted_hosts:
raise exception.NoValidHost(reason=_(""))
instances = []
for num in xrange(num_instances):
if not weighted_hosts:
break
weighted_host = weighted_hosts.pop(0)
instance = None
if weighted_host.host:
instance = self._provision_resource_locally(elevated,
weighted_host, request_spec, kwargs)
else:
instance = self._ask_child_zone_to_create_instance(elevated,
weighted_host, request_spec, kwargs)
if instance:
instances.append(instance)
return instances
def select_destinations(self,
ctxt,
request_spec=None,
filter_properties=None,
spec_obj=_sentinel,
instance_uuids=None):
"""Returns destinations(s) best suited for this RequestSpec.
The result should be a list of dicts with 'host', 'nodename' and
'limits' as keys.
"""
LOG.debug("Starting to schedule for instances: %s", instance_uuids)
# TODO(sbauza): Change the method signature to only accept a spec_obj
# argument once API v5 is provided.
if spec_obj is self._sentinel:
spec_obj = objects.RequestSpec.from_primitives(
ctxt, request_spec, filter_properties)
resources = utils.resources_from_request_spec(spec_obj)
alloc_reqs_by_rp_uuid, provider_summaries = None, None
if self.driver.USES_ALLOCATION_CANDIDATES:
res = self.placement_client.get_allocation_candidates(resources)
if res is None:
# We have to handle the case that we failed to connect to the
# Placement service and the safe_connect decorator on
# get_allocation_candidates returns None.
alloc_reqs, provider_summaries = None, None
else:
alloc_reqs, provider_summaries = res
if not alloc_reqs:
LOG.debug("Got no allocation candidates from the Placement "
"API. This may be a temporary occurrence as compute "
"nodes start up and begin reporting inventory to "
"the Placement service.")
raise exception.NoValidHost(reason="")
else:
# Build a dict of lists of allocation requests, keyed by
# provider UUID, so that when we attempt to claim resources for
# a host, we can grab an allocation request easily
alloc_reqs_by_rp_uuid = collections.defaultdict(list)
for ar in alloc_reqs:
for rr in ar['allocations']:
rp_uuid = rr['resource_provider']['uuid']
alloc_reqs_by_rp_uuid[rp_uuid].append(ar)
dests = self.driver.select_destinations(ctxt, spec_obj, instance_uuids,
alloc_reqs_by_rp_uuid,
provider_summaries)
dest_dicts = [_host_state_obj_to_dict(d) for d in dests]
return jsonutils.to_primitive(dest_dicts)
def select_destinations(self, context, request_spec, filter_properties):
"""Selects a filtered set of hosts and nodes."""
num_instances = request_spec['num_instances']
instance_uuids = request_spec.get('instance_uuids')
selected_hosts = self._schedule(context, request_spec,
filter_properties, instance_uuids)
# Couldn't fulfill the request_spec
if len(selected_hosts) < num_instances:
raise exception.NoValidHost(reason='')
dests = [dict(host=host.obj.host, nodename=host.obj.nodename,
limits=host.obj.limits) for host in selected_hosts]
return dests
def test_find_destination_when_runs_out_of_hosts(self):
self.mox.StubOutWithMock(utils, 'get_image_from_system_metadata')
self.mox.StubOutWithMock(scheduler_utils, 'setup_instance_group')
self.mox.StubOutWithMock(self.task.scheduler_client,
'select_destinations')
utils.get_image_from_system_metadata(
self.instance.system_metadata).AndReturn("image")
scheduler_utils.setup_instance_group(self.context, self.fake_spec)
self.task.scheduler_client.select_destinations(
self.context, self.fake_spec,
[self.instance.uuid]).AndRaise(exception.NoValidHost(reason=""))
self.mox.ReplayAll()
self.assertRaises(exception.NoValidHost, self.task._find_destination)
def select_destinations(self, context, request_spec, filter_properties):
try:
return super(HuaweiFilterScheduler,
self).select_destinations(context, request_spec,
filter_properties)
except exception.NoValidHost:
reason = ''
if '__tracker' in filter_properties:
LOG.debug('generate trace before raise')
tracker = filter_properties.pop('__tracker')
reason = ('Filter traceback: %s' % tracker.to_string())
raise exception.NoValidHost(reason=reason)
def test_migrate_live_unexpected_error(self):
exc = exception.NoValidHost(reason="No valid host found")
self.mox.StubOutWithMock(self.compute_api, 'live_migrate')
instance = self._stub_instance_get()
self.compute_api.live_migrate(self.context, instance, None,
self.disk_over_commit, 'hostname',
self.force, self.async).AndRaise(exc)
self.mox.ReplayAll()
body = {'os-migrateLive':
{'host': 'hostname', 'block_migration': 'auto'}}
self.assertRaises(webob.exc.HTTPInternalServerError,
self.controller._migrate_live,
self.req, instance.uuid, body=body)
def select_destinations(self, context, request_spec, filter_properties):
"""Selects random destinations."""
num_instances = request_spec['num_instances']
# NOTE(timello): Returns a list of dicts with 'host', 'nodename' and
# 'limits' as keys for compatibility with filter_scheduler.
dests = []
for i in range(num_instances):
host = self._schedule(context, CONF.compute_topic, request_spec,
filter_properties)
host_state = dict(host=host, nodename=None, limits=None)
dests.append(host_state)
if len(dests) < num_instances:
raise exception.NoValidHost(reason='')
return dests
def select_destinations(self, context, spec_obj):
"""Selects random destinations."""
num_instances = spec_obj.num_instances
# NOTE(timello): Returns a list of dicts with 'host', 'nodename' and
# 'limits' as keys for compatibility with filter_scheduler.
dests = []
for i in range(num_instances):
host = self._schedule(context, CONF.compute_topic, spec_obj)
host_state = dict(host=host, nodename=None, limits=None)
dests.append(host_state)
if len(dests) < num_instances:
reason = _('There are not enough hosts available.')
raise exception.NoValidHost(reason=reason)
return dests
def select_destinations(self, ctxt, request_spec, filter_properties):
self.host_manager.reload_aggregates(ctxt)
availability_zone = self.host_manager.get_availability_zone(
request_spec[u'instance_properties'][u'availability_zone'])
for site in availability_zone.valid_sites:
site.prepare_for_instance(request_spec, filter_properties)
return [{
'host': site.name,
'nodename': site.get_nodes()[0].hypervisor_hostname,
'limits': None,
}]
else:
raise exception.NoValidHost(
"No sites match requested availability zone")
def get_host_ref(session, cluster=None):
"""Get reference to a host within the cluster specified."""
if cluster is None:
results = session._call_method(vim_util, "get_objects", "HostSystem")
_cancel_retrieve_if_necessary(session, results)
host_mor = results.objects[0].obj
else:
host_ret = session._call_method(vim_util, "get_dynamic_property",
cluster, "ClusterComputeResource",
"host")
if not host_ret or not host_ret.ManagedObjectReference:
msg = _('No host available on cluster')
raise exception.NoValidHost(reason=msg)
host_mor = host_ret.ManagedObjectReference[0]
return host_mor
def test_find_destination_when_runs_out_of_hosts(self):
self.mox.StubOutWithMock(self.task.image_service, 'show')
self.mox.StubOutWithMock(flavors, 'extract_flavor')
self.mox.StubOutWithMock(self.task.scheduler_rpcapi, 'select_hosts')
self.mox.StubOutWithMock(self.task,
'_check_compatible_with_source_hypervisor')
self.mox.StubOutWithMock(self.task, '_call_livem_checks_on_host')
self.task.image_service.show(self.context,
self.instance_image).AndReturn("image")
flavors.extract_flavor(self.instance).AndReturn("inst_type")
self.task.scheduler_rpcapi.select_hosts(self.context, mox.IgnoreArg(),
mox.IgnoreArg()).AndRaise(exception.NoValidHost(reason=""))
self.mox.ReplayAll()
self.assertRaises(exception.NoValidHost, self.task._find_destination)
def test_find_destination_when_runs_out_of_hosts(self):
self.mox.StubOutWithMock(compute_utils, 'get_image_metadata')
self.mox.StubOutWithMock(scheduler_utils, 'build_request_spec')
self.mox.StubOutWithMock(self.task.scheduler_rpcapi,
'select_destinations')
compute_utils.get_image_metadata(self.context, self.task.image_service,
self.instance_image,
self.instance).AndReturn("image")
scheduler_utils.build_request_spec(self.context, mox.IgnoreArg(),
mox.IgnoreArg()).AndReturn({})
self.task.scheduler_rpcapi.select_destinations(
self.context, mox.IgnoreArg(),
mox.IgnoreArg()).AndRaise(exception.NoValidHost(reason=""))
self.mox.ReplayAll()
self.assertRaises(exception.NoValidHost, self.task._find_destination)
def select_destinations(self, context, request_spec, filter_properties):
"""Selects a filtered set of hosts and nodes."""
# TODO(sbauza): Change the select_destinations method to accept a
# RequestSpec object directly (and add a new RPC API method for passing
# a RequestSpec object over the wire)
spec_obj = objects.RequestSpec.from_primitives(context, request_spec,
filter_properties)
self.notifier.info(
context, 'scheduler.select_destinations.start',
dict(request_spec=spec_obj.to_legacy_request_spec_dict()))
num_instances = spec_obj.num_instances
selected_hosts = self._schedule(context, spec_obj)
# Couldn't fulfill the request_spec
if len(selected_hosts) < num_instances:
# NOTE(Rui Chen): If multiple creates failed, set the updated time
# of selected HostState to None so that these HostStates are
# refreshed according to database in next schedule, and release
# the resource consumed by instance in the process of selecting
# host.
for host in selected_hosts:
host.obj.updated = None
# Log the details but don't put those into the reason since
# we don't want to give away too much information about our
# actual environment.
LOG.debug(
'There are %(hosts)d hosts available but '
'%(num_instances)d instances requested to build.', {
'hosts': len(selected_hosts),
'num_instances': num_instances
})
reason = _('There are not enough hosts available.')
raise exception.NoValidHost(reason=reason)
dests = [
dict(host=host.obj.host,
nodename=host.obj.nodename,
limits=host.obj.limits) for host in selected_hosts
]
self.notifier.info(
context, 'scheduler.select_destinations.end',
dict(request_spec=spec_obj.to_legacy_request_spec_dict()))
return dests
def test_handle_schedule_error_adds_instance_fault(self):
instance = {'uuid': 'fake-uuid'}
self.mox.StubOutWithMock(db, 'instance_update_and_get_original')
self.mox.StubOutWithMock(db, 'instance_fault_create')
self.mox.StubOutWithMock(notifier, 'notify')
db.instance_update_and_get_original(self.context, instance['uuid'],
mox.IgnoreArg()).AndReturn(
(None, instance))
db.instance_fault_create(self.context, mox.IgnoreArg())
notifier.notify(self.context, mox.IgnoreArg(),
'scheduler.run_instance', notifier.ERROR,
mox.IgnoreArg())
self.mox.ReplayAll()
driver.handle_schedule_error(self.context,
exception.NoValidHost('test'),
instance['uuid'], {})