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.UnsupportedPolicyException(reason=msg)
if (not _SUPPORTS_ANTI_AFFINITY and 'anti-affinity' in group.policies):
msg = _("ServerGroupAntiAffinityFilter not configured")
LOG.error(msg)
raise exception.UnsupportedPolicyException(reason=msg)
group_hosts = set(group.get_hosts())
user_hosts = set(user_group_hosts) if user_group_hosts else set()
return GroupDetails(hosts=user_hosts | group_hosts,
policies=group.policies)
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')
global _SUPPORTS_SOFT_AFFINITY
if _SUPPORTS_SOFT_AFFINITY is None:
_SUPPORTS_SOFT_AFFINITY = validate_weigher(
'nova.scheduler.weights.affinity.ServerGroupSoftAffinityWeigher')
global _SUPPORTS_SOFT_ANTI_AFFINITY
if _SUPPORTS_SOFT_ANTI_AFFINITY is None:
_SUPPORTS_SOFT_ANTI_AFFINITY = validate_weigher(
'nova.scheduler.weights.affinity.'
'ServerGroupSoftAntiAffinityWeigher')
if not instance_uuid:
return
try:
group = objects.InstanceGroup.get_by_instance_uuid(
context, instance_uuid)
except exception.InstanceGroupNotFound:
return
policies = set(
('anti-affinity', 'affinity', 'soft-affinity', 'soft-anti-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.UnsupportedPolicyException(reason=msg)
if not _SUPPORTS_ANTI_AFFINITY and 'anti-affinity' in group.policies:
msg = _("ServerGroupAntiAffinityFilter not configured")
LOG.error(msg)
raise exception.UnsupportedPolicyException(reason=msg)
if (not _SUPPORTS_SOFT_AFFINITY and 'soft-affinity' in group.policies):
msg = _("ServerGroupSoftAffinityWeigher not configured")
LOG.error(msg)
raise exception.UnsupportedPolicyException(reason=msg)
if (not _SUPPORTS_SOFT_ANTI_AFFINITY
and 'soft-anti-affinity' in group.policies):
msg = _("ServerGroupSoftAntiAffinityWeigher not configured")
LOG.error(msg)
raise exception.UnsupportedPolicyException(reason=msg)
# NOTE(melwitt): If the context is already targeted to a cell (during a
# move operation), we don't need to scatter-gather.
if context.db_connection:
# We don't need to target the group object's context because it was
# retrieved with the targeted context earlier in this method.
group_hosts = set(group.get_hosts())
else:
group_hosts = set(
_get_instance_group_hosts_all_cells(context, group))
user_hosts = set(user_group_hosts) if user_group_hosts else set()
return GroupDetails(hosts=user_hosts | group_hosts,
policies=group.policies,
members=group.members)