def select_destinations(self, context, spec_obj, instance_uuids,
alloc_reqs_by_rp_uuid, provider_summaries,
allocation_request_version=None, return_alternates=False):
"""Returns a list of lists of Selection objects, which represent the
hosts and (optionally) alternates for each instance.
:param context: The RequestContext object
:param spec_obj: The RequestSpec object
:param instance_uuids: List of UUIDs, one for each value of the spec
object's num_instances attribute
:param alloc_reqs_by_rp_uuid: Optional dict, keyed by resource provider
UUID, of the allocation_requests that may
be used to claim resources against
matched hosts. If None, indicates either
the placement API wasn't reachable or
that there were no allocation_requests
returned by the placement API. If the
latter, the provider_summaries will be an
empty dict, not None.
:param provider_summaries: Optional dict, keyed by resource provider
UUID, of information that will be used by
the filters/weighers in selecting matching
hosts for a request. If None, indicates that
the scheduler driver should grab all compute
node information locally and that the
Placement API is not used. If an empty dict,
indicates the Placement API returned no
potential matches for the requested
resources.
:param allocation_request_version: The microversion used to request the
allocations.
:param return_alternates: When True, zero or more alternate hosts are
returned with each selected host. The number
of alternates is determined by the
configuration option
`CONF.scheduler.max_attempts`.
"""
self.notifier.info(
context, 'scheduler.select_destinations.start',
dict(request_spec=spec_obj.to_legacy_request_spec_dict()))
compute_utils.notify_about_scheduler_action(
context=context, request_spec=spec_obj,
action=fields_obj.NotificationAction.SELECT_DESTINATIONS,
phase=fields_obj.NotificationPhase.START)
host_selections = self._schedule(context, spec_obj, instance_uuids,
alloc_reqs_by_rp_uuid, provider_summaries,
allocation_request_version, return_alternates)
self.notifier.info(
context, 'scheduler.select_destinations.end',
dict(request_spec=spec_obj.to_legacy_request_spec_dict()))
compute_utils.notify_about_scheduler_action(
context=context, request_spec=spec_obj,
action=fields_obj.NotificationAction.SELECT_DESTINATIONS,
phase=fields_obj.NotificationPhase.END)
return host_selections
def select_destinations(self, context, spec_obj, instance_uuids,
alloc_reqs_by_rp_uuid, provider_summaries,
allocation_request_version=None, return_alternates=False):
"""Returns a list of lists of Selection objects, which represent the
hosts and (optionally) alternates for each instance.
:param context: The RequestContext object
:param spec_obj: The RequestSpec object
:param instance_uuids: List of UUIDs, one for each value of the spec
object's num_instances attribute
:param alloc_reqs_by_rp_uuid: Optional dict, keyed by resource provider
UUID, of the allocation_requests that may
be used to claim resources against
matched hosts. If None, indicates either
the placement API wasn't reachable or
that there were no allocation_requests
returned by the placement API. If the
latter, the provider_summaries will be an
empty dict, not None.
:param provider_summaries: Optional dict, keyed by resource provider
UUID, of information that will be used by
the filters/weighers in selecting matching
hosts for a request. If None, indicates that
the scheduler driver should grab all compute
node information locally and that the
Placement API is not used. If an empty dict,
indicates the Placement API returned no
potential matches for the requested
resources.
:param allocation_request_version: The microversion used to request the
allocations.
:param return_alternates: When True, zero or more alternate hosts are
returned with each selected host. The number
of alternates is determined by the
configuration option
`CONF.scheduler.max_attempts`.
"""
self.notifier.info(
context, 'scheduler.select_destinations.start',
dict(request_spec=spec_obj.to_legacy_request_spec_dict()))
compute_utils.notify_about_scheduler_action(
context=context, request_spec=spec_obj,
action=fields_obj.NotificationAction.SELECT_DESTINATIONS,
phase=fields_obj.NotificationPhase.START)
host_selections = self._schedule(context, spec_obj, instance_uuids,
alloc_reqs_by_rp_uuid, provider_summaries,
allocation_request_version, return_alternates)
self.notifier.info(
context, 'scheduler.select_destinations.end',
dict(request_spec=spec_obj.to_legacy_request_spec_dict()))
compute_utils.notify_about_scheduler_action(
context=context, request_spec=spec_obj,
action=fields_obj.NotificationAction.SELECT_DESTINATIONS,
phase=fields_obj.NotificationPhase.END)
return host_selections
def _select_destinations(
self,
context,
spec_obj,
instance_uuids,
alloc_reqs_by_rp_uuid,
provider_summaries,
allocation_request_version=None,
return_alternates=False,
):
self.notifier.info(
context, 'scheduler.select_destinations.start',
{'request_spec': spec_obj.to_legacy_request_spec_dict()})
compute_utils.notify_about_scheduler_action(
context=context,
request_spec=spec_obj,
action=fields_obj.NotificationAction.SELECT_DESTINATIONS,
phase=fields_obj.NotificationPhase.START)
# Only return alternates if both return_objects and return_alternates
# are True.
selections = self._schedule(context, spec_obj, instance_uuids,
alloc_reqs_by_rp_uuid, provider_summaries,
allocation_request_version,
return_alternates)
self.notifier.info(
context, 'scheduler.select_destinations.end',
{'request_spec': spec_obj.to_legacy_request_spec_dict()})
compute_utils.notify_about_scheduler_action(
context=context,
request_spec=spec_obj,
action=fields_obj.NotificationAction.SELECT_DESTINATIONS,
phase=fields_obj.NotificationPhase.END)
return selections