1740 lines
80 KiB
Python
1740 lines
80 KiB
Python
# Copyright (c) 2012 OpenStack Foundation
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""
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Track resources like memory and disk for a compute host. Provides the
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scheduler with useful information about availability through the ComputeNode
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model.
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"""
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import collections
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import copy
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from keystoneauth1 import exceptions as ks_exc
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import os_traits
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from oslo_log import log as logging
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from oslo_serialization import jsonutils
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from oslo_utils import excutils
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import retrying
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from nova.compute import claims
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from nova.compute import monitors
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from nova.compute import stats as compute_stats
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from nova.compute import task_states
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from nova.compute import utils as compute_utils
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from nova.compute import vm_states
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import nova.conf
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from nova import exception
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from nova.i18n import _
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from nova import objects
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from nova.objects import base as obj_base
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from nova.objects import migration as migration_obj
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from nova.pci import manager as pci_manager
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from nova.pci import request as pci_request
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from nova import rpc
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from nova.scheduler.client import report
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from nova import utils
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from nova.virt import hardware
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CONF = nova.conf.CONF
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LOG = logging.getLogger(__name__)
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COMPUTE_RESOURCE_SEMAPHORE = "compute_resources"
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def _instance_in_resize_state(instance):
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"""Returns True if the instance is in one of the resizing states.
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:param instance: `nova.objects.Instance` object
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"""
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vm = instance.vm_state
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task = instance.task_state
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if vm == vm_states.RESIZED:
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return True
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if vm in [vm_states.ACTIVE, vm_states.STOPPED] and task in (
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task_states.resizing_states + task_states.rebuild_states):
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return True
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return False
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def _instance_is_live_migrating(instance):
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vm = instance.vm_state
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task = instance.task_state
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if task == task_states.MIGRATING and vm in [vm_states.ACTIVE,
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vm_states.PAUSED]:
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return True
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return False
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class ResourceTracker(object):
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"""Compute helper class for keeping track of resource usage as instances
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are built and destroyed.
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"""
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def __init__(self, host, driver, reportclient=None):
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self.host = host
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self.driver = driver
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self.pci_tracker = None
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# Dict of objects.ComputeNode objects, keyed by nodename
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self.compute_nodes = {}
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# Dict of Stats objects, keyed by nodename
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self.stats = collections.defaultdict(compute_stats.Stats)
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# Set of UUIDs of instances tracked on this host.
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self.tracked_instances = set()
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self.tracked_migrations = {}
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self.is_bfv = {} # dict, keyed by instance uuid, to is_bfv boolean
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monitor_handler = monitors.MonitorHandler(self)
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self.monitors = monitor_handler.monitors
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self.old_resources = collections.defaultdict(objects.ComputeNode)
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self.reportclient = reportclient or report.SchedulerReportClient()
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self.ram_allocation_ratio = CONF.ram_allocation_ratio
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self.cpu_allocation_ratio = CONF.cpu_allocation_ratio
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self.disk_allocation_ratio = CONF.disk_allocation_ratio
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self.provider_tree = None
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# Dict of assigned_resources, keyed by resource provider uuid
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# the value is a dict again, keyed by resource class
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# and value of this sub-dict is a set of Resource obj
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self.assigned_resources = collections.defaultdict(
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lambda: collections.defaultdict(set))
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@utils.synchronized(COMPUTE_RESOURCE_SEMAPHORE)
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def instance_claim(self, context, instance, nodename, allocations,
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limits=None):
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"""Indicate that some resources are needed for an upcoming compute
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instance build operation.
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This should be called before the compute node is about to perform
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an instance build operation that will consume additional resources.
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:param context: security context
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:param instance: instance to reserve resources for.
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:type instance: nova.objects.instance.Instance object
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:param nodename: The Ironic nodename selected by the scheduler
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:param allocations: The placement allocation records for the instance.
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:param limits: Dict of oversubscription limits for memory, disk,
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and CPUs.
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:returns: A Claim ticket representing the reserved resources. It can
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be used to revert the resource usage if an error occurs
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during the instance build.
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"""
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if self.disabled(nodename):
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# instance_claim() was called before update_available_resource()
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# (which ensures that a compute node exists for nodename). We
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# shouldn't get here but in case we do, just set the instance's
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# host and nodename attribute (probably incorrect) and return a
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# NoopClaim.
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# TODO(jaypipes): Remove all the disabled junk from the resource
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# tracker. Servicegroup API-level active-checking belongs in the
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# nova-compute manager.
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self._set_instance_host_and_node(instance, nodename)
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return claims.NopClaim()
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# sanity checks:
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if instance.host:
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LOG.warning("Host field should not be set on the instance "
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"until resources have been claimed.",
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instance=instance)
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if instance.node:
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LOG.warning("Node field should not be set on the instance "
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"until resources have been claimed.",
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instance=instance)
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cn = self.compute_nodes[nodename]
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pci_requests = objects.InstancePCIRequests.get_by_instance_uuid(
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context, instance.uuid)
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claim = claims.Claim(context, instance, nodename, self, cn,
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pci_requests, limits=limits)
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# self._set_instance_host_and_node() will save instance to the DB
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# so set instance.numa_topology first. We need to make sure
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# that numa_topology is saved while under COMPUTE_RESOURCE_SEMAPHORE
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# so that the resource audit knows about any cpus we've pinned.
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instance_numa_topology = claim.claimed_numa_topology
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instance.numa_topology = instance_numa_topology
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self._set_instance_host_and_node(instance, nodename)
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if self.pci_tracker:
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# NOTE(jaypipes): ComputeNode.pci_device_pools is set below
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# in _update_usage_from_instance().
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self.pci_tracker.claim_instance(context, pci_requests,
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instance_numa_topology)
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claimed_resources = self._claim_resources(allocations)
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instance.resources = claimed_resources
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# Mark resources in-use and update stats
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self._update_usage_from_instance(context, instance, nodename)
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elevated = context.elevated()
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# persist changes to the compute node:
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self._update(elevated, cn)
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return claim
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@utils.synchronized(COMPUTE_RESOURCE_SEMAPHORE)
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def rebuild_claim(self, context, instance, nodename, allocations,
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limits=None, image_meta=None, migration=None):
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"""Create a claim for a rebuild operation."""
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instance_type = instance.flavor
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return self._move_claim(context, instance, instance_type, nodename,
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migration, allocations, move_type='evacuation',
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limits=limits, image_meta=image_meta)
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@utils.synchronized(COMPUTE_RESOURCE_SEMAPHORE)
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def resize_claim(self, context, instance, instance_type, nodename,
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migration, allocations, image_meta=None, limits=None):
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"""Create a claim for a resize or cold-migration move.
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Note that this code assumes ``instance.new_flavor`` is set when
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resizing with a new flavor.
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"""
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return self._move_claim(context, instance, instance_type, nodename,
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migration, allocations, image_meta=image_meta,
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limits=limits)
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@utils.synchronized(COMPUTE_RESOURCE_SEMAPHORE)
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def live_migration_claim(self, context, instance, nodename, migration,
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limits):
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"""Builds a MoveClaim for a live migration.
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:param context: The request context.
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:param instance: The instance being live migrated.
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:param nodename: The nodename of the destination host.
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:param migration: The Migration object associated with this live
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migration.
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:param limits: A SchedulerLimits object from when the scheduler
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selected the destination host.
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:returns: A MoveClaim for this live migration.
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"""
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# Flavor and image cannot change during a live migration.
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instance_type = instance.flavor
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image_meta = instance.image_meta
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# TODO(Luyao) will pass allocations to live_migration_claim after the
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# live migration change is done, now just set it None to _move_claim
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return self._move_claim(context, instance, instance_type, nodename,
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migration, None, move_type='live-migration',
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image_meta=image_meta, limits=limits)
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def _move_claim(self, context, instance, new_instance_type, nodename,
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migration, allocations, move_type=None,
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image_meta=None, limits=None):
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"""Indicate that resources are needed for a move to this host.
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Move can be either a migrate/resize, live-migrate or an
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evacuate/rebuild operation.
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:param context: security context
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:param instance: instance object to reserve resources for
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:param new_instance_type: new instance_type being resized to
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:param nodename: The Ironic nodename selected by the scheduler
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:param migration: A migration object if one was already created
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elsewhere for this operation (otherwise None)
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:param allocations: the placement allocation records.
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:param move_type: move type - can be one of 'migration', 'resize',
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'live-migration', 'evacuate'
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:param image_meta: instance image metadata
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:param limits: Dict of oversubscription limits for memory, disk,
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and CPUs
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:returns: A Claim ticket representing the reserved resources. This
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should be turned into finalize a resource claim or free
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resources after the compute operation is finished.
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"""
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image_meta = image_meta or {}
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if migration:
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self._claim_existing_migration(migration, nodename)
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else:
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migration = self._create_migration(context, instance,
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new_instance_type,
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nodename, move_type)
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if self.disabled(nodename):
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# compute_driver doesn't support resource tracking, just
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# generate the migration record and continue the resize:
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return claims.NopClaim(migration=migration)
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cn = self.compute_nodes[nodename]
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# TODO(moshele): we are recreating the pci requests even if
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# there was no change on resize. This will cause allocating
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# the old/new pci device in the resize phase. In the future
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# we would like to optimise this.
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new_pci_requests = pci_request.get_pci_requests_from_flavor(
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new_instance_type)
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new_pci_requests.instance_uuid = instance.uuid
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# On resize merge the SR-IOV ports pci_requests
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# with the new instance flavor pci_requests.
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if instance.pci_requests:
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for request in instance.pci_requests.requests:
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if request.source == objects.InstancePCIRequest.NEUTRON_PORT:
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new_pci_requests.requests.append(request)
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claim = claims.MoveClaim(context, instance, nodename,
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new_instance_type, image_meta, self, cn,
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new_pci_requests, migration, limits=limits)
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claimed_pci_devices_objs = []
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# TODO(artom) The second part of this condition should not be
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# necessary, but since SRIOV live migration is currently handled
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# elsewhere - see for example _claim_pci_for_instance_vifs() in the
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# compute manager - we don't do any PCI claims if this is a live
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# migration to avoid stepping on that code's toes. Ideally,
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# MoveClaim/this method would be used for all live migration resource
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# claims.
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if self.pci_tracker and migration.migration_type != 'live-migration':
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# NOTE(jaypipes): ComputeNode.pci_device_pools is set below
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# in _update_usage_from_instance().
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claimed_pci_devices_objs = self.pci_tracker.claim_instance(
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context, new_pci_requests, claim.claimed_numa_topology)
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claimed_pci_devices = objects.PciDeviceList(
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objects=claimed_pci_devices_objs)
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claimed_resources = self._claim_resources(allocations)
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old_resources = instance.resources
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# TODO(jaypipes): Move claimed_numa_topology out of the Claim's
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# constructor flow so the Claim constructor only tests whether
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# resources can be claimed, not consume the resources directly.
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mig_context = objects.MigrationContext(
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context=context, instance_uuid=instance.uuid,
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migration_id=migration.id,
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old_numa_topology=instance.numa_topology,
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new_numa_topology=claim.claimed_numa_topology,
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old_pci_devices=instance.pci_devices,
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new_pci_devices=claimed_pci_devices,
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old_pci_requests=instance.pci_requests,
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new_pci_requests=new_pci_requests,
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old_resources=old_resources,
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new_resources=claimed_resources)
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instance.migration_context = mig_context
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instance.save()
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# Mark the resources in-use for the resize landing on this
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# compute host:
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self._update_usage_from_migration(context, instance, migration,
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nodename)
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elevated = context.elevated()
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self._update(elevated, cn)
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return claim
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def _create_migration(self, context, instance, new_instance_type,
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nodename, move_type=None):
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"""Create a migration record for the upcoming resize. This should
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be done while the COMPUTE_RESOURCES_SEMAPHORE is held so the resource
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claim will not be lost if the audit process starts.
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"""
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migration = objects.Migration(context=context.elevated())
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migration.dest_compute = self.host
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migration.dest_node = nodename
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migration.dest_host = self.driver.get_host_ip_addr()
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migration.old_instance_type_id = instance.flavor.id
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migration.new_instance_type_id = new_instance_type.id
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migration.status = 'pre-migrating'
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migration.instance_uuid = instance.uuid
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migration.source_compute = instance.host
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migration.source_node = instance.node
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if move_type:
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migration.migration_type = move_type
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else:
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migration.migration_type = migration_obj.determine_migration_type(
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migration)
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migration.create()
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return migration
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def _claim_existing_migration(self, migration, nodename):
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"""Make an existing migration record count for resource tracking.
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If a migration record was created already before the request made
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it to this compute host, only set up the migration so it's included in
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resource tracking. This should be done while the
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COMPUTE_RESOURCES_SEMAPHORE is held.
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"""
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migration.dest_compute = self.host
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migration.dest_node = nodename
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migration.dest_host = self.driver.get_host_ip_addr()
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# NOTE(artom) Migration objects for live migrations are created with
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# status 'accepted' by the conductor in live_migrate_instance() and do
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# not have a 'pre-migrating' status.
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if migration.migration_type != 'live-migration':
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migration.status = 'pre-migrating'
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migration.save()
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def _claim_resources(self, allocations):
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"""Claim resources according to assigned resources from allocations
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and available resources in provider tree
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"""
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if not allocations:
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return None
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claimed_resources = []
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for rp_uuid, alloc_dict in allocations.items():
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try:
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provider_data = self.provider_tree.data(rp_uuid)
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except ValueError:
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# If an instance is in evacuating, it will hold new and old
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# allocations, but the provider UUIDs in old allocations won't
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# exist in the current provider tree, so skip it.
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LOG.debug("Skip claiming resources of provider %(rp_uuid)s, "
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"since the provider UUIDs are not in provider tree.",
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{'rp_uuid': rp_uuid})
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continue
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for rc, amount in alloc_dict['resources'].items():
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if rc not in provider_data.resources:
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# This means we don't use provider_data.resources to
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# assign this kind of resource class, such as 'VCPU' for
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# now, otherwise the provider_data.resources will be
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# populated with this resource class when updating
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# provider tree.
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continue
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assigned = self.assigned_resources[rp_uuid][rc]
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free = provider_data.resources[rc] - assigned
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if amount > len(free):
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reason = (_("Needed %(amount)d units of resource class "
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"%(rc)s, but %(avail)d are available.") %
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{'amount': amount,
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'rc': rc,
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'avail': len(free)})
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raise exception.ComputeResourcesUnavailable(reason=reason)
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for i in range(amount):
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claimed_resources.append(free.pop())
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if claimed_resources:
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self._add_assigned_resources(claimed_resources)
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return objects.ResourceList(objects=claimed_resources)
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def _populate_assigned_resources(self, context, instance_by_uuid):
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"""Populate self.assigned_resources organized by resource class and
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reource provider uuid, which is as following format:
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{
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$RP_UUID: {
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$RESOURCE_CLASS: [objects.Resource, ...],
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$RESOURCE_CLASS: [...]},
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...}
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"""
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resources = []
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# Get resources assigned to migrations
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for mig in self.tracked_migrations.values():
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mig_ctx = mig.instance.migration_context
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# We might have a migration whose instance hasn't arrived here yet.
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# Ignore it.
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if not mig_ctx:
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continue
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if mig.source_compute == self.host and 'old_resources' in mig_ctx:
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resources.extend(mig_ctx.old_resources or [])
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if mig.dest_compute == self.host and 'new_resources' in mig_ctx:
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resources.extend(mig_ctx.new_resources or [])
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# Get resources assigned to instances
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for uuid in self.tracked_instances:
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resources.extend(instance_by_uuid[uuid].resources or [])
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self.assigned_resources.clear()
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self._add_assigned_resources(resources)
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def _check_resources(self, context):
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"""Check if there are assigned resources not found in provider tree"""
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notfound = set()
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for rp_uuid in self.assigned_resources:
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provider_data = self.provider_tree.data(rp_uuid)
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for rc, assigned in self.assigned_resources[rp_uuid].items():
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notfound |= (assigned - provider_data.resources[rc])
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if not notfound:
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return
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# This only happens when assigned resources are removed
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# from the configuration and the compute service is SIGHUP'd
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# or restarted.
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resources = [(res.identifier, res.resource_class) for res in notfound]
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reason = _("The following resources are assigned to instances, "
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"but were not listed in the configuration: %s "
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"Please check if this will influence your instances, "
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"and restore your configuration if necessary") % resources
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raise exception.AssignedResourceNotFound(reason=reason)
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def _release_assigned_resources(self, resources):
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"""Remove resources from self.assigned_resources."""
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if not resources:
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return
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for resource in resources:
|
|
rp_uuid = resource.provider_uuid
|
|
rc = resource.resource_class
|
|
try:
|
|
self.assigned_resources[rp_uuid][rc].remove(resource)
|
|
except KeyError:
|
|
LOG.warning("Release resource %(rc)s: %(id)s of provider "
|
|
"%(rp_uuid)s, not tracked in "
|
|
"ResourceTracker.assigned_resources.",
|
|
{'rc': rc, 'id': resource.identifier,
|
|
'rp_uuid': rp_uuid})
|
|
|
|
def _add_assigned_resources(self, resources):
|
|
"""Add resources to self.assigned_resources"""
|
|
if not resources:
|
|
return
|
|
for resource in resources:
|
|
rp_uuid = resource.provider_uuid
|
|
rc = resource.resource_class
|
|
self.assigned_resources[rp_uuid][rc].add(resource)
|
|
|
|
def _set_instance_host_and_node(self, instance, nodename):
|
|
"""Tag the instance as belonging to this host. This should be done
|
|
while the COMPUTE_RESOURCES_SEMAPHORE is held so the resource claim
|
|
will not be lost if the audit process starts.
|
|
"""
|
|
# NOTE(mriedem): ComputeManager._nil_out_instance_obj_host_and_node is
|
|
# somewhat tightly coupled to the fields set in this method so if this
|
|
# method changes that method might need to be updated.
|
|
instance.host = self.host
|
|
instance.launched_on = self.host
|
|
instance.node = nodename
|
|
instance.save()
|
|
|
|
def _unset_instance_host_and_node(self, instance):
|
|
"""Untag the instance so it no longer belongs to the host.
|
|
|
|
This should be done while the COMPUTE_RESOURCES_SEMAPHORE is held so
|
|
the resource claim will not be lost if the audit process starts.
|
|
"""
|
|
instance.host = None
|
|
instance.node = None
|
|
instance.save()
|
|
|
|
@utils.synchronized(COMPUTE_RESOURCE_SEMAPHORE)
|
|
def abort_instance_claim(self, context, instance, nodename):
|
|
"""Remove usage from the given instance."""
|
|
self._update_usage_from_instance(context, instance, nodename,
|
|
is_removed=True)
|
|
|
|
instance.clear_numa_topology()
|
|
self._unset_instance_host_and_node(instance)
|
|
|
|
self._update(context.elevated(), self.compute_nodes[nodename])
|
|
|
|
def _drop_pci_devices(self, instance, nodename, prefix):
|
|
if self.pci_tracker:
|
|
# free old/new allocated pci devices
|
|
pci_devices = self._get_migration_context_resource(
|
|
'pci_devices', instance, prefix=prefix)
|
|
if pci_devices:
|
|
for pci_device in pci_devices:
|
|
self.pci_tracker.free_device(pci_device, instance)
|
|
|
|
dev_pools_obj = self.pci_tracker.stats.to_device_pools_obj()
|
|
self.compute_nodes[nodename].pci_device_pools = dev_pools_obj
|
|
|
|
@utils.synchronized(COMPUTE_RESOURCE_SEMAPHORE)
|
|
def drop_move_claim(self, context, instance, nodename,
|
|
instance_type=None, prefix='new_'):
|
|
"""Remove usage for an incoming/outgoing migration.
|
|
|
|
:param context: Security context.
|
|
:param instance: The instance whose usage is to be removed.
|
|
:param nodename: Host on which to remove usage. If the migration
|
|
completed successfully, this is normally the source.
|
|
If it did not complete successfully (failed or
|
|
reverted), this is normally the destination.
|
|
:param instance_type: The flavor that determines the usage to remove.
|
|
If the migration completed successfully, this is
|
|
the old flavor to be removed from the source. If
|
|
the migration did not complete successfully, this
|
|
is the new flavor to be removed from the
|
|
destination.
|
|
:param prefix: Prefix to use when accessing migration context
|
|
attributes. 'old_' or 'new_', with 'new_' being the
|
|
default.
|
|
"""
|
|
# Remove usage for an instance that is tracked in migrations, such as
|
|
# on the dest node during revert resize.
|
|
if instance['uuid'] in self.tracked_migrations:
|
|
migration = self.tracked_migrations.pop(instance['uuid'])
|
|
if not instance_type:
|
|
instance_type = self._get_instance_type(instance, prefix,
|
|
migration)
|
|
# Remove usage for an instance that is not tracked in migrations (such
|
|
# as on the source node after a migration).
|
|
# NOTE(lbeliveau): On resize on the same node, the instance is
|
|
# included in both tracked_migrations and tracked_instances.
|
|
elif instance['uuid'] in self.tracked_instances:
|
|
self.tracked_instances.remove(instance['uuid'])
|
|
|
|
if instance_type is not None:
|
|
numa_topology = self._get_migration_context_resource(
|
|
'numa_topology', instance, prefix=prefix)
|
|
usage = self._get_usage_dict(
|
|
instance_type, instance, numa_topology=numa_topology)
|
|
self._drop_pci_devices(instance, nodename, prefix)
|
|
resources = self._get_migration_context_resource(
|
|
'resources', instance, prefix=prefix)
|
|
self._release_assigned_resources(resources)
|
|
self._update_usage(usage, nodename, sign=-1)
|
|
|
|
ctxt = context.elevated()
|
|
self._update(ctxt, self.compute_nodes[nodename])
|
|
|
|
@utils.synchronized(COMPUTE_RESOURCE_SEMAPHORE)
|
|
def update_usage(self, context, instance, nodename):
|
|
"""Update the resource usage and stats after a change in an
|
|
instance
|
|
"""
|
|
if self.disabled(nodename):
|
|
return
|
|
|
|
uuid = instance['uuid']
|
|
|
|
# don't update usage for this instance unless it submitted a resource
|
|
# claim first:
|
|
if uuid in self.tracked_instances:
|
|
self._update_usage_from_instance(context, instance, nodename)
|
|
self._update(context.elevated(), self.compute_nodes[nodename])
|
|
|
|
def disabled(self, nodename):
|
|
return (nodename not in self.compute_nodes or
|
|
not self.driver.node_is_available(nodename))
|
|
|
|
def _check_for_nodes_rebalance(self, context, resources, nodename):
|
|
"""Check if nodes rebalance has happened.
|
|
|
|
The ironic driver maintains a hash ring mapping bare metal nodes
|
|
to compute nodes. If a compute dies, the hash ring is rebuilt, and
|
|
some of its bare metal nodes (more precisely, those not in ACTIVE
|
|
state) are assigned to other computes.
|
|
|
|
This method checks for this condition and adjusts the database
|
|
accordingly.
|
|
|
|
:param context: security context
|
|
:param resources: initial values
|
|
:param nodename: node name
|
|
:returns: True if a suitable compute node record was found, else False
|
|
"""
|
|
if not self.driver.rebalances_nodes:
|
|
return False
|
|
|
|
# Its possible ironic just did a node re-balance, so let's
|
|
# check if there is a compute node that already has the correct
|
|
# hypervisor_hostname. We can re-use that rather than create a
|
|
# new one and have to move existing placement allocations
|
|
cn_candidates = objects.ComputeNodeList.get_by_hypervisor(
|
|
context, nodename)
|
|
|
|
if len(cn_candidates) == 1:
|
|
cn = cn_candidates[0]
|
|
LOG.info("ComputeNode %(name)s moving from %(old)s to %(new)s",
|
|
{"name": nodename, "old": cn.host, "new": self.host})
|
|
cn.host = self.host
|
|
self.compute_nodes[nodename] = cn
|
|
self._copy_resources(cn, resources)
|
|
self._setup_pci_tracker(context, cn, resources)
|
|
self._update(context, cn)
|
|
return True
|
|
elif len(cn_candidates) > 1:
|
|
LOG.error(
|
|
"Found more than one ComputeNode for nodename %s. "
|
|
"Please clean up the orphaned ComputeNode records in your DB.",
|
|
nodename)
|
|
|
|
return False
|
|
|
|
def _init_compute_node(self, context, resources):
|
|
"""Initialize the compute node if it does not already exist.
|
|
|
|
The resource tracker will be inoperable if compute_node
|
|
is not defined. The compute_node will remain undefined if
|
|
we fail to create it or if there is no associated service
|
|
registered.
|
|
|
|
If this method has to create a compute node it needs initial
|
|
values - these come from resources.
|
|
|
|
:param context: security context
|
|
:param resources: initial values
|
|
:returns: True if a new compute_nodes table record was created,
|
|
False otherwise
|
|
"""
|
|
nodename = resources['hypervisor_hostname']
|
|
|
|
# if there is already a compute node just use resources
|
|
# to initialize
|
|
if nodename in self.compute_nodes:
|
|
cn = self.compute_nodes[nodename]
|
|
self._copy_resources(cn, resources)
|
|
self._setup_pci_tracker(context, cn, resources)
|
|
return False
|
|
|
|
# now try to get the compute node record from the
|
|
# database. If we get one we use resources to initialize
|
|
cn = self._get_compute_node(context, nodename)
|
|
if cn:
|
|
self.compute_nodes[nodename] = cn
|
|
self._copy_resources(cn, resources)
|
|
self._setup_pci_tracker(context, cn, resources)
|
|
return False
|
|
|
|
if self._check_for_nodes_rebalance(context, resources, nodename):
|
|
return False
|
|
|
|
# there was no local copy and none in the database
|
|
# so we need to create a new compute node. This needs
|
|
# to be initialized with resource values.
|
|
cn = objects.ComputeNode(context)
|
|
cn.host = self.host
|
|
self._copy_resources(cn, resources, initial=True)
|
|
cn.create()
|
|
# Only map the ComputeNode into compute_nodes if create() was OK
|
|
# because if create() fails, on the next run through here nodename
|
|
# would be in compute_nodes and we won't try to create again (because
|
|
# of the logic above).
|
|
self.compute_nodes[nodename] = cn
|
|
LOG.info('Compute node record created for '
|
|
'%(host)s:%(node)s with uuid: %(uuid)s',
|
|
{'host': self.host, 'node': nodename, 'uuid': cn.uuid})
|
|
|
|
self._setup_pci_tracker(context, cn, resources)
|
|
return True
|
|
|
|
def _setup_pci_tracker(self, context, compute_node, resources):
|
|
if not self.pci_tracker:
|
|
n_id = compute_node.id
|
|
self.pci_tracker = pci_manager.PciDevTracker(context, node_id=n_id)
|
|
if 'pci_passthrough_devices' in resources:
|
|
dev_json = resources.pop('pci_passthrough_devices')
|
|
self.pci_tracker.update_devices_from_hypervisor_resources(
|
|
dev_json)
|
|
|
|
dev_pools_obj = self.pci_tracker.stats.to_device_pools_obj()
|
|
compute_node.pci_device_pools = dev_pools_obj
|
|
|
|
def _copy_resources(self, compute_node, resources, initial=False):
|
|
"""Copy resource values to supplied compute_node."""
|
|
nodename = resources['hypervisor_hostname']
|
|
stats = self.stats[nodename]
|
|
# purge old stats and init with anything passed in by the driver
|
|
# NOTE(danms): Preserve 'failed_builds' across the stats clearing,
|
|
# as that is not part of resources
|
|
# TODO(danms): Stop doing this when we get a column to store this
|
|
# directly
|
|
prev_failed_builds = stats.get('failed_builds', 0)
|
|
stats.clear()
|
|
stats['failed_builds'] = prev_failed_builds
|
|
stats.digest_stats(resources.get('stats'))
|
|
compute_node.stats = stats
|
|
|
|
# Update the allocation ratios for the related ComputeNode object
|
|
# but only if the configured values are not the default; the
|
|
# ComputeNode._from_db_object method takes care of providing default
|
|
# allocation ratios when the config is left at the default, so
|
|
# we'll really end up with something like a
|
|
# ComputeNode.cpu_allocation_ratio of 16.0. We want to avoid
|
|
# resetting the ComputeNode fields to None because that will make
|
|
# the _resource_change method think something changed when really it
|
|
# didn't.
|
|
# NOTE(yikun): The CONF.initial_(cpu|ram|disk)_allocation_ratio would
|
|
# be used when we initialize the compute node object, that means the
|
|
# ComputeNode.(cpu|ram|disk)_allocation_ratio will be set to
|
|
# CONF.initial_(cpu|ram|disk)_allocation_ratio when initial flag is
|
|
# True.
|
|
for res in ('cpu', 'disk', 'ram'):
|
|
attr = '%s_allocation_ratio' % res
|
|
if initial:
|
|
conf_alloc_ratio = getattr(CONF, 'initial_%s' % attr)
|
|
else:
|
|
conf_alloc_ratio = getattr(self, attr)
|
|
# NOTE(yikun): In Stein version, we change the default value of
|
|
# (cpu|ram|disk)_allocation_ratio from 0.0 to None, but we still
|
|
# should allow 0.0 to keep compatibility, and this 0.0 condition
|
|
# will be removed in the next version (T version).
|
|
if conf_alloc_ratio not in (0.0, None):
|
|
setattr(compute_node, attr, conf_alloc_ratio)
|
|
|
|
# now copy rest to compute_node
|
|
compute_node.update_from_virt_driver(resources)
|
|
|
|
def remove_node(self, nodename):
|
|
"""Handle node removal/rebalance.
|
|
|
|
Clean up any stored data about a compute node no longer
|
|
managed by this host.
|
|
"""
|
|
self.stats.pop(nodename, None)
|
|
self.compute_nodes.pop(nodename, None)
|
|
self.old_resources.pop(nodename, None)
|
|
|
|
def _get_host_metrics(self, context, nodename):
|
|
"""Get the metrics from monitors and
|
|
notify information to message bus.
|
|
"""
|
|
metrics = objects.MonitorMetricList()
|
|
metrics_info = {}
|
|
for monitor in self.monitors:
|
|
try:
|
|
monitor.populate_metrics(metrics)
|
|
except NotImplementedError:
|
|
LOG.debug("The compute driver doesn't support host "
|
|
"metrics for %(mon)s", {'mon': monitor})
|
|
except Exception as exc:
|
|
LOG.warning("Cannot get the metrics from %(mon)s; "
|
|
"error: %(exc)s",
|
|
{'mon': monitor, 'exc': exc})
|
|
# TODO(jaypipes): Remove this when compute_node.metrics doesn't need
|
|
# to be populated as a JSONified string.
|
|
metric_list = metrics.to_list()
|
|
if len(metric_list):
|
|
metrics_info['nodename'] = nodename
|
|
metrics_info['metrics'] = metric_list
|
|
metrics_info['host'] = self.host
|
|
metrics_info['host_ip'] = CONF.my_ip
|
|
notifier = rpc.get_notifier(service='compute', host=nodename)
|
|
notifier.info(context, 'compute.metrics.update', metrics_info)
|
|
compute_utils.notify_about_metrics_update(
|
|
context, self.host, CONF.my_ip, nodename, metrics)
|
|
return metric_list
|
|
|
|
def update_available_resource(self, context, nodename, startup=False):
|
|
"""Override in-memory calculations of compute node resource usage based
|
|
on data audited from the hypervisor layer.
|
|
|
|
Add in resource claims in progress to account for operations that have
|
|
declared a need for resources, but not necessarily retrieved them from
|
|
the hypervisor layer yet.
|
|
|
|
:param nodename: Temporary parameter representing the Ironic resource
|
|
node. This parameter will be removed once Ironic
|
|
baremetal resource nodes are handled like any other
|
|
resource in the system.
|
|
:param startup: Boolean indicating whether we're running this on
|
|
on startup (True) or periodic (False).
|
|
"""
|
|
LOG.debug("Auditing locally available compute resources for "
|
|
"%(host)s (node: %(node)s)",
|
|
{'node': nodename,
|
|
'host': self.host})
|
|
resources = self.driver.get_available_resource(nodename)
|
|
# NOTE(jaypipes): The resources['hypervisor_hostname'] field now
|
|
# contains a non-None value, even for non-Ironic nova-compute hosts. It
|
|
# is this value that will be populated in the compute_nodes table.
|
|
resources['host_ip'] = CONF.my_ip
|
|
|
|
# We want the 'cpu_info' to be None from the POV of the
|
|
# virt driver, but the DB requires it to be non-null so
|
|
# just force it to empty string
|
|
if "cpu_info" not in resources or resources["cpu_info"] is None:
|
|
resources["cpu_info"] = ''
|
|
|
|
self._verify_resources(resources)
|
|
|
|
self._report_hypervisor_resource_view(resources)
|
|
|
|
self._update_available_resource(context, resources, startup=startup)
|
|
|
|
def _pair_instances_to_migrations(self, migrations, instance_by_uuid):
|
|
for migration in migrations:
|
|
try:
|
|
migration.instance = instance_by_uuid[migration.instance_uuid]
|
|
except KeyError:
|
|
# NOTE(danms): If this happens, we don't set it here, and
|
|
# let the code either fail or lazy-load the instance later
|
|
# which is what happened before we added this optimization.
|
|
# NOTE(tdurakov) this situation is possible for resize/cold
|
|
# migration when migration is finished but haven't yet
|
|
# confirmed/reverted in that case instance already changed host
|
|
# to destination and no matching happens
|
|
LOG.debug('Migration for instance %(uuid)s refers to '
|
|
'another host\'s instance!',
|
|
{'uuid': migration.instance_uuid})
|
|
|
|
@utils.synchronized(COMPUTE_RESOURCE_SEMAPHORE)
|
|
def _update_available_resource(self, context, resources, startup=False):
|
|
|
|
# initialize the compute node object, creating it
|
|
# if it does not already exist.
|
|
is_new_compute_node = self._init_compute_node(context, resources)
|
|
|
|
nodename = resources['hypervisor_hostname']
|
|
|
|
# if we could not init the compute node the tracker will be
|
|
# disabled and we should quit now
|
|
if self.disabled(nodename):
|
|
return
|
|
|
|
# Grab all instances assigned to this node:
|
|
instances = objects.InstanceList.get_by_host_and_node(
|
|
context, self.host, nodename,
|
|
expected_attrs=['system_metadata',
|
|
'numa_topology',
|
|
'flavor', 'migration_context',
|
|
'resources'])
|
|
|
|
# Now calculate usage based on instance utilization:
|
|
instance_by_uuid = self._update_usage_from_instances(
|
|
context, instances, nodename)
|
|
|
|
# Grab all in-progress migrations:
|
|
migrations = objects.MigrationList.get_in_progress_by_host_and_node(
|
|
context, self.host, nodename)
|
|
|
|
self._pair_instances_to_migrations(migrations, instance_by_uuid)
|
|
self._update_usage_from_migrations(context, migrations, nodename)
|
|
|
|
# A new compute node means there won't be a resource provider yet since
|
|
# that would be created via the _update() call below, and if there is
|
|
# no resource provider then there are no allocations against it.
|
|
if not is_new_compute_node:
|
|
self._remove_deleted_instances_allocations(
|
|
context, self.compute_nodes[nodename], migrations,
|
|
instance_by_uuid)
|
|
|
|
# Detect and account for orphaned instances that may exist on the
|
|
# hypervisor, but are not in the DB:
|
|
orphans = self._find_orphaned_instances()
|
|
self._update_usage_from_orphans(orphans, nodename)
|
|
|
|
cn = self.compute_nodes[nodename]
|
|
|
|
# NOTE(yjiang5): Because pci device tracker status is not cleared in
|
|
# this periodic task, and also because the resource tracker is not
|
|
# notified when instances are deleted, we need remove all usages
|
|
# from deleted instances.
|
|
self.pci_tracker.clean_usage(instances, migrations, orphans)
|
|
dev_pools_obj = self.pci_tracker.stats.to_device_pools_obj()
|
|
cn.pci_device_pools = dev_pools_obj
|
|
|
|
self._report_final_resource_view(nodename)
|
|
|
|
metrics = self._get_host_metrics(context, nodename)
|
|
# TODO(pmurray): metrics should not be a json string in ComputeNode,
|
|
# but it is. This should be changed in ComputeNode
|
|
cn.metrics = jsonutils.dumps(metrics)
|
|
|
|
# Update assigned resources to self.assigned_resources
|
|
self._populate_assigned_resources(context, instance_by_uuid)
|
|
|
|
# update the compute_node
|
|
self._update(context, cn, startup=startup)
|
|
LOG.debug('Compute_service record updated for %(host)s:%(node)s',
|
|
{'host': self.host, 'node': nodename})
|
|
|
|
# Check if there is any resource assigned but not found
|
|
# in provider tree
|
|
if startup:
|
|
self._check_resources(context)
|
|
|
|
def _get_compute_node(self, context, nodename):
|
|
"""Returns compute node for the host and nodename."""
|
|
try:
|
|
return objects.ComputeNode.get_by_host_and_nodename(
|
|
context, self.host, nodename)
|
|
except exception.NotFound:
|
|
LOG.warning("No compute node record for %(host)s:%(node)s",
|
|
{'host': self.host, 'node': nodename})
|
|
|
|
def _report_hypervisor_resource_view(self, resources):
|
|
"""Log the hypervisor's view of free resources.
|
|
|
|
This is just a snapshot of resource usage recorded by the
|
|
virt driver.
|
|
|
|
The following resources are logged:
|
|
- free memory
|
|
- free disk
|
|
- free CPUs
|
|
- assignable PCI devices
|
|
"""
|
|
nodename = resources['hypervisor_hostname']
|
|
free_ram_mb = resources['memory_mb'] - resources['memory_mb_used']
|
|
free_disk_gb = resources['local_gb'] - resources['local_gb_used']
|
|
vcpus = resources['vcpus']
|
|
if vcpus:
|
|
free_vcpus = vcpus - resources['vcpus_used']
|
|
else:
|
|
free_vcpus = 'unknown'
|
|
|
|
pci_devices = resources.get('pci_passthrough_devices')
|
|
|
|
LOG.debug("Hypervisor/Node resource view: "
|
|
"name=%(node)s "
|
|
"free_ram=%(free_ram)sMB "
|
|
"free_disk=%(free_disk)sGB "
|
|
"free_vcpus=%(free_vcpus)s "
|
|
"pci_devices=%(pci_devices)s",
|
|
{'node': nodename,
|
|
'free_ram': free_ram_mb,
|
|
'free_disk': free_disk_gb,
|
|
'free_vcpus': free_vcpus,
|
|
'pci_devices': pci_devices})
|
|
|
|
def _report_final_resource_view(self, nodename):
|
|
"""Report final calculate of physical memory, used virtual memory,
|
|
disk, usable vCPUs, used virtual CPUs and PCI devices,
|
|
including instance calculations and in-progress resource claims. These
|
|
values will be exposed via the compute node table to the scheduler.
|
|
"""
|
|
cn = self.compute_nodes[nodename]
|
|
vcpus = cn.vcpus
|
|
if vcpus:
|
|
tcpu = vcpus
|
|
ucpu = cn.vcpus_used
|
|
LOG.debug("Total usable vcpus: %(tcpu)s, "
|
|
"total allocated vcpus: %(ucpu)s",
|
|
{'tcpu': vcpus,
|
|
'ucpu': ucpu})
|
|
else:
|
|
tcpu = 0
|
|
ucpu = 0
|
|
pci_stats = (list(cn.pci_device_pools) if
|
|
cn.pci_device_pools else [])
|
|
LOG.debug("Final resource view: "
|
|
"name=%(node)s "
|
|
"phys_ram=%(phys_ram)sMB "
|
|
"used_ram=%(used_ram)sMB "
|
|
"phys_disk=%(phys_disk)sGB "
|
|
"used_disk=%(used_disk)sGB "
|
|
"total_vcpus=%(total_vcpus)s "
|
|
"used_vcpus=%(used_vcpus)s "
|
|
"pci_stats=%(pci_stats)s",
|
|
{'node': nodename,
|
|
'phys_ram': cn.memory_mb,
|
|
'used_ram': cn.memory_mb_used,
|
|
'phys_disk': cn.local_gb,
|
|
'used_disk': cn.local_gb_used,
|
|
'total_vcpus': tcpu,
|
|
'used_vcpus': ucpu,
|
|
'pci_stats': pci_stats})
|
|
|
|
def _resource_change(self, compute_node):
|
|
"""Check to see if any resources have changed."""
|
|
nodename = compute_node.hypervisor_hostname
|
|
old_compute = self.old_resources[nodename]
|
|
if not obj_base.obj_equal_prims(
|
|
compute_node, old_compute, ['updated_at']):
|
|
self.old_resources[nodename] = copy.deepcopy(compute_node)
|
|
return True
|
|
return False
|
|
|
|
def _sync_compute_service_disabled_trait(self, context, traits):
|
|
"""Synchronize the COMPUTE_STATUS_DISABLED trait on the node provider.
|
|
|
|
Determines if the COMPUTE_STATUS_DISABLED trait should be added to
|
|
or removed from the provider's set of traits based on the related
|
|
nova-compute service disabled status.
|
|
|
|
:param context: RequestContext for cell database access
|
|
:param traits: set of traits for the compute node resource provider;
|
|
this is modified by reference
|
|
"""
|
|
trait = os_traits.COMPUTE_STATUS_DISABLED
|
|
try:
|
|
service = objects.Service.get_by_compute_host(context, self.host)
|
|
if service.disabled:
|
|
# The service is disabled so make sure the trait is reported.
|
|
traits.add(trait)
|
|
else:
|
|
# The service is not disabled so do not report the trait.
|
|
traits.discard(trait)
|
|
except exception.NotFound:
|
|
# This should not happen but handle it gracefully. The scheduler
|
|
# should ignore this node if the compute service record is gone.
|
|
LOG.error('Unable to find services table record for nova-compute '
|
|
'host %s', self.host)
|
|
|
|
def _get_traits(self, context, nodename, provider_tree):
|
|
"""Synchronizes internal and external traits for the node provider.
|
|
|
|
This works in conjunction with the ComptueDriver.update_provider_tree
|
|
flow and is used to synchronize traits reported by the compute driver,
|
|
traits based on information in the ComputeNode record, and traits set
|
|
externally using the placement REST API.
|
|
|
|
:param context: RequestContext for cell database access
|
|
:param nodename: ComputeNode.hypervisor_hostname for the compute node
|
|
resource provider whose traits are being synchronized; the node
|
|
must be in the ProviderTree.
|
|
:param provider_tree: ProviderTree being updated
|
|
"""
|
|
# Get the traits from the ProviderTree which will be the set
|
|
# of virt-owned traits plus any externally defined traits set
|
|
# on the provider that aren't owned by the virt driver.
|
|
traits = provider_tree.data(nodename).traits
|
|
|
|
# Now get the driver's capabilities and add any supported
|
|
# traits that are missing, and remove any existing set traits
|
|
# that are not currently supported.
|
|
for trait, supported in self.driver.capabilities_as_traits().items():
|
|
if supported:
|
|
traits.add(trait)
|
|
elif trait in traits:
|
|
traits.remove(trait)
|
|
|
|
self._sync_compute_service_disabled_trait(context, traits)
|
|
|
|
return list(traits)
|
|
|
|
@retrying.retry(stop_max_attempt_number=4,
|
|
retry_on_exception=lambda e: isinstance(
|
|
e, exception.ResourceProviderUpdateConflict))
|
|
def _update_to_placement(self, context, compute_node, startup):
|
|
"""Send resource and inventory changes to placement."""
|
|
# NOTE(jianghuaw): Some resources(e.g. VGPU) are not saved in the
|
|
# object of compute_node; instead the inventory data for these
|
|
# resource is reported by driver's update_provider_tree(). So even if
|
|
# there is no resource change for compute_node, we need proceed
|
|
# to get inventory and use report client interfaces to update
|
|
# inventory to placement. It's report client's responsibility to
|
|
# ensure the update request to placement only happens when inventory
|
|
# is changed.
|
|
nodename = compute_node.hypervisor_hostname
|
|
# Persist the stats to the Scheduler
|
|
# Retrieve the provider tree associated with this compute node. If
|
|
# it doesn't exist yet, this will create it with a (single, root)
|
|
# provider corresponding to the compute node.
|
|
prov_tree = self.reportclient.get_provider_tree_and_ensure_root(
|
|
context, compute_node.uuid, name=compute_node.hypervisor_hostname)
|
|
# Let the virt driver rearrange the provider tree and set/update
|
|
# the inventory, traits, and aggregates throughout.
|
|
allocs = None
|
|
try:
|
|
self.driver.update_provider_tree(prov_tree, nodename)
|
|
except exception.ReshapeNeeded:
|
|
if not startup:
|
|
# This isn't supposed to happen during periodic, so raise
|
|
# it up; the compute manager will treat it specially.
|
|
raise
|
|
LOG.info("Performing resource provider inventory and "
|
|
"allocation data migration during compute service "
|
|
"startup or fast-forward upgrade.")
|
|
allocs = self.reportclient.get_allocations_for_provider_tree(
|
|
context, nodename)
|
|
self.driver.update_provider_tree(prov_tree, nodename,
|
|
allocations=allocs)
|
|
|
|
# Inject driver capabilities traits into the provider
|
|
# tree. We need to determine the traits that the virt
|
|
# driver owns - so those that come from the tree itself
|
|
# (via the virt driver) plus the compute capabilities
|
|
# traits, and then merge those with the traits set
|
|
# externally that the driver does not own - and remove any
|
|
# set on the provider externally that the virt owns but
|
|
# aren't in the current list of supported traits. For
|
|
# example, let's say we reported multiattach support as a
|
|
# trait at t1 and then at t2 it's not, so we need to
|
|
# remove it. But at both t1 and t2 there is a
|
|
# CUSTOM_VENDOR_TRAIT_X which we can't touch because it
|
|
# was set externally on the provider.
|
|
# We also want to sync the COMPUTE_STATUS_DISABLED trait based
|
|
# on the related nova-compute service's disabled status.
|
|
traits = self._get_traits(
|
|
context, nodename, provider_tree=prov_tree)
|
|
prov_tree.update_traits(nodename, traits)
|
|
|
|
self.provider_tree = prov_tree
|
|
|
|
# Flush any changes. If we processed ReshapeNeeded above, allocs is not
|
|
# None, and this will hit placement's POST /reshaper route.
|
|
self.reportclient.update_from_provider_tree(context, prov_tree,
|
|
allocations=allocs)
|
|
|
|
def _update(self, context, compute_node, startup=False):
|
|
"""Update partial stats locally and populate them to Scheduler."""
|
|
# _resource_change will update self.old_resources if it detects changes
|
|
# but we want to restore those if compute_node.save() fails.
|
|
nodename = compute_node.hypervisor_hostname
|
|
old_compute = self.old_resources[nodename]
|
|
if self._resource_change(compute_node):
|
|
# If the compute_node's resource changed, update to DB. Note that
|
|
# _update_to_placement below does not supersede the need to do this
|
|
# because there are stats-related fields in the ComputeNode object
|
|
# which could have changed and still need to be reported to the
|
|
# scheduler filters/weighers (which could be out of tree as well).
|
|
try:
|
|
compute_node.save()
|
|
except Exception:
|
|
# Restore the previous state in self.old_resources so that on
|
|
# the next trip through here _resource_change does not have
|
|
# stale data to compare.
|
|
with excutils.save_and_reraise_exception(logger=LOG):
|
|
self.old_resources[nodename] = old_compute
|
|
|
|
self._update_to_placement(context, compute_node, startup)
|
|
|
|
if self.pci_tracker:
|
|
self.pci_tracker.save(context)
|
|
|
|
def _update_usage(self, usage, nodename, sign=1):
|
|
# TODO(stephenfin): We don't use the CPU, RAM and disk fields for much
|
|
# except 'Aggregate(Core|Ram|Disk)Filter', the 'os-hypervisors' API,
|
|
# and perhaps some out-of-tree filters. Once the in-tree stuff is
|
|
# removed or updated to use information from placement, we can think
|
|
# about dropping the fields from the 'ComputeNode' object entirely
|
|
mem_usage = usage['memory_mb']
|
|
disk_usage = usage.get('root_gb', 0)
|
|
vcpus_usage = usage.get('vcpus', 0)
|
|
|
|
cn = self.compute_nodes[nodename]
|
|
cn.memory_mb_used += sign * mem_usage
|
|
cn.local_gb_used += sign * disk_usage
|
|
cn.local_gb_used += sign * usage.get('ephemeral_gb', 0)
|
|
cn.local_gb_used += sign * usage.get('swap', 0) / 1024
|
|
cn.vcpus_used += sign * vcpus_usage
|
|
|
|
# free ram and disk may be negative, depending on policy:
|
|
cn.free_ram_mb = cn.memory_mb - cn.memory_mb_used
|
|
cn.free_disk_gb = cn.local_gb - cn.local_gb_used
|
|
|
|
stats = self.stats[nodename]
|
|
cn.running_vms = stats.num_instances
|
|
|
|
# calculate the NUMA usage, assuming the instance is actually using
|
|
# NUMA, of course
|
|
if cn.numa_topology and usage.get('numa_topology'):
|
|
instance_numa_topology = usage.get('numa_topology')
|
|
# the ComputeNode.numa_topology field is a StringField, so
|
|
# deserialize
|
|
host_numa_topology = objects.NUMATopology.obj_from_db_obj(
|
|
cn.numa_topology)
|
|
|
|
free = sign == -1
|
|
|
|
# ...and reserialize once we save it back
|
|
cn.numa_topology = hardware.numa_usage_from_instance_numa(
|
|
host_numa_topology, instance_numa_topology, free)._to_json()
|
|
|
|
def _get_migration_context_resource(self, resource, instance,
|
|
prefix='new_'):
|
|
migration_context = instance.migration_context
|
|
resource = prefix + resource
|
|
if migration_context and resource in migration_context:
|
|
return getattr(migration_context, resource)
|
|
return None
|
|
|
|
def _update_usage_from_migration(self, context, instance, migration,
|
|
nodename):
|
|
"""Update usage for a single migration. The record may
|
|
represent an incoming or outbound migration.
|
|
"""
|
|
uuid = migration.instance_uuid
|
|
LOG.info("Updating resource usage from migration %s", migration.uuid,
|
|
instance_uuid=uuid)
|
|
|
|
incoming = (migration.dest_compute == self.host and
|
|
migration.dest_node == nodename)
|
|
outbound = (migration.source_compute == self.host and
|
|
migration.source_node == nodename)
|
|
same_node = (incoming and outbound)
|
|
|
|
tracked = uuid in self.tracked_instances
|
|
itype = None
|
|
numa_topology = None
|
|
sign = 0
|
|
if same_node:
|
|
# Same node resize. Record usage for the 'new_' resources. This
|
|
# is executed on resize_claim().
|
|
if (instance['instance_type_id'] ==
|
|
migration.old_instance_type_id):
|
|
itype = self._get_instance_type(instance, 'new_', migration)
|
|
numa_topology = self._get_migration_context_resource(
|
|
'numa_topology', instance)
|
|
# Allocate pci device(s) for the instance.
|
|
sign = 1
|
|
else:
|
|
# The instance is already set to the new flavor (this is done
|
|
# by the compute manager on finish_resize()), hold space for a
|
|
# possible revert to the 'old_' resources.
|
|
# NOTE(lbeliveau): When the periodic audit timer gets
|
|
# triggered, the compute usage gets reset. The usage for an
|
|
# instance that is migrated to the new flavor but not yet
|
|
# confirmed/reverted will first get accounted for by
|
|
# _update_usage_from_instances(). This method will then be
|
|
# called, and we need to account for the '_old' resources
|
|
# (just in case).
|
|
itype = self._get_instance_type(instance, 'old_', migration)
|
|
numa_topology = self._get_migration_context_resource(
|
|
'numa_topology', instance, prefix='old_')
|
|
|
|
elif incoming and not tracked:
|
|
# instance has not yet migrated here:
|
|
itype = self._get_instance_type(instance, 'new_', migration)
|
|
numa_topology = self._get_migration_context_resource(
|
|
'numa_topology', instance)
|
|
# Allocate pci device(s) for the instance.
|
|
sign = 1
|
|
LOG.debug('Starting to track incoming migration %s with flavor %s',
|
|
migration.uuid, itype.flavorid, instance=instance)
|
|
|
|
elif outbound and not tracked:
|
|
# instance migrated, but record usage for a possible revert:
|
|
itype = self._get_instance_type(instance, 'old_', migration)
|
|
numa_topology = self._get_migration_context_resource(
|
|
'numa_topology', instance, prefix='old_')
|
|
# We could be racing with confirm_resize setting the
|
|
# instance.old_flavor field to None before the migration status
|
|
# is "confirmed" so if we did not find the flavor in the outgoing
|
|
# resized instance we won't track it.
|
|
if itype:
|
|
LOG.debug('Starting to track outgoing migration %s with '
|
|
'flavor %s', migration.uuid, itype.flavorid,
|
|
instance=instance)
|
|
|
|
if itype:
|
|
cn = self.compute_nodes[nodename]
|
|
usage = self._get_usage_dict(
|
|
itype, instance, numa_topology=numa_topology)
|
|
if self.pci_tracker and sign:
|
|
self.pci_tracker.update_pci_for_instance(
|
|
context, instance, sign=sign)
|
|
self._update_usage(usage, nodename)
|
|
if self.pci_tracker:
|
|
obj = self.pci_tracker.stats.to_device_pools_obj()
|
|
cn.pci_device_pools = obj
|
|
else:
|
|
obj = objects.PciDevicePoolList()
|
|
cn.pci_device_pools = obj
|
|
self.tracked_migrations[uuid] = migration
|
|
|
|
def _update_usage_from_migrations(self, context, migrations, nodename):
|
|
filtered = {}
|
|
instances = {}
|
|
self.tracked_migrations.clear()
|
|
|
|
# do some defensive filtering against bad migrations records in the
|
|
# database:
|
|
for migration in migrations:
|
|
uuid = migration.instance_uuid
|
|
|
|
try:
|
|
if uuid not in instances:
|
|
instances[uuid] = migration.instance
|
|
except exception.InstanceNotFound as e:
|
|
# migration referencing deleted instance
|
|
LOG.debug('Migration instance not found: %s', e)
|
|
continue
|
|
|
|
# Skip migation if instance is neither in a resize state nor is
|
|
# live-migrating.
|
|
if (not _instance_in_resize_state(instances[uuid]) and not
|
|
_instance_is_live_migrating(instances[uuid])):
|
|
LOG.debug('Skipping migration as instance is neither '
|
|
'resizing nor live-migrating.', instance_uuid=uuid)
|
|
continue
|
|
|
|
# filter to most recently updated migration for each instance:
|
|
other_migration = filtered.get(uuid, None)
|
|
# NOTE(claudiub): In Python 3, you cannot compare NoneTypes.
|
|
if other_migration:
|
|
om = other_migration
|
|
other_time = om.updated_at or om.created_at
|
|
migration_time = migration.updated_at or migration.created_at
|
|
if migration_time > other_time:
|
|
filtered[uuid] = migration
|
|
else:
|
|
filtered[uuid] = migration
|
|
|
|
for migration in filtered.values():
|
|
instance = instances[migration.instance_uuid]
|
|
# Skip migration (and mark it as error) if it doesn't match the
|
|
# instance migration id.
|
|
# This can happen if we have a stale migration record.
|
|
# We want to proceed if instance.migration_context is None
|
|
if (instance.migration_context is not None and
|
|
instance.migration_context.migration_id != migration.id):
|
|
LOG.info("Current instance migration %(im)s doesn't match "
|
|
"migration %(m)s, marking migration as error. "
|
|
"This can occur if a previous migration for this "
|
|
"instance did not complete.",
|
|
{'im': instance.migration_context.migration_id,
|
|
'm': migration.id})
|
|
migration.status = "error"
|
|
migration.save()
|
|
continue
|
|
|
|
try:
|
|
self._update_usage_from_migration(context, instance, migration,
|
|
nodename)
|
|
except exception.FlavorNotFound:
|
|
LOG.warning("Flavor could not be found, skipping migration.",
|
|
instance_uuid=instance.uuid)
|
|
continue
|
|
|
|
def _update_usage_from_instance(self, context, instance, nodename,
|
|
is_removed=False):
|
|
"""Update usage for a single instance."""
|
|
|
|
uuid = instance['uuid']
|
|
is_new_instance = uuid not in self.tracked_instances
|
|
# NOTE(sfinucan): Both brand new instances as well as instances that
|
|
# are being unshelved will have is_new_instance == True
|
|
is_removed_instance = not is_new_instance and (is_removed or
|
|
instance['vm_state'] in vm_states.ALLOW_RESOURCE_REMOVAL)
|
|
|
|
if is_new_instance:
|
|
self.tracked_instances.add(uuid)
|
|
sign = 1
|
|
|
|
if is_removed_instance:
|
|
self.tracked_instances.remove(uuid)
|
|
self._release_assigned_resources(instance.resources)
|
|
sign = -1
|
|
|
|
cn = self.compute_nodes[nodename]
|
|
stats = self.stats[nodename]
|
|
stats.update_stats_for_instance(instance, is_removed_instance)
|
|
cn.stats = stats
|
|
|
|
# if it's a new or deleted instance:
|
|
if is_new_instance or is_removed_instance:
|
|
if self.pci_tracker:
|
|
self.pci_tracker.update_pci_for_instance(context,
|
|
instance,
|
|
sign=sign)
|
|
# new instance, update compute node resource usage:
|
|
self._update_usage(self._get_usage_dict(instance, instance),
|
|
nodename, sign=sign)
|
|
|
|
# Stop tracking removed instances in the is_bfv cache. This needs to
|
|
# happen *after* calling _get_usage_dict() since that relies on the
|
|
# is_bfv cache.
|
|
if is_removed_instance and uuid in self.is_bfv:
|
|
del self.is_bfv[uuid]
|
|
|
|
cn.current_workload = stats.calculate_workload()
|
|
if self.pci_tracker:
|
|
obj = self.pci_tracker.stats.to_device_pools_obj()
|
|
cn.pci_device_pools = obj
|
|
else:
|
|
cn.pci_device_pools = objects.PciDevicePoolList()
|
|
|
|
def _update_usage_from_instances(self, context, instances, nodename):
|
|
"""Calculate resource usage based on instance utilization. This is
|
|
different than the hypervisor's view as it will account for all
|
|
instances assigned to the local compute host, even if they are not
|
|
currently powered on.
|
|
"""
|
|
self.tracked_instances.clear()
|
|
|
|
cn = self.compute_nodes[nodename]
|
|
# set some initial values, reserve room for host/hypervisor:
|
|
cn.local_gb_used = CONF.reserved_host_disk_mb / 1024
|
|
cn.memory_mb_used = CONF.reserved_host_memory_mb
|
|
cn.vcpus_used = CONF.reserved_host_cpus
|
|
cn.free_ram_mb = (cn.memory_mb - cn.memory_mb_used)
|
|
cn.free_disk_gb = (cn.local_gb - cn.local_gb_used)
|
|
cn.current_workload = 0
|
|
cn.running_vms = 0
|
|
|
|
instance_by_uuid = {}
|
|
for instance in instances:
|
|
if instance.vm_state not in vm_states.ALLOW_RESOURCE_REMOVAL:
|
|
self._update_usage_from_instance(context, instance, nodename)
|
|
instance_by_uuid[instance.uuid] = instance
|
|
return instance_by_uuid
|
|
|
|
def _remove_deleted_instances_allocations(self, context, cn,
|
|
migrations, instance_by_uuid):
|
|
migration_uuids = [migration.uuid for migration in migrations
|
|
if 'uuid' in migration]
|
|
# NOTE(jaypipes): All of this code sucks. It's basically dealing with
|
|
# all the corner cases in move, local delete, unshelve and rebuild
|
|
# operations for when allocations should be deleted when things didn't
|
|
# happen according to the normal flow of events where the scheduler
|
|
# always creates allocations for an instance
|
|
try:
|
|
# pai: report.ProviderAllocInfo namedtuple
|
|
pai = self.reportclient.get_allocations_for_resource_provider(
|
|
context, cn.uuid)
|
|
except (exception.ResourceProviderAllocationRetrievalFailed,
|
|
ks_exc.ClientException) as e:
|
|
LOG.error("Skipping removal of allocations for deleted instances: "
|
|
"%s", e)
|
|
return
|
|
allocations = pai.allocations
|
|
if not allocations:
|
|
# The main loop below would short-circuit anyway, but this saves us
|
|
# the (potentially expensive) context.elevated construction below.
|
|
return
|
|
read_deleted_context = context.elevated(read_deleted='yes')
|
|
for consumer_uuid, alloc in allocations.items():
|
|
if consumer_uuid in self.tracked_instances:
|
|
LOG.debug("Instance %s actively managed on this compute host "
|
|
"and has allocations in placement: %s.",
|
|
consumer_uuid, alloc)
|
|
continue
|
|
if consumer_uuid in migration_uuids:
|
|
LOG.debug("Migration %s is active on this compute host "
|
|
"and has allocations in placement: %s.",
|
|
consumer_uuid, alloc)
|
|
continue
|
|
|
|
# We know these are instances now, so proceed
|
|
instance_uuid = consumer_uuid
|
|
instance = instance_by_uuid.get(instance_uuid)
|
|
if not instance:
|
|
try:
|
|
instance = objects.Instance.get_by_uuid(
|
|
read_deleted_context, consumer_uuid,
|
|
expected_attrs=[])
|
|
except exception.InstanceNotFound:
|
|
# The instance isn't even in the database. Either the
|
|
# scheduler _just_ created an allocation for it and we're
|
|
# racing with the creation in the cell database, or the
|
|
# instance was deleted and fully archived before we got a
|
|
# chance to run this. The former is far more likely than
|
|
# the latter. Avoid deleting allocations for a building
|
|
# instance here.
|
|
LOG.info("Instance %(uuid)s has allocations against this "
|
|
"compute host but is not found in the database.",
|
|
{'uuid': instance_uuid},
|
|
exc_info=False)
|
|
continue
|
|
|
|
if instance.deleted:
|
|
# The instance is gone, so we definitely want to remove
|
|
# allocations associated with it.
|
|
# NOTE(jaypipes): This will not be true if/when we support
|
|
# cross-cell migrations...
|
|
LOG.debug("Instance %s has been deleted (perhaps locally). "
|
|
"Deleting allocations that remained for this "
|
|
"instance against this compute host: %s.",
|
|
instance_uuid, alloc)
|
|
self.reportclient.delete_allocation_for_instance(context,
|
|
instance_uuid)
|
|
continue
|
|
if not instance.host:
|
|
# Allocations related to instances being scheduled should not
|
|
# be deleted if we already wrote the allocation previously.
|
|
LOG.debug("Instance %s has been scheduled to this compute "
|
|
"host, the scheduler has made an allocation "
|
|
"against this compute node but the instance has "
|
|
"yet to start. Skipping heal of allocation: %s.",
|
|
instance_uuid, alloc)
|
|
continue
|
|
if (instance.host == cn.host and
|
|
instance.node == cn.hypervisor_hostname):
|
|
# The instance is supposed to be on this compute host but is
|
|
# not in the list of actively managed instances. This could be
|
|
# because we are racing with an instance_claim call during
|
|
# initial build or unshelve where the instance host/node is set
|
|
# before the instance is added to tracked_instances. If the
|
|
# task_state is set, then consider things in motion and log at
|
|
# debug level instead of warning.
|
|
if instance.task_state:
|
|
LOG.debug('Instance with task_state "%s" is not being '
|
|
'actively managed by this compute host but has '
|
|
'allocations referencing this compute node '
|
|
'(%s): %s. Skipping heal of allocations during '
|
|
'the task state transition.',
|
|
instance.task_state, cn.uuid, alloc,
|
|
instance=instance)
|
|
else:
|
|
LOG.warning("Instance %s is not being actively managed by "
|
|
"this compute host but has allocations "
|
|
"referencing this compute host: %s. Skipping "
|
|
"heal of allocation because we do not know "
|
|
"what to do.", instance_uuid, alloc)
|
|
continue
|
|
if instance.host != cn.host:
|
|
# The instance has been moved to another host either via a
|
|
# migration, evacuation or unshelve in between the time when we
|
|
# ran InstanceList.get_by_host_and_node(), added those
|
|
# instances to RT.tracked_instances and the above
|
|
# Instance.get_by_uuid() call. We SHOULD attempt to remove any
|
|
# allocations that reference this compute host if the VM is in
|
|
# a stable terminal state (i.e. it isn't in a state of waiting
|
|
# for resize to confirm/revert), however if the destination
|
|
# host is an Ocata compute host, it will delete the allocation
|
|
# that contains this source compute host information anyway and
|
|
# recreate an allocation that only refers to itself. So we
|
|
# don't need to do anything in that case. Just log the
|
|
# situation here for information but don't attempt to delete or
|
|
# change the allocation.
|
|
LOG.warning("Instance %s has been moved to another host "
|
|
"%s(%s). There are allocations remaining against "
|
|
"the source host that might need to be removed: "
|
|
"%s.",
|
|
instance_uuid, instance.host, instance.node, alloc)
|
|
|
|
def delete_allocation_for_evacuated_instance(self, context, instance, node,
|
|
node_type='source'):
|
|
# Clean up the instance allocation from this node in placement
|
|
cn_uuid = self.compute_nodes[node].uuid
|
|
if not self.reportclient.remove_provider_tree_from_instance_allocation(
|
|
context, instance.uuid, cn_uuid):
|
|
LOG.error("Failed to clean allocation of evacuated "
|
|
"instance on the %s node %s",
|
|
node_type, cn_uuid, instance=instance)
|
|
|
|
def _find_orphaned_instances(self):
|
|
"""Given the set of instances and migrations already account for
|
|
by resource tracker, sanity check the hypervisor to determine
|
|
if there are any "orphaned" instances left hanging around.
|
|
|
|
Orphans could be consuming memory and should be accounted for in
|
|
usage calculations to guard against potential out of memory
|
|
errors.
|
|
"""
|
|
uuids1 = frozenset(self.tracked_instances)
|
|
uuids2 = frozenset(self.tracked_migrations.keys())
|
|
uuids = uuids1 | uuids2
|
|
|
|
usage = self.driver.get_per_instance_usage()
|
|
vuuids = frozenset(usage.keys())
|
|
|
|
orphan_uuids = vuuids - uuids
|
|
orphans = [usage[uuid] for uuid in orphan_uuids]
|
|
|
|
return orphans
|
|
|
|
def _update_usage_from_orphans(self, orphans, nodename):
|
|
"""Include orphaned instances in usage."""
|
|
for orphan in orphans:
|
|
memory_mb = orphan['memory_mb']
|
|
|
|
LOG.warning("Detected running orphan instance: %(uuid)s "
|
|
"(consuming %(memory_mb)s MB memory)",
|
|
{'uuid': orphan['uuid'], 'memory_mb': memory_mb})
|
|
|
|
# just record memory usage for the orphan
|
|
usage = {'memory_mb': memory_mb}
|
|
self._update_usage(usage, nodename)
|
|
|
|
def delete_allocation_for_shelve_offloaded_instance(self, context,
|
|
instance):
|
|
self.reportclient.delete_allocation_for_instance(context,
|
|
instance.uuid)
|
|
|
|
def _verify_resources(self, resources):
|
|
resource_keys = ["vcpus", "memory_mb", "local_gb", "cpu_info",
|
|
"vcpus_used", "memory_mb_used", "local_gb_used",
|
|
"numa_topology"]
|
|
|
|
missing_keys = [k for k in resource_keys if k not in resources]
|
|
if missing_keys:
|
|
reason = _("Missing keys: %s") % missing_keys
|
|
raise exception.InvalidInput(reason=reason)
|
|
|
|
def _get_instance_type(self, instance, prefix, migration):
|
|
"""Get the instance type from instance."""
|
|
stashed_flavors = migration.migration_type in ('resize',)
|
|
if stashed_flavors:
|
|
return getattr(instance, '%sflavor' % prefix)
|
|
else:
|
|
# NOTE(ndipanov): Certain migration types (all but resize)
|
|
# do not change flavors so there is no need to stash
|
|
# them. In that case - just get the instance flavor.
|
|
return instance.flavor
|
|
|
|
def _get_usage_dict(self, object_or_dict, instance, **updates):
|
|
"""Make a usage dict _update methods expect.
|
|
|
|
Accepts a dict or an Instance or Flavor object, and a set of updates.
|
|
Converts the object to a dict and applies the updates.
|
|
|
|
:param object_or_dict: instance or flavor as an object or just a dict
|
|
:param instance: nova.objects.Instance for the related operation; this
|
|
is needed to determine if the instance is
|
|
volume-backed
|
|
:param updates: key-value pairs to update the passed object.
|
|
Currently only considers 'numa_topology', all other
|
|
keys are ignored.
|
|
|
|
:returns: a dict with all the information from object_or_dict updated
|
|
with updates
|
|
"""
|
|
|
|
def _is_bfv():
|
|
# Check to see if we have the is_bfv value cached.
|
|
if instance.uuid in self.is_bfv:
|
|
is_bfv = self.is_bfv[instance.uuid]
|
|
else:
|
|
is_bfv = compute_utils.is_volume_backed_instance(
|
|
instance._context, instance)
|
|
self.is_bfv[instance.uuid] = is_bfv
|
|
return is_bfv
|
|
|
|
usage = {}
|
|
if isinstance(object_or_dict, objects.Instance):
|
|
is_bfv = _is_bfv()
|
|
usage = {'memory_mb': object_or_dict.flavor.memory_mb,
|
|
'swap': object_or_dict.flavor.swap,
|
|
'vcpus': object_or_dict.flavor.vcpus,
|
|
'root_gb': (0 if is_bfv else
|
|
object_or_dict.flavor.root_gb),
|
|
'ephemeral_gb': object_or_dict.flavor.ephemeral_gb,
|
|
'numa_topology': object_or_dict.numa_topology}
|
|
elif isinstance(object_or_dict, objects.Flavor):
|
|
usage = obj_base.obj_to_primitive(object_or_dict)
|
|
if _is_bfv():
|
|
usage['root_gb'] = 0
|
|
else:
|
|
usage.update(object_or_dict)
|
|
|
|
for key in ('numa_topology',):
|
|
if key in updates:
|
|
usage[key] = updates[key]
|
|
return usage
|
|
|
|
def build_failed(self, nodename):
|
|
"""Increments the failed_builds stats for the given node."""
|
|
self.stats[nodename].build_failed()
|
|
|
|
def build_succeeded(self, nodename):
|
|
"""Resets the failed_builds stats for the given node."""
|
|
self.stats[nodename].build_succeeded()
|
|
|
|
@utils.synchronized(COMPUTE_RESOURCE_SEMAPHORE)
|
|
def claim_pci_devices(self, context, pci_requests):
|
|
"""Claim instance PCI resources
|
|
|
|
:param context: security context
|
|
:param pci_requests: a list of nova.objects.InstancePCIRequests
|
|
:returns: a list of nova.objects.PciDevice objects
|
|
"""
|
|
result = self.pci_tracker.claim_instance(
|
|
context, pci_requests, None)
|
|
self.pci_tracker.save(context)
|
|
return result
|
|
|
|
@utils.synchronized(COMPUTE_RESOURCE_SEMAPHORE)
|
|
def allocate_pci_devices_for_instance(self, context, instance):
|
|
"""Allocate instance claimed PCI resources
|
|
|
|
:param context: security context
|
|
:param instance: instance object
|
|
"""
|
|
self.pci_tracker.allocate_instance(instance)
|
|
self.pci_tracker.save(context)
|
|
|
|
@utils.synchronized(COMPUTE_RESOURCE_SEMAPHORE)
|
|
def free_pci_device_allocations_for_instance(self, context, instance):
|
|
"""Free instance allocated PCI resources
|
|
|
|
:param context: security context
|
|
:param instance: instance object
|
|
"""
|
|
self.pci_tracker.free_instance_allocations(context, instance)
|
|
self.pci_tracker.save(context)
|
|
|
|
@utils.synchronized(COMPUTE_RESOURCE_SEMAPHORE)
|
|
def free_pci_device_claims_for_instance(self, context, instance):
|
|
"""Free instance claimed PCI resources
|
|
|
|
:param context: security context
|
|
:param instance: instance object
|
|
"""
|
|
self.pci_tracker.free_instance_claims(context, instance)
|
|
self.pci_tracker.save(context)
|