1550 lines
71 KiB
Python
1550 lines
71 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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import retrying
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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 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 rc_fields as fields
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from nova import rpc
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from nova.scheduler import client as scheduler_client
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from nova.scheduler import utils as scheduler_utils
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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]
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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 _is_trackable_migration(migration):
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# Only look at resize/migrate migration and evacuation records
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# NOTE(danms): RT should probably examine live migration
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# records as well and do something smart. However, ignore
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# those for now to avoid them being included in below calculations.
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return migration.migration_type in ('resize', 'migration',
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'evacuation')
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def _normalize_inventory_from_cn_obj(inv_data, cn):
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"""Helper function that injects various information from a compute node
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object into the inventory dict returned from the virt driver's
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get_inventory() method. This function allows us to marry information like
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*_allocation_ratio and reserved memory amounts that are in the
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compute_nodes DB table and that the virt driver doesn't know about with the
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information the virt driver *does* know about.
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Note that if the supplied inv_data contains allocation_ratio, reserved or
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other fields, we DO NOT override the value with that of the compute node.
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This is to ensure that the virt driver is the single source of truth
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regarding inventory information. For instance, the Ironic virt driver will
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always return a very specific inventory with allocation_ratios pinned to
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1.0.
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:param inv_data: Dict, keyed by resource class, of inventory information
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returned from virt driver's get_inventory() method
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:param compute_node: `objects.ComputeNode` describing the compute node
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"""
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if fields.ResourceClass.VCPU in inv_data:
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cpu_inv = inv_data[fields.ResourceClass.VCPU]
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if 'allocation_ratio' not in cpu_inv:
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cpu_inv['allocation_ratio'] = cn.cpu_allocation_ratio
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if 'reserved' not in cpu_inv:
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cpu_inv['reserved'] = CONF.reserved_host_cpus
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if fields.ResourceClass.MEMORY_MB in inv_data:
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mem_inv = inv_data[fields.ResourceClass.MEMORY_MB]
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if 'allocation_ratio' not in mem_inv:
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mem_inv['allocation_ratio'] = cn.ram_allocation_ratio
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if 'reserved' not in mem_inv:
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mem_inv['reserved'] = CONF.reserved_host_memory_mb
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if fields.ResourceClass.DISK_GB in inv_data:
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disk_inv = inv_data[fields.ResourceClass.DISK_GB]
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if 'allocation_ratio' not in disk_inv:
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disk_inv['allocation_ratio'] = cn.disk_allocation_ratio
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if 'reserved' not in disk_inv:
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# TODO(johngarbutt) We should either move to reserved_host_disk_gb
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# or start tracking DISK_MB.
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reserved_mb = CONF.reserved_host_disk_mb
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reserved_gb = compute_utils.convert_mb_to_ceil_gb(reserved_mb)
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disk_inv['reserved'] = reserved_gb
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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):
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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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self.tracked_instances = {}
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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.scheduler_client = scheduler_client.SchedulerClient()
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self.reportclient = self.scheduler_client.reportclient
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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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def get_node_uuid(self, nodename):
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try:
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return self.compute_nodes[nodename].uuid
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except KeyError:
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raise exception.ComputeHostNotFound(host=nodename)
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@utils.synchronized(COMPUTE_RESOURCE_SEMAPHORE)
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def instance_claim(self, context, instance, nodename, 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 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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# get the overhead required to build this instance:
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overhead = self.driver.estimate_instance_overhead(instance)
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LOG.debug("Memory overhead for %(flavor)d MB instance; %(overhead)d "
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"MB", {'flavor': instance.flavor.memory_mb,
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'overhead': overhead['memory_mb']})
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LOG.debug("Disk overhead for %(flavor)d GB instance; %(overhead)d "
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"GB", {'flavor': instance.flavor.root_gb,
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'overhead': overhead.get('disk_gb', 0)})
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LOG.debug("CPU overhead for %(flavor)d vCPUs instance; %(overhead)d "
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"vCPU(s)", {'flavor': instance.flavor.vcpus,
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'overhead': overhead.get('vcpus', 0)})
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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, overhead=overhead, 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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# 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, limits=None,
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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, 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, image_meta=None, limits=None):
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"""Create a claim for a resize or cold-migration move."""
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return self._move_claim(context, instance, instance_type, nodename,
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migration, image_meta=image_meta,
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limits=limits)
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def _move_claim(self, context, instance, new_instance_type, nodename,
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migration, move_type=None, 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 image_meta: instance image metadata
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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 limits: Dict of oversubscription limits for memory, disk,
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and CPUs
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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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: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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# get memory overhead required to build this instance:
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overhead = self.driver.estimate_instance_overhead(new_instance_type)
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LOG.debug("Memory overhead for %(flavor)d MB instance; %(overhead)d "
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"MB", {'flavor': new_instance_type.memory_mb,
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'overhead': overhead['memory_mb']})
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LOG.debug("Disk overhead for %(flavor)d GB instance; %(overhead)d "
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"GB", {'flavor': instance.flavor.root_gb,
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'overhead': overhead.get('disk_gb', 0)})
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LOG.debug("CPU overhead for %(flavor)d vCPUs instance; %(overhead)d "
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"vCPU(s)", {'flavor': instance.flavor.vcpus,
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'overhead': overhead.get('vcpus', 0)})
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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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# PCI requests come from two sources: instance flavor and
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# SR-IOV ports. SR-IOV ports pci_request don't have an alias_name.
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# On resize merge the SR-IOV ports pci_requests with the new
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# 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.alias_name is None:
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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, overhead=overhead,
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limits=limits)
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claim.migration = migration
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claimed_pci_devices_objs = []
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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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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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# 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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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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migration.status = 'pre-migrating'
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migration.save()
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def _set_instance_host_and_node(self, instance, nodename):
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"""Tag the instance as belonging to this host. This should be done
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while the COMPUTE_RESOURCES_SEMAPHORE is held so the resource claim
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will not be lost if the audit process starts.
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"""
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instance.host = self.host
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instance.launched_on = self.host
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instance.node = nodename
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instance.save()
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def _unset_instance_host_and_node(self, instance):
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"""Untag the instance so it no longer belongs to the host.
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This should be done while the COMPUTE_RESOURCES_SEMAPHORE is held so
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the resource claim will not be lost if the audit process starts.
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"""
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instance.host = None
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instance.node = None
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instance.save()
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@utils.synchronized(COMPUTE_RESOURCE_SEMAPHORE)
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def abort_instance_claim(self, context, instance, nodename):
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"""Remove usage from the given instance."""
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self._update_usage_from_instance(context, instance, nodename,
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is_removed=True)
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instance.clear_numa_topology()
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self._unset_instance_host_and_node(instance)
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self._update(context.elevated(), self.compute_nodes[nodename])
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def _drop_pci_devices(self, instance, nodename, prefix):
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if self.pci_tracker:
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# free old/new allocated pci devices
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pci_devices = self._get_migration_context_resource(
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'pci_devices', instance, prefix=prefix)
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if pci_devices:
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for pci_device in pci_devices:
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self.pci_tracker.free_device(pci_device, instance)
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dev_pools_obj = self.pci_tracker.stats.to_device_pools_obj()
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self.compute_nodes[nodename].pci_device_pools = dev_pools_obj
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@utils.synchronized(COMPUTE_RESOURCE_SEMAPHORE)
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def drop_move_claim(self, context, instance, nodename,
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instance_type=None, prefix='new_'):
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# Remove usage for an incoming/outgoing migration on the destination
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# node.
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if instance['uuid'] in self.tracked_migrations:
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migration = self.tracked_migrations.pop(instance['uuid'])
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if not instance_type:
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ctxt = context.elevated()
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instance_type = self._get_instance_type(ctxt, instance, prefix,
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migration)
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if instance_type is not None:
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numa_topology = self._get_migration_context_resource(
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'numa_topology', instance, prefix=prefix)
|
|
usage = self._get_usage_dict(
|
|
instance_type, instance, numa_topology=numa_topology)
|
|
self._drop_pci_devices(instance, nodename, prefix)
|
|
self._update_usage(usage, nodename, sign=-1)
|
|
|
|
ctxt = context.elevated()
|
|
self._update(ctxt, self.compute_nodes[nodename])
|
|
# 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.pop(instance['uuid'])
|
|
self._drop_pci_devices(instance, nodename, prefix)
|
|
# TODO(lbeliveau): Validate if numa needs the same treatment.
|
|
|
|
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
|
|
"""
|
|
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
|
|
|
|
# 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
|
|
|
|
if self._check_for_nodes_rebalance(context, resources, nodename):
|
|
return
|
|
|
|
# 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)
|
|
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)
|
|
|
|
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):
|
|
"""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 0.0; the
|
|
# ComputeNode._from_db_object method takes care of providing default
|
|
# allocation ratios when the config is left at the 0.0 default, so
|
|
# we'll really end up with something like a
|
|
# ComputeNode.cpu_allocation_ratio of 16.0, not 0.0. We want to avoid
|
|
# resetting the ComputeNode fields to 0.0 because that will make
|
|
# the _resource_change method think something changed when really it
|
|
# didn't.
|
|
# TODO(mriedem): Will this break any scenarios where an operator is
|
|
# trying to *reset* the allocation ratios by changing config from
|
|
# non-0.0 back to 0.0? Maybe we should only do this if the fields on
|
|
# the ComputeNode object are not already set. For example, let's say
|
|
# the cpu_allocation_ratio config was 1.0 and then the operator wants
|
|
# to get back to the default (16.0 via the facade), and to do that they
|
|
# change the config back to 0.0 (or just unset the config option).
|
|
# Should we support that or treat these config options as "sticky" in
|
|
# that once you start setting them, you can't go back to the implied
|
|
# defaults by unsetting or resetting to 0.0? Sort of like how
|
|
# per-tenant quota is sticky once you change it in the API.
|
|
for res in ('cpu', 'disk', 'ram'):
|
|
attr = '%s_allocation_ratio' % res
|
|
conf_alloc_ratio = getattr(self, attr)
|
|
if conf_alloc_ratio != 0.0:
|
|
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):
|
|
"""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.
|
|
"""
|
|
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)
|
|
|
|
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):
|
|
|
|
# initialize the compute node object, creating it
|
|
# if it does not already exist.
|
|
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'])
|
|
|
|
# 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)
|
|
|
|
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 the compute_node
|
|
self._update(context, cn)
|
|
LOG.debug('Compute_service record updated for %(host)s:%(node)s',
|
|
{'host': self.host, 'node': nodename})
|
|
|
|
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.info("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 _update_to_placement(self, context, compute_node):
|
|
"""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 get_inventory(). So even there
|
|
# is no resource change for compute_node as above, we need proceed
|
|
# to get inventory and use scheduler_client interfaces to update
|
|
# inventory to placement. It's scheduler_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
|
|
# First try update_provider_tree
|
|
# 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.
|
|
reportclient = self.scheduler_client.reportclient
|
|
prov_tree = 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.
|
|
try:
|
|
self.driver.update_provider_tree(prov_tree, nodename)
|
|
# We need to normalize inventory data for the compute node provider
|
|
# (inject allocation ratio and reserved amounts from the
|
|
# compute_node record if not set by the virt driver) because the
|
|
# virt driver does not and will not have access to the compute_node
|
|
inv_data = prov_tree.data(nodename).inventory
|
|
# TODO(mriedem): Stop calling _normalize_inventory_from_cn_obj when
|
|
# a virt driver implements update_provider_tree() since we expect
|
|
# the driver to manage the allocation ratios and reserved resource
|
|
# amounts.
|
|
_normalize_inventory_from_cn_obj(inv_data, compute_node)
|
|
prov_tree.update_inventory(nodename, inv_data)
|
|
# Flush any changes.
|
|
reportclient.update_from_provider_tree(context, prov_tree)
|
|
except NotImplementedError:
|
|
# update_provider_tree isn't implemented yet - try get_inventory
|
|
try:
|
|
inv_data = self.driver.get_inventory(nodename)
|
|
_normalize_inventory_from_cn_obj(inv_data, compute_node)
|
|
self.scheduler_client.set_inventory_for_provider(
|
|
context,
|
|
compute_node.uuid,
|
|
compute_node.hypervisor_hostname,
|
|
inv_data,
|
|
)
|
|
except NotImplementedError:
|
|
# Eventually all virt drivers will return an inventory dict in
|
|
# the format that the placement API expects and we'll be able
|
|
# to remove this code branch
|
|
self.scheduler_client.update_compute_node(context,
|
|
compute_node)
|
|
|
|
@retrying.retry(stop_max_attempt_number=4,
|
|
retry_on_exception=lambda e: isinstance(
|
|
e, exception.ResourceProviderUpdateConflict))
|
|
def _update(self, context, compute_node):
|
|
"""Update partial stats locally and populate them to Scheduler."""
|
|
if self._resource_change(compute_node):
|
|
# If the compute_node's resource changed, update to DB.
|
|
# NOTE(jianghuaw): Once we completely move to use get_inventory()
|
|
# for all resource provider's inv data. We can remove this check.
|
|
# At the moment we still need this check and save compute_node.
|
|
compute_node.save()
|
|
|
|
self._update_to_placement(context, compute_node)
|
|
|
|
if self.pci_tracker:
|
|
self.pci_tracker.save(context)
|
|
|
|
def _update_usage(self, usage, nodename, sign=1):
|
|
mem_usage = usage['memory_mb']
|
|
disk_usage = usage.get('root_gb', 0)
|
|
vcpus_usage = usage.get('vcpus', 0)
|
|
|
|
overhead = self.driver.estimate_instance_overhead(usage)
|
|
mem_usage += overhead['memory_mb']
|
|
disk_usage += overhead.get('disk_gb', 0)
|
|
vcpus_usage += overhead.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
|
|
free = sign == -1
|
|
updated_numa_topology = hardware.get_host_numa_usage_from_instance(
|
|
cn, usage, free)
|
|
cn.numa_topology = updated_numa_topology
|
|
|
|
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.
|
|
"""
|
|
if not _is_trackable_migration(migration):
|
|
return
|
|
|
|
uuid = migration.instance_uuid
|
|
LOG.info("Updating resource usage from migration", 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)
|
|
|
|
record = self.tracked_instances.get(uuid, None)
|
|
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(context, 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(context, instance, 'old_',
|
|
migration)
|
|
numa_topology = self._get_migration_context_resource(
|
|
'numa_topology', instance, prefix='old_')
|
|
|
|
elif incoming and not record:
|
|
# instance has not yet migrated here:
|
|
itype = self._get_instance_type(context, instance, 'new_',
|
|
migration)
|
|
numa_topology = self._get_migration_context_resource(
|
|
'numa_topology', instance)
|
|
# Allocate pci device(s) for the instance.
|
|
sign = 1
|
|
|
|
elif outbound and not record:
|
|
# instance migrated, but record usage for a possible revert:
|
|
itype = self._get_instance_type(context, instance, 'old_',
|
|
migration)
|
|
numa_topology = self._get_migration_context_resource(
|
|
'numa_topology', instance, prefix='old_')
|
|
|
|
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 migration if instance isn't in a resize state:
|
|
if not _instance_in_resize_state(instances[uuid]):
|
|
LOG.warning("Instance not resizing, skipping migration.",
|
|
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, require_allocation_refresh=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[uuid] = obj_base.obj_to_primitive(instance)
|
|
sign = 1
|
|
|
|
if is_removed_instance:
|
|
self.tracked_instances.pop(uuid)
|
|
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)
|
|
if require_allocation_refresh:
|
|
LOG.debug("Auto-correcting allocations.")
|
|
self.reportclient.update_instance_allocation(context, cn,
|
|
instance, 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
|
|
|
|
# NOTE(jaypipes): In Pike, we need to be tolerant of Ocata compute
|
|
# nodes that overwrite placement allocations to look like what the
|
|
# resource tracker *thinks* is correct. When an instance is
|
|
# migrated from an Ocata compute node to a Pike compute node, the
|
|
# Pike scheduler will have created a "doubled-up" allocation that
|
|
# contains allocated resources against both the source and
|
|
# destination hosts. The Ocata source compute host, during its
|
|
# update_available_resource() periodic call will find the instance
|
|
# in its list of known instances and will call
|
|
# update_instance_allocation() in the report client. That call will
|
|
# pull the allocations for the instance UUID which will contain
|
|
# both the source and destination host providers in the allocation
|
|
# set. Seeing that this is different from what the Ocata source
|
|
# host thinks it should be and will overwrite the allocation to
|
|
# only be an allocation against itself.
|
|
#
|
|
# And therefore, here we need to have Pike compute hosts
|
|
# "correct" the improper healing that the Ocata source host did
|
|
# during its periodic interval. When the instance is fully migrated
|
|
# to the Pike compute host, the Ocata compute host will find an
|
|
# allocation that refers to itself for an instance it no longer
|
|
# controls and will *delete* all allocations that refer to that
|
|
# instance UUID, assuming that the instance has been deleted. We
|
|
# need the destination Pike compute host to recreate that
|
|
# allocation to refer to its own resource provider UUID.
|
|
#
|
|
# For Pike compute nodes that migrate to either a Pike compute host
|
|
# or a Queens compute host, we do NOT want the Pike compute host to
|
|
# be "healing" allocation information. Instead, we rely on the Pike
|
|
# scheduler to properly create allocations during scheduling.
|
|
#
|
|
# Pike compute hosts may still rework an
|
|
# allocation for an instance in a move operation during
|
|
# confirm_resize() on the source host which will remove the
|
|
# source resource provider from any allocation for an
|
|
# instance.
|
|
#
|
|
# In Queens and beyond, the scheduler will understand when
|
|
# a move operation has been requested and instead of
|
|
# creating a doubled-up allocation that contains both the
|
|
# source and destination host, the scheduler will take the
|
|
# original allocation (against the source host) and change
|
|
# the consumer ID of that allocation to be the migration
|
|
# UUID and not the instance UUID. The scheduler will
|
|
# allocate the resources for the destination host to the
|
|
# instance UUID.
|
|
|
|
# Some drivers (ironic) still need the allocations to be
|
|
# fixed up, as they transition the way their inventory is reported.
|
|
require_allocation_refresh = self.driver.requires_allocation_refresh
|
|
|
|
if require_allocation_refresh:
|
|
msg_allocation_refresh = (
|
|
"Compute driver requires allocation refresh. "
|
|
"Will auto-correct allocations to handle "
|
|
"Ocata-style assumptions.")
|
|
else:
|
|
msg_allocation_refresh = (
|
|
"Compute driver doesn't require allocation refresh and we're "
|
|
"on a compute host in a deployment that only has compute "
|
|
"hosts with Nova versions >=16 (Pike). Skipping "
|
|
"auto-correction of allocations.")
|
|
|
|
instance_by_uuid = {}
|
|
for instance in instances:
|
|
if instance.vm_state not in vm_states.ALLOW_RESOURCE_REMOVAL:
|
|
if msg_allocation_refresh:
|
|
LOG.debug(msg_allocation_refresh)
|
|
msg_allocation_refresh = False
|
|
|
|
self._update_usage_from_instance(context, instance, nodename,
|
|
require_allocation_refresh=require_allocation_refresh)
|
|
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
|
|
known_instances = set(self.tracked_instances.keys())
|
|
allocations = self.reportclient.get_allocations_for_resource_provider(
|
|
context, cn.uuid) or {}
|
|
read_deleted_context = context.elevated(read_deleted='yes')
|
|
for consumer_uuid, alloc in allocations.items():
|
|
if consumer_uuid in known_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.
|
|
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'):
|
|
self._delete_allocation_for_moved_instance(
|
|
context, instance, node, 'evacuated', node_type)
|
|
|
|
def delete_allocation_for_migrated_instance(self, context, instance, node):
|
|
self._delete_allocation_for_moved_instance(context, instance, node,
|
|
'migrated')
|
|
|
|
def _delete_allocation_for_moved_instance(
|
|
self, context, instance, node, move_type, node_type='source'):
|
|
# Clean up the instance allocation from this node in placement
|
|
cn_uuid = self.compute_nodes[node].uuid
|
|
if not scheduler_utils.remove_allocation_from_compute(
|
|
context, instance, cn_uuid, self.reportclient):
|
|
LOG.error("Failed to clean allocation of %s "
|
|
"instance on the %s node %s",
|
|
move_type, node_type, cn_uuid, instance=instance)
|
|
|
|
def delete_allocation_for_failed_resize(self, context, instance, node,
|
|
flavor):
|
|
"""Delete instance allocations for the node during a failed resize
|
|
|
|
:param context: The request context.
|
|
:param instance: The instance being resized/migrated.
|
|
:param node: The node provider on which the instance should have
|
|
allocations to remove. If this is a resize to the same host, then
|
|
the new_flavor resources are subtracted from the single allocation.
|
|
:param flavor: This is the new_flavor during a resize.
|
|
"""
|
|
cn = self.compute_nodes[node]
|
|
if not scheduler_utils.remove_allocation_from_compute(
|
|
context, instance, cn.uuid, self.reportclient, flavor):
|
|
if instance.instance_type_id == flavor.id:
|
|
operation = 'migration'
|
|
else:
|
|
operation = 'resize'
|
|
LOG.error('Failed to clean allocation after a failed '
|
|
'%(operation)s on node %(node)s',
|
|
{'operation': operation, 'node': 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.keys())
|
|
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, context, 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()
|