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|
#
# -------------------------------------------------------------------------
# Copyright (c) 2019 AT&T Intellectual Property
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# -------------------------------------------------------------------------
#
import copy
import operator
from valet.engine.app_manager.server import Server
from valet.engine.resource_manager.resources.datacenter import Datacenter
from valet.engine.search.avail_resources import AvailResources
from valet.engine.search.constraint_solver import ConstraintSolver
from valet.engine.search.resource import GroupResource, HostResource
from valet.engine.search.search_helper import *
class Search(object):
"""Bin-packing approach in the hierachical datacenter layout."""
def __init__(self, _logger):
self.logger = _logger
# Search inputs
self.app = None
self.resource = None
# Snapshot of current resource status
self.avail_hosts = {}
self.avail_groups = {}
# Search results
self.node_placements = {}
self.prior_placements = {} # TODO
self.num_of_hosts = 0
# Optimization criteria
self.CPU_weight = -1
self.mem_weight = -1
self.local_disk_weight = -1
self.constraint_solver = None
def _init_search(self, _app):
"""Init the search information and the output results."""
self.app = _app
self.resource = _app.resource
self.avail_hosts.clear()
self.avail_groups.clear()
self.node_placements.clear()
self.prior_placements.clear() # TODO
self.num_of_hosts = 0
self.CPU_weight = -1
self.mem_weight = -1
self.local_disk_weight = -1
self.constraint_solver = ConstraintSolver(self.logger)
self._create_avail_groups()
self._create_avail_hosts()
# TODO
# if len(self.app.old_vm_map) > 0:
# self._adjust_resources()
self._set_resource_weights()
def _create_avail_groups(self):
"""Collect all available resource groups.
Group type is affinity, diversity, quorum-diversity, exclusivity,
availability-zone, host-aggregate, server-group.
"""
for gk, g in self.resource.groups.items():
if g.status != "enabled":
self.logger.debug("group (" + g.name + ") disabled")
continue
gr = GroupResource()
gr.name = gk
gr.group_type = g.group_type
gr.factory = g.factory
if g.level is not None:
gr.level = g.level
else:
gr.level = "host"
for mk, mv in g.metadata.items():
gr.metadata[mk] = mv
gr.original_num_of_placed_servers = len(g.server_list)
gr.num_of_placed_servers = len(g.server_list)
for hk in g.member_hosts.keys():
gr.num_of_placed_servers_of_host[hk] = len(g.member_hosts[hk])
self.avail_groups[gk] = gr
def _create_avail_hosts(self):
"""Create all available hosts."""
for hk, host in self.resource.hosts.items():
if not host.is_available():
self.logger.warning("host (" + host.name + ") not available at this time")
continue
hr = HostResource()
hr.host_name = hk
for mk in host.memberships.keys():
if mk in self.avail_groups.keys():
hr.host_memberships[mk] = self.avail_groups[mk]
# Not used by Valet, only capacity planning
try:
for htk, ht in host.candidate_host_types.items():
hr.candidate_host_types[htk] = copy.deepcopy(ht)
except AttributeError:
hr.candidate_host_types = {}
hr.host_avail_vCPUs = host.avail_vCPUs
hr.host_avail_mem = host.avail_mem_cap
hr.host_avail_local_disk = host.avail_local_disk_cap
hr.NUMA = host.NUMA # NOTE: refer to host's NUMA, instead of deepcopy.
hr.host_num_of_placed_servers = len(host.server_list)
rack = host.host_group
if isinstance(rack, Datacenter):
hr.rack_name = "any"
else:
if not rack.is_available():
continue
hr.rack_name = rack.name
for mk in rack.memberships.keys():
if mk in self.avail_groups.keys():
hr.rack_memberships[mk] = self.avail_groups[mk]
hr.rack_avail_vCPUs = rack.avail_vCPUs
hr.rack_avail_mem = rack.avail_mem_cap
hr.rack_avail_local_disk = rack.avail_local_disk_cap
hr.rack_num_of_placed_servers = len(rack.server_list)
if hr.host_num_of_placed_servers > 0:
self.num_of_hosts += 1
self.avail_hosts[hk] = hr
def _set_resource_weights(self):
"""Compute weight of each resource type.
As larger weight, as more important resource to be considered.
"""
denominator = 0.0
for _, w in self.app.optimization_priority:
denominator += w
for t, w in self.app.optimization_priority:
if t == "cpu":
self.CPU_weight = float(w / denominator)
elif t == "mem":
self.mem_weight = float(w / denominator)
elif t == "lvol":
self.local_disk_weight = float(w / denominator)
def place(self, _app):
"""Determine placements of new app creation."""
self._init_search(_app)
self.logger.info("search......")
open_node_list = self._open_list(self.app.servers, self.app.groups)
avail_resources = AvailResources(LEVEL[len(LEVEL) - 1])
avail_resources.avail_hosts = self.avail_hosts
avail_resources.set_next_level() # NOTE(Gueyoung): skip 'cluster' level
return self._run_greedy(open_node_list, avail_resources, "new")
# TODO: for update opt.
def re_place(self, _app_topology):
pass
def _re_place(self):
pass
def _open_list(self, _servers, _groups):
"""Extract all servers and groups of each level (rack, host)."""
open_node_list = []
for _, s in _servers.items():
self._set_node_weight(s)
open_node_list.append(s)
for _, g in _groups.items():
self._set_node_weight(g)
open_node_list.append(g)
return open_node_list
def _set_node_weight(self, _v):
"""Compute each server's or group's weight.
As larger weight, as more important one to be considered.
"""
_v.sort_base = -1
_v.sort_base = self.CPU_weight * _v.vCPU_weight
_v.sort_base += self.mem_weight * _v.mem_weight
_v.sort_base += self.local_disk_weight * _v.local_volume_weight
# TODO: for update opt.
def _open_prior_list(self, _vms, _groups):
pass
def _adjust_resources(self):
pass
def _run_greedy(self, _open_node_list, _avail_resources, _mode):
"""Search placements with greedy algorithm."""
_open_node_list.sort(key=operator.attrgetter("sort_base"), reverse=True)
for n in _open_node_list:
self.logger.debug("open node = " + n.vid + " cpus = " + str(n.vCPUs) + " sort = " + str(n.sort_base))
while len(_open_node_list) > 0:
n = _open_node_list.pop(0)
# TODO
# if _mode == "new":
best_resource = self._get_best_resource(n, _avail_resources, _mode)
# else:
# best_resource = self._get_best_resource_for_prior(n, _avail_resources, _mode)
if best_resource is None:
self.logger.error(self.app.status)
return False
else:
self._deduct_resources(_avail_resources.level, best_resource, n, _mode)
# TODO
# if _mode == "new":
self._close_node_placement(_avail_resources.level, best_resource, n)
# else:
# self._close_prior_placement(_avail_resources.level, best_resource, n)
return True
def _get_best_resource(self, _n, _avail_resources, _mode):
"""Ddetermine the best placement for given server or affinity group."""
candidate_list = []
prior_resource = None
# If this is already placed one
if _n in self.prior_placements.keys():
prior_resource = _avail_resources.get_candidate(self.prior_placements[_n])
candidate_list.append(prior_resource)
else:
# TODO: need a list of candidates given as input?
_avail_resources.set_candidates()
candidate_list = self.constraint_solver.get_candidate_list(_n,
_avail_resources,
self.avail_hosts,
self.avail_groups)
if len(candidate_list) == 0:
if self.app.status == "ok":
if self.constraint_solver.status != "ok":
self.app.status = self.constraint_solver.status
else:
self.app.status = "fail while getting candidate hosts"
return None
if len(candidate_list) > 1:
self._set_compute_sort_base(_avail_resources.level, candidate_list)
candidate_list.sort(key=operator.attrgetter("sort_base"))
for c in candidate_list:
rn = c.get_resource_name(_avail_resources.level)
avail_cpus = c.get_vcpus(_avail_resources.level)
self.logger.debug("candidate = " + rn + " cpus = " + str(avail_cpus) + " sort = " + str(c.sort_base))
best_resource = None
if _avail_resources.level == "host" and isinstance(_n, Server):
best_resource = copy.deepcopy(candidate_list[0])
best_resource.level = "host"
else:
while len(candidate_list) > 0:
cr = candidate_list.pop(0)
(servers, groups) = get_next_placements(_n, _avail_resources.level)
open_node_list = self._open_list(servers, groups)
avail_resources = AvailResources(_avail_resources.level)
resource_name = cr.get_resource_name(_avail_resources.level)
avail_resources.set_next_avail_hosts(_avail_resources.avail_hosts, resource_name)
avail_resources.set_next_level()
# Recursive call
if self._run_greedy(open_node_list, avail_resources, _mode):
best_resource = copy.deepcopy(cr)
best_resource.level = _avail_resources.level
break
else:
if prior_resource is None:
self.logger.warning("rollback candidate = " + resource_name)
self._rollback_resources(_n)
self._rollback_node_placement(_n)
# TODO(Gueyoung): how to track the original error status?
if len(candidate_list) > 0 and self.app.status != "ok":
self.app.status = "ok"
else:
break
if best_resource is None and len(candidate_list) == 0:
if self.app.status == "ok":
self.app.status = "no available hosts"
self.logger.warning(self.app.status)
return best_resource
# TODO: for update opt.
def _get_best_resource_for_prior(self, _n, _avail_resources, _mode):
pass
def _set_compute_sort_base(self, _level, _candidate_list):
"""Compute the weight of each candidate host."""
for c in _candidate_list:
cpu_ratio = -1
mem_ratio = -1
local_disk_ratio = -1
if _level == "rack":
cpu_ratio = float(c.rack_avail_vCPUs) / float(self.resource.CPU_avail)
mem_ratio = float(c.rack_avail_mem) / float(self.resource.mem_avail)
local_disk_ratio = float(c.rack_avail_local_disk) / float(self.resource.local_disk_avail)
elif _level == "host":
cpu_ratio = float(c.host_avail_vCPUs) / float(self.resource.CPU_avail)
mem_ratio = float(c.host_avail_mem) / float(self.resource.mem_avail)
local_disk_ratio = float(c.host_avail_local_disk) / float(self.resource.local_disk_avail)
c.sort_base = (1.0 - self.CPU_weight) * cpu_ratio + \
(1.0 - self.mem_weight) * mem_ratio + \
(1.0 - self.local_disk_weight) * local_disk_ratio
def _deduct_resources(self, _level, _best, _n, _mode):
"""Apply new placement to hosting resources and groups."""
# Check if the chosen host is already applied.
if _mode == "new":
if _n in self.prior_placements.keys():
return
else:
if _n in self.node_placements.keys():
if _best.level == self.node_placements[_n].level:
return
else:
if _n in self.prior_placements.keys():
if _best.level == self.prior_placements[_n].level:
return
# Apply this placement to valet groups.
exclusivities = _n.get_exclusivities(_level)
if len(exclusivities) == 1:
exclusivity_group = exclusivities[exclusivities.keys()[0]]
self._add_exclusivity(_best, exclusivity_group)
if isinstance(_n, Group):
self._add_group(_level, _best, _n)
if len(_n.diversity_groups) > 0:
for _, div_group in _n.diversity_groups.items():
self._add_group(_level, _best, div_group)
if len(_n.quorum_diversity_groups) > 0:
for _, div_group in _n.quorum_diversity_groups.items():
self._add_group(_level, _best, div_group)
# Apply this placement to hosting resources.
if isinstance(_n, Server) and _level == "host":
self._deduct_server_resources(_best, _n)
def _add_exclusivity(self, _best, _group):
"""Add new exclusivity group."""
if _group.vid not in self.avail_groups.keys():
gr = GroupResource()
gr.name = _group.vid
gr.group_type = "exclusivity"
gr.factory = "valet"
gr.level = _group.level
self.avail_groups[gr.name] = gr
self.logger.info("find exclusivity (" + _group.vid + ")")
else:
gr = self.avail_groups[_group.vid]
gr.num_of_placed_servers += 1
host_name = _best.get_resource_name(_group.level)
if host_name not in gr.num_of_placed_servers_of_host.keys():
gr.num_of_placed_servers_of_host[host_name] = 0
gr.num_of_placed_servers_of_host[host_name] += 1
chosen_host = self.avail_hosts[_best.host_name]
if _group.level == "host":
if _group.vid not in chosen_host.host_memberships.keys():
chosen_host.host_memberships[_group.vid] = gr
for _, np in self.avail_hosts.items():
if chosen_host.rack_name != "any" and np.rack_name == chosen_host.rack_name:
if _group.vid not in np.rack_memberships.keys():
np.rack_memberships[_group.vid] = gr
else: # Rack level
for _, np in self.avail_hosts.items():
if chosen_host.rack_name != "any" and np.rack_name == chosen_host.rack_name:
if _group.vid not in np.rack_memberships.keys():
np.rack_memberships[_group.vid] = gr
def _add_group(self, _level, _best, _group):
"""Add new valet group."""
if _group.vid not in self.avail_groups.keys():
gr = GroupResource()
gr.name = _group.vid
gr.group_type = _group.group_type
gr.factory = _group.factory
gr.level = _group.level
self.avail_groups[gr.name] = gr
self.logger.info("find " + _group.group_type + " (" + _group.vid + ")")
else:
gr = self.avail_groups[_group.vid]
if _group.level == _level:
gr.num_of_placed_servers += 1
host_name = _best.get_resource_name(_level)
if host_name not in gr.num_of_placed_servers_of_host.keys():
gr.num_of_placed_servers_of_host[host_name] = 0
gr.num_of_placed_servers_of_host[host_name] += 1
chosen_host = self.avail_hosts[_best.host_name]
if _level == "host":
if _group.vid not in chosen_host.host_memberships.keys():
chosen_host.host_memberships[_group.vid] = gr
for _, np in self.avail_hosts.items():
if chosen_host.rack_name != "any" and np.rack_name == chosen_host.rack_name:
if _group.vid not in np.rack_memberships.keys():
np.rack_memberships[_group.vid] = gr
else: # Rack level
for _, np in self.avail_hosts.items():
if chosen_host.rack_name != "any" and np.rack_name == chosen_host.rack_name:
if _group.vid not in np.rack_memberships.keys():
np.rack_memberships[_group.vid] = gr
def _deduct_server_resources(self, _best, _n):
"""Apply the reduced amount of resources to the chosen host.
_n is a server and _best is a compute host.
"""
chosen_host = self.avail_hosts[_best.host_name]
chosen_host.host_avail_vCPUs -= _n.vCPUs
chosen_host.host_avail_mem -= _n.mem
chosen_host.host_avail_local_disk -= _n.local_volume_size
# Apply placement decision into NUMA
if _n.need_numa_alignment():
s_info = {}
s_info["stack_id"] = "none"
s_info["stack_name"] = self.app.app_name
s_info["uuid"] = "none"
s_info["name"] = _n.name
s_info["vcpus"] = _n.vCPUs
s_info["mem"] = _n.mem
chosen_host.NUMA.deduct_server_resources(s_info)
# TODO: need non_NUMA server?
# else:
# chosen_host.NUMA.apply_cpus_fairly(_n.vCPUs)
# chosen_host.NUMA.apply_mem_fairly(_n.mem)
if chosen_host.host_num_of_placed_servers == 0:
self.num_of_hosts += 1
chosen_host.host_num_of_placed_servers += 1
for _, np in self.avail_hosts.items():
if chosen_host.rack_name != "any" and np.rack_name == chosen_host.rack_name:
np.rack_avail_vCPUs -= _n.vCPUs
np.rack_avail_mem -= _n.mem
np.rack_avail_local_disk -= _n.local_volume_size
np.rack_num_of_placed_servers += 1
def _close_node_placement(self, _level, _best, _v):
"""Record the final placement decision."""
if _v not in self.node_placements.keys() and _v not in self.prior_placements.keys():
if _level == "host" or isinstance(_v, Group):
self.node_placements[_v] = _best
def _close_prior_placement(self, _level, _best, _v):
"""Set the decision for placed server or group."""
if _v not in self.prior_placements.keys():
if _level == "host" or isinstance(_v, Group):
self.prior_placements[_v] = _best
def _rollback_resources(self, _v):
"""Rollback the placement."""
if isinstance(_v, Server):
self._rollback_server_resources(_v)
elif isinstance(_v, Group):
for _, v in _v.subgroups.items():
self._rollback_resources(v)
if _v in self.node_placements.keys():
chosen_host = self.avail_hosts[self.node_placements[_v].host_name]
level = self.node_placements[_v].level
if isinstance(_v, Group):
self._remove_group(chosen_host, _v, level)
exclusivities = _v.get_exclusivities(level)
if len(exclusivities) == 1:
ex_group = exclusivities[exclusivities.keys()[0]]
self._remove_exclusivity(chosen_host, ex_group)
if len(_v.diversity_groups) > 0:
for _, div_group in _v.diversity_groups.items():
self._remove_group(chosen_host, div_group, level)
if len(_v.quorum_diversity_groups) > 0:
for _, div_group in _v.quorum_diversity_groups.items():
self._remove_group(chosen_host, div_group, level)
def _remove_exclusivity(self, _chosen_host, _group):
"""Remove the exclusivity group."""
gr = self.avail_groups[_group.vid]
host_name = _chosen_host.get_resource_name(_group.level)
gr.num_of_placed_servers -= 1
gr.num_of_placed_servers_of_host[host_name] -= 1
if gr.num_of_placed_servers_of_host[host_name] == 0:
del gr.num_of_placed_servers_of_host[host_name]
if gr.num_of_placed_servers == 0:
del self.avail_groups[_group.vid]
if _group.level == "host":
if _chosen_host.host_num_of_placed_servers == 0 and \
_group.vid in _chosen_host.host_memberships.keys():
del _chosen_host.host_memberships[_group.vid]
for _, np in self.avail_hosts.items():
if _chosen_host.rack_name != "any" and np.rack_name == _chosen_host.rack_name:
if _group.vid in np.rack_memberships.keys():
del np.rack_memberships[_group.vid]
else: # Rack level
if _chosen_host.rack_num_of_placed_servers == 0:
for _, np in self.avail_hosts.items():
if _chosen_host.rack_name != "any" and np.rack_name == _chosen_host.rack_name:
if _group.vid in np.rack_memberships.keys():
del np.rack_memberships[_group.vid]
def _remove_group(self, _chosen_host, _group, _level):
"""Remove valet group."""
if _group.level == _level:
gr = self.avail_groups[_group.vid]
host_name = _chosen_host.get_resource_name(_level)
gr.num_of_placed_servers -= 1
gr.num_of_placed_servers_of_host[host_name] -= 1
if gr.num_of_placed_servers_of_host[host_name] == 0:
del gr.num_of_placed_servers_of_host[host_name]
if gr.num_of_placed_servers == 0:
del self.avail_groups[_group.vid]
exist_group = True
if _group.vid not in self.avail_groups.keys():
exist_group = False
else:
if host_name not in gr.num_of_placed_servers_of_host.keys():
exist_group = False
if _level == "host":
if not exist_group and _group.vid in _chosen_host.host_memberships.keys():
del _chosen_host.host_memberships[_group.vid]
for _, np in self.avail_hosts.items():
if _chosen_host.rack_name != "any" and np.rack_name == _chosen_host.rack_name:
if _group.vid in np.rack_memberships.keys():
del np.rack_memberships[_group.vid]
else: # Rack level
if not exist_group:
for _, np in self.avail_hosts.items():
if _chosen_host.rack_name != "any" and np.rack_name == _chosen_host.rack_name:
if _group.vid in np.rack_memberships.keys():
del np.rack_memberships[_group.vid]
def _rollback_server_resources(self, _v):
"""Return back the amount of resources to host."""
if _v in self.node_placements.keys():
chosen_host = self.avail_hosts[self.node_placements[_v].host_name]
chosen_host.host_avail_vCPUs += _v.vCPUs
chosen_host.host_avail_mem += _v.mem
chosen_host.host_avail_local_disk += _v.local_volume_size
# Apply rollback into NUMA
if _v.need_numa_alignment():
s_info = {}
s_info["stack_id"] = "none"
s_info["stack_name"] = self.app.app_name
s_info["uuid"] = "none"
s_info["name"] = _v.name
s_info["vcpus"] = _v.vCPUs
s_info["mem"] = _v.mem
chosen_host.NUMA.rollback_server_resources(s_info)
chosen_host.host_num_of_placed_servers -= 1
if chosen_host.host_num_of_placed_servers == 0:
self.num_of_hosts -= 1
for _, np in self.avail_hosts.items():
if chosen_host.rack_name != "any" and np.rack_name == chosen_host.rack_name:
np.rack_avail_vCPUs += _v.vCPUs
np.rack_avail_mem += _v.mem
np.rack_avail_local_disk += _v.local_volume_size
np.rack_num_of_placed_servers -= 1
# If the chosen host was a new host and its host type was unknown,
# rollback to the original unknown state.
if chosen_host.host_num_of_placed_servers == 0:
if chosen_host.old_candidate_host_types is not None and len(chosen_host.old_candidate_host_types) > 0:
flavor_type_list = _v.get_flavor_types()
ha = self.avail_groups[flavor_type_list[0]]
chosen_host.rollback_avail_resources(ha)
chosen_host.candidate_host_types = copy.deepcopy(chosen_host.old_candidate_host_types)
chosen_host.old_candidate_host_types.clear()
for hrk, hr in self.avail_hosts.items():
if hrk != chosen_host.host_name:
if hr.rack_name == chosen_host.rack_name:
hr.rollback_avail_rack_resources(ha,
chosen_host.rack_avail_vCPUs,
chosen_host.rack_avail_mem,
chosen_host.rack_avail_local_disk)
def _rollback_node_placement(self, _v):
"""Remove placement decisions."""
if _v in self.node_placements.keys():
del self.node_placements[_v]
if isinstance(_v, Group):
for _, sg in _v.subgroups.items():
self._rollback_node_placement(sg)
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