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"""This module provides the main classes for Haizea's VM Scheduler. All the
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scheduling code that decides when and where a lease is scheduled is contained
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in the VMScheduler class (except for the code that specifically decides
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what physical machines each virtual machine is mapped to, which is factored out
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into the "mapper" module). This module also provides the classes for the
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reservations that will be placed in the slot table and correspond to VMs.
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"""
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import haizea.common.constants as constants
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from haizea.common.utils import round_datetime_delta, round_datetime, estimate_transfer_time, pretty_nodemap, get_config, get_clock, get_persistence, compute_suspend_resume_time
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from haizea.core.leases import Lease, Capacity
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from haizea.core.scheduler.slottable import ResourceReservation, ResourceTuple
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from haizea.core.scheduler import ReservationEventHandler, RescheduleLeaseException, NormalEndLeaseException, EnactmentError, NotSchedulableException, InconsistentScheduleError, InconsistentLeaseStateError, MigrationResourceReservation
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from operator import attrgetter, itemgetter
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from mx.DateTime import TimeDelta
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import logging
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import operator
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class VMScheduler(object):
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"""The Haizea VM Scheduler
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This class is responsible for taking a lease and scheduling VMs to satisfy
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the requirements of that lease.
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"""
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def __init__(self, slottable, resourcepool, mapper, max_in_future):
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"""Constructor
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The constructor does little more than create the VM scheduler's
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attributes. However, it does expect (in the arguments) a fully-constructed
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SlotTable, ResourcePool, and Mapper (these are constructed in the
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Manager's constructor).
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Arguments:
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slottable -- Slot table
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resourcepool -- Resource pool where enactment commands will be sent to
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mapper -- Mapper
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"""
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self.slottable = slottable
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self.resourcepool = resourcepool
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self.mapper = mapper
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self.logger = logging.getLogger("VMSCHED")
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self.handlers = {}
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self.handlers[VMResourceReservation] = ReservationEventHandler(
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sched = self,
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on_start = VMScheduler._handle_start_vm,
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on_end = VMScheduler._handle_end_vm)
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self.handlers[ShutdownResourceReservation] = ReservationEventHandler(
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sched = self,
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on_start = VMScheduler._handle_start_shutdown,
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on_end = VMScheduler._handle_end_shutdown)
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self.handlers[SuspensionResourceReservation] = ReservationEventHandler(
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sched = self,
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on_start = VMScheduler._handle_start_suspend,
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on_end = VMScheduler._handle_end_suspend)
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self.handlers[ResumptionResourceReservation] = ReservationEventHandler(
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sched = self,
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on_start = VMScheduler._handle_start_resume,
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on_end = VMScheduler._handle_end_resume)
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self.handlers[MemImageMigrationResourceReservation] = ReservationEventHandler(
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sched = self,
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on_start = VMScheduler._handle_start_migrate,
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on_end = VMScheduler._handle_end_migrate)
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self.max_in_future = max_in_future
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self.future_leases = set()
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def schedule(self, lease, duration, nexttime, earliest, override_state = None):
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""" The scheduling function
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This particular function doesn't do much except call __schedule_asap
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and __schedule_exact (which do all the work).
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Arguments:
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lease -- Lease to schedule
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nexttime -- The next time at which the scheduler can allocate resources.
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earliest -- The earliest possible starting times on each physical node
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"""
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if lease.get_type() == Lease.BEST_EFFORT:
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return self.__schedule_asap(lease, duration, nexttime, earliest, allow_in_future = self.can_schedule_in_future())
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elif lease.get_type() == Lease.ADVANCE_RESERVATION:
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return self.__schedule_exact(lease, duration, nexttime, earliest)
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elif lease.get_type() == Lease.IMMEDIATE:
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return self.__schedule_asap(lease, duration, nexttime, earliest, allow_in_future = False)
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elif lease.get_type() == Lease.DEADLINE:
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return self.__schedule_deadline(lease, duration, nexttime, earliest, override_state)
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def estimate_migration_time(self, lease):
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""" Estimates the time required to migrate a lease's VMs
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This function conservatively estimates that all the VMs are going to
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be migrated to other nodes. Since all the transfers are intra-node,
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the bottleneck is the transfer from whatever node has the most
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memory to transfer.
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Note that this method only estimates the time to migrate the memory
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state files for the VMs. Migrating the software environment (which may
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or may not be a disk image) is the responsibility of the preparation
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scheduler, which has it's own set of migration scheduling methods.
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Arguments:
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lease -- Lease that might be migrated
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"""
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migration = get_config().get("migration")
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if migration == constants.MIGRATE_YES:
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bandwidth = self.resourcepool.info.get_migration_bandwidth()
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vmrr = lease.get_last_vmrr()
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transfer_time = 0
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for pnode in vmrr.nodes.values():
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mem = vmrr.resources_in_pnode[pnode].get_by_type(constants.RES_MEM)
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transfer_time += estimate_transfer_time(mem, bandwidth)
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return transfer_time
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elif migration == constants.MIGRATE_YES_NOTRANSFER:
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return TimeDelta(seconds=0)
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def schedule_migration(self, lease, vmrr, nexttime):
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""" Schedules migrations for a lease
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Arguments:
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lease -- Lease being migrated
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vmrr -- The VM reservation before which the migration will take place
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nexttime -- The next time at which the scheduler can allocate resources.
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"""
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last_vmrr = lease.get_last_vmrr()
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vnode_mappings = self.resourcepool.get_ram_image_mappings(lease)
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vnode_migrations = dict([(vnode, (vnode_mappings[vnode], vmrr.nodes[vnode])) for vnode in vmrr.nodes if vnode_mappings[vnode] != vmrr.nodes[vnode]])
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mustmigrate = False
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for vnode in vnode_migrations:
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if vnode_migrations[vnode][0] != vnode_migrations[vnode][1]:
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mustmigrate = True
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break
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if not mustmigrate:
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return []
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if get_config().get("migration") == constants.MIGRATE_YES_NOTRANSFER:
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start = nexttime
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end = nexttime
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res = {}
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migr_rr = MemImageMigrationResourceReservation(lease, start, end, res, vmrr, vnode_migrations)
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migr_rr.state = ResourceReservation.STATE_SCHEDULED
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return [migr_rr]
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migrations = []
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while len(vnode_migrations) > 0:
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pnodes = set()
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migration = {}
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for vnode in vnode_migrations:
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origin = vnode_migrations[vnode][0]
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dest = vnode_migrations[vnode][1]
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if not origin in pnodes and not dest in pnodes:
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migration[vnode] = vnode_migrations[vnode]
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pnodes.add(origin)
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pnodes.add(dest)
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for vnode in migration:
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del vnode_migrations[vnode]
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migrations.append(migration)
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start = max(last_vmrr.post_rrs[-1].end, nexttime)
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bandwidth = self.resourcepool.info.get_migration_bandwidth()
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migr_rrs = []
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for m in migrations:
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vnodes_to_migrate = m.keys()
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max_mem_to_migrate = max([lease.requested_resources[vnode].get_quantity(constants.RES_MEM) for vnode in vnodes_to_migrate])
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migr_time = estimate_transfer_time(max_mem_to_migrate, bandwidth)
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end = start + migr_time
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res = {}
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for (origin,dest) in m.values():
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resorigin = Capacity([constants.RES_NETOUT])
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resorigin.set_quantity(constants.RES_NETOUT, bandwidth)
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resdest = Capacity([constants.RES_NETIN])
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resdest.set_quantity(constants.RES_NETIN, bandwidth)
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res[origin] = self.slottable.create_resource_tuple_from_capacity(resorigin)
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res[dest] = self.slottable.create_resource_tuple_from_capacity(resdest)
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migr_rr = MemImageMigrationResourceReservation(lease, start, start + migr_time, res, vmrr, m)
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migr_rr.state = ResourceReservation.STATE_SCHEDULED
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migr_rrs.append(migr_rr)
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start = end
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return migr_rrs
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def cancel_vm(self, vmrr):
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""" Cancels a VM resource reservation
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Arguments:
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vmrr -- VM RR to be cancelled
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"""
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if vmrr.lease in self.future_leases:
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self.future_leases.remove(vmrr.lease)
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get_persistence().persist_future_leases(self.future_leases)
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for rr in vmrr.pre_rrs:
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if rr.state != ResourceReservation.STATE_DONE:
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self.slottable.remove_reservation(rr)
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for rr in vmrr.post_rrs:
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self.slottable.remove_reservation(rr)
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self.slottable.remove_reservation(vmrr)
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def can_suspend_at(self, lease, t, nexttime=None):
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""" Determines if it is possible to suspend a lease before a given time
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Arguments:
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vmrr -- VM RR to be preempted
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t -- Time by which the VM must be preempted
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"""
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vmrr = lease.get_vmrr_at(t)
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if t < vmrr.start:
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return False
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by_t = min(vmrr.end, t)
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if nexttime == None:
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time_until_suspend = t - vmrr.start
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else:
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time_until_suspend = min( (t - vmrr.start, t - nexttime))
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min_duration = self.__compute_scheduling_threshold(lease)
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can_suspend = time_until_suspend >= min_duration
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return can_suspend
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def preempt_vm(self, vmrr, t):
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""" Preempts a VM reservation at a given time
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This method assumes that the lease is, in fact, preemptable,
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that the VMs are running at the given time, and that there is
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enough time to suspend the VMs before the given time (all these
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checks are done in the lease scheduler).
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Arguments:
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vmrr -- VM RR to be preempted
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t -- Time by which the VM must be preempted
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"""
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old_start = vmrr.start
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old_end = vmrr.end
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self.__schedule_suspension(vmrr, t)
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self.slottable.update_reservation(vmrr, old_start, old_end)
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for susprr in vmrr.post_rrs:
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self.slottable.add_reservation(susprr)
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def get_future_reschedulable_leases(self):
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""" Returns a list of future leases that are reschedulable.
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Currently, this list is just the best-effort leases scheduled
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in the future as determined by the backfilling algorithm.
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Advance reservation leases, by their nature, cannot be
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rescheduled to find a "better" starting time.
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"""
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return list(self.future_leases)
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def can_schedule_in_future(self):
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""" Returns True if the backfilling algorithm would allow a lease
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to be scheduled in the future.
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"""
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if self.max_in_future == -1:
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return True
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else:
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return len(self.future_leases) < self.max_in_future
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def get_utilization(self, time):
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""" Computes resource utilization (currently just CPU-based)
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This utilization information shows what
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portion of the physical resources is used by each type of reservation
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(e.g., 70% are running a VM, 5% are doing suspensions, etc.)
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Arguments:
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time -- Time at which to determine utilization
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"""
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total = self.slottable.get_total_capacity(restype = constants.RES_CPU)
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util = {}
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reservations = self.slottable.get_reservations_at(time)
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for r in reservations:
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for node in r.resources_in_pnode:
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if isinstance(r, VMResourceReservation):
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use = r.resources_in_pnode[node].get_by_type(constants.RES_CPU)
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util[type(r)] = use + util.setdefault(type(r),0.0)
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elif isinstance(r, SuspensionResourceReservation) or isinstance(r, ResumptionResourceReservation) or isinstance(r, ShutdownResourceReservation):
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use = r.vmrr.resources_in_pnode[node].get_by_type(constants.RES_CPU)
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util[type(r)] = 0.0
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util[None] = total - sum(util.values())
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if total != 0:
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for k in util:
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util[k] /= total
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return util
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def __schedule_exact(self, lease, duration, nexttime, earliest):
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""" Schedules VMs that must start at an exact time
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This type of lease is "easy" to schedule because we know the exact
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start time, which means that's the only starting time we have to
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check. So, this method does little more than call the mapper.
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Arguments:
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lease -- Lease to schedule
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nexttime -- The next time at which the scheduler can allocate resources.
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earliest -- The earliest possible starting times on each physical node
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"""
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shutdown_time = lease.estimate_shutdown_time()
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start = lease.start.requested
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end = start + lease.duration.requested + shutdown_time
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requested_resources = dict([(k,self.slottable.create_resource_tuple_from_capacity(v)) for k,v in lease.requested_resources.items()])
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mapping, actualend, preemptions = self.mapper.map(lease,
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requested_resources,
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start,
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end,
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strictend = True,
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allow_preemption = True)
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if mapping == None:
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raise NotSchedulableException, "Not enough resources in specified interval"
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res = {}
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for (vnode,pnode) in mapping.items():
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vnode_res = requested_resources[vnode]
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if res.has_key(pnode):
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res[pnode].incr(vnode_res)
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else:
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res[pnode] = ResourceTuple.copy(vnode_res)
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vmrr = VMResourceReservation(lease, start, end, mapping, res)
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vmrr.state = ResourceReservation.STATE_SCHEDULED
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self.__schedule_shutdown(vmrr)
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return vmrr, preemptions
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def __schedule_asap(self, lease, duration, nexttime, earliest, allow_in_future = None, override_state = None):
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""" Schedules VMs as soon as possible
|
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This method is a bit more complex that __schedule_exact because
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we need to figure out what "as soon as possible" actually is.
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This involves attempting several mappings, at different points
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in time, before we can schedule the lease.
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This method will always check, at least, if the lease can be scheduled
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at the earliest possible moment at which the lease could be prepared
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(e.g., if the lease can't start until 1 hour in the future because that's
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the earliest possible time at which the disk images it requires can
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be transferred, then that's when the scheduler will check). Note, however,
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that this "earliest possible moment" is determined by the preparation
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scheduler.
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Additionally, if the lease can't be scheduled at the earliest
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possible moment, it can also check if the lease can be scheduled
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in the future. This partially implements a backfilling algorithm
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(the maximum number of future leases is stored in the max_in_future
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attribute of VMScheduler), the other part being implemented in the
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423
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__process_queue method of LeaseScheduler.
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424
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|
425
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Note that, if the method is allowed to scheduled in the future,
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and assuming that the lease doesn't request more resources than
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the site itself, this method will always schedule the VMs succesfully
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428
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(since there's always an empty spot somewhere in the future).
|
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|
|
430
|
|
431
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Arguments:
|
432
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lease -- Lease to schedule
|
433
|
nexttime -- The next time at which the scheduler can allocate resources.
|
434
|
earliest -- The earliest possible starting times on each physical node
|
435
|
allow_in_future -- Boolean indicating whether the scheduler is
|
436
|
allowed to schedule the VMs in the future.
|
437
|
"""
|
438
|
|
439
|
|
440
|
|
441
|
|
442
|
|
443
|
lease_id = lease.id
|
444
|
remaining_duration = duration
|
445
|
shutdown_time = lease.estimate_shutdown_time()
|
446
|
|
447
|
if override_state != None:
|
448
|
state = override_state
|
449
|
else:
|
450
|
state = lease.get_state()
|
451
|
|
452
|
|
453
|
|
454
|
|
455
|
mustresume = (state in (Lease.STATE_SUSPENDED_PENDING, Lease.STATE_SUSPENDED_QUEUED, Lease.STATE_SUSPENDED_SCHEDULED))
|
456
|
|
457
|
|
458
|
|
459
|
min_duration = self.__compute_scheduling_threshold(lease)
|
460
|
|
461
|
|
462
|
|
463
|
|
464
|
|
465
|
|
466
|
|
467
|
|
468
|
|
469
|
|
470
|
|
471
|
|
472
|
|
473
|
|
474
|
|
475
|
|
476
|
|
477
|
if not mustresume:
|
478
|
|
479
|
|
480
|
cps = [(node, e.time) for node, e in earliest.items()]
|
481
|
cps.sort(key=itemgetter(1))
|
482
|
curcp = None
|
483
|
changepoints = []
|
484
|
nodes = []
|
485
|
for node, time in cps:
|
486
|
nodes.append(node)
|
487
|
if time != curcp:
|
488
|
changepoints.append([time, set(nodes)])
|
489
|
curcp = time
|
490
|
else:
|
491
|
changepoints[-1][1] = set(nodes)
|
492
|
else:
|
493
|
|
494
|
|
495
|
|
496
|
if get_config().get("migration") == constants.MIGRATE_NO:
|
497
|
vmrr = lease.get_last_vmrr()
|
498
|
onlynodes = set(vmrr.nodes.values())
|
499
|
else:
|
500
|
onlynodes = None
|
501
|
changepoints = list(set([x.time for x in earliest.values()]))
|
502
|
changepoints.sort()
|
503
|
changepoints = [(x, onlynodes) for x in changepoints]
|
504
|
|
505
|
|
506
|
|
507
|
if allow_in_future:
|
508
|
res = self.slottable.get_reservations_ending_after(changepoints[-1][0])
|
509
|
|
510
|
|
511
|
futurecp = [r.get_final_end() for r in res if isinstance(r, VMResourceReservation)]
|
512
|
|
513
|
|
514
|
futurecp += [r.end for r in res if isinstance(r, ShutdownResourceReservation) and not r.vmrr in res]
|
515
|
if not mustresume:
|
516
|
futurecp = [(p,None) for p in futurecp]
|
517
|
else:
|
518
|
futurecp = [(p,onlynodes) for p in futurecp]
|
519
|
else:
|
520
|
futurecp = []
|
521
|
|
522
|
futurecp.sort()
|
523
|
|
524
|
if lease.deadline != None:
|
525
|
changepoints = [cp for cp in changepoints if cp[0] <= lease.deadline - duration]
|
526
|
futurecp = [cp for cp in futurecp if cp[0] <= lease.deadline - duration]
|
527
|
|
528
|
|
529
|
|
530
|
|
531
|
|
532
|
|
533
|
|
534
|
|
535
|
|
536
|
|
537
|
|
538
|
if mustresume:
|
539
|
duration = remaining_duration + lease.estimate_resume_time()
|
540
|
else:
|
541
|
duration = remaining_duration
|
542
|
|
543
|
duration += shutdown_time
|
544
|
|
545
|
in_future = False
|
546
|
|
547
|
|
548
|
|
549
|
requested_resources = dict([(k,self.slottable.create_resource_tuple_from_capacity(v)) for k,v in lease.requested_resources.items()])
|
550
|
|
551
|
|
552
|
start, end, mapping, preemptions = self.__find_fit_at_points(lease,
|
553
|
requested_resources,
|
554
|
changepoints,
|
555
|
duration,
|
556
|
min_duration,
|
557
|
shutdown_time)
|
558
|
|
559
|
if start == None and not allow_in_future:
|
560
|
|
561
|
|
562
|
raise NotSchedulableException, "Could not find enough resources for this request"
|
563
|
|
564
|
|
565
|
|
566
|
if start == None and allow_in_future:
|
567
|
start, end, mapping, preemptions = self.__find_fit_at_points(lease,
|
568
|
requested_resources,
|
569
|
futurecp,
|
570
|
duration,
|
571
|
min_duration,
|
572
|
shutdown_time
|
573
|
)
|
574
|
|
575
|
|
576
|
|
577
|
if start == None:
|
578
|
if lease.deadline != None:
|
579
|
raise NotSchedulableException, "Could not find enough resources for this request before deadline"
|
580
|
else:
|
581
|
raise InconsistentScheduleError, "Could not find a mapping in the future (this should not happen)"
|
582
|
|
583
|
in_future = True
|
584
|
|
585
|
|
586
|
|
587
|
|
588
|
|
589
|
|
590
|
|
591
|
|
592
|
|
593
|
|
594
|
res = {}
|
595
|
|
596
|
for (vnode,pnode) in mapping.items():
|
597
|
vnode_res = requested_resources[vnode]
|
598
|
if res.has_key(pnode):
|
599
|
res[pnode].incr(vnode_res)
|
600
|
else:
|
601
|
res[pnode] = ResourceTuple.copy(vnode_res)
|
602
|
|
603
|
vmrr = VMResourceReservation(lease, start, end, mapping, res)
|
604
|
vmrr.state = ResourceReservation.STATE_SCHEDULED
|
605
|
|
606
|
|
607
|
if mustresume:
|
608
|
self.__schedule_resumption(vmrr, start)
|
609
|
|
610
|
|
611
|
|
612
|
mustsuspend = (vmrr.end - vmrr.start) - shutdown_time < remaining_duration
|
613
|
if mustsuspend:
|
614
|
self.__schedule_suspension(vmrr, end)
|
615
|
else:
|
616
|
|
617
|
if (vmrr.end - vmrr.start) > remaining_duration + shutdown_time:
|
618
|
vmrr.end = vmrr.start + remaining_duration + shutdown_time
|
619
|
self.__schedule_shutdown(vmrr)
|
620
|
|
621
|
if in_future:
|
622
|
self.future_leases.add(lease)
|
623
|
get_persistence().persist_future_leases(self.future_leases)
|
624
|
|
625
|
susp_str = res_str = ""
|
626
|
if mustresume:
|
627
|
res_str = " (resuming)"
|
628
|
if mustsuspend:
|
629
|
susp_str = " (suspending)"
|
630
|
self.logger.info("Lease #%i can be scheduled on nodes %s from %s%s to %s%s" % (lease.id, mapping.values(), start, res_str, end, susp_str))
|
631
|
|
632
|
return vmrr, preemptions
|
633
|
|
634
|
|
635
|
def __schedule_deadline(self, lease, duration, nexttime, earliest, override_state):
|
636
|
|
637
|
earliest_time = nexttime
|
638
|
for n in earliest:
|
639
|
earliest[n].time = max(lease.start.requested, earliest[n].time)
|
640
|
earliest_time = max(earliest_time, earliest[n].time)
|
641
|
|
642
|
slack = (lease.deadline - lease.start.requested) / lease.duration.requested
|
643
|
if slack <= 2.0:
|
644
|
try:
|
645
|
self.logger.debug("Trying to schedule lease #%i as an advance reservation..." % lease.id)
|
646
|
vmrr, preemptions = self.__schedule_exact(lease, duration, nexttime, earliest)
|
647
|
|
648
|
return vmrr, []
|
649
|
except NotSchedulableException:
|
650
|
self.logger.debug("Lease #%i cannot be scheduled as an advance reservation, trying as best-effort..." % lease.id)
|
651
|
try:
|
652
|
vmrr, preemptions = self.__schedule_asap(lease, duration, nexttime, earliest, allow_in_future = True, override_state=override_state)
|
653
|
except NotSchedulableException:
|
654
|
vmrr = None
|
655
|
preemptions = []
|
656
|
if vmrr == None or vmrr.end - vmrr.start != duration or vmrr.end > lease.deadline or len(preemptions)>0:
|
657
|
self.logger.debug("Lease #%i cannot be scheduled before deadline using best-effort." % lease.id)
|
658
|
|
659
|
else:
|
660
|
return vmrr, preemptions
|
661
|
else:
|
662
|
self.logger.debug("Trying to schedule lease #%i as best-effort..." % lease.id)
|
663
|
try:
|
664
|
vmrr, preemptions = self.__schedule_asap(lease, duration, nexttime, earliest, allow_in_future = True, override_state=override_state)
|
665
|
except NotSchedulableException:
|
666
|
vmrr = None
|
667
|
preemptions = []
|
668
|
|
669
|
if vmrr == None or vmrr.end - vmrr.start != duration or vmrr.end > lease.deadline or len(preemptions)>0:
|
670
|
self.logger.debug("Trying to schedule lease #%i by rescheduling other leases..." % lease.id)
|
671
|
dirtynodes = set()
|
672
|
dirtytime = earliest_time
|
673
|
|
674
|
future_vmrrs = self.slottable.get_reservations_on_or_after(earliest_time)
|
675
|
future_vmrrs.sort(key=operator.attrgetter("start"))
|
676
|
future_vmrrs = [rr for rr in future_vmrrs
|
677
|
if isinstance(rr, VMResourceReservation)
|
678
|
and rr.state == ResourceReservation.STATE_SCHEDULED
|
679
|
and reduce(operator.and_, [(prerr.state == ResourceReservation.STATE_SCHEDULED) for prerr in rr.pre_rrs], True)]
|
680
|
|
681
|
leases = list(set([future_vmrr.lease for future_vmrr in future_vmrrs]))
|
682
|
|
683
|
self.slottable.push_state(leases)
|
684
|
|
685
|
for future_vmrr in future_vmrrs:
|
686
|
|
687
|
future_vmrr.lease.remove_vmrr(future_vmrr)
|
688
|
self.cancel_vm(future_vmrr)
|
689
|
|
690
|
orig_vmrrs = dict([(l,[rr for rr in future_vmrrs if rr.lease == l]) for l in leases])
|
691
|
|
692
|
leases.append(lease)
|
693
|
leases.sort(key= lambda l: (l.deadline - earliest_time) / l.get_remaining_duration_at(nexttime))
|
694
|
|
695
|
new_vmrrs = {}
|
696
|
|
697
|
self.logger.debug("Attempting to reschedule leases %s" % [l.id for l in leases])
|
698
|
|
699
|
|
700
|
scheduled = set()
|
701
|
for lease2 in leases:
|
702
|
|
703
|
last_vmrr = lease2.get_last_vmrr()
|
704
|
if last_vmrr != None and last_vmrr.is_suspending():
|
705
|
override_state = Lease.STATE_SUSPENDED_PENDING
|
706
|
l_earliest_time = max(last_vmrr.post_rrs[-1].end, earliest_time)
|
707
|
else:
|
708
|
override_state = None
|
709
|
l_earliest_time = earliest_time
|
710
|
|
711
|
for n in earliest:
|
712
|
earliest[n].time = max(lease2.start.requested, l_earliest_time)
|
713
|
|
714
|
self.logger.debug("Rescheduling lease %s" % lease2.id)
|
715
|
dur = lease2.get_remaining_duration_at(l_earliest_time)
|
716
|
|
717
|
try:
|
718
|
vmrr, preemptions = self.__schedule_asap(lease2, dur, nexttime, earliest, allow_in_future = True, override_state=override_state)
|
719
|
except NotSchedulableException:
|
720
|
vmrr = None
|
721
|
preemptions = []
|
722
|
if vmrr == None or vmrr.end - vmrr.start != dur or vmrr.end > lease2.deadline or len(preemptions) != 0:
|
723
|
self.logger.debug("Lease %s could not be rescheduled, undoing changes." % lease2.id)
|
724
|
self.slottable.pop_state()
|
725
|
|
726
|
raise NotSchedulableException, "Could not schedule before deadline without making other leases miss deadline"
|
727
|
|
728
|
dirtytime = max(vmrr.end, dirtytime)
|
729
|
dirtynodes.update(vmrr.resources_in_pnode.keys())
|
730
|
|
731
|
for rr in vmrr.pre_rrs:
|
732
|
self.slottable.add_reservation(rr)
|
733
|
self.slottable.add_reservation(vmrr)
|
734
|
for rr in vmrr.post_rrs:
|
735
|
self.slottable.add_reservation(rr)
|
736
|
scheduled.add(lease2)
|
737
|
if lease2 == lease:
|
738
|
return_vmrr = vmrr
|
739
|
break
|
740
|
else:
|
741
|
new_vmrrs[lease2] = vmrr
|
742
|
|
743
|
|
744
|
|
745
|
|
746
|
|
747
|
|
748
|
to_schedule = [l for l in leases if l not in scheduled]
|
749
|
dirtynodes, cleanleases = self.find_dirty_nodes(to_schedule, dirtynodes, orig_vmrrs)
|
750
|
self.logger.debug("Rescheduling only leases on nodes %s" % dirtynodes)
|
751
|
self.logger.debug("Leases %s can be skipped" % [l.id for l in cleanleases])
|
752
|
|
753
|
|
754
|
restored_leases = set()
|
755
|
for l in leases:
|
756
|
if l in cleanleases:
|
757
|
|
758
|
for l_vmrr in orig_vmrrs[l]:
|
759
|
for rr in l_vmrr.pre_rrs:
|
760
|
self.slottable.add_reservation(rr)
|
761
|
self.slottable.add_reservation(l_vmrr)
|
762
|
for rr in l_vmrr.post_rrs:
|
763
|
self.slottable.add_reservation(rr)
|
764
|
l.append_vmrr(l_vmrr)
|
765
|
scheduled.add(l)
|
766
|
restored_leases.add(l)
|
767
|
|
768
|
to_schedule = [l for l in leases if l not in scheduled]
|
769
|
try:
|
770
|
(more_scheduled, add_vmrrs, dirtytime) = self.reschedule_deadline_leases(to_schedule, orig_vmrrs, earliest_time, earliest, nexttime, dirtytime)
|
771
|
scheduled.update(more_scheduled)
|
772
|
new_vmrrs.update(add_vmrrs)
|
773
|
except NotSchedulableException:
|
774
|
self.logger.debug("Lease %s could not be rescheduled, undoing changes." % l.id)
|
775
|
self.slottable.pop_state()
|
776
|
raise
|
777
|
|
778
|
self.slottable.pop_state(discard=True)
|
779
|
|
780
|
for l in leases:
|
781
|
if l not in scheduled:
|
782
|
for l_vmrr in orig_vmrrs[l]:
|
783
|
for rr in l_vmrr.pre_rrs:
|
784
|
self.slottable.add_reservation(rr)
|
785
|
self.slottable.add_reservation(l_vmrr)
|
786
|
for rr in l_vmrr.post_rrs:
|
787
|
self.slottable.add_reservation(rr)
|
788
|
l.append_vmrr(l_vmrr)
|
789
|
restored_leases.add(l)
|
790
|
|
791
|
for lease2, vmrr in new_vmrrs.items():
|
792
|
lease2.append_vmrr(vmrr)
|
793
|
|
794
|
|
795
|
|
796
|
for rr in return_vmrr.pre_rrs:
|
797
|
self.slottable.remove_reservation(rr)
|
798
|
self.slottable.remove_reservation(return_vmrr)
|
799
|
for rr in return_vmrr.post_rrs:
|
800
|
self.slottable.remove_reservation(rr)
|
801
|
|
802
|
for l in leases:
|
803
|
if l in scheduled:
|
804
|
self.logger.vdebug("Lease %i after rescheduling:" % l.id)
|
805
|
l.print_contents()
|
806
|
|
807
|
return return_vmrr, []
|
808
|
else:
|
809
|
return vmrr, preemptions
|
810
|
|
811
|
|
812
|
def find_dirty_nodes(self, to_schedule, dirtynodes, orig_vmrrs):
|
813
|
dirtynodes = set(dirtynodes)
|
814
|
done = False
|
815
|
while not done:
|
816
|
stable = True
|
817
|
cleanleases = set()
|
818
|
for l in to_schedule:
|
819
|
pnodes = set()
|
820
|
for l_vmrr in orig_vmrrs[l]:
|
821
|
pnodes.update(l_vmrr.resources_in_pnode.keys())
|
822
|
in_dirty = dirtynodes & pnodes
|
823
|
in_clean = pnodes - dirtynodes
|
824
|
if len(in_dirty) > 0 and len(in_clean) > 0:
|
825
|
stable = False
|
826
|
dirtynodes.update(in_clean)
|
827
|
if len(in_clean) > 0 and len(in_dirty) == 0:
|
828
|
cleanleases.add(l)
|
829
|
if stable == True:
|
830
|
done = True
|
831
|
|
832
|
return dirtynodes, cleanleases
|
833
|
|
834
|
|
835
|
def reschedule_deadline_leases(self, leases, orig_vmrrs, earliest_time, earliest, nexttime, dirtytime):
|
836
|
scheduled = set()
|
837
|
new_vmrrs = {}
|
838
|
for l in leases:
|
839
|
if len(scheduled) < len(leases) and dirtytime != None:
|
840
|
min_future_start = min([min([rr.start for rr in lrr]) for l2, lrr in orig_vmrrs.items() if l2 in leases and l2 not in scheduled])
|
841
|
if min_future_start > dirtytime:
|
842
|
break
|
843
|
|
844
|
last_vmrr = l.get_last_vmrr()
|
845
|
if last_vmrr != None and last_vmrr.is_suspending():
|
846
|
override_state = Lease.STATE_SUSPENDED_PENDING
|
847
|
l_earliest_time = max(last_vmrr.post_rrs[-1].end, earliest_time)
|
848
|
else:
|
849
|
override_state = None
|
850
|
l_earliest_time = earliest_time
|
851
|
|
852
|
for n in earliest:
|
853
|
earliest[n].time = max(l.start.requested, l_earliest_time)
|
854
|
|
855
|
self.logger.debug("Rescheduling lease %s" % l.id)
|
856
|
dur = l.get_remaining_duration_at(l_earliest_time)
|
857
|
|
858
|
try:
|
859
|
vmrr, preemptions = self.__schedule_asap(l, dur, nexttime, earliest, allow_in_future = True, override_state=override_state)
|
860
|
except NotSchedulableException:
|
861
|
vmrr = None
|
862
|
preemptions = []
|
863
|
|
864
|
if vmrr == None or vmrr.end - vmrr.start != dur or vmrr.end > l.deadline or len(preemptions) != 0:
|
865
|
raise NotSchedulableException, "Could not schedule before deadline without making other leases miss deadline"
|
866
|
|
867
|
if dirtytime != None:
|
868
|
dirtytime = max(vmrr.end, dirtytime)
|
869
|
|
870
|
for rr in vmrr.pre_rrs:
|
871
|
self.slottable.add_reservation(rr)
|
872
|
self.slottable.add_reservation(vmrr)
|
873
|
for rr in vmrr.post_rrs:
|
874
|
self.slottable.add_reservation(rr)
|
875
|
new_vmrrs[l] = vmrr
|
876
|
scheduled.add(l)
|
877
|
|
878
|
return scheduled, new_vmrrs, dirtytime
|
879
|
|
880
|
|
881
|
def reschedule_deadline(self, lease, duration, nexttime, earliest, override_state = None):
|
882
|
for n in earliest:
|
883
|
earliest[n].time = max(lease.start.requested, earliest[n].time)
|
884
|
|
885
|
try:
|
886
|
vmrr, preemptions = self.__schedule_asap(lease, duration, nexttime, earliest, allow_in_future = True, override_state=override_state)
|
887
|
except NotSchedulableException:
|
888
|
vmrr = None
|
889
|
preemptions = []
|
890
|
|
891
|
if vmrr == None or vmrr.end - vmrr.start != duration or vmrr.end > lease.deadline or len(preemptions)>0:
|
892
|
self.logger.debug("Lease #%i cannot be scheduled before deadline using best-effort." % lease.id)
|
893
|
raise NotSchedulableException, "Could not schedule before deadline without making other leases miss deadline"
|
894
|
else:
|
895
|
return vmrr, preemptions
|
896
|
|
897
|
|
898
|
|
899
|
def __find_fit_at_points(self, lease, requested_resources, changepoints, duration, min_duration, shutdown_time):
|
900
|
""" Tries to map a lease in a given list of points in time
|
901
|
|
902
|
This method goes through a given list of points in time and tries
|
903
|
to find the earliest time at which that lease can be allocated
|
904
|
resources.
|
905
|
|
906
|
Arguments:
|
907
|
lease -- Lease to schedule
|
908
|
requested_resources -- A dictionary of lease node -> ResourceTuple.
|
909
|
changepoints -- The list of changepoints
|
910
|
duration -- The amount of time requested
|
911
|
min_duration -- The minimum amount of time that should be allocated
|
912
|
|
913
|
Returns:
|
914
|
start -- The time at which resources have been found for the lease
|
915
|
actualend -- The time at which the resources won't be available. Note
|
916
|
that this is not necessarily (start + duration) since the mapper
|
917
|
might be unable to find enough resources for the full requested duration.
|
918
|
mapping -- A mapping of lease nodes to physical nodes
|
919
|
preemptions -- A list of
|
920
|
(if no mapping is found, all these values are set to None)
|
921
|
"""
|
922
|
found = False
|
923
|
|
924
|
for time, onlynodes in changepoints:
|
925
|
start = time
|
926
|
end = start + duration
|
927
|
self.logger.debug("Attempting to map from %s to %s" % (start, end))
|
928
|
|
929
|
|
930
|
|
931
|
susptype = get_config().get("suspension")
|
932
|
|
933
|
|
934
|
if susptype == constants.SUSPENSION_NONE or (lease.numnodes > 1 and susptype == constants.SUSPENSION_SERIAL) or lease.get_type() == Lease.DEADLINE:
|
935
|
strictend = True
|
936
|
else:
|
937
|
strictend = False
|
938
|
|
939
|
|
940
|
mapping, actualend, preemptions = self.mapper.map(lease,
|
941
|
requested_resources,
|
942
|
start,
|
943
|
end,
|
944
|
strictend = strictend,
|
945
|
onlynodes = onlynodes,
|
946
|
allow_preemption = False)
|
947
|
|
948
|
|
949
|
|
950
|
if mapping != None:
|
951
|
if actualend < end:
|
952
|
actualduration = actualend - start
|
953
|
if actualduration >= min_duration:
|
954
|
if duration - shutdown_time >= actualduration:
|
955
|
self.logger.debug("This lease can be scheduled from %s to %s (will require suspension)" % (start, actualend))
|
956
|
found = True
|
957
|
break
|
958
|
else:
|
959
|
self.logger.debug("This lease requires suspension, but doing so would involve 'suspending' the shutdown.")
|
960
|
else:
|
961
|
self.logger.debug("This starting time does not allow for the requested minimum duration (%s < %s)" % (actualduration, min_duration))
|
962
|
else:
|
963
|
self.logger.debug("This lease can be scheduled from %s to %s (full duration)" % (start, end))
|
964
|
found = True
|
965
|
break
|
966
|
|
967
|
if found:
|
968
|
return start, actualend, mapping, preemptions
|
969
|
else:
|
970
|
return None, None, None, None
|
971
|
|
972
|
|
973
|
def __compute_susprem_times(self, vmrr, time, direction, exclusion, rate, override = None):
|
974
|
""" Computes the times at which suspend/resume operations would have to start
|
975
|
|
976
|
When suspending or resuming a VM, the VM's memory is dumped to a
|
977
|
file on disk. To correctly estimate the time required to suspend
|
978
|
a lease with multiple VMs, Haizea makes sure that no two
|
979
|
suspensions/resumptions happen at the same time (e.g., if eight
|
980
|
memory files were being saved at the same time to disk, the disk's
|
981
|
performance would be reduced in a way that is not as easy to estimate
|
982
|
as if only one file were being saved at a time). Based on a number
|
983
|
of parameters, this method estimates the times at which the
|
984
|
suspend/resume commands would have to be sent to guarantee this
|
985
|
exclusion.
|
986
|
|
987
|
Arguments:
|
988
|
vmrr -- The VM reservation that will be suspended/resumed
|
989
|
time -- The time at which the suspend should end or the resume should start.
|
990
|
direction -- DIRECTION_BACKWARD: start at "time" and compute the times going
|
991
|
backward (for suspensions) DIRECTION_FORWARD: start at time "time" and compute
|
992
|
the times going forward.
|
993
|
exclusion -- SUSPRES_EXCLUSION_GLOBAL (memory is saved to global filesystem)
|
994
|
or SUSPRES_EXCLUSION_LOCAL (saved to local filesystem)
|
995
|
rate -- The rate at which an individual VM is suspended/resumed
|
996
|
override -- If specified, then instead of computing the time to
|
997
|
suspend/resume VM based on its memory and the "rate" parameter,
|
998
|
use this override value.
|
999
|
|
1000
|
"""
|
1001
|
times = []
|
1002
|
enactment_overhead = get_config().get("enactment-overhead")
|
1003
|
|
1004
|
if override != None:
|
1005
|
override = TimeDelta(seconds=override)
|
1006
|
|
1007
|
if exclusion == constants.SUSPRES_EXCLUSION_GLOBAL:
|
1008
|
|
1009
|
|
1010
|
|
1011
|
|
1012
|
t = time
|
1013
|
t_prev = None
|
1014
|
|
1015
|
for (vnode,pnode) in vmrr.nodes.items():
|
1016
|
if override == None:
|
1017
|
mem = vmrr.lease.requested_resources[vnode].get_quantity(constants.RES_MEM)
|
1018
|
op_time = compute_suspend_resume_time(mem, rate)
|
1019
|
else:
|
1020
|
op_time = override
|
1021
|
|
1022
|
op_time += enactment_overhead
|
1023
|
|
1024
|
t_prev = t
|
1025
|
|
1026
|
if direction == constants.DIRECTION_FORWARD:
|
1027
|
t += op_time
|
1028
|
times.append((t_prev, t, {pnode:[vnode]}))
|
1029
|
elif direction == constants.DIRECTION_BACKWARD:
|
1030
|
t -= op_time
|
1031
|
times.append((t, t_prev, {pnode:[vnode]}))
|
1032
|
|
1033
|
elif exclusion == constants.SUSPRES_EXCLUSION_LOCAL:
|
1034
|
|
1035
|
|
1036
|
|
1037
|
pervnode_times = []
|
1038
|
vnodes_in_pnode = {}
|
1039
|
for (vnode,pnode) in vmrr.nodes.items():
|
1040
|
vnodes_in_pnode.setdefault(pnode, []).append(vnode)
|
1041
|
for pnode in vnodes_in_pnode:
|
1042
|
t = time
|
1043
|
t_prev = None
|
1044
|
for vnode in vnodes_in_pnode[pnode]:
|
1045
|
if override == None:
|
1046
|
mem = vmrr.lease.requested_resources[vnode].get_quantity(constants.RES_MEM)
|
1047
|
op_time = compute_suspend_resume_time(mem, rate)
|
1048
|
else:
|
1049
|
op_time = override
|
1050
|
|
1051
|
t_prev = t
|
1052
|
|
1053
|
if direction == constants.DIRECTION_FORWARD:
|
1054
|
t += op_time
|
1055
|
pervnode_times.append((t_prev, t, vnode))
|
1056
|
elif direction == constants.DIRECTION_BACKWARD:
|
1057
|
t -= op_time
|
1058
|
pervnode_times.append((t, t_prev, vnode))
|
1059
|
|
1060
|
|
1061
|
uniq_times = set([(start, end) for (start, end, vnode) in pervnode_times])
|
1062
|
for (start, end) in uniq_times:
|
1063
|
vnodes = [x[2] for x in pervnode_times if x[0] == start and x[1] == end]
|
1064
|
node_mappings = {}
|
1065
|
for vnode in vnodes:
|
1066
|
pnode = vmrr.nodes[vnode]
|
1067
|
node_mappings.setdefault(pnode, []).append(vnode)
|
1068
|
times.append([start,end,node_mappings])
|
1069
|
|
1070
|
|
1071
|
for t in times:
|
1072
|
num_vnodes = sum([len(vnodes) for vnodes in t[2].values()])
|
1073
|
overhead = TimeDelta(seconds = num_vnodes * enactment_overhead)
|
1074
|
if direction == constants.DIRECTION_FORWARD:
|
1075
|
t[1] += overhead
|
1076
|
elif direction == constants.DIRECTION_BACKWARD:
|
1077
|
t[0] -= overhead
|
1078
|
|
1079
|
|
1080
|
if direction == constants.DIRECTION_FORWARD:
|
1081
|
times.sort(key=itemgetter(0))
|
1082
|
elif direction == constants.DIRECTION_BACKWARD:
|
1083
|
times.sort(key=itemgetter(1))
|
1084
|
times.reverse()
|
1085
|
|
1086
|
prev_start = None
|
1087
|
prev_end = None
|
1088
|
for t in times:
|
1089
|
if prev_start != None:
|
1090
|
start = t[0]
|
1091
|
end = t[1]
|
1092
|
if direction == constants.DIRECTION_FORWARD:
|
1093
|
if start < prev_end:
|
1094
|
diff = prev_end - start
|
1095
|
t[0] += diff
|
1096
|
t[1] += diff
|
1097
|
elif direction == constants.DIRECTION_BACKWARD:
|
1098
|
if end > prev_start:
|
1099
|
diff = end - prev_start
|
1100
|
t[0] -= diff
|
1101
|
t[1] -= diff
|
1102
|
prev_start = t[0]
|
1103
|
prev_end = t[1]
|
1104
|
|
1105
|
return times
|
1106
|
|
1107
|
|
1108
|
def __schedule_shutdown(self, vmrr):
|
1109
|
""" Schedules the shutdown of a VM reservation
|
1110
|
|
1111
|
Arguments:
|
1112
|
vmrr -- The VM reservation that will be shutdown
|
1113
|
|
1114
|
"""
|
1115
|
shutdown_time = vmrr.lease.estimate_shutdown_time()
|
1116
|
|
1117
|
start = vmrr.end - shutdown_time
|
1118
|
end = vmrr.end
|
1119
|
|
1120
|
shutdown_rr = ShutdownResourceReservation(vmrr.lease, start, end, vmrr.resources_in_pnode, vmrr.nodes, vmrr)
|
1121
|
shutdown_rr.state = ResourceReservation.STATE_SCHEDULED
|
1122
|
|
1123
|
vmrr.update_end(start)
|
1124
|
|
1125
|
|
1126
|
for rr in vmrr.post_rrs:
|
1127
|
self.slottable.remove_reservation(rr)
|
1128
|
vmrr.post_rrs = []
|
1129
|
|
1130
|
vmrr.post_rrs.append(shutdown_rr)
|
1131
|
|
1132
|
|
1133
|
def __schedule_suspension(self, vmrr, suspend_by):
|
1134
|
""" Schedules the suspension of a VM reservation
|
1135
|
|
1136
|
Most of the work is done in __compute_susprem_times. See that
|
1137
|
method's documentation for more details.
|
1138
|
|
1139
|
Arguments:
|
1140
|
vmrr -- The VM reservation that will be suspended
|
1141
|
suspend_by -- The time by which the VMs should be suspended.
|
1142
|
|
1143
|
"""
|
1144
|
config = get_config()
|
1145
|
susp_exclusion = config.get("suspendresume-exclusion")
|
1146
|
override = get_config().get("override-suspend-time")
|
1147
|
rate = config.get("suspend-rate")
|
1148
|
|
1149
|
if suspend_by < vmrr.start or suspend_by > vmrr.end:
|
1150
|
raise InconsistentScheduleError, "Tried to schedule a suspension by %s, which is outside the VMRR's duration (%s-%s)" % (suspend_by, vmrr.start, vmrr.end)
|
1151
|
|
1152
|
|
1153
|
times = self.__compute_susprem_times(vmrr, suspend_by, constants.DIRECTION_BACKWARD, susp_exclusion, rate, override)
|
1154
|
|
1155
|
|
1156
|
suspend_rrs = []
|
1157
|
for (start, end, node_mappings) in times:
|
1158
|
suspres = {}
|
1159
|
all_vnodes = []
|
1160
|
for (pnode,vnodes) in node_mappings.items():
|
1161
|
num_vnodes = len(vnodes)
|
1162
|
r = Capacity([constants.RES_CPU, constants.RES_MEM,constants.RES_DISK])
|
1163
|
mem = 0
|
1164
|
for vnode in vnodes:
|
1165
|
mem += vmrr.lease.requested_resources[vnode].get_quantity(constants.RES_MEM)
|
1166
|
r.set_ninstances(constants.RES_CPU, num_vnodes)
|
1167
|
for i in xrange(num_vnodes):
|
1168
|
r.set_quantity_instance(constants.RES_CPU, i +1, 100)
|
1169
|
r.set_quantity(constants.RES_MEM, mem * num_vnodes)
|
1170
|
r.set_quantity(constants.RES_DISK, mem * num_vnodes)
|
1171
|
suspres[pnode] = self.slottable.create_resource_tuple_from_capacity(r)
|
1172
|
all_vnodes += vnodes
|
1173
|
|
1174
|
susprr = SuspensionResourceReservation(vmrr.lease, start, end, suspres, all_vnodes, vmrr)
|
1175
|
susprr.state = ResourceReservation.STATE_SCHEDULED
|
1176
|
suspend_rrs.append(susprr)
|
1177
|
|
1178
|
suspend_rrs.sort(key=attrgetter("start"))
|
1179
|
|
1180
|
susp_start = suspend_rrs[0].start
|
1181
|
if susp_start < vmrr.start:
|
1182
|
raise InconsistentScheduleError, "Determined suspension should start at %s, before the VMRR's start (%s) -- Suspend time not being properly estimated?" % (susp_start, vmrr.start)
|
1183
|
|
1184
|
vmrr.update_end(susp_start)
|
1185
|
|
1186
|
|
1187
|
for rr in vmrr.post_rrs:
|
1188
|
self.slottable.remove_reservation(rr)
|
1189
|
vmrr.post_rrs = []
|
1190
|
|
1191
|
|
1192
|
for susprr in suspend_rrs:
|
1193
|
vmrr.post_rrs.append(susprr)
|
1194
|
|
1195
|
|
1196
|
def __schedule_resumption(self, vmrr, resume_at):
|
1197
|
""" Schedules the resumption of a VM reservation
|
1198
|
|
1199
|
Most of the work is done in __compute_susprem_times. See that
|
1200
|
method's documentation for more details.
|
1201
|
|
1202
|
Arguments:
|
1203
|
vmrr -- The VM reservation that will be resumed
|
1204
|
resume_at -- The time at which the resumption should start
|
1205
|
|
1206
|
"""
|
1207
|
config = get_config()
|
1208
|
resm_exclusion = config.get("suspendresume-exclusion")
|
1209
|
override = get_config().get("override-resume-time")
|
1210
|
rate = config.get("resume-rate")
|
1211
|
|
1212
|
if resume_at < vmrr.start or resume_at > vmrr.end:
|
1213
|
raise InconsistentScheduleError, "Tried to schedule a resumption at %s, which is outside the VMRR's duration (%s-%s)" % (resume_at, vmrr.start, vmrr.end)
|
1214
|
|
1215
|
|
1216
|
times = self.__compute_susprem_times(vmrr, resume_at, constants.DIRECTION_FORWARD, resm_exclusion, rate, override)
|
1217
|
|
1218
|
|
1219
|
resume_rrs = []
|
1220
|
for (start, end, node_mappings) in times:
|
1221
|
resmres = {}
|
1222
|
all_vnodes = []
|
1223
|
for (pnode,vnodes) in node_mappings.items():
|
1224
|
num_vnodes = len(vnodes)
|
1225
|
r = Capacity([constants.RES_CPU, constants.RES_MEM, constants.RES_DISK])
|
1226
|
mem = 0
|
1227
|
for vnode in vnodes:
|
1228
|
mem += vmrr.lease.requested_resources[vnode].get_quantity(constants.RES_MEM)
|
1229
|
r.set_ninstances(constants.RES_CPU, num_vnodes)
|
1230
|
for i in xrange(num_vnodes):
|
1231
|
r.set_quantity_instance(constants.RES_CPU, i +1, 100)
|
1232
|
r.set_quantity(constants.RES_MEM, mem * num_vnodes)
|
1233
|
r.set_quantity(constants.RES_DISK, mem * num_vnodes)
|
1234
|
resmres[pnode] = self.slottable.create_resource_tuple_from_capacity(r)
|
1235
|
all_vnodes += vnodes
|
1236
|
resmrr = ResumptionResourceReservation(vmrr.lease, start, end, resmres, all_vnodes, vmrr)
|
1237
|
resmrr.state = ResourceReservation.STATE_SCHEDULED
|
1238
|
resume_rrs.append(resmrr)
|
1239
|
|
1240
|
resume_rrs.sort(key=attrgetter("start"))
|
1241
|
|
1242
|
resm_end = resume_rrs[-1].end
|
1243
|
if resm_end > vmrr.end:
|
1244
|
raise InconsistentScheduleError, "Determined resumption would end at %s, after the VMRR's end (%s) -- Resume time not being properly estimated?" % (resm_end, vmrr.end)
|
1245
|
|
1246
|
vmrr.update_start(resm_end)
|
1247
|
|
1248
|
|
1249
|
for resmrr in resume_rrs:
|
1250
|
vmrr.pre_rrs.append(resmrr)
|
1251
|
|
1252
|
|
1253
|
def __compute_scheduling_threshold(self, lease):
|
1254
|
""" Compute the scheduling threshold (the 'minimum duration') of a lease
|
1255
|
|
1256
|
To avoid thrashing, Haizea will not schedule a lease unless all overheads
|
1257
|
can be correctly scheduled (which includes image transfers, suspensions, etc.).
|
1258
|
However, this can still result in situations where a lease is prepared,
|
1259
|
and then immediately suspended because of a blocking lease in the future.
|
1260
|
The scheduling threshold is used to specify that a lease must
|
1261
|
not be scheduled unless it is guaranteed to run for a minimum amount of
|
1262
|
time (the rationale behind this is that you ideally don't want leases
|
1263
|
to be scheduled if they're not going to be active for at least as much time
|
1264
|
as was spent in overheads).
|
1265
|
|
1266
|
An important part of computing this value is the "scheduling threshold factor".
|
1267
|
The default value is 1, meaning that the lease will be active for at least
|
1268
|
as much time T as was spent on overheads (e.g., if preparing the lease requires
|
1269
|
60 seconds, and we know that it will have to be suspended, requiring 30 seconds,
|
1270
|
Haizea won't schedule the lease unless it can run for at least 90 minutes).
|
1271
|
In other words, a scheduling factor of F required a minimum duration of
|
1272
|
F*T. A value of 0 could lead to thrashing, since Haizea could end up with
|
1273
|
situations where a lease starts and immediately gets suspended.
|
1274
|
|
1275
|
Arguments:
|
1276
|
lease -- Lease for which we want to find the scheduling threshold
|
1277
|
"""
|
1278
|
|
1279
|
config = get_config()
|
1280
|
threshold = config.get("force-scheduling-threshold")
|
1281
|
if threshold != None:
|
1282
|
|
1283
|
return threshold
|
1284
|
|
1285
|
if config.get("suspension") != constants.SUSPENSION_NONE:
|
1286
|
factor = config.get("scheduling-threshold-factor")
|
1287
|
|
1288
|
|
1289
|
|
1290
|
|
1291
|
susp_overhead = lease.estimate_suspend_time()
|
1292
|
safe_duration = susp_overhead
|
1293
|
|
1294
|
if lease.get_state() == Lease.STATE_SUSPENDED_QUEUED:
|
1295
|
resm_overhead = lease.estimate_resume_time()
|
1296
|
safe_duration += resm_overhead
|
1297
|
else:
|
1298
|
safe_duration = 0
|
1299
|
|
1300
|
|
1301
|
min_duration = safe_duration
|
1302
|
|
1303
|
|
1304
|
|
1305
|
|
1306
|
|
1307
|
|
1308
|
|
1309
|
|
1310
|
|
1311
|
|
1312
|
threshold = safe_duration + (min_duration * factor)
|
1313
|
return threshold
|
1314
|
|
1315
|
|
1316
|
|
1317
|
|
1318
|
|
1319
|
|
1320
|
|
1321
|
|
1322
|
def _handle_start_vm(self, l, rr):
|
1323
|
""" Handles the start of a VMResourceReservation
|
1324
|
|
1325
|
Arguments:
|
1326
|
l -- Lease the VMResourceReservation belongs to
|
1327
|
rr -- THe VMResourceReservation
|
1328
|
"""
|
1329
|
self.logger.debug("LEASE-%i Start of handleStartVM" % l.id)
|
1330
|
l.print_contents()
|
1331
|
|
1332
|
lease_state = l.get_state()
|
1333
|
|
1334
|
if get_config().get("lease-preparation") == "imagetransfer":
|
1335
|
if not self.resourcepool.verify_deploy(l, rr):
|
1336
|
self.logger.error("Deployment of lease %i was not complete." % l.id)
|
1337
|
raise
|
1338
|
|
1339
|
|
1340
|
if l.get_state() == Lease.STATE_SCHEDULED:
|
1341
|
|
1342
|
l.set_state(Lease.STATE_READY)
|
1343
|
lease_state = l.get_state()
|
1344
|
|
1345
|
if lease_state == Lease.STATE_READY:
|
1346
|
l.set_state(Lease.STATE_ACTIVE)
|
1347
|
rr.state = ResourceReservation.STATE_ACTIVE
|
1348
|
now_time = get_clock().get_time()
|
1349
|
l.start.actual = now_time
|
1350
|
|
1351
|
try:
|
1352
|
self.resourcepool.start_vms(l, rr)
|
1353
|
except EnactmentError, exc:
|
1354
|
self.logger.error("Enactment error when starting VMs.")
|
1355
|
|
1356
|
|
1357
|
|
1358
|
|
1359
|
raise
|
1360
|
|
1361
|
elif lease_state == Lease.STATE_RESUMED_READY:
|
1362
|
l.set_state(Lease.STATE_ACTIVE)
|
1363
|
rr.state = ResourceReservation.STATE_ACTIVE
|
1364
|
|
1365
|
|
1366
|
else:
|
1367
|
raise InconsistentLeaseStateError(l, doing = "starting a VM")
|
1368
|
|
1369
|
|
1370
|
|
1371
|
if rr.lease in self.future_leases:
|
1372
|
self.future_leases.remove(l)
|
1373
|
get_persistence().persist_future_leases(self.future_leases)
|
1374
|
|
1375
|
l.print_contents()
|
1376
|
self.logger.debug("LEASE-%i End of handleStartVM" % l.id)
|
1377
|
self.logger.info("Started VMs for lease %i on nodes %s" % (l.id, rr.nodes.values()))
|
1378
|
|
1379
|
|
1380
|
def _handle_end_vm(self, l, rr):
|
1381
|
""" Handles the end of a VMResourceReservation
|
1382
|
|
1383
|
Arguments:
|
1384
|
l -- Lease the VMResourceReservation belongs to
|
1385
|
rr -- THe VMResourceReservation
|
1386
|
"""
|
1387
|
self.logger.debug("LEASE-%i Start of handleEndVM" % l.id)
|
1388
|
self.logger.vdebug("LEASE-%i Before:" % l.id)
|
1389
|
l.print_contents()
|
1390
|
now_time = round_datetime(get_clock().get_time())
|
1391
|
diff = now_time - rr.start
|
1392
|
l.duration.accumulate_duration(diff)
|
1393
|
rr.state = ResourceReservation.STATE_DONE
|
1394
|
|
1395
|
self.logger.vdebug("LEASE-%i After:" % l.id)
|
1396
|
l.print_contents()
|
1397
|
self.logger.debug("LEASE-%i End of handleEndVM" % l.id)
|
1398
|
self.logger.info("Stopped VMs for lease %i on nodes %s" % (l.id, rr.nodes.values()))
|
1399
|
|
1400
|
|
1401
|
def _handle_unscheduled_end_vm(self, l, vmrr):
|
1402
|
""" Handles the unexpected end of a VMResourceReservation
|
1403
|
|
1404
|
Arguments:
|
1405
|
l -- Lease the VMResourceReservation belongs to
|
1406
|
rr -- THe VMResourceReservation
|
1407
|
"""
|
1408
|
|
1409
|
self.logger.info("LEASE-%i The VM has ended prematurely." % l.id)
|
1410
|
for rr in vmrr.post_rrs:
|
1411
|
self.slottable.remove_reservation(rr)
|
1412
|
vmrr.post_rrs = []
|
1413
|
vmrr.end = get_clock().get_time()
|
1414
|
self._handle_end_vm(l, vmrr)
|
1415
|
|
1416
|
|
1417
|
def _handle_start_suspend(self, l, rr):
|
1418
|
""" Handles the start of a SuspensionResourceReservation
|
1419
|
|
1420
|
Arguments:
|
1421
|
l -- Lease the SuspensionResourceReservation belongs to
|
1422
|
rr -- The SuspensionResourceReservation
|
1423
|
|
1424
|
"""
|
1425
|
self.logger.debug("LEASE-%i Start of handleStartSuspend" % l.id)
|
1426
|
l.print_contents()
|
1427
|
rr.state = ResourceReservation.STATE_ACTIVE
|
1428
|
|
1429
|
try:
|
1430
|
self.resourcepool.suspend_vms(l, rr)
|
1431
|
except EnactmentError, exc:
|
1432
|
self.logger.error("Enactment error when suspending VMs.")
|
1433
|
|
1434
|
|
1435
|
|
1436
|
|
1437
|
raise
|
1438
|
|
1439
|
if rr.is_first():
|
1440
|
l.set_state(Lease.STATE_SUSPENDING)
|
1441
|
l.print_contents()
|
1442
|
self.logger.info("Suspending lease %i..." % (l.id))
|
1443
|
self.logger.debug("LEASE-%i End of handleStartSuspend" % l.id)
|
1444
|
|
1445
|
|
1446
|
def _handle_end_suspend(self, l, rr):
|
1447
|
""" Handles the end of a SuspensionResourceReservation
|
1448
|
|
1449
|
Arguments:
|
1450
|
l -- Lease the SuspensionResourceReservation belongs to
|
1451
|
rr -- The SuspensionResourceReservation
|
1452
|
"""
|
1453
|
self.logger.debug("LEASE-%i Start of handleEndSuspend" % l.id)
|
1454
|
l.print_contents()
|
1455
|
|
1456
|
self.resourcepool.verify_suspend(l, rr)
|
1457
|
rr.state = ResourceReservation.STATE_DONE
|
1458
|
if rr.is_last():
|
1459
|
if l.get_type() == Lease.DEADLINE:
|
1460
|
l.set_state(Lease.STATE_SUSPENDED_PENDING)
|
1461
|
l.set_state(Lease.STATE_SUSPENDED_SCHEDULED)
|
1462
|
else:
|
1463
|
l.set_state(Lease.STATE_SUSPENDED_PENDING)
|
1464
|
l.print_contents()
|
1465
|
self.logger.debug("LEASE-%i End of handleEndSuspend" % l.id)
|
1466
|
self.logger.info("Lease %i suspended." % (l.id))
|
1467
|
|
1468
|
if l.get_state() == Lease.STATE_SUSPENDED_PENDING:
|
1469
|
raise RescheduleLeaseException
|
1470
|
|
1471
|
|
1472
|
def _handle_start_resume(self, l, rr):
|
1473
|
""" Handles the start of a ResumptionResourceReservation
|
1474
|
|
1475
|
Arguments:
|
1476
|
l -- Lease the ResumptionResourceReservation belongs to
|
1477
|
rr -- The ResumptionResourceReservation
|
1478
|
|
1479
|
"""
|
1480
|
self.logger.debug("LEASE-%i Start of handleStartResume" % l.id)
|
1481
|
l.print_contents()
|
1482
|
|
1483
|
try:
|
1484
|
self.resourcepool.resume_vms(l, rr)
|
1485
|
except EnactmentError, exc:
|
1486
|
self.logger.error("Enactment error when resuming VMs.")
|
1487
|
|
1488
|
|
1489
|
|
1490
|
|
1491
|
raise
|
1492
|
|
1493
|
rr.state = ResourceReservation.STATE_ACTIVE
|
1494
|
if rr.is_first():
|
1495
|
l.set_state(Lease.STATE_RESUMING)
|
1496
|
l.print_contents()
|
1497
|
self.logger.info("Resuming lease %i..." % (l.id))
|
1498
|
self.logger.debug("LEASE-%i End of handleStartResume" % l.id)
|
1499
|
|
1500
|
|
1501
|
def _handle_end_resume(self, l, rr):
|
1502
|
""" Handles the end of a ResumptionResourceReservation
|
1503
|
|
1504
|
Arguments:
|
1505
|
l -- Lease the ResumptionResourceReservation belongs to
|
1506
|
rr -- The ResumptionResourceReservation
|
1507
|
|
1508
|
"""
|
1509
|
self.logger.debug("LEASE-%i Start of handleEndResume" % l.id)
|
1510
|
l.print_contents()
|
1511
|
|
1512
|
self.resourcepool.verify_resume(l, rr)
|
1513
|
rr.state = ResourceReservation.STATE_DONE
|
1514
|
if rr.is_last():
|
1515
|
l.set_state(Lease.STATE_RESUMED_READY)
|
1516
|
self.logger.info("Resumed lease %i" % (l.id))
|
1517
|
for vnode, pnode in rr.vmrr.nodes.items():
|
1518
|
self.resourcepool.remove_ramfile(pnode, l, vnode)
|
1519
|
l.print_contents()
|
1520
|
self.logger.debug("LEASE-%i End of handleEndResume" % l.id)
|
1521
|
|
1522
|
|
1523
|
def _handle_start_shutdown(self, l, rr):
|
1524
|
""" Handles the start of a ShutdownResourceReservation
|
1525
|
|
1526
|
Arguments:
|
1527
|
l -- Lease the SuspensionResourceReservation belongs to
|
1528
|
rr -- The SuspensionResourceReservation
|
1529
|
"""
|
1530
|
|
1531
|
self.logger.debug("LEASE-%i Start of handleStartShutdown" % l.id)
|
1532
|
l.print_contents()
|
1533
|
rr.state = ResourceReservation.STATE_ACTIVE
|
1534
|
try:
|
1535
|
self.resourcepool.stop_vms(l, rr)
|
1536
|
except EnactmentError, exc:
|
1537
|
self.logger.error("Enactment error when shutting down VMs.")
|
1538
|
|
1539
|
|
1540
|
|
1541
|
|
1542
|
raise
|
1543
|
|
1544
|
l.print_contents()
|
1545
|
self.logger.debug("LEASE-%i End of handleStartShutdown" % l.id)
|
1546
|
|
1547
|
|
1548
|
def _handle_end_shutdown(self, l, rr):
|
1549
|
""" Handles the end of a SuspensionResourceReservation
|
1550
|
|
1551
|
Arguments:
|
1552
|
l -- Lease the SuspensionResourceReservation belongs to
|
1553
|
rr -- The SuspensionResourceReservation
|
1554
|
|
1555
|
"""
|
1556
|
self.logger.debug("LEASE-%i Start of handleEndShutdown" % l.id)
|
1557
|
l.print_contents()
|
1558
|
rr.state = ResourceReservation.STATE_DONE
|
1559
|
l.print_contents()
|
1560
|
self.logger.debug("LEASE-%i End of handleEndShutdown" % l.id)
|
1561
|
self.logger.info("Lease %i's VMs have shutdown." % (l.id))
|
1562
|
raise NormalEndLeaseException
|
1563
|
|
1564
|
|
1565
|
def _handle_start_migrate(self, l, rr):
|
1566
|
""" Handles the start of a MemImageMigrationResourceReservation
|
1567
|
|
1568
|
Arguments:
|
1569
|
l -- Lease the MemImageMigrationResourceReservation belongs to
|
1570
|
rr -- The MemImageMigrationResourceReservation
|
1571
|
|
1572
|
"""
|
1573
|
self.logger.debug("LEASE-%i Start of handleStartMigrate" % l.id)
|
1574
|
l.print_contents()
|
1575
|
rr.state = ResourceReservation.STATE_ACTIVE
|
1576
|
l.print_contents()
|
1577
|
self.logger.debug("LEASE-%i End of handleStartMigrate" % l.id)
|
1578
|
self.logger.info("Migrating lease %i..." % (l.id))
|
1579
|
|
1580
|
|
1581
|
def _handle_end_migrate(self, l, rr):
|
1582
|
""" Handles the end of a MemImageMigrationResourceReservation
|
1583
|
|
1584
|
Arguments:
|
1585
|
l -- Lease the MemImageMigrationResourceReservation belongs to
|
1586
|
rr -- The MemImageMigrationResourceReservation
|
1587
|
|
1588
|
"""
|
1589
|
self.logger.debug("LEASE-%i Start of handleEndMigrate" % l.id)
|
1590
|
l.print_contents()
|
1591
|
|
1592
|
for vnode in rr.transfers:
|
1593
|
origin = rr.transfers[vnode][0]
|
1594
|
dest = rr.transfers[vnode][1]
|
1595
|
|
1596
|
|
1597
|
self.resourcepool.remove_ramfile(origin, l, vnode)
|
1598
|
self.resourcepool.add_ramfile(dest, l, vnode, l.requested_resources[vnode].get_quantity(constants.RES_MEM))
|
1599
|
|
1600
|
rr.state = ResourceReservation.STATE_DONE
|
1601
|
l.print_contents()
|
1602
|
self.logger.debug("LEASE-%i End of handleEndMigrate" % l.id)
|
1603
|
self.logger.info("Migrated lease %i..." % (l.id))
|
1604
|
|
1605
|
|
1606
|
|
1607
|
class VMResourceReservation(ResourceReservation):
|
1608
|
def __init__(self, lease, start, end, nodes, res):
|
1609
|
ResourceReservation.__init__(self, lease, start, end, res)
|
1610
|
self.nodes = nodes
|
1611
|
self.pre_rrs = []
|
1612
|
self.post_rrs = []
|
1613
|
self.prematureend = None
|
1614
|
|
1615
|
def update_start(self, time):
|
1616
|
self.start = time
|
1617
|
|
1618
|
self.lease._update_prematureend()
|
1619
|
|
1620
|
def update_end(self, time):
|
1621
|
self.end = time
|
1622
|
|
1623
|
self.lease._update_prematureend()
|
1624
|
|
1625
|
def get_first_start(self):
|
1626
|
if len(self.pre_rrs) == 0:
|
1627
|
return self.start
|
1628
|
else:
|
1629
|
return [rr for rr in self.pre_rrs if isinstance(rr, ResumptionResourceReservation)][0].start
|
1630
|
|
1631
|
def get_final_end(self):
|
1632
|
if len(self.post_rrs) == 0:
|
1633
|
return self.end
|
1634
|
else:
|
1635
|
return self.post_rrs[-1].end
|
1636
|
|
1637
|
def is_resuming(self):
|
1638
|
return len(self.pre_rrs) > 0 and reduce(operator.or_, [isinstance(rr, ResumptionResourceReservation) for rr in self.pre_rrs])
|
1639
|
|
1640
|
def is_suspending(self):
|
1641
|
return len(self.post_rrs) > 0 and isinstance(self.post_rrs[0], SuspensionResourceReservation)
|
1642
|
|
1643
|
def is_shutting_down(self):
|
1644
|
return len(self.post_rrs) > 0 and isinstance(self.post_rrs[0], ShutdownResourceReservation)
|
1645
|
|
1646
|
def clear_rrs(self):
|
1647
|
for rr in self.pre_rrs:
|
1648
|
rr.clear_rrs()
|
1649
|
for rr in self.post_rrs:
|
1650
|
rr.clear_rrs()
|
1651
|
self.pre_rrs = None
|
1652
|
self.post_rrs = None
|
1653
|
|
1654
|
def print_contents(self, loglevel=constants.LOGLEVEL_VDEBUG):
|
1655
|
logger = logging.getLogger("LEASES")
|
1656
|
for resmrr in self.pre_rrs:
|
1657
|
resmrr.print_contents(loglevel)
|
1658
|
logger.log(loglevel, "--")
|
1659
|
logger.log(loglevel, "Type : VM")
|
1660
|
logger.log(loglevel, "Nodes : %s" % pretty_nodemap(self.nodes))
|
1661
|
if self.prematureend != None:
|
1662
|
logger.log(loglevel, "Premature end : %s" % self.prematureend)
|
1663
|
ResourceReservation.print_contents(self, loglevel)
|
1664
|
for susprr in self.post_rrs:
|
1665
|
logger.log(loglevel, "--")
|
1666
|
susprr.print_contents(loglevel)
|
1667
|
|
1668
|
|
1669
|
class SuspensionResourceReservation(ResourceReservation):
|
1670
|
def __init__(self, lease, start, end, res, vnodes, vmrr):
|
1671
|
ResourceReservation.__init__(self, lease, start, end, res)
|
1672
|
self.vmrr = vmrr
|
1673
|
self.vnodes = vnodes
|
1674
|
|
1675
|
def print_contents(self, loglevel=constants.LOGLEVEL_VDEBUG):
|
1676
|
logger = logging.getLogger("LEASES")
|
1677
|
logger.log(loglevel, "Type : SUSPEND")
|
1678
|
logger.log(loglevel, "Vnodes : %s" % self.vnodes)
|
1679
|
ResourceReservation.print_contents(self, loglevel)
|
1680
|
|
1681
|
def is_first(self):
|
1682
|
return (self == self.vmrr.post_rrs[0])
|
1683
|
|
1684
|
def is_last(self):
|
1685
|
return (self == self.vmrr.post_rrs[-1])
|
1686
|
|
1687
|
def clear_rrs(self):
|
1688
|
self.vmrr = None
|
1689
|
|
1690
|
class ResumptionResourceReservation(ResourceReservation):
|
1691
|
def __init__(self, lease, start, end, res, vnodes, vmrr):
|
1692
|
ResourceReservation.__init__(self, lease, start, end, res)
|
1693
|
self.vmrr = vmrr
|
1694
|
self.vnodes = vnodes
|
1695
|
|
1696
|
def print_contents(self, loglevel=constants.LOGLEVEL_VDEBUG):
|
1697
|
logger = logging.getLogger("LEASES")
|
1698
|
logger.log(loglevel, "Type : RESUME")
|
1699
|
logger.log(loglevel, "Vnodes : %s" % self.vnodes)
|
1700
|
ResourceReservation.print_contents(self, loglevel)
|
1701
|
|
1702
|
def is_first(self):
|
1703
|
resm_rrs = [r for r in self.vmrr.pre_rrs if isinstance(r, ResumptionResourceReservation)]
|
1704
|
return (self == resm_rrs[0])
|
1705
|
|
1706
|
def is_last(self):
|
1707
|
resm_rrs = [r for r in self.vmrr.pre_rrs if isinstance(r, ResumptionResourceReservation)]
|
1708
|
return (self == resm_rrs[-1])
|
1709
|
|
1710
|
def clear_rrs(self):
|
1711
|
self.vmrr = None
|
1712
|
|
1713
|
class ShutdownResourceReservation(ResourceReservation):
|
1714
|
def __init__(self, lease, start, end, res, vnodes, vmrr):
|
1715
|
ResourceReservation.__init__(self, lease, start, end, res)
|
1716
|
self.vmrr = vmrr
|
1717
|
self.vnodes = vnodes
|
1718
|
|
1719
|
def print_contents(self, loglevel=constants.LOGLEVEL_VDEBUG):
|
1720
|
logger = logging.getLogger("LEASES")
|
1721
|
logger.log(loglevel, "Type : SHUTDOWN")
|
1722
|
ResourceReservation.print_contents(self, loglevel)
|
1723
|
|
1724
|
def clear_rrs(self):
|
1725
|
self.vmrr = None
|
1726
|
|
1727
|
class MemImageMigrationResourceReservation(MigrationResourceReservation):
|
1728
|
def __init__(self, lease, start, end, res, vmrr, transfers):
|
1729
|
MigrationResourceReservation.__init__(self, lease, start, end, res, vmrr, transfers)
|
1730
|
|
1731
|
def print_contents(self, loglevel=constants.LOGLEVEL_VDEBUG):
|
1732
|
logger = logging.getLogger("LEASES")
|
1733
|
logger.log(loglevel, "Type : MEM IMAGE MIGRATION")
|
1734
|
logger.log(loglevel, "Transfers : %s" % self.transfers)
|
1735
|
ResourceReservation.print_contents(self, loglevel)
|