Request mechanism rolled out, migration mechanism is also incorporated
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0c1e9328e8
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726839f4c6
2 changed files with 171 additions and 122 deletions
117
helper.py
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117
helper.py
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@ -0,0 +1,117 @@
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from collections import Counter
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from functools import reduce
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from ucloud_common.vm import VmPool, VMStatus
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from ucloud_common.host import HostPool, HostStatus
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from ucloud_common.request import RequestEntry, RequestPool, RequestType
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from etcd3_wrapper import Etcd3Wrapper
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from decouple import config
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client = Etcd3Wrapper(
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host=config("ETCD_HOST"), port=int(config("ETCD_PORT"))
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)
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vm_pool = VmPool(client, config("VM_PREFIX"))
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host_pool = HostPool(client, config("HOST_PREFIX"))
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request_pool = RequestPool(client, config("REQUEST_PREFIX"))
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def accumulated_specs(vms_specs):
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if not vms_specs:
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return {}
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return reduce((lambda x, y: Counter(x) + Counter(y)), vms_specs)
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def remaining_resources(host_specs, vms_specs):
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"""Return remaining resources host_specs - vms"""
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vms_specs = Counter(vms_specs)
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remaining = Counter(host_specs)
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remaining.subtract(vms_specs)
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return remaining
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def get_suitable_host(vm_specs, hosts=None):
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if hosts is None:
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hosts = host_pool.by_status(HostStatus.alive)
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for host in hosts:
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# Filter them by host_name
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vms = vm_pool.by_host(host.key)
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# Filter them by status
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vms = vm_pool.except_status(VMStatus.requested_new, vms)
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running_vms_specs = [vm.specs for vm in vms]
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# Accumulate all of their combined specs
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running_vms_accumulated_specs = accumulated_specs(
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running_vms_specs
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)
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# Find out remaining resources after
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# host_specs - already running vm_specs
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remaining = remaining_resources(
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host.specs, running_vms_accumulated_specs
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)
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# Find out remaining - new_vm_specs
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remaining = remaining_resources(remaining, vm_specs)
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# if remaining resources >= 0 return this host_name
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if all(
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map(
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lambda x: True if remaining[x] >= 0 else False,
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remaining,
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)
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):
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return host.key
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return None
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def dead_host_detection():
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# Bring out your dead! - Monty Python and the Holy Grail
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hosts = host_pool.by_status(HostStatus.alive)
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dead_hosts_keys = []
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for host in hosts:
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# Only check those who claims to be alive
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if host.status == HostStatus.alive:
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if not host.is_alive():
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dead_hosts_keys.append(host.key)
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return dead_hosts_keys
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def dead_host_mitigation(dead_hosts_keys):
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for host_key in dead_hosts_keys:
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host = host_pool.get(host_key)
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host.declare_dead()
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vms_hosted_on_dead_host = vm_pool.by_host(host_key)
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for vm in vms_hosted_on_dead_host:
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vm.declare_killed()
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vm_pool.put(vm)
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host_pool.put(host)
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def assign_host(vm):
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host_name = get_suitable_host(vm.specs)
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if host_name:
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# if vm.status == VMStatus.requested_new:
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# vm.status = VMStatus.scheduled_deploy
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#
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# if vm.status == VMStatus.killed:
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# vm.status = VMStatus.requested_start
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vm.hostname = host_name
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vm_pool.put(vm)
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r = RequestEntry.from_scratch(type=RequestType.StartVM,
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uuid=vm.uuid,
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hostname=vm.hostname)
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request_pool.put(r)
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vm.log.append("VM scheduled for starting")
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return host_name
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return None
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176
main.py
176
main.py
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@ -8,12 +8,14 @@ import argparse
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import logging
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from decouple import config
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from collections import Counter
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from functools import reduce
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from etcd3_wrapper import Etcd3Wrapper
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from ucloud_common.vm import VmPool, VMEntry, VMStatus
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from ucloud_common.host import HostPool, HostStatus
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from ucloud_common.vm import VmPool
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from ucloud_common.host import HostPool
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from ucloud_common.request import RequestEntry, RequestPool, RequestType
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from helper import (get_suitable_host, dead_host_mitigation, dead_host_detection,
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assign_host)
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logging.basicConfig(
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level=logging.DEBUG,
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@ -23,143 +25,70 @@ logging.basicConfig(
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datefmt="%d-%b-%y %H:%M:%S",
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)
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VM_POOL = None
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HOST_POOL = None
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def accumulated_specs(vms_specs):
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if not vms_specs:
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return {}
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return reduce((lambda x, y: Counter(x) + Counter(y)), vms_specs)
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def remaining_resources(host_specs, vms_specs):
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"""Return remaining resources host_specs - vms"""
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vms_specs = Counter(vms_specs)
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remaining = Counter(host_specs)
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remaining.subtract(vms_specs)
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return remaining
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def get_suitable_host(vm_specs):
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hosts = HOST_POOL.by_status(HostStatus.alive)
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for host in hosts:
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# Filter them by host_name
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vms = VM_POOL.by_host(host.key)
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# Filter them by status
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vms = VM_POOL.except_status(VMStatus.requested_new, vms)
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running_vms_specs = [vm.specs for vm in vms]
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# Accumulate all of their combined specs
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running_vms_accumulated_specs = accumulated_specs(
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running_vms_specs
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)
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# Find out remaining resources after
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# host_specs - already running vm_specs
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remaining = remaining_resources(
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host.specs, running_vms_accumulated_specs
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)
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# Find out remaining - new_vm_specs
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remaining = remaining_resources(remaining, vm_specs)
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# if remaining resources >= 0 return this host_name
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if all(
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map(
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lambda x: True if remaining[x] >= 0 else False,
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remaining,
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)
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):
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return host.key
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return None
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def dead_host_detection():
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# Bring out your dead! - Monty Python and the Holy Grail
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hosts = HOST_POOL.by_status(HostStatus.alive)
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dead_hosts_keys = []
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for host in hosts:
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# Only check those who claims to be alive
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if host.status == HostStatus.alive:
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if not host.is_alive():
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dead_hosts_keys.append(host.key)
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return dead_hosts_keys
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def dead_host_mitigation(dead_hosts_keys):
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for host_key in dead_hosts_keys:
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host = HOST_POOL.get(host_key)
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host.declare_dead()
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vms_hosted_on_dead_host = VM_POOL.by_host(host_key)
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for vm in vms_hosted_on_dead_host:
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vm.declare_killed()
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VM_POOL.put(vm)
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HOST_POOL.put(host)
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def assign_host(vm):
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host_name = get_suitable_host(vm.specs)
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if host_name:
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if vm.status == VMStatus.requested_new:
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vm.status = VMStatus.scheduled_deploy
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if vm.status == VMStatus.killed:
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vm.status = VMStatus.requested_start
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vm.hostname = host_name
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VM_POOL.put(vm)
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return host_name
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return None
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def main(vm_prefix, host_prefix):
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def main(vm_prefix, host_prefix, request_prefix):
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logging.info(f"{'*' * 5} SESSION STARTED {'*' * 5}")
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client = Etcd3Wrapper(
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host=config("ETCD_HOST"), port=int(config("ETCD_PORT"))
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)
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global VM_POOL, HOST_POOL
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VM_POOL = VmPool(client, vm_prefix)
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HOST_POOL = HostPool(client, host_prefix)
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vm_pool = VmPool(client, vm_prefix)
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host_pool = HostPool(client, host_prefix)
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request_pool = RequestPool(client, request_prefix)
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PENDING_VMS = []
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for events_iterator in [
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client.get_prefix(vm_prefix, value_in_json=True),
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client.watch_prefix(vm_prefix, timeout=5, value_in_json=True),
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client.get_prefix(request_prefix, value_in_json=True),
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client.watch_prefix(request_prefix, timeout=5, value_in_json=True),
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]:
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for e in events_iterator:
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e = VMEntry(e)
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if not e.value:
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continue
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e = RequestEntry(e)
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logging.debug(f"{e.key}, {e.value}")
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# Never Run time critical mechanism inside timeout
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# mechanism because timeout mechanism only comes
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# when no other event is happening. It means under
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# heavy load there would not be a timeout
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if e.status == "TIMEOUT":
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# heavy load there would not be a timeout<
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if e.type == "TIMEOUT":
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logging.debug("TIMEOUT event occured")
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dead_hosts = dead_host_detection()
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logging.debug(f"Dead hosts: {dead_hosts}")
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dead_host_mitigation(dead_hosts)
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#
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# vm_scheduled = []
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# for vm in PENDING_VMS:
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# if assign_host(vm) is not None:
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# vm_scheduled.append(vm)
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#
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# for vm in vm_scheduled:
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# PENDING_VMS.remove(vm)
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# logging.debug(f"Remaining Pending: {PENDING_VMS}")
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vm_scheduled = []
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for vm in PENDING_VMS:
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if assign_host(vm) is not None:
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vm_scheduled.append(vm)
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elif e.type == RequestType.ScheduleVM:
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if hasattr(e, "migration") and e.migration and\
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hasattr(e, "destination") and e.destination:
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client.client.delete(e.key)
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vm = vm_pool.get(e.uuid)
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host = get_suitable_host(vm.specs, [host_pool.get(e.destination)])
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if host:
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r = RequestEntry.from_scratch(type=RequestType.InitVMMigration,
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uuid=e.uuid, destination=e.destination)
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request_pool.put(r)
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print(host, e)
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else:
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logging.info("Requested destination host doesn't have enough capacity"
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f"to hold {vm.uuid}")
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else:
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client.client.delete(e.key)
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vm = vm_pool.get(e.uuid)
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if assign_host(vm) is None:
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vm.log.append("Can't schedule VM. No Resource Left.")
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vm_pool.put(vm)
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for vm in vm_scheduled:
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PENDING_VMS.remove(vm)
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logging.debug(f"Remaining Pending: {PENDING_VMS}")
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elif e.status in [VMStatus.requested_new, VMStatus.killed]:
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if assign_host(e) is None:
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PENDING_VMS.append(e)
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logging.info("No Resource Left. Emailing admin....")
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logging.debug(f"Pending VMS: {PENDING_VMS}")
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PENDING_VMS.append(vm)
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logging.info("No Resource Left. Emailing admin....")
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logging.debug(f"Pending VMS: {PENDING_VMS}")
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if __name__ == "__main__":
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@ -170,6 +99,9 @@ if __name__ == "__main__":
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argparser.add_argument(
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"--host_prefix", required=False, default=config("HOST_PREFIX")
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)
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argparser.add_argument(
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"--request_prefix", required=False, default=config("REQUEST_PREFIX")
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)
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args = argparser.parse_args()
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main(args.vm_prefix, args.host_prefix)
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main(args.vm_prefix, args.host_prefix, args.request_prefix)
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