413 lines
16 KiB
Python
413 lines
16 KiB
Python
# Copyright (c) 2011 Intel Corporation
|
|
# Copyright (c) 2011 OpenStack, LLC.
|
|
# All Rights Reserved.
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License"); you may
|
|
# not use this file except in compliance with the License. You may obtain
|
|
# a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
# License for the specific language governing permissions and limitations
|
|
# under the License.
|
|
|
|
"""
|
|
The FilterScheduler is for creating shares.
|
|
You can customize this scheduler by specifying your own share Filters and
|
|
Weighing Functions.
|
|
"""
|
|
|
|
from oslo_config import cfg
|
|
from oslo_log import log
|
|
|
|
from manila import exception
|
|
from manila.i18n import _
|
|
from manila.i18n import _LE, _LI
|
|
from manila.scheduler.drivers import base
|
|
from manila.scheduler import scheduler_options
|
|
from manila.share import share_types
|
|
|
|
CONF = cfg.CONF
|
|
LOG = log.getLogger(__name__)
|
|
|
|
|
|
class FilterScheduler(base.Scheduler):
|
|
"""Scheduler that can be used for filtering and weighing."""
|
|
def __init__(self, *args, **kwargs):
|
|
super(FilterScheduler, self).__init__(*args, **kwargs)
|
|
self.cost_function_cache = None
|
|
self.options = scheduler_options.SchedulerOptions()
|
|
self.max_attempts = self._max_attempts()
|
|
|
|
def _get_configuration_options(self):
|
|
"""Fetch options dictionary. Broken out for testing."""
|
|
return self.options.get_configuration()
|
|
|
|
def get_pools(self, context, filters):
|
|
return self.host_manager.get_pools(context, filters)
|
|
|
|
def _post_select_populate_filter_properties(self, filter_properties,
|
|
host_state):
|
|
"""Add additional information to filter properties.
|
|
|
|
Add additional information to the filter properties after a host has
|
|
been selected by the scheduling process.
|
|
"""
|
|
# Add a retry entry for the selected volume backend:
|
|
self._add_retry_host(filter_properties, host_state.host)
|
|
|
|
def _add_retry_host(self, filter_properties, host):
|
|
"""Add retry entry for the selected volume backend.
|
|
|
|
In the event that the request gets re-scheduled, this entry
|
|
will signal that the given backend has already been tried.
|
|
"""
|
|
retry = filter_properties.get('retry', None)
|
|
if not retry:
|
|
return
|
|
hosts = retry['hosts']
|
|
hosts.append(host)
|
|
|
|
def _max_attempts(self):
|
|
max_attempts = CONF.scheduler_max_attempts
|
|
if max_attempts < 1:
|
|
msg = _("Invalid value for 'scheduler_max_attempts', "
|
|
"must be >=1")
|
|
raise exception.InvalidParameterValue(err=msg)
|
|
return max_attempts
|
|
|
|
def schedule_create_share(self, context, request_spec, filter_properties):
|
|
weighed_host = self._schedule_share(context,
|
|
request_spec,
|
|
filter_properties)
|
|
|
|
if not weighed_host:
|
|
raise exception.NoValidHost(reason="")
|
|
|
|
host = weighed_host.obj.host
|
|
share_id = request_spec['share_id']
|
|
snapshot_id = request_spec['snapshot_id']
|
|
|
|
updated_share = base.share_update_db(context, share_id, host)
|
|
self._post_select_populate_filter_properties(filter_properties,
|
|
weighed_host.obj)
|
|
|
|
# context is not serializable
|
|
filter_properties.pop('context', None)
|
|
|
|
self.share_rpcapi.create_share_instance(
|
|
context, updated_share.instance, host,
|
|
request_spec=request_spec,
|
|
filter_properties=filter_properties,
|
|
snapshot_id=snapshot_id
|
|
)
|
|
|
|
def _format_filter_properties(self, context, filter_properties,
|
|
request_spec):
|
|
|
|
elevated = context.elevated()
|
|
|
|
share_properties = request_spec['share_properties']
|
|
# Since Manila is using mixed filters from Oslo and it's own, which
|
|
# takes 'resource_XX' and 'volume_XX' as input respectively, copying
|
|
# 'volume_XX' to 'resource_XX' will make both filters happy.
|
|
resource_properties = share_properties.copy()
|
|
share_type = request_spec.get("share_type", {})
|
|
if not share_type:
|
|
msg = _("You must create a share type in advance,"
|
|
" and specify in request body or"
|
|
" set default_share_type in manila.conf.")
|
|
LOG.error(msg)
|
|
raise exception.InvalidParameterValue(err=msg)
|
|
|
|
extra_specs = share_type.get('extra_specs', {})
|
|
|
|
if extra_specs:
|
|
for extra_spec_name in share_types.get_boolean_extra_specs():
|
|
extra_spec = extra_specs.get(extra_spec_name)
|
|
|
|
if extra_spec is not None:
|
|
if not extra_spec.startswith("<is>"):
|
|
extra_spec = "<is> %s" % extra_spec
|
|
share_type['extra_specs'][extra_spec_name] = extra_spec
|
|
|
|
resource_type = request_spec.get("share_type") or {}
|
|
request_spec.update({'resource_properties': resource_properties})
|
|
|
|
config_options = self._get_configuration_options()
|
|
|
|
# NOTE(ameade): If a consistency group is specified, pass the
|
|
# consistency group support level to the ConsistencyGroupFilter
|
|
# (host, pool, or False)
|
|
cg_support = None
|
|
cg = request_spec.get('consistency_group')
|
|
if cg:
|
|
temp_hosts = self.host_manager.get_all_host_states_share(elevated)
|
|
cg_host = next((host for host in temp_hosts
|
|
if host.host == cg.get('host')), None)
|
|
if cg_host:
|
|
cg_support = cg_host.consistency_group_support
|
|
|
|
if filter_properties is None:
|
|
filter_properties = {}
|
|
self._populate_retry_share(filter_properties, resource_properties)
|
|
|
|
filter_properties.update({'context': context,
|
|
'request_spec': request_spec,
|
|
'config_options': config_options,
|
|
'share_type': share_type,
|
|
'resource_type': resource_type,
|
|
'cg_support': cg_support,
|
|
'consistency_group': cg,
|
|
})
|
|
|
|
self.populate_filter_properties_share(request_spec, filter_properties)
|
|
|
|
return filter_properties, share_properties
|
|
|
|
def _schedule_share(self, context, request_spec, filter_properties=None):
|
|
"""Returns a list of hosts that meet the required specs.
|
|
|
|
The list is ordered by their fitness.
|
|
"""
|
|
elevated = context.elevated()
|
|
|
|
filter_properties, share_properties = self._format_filter_properties(
|
|
context, filter_properties, request_spec)
|
|
|
|
# Find our local list of acceptable hosts by filtering and
|
|
# weighing our options. we virtually consume resources on
|
|
# it so subsequent selections can adjust accordingly.
|
|
|
|
# Note: remember, we are using an iterator here. So only
|
|
# traverse this list once.
|
|
hosts = self.host_manager.get_all_host_states_share(elevated)
|
|
|
|
# Filter local hosts based on requirements ...
|
|
hosts = self.host_manager.get_filtered_hosts(hosts,
|
|
filter_properties)
|
|
if not hosts:
|
|
return None
|
|
|
|
LOG.debug("Filtered share %(hosts)s", {"hosts": hosts})
|
|
# weighted_host = WeightedHost() ... the best
|
|
# host for the job.
|
|
weighed_hosts = self.host_manager.get_weighed_hosts(hosts,
|
|
filter_properties)
|
|
best_host = weighed_hosts[0]
|
|
LOG.debug("Choosing for share: %(best_host)s",
|
|
{"best_host": best_host})
|
|
# NOTE(rushiagr): updating the available space parameters at same place
|
|
best_host.obj.consume_from_share(share_properties)
|
|
return best_host
|
|
|
|
def _populate_retry_share(self, filter_properties, properties):
|
|
"""Populate filter properties with retry history.
|
|
|
|
Populate filter properties with history of retries for this
|
|
request. If maximum retries is exceeded, raise NoValidHost.
|
|
"""
|
|
max_attempts = self.max_attempts
|
|
retry = filter_properties.pop('retry', {})
|
|
|
|
if max_attempts == 1:
|
|
# re-scheduling is disabled.
|
|
return
|
|
|
|
# retry is enabled, update attempt count:
|
|
if retry:
|
|
retry['num_attempts'] += 1
|
|
else:
|
|
retry = {
|
|
'num_attempts': 1,
|
|
'hosts': [] # list of share service hosts tried
|
|
}
|
|
filter_properties['retry'] = retry
|
|
|
|
share_id = properties.get('share_id')
|
|
self._log_share_error(share_id, retry)
|
|
|
|
if retry['num_attempts'] > max_attempts:
|
|
msg = _("Exceeded max scheduling attempts %(max_attempts)d for "
|
|
"share %(share_id)s") % {
|
|
"max_attempts": max_attempts,
|
|
"share_id": share_id
|
|
}
|
|
raise exception.NoValidHost(reason=msg)
|
|
|
|
def _log_share_error(self, share_id, retry):
|
|
"""Log any exceptions from a previous share create operation.
|
|
|
|
If the request contained an exception from a previous share
|
|
create operation, log it to aid debugging.
|
|
"""
|
|
exc = retry.pop('exc', None) # string-ified exception from share
|
|
if not exc:
|
|
return # no exception info from a previous attempt, skip
|
|
|
|
hosts = retry.get('hosts', None)
|
|
if not hosts:
|
|
return # no previously attempted hosts, skip
|
|
|
|
last_host = hosts[-1]
|
|
LOG.error(_LE("Error scheduling %(share_id)s from last share-service: "
|
|
"%(last_host)s : %(exc)s"), {
|
|
"share_id": share_id,
|
|
"last_host": last_host,
|
|
"exc": "exc"
|
|
})
|
|
|
|
def populate_filter_properties_share(self, request_spec,
|
|
filter_properties):
|
|
"""Stuff things into filter_properties.
|
|
|
|
Can be overridden in a subclass to add more data.
|
|
"""
|
|
shr = request_spec['share_properties']
|
|
inst = request_spec['share_instance_properties']
|
|
filter_properties['size'] = shr['size']
|
|
filter_properties['availability_zone_id'] = (
|
|
inst.get('availability_zone_id')
|
|
)
|
|
filter_properties['user_id'] = shr.get('user_id')
|
|
filter_properties['metadata'] = shr.get('metadata')
|
|
|
|
def schedule_create_consistency_group(self, context, group_id,
|
|
request_spec,
|
|
filter_properties):
|
|
|
|
LOG.info(_LI("Scheduling consistency group %s") % group_id)
|
|
|
|
host = self._get_best_host_for_consistency_group(
|
|
context,
|
|
request_spec)
|
|
|
|
if not host:
|
|
msg = _("No hosts available for consistency group %s") % group_id
|
|
raise exception.NoValidHost(reason=msg)
|
|
|
|
msg = _LI("Chose host %(host)s for create_consistency_group %(cg_id)s")
|
|
LOG.info(msg % {'host': host, 'cg_id': group_id})
|
|
|
|
updated_group = base.cg_update_db(context, group_id, host)
|
|
|
|
self.share_rpcapi.create_consistency_group(context,
|
|
updated_group, host)
|
|
|
|
def _get_weighted_hosts_for_share_type(self, context, request_spec,
|
|
share_type):
|
|
config_options = self._get_configuration_options()
|
|
# NOTE(ameade): Find our local list of acceptable hosts by
|
|
# filtering and weighing our options. We virtually consume
|
|
# resources on it so subsequent selections can adjust accordingly.
|
|
|
|
# NOTE(ameade): Remember, we are using an iterator here. So only
|
|
# traverse this list once.
|
|
all_hosts = self.host_manager.get_all_host_states_share(context)
|
|
|
|
if not all_hosts:
|
|
return []
|
|
|
|
share_type['extra_specs'] = share_type.get('extra_specs', {})
|
|
|
|
if share_type['extra_specs']:
|
|
for spec_name in share_types.get_undeletable_extra_specs():
|
|
extra_spec = share_type['extra_specs'].get(spec_name)
|
|
|
|
if extra_spec is not None:
|
|
share_type['extra_specs'][spec_name] = (
|
|
"<is> %s" % extra_spec)
|
|
# Only allow pools that support consistency groups
|
|
share_type['extra_specs']['consistency_group_support'] = (
|
|
"<or> host <or> pool")
|
|
|
|
filter_properties = {
|
|
'context': context,
|
|
'request_spec': request_spec,
|
|
'config_options': config_options,
|
|
'share_type': share_type,
|
|
'resource_type': share_type,
|
|
'size': 0,
|
|
}
|
|
# Filter local hosts based on requirements ...
|
|
hosts = self.host_manager.get_filtered_hosts(all_hosts,
|
|
filter_properties)
|
|
|
|
if not hosts:
|
|
return []
|
|
|
|
LOG.debug("Filtered %s" % hosts)
|
|
|
|
# weighted_host = WeightedHost() ... the best host for the job.
|
|
weighed_hosts = self.host_manager.get_weighed_hosts(
|
|
hosts,
|
|
filter_properties)
|
|
if not weighed_hosts:
|
|
return []
|
|
|
|
return weighed_hosts
|
|
|
|
def _get_weighted_candidates_cg(self, context, request_spec):
|
|
"""Finds hosts that support the consistency group.
|
|
|
|
Returns a list of hosts that meet the required specs,
|
|
ordered by their fitness.
|
|
"""
|
|
elevated = context.elevated()
|
|
|
|
shr_types = request_spec.get("share_types", None)
|
|
|
|
weighed_hosts = []
|
|
|
|
for iteration_count, share_type in enumerate(shr_types):
|
|
temp_weighed_hosts = self._get_weighted_hosts_for_share_type(
|
|
elevated, request_spec, share_type)
|
|
|
|
# NOTE(ameade): Take the intersection of hosts so we have one that
|
|
# can support all share types of the CG
|
|
if iteration_count == 0:
|
|
weighed_hosts = temp_weighed_hosts
|
|
else:
|
|
new_weighed_hosts = []
|
|
for host1 in weighed_hosts:
|
|
for host2 in temp_weighed_hosts:
|
|
if host1.obj.host == host2.obj.host:
|
|
new_weighed_hosts.append(host1)
|
|
weighed_hosts = new_weighed_hosts
|
|
if not weighed_hosts:
|
|
return []
|
|
|
|
return weighed_hosts
|
|
|
|
def _get_best_host_for_consistency_group(self, context, request_spec):
|
|
weighed_hosts = self._get_weighted_candidates_cg(
|
|
context,
|
|
request_spec)
|
|
|
|
if not weighed_hosts:
|
|
return None
|
|
return weighed_hosts[0].obj.host
|
|
|
|
def host_passes_filters(self, context, host, request_spec,
|
|
filter_properties):
|
|
|
|
elevated = context.elevated()
|
|
|
|
filter_properties, share_properties = self._format_filter_properties(
|
|
context, filter_properties, request_spec)
|
|
|
|
hosts = self.host_manager.get_all_host_states_share(elevated)
|
|
hosts = self.host_manager.get_filtered_hosts(hosts, filter_properties)
|
|
hosts = self.host_manager.get_weighed_hosts(hosts, filter_properties)
|
|
|
|
for tgt_host in hosts:
|
|
if tgt_host.obj.host == host:
|
|
return tgt_host.obj
|
|
|
|
msg = (_('Cannot place share %(id)s on %(host)s')
|
|
% {'id': request_spec['share_id'], 'host': host})
|
|
raise exception.NoValidHost(reason=msg)
|