230 lines
9.0 KiB
Python
230 lines
9.0 KiB
Python
# Copyright (c) 2011 Intel Corporation
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# Copyright (c) 2011 OpenStack, LLC.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""
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The FilterScheduler is for creating shares.
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You can customize this scheduler by specifying your own share Filters and
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Weighing Functions.
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"""
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from oslo_config import cfg
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from manila import exception
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from manila.i18n import _
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from manila.i18n import _LE
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from manila.openstack.common import log as logging
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from manila.scheduler import driver
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from manila.scheduler import scheduler_options
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CONF = cfg.CONF
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LOG = logging.getLogger(__name__)
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class FilterScheduler(driver.Scheduler):
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"""Scheduler that can be used for filtering and weighing."""
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def __init__(self, *args, **kwargs):
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super(FilterScheduler, self).__init__(*args, **kwargs)
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self.cost_function_cache = None
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self.options = scheduler_options.SchedulerOptions()
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self.max_attempts = self._max_attempts()
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def schedule(self, context, topic, method, *args, **kwargs):
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"""Return best-suited host for request."""
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self._schedule(context, topic, *args, **kwargs)
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def _get_configuration_options(self):
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"""Fetch options dictionary. Broken out for testing."""
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return self.options.get_configuration()
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def _post_select_populate_filter_properties(self, filter_properties,
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host_state):
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"""Add additional information to filter properties.
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Add additional information to the filter properties after a host has
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been selected by the scheduling process.
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"""
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# Add a retry entry for the selected volume backend:
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self._add_retry_host(filter_properties, host_state.host)
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def _add_retry_host(self, filter_properties, host):
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"""Add retry entry for the selected volume backend.
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In the event that the request gets re-scheduled, this entry
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will signal that the given backend has already been tried.
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"""
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retry = filter_properties.get('retry', None)
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if not retry:
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return
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hosts = retry['hosts']
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hosts.append(host)
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def _max_attempts(self):
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max_attempts = CONF.scheduler_max_attempts
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if max_attempts < 1:
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msg = _("Invalid value for 'scheduler_max_attempts', "
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"must be >=1")
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raise exception.InvalidParameterValue(err=msg)
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return max_attempts
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def schedule_create_share(self, context, request_spec, filter_properties):
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weighed_host = self._schedule_share(context,
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request_spec,
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filter_properties)
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if not weighed_host:
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raise exception.NoValidHost(reason="")
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host = weighed_host.obj.host
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share_id = request_spec['share_id']
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snapshot_id = request_spec['snapshot_id']
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updated_share = driver.share_update_db(context, share_id, host)
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self._post_select_populate_filter_properties(filter_properties,
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weighed_host.obj)
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# context is not serializable
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filter_properties.pop('context', None)
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self.share_rpcapi.create_share(context, updated_share, host,
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request_spec=request_spec,
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filter_properties=filter_properties,
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snapshot_id=snapshot_id)
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def _schedule_share(self, context, request_spec, filter_properties=None):
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"""Returns a list of hosts that meet the required specs.
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The list is ordered by their fitness.
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"""
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elevated = context.elevated()
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share_properties = request_spec['share_properties']
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# Since Manila is using mixed filters from Oslo and it's own, which
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# takes 'resource_XX' and 'volume_XX' as input respectively, copying
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# 'volume_XX' to 'resource_XX' will make both filters happy.
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resource_properties = share_properties.copy()
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volume_type = request_spec.get("volume_type", {})
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resource_type = request_spec.get("volume_type") or {}
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request_spec.update({'resource_properties': resource_properties})
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config_options = self._get_configuration_options()
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if filter_properties is None:
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filter_properties = {}
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self._populate_retry_share(filter_properties, resource_properties)
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filter_properties.update({'context': context,
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'request_spec': request_spec,
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'config_options': config_options,
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'volume_type': volume_type,
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'resource_type': resource_type
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})
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self.populate_filter_properties_share(request_spec, filter_properties)
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# Find our local list of acceptable hosts by filtering and
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# weighing our options. we virtually consume resources on
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# it so subsequent selections can adjust accordingly.
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# Note: remember, we are using an iterator here. So only
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# traverse this list once.
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hosts = self.host_manager.get_all_host_states_share(elevated)
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# Filter local hosts based on requirements ...
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hosts = self.host_manager.get_filtered_hosts(hosts,
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filter_properties)
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if not hosts:
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return None
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LOG.debug("Filtered share %(hosts)s", {"hosts": hosts})
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# weighted_host = WeightedHost() ... the best
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# host for the job.
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weighed_hosts = self.host_manager.get_weighed_hosts(hosts,
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filter_properties)
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best_host = weighed_hosts[0]
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LOG.debug("Choosing for share: %(best_host)s",
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{"best_host": best_host})
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# NOTE(rushiagr): updating the available space parameters at same place
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best_host.obj.consume_from_share(share_properties)
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return best_host
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def _populate_retry_share(self, filter_properties, properties):
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"""Populate filter properties with retry history.
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Populate filter properties with history of retries for this
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request. If maximum retries is exceeded, raise NoValidHost.
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"""
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max_attempts = self.max_attempts
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retry = filter_properties.pop('retry', {})
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if max_attempts == 1:
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# re-scheduling is disabled.
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return
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# retry is enabled, update attempt count:
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if retry:
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retry['num_attempts'] += 1
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else:
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retry = {
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'num_attempts': 1,
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'hosts': [] # list of share service hosts tried
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}
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filter_properties['retry'] = retry
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share_id = properties.get('share_id')
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self._log_share_error(share_id, retry)
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if retry['num_attempts'] > max_attempts:
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msg = _("Exceeded max scheduling attempts %(max_attempts)d for "
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"share %(share_id)s") % {
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"max_attempts": max_attempts,
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"share_id": share_id
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}
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raise exception.NoValidHost(reason=msg)
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def _log_share_error(self, share_id, retry):
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"""Log any exceptions from a previous share create operation.
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If the request contained an exception from a previous share
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create operation, log it to aid debugging.
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"""
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exc = retry.pop('exc', None) # string-ified exception from share
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if not exc:
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return # no exception info from a previous attempt, skip
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hosts = retry.get('hosts', None)
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if not hosts:
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return # no previously attempted hosts, skip
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last_host = hosts[-1]
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LOG.error(_LE("Error scheduling %(share_id)s from last share-service: "
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"%(last_host)s : %(exc)s"), {
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"share_id": share_id,
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"last_host": last_host,
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"exc": "exc"
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})
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def populate_filter_properties_share(self, request_spec,
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filter_properties):
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"""Stuff things into filter_properties.
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Can be overridden in a subclass to add more data.
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"""
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shr = request_spec['share_properties']
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filter_properties['size'] = shr['size']
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filter_properties['availability_zone'] = shr.get('availability_zone')
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filter_properties['user_id'] = shr.get('user_id')
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filter_properties['metadata'] = shr.get('metadata')
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