2e4b807131
existing code will create queues from the cartesian product of the
set of pipelines and the set of agents. these queues are identified
by pipe_type-pipe_name-agent_id. the problem arises where if an agent
dies, any messages left on it's queue will be lost as agent_id's tend
to be unique.
this patch changes the logic so rather than using the number of agents
as the set we build our cartesian product from, we use a set of numbers
of a configurable size. by default, it will be a set of 10 so that queues
are created from the product set of the set of pipelines and the set
{0, 1, 2, 3, ... 9}. similarly, the pipelines queues will be identified
by pipe_type-pipe_name-x, where x is value from numerical set. this
way, if an agent dies, the queues are still known and can be
redistributed and processed among the active agents.
Change-Id: I35e3afdd2c9f97ab5bc6bb89531bd20308c5f8c0
Closes-Bug: #1486754
290 lines
12 KiB
Python
290 lines
12 KiB
Python
#
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# Copyright 2012-2013 eNovance <licensing@enovance.com>
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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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from oslo_config import cfg
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from oslo_context import context
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from oslo_log import log
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import oslo_messaging
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from stevedore import extension
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from ceilometer.agent import plugin_base as base
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from ceilometer import coordination
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from ceilometer.event import endpoint as event_endpoint
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from ceilometer.i18n import _, _LI, _LW
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from ceilometer import exchange_control
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from ceilometer import messaging
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from ceilometer import pipeline
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from ceilometer import service_base
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from ceilometer import utils
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LOG = log.getLogger(__name__)
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OPTS = [
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cfg.IntOpt('pipeline_processing_queues',
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default=10,
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min=1,
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help='Number of queues to parallelize workload across. This '
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'value should be larger than the number of active '
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'notification agents for optimal results.'),
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cfg.BoolOpt('ack_on_event_error',
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default=True,
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deprecated_group='collector',
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help='Acknowledge message when event persistence fails.'),
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cfg.BoolOpt('store_events',
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deprecated_group='collector',
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default=False,
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help='Save event details.'),
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cfg.BoolOpt('disable_non_metric_meters',
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default=True,
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help='WARNING: Ceilometer historically offered the ability to '
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'store events as meters. This usage is NOT advised as it '
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'can flood the metering database and cause performance '
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'degradation.'),
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cfg.BoolOpt('workload_partitioning',
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default=False,
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help='Enable workload partitioning, allowing multiple '
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'notification agents to be run simultaneously.'),
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cfg.MultiStrOpt('messaging_urls',
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default=[],
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secret=True,
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help="Messaging URLs to listen for notifications. "
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"Example: transport://user:pass@host1:port"
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"[,hostN:portN]/virtual_host "
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"(DEFAULT/transport_url is used if empty)"),
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]
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cfg.CONF.register_opts(exchange_control.EXCHANGE_OPTS)
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cfg.CONF.register_opts(OPTS, group="notification")
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cfg.CONF.import_opt('telemetry_driver', 'ceilometer.publisher.messaging',
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group='publisher_notifier')
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class NotificationService(service_base.BaseService):
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"""Notification service.
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When running multiple agents, additional queuing sequence is required for
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inter process communication. Each agent has two listeners: one to listen
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to the main OpenStack queue and another listener(and notifier) for IPC to
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divide pipeline sink endpoints. Coordination should be enabled to have
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proper active/active HA.
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"""
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NOTIFICATION_NAMESPACE = 'ceilometer.notification'
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NOTIFICATION_IPC = 'ceilometer-pipe'
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def __init__(self, *args, **kwargs):
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super(NotificationService, self).__init__(*args, **kwargs)
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self.partition_coordinator = None
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self.listeners, self.pipeline_listeners = [], []
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self.group_id = None
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@classmethod
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def _get_notifications_manager(cls, pm):
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return extension.ExtensionManager(
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namespace=cls.NOTIFICATION_NAMESPACE,
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invoke_on_load=True,
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invoke_args=(pm, )
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)
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def _get_notifiers(self, transport, pipe):
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notifiers = []
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for x in range(cfg.CONF.notification.pipeline_processing_queues):
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notifiers.append(oslo_messaging.Notifier(
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transport,
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driver=cfg.CONF.publisher_notifier.telemetry_driver,
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publisher_id='ceilometer.notification',
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topic='%s-%s-%s' % (self.NOTIFICATION_IPC, pipe.name, x)))
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return notifiers
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def _get_pipe_manager(self, transport, pipeline_manager):
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if cfg.CONF.notification.workload_partitioning:
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pipe_manager = pipeline.SamplePipelineTransportManager()
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for pipe in pipeline_manager.pipelines:
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key = pipeline.get_pipeline_grouping_key(pipe)
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pipe_manager.add_transporter(
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(pipe.source.support_meter, key or ['resource_id'],
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self._get_notifiers(transport, pipe)))
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else:
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pipe_manager = pipeline_manager
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return pipe_manager
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def _get_event_pipeline_manager(self, transport):
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if cfg.CONF.notification.store_events:
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self.event_pipeline_manager = pipeline.setup_event_pipeline()
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if cfg.CONF.notification.workload_partitioning:
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event_pipe_manager = pipeline.EventPipelineTransportManager()
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for pipe in self.event_pipeline_manager.pipelines:
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event_pipe_manager.add_transporter(
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(pipe.source.support_event, ['event_type'],
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self._get_notifiers(transport, pipe)))
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else:
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event_pipe_manager = self.event_pipeline_manager
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return event_pipe_manager
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def start(self):
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super(NotificationService, self).start()
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self.pipeline_manager = pipeline.setup_pipeline()
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self.transport = messaging.get_transport()
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if cfg.CONF.notification.workload_partitioning:
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self.ctxt = context.get_admin_context()
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self.group_id = self.NOTIFICATION_NAMESPACE
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self.partition_coordinator = coordination.PartitionCoordinator()
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self.partition_coordinator.start()
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self.partition_coordinator.join_group(self.group_id)
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else:
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# FIXME(sileht): endpoint uses the notification_topics option
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# and it should not because this is an oslo_messaging option
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# not a ceilometer. Until we have something to get the
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# notification_topics in another way, we must create a transport
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# to ensure the option has been registered by oslo_messaging.
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messaging.get_notifier(self.transport, '')
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self.group_id = None
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self.pipe_manager = self._get_pipe_manager(self.transport,
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self.pipeline_manager)
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self.event_pipe_manager = self._get_event_pipeline_manager(
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self.transport)
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self.listeners, self.pipeline_listeners = [], []
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self._configure_main_queue_listeners(self.pipe_manager,
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self.event_pipe_manager)
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if cfg.CONF.notification.workload_partitioning:
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self._configure_pipeline_listeners()
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self.partition_coordinator.watch_group(self.group_id,
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self._refresh_agent)
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self.tg.add_timer(cfg.CONF.coordination.heartbeat,
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self.partition_coordinator.heartbeat)
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self.tg.add_timer(cfg.CONF.coordination.check_watchers,
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self.partition_coordinator.run_watchers)
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if not cfg.CONF.notification.disable_non_metric_meters:
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LOG.warning(_LW('Non-metric meters may be collected. It is highly '
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'advisable to disable these meters using '
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'ceilometer.conf or the pipeline.yaml'))
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# Add a dummy thread to have wait() working
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self.tg.add_timer(604800, lambda: None)
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self.init_pipeline_refresh()
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def _configure_main_queue_listeners(self, pipe_manager,
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event_pipe_manager):
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notification_manager = self._get_notifications_manager(pipe_manager)
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if not list(notification_manager):
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LOG.warning(_('Failed to load any notification handlers for %s'),
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self.NOTIFICATION_NAMESPACE)
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ack_on_error = cfg.CONF.notification.ack_on_event_error
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endpoints = []
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if cfg.CONF.notification.store_events:
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endpoints.append(
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event_endpoint.EventsNotificationEndpoint(event_pipe_manager))
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targets = []
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for ext in notification_manager:
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handler = ext.obj
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if (cfg.CONF.notification.disable_non_metric_meters and
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isinstance(handler, base.NonMetricNotificationBase)):
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continue
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LOG.debug('Event types from %(name)s: %(type)s'
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' (ack_on_error=%(error)s)',
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{'name': ext.name,
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'type': ', '.join(handler.event_types),
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'error': ack_on_error})
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# NOTE(gordc): this could be a set check but oslo_messaging issue
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# https://bugs.launchpad.net/oslo.messaging/+bug/1398511
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# This ensures we don't create multiple duplicate consumers.
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for new_tar in handler.get_targets(cfg.CONF):
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if new_tar not in targets:
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targets.append(new_tar)
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endpoints.append(handler)
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urls = cfg.CONF.notification.messaging_urls or [None]
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for url in urls:
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transport = messaging.get_transport(url)
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listener = messaging.get_notification_listener(
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transport, targets, endpoints)
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listener.start()
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self.listeners.append(listener)
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def _refresh_agent(self, event):
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self.reload_pipeline()
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def _refresh_listeners(self):
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utils.kill_listeners(self.pipeline_listeners)
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self._configure_pipeline_listeners()
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def _configure_pipeline_listeners(self):
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self.pipeline_listeners = []
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ev_pipes = []
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if cfg.CONF.notification.store_events:
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ev_pipes = self.event_pipeline_manager.pipelines
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pipelines = self.pipeline_manager.pipelines + ev_pipes
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transport = messaging.get_transport()
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partitioned = self.partition_coordinator.extract_my_subset(
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self.group_id,
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range(cfg.CONF.notification.pipeline_processing_queues))
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for pipe_set in partitioned:
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for pipe in pipelines:
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LOG.debug('Pipeline endpoint: %s from set: %s', pipe.name,
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pipe_set)
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pipe_endpoint = (pipeline.EventPipelineEndpoint
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if isinstance(pipe, pipeline.EventPipeline)
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else pipeline.SamplePipelineEndpoint)
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listener = messaging.get_notification_listener(
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transport,
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[oslo_messaging.Target(
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topic='%s-%s-%s' % (self.NOTIFICATION_IPC,
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pipe.name, pipe_set))],
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[pipe_endpoint(self.ctxt, pipe)])
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listener.start()
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self.pipeline_listeners.append(listener)
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def stop(self):
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if self.partition_coordinator:
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self.partition_coordinator.stop()
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utils.kill_listeners(self.listeners + self.pipeline_listeners)
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super(NotificationService, self).stop()
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def reload_pipeline(self):
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LOG.info(_LI("Reloading notification agent and listeners."))
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self.pipe_manager = self._get_pipe_manager(
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self.transport, self.pipeline_manager)
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self.event_pipe_manager = self._get_event_pipeline_manager(
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self.transport)
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# re-start the main queue listeners.
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utils.kill_listeners(self.listeners)
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self._configure_main_queue_listeners(
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self.pipe_manager, self.event_pipe_manager)
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# re-start the pipeline listeners if workload partitioning
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# is enabled.
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if cfg.CONF.notification.workload_partitioning:
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self._refresh_listeners()
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