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https://opendev.org/openstack/ironic.git
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bbf57b1c2a
This change removes eventlet usage and explicitly invokes threading instead of eventlet. To do this, it also revises signal handling because this change also moves from an all in one process to a multi-process runtime model. The side effect of this is an increased memory footprint, depending on the process launch model. Change-Id: I184245d67edb1a2543aa24654836392f38777d71 Signed-off-by: Julia Kreger <juliaashleykreger@gmail.com>
60 lines
2.1 KiB
Python
60 lines
2.1 KiB
Python
# 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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import os
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import signal
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from oslo_config import cfg
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from oslo_log import log
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from ironic.conductor import rpc_service
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LOG = log.getLogger(__name__)
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CONF = cfg.CONF
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# NOTE(TheJulia): These methods are for the parent processes to
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# glue behavior expectations to conductor shutdowns.
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def handle_no_deregister(signo, frame):
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LOG.info('Got signal SIGUSR1. Not deregistering on next shutdown '
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'on host %(host)s.',
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{'host': CONF.host})
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rpc_service.DEREGISTER_ON_SHUTDOWN.clear()
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def handle_drain(signo, frame):
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LOG.info('Got signal SIGUSR2. Initiating a workload drain and '
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'shutdown on host %(host)s.',
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{'host': CONF.host})
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rpc_service.DRAIN.set()
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# NOTE(TheJulia): This is sort of aggressive, but it works.
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# Issue in part is we need to trigger the child process to stop, and
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# the manager shutdown method is for parent process calls, in other words
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# the application triggering a self shutdown. Utlimately this triggers the
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# application stop() method to be called.
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os.kill(0, signal.SIGTERM)
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def handle_signal():
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"""Add a signal handler for SIGUSR1, SIGUSR2.
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The SIGUSR1 handler ensures that the manager is not deregistered when
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it is shutdown.
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The SIGUSR2 handler starts a drain shutdown.
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"""
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signal.signal(signal.SIGUSR1, handle_no_deregister)
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# In ironic, USR2 triggers a draining shutdown, we'll need to figure out
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# how to do that in this model, most likely set a flag and request the
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# manager to shutdown.
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signal.signal(signal.SIGUSR2, handle_drain)
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