openstack/kuryr-kubernetes
Code Issues Proposed changes

gracefully exit daemonserver before registry exit

Browse Source 
If the registry manager is stopped while daemon server is still
processing requests, the pending requests fail and result in resource
leaks in ovs.

With this change, we wait for DaemonServer to finish processing before
shutting down the registry manager.

Closes-bug: 1856109
Change-Id: I37498ae7bf6a8b4b14afe53d1af3fb8823d589cf
Signed-off-by: Yash Gupta <y.gupta@samsung.com>
Co-Authored-By: Michał Dulko <mdulko@redhat.com>
This commit is contained in:
Yash Gupta 2019-12-11 15:29:15 +09:00 committed by Michał Dulko
parent 1b6eb50d83
commit 0c0ade435e
1 changed files with 28 additions and 3 deletions
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29
kuryr_kubernetes/cni/daemon/service.py
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@ -28,6 +28,7 @@ import cotyledon
import flask
import pyroute2
from pyroute2.ipdb import transactional
from werkzeug import serving
import os_vif
from oslo_concurrency import lockutils
@ -68,6 +69,7 @@ class DaemonServer(object):
'/delNetwork', methods=['POST'], view_func=self.delete)
self.headers = {'ContentType': 'application/json',
'Connection': 'close'}
self._server = None
def _prepare_request(self):
params = cni_utils.CNIParameters(flask.request.get_json())
@ -184,12 +186,21 @@ class DaemonServer(object):
raise
try:
self.application.run(address, port, threaded=False,
self._server = serving.make_server(
address, port, self.application, threaded=False,
processes=CONF.cni_daemon.worker_num)
self._server.serve_forever()
except Exception:
LOG.exception('Failed to start kuryr-daemon.')
raise
def stop(self):
LOG.info("Waiting for DaemonServer worker processes to exit...")
self._server._block_on_close = True
self._server.shutdown()
self._server.server_close()
LOG.info("All DaemonServer workers finished gracefully.")
def _check_failure(self):
with self.failure_count.get_lock():
if self.failure_count.value < CONF.cni_daemon.cni_failures_count:
@ -221,6 +232,9 @@ class CNIDaemonServerService(cotyledon.Service):
# Run HTTP server
self.server.run()
def terminate(self):
self.server.stop()
class CNIDaemonWatcherService(cotyledon.Service):
name = "watcher"
@ -328,6 +342,8 @@ class CNIDaemonHealthServerService(cotyledon.Service):
class CNIDaemonServiceManager(cotyledon.ServiceManager):
def __init__(self):
# NOTE(mdulko): Default shutdown timeout is 60 seconds and K8s won't
# wait more by default anyway.
super(CNIDaemonServiceManager, self).__init__()
# TODO(dulek): Use cotyledon.oslo_config_glue to support conf reload.
@ -344,7 +360,8 @@ class CNIDaemonServiceManager(cotyledon.ServiceManager):
registry = self.manager.dict() # For Watcher->Server communication.
healthy = multiprocessing.Value(c_bool, True)
self.add(CNIDaemonWatcherService, workers=1, args=(registry, healthy,))
self.add(CNIDaemonServerService, workers=1, args=(registry, healthy,))
self._server_service = self.add(
CNIDaemonServerService, workers=1, args=(registry, healthy))
self.add(CNIDaemonHealthServerService, workers=1, args=(healthy,))
self.register_hooks(on_terminate=self.terminate)
@ -379,7 +396,15 @@ class CNIDaemonServiceManager(cotyledon.ServiceManager):
def terminate(self):
self._terminate_called.set()
LOG.info("Gracefully stopping DaemonServer service..")
self.reconfigure(self._server_service, 0)
for worker in self._running_services[self._server_service]:
worker.terminate()
for worker in self._running_services[self._server_service]:
worker.join()
LOG.info("Stopping registry manager...")
self.manager.shutdown()
LOG.info("Continuing with shutdown")
def start():