openstack/neutron
Code Issues Proposed changes

Do not start conntrack worker thread from __init__

Browse Source 
Instead, start it when the first entry is being added to
the queue.  Also, log any exceptions just in case get()
throws something so we can do further debugging.

Changed class from Queue to LightQueue was done after going
through the eventlet.queue code looking at usage, since
it's a little smaller and should be faster.

Change-Id: Ie84be88382f327ebe312bf17ec2dc5c80a8de35f
Closes-bug: 1750777
This commit is contained in:
Brian Haley 2018-03-01 15:42:59 +00:00
parent 20760bcdf5
commit 4c8b97eca3
1 changed files with 17 additions and 6 deletions
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23
neutron/agent/linux/ip_conntrack.py
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@ -17,7 +17,6 @@ import eventlet
import netaddr import netaddr
from oslo_concurrency import lockutils from oslo_concurrency import lockutils
from oslo_log import log as logging from oslo_log import log as logging
from six.moves import queue as Queue
from neutron.agent.linux import utils as linux_utils from neutron.agent.linux import utils as linux_utils
from neutron.common import constants as n_const from neutron.common import constants as n_const
@ -44,7 +43,7 @@ class IpConntrackUpdate(object):
class IpConntrackProcessingQueue(object): class IpConntrackProcessingQueue(object):
"""Manager of the queue of conntrack updates to process.""" """Manager of the queue of conntrack updates to process."""
def __init__(self): def __init__(self):
self._queue = Queue.Queue() self._queue = eventlet.queue.LightQueue()
def add(self, update): def add(self, update):
self._queue.put(update) self._queue.put(update)
@ -52,8 +51,15 @@ class IpConntrackProcessingQueue(object):
def updates(self): def updates(self):
"""Grabs the next conntrack update from the queue and processes.""" """Grabs the next conntrack update from the queue and processes."""
while not self._queue.empty(): while not self._queue.empty():
update = self._queue.get() try:
yield update update = self._queue.get()
yield update
except IndexError:
# queue was empty, another worker stole our entry
continue
except Exception as e:
LOG.error("Failed to yield ip_conntrack process queue "
"entry: %s", e)
@lockutils.synchronized('conntrack') @lockutils.synchronized('conntrack')
@ -83,9 +89,11 @@ class IpConntrackManager(object):
self.zone_per_port = zone_per_port # zone per port vs per network self.zone_per_port = zone_per_port # zone per port vs per network
self._populate_initial_zone_map() self._populate_initial_zone_map()
self._queue = IpConntrackProcessingQueue() self._queue = IpConntrackProcessingQueue()
self.start_process_queue() # Don't start the queue processing thread here, do later when
# the first entry is added to the queue.
self._process_queue_started = False
def start_process_queue(self): def _start_process_queue(self):
eventlet.spawn_n(self._process_queue_loop) eventlet.spawn_n(self._process_queue_loop)
def _process_queue_loop(self): def _process_queue_loop(self):
@ -105,6 +113,9 @@ class IpConntrackManager(object):
update.rule) update.rule)
def _process(self, device_info_list, rule, remote_ips=None): def _process(self, device_info_list, rule, remote_ips=None):
if not self._process_queue_started:
self._process_queue_started = True
self._start_process_queue()
# queue the update to allow the caller to resume its work # queue the update to allow the caller to resume its work
update = IpConntrackUpdate(device_info_list, rule, remote_ips) update = IpConntrackUpdate(device_info_list, rule, remote_ips)
self._queue.add(update) self._queue.add(update)