[zmq] Dynamic connections failover
ZeroMQ manages failover automatically when socket is being connected to multiple hosts. Dynamic connections mode assumes to connect once per message so we connect only to a single host. However we cannot say for sure if this host is still alive. For failover reasons we can connect to a primary host and then add some more hosts as failover and let ZeroMQ to decide where it finally sends the message. Change-Id: I19cbb75aaea8a0b725dd6a8ff665392738e164a1
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oslo_messaging/_drivers/zmq_driver
@ -66,6 +66,10 @@ class DealerPublisherDirect(zmq_dealer_publisher_base.DealerPublisherBase):
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def _get_round_robin_host_connection(self, target, socket):
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host = self.routing_table.get_round_robin_host(target)
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socket.connect_to_host(host)
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failover_hosts = self.routing_table.get_all_round_robin_hosts(target)
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upper_bound = self.conf.oslo_messaging_zmq.zmq_failover_connections
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for host in failover_hosts[:upper_bound]:
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socket.connect_to_host(host)
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def _get_fanout_connection(self, target, socket):
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for host in self.routing_table.get_fanout_hosts(target):
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@ -105,7 +105,9 @@ class DealerPublisherProxyDynamic(
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if not self.publishers:
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raise zmq_matchmaker_base.MatchmakerUnavailable()
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socket = self.sockets_manager.get_socket()
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socket.connect_to_host(random.choice(tuple(self.publishers)))
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random.shuffle(self.publishers)
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for publisher in self.publishers:
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socket.connect_to_host(publisher)
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return socket
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def send_request(self, socket, request):
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@ -97,6 +97,11 @@ zmq_opts = [
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'means to use direct connections for direct message '
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'types (ignored otherwise).'),
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cfg.IntOpt('zmq_failover_connections', default=2,
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help='How many additional connections to a host will be made '
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'for failover reasons. This option is actual only in '
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'dynamic connections mode.'),
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cfg.PortOpt('rpc_zmq_min_port',
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default=49153,
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deprecated_group='DEFAULT',
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