[zmq] Fix slow down

Restore use_pub_sub to default True.
Fix broker closed by mistake.

Change-Id: Ibc370d401d233059f7cbe8e7d5b15136910c8be7

oslo_messaging/_cmd/zmq_broker.py

@@ -12,7 +12,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import contextlib
 import logging
 import sys
 import time
@@ -33,8 +32,8 @@ def main():
     CONF(sys.argv[1:], project='oslo')
     logging.basicConfig(level=logging.DEBUG)
 
-    with contextlib.closing(zmq_broker.ZmqBroker(CONF)) as reactor:
-        reactor.start()
+    reactor = zmq_broker.ZmqBroker(CONF)
+    reactor.start()
 
     while True:
         time.sleep(1)

oslo_messaging/_drivers/impl_zmq.py

@@ -70,7 +70,7 @@ zmq_opts = [
                help='Expiration timeout in seconds of a name service record '
                     'about existing target ( < 0 means no timeout).'),
 
-    cfg.BoolOpt('use_pub_sub', default=False,
+    cfg.BoolOpt('use_pub_sub', default=True,
                 help='Use PUB/SUB pattern for fanout methods. '
                      'PUB/SUB always uses proxy.'),