Still not feasible
[root@host224 home(keystone_admin)]# vi /etc/nova/nova.conf
.....
[oslo_messaging_zmq]
rpc_zmq_matchmaker=redis
use_pub_sub=false
use_router_proxy=false
use_dynamic_connections=true
zmq_linger=60
.......

When restart nova-conductor, nova-compute send CALL message to conductor, socket.send() function has still been blocked:
2017-02-09 09:14:32.954 8054 DEBUG oslo_messaging._drivers.zmq_driver.client.zmq_routing_table [-] Processing target ROUTER/conductor for round-robin. _fetch_round_robin_hosts_from_matchmaker /usr/lib/python2.7/site-packages/oslo_messaging/_drivers/zmq_driver/client/zmq_routing_table.py:59
2017-02-09 09:14:32.955 8054 DEBUG oslo_messaging._drivers.zmq_driver.client.zmq_routing_table [-] Host resolved for the current connection is host224:52880 get_round_robin_host /usr/lib/python2.7/site-packages/oslo_messaging/_drivers/zmq_driver/client/zmq_routing_table.py:48
2017-02-09 09:14:32.955 8054 DEBUG oslo_messaging._drivers.zmq_driver.zmq_socket [-] Connecting DEALER socket f33e3904-739c-4a7b-90a0-71637a669e1e to tcp://host224:52880 connect_to_address /usr/lib/python2.7/site-packages/oslo_messaging/_drivers/zmq_driver/zmq_socket.py:188
2017-02-09 09:14:32.955 8054 DEBUG oslo_messaging._drivers.zmq_driver.client.zmq_routing_table [-] Processing target ROUTER/conductor for round-robin. _fetch_round_robin_hosts_from_matchmaker /usr/lib/python2.7/site-packages/oslo_messaging/_drivers/zmq_driver/client/zmq_routing_table.py:59
2017-02-09 09:14:32.955 8054 DEBUG oslo_messaging._drivers.zmq_driver.zmq_socket [-] Connecting DEALER socket f33e3904-739c-4a7b-90a0-71637a669e1e to tcp://host224:55407 connect_to_address /usr/lib/python2.7/site-packages/oslo_messaging/_drivers/zmq_driver/zmq_socket.py:188
2017-02-09 09:14:32.956 8054 DEBUG oslo_messaging._drivers.zmq_driver.zmq_socket [-] Connecting DEALER socket f33e3904-739c-4a7b-90a0-71637a669e1e to tcp://host224:57659 connect_to_address /usr/lib/python2.7/site-packages/oslo_messaging/_drivers/zmq_driver/zmq_socket.py:188
2017-02-09 09:16:47.391 8054 DEBUG oslo_messaging._drivers.zmq_driver.client.zmq_routing_table [-] Updating routing table from the matchmaker. 2 target(s) updated ['ROUTER/scheduler', 'ROUTER/conductor']. _update_routing_table /usr/lib/python2.7/site-packages/oslo_messaging/_drivers/zmq_driver/client/zmq_routing_table.py:194
2017-02-09 09:19:47.394 8054 DEBUG oslo_messaging._drivers.zmq_driver.client.zmq_routing_table [-] Updating routing table from the matchmaker. 2 target(s) updated ['ROUTER/scheduler', 'ROUTER/conductor']. _update_routing_table /usr/lib/python2.7/site-packages/oslo_messaging/_drivers/zmq_driver/client/zmq_routing_table.py:194
2017-02-09 09:22:47.397 8054 DEBUG oslo_messaging._drivers.zmq_driver.client.zmq_routing_table [-] Updating routing table from the matchmaker. 2 target(s) updated ['ROUTER/scheduler', 'ROUTER/conductor']. _update_routing_table /usr/lib/python2.7/site-packages/oslo_messaging/_drivers/zmq_driver/client/zmq_routing_table.py:194
2017-02-09 09:25:47.400 8054 DEBUG oslo_messaging._drivers.zmq_driver.client.zmq_routing_table [-] Updating routing table from the matchmaker. 2 target(s) updated ['ROUTER/scheduler', 'ROUTER/conductor']. _update_routing_table /usr/lib/python2.7/site-packages/oslo_messaging/_drivers/zmq_driver/client/zmq_routing_table.py:194
2017-02-09 09:28:47.404 8054 DEBUG oslo_messaging._drivers.zmq_driver.client.zmq_routing_table [-] Updating routing table from the matchmaker. 2 target(s) updated ['ROUTER/scheduler', 'ROUTER/conductor']. _update_routing_table /usr/lib/python2.7/site-packages/oslo_messaging/_drivers/zmq_driver/client/zmq_routing_table.py:194
2017-02-09 09:31:47.406 8054 DEBUG oslo_messaging._drivers.zmq_driver.client.zmq_routing_table [-] Updating routing table from the matchmaker. 2 target(s) updated ['ROUTER/scheduler', 'ROUTER/conductor']. _update_routing_table /usr/lib/python2.7/site-packages/oslo_messaging/_drivers/zmq_driver/client/zmq_routing_table.py:194
2017-02-09 09:34:47.411 8054 DEBUG oslo_messaging._drivers.zmq_driver.client.zmq_routing_table [-] Updating routing table from the matchmaker. 2 target(s) updated ['ROUTER/scheduler', 'ROUTER/conductor']. _update_routing_table /usr/lib/python2.7/site-packages/oslo_messaging/_drivers/zmq_driver/client/zmq_routing_table.py:194
2017-02-09 09:37:47.414 8054 DEBUG oslo_messaging._drivers.zmq_driver.client.zmq_routing_table [-] Updating routing table from the matchmaker. 2 target(s) updated ['ROUTER/scheduler', 'ROUTER/conductor']. _update_routing_table /usr/lib/python2.7/site-packages/oslo_messaging/_drivers/zmq_driver/client/zmq_routing_table.py:194
2017-02-09 09:40:47.417 8054 DEBUG oslo_messaging._drivers.zmq_driver.client.zmq_routing_table [-] Updating routing table from the matchmaker. 2 target(s) updated ['ROUTER/scheduler', 'ROUTER/conductor']. _update_routing_table /usr/lib/python2.7/site-packages/oslo_messaging/_drivers/zmq_driver/client/zmq_routing_table.py:194
2017-02-09 09:43:47.420 8054 DEBUG oslo_messaging._drivers.zmq_driver.client.zmq_routing_table [-] Updating routing table from the matchmaker. 2 target(s) updated ['ROUTER/scheduler', 'ROUTER/conductor']. _update_routing_table /usr/lib/python2.7/site-packages/oslo_messaging/_drivers/zmq_driver/client/zmq_routing_table.py:194
2017-02-09 09:46:47.423 8054 DEBUG oslo_messaging._drivers.zmq_driver.client.zmq_routing_table [-] Updating routing table from the matchmaker. 2 target(s) updated ['ROUTER/scheduler', 'ROUTER/conductor']. _update_routing_table /usr/lib/python2.7/site-packages/oslo_messaging/_drivers/zmq_driver/client/zmq_routing_table.py:194
2017-02-09 09:49:47.493 8054 DEBUG oslo_messaging._drivers.zmq_driver.client.zmq_routing_table [-] Updating routing table from the matchmaker. 2 target(s) updated ['ROUTER/scheduler', 'ROUTER/conductor']. _update_routing_table /usr/lib/python2.7/site-packages/oslo_messaging/_drivers/zmq_driver/client/zmq_routing_table.py:194
2017-02-09 09:52:47.496 8054 DEBUG oslo_messaging._drivers.zmq_driver.client.zmq_routing_table [-] Updating routing table from the matchmaker. 2 target(s) updated ['ROUTER/scheduler', 'ROUTER/conductor']. _update_routing_table /usr/lib/python2.7/site-packages/oslo_messaging/_drivers/zmq_driver/client/zmq_routing_table.py:194
2017-02-09 09:52:52.805 8054 DEBUG oslo_messaging._drivers.zmq_driver.client.zmq_senders [-] Sending CALL message 1d267196-ee65-11e6-ad44-fa163e6b3caa to target <Target topic=conductor, version=3.0> (v1.0) send /usr/lib/python2.7/site-packages/oslo_messaging/_drivers/zmq_driver/client/zmq_senders.py:155
2017-02-09 09:52:52.806 8054 DEBUG oslo_messaging._drivers.zmq_driver.poller.green_poller [-] Registering socket f33e3904-739c-4a7b-90a0-71637a669e1e register /usr/lib/python2.7/site-packages/oslo_messaging/_drivers/zmq_driver/poller/green_poller.py:32
2017-02-09 09:52:52.807 8054 ERROR oslo_messaging._drivers.zmq_driver.client.zmq_receivers [-] Receiving message failed: AssertionError('Response expected!',)
2017-02-09 09:53:52.807 8054 DEBUG oslo_messaging._drivers.zmq_driver.poller.green_poller [-] Unregistering socket f33e3904-739c-4a7b-90a0-71637a669e1e unregister /usr/lib/python2.7/site-packages/oslo_messaging/_drivers/zmq_driver/poller/green_poller.py:40
2017-02-09 09:53:52.808 8054 DEBUG oslo_messaging._drivers.zmq_driver.zmq_socket [-] Socket f33e3904-739c-4a7b-90a0-71637a669e1e closed close /usr/lib/python2.7/site-packages/oslo_messaging/_drivers/zmq_driver/zmq_socket.py:179
2017-02-09 09:53:52.810 8054 ERROR oslo_service.periodic_task [req-ffd6af46-c1b7-4cdf-8102-6c423a06876b - - - - -] Error during ComputeManager._sync_scheduler_instance_info
2017-02-09 09:53:52.810 8054 ERROR oslo_service.periodic_task Traceback (most recent call last):
2017-02-09 09:53:52.810 8054 ERROR oslo_service.periodic_task   File "/usr/lib/python2.7/site-packages/oslo_service/periodic_task.py", line 220, in run_periodic_tasks
2017-02-09 09:53:52.810 8054 ERROR oslo_service.periodic_task     task(self, context)
2017-02-09 09:53:52.810 8054 ERROR oslo_service.periodic_task   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 1814, in _sync_scheduler_instance_info
2017-02-09 09:53:52.810 8054 ERROR oslo_service.periodic_task     use_slave=True)
2017-02-09 09:53:52.810 8054 ERROR oslo_service.periodic_task   File "/usr/lib/python2.7/site-packages/oslo_versionedobjects/base.py", line 174, in wrapper
2017-02-09 09:53:52.810 8054 ERROR oslo_service.periodic_task     args, kwargs)
2017-02-09 09:53:52.810 8054 ERROR oslo_service.periodic_task   File "/usr/lib/python2.7/site-packages/nova/conductor/rpcapi.py", line 240, in object_class_action_versions
2017-02-09 09:53:52.810 8054 ERROR oslo_service.periodic_task     args=args, kwargs=kwargs)
2017-02-09 09:53:52.810 8054 ERROR oslo_service.periodic_task   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/client.py", line 169, in call
2017-02-09 09:53:52.810 8054 ERROR oslo_service.periodic_task     retry=self.retry)
2017-02-09 09:53:52.810 8054 ERROR oslo_service.periodic_task   File "/usr/lib/python2.7/site-packages/oslo_messaging/transport.py", line 97, in _send
2017-02-09 09:53:52.810 8054 ERROR oslo_service.periodic_task     timeout=timeout, retry=retry)
2017-02-09 09:53:52.810 8054 ERROR oslo_service.periodic_task   File "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/impl_zmq.py", line 161, in send
2017-02-09 09:53:52.810 8054 ERROR oslo_service.periodic_task     return client.send_call(target, ctxt, message, timeout, retry)
2017-02-09 09:53:52.810 8054 ERROR oslo_service.periodic_task   File "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/zmq_driver/client/zmq_client_base.py", line 52, in send_call
2017-02-09 09:53:52.810 8054 ERROR oslo_service.periodic_task     return self.call_publisher.send_call(request)
2017-02-09 09:53:52.810 8054 ERROR oslo_service.periodic_task   File "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/zmq_driver/client/zmq_publisher_manager.py", line 51, in _target_not_found_timeout
2017-02-09 09:53:52.810 8054 ERROR oslo_service.periodic_task     return func(self, request, *args, **kwargs)
2017-02-09 09:53:52.810 8054 ERROR oslo_service.periodic_task   File "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/zmq_driver/client/zmq_publisher_manager.py", line 127, in send_call
2017-02-09 09:53:52.810 8054 ERROR oslo_service.periodic_task     reply = self.publisher.receive_reply(socket, request)
2017-02-09 09:53:52.810 8054 ERROR oslo_service.periodic_task   File "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/zmq_driver/client/publishers/dealer/zmq_dealer_publisher_base.py", line 58, in receive_reply
2017-02-09 09:53:52.810 8054 ERROR oslo_service.periodic_task     self._raise_timeout(request)
2017-02-09 09:53:52.810 8054 ERROR oslo_service.periodic_task   File "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/zmq_driver/client/publishers/zmq_publisher_base.py", line 87, in _raise_timeout
2017-02-09 09:53:52.810 8054 ERROR oslo_service.periodic_task     {"tout": request.timeout, "msg_id": request.message_id})
2017-02-09 09:53:52.810 8054 ERROR oslo_service.periodic_task MessagingTimeout: Timeout 60 seconds was reached for message 281035d8-ee65-11e6-ad44-fa163e6b3caa
2017-02-09 09:53:52.810 8054 ERROR oslo_service.periodic_task 

send_request() has been blocked,the following procedure cannot be performed,even more unable to execute socket.close(),
zmq_linger option in nova.conf can not play a role.
class PublisherManagerDynamic(PublisherManagerBase):

    @target_not_found_timeout
    def send_call(self, request):
        with contextlib.closing(self.publisher.acquire_connection(request)) \
                as socket:
            self.publisher.send_request(socket, request)
            reply = self.publisher.receive_reply(socket, request)
            return reply