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+=========================================================
+ZeroMQ Context should be created once per driver instance
+=========================================================
+
+https://blueprints.launchpad.net/oslo.messaging/+spec/zmq-context-per-driver-instance
+
+ZeroMQ context object has singleton nature, so producing it
+more than once per driver is inefficient consuming of resources.
+
+Now it is created per socket.
+
+Proposed change
+===============
+
+oslo-messaging
+--------------
+
+Move creation of zmq context from ZmqSocket constructor
+:meth:`ZmqSocket.__init__`
+
+::
+
+   # oslo_messaging/_drivers/impl_zmq.py
+
+   class ZmqSocket(object):
+
+      def __init__(self, addr, zmq_type, bind=True, subscribe=None):
+         self.ctxt = zmq.Context(CONF.rpc_zmq_contexts)
+         self.sock = self.ctxt.socket(zmq_type)
+
+
+to ZmqDriver constructor :meth:`ZmqDriver.__init__`
+
+::
+
+   # oslo_messaging/_drivers/impl_zmq.py
+
+   class ZmqDriver(base.BaseDriver):
+
+       def __init__(self, conf, url, default_exchange=None,
+                    allowed_remote_exmods=None):
+       self.ctxt = zmq.Context(CONF.rpc_zmq_contexts)
+
+Update :meth:`ZmqSocket.__init__` to pass zmq context as an argument
+
+::
+
+   # oslo_messaging/_drivers/impl_zmq.py
+
+   class ZmqSocket(object):
+      ...
+      def __init__(self, zmq_ctx, addr, zmq_type, bind=True, subscribe=None):
+         self.ctxt = zmq_ctx
+         self.sock = self.ctxt.socket(zmq_type)
+
+
+Alternatives
+------------
+
+None
+
+Impact on Existing APIs
+-----------------------
+
+None
+
+Security impact
+---------------
+
+None
+
+Performance Impact
+------------------
+
+None
+
+Configuration Impact
+--------------------
+
+None
+
+Developer Impact
+----------------
+
+None
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Primary assignee:
+  Oleksii Zamiatin (ozamiatin@mirantis.com)
+
+Other contributors:
+  None
+
+Milestones
+----------
+
+next-kilo
+
+Work Items
+----------
+
+1. Perform the code movements
+2. Update all places in impl_zmq where socket used
+
+
+Incubation
+==========
+
+N/A
+
+Adoption
+--------
+
+N/A
+
+Library
+-------
+
+oslo.messaging
+
+Documentation Impact
+====================
+
+N/A
+
+Dependencies
+============
+
+None
+
+References
+==========
+
+.. note::
+
+   Check neutron https://bugs.launchpad.net/neutron/+bug/1364814