dhcp_agent fails in RPC communication with neutron-server under Metaplugin

[Itsuro Oda]

This problem occurs when ml2 plugin runs under Metaplugin.

error log of dhcp_agent is as follows:
---
2014-03-28 18:57:17.062 ERROR neutron.agent.dhcp_agent [req-9c53d7a6-d850-42de-896f-184827b33bfd None None] Failed reporting state!
2014-03-28 18:57:17.062 TRACE neutron.agent.dhcp_agent Traceback (most recent call last):
2014-03-28 18:57:17.062 TRACE neutron.agent.dhcp_agent File "/opt/stack/neutron/neutron/agent/dhcp_agent.py", line 564, in _report_state
2014-03-28 18:57:17.062 TRACE neutron.agent.dhcp_agent self.state_rpc.report_state(ctx, self.agent_state, self.use_call)
2014-03-28 18:57:17.062 TRACE neutron.agent.dhcp_agent File "/opt/stack/neutron/neutron/agent/rpc.py", line 72, in report_state
2014-03-28 18:57:17.062 TRACE neutron.agent.dhcp_agent return self.call(context, msg, topic=self.topic)
2014-03-28 18:57:17.062 TRACE neutron.agent.dhcp_agent File "/opt/stack/neutron/neutron/openstack/common/rpc/proxy.py", line 129, in call
2014-03-28 18:57:17.062 TRACE neutron.agent.dhcp_agent exc.info, real_topic, msg.get('method'))
2014-03-28 18:57:17.062 TRACE neutron.agent.dhcp_agent Timeout: Timeout while waiting on RPC response - topic: "q-plugin", RPC method: "report_state" info: "<unknown>"
2014-03-28 18:57:17.062 TRACE neutron.agent.dhcp_agent
---

This problem is brought by the patch:
 https://review.openstack.org/#/c/72565/
because ml2 plguin does not become to open RPC connection at plugin initialization.

[Itsuro Oda (oda-g)]

I will submit the fix in a few days.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/84914

[Openstack Gerrit (openstack-gerrit)]

Reviewed: https://review.openstack.org/84914
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=8fb023ed53aff31f37ebebb94aca4f8e2a188342
Submitter: Jenkins
Branch: master

commit 8fb023ed53aff31f37ebebb94aca4f8e2a188342
Author: Itsuro Oda <email address hidden>
Date: Wed Apr 2 13:24:42 2014 +0900

    Add support for multiple RPC workers under Metaplugin

    Metaplugin needs a fix to support multiple RPC workers properly
    because a plugin which supports multiple RPC workers cannot
    initialize RPC connections at plugin initialization.

    Closes-Bug: #1300570
    Change-Id: I584f70abb8969054cd4edc8f914d00f6be930bab

[Openstack Gerrit (openstack-gerrit)]

Fix proposed to branch: stable/icehouse
Review: https://review.openstack.org/90011

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/90011
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=5db494d5457c4102113fe43a7741cddcf4bca85a
Submitter: Jenkins
Branch: stable/icehouse

commit 5db494d5457c4102113fe43a7741cddcf4bca85a
Author: Itsuro Oda <email address hidden>
Date: Wed Apr 2 13:24:42 2014 +0900

    Add support for multiple RPC workers under Metaplugin

    Metaplugin needs a fix to support multiple RPC workers properly
    because a plugin which supports multiple RPC workers cannot
    initialize RPC connections at plugin initialization.

    Closes-Bug: #1300570
    Change-Id: I584f70abb8969054cd4edc8f914d00f6be930bab
    (cherry picked from commit 8fb023ed53aff31f37ebebb94aca4f8e2a188342)