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[Dongcan Ye <hellochosen@xxxxxxxxx>]

Public bug reported:

When I set api_workers > 0 in Neutron configuration, delelting or adding router interface, Neutron L3 agent can't receive message from Neutron Server. 
In this situation, L3 agent report state can cast to Neutron Server, meanwhile it can receive cast message from Neutron Server.(use call method)

Obviously, Neutron Server can use cast method for sending message to L3
agent, But why cast routers_updated fails? This also occurs in other
Neutron agent.

Then I make a test, write some codes in  Neutron server starts or
l3_router_plugins, sends cast periodic message to L3 agent directly.
>From L3 agent rpc-zmq-receiver log file shows it receives message from
Neutron Server.

By the way, all things well when api_workers = 0.

Test environment:
neutron(master) + oslo.messaging(master) + zeromq

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1364814

Title:
  Neutron multiple api workers can't send cast message to agent when use
  zeromq

Status in OpenStack Neutron (virtual network service):
  New

Bug description:
  When I set api_workers > 0 in Neutron configuration, delelting or adding router interface, Neutron L3 agent can't receive message from Neutron Server. 
  In this situation, L3 agent report state can cast to Neutron Server, meanwhile it can receive cast message from Neutron Server.(use call method)

  Obviously, Neutron Server can use cast method for sending message to
  L3 agent, But why cast routers_updated fails? This also occurs in
  other Neutron agent.

  Then I make a test, write some codes in  Neutron server starts or
  l3_router_plugins, sends cast periodic message to L3 agent directly.
  From L3 agent rpc-zmq-receiver log file shows it receives message from
  Neutron Server.

  By the way, all things well when api_workers = 0.

  Test environment:
  neutron(master) + oslo.messaging(master) + zeromq

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