[rabbitmq-discuss] Understanding Federation

[MELIQUE Denis (MORPHO)]

I'm doing some testing with federation plug-in to try to understand it.

I have set a little test bed with 2 brokers. One (2.7.1) running on Windows XP, the other (2.6.1) running on RedHat 6.
I have set some producer and consumers, which seem to work fine.

But I'd like to get some explanation about Exchanges and Queues that I see in the RabbitMQ Management.

I Have one federated exchange declared on both brokers.

Here is my rabbit.config file for the windows side, on linux it's the same except connection and host:
[
{rabbitmq_federation,
    [ {exchanges, [[{exchange,     "federation.forward"},
                    {virtual_host, "/"},
                    {type,         "topic"},
                    {durable,      true},
                    {auto_delete,  false},
                    {internal,     false},
                    {upstream_set, "common-upstream"}]
                  ]},
      {upstream_sets, [{"common-upstream", [[{connection, "linux-host"},
                                          {max_hops,   1}]
                                        ]}
                      ]},
      {connections, [{"linux-host", [{host,            "linux-host"},
                                          {protocol,        "amqp"},
                                          {port,            5672},
                                          {virtual_host,    "/"},
                                          {username,        "guest"},
                                          {password,        "guest"},
                                          {mechanism,       default},
                                          {prefetch_count,  1000},
                                          {reconnect_delay, 5},
                                          {heartbeat,       1},
                                          {queue_expires,   30000},
                                          {message_ttl,     10000}
                                         ]}
                    ]},
      {local_username, "guest"},
      {local_nodename, "win-host"}
    ]
}
].


When I start the brokers, I can see additional exchanges and Queues on  both part.
But they are not the symmetric.
On the Windows side :
                Additional Exchanges
                               federation.forward, x-federation (OK for this one that's what I excpected)
federation: federation.forward -> linux-host B , fanaout, D, AD, I

And additional Queue:
federation: federation.forward -> linux-host, TTL,D

On the Linux Side:
                Additional Exchanges
federation.forward, x-federation (OK for this one that's what I excpected)
federation: federation.forward -> win-host B, fanout, D, AD,I
And additional Queue:
federation: federation.forward -> win-host, TTL,D


What are these Exchange and Queues used for ?
Are they reserved for federation internal use ?
When do messages go into these queues ?
Do they have to be durable or is there a way to configure them as transient ?

I would be very interested by  a brief description of how federation works internally.

Thank you
Cheers
Denis

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