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<p class=MsoNormal><span lang=EN-US>I’m doing some testing with
federation plug-in to try to understand it.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>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.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>I have set some producer and consumers,
which seem to work fine.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>But I’d like to get some explanation about
Exchanges and Queues that I see in the RabbitMQ Management.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>I Have one federated exchange declared on
both brokers.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Here is my rabbit.config file for the
windows side, on linux it’s the same except connection and host:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>[<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>{rabbitmq_federation,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> [ {exchanges,
[[{exchange, "federation.forward"},<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
{virtual_host, "/"},<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
{type, "topic"},<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
{durable, true},<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
{auto_delete, false},<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
{internal, false},<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
{upstream_set, "common-upstream"}]<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
]},<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
{upstream_sets, [{"common-upstream", [[{connection,
"linux-host"},<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
{max_hops, 1}]<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
]}<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
]},<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
{connections, [{"linux-host",
[{host,
"linux-host"},<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
{protocol, "amqp"},<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
{port, 5672},<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
{virtual_host,
"/"},<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
{username, "guest"},<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
{password, "guest"},<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
{mechanism, default},<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
{prefetch_count, 1000},<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
{reconnect_delay, 5},<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
{heartbeat, 1},<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
{queue_expires, 30000},<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
{message_ttl, 10000}<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
]}<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
]},<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
{local_username, "guest"},<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> {local_nodename,
"win-host"}<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> ]<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>}<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>].<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>When I start the brokers, I can see additional
exchanges and Queues on both part.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>But they are not the symmetric.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>On the Windows side : <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> Additional
Exchanges<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> federation.forward,
x-federation (OK for this one that’s what I excpected)<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:70.8pt'><span lang=EN-US>federation:
federation.forward -> linux-host B , fanaout, D, AD, I<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal style='text-indent:35.4pt'><span lang=EN-US>And additional
Queue:<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:70.8pt'><span lang=EN-US>federation:
federation.forward -> linux-host, TTL,D<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>On the Linux Side:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> Additional
Exchanges<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:35.4pt;text-indent:35.4pt'><span
lang=EN-US>federation.forward, x-federation (OK for this one that’s what
I excpected)<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:35.4pt;text-indent:35.4pt'><span
lang=EN-US>federation: federation.forward -> win-host B, fanout, D, AD,I<o:p></o:p></span></p>
<p class=MsoNormal style='text-indent:35.4pt'><span lang=EN-US>And additional
Queue:<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:70.8pt'><span lang=EN-US>federation:
federation.forward -> win-host, TTL,D<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>What are these Exchange and Queues used for
?<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Are they reserved for federation internal
use ?<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>When do messages go into these queues ?<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Do they have to be durable or is there a
way to configure them as transient ?<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>I would be very interested by a brief
description of how federation works internally.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Thank you<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Cheers<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Denis<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
</div>
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