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<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">That’s true with your current configuration, but if you federate each broker with the other two like I suggested
it is going to work.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt"><o:p> </o:p></span></font></p>
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<p class="MsoNormal" style="margin-left:36.0pt"><b><font size="2" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";font-weight:bold">From:</span></font></b><font size="2" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
Letourneau, John P (John) [mailto:john.letourneau@alcatel-lucent.com] <br>
<b><span style="font-weight:bold">Sent:</span></b> mercoledì 4 gennaio 2012 12:54<br>
<b><span style="font-weight:bold">To:</span></b> Simone Busoli<br>
<b><span style="font-weight:bold">Cc:</span></b> Busoli, Simone; rabbitmq-discuss@lists.rabbitmq.com<br>
<b><span style="font-weight:bold">Subject:</span></b> RE: [rabbitmq-discuss] Federation Configuration and Duplicate Messages<o:p></o:p></span></font></p>
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<p class="MsoNormal" style="margin-left:36.0pt"><font size="3" face="Times New Roman"><span style="font-size:12.0pt"><o:p> </o:p></span></font></p>
<p class="MsoNormal" style="margin-left:36.0pt"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Simone,<o:p></o:p></span></font></p>
<p class="MsoNormal" style="margin-left:36.0pt"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">If I were to set hops=1, then a message posted at N1 would go to N2 but will NOT go
to N3. This has been verified.<o:p></o:p></span></font></p>
<p class="MsoNormal" style="margin-left:36.0pt"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Similarly a message posted at N3 would go to N2 but NOT go to N1.<o:p></o:p></span></font></p>
<p class="MsoNormal" style="margin-left:36.0pt"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></font></p>
<p class="MsoNormal" style="margin-left:36.0pt"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">-John<o:p></o:p></span></font></p>
<p class="MsoNormal" style="margin-left:36.0pt"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></font></p>
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<p class="MsoNormal" style="margin-left:36.0pt"><b><font size="2" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";font-weight:bold">From:</span></font></b><font size="2" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
Simone Busoli [mailto:simone.busoli@gmail.com] <br>
<b><span style="font-weight:bold">Sent:</span></b> Tuesday, January 03, 2012 3:16 PM<br>
<b><span style="font-weight:bold">To:</span></b> Letourneau, John P (John)<br>
<b><span style="font-weight:bold">Cc:</span></b> Busoli, Simone; rabbitmq-discuss@lists.rabbitmq.com<br>
<b><span style="font-weight:bold">Subject:</span></b> Re: [rabbitmq-discuss] Federation Configuration and Duplicate Messages<o:p></o:p></span></font></p>
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<p class="MsoNormal" style="margin-left:36.0pt"><font size="3" face="Times New Roman"><span style="font-size:12.0pt"><o:p> </o:p></span></font></p>
<p style="margin-left:36.0pt"><font size="3" face="Times New Roman"><span style="font-size:12.0pt">Inline<o:p></o:p></span></font></p>
<p style="margin-left:36.0pt"><font size="3" face="Times New Roman"><span style="font-size:12.0pt">On Jan 3, 2012 4:52 PM, "Letourneau, John P (John)" <<a href="mailto:john.letourneau@alcatel-lucent.com">john.letourneau@alcatel-lucent.com</a>> wrote:<br>
><br>
> Well, perhaps a bit more about my configuration 8-)<br>
><br>
> 3 nodes…call them N1, N2, N3.<br>
><br>
> On each I have federation configured.<br>
><br>
> N2 – exchange log, connects to N1/log and N3/log<br>
><br>
> N3 – exchange log, connects to N2/log<br>
><br>
> Right now I cannot seem to have the N1 exchange log connect to N2/log; will need to find out why sometime.<br>
><br>
> I do it this way so that regardless of where the producer of the log message is, everyone everywhere will see it.<o:p></o:p></span></font></p>
<p style="margin-left:36.0pt"><font size="3" face="Times New Roman"><span style="font-size:12.0pt">If this is your aim, can't you simply federate the log exchange on each broker with the other two and set max hops to 1?<o:p></o:p></span></font></p>
<p style="margin-left:36.0pt"><font size="3" face="Times New Roman"><span style="font-size:12.0pt">><br>
> <br>
><br>
> Each layer in the hierarchy only knows about nodes in adjacent layers…N2 being the busy one with a layer above and below.<br>
><br>
> If everyone has hops=1, sending a log message to N1/log will only go to N2 and not N3 [this is correct].<br>
><br>
> Setting hops=4, sending a log to N1/log will go to N2 and N3…it will also be returned to N2 thus a consumer on N2 will see the original msg AND the one sent via N2/N3 federation link. Also N3 sees it twice also for a total of once on N1, twice on N2, and
twice on N3…the message took a total of 4 hops.<br>
><br>
> <br>
><br>
> So, this is what I mean by ‘one might expect’ 8-)<br>
><br>
> -John<br>
><br>
> <br>
><br>
> From: Busoli, Simone [mailto:<a href="mailto:Simone.Busoli@ferrari.com">Simone.Busoli@ferrari.com</a>]
<br>
> Sent: Tuesday, January 03, 2012 10:23 AM<br>
> To: Letourneau, John P (John); <a href="mailto:rabbitmq-discuss@lists.rabbitmq.com">
rabbitmq-discuss@lists.rabbitmq.com</a><br>
> Subject: RE: Federation Configuration and Duplicate Messages<br>
><br>
> <br>
><br>
> Hi John, I’m not sure about this:<br>
><br>
> <br>
><br>
> As one might expect, this sometimes results in the message being seen >1 time at some clients.<br>
><br>
> <br>
><br>
> It shouldn’t be the expected behavior except for certain scenarios (i.e. disconnection of the brokers). Am I missing something perhaps?<br>
><br>
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