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<p class=MsoNormal><span lang=EN-US>I’am testing shovel with Rabbit 2.7.1.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>I set two clusters of 2 hosts RedHat 6, and
a shovel configuration to forward incoming messages from one <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>cluster to the other.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Messages shoveled from one cluster to the
other, are travelling through a bridge (Linux machine configured as bridge).<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>I can change the bridge configuration to simulate
a WAN (slow speed, add latency, lose some packets), <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>I also can cut the WAN by resetting the
bridge, wait a while and then reconnect it, to simulate a network outage.<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>The input throughput is about 4Mbit/s.<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>In most of cases everything is fine, I just
notice two things : <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>First:<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 slow the WAN to 1 Mbit/s, I see messages
accumulating in the shovel queue, which is what as expected.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Then once my throughput go to zero,
messages are slowly transferred to the distant cluster, and that’s OK as
well.<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>The problem is that messages are not
processed in the same order on the distant cluster than on the local.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>My feeling is that with 1 Mbit/s some
messages fail to be transferred correctly, and are re-sent later.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>( I have the same problem when I simulate a
very high level of packet loss (30%), with a 10Mbit/s speed)<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>Is there such a logic in Shovel ?<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Is there a way to configured Shovel to
guaranty the sequence of messages ?<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>Second:<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 a simulate a WAN outage lasting 2
hours, messages staying in the shovel queue have a status, <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>first set to “unacknowledged”. <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Then, after about 900 sec, they all
have their status changed to “ready”.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>When the network recovers, all the pending
messages change back to “unacknowledged”, before being sent<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>to the distant cluster.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>It does not seems to be a problem for us,
just I’d like to understand this behavior, and if it could impact rabbit
performances.<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><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Denis<o:p></o:p></span></p>
</div>
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