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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><p><font face='microsoft sans serif' color='Black' size='2'></font><font face='microsoft sans serif' color='Blue' size='2'>Classification: </font><font face='microsoft sans serif' color='Black' size='2'>Open</font></p><div class=WordSection1><p class=MsoNormal>When rabbitmq is clustered with one other node we see a very slow dequeue of messages. The scenario is simple, Node A and Node B in the cluster. They are clustered with the auto_heal option and default netticktime. Steps to repeat are:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoListParagraph>(These are all local connections)<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>(1)<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Connect client A1 to Node A<o:p></o:p></p><p class=MsoListParagraph style='margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>a.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Client A1 creates a topic exchange<o:p></o:p></p><p class=MsoListParagraph style='margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>b.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Client A1 is a publisher with 1msg/sec<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>(2)<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Connect client A2 to Node A<o:p></o:p></p><p class=MsoListParagraph style='margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>a.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Client A1 listens for the messages in the exchange<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>(3)<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Connect client B to Node B (this is important, the issue does not occur unless you have this remote client)<o:p></o:p></p><p class=MsoListParagraph style='margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>a.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Client B listens for the messages in the exchange<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>(4)<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Pull the plug on Node B (you will not see the issue with a graceful shutdown), alternately you can just use “route” to now make Node B not routable from Node A<o:p></o:p></p><p class=MsoListParagraph style='margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>a.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>If you kill rabbitmq, you will not see the issue<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>(5)<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Wait for netticktime (or until you see NodeB being removed from the cluster in Node A’s log)<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>(6)<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Client A2 no longer receives messages at 1msg/sec, it will fall considerably behind but recover in about 10 mins.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>We have two setups with slightly different network setups (two pairs of Node A and B). One we see this issue on, the other we do not, so this is not an issue that can be always reproduced.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Other issues observed in this state:<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>rabbitmqctl cluster_status/list_queues/list_connections/list_exchanges all hang, rabbitmq status does not hang<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>declareQueue, declareExchange, declareExchangePassive all hang<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>disabling auto_heal does not help<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>tested with both Erlang 5.9 and 5.10.3<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>tested with both RabbitMq 3.1.5 and 3.1.3, same issue in both<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>don’t see this issue with direct exchange<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>nothing in vmstat out of the ordinary, CPU is not pegged, system is not thrashing<o:p></o:p></p><p class=MsoListParagraph><o:p> </o:p></p><p class=MsoNormal>Things we have ruled out:<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>Iptables, tested with no rules<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>Selinux, tested in permissive<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>Java drivers<o:p></o:p></p><p class=MsoListParagraph style='margin-left:1.0in'><o:p> </o:p></p><p class=MsoNormal>Same thing as described here:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><a href="http://lists.rabbitmq.com/pipermail/rabbitmq-discuss/2013-June/027674.html">http://lists.rabbitmq.com/pipermail/rabbitmq-discuss/2013-June/027674.html</a><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thank you,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><b><span style='font-size:13.0pt'>Greg Gentling<o:p></o:p></span></b></p><p class=MsoNormal>Principal Software Architecture - Avant CommonApps<o:p></o:p></p><p class=MsoNormal>Thales Avionics, Inc.<o:p></o:p></p><p class=MsoNormal>In-Flight Entertainment and Connectivity<o:p></o:p></p><p class=MsoNormal>Irvine, CA 92618<o:p></o:p></p><p class=MsoNormal>949-595-4943<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div><p><font face='microsoft sans serif' color='Black' size='2'>[@@OPEN@@]<br> <br>This email was classified by </font><font face='microsoft sans serif' color='Blue' size='2'>GENTLING Gregory</font><font face='microsoft sans serif' color='Black' size='2'> on Tuesday, December 03, 2013 5:52:25 PM.</font></p></body></html>