<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 12 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Hi all,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I’m kindly asking for your expertise on a problem we have with PGPool and failover.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Our setup contains two database servers, one running as primary and one as slave.<o:p></o:p></p><p class=MsoNormal>We installed automatic failover and it seems to be working very well when the primary node goes down.<o:p></o:p></p><p class=MsoNormal>The standby server is promoted to primary and our java application continues working with no problems.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The problem that we have occurs when a slave node goes down.<o:p></o:p></p><p class=MsoNormal>PGPool starts being busy and PGPoolAdmin does not open any pages but it keeps waiting server responses for long (until timeout).<o:p></o:p></p><p class=MsoNormal>When I try to stop pgpool from the command line on the server, it just won’t do it, but it keeps stopping it forever.<o:p></o:p></p><p class=MsoNormal>If I start again the failed slave, I can see in postgres logs that it connects to the primary node for replication, but I’m not able to open the PGPoolAdmin status page to click the Return button.<o:p></o:p></p><p class=MsoNormal>PGPool seems to be waiting for something, but I’m not able to understand what is it.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>We use pgpool2-V3_2_STABLE, checked out from the repository (4-Oct-2012).<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>In pgpool.conf we have set<o:p></o:p></p><p class=MsoNormal>fail_over_on_backend_error: /usr/local/etc/failover.sh %d "%h" %p %D %m %M "%H" %P <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>and in failover.sh:<o:p></o:p></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Courier New"'>if [ $failed_node_id = $old_primary_node_id ];then # master failed<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Courier New"'> touch $trigger # let standby take over<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Courier New"'> echo "Primary database "$failed_host_name" failed, please check the status of your replication system. Trigger used: "$trigger | mail -s "Ditaweb primary database failed" $admin_email<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Courier New"'>else<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Courier New"'> echo "Slave database "$failed_host_name" failed, please check the status of your replication system." | mail -s "Ditaweb slave database failed" $admin_email<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Courier New"'>fi<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The above script works fine as the ‘slave failed’ email is sent, and in the case when the primary node goes down failover is executed successfully.<o:p></o:p></p><p class=MsoNormal>I’ve also attached pgpool.conf in case you need it.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>So, I guess the question is what makes PGPool having this behavior?<o:p></o:p></p><p class=MsoNormal>Is it something that we need to setup in pgpool.conf, some kind of timeout?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thank you in advance for you time,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Regards,<o:p></o:p></p><p class=MsoNormal>Stelios Limnaios<o:p></o:p></p></div></body></html>