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<a href="https://community.jboss.org/index.jspa" style="text-decoration: none; color: #E1E1E1">JBoss Community</a></h1>
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Problem with pgpool2 degenerate one of the databases with messaging is involved
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created by <a href="https://community.jboss.org/people/fharms">Flemming Harms</a> in <i>JBoss Messaging</i> - <a href="https://community.jboss.org/message/787067#787067">View the full discussion</a>
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<div class="jive-rendered-content"><p><span style="color: #222222; font-family: arial; font-size: small; background-color: #ffffff;">Hi Guys</span></p><p><br style="color: #222222; font-family: arial; font-size: small; background-color: #ffffff;"/></p><p><span style="color: #222222; font-family: arial; font-size: small; background-color: #ffffff;">I'm investigated a problem we have with pgpool2 degenerate one of the databases in the cluster. JBoss messaging 1.4.8-SP2 is involved in the process and actual it happen when the statement below is executed. Since messaging communicate through pgpool I do not suspect at this point it has anything to do with messaging.</span></p><p><br style="color: #222222; font-family: arial; font-size: small; background-color: #ffffff;"/></p><p><span style="color: #222222; font-family: arial; font-size: small; background-color: #ffffff;">"DELETE</span></p><p><span style="color: #222222; font-family: arial; font-size: small; background-color: #ffffff;">FROM JBM_MSG WHERE MESSAGE_ID = $1 AND NOT EXISTS (SELECT</span></p><p><span style="color: #222222; font-family: arial; font-size: small; background-color: #ffffff;">JBM_MSG_REF.MESSAGE_ID FROM JBM_MSG_REF WHERE JBM_MSG_REF.MESSAGE_ID =</span></p><p><span style="color: #222222; font-family: arial; font-size: small; background-color: #ffffff;">$2)"</span></p><p><br style="color: #222222; font-family: arial; font-size: small; background-color: #ffffff;"/></p><p><span style="color: #222222; font-family: arial; font-size: small; background-color: #ffffff;">But I got this questions from pgpool forum:</span></p><p><br style="color: #222222; font-family: arial; font-size: small; background-color: #ffffff;"/></p><p><span style="color: #222222; font-family: arial; font-size: small; background-color: #ffffff;">Well there some possibilities:</span></p><p><br style="color: #222222; font-family: arial; font-size: small; background-color: #ffffff;"/></p><p><span style="color: #222222; font-family: arial; font-size: small; background-color: #ffffff;">1) JBoss uses functions which has side effect(updating tables).</span></p><p><br style="color: #222222; font-family: arial; font-size: small; background-color: #ffffff;"/></p><p><span style="color: #222222; font-family: arial; font-size: small; background-color: #ffffff;">2) JBoss uses triggers which updates the table in question.</span></p><p><br style="color: #222222; font-family: arial; font-size: small; background-color: #ffffff;"/></p><p><span style="color: #222222; font-family: arial; font-size: small; background-color: #ffffff;">3) the transaction updating the table in question committed on node 1</span></p><p><span style="color: #222222; font-family: arial; font-size: small; background-color: #ffffff;">   but not committed on node 0 for some reason. Maybe the connection</span></p><p><span style="color: #222222; font-family: arial; font-size: small; background-color: #ffffff;">   between JBoss and pgpool between those two commit commands were</span></p><p><span style="color: #222222; font-family: arial; font-size: small; background-color: #ffffff;">   disconnected?</span></p><p><br style="color: #222222; font-family: arial; font-size: small; background-color: #ffffff;"/></p><p><span style="color: #222222; font-family: arial; font-size: small; background-color: #ffffff;">I have searched through the code and AFAIK <span style="color: #222222; font-family: arial; font-size: small; background-color: #ffffff;">messaging</span> are not using any functions or triggers, right?</span></p><p><br style="color: #222222; font-family: arial; font-size: small; background-color: #ffffff;"/></p><p><span style="color: #222222; font-family: arial; font-size: small; background-color: #ffffff;"><span>Link pgpool post </span><a class="jive-link-external-small" href="http://www.pgpool.net/pipermail/pgpool-general/2012-December/001284.html" target="_blank">http://www.pgpool.net/pipermail/pgpool-general/2012-December/001284.html</a></span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="color: #222222; font-family: arial; font-size: small; background-color: #ffffff;"><span style="color: #222222; font-family: arial; font-size: small; background-color: #ffffff;">Any help will be appreciated</span>, thanks!</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="color: #222222; font-family: arial; font-size: small; background-color: #ffffff;">Cheers,</span></p><p><span style="color: #222222; font-family: arial; font-size: small; background-color: #ffffff;">Flemming<br/></span></p></div>
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<p style="margin: 0;">Reply to this message by <a href="https://community.jboss.org/message/787067#787067">going to Community</a></p>
<p style="margin: 0;">Start a new discussion in JBoss Messaging at <a href="https://community.jboss.org/choose-container!input.jspa?contentType=1&containerType=14&container=2042">Community</a></p>
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