[jboss-user] [JBoss Messaging] - Problem with pgpool2 degenerate one of the databases with messaging is involved

[Flemming Harms]

Flemming Harms [https://community.jboss.org/people/fharms] created the discussion

"Problem with pgpool2 degenerate one of the databases with messaging is involved"

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Hi Guys


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.


"DELETE
FROM JBM_MSG WHERE MESSAGE_ID = $1 AND NOT EXISTS (SELECT
JBM_MSG_REF.MESSAGE_ID FROM JBM_MSG_REF WHERE JBM_MSG_REF.MESSAGE_ID =
$2)"


But I got this questions from pgpool forum:


Well there some possibilities:


1) JBoss uses functions which has side effect(updating tables).


2) JBoss uses triggers which updates the table in question.


3) the transaction updating the table in question committed on node 1
   but not committed on node 0 for some reason. Maybe the connection
   between JBoss and pgpool between those two commit commands were
   disconnected?


I have searched through the code and AFAIK messaging are not using any functions or triggers, right?


Link pgpool post http://www.pgpool.net/pipermail/pgpool-general/2012-December/001284.html

Any help will be appreciated, thanks!

Cheers,
Flemming
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