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https://jira.jboss.org/jira/browse/JBAS-7788?page=com.atlassian.jira.plug...
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deanhiller commented on JBAS-7788:
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What if you just did a read from the db like in oracle select sysdate from dual after a
failure? if that fails, then don't you know it was the connection that failed?
doesn't that allow you to never have to call the check-valid-sql stuff before the
transaction starts to get rid of that performance penalty. Also, I am not as worred about
the performance as I am that this is breaking seam from working correctly.
If check-valid-sql failed, well, the whole transaction was bad and then we can check the
next connections with check-valid-sql first because we know one connection was bad, the
others may now be bad too as in the db being down.
my email dean at xsoftware.biz if you want to discuss more.
<check-valid-connection-sql> done after a failure maybe?
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Key: JBAS-7788
URL:
https://jira.jboss.org/jira/browse/JBAS-7788
Project: JBoss Application Server
Issue Type: Feature Request
Security Level: Public(Everyone can see)
Components: JCA service
Affects Versions: JBossAS-5.1.0.GA
Reporter: deanhiller
Assignee: Jesper Pedersen
Priority: Critical
related directly to this bug in seam
https://jira.jboss.org/jira/browse/JBSEAM-4528
I would prefer the <check-valid-connection-sql> be run AFTER any exceptions from
the jdbc api rather than before it. This would fix half the bug in the ticket referred to
above(at least with postgres' case)....
ie.
1. go get a wrapper connection(not from pool)
2. when you make a real jdbc call, go get the real connection from the pool
3. if that jdbc call fails with an exception, run the check-valid-connection-sql
4. If check-valid-connection-sql fails, go get another connection from pool(or create
one) and if fails, move to next
5. once all connections are exhausted, throw exception back to framework or whoever
called the jdbc call.
NOTE: This gives the performance benefit on sunny day we are never running the check
valid connection sql. It also solves half of the ticket above which tends to break
postgres/jboss/seam combination from working. I have to have check valid connection sql
or my seam app never recovers from a db outage but having that also causes all normal seam
pages that don't need the database to spin the browser into infinite redirect(ie. if I
hit login page it comes up in jboss/seam IF AND ONLY IF I don't have
check-valid-connection-sql set).
thanks,
Dean
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