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From "David Jencks (JIRA)" <>
Subject [jira] Commented: (GERONIMO-4222) Database pool unusable after database unavailable for awhile
Date Mon, 21 Sep 2009 08:52:18 GMT


David Jencks commented on GERONIMO-4222:

Jack,  I was working on the sqlstate exception sorter and just implemented ConnectionPoolDataSource
wrapping before I saw your work. I'll compare our approaches and look at the vendor wrappers

Radim,  I haven't looked into this in a long time, but I think that the standard behavior
for uncommitted work when putting a connection back in the pool is to commit it.  However,
the problem we are dealing with here is that on a connection error, after removing the connection
from the pool so it won't be used ever again, we are not trying to rollback work on it before
destroying it.  If we could tell if the connection was actually still usable, we wouldn't
close it at all if the rollback could succeed...  so two things to do are to improve our decision
of when to close the connection (using a ConnectionPoolDataSource, and a better ExceptionSorter)
and trying to rollback before destroy just in case we were wrong about needing to destroy
the connection.

> Database pool unusable after database unavailable for awhile
> ------------------------------------------------------------
>                 Key: GERONIMO-4222
>                 URL:
>             Project: Geronimo
>          Issue Type: Bug
>      Security Level: public(Regular issues) 
>    Affects Versions: 2.0.2, 2.1.3, 2.1.4
>         Environment: Red Hat Enterprise Linux Server v5.2
> WAS-CE v2.0.0.1, based on Geronimo v2.0.2
>            Reporter: David Frahm
>            Assignee: Jack Cai
>             Fix For: Wish List
>         Attachments: before and after wasce restart.txt, connector.patch, PGtrial.patch,
stacktrace.txt, tranql-connector-derby-embed-local-1.5-SNAPSHOT.rar, tranql-connector-derby-embed-xa-1.5-SNAPSHOT.rar,
tranql-connector-mysql-local-1.3-SNAPSHOT.rar, tranql-connector-mysql-xa-1.3-SNAPSHOT.rar,
tranql-connector-postgresql-common-1.1.jar, tranql-connector-postgresql-local-1.2-SNAPSHOT.rar,
tranql-connector-postgresql-xa-1.2-SNAPSHOT.rar, vendors.patch
> I have frequent trouble with my database pool to an AS/400.  The database is taken down
every night for backup, and at least once a week the connection pool is unusable after the
database comes back up.  Restarting the connection pool makes everything work again. 
> We are new to Geronimo/WAS-CE -- just this one app on one server -- so I don't have anything
to compare to.  However, we have had this same issue with a couple 1.x/1.1.x versions before
we upgraded to v2.  Also, there are several WebSphere (full WAS, not WAS-CE) apps that do
not have this trouble.
> Configuration Info
> Driver: JTOpen v6.1 (
> Pool Min Size: 0
> Pool Max Size: 100
> Blocking Timeout: 5000
> Idle Timeout: 15

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