"Mark Thomas" <ma...@apache.org> wrote in message news:4a40e12c.2070...@apache.org... > Narendra Sarkar wrote: >> Hi, >> We have a multi threaded environment. We have noticed that thread blocks >> for >> 10 to 20 minutes due DBCP getConnection method call. Then, we >> investigated >> the source code of DBCP(commons-dbcp-1.2.1-PII.jar) and noticed that >> createConnection method is synchronized. This problem occur more >> frequently >> when we have lower value of MaxIdleConnection parameter. After increasing >> the value of MaxIdleConnection parameter, frequency of blocking get >> reduced. >> We then replaced DBCP connection pooling with Oracle Connection pooling >> (ojdbc14.jar) and never encountered blocking issue. >> >> I think the issue is with that createConnection method of DBCP >> synchronization. We have taken Thread dump to do above analysis. > > Yep, known issues with commons-pool. Should be fixed in 1.5.1. Trunk has > been updated. Proposed for 6.0.x and 5.5.x. Alternatively, there is the > new JDBC pool module.
I'm a little confused now. Filip pointed me to the jdbp-1.0.5 package. Is that just repackaged versions of dbcp 1.2.2/pool 1.5? If not, what versions of dbcp/pool are contained within there? If the fix in commons-pool is in 1.5.1, am I still expecting concurrency problems if upgrading 1.5? What would be the best move? Thanks, Eric --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@tomcat.apache.org For additional commands, e-mail: dev-h...@tomcat.apache.org
