2016-08-11 21:33 GMT+02:00 John Huss <johnth...@gmail.com>: > I have verified that in version 8.0.36 of tomcat jdbc the validation query > functionality does not commit the transaction it starts in order to run the > validation query, which can cause an open transaction for a very long time > (possibly until the database crashes). This seems to be especially > problematic if you have a large pool where the connections are idle for a > large period of time. > > I also tested against version 9.0.0M9, and in that version the problem is > fixed. However, nothing about this appears in the release notes for any > version (9.0, 8.5, or 8.0). If this bug has indeed been fixed it should be > documented in the release notes. Also, back-porting the fix to the 8.0 > branch would be very helpful. > > For the time being I am working around the problem by changing my > validation query from "SELECT 1" to be "SELECT 1; COMMIT" (using > postgresql). This prevents the issue.
I wonder why a validationQuery needs to open a new transaction > > This was reported previously (three years ago) here: > https://mail-archives.apache.org/mod_mbox/tomcat-users/201301.mbox/%3CCAPw873vy%2B9kWMQiFPbnTX6g1FSQ8oTVhDJ3Zagp9UkUZ3d5qjw%40mail.gmail.com%3E > > Thanks, > John --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
