An application that has been running fine for years now suddenly does perform with varying results, sometimes as quick as always, but then sometimes a simple page request uses up to 30 seconds.
Since the performance did degrade we regularly find log items like the following one in catalina.out (many of them, about 100 to 300 per hour on each host):
04.04.2013 11:51:53 org.apache.catalina.tribes.group.interceptors.TcpFailureDetector memberDisappeared INFO: Verification complete. Member still alive[org.apache.catalina.tribes.membership.MemberImpl[tcp://{-64, -88, 6, 21}:4000,{-64, -88, 6, 21},4000, alive=1706334,id={-99 120 -58 21 -84 121 74 45 -104 -73 -123 -40 10 -76 70 59 }, payload={}, command={}, domain={}, ]]
We ruled out that the recent changes to said application are the cause for the poor performance y simulating all sorts of heavy load on various test systems. It just works nicely in the test environment. However, on production it does not.
We are using the SimpleTcpCluster solution for clustering on Tomcat 6. The cluster has two nodes.
I am NOT suspecting a tomcat bug. And as I said I am not suspecting a performance bottleneck in our application or in the db queries it performs. At the moment I am thinking of a hardware failure of some kind (network interface, router etc.).
Do you have any experience with this problem and what did you do to resolve it?
Thanks, Andy --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
