RE: Appserver Queues Filling Up
Hey Chris, Thanks for the reply. We have yet to do a thread dump. I was actually waiting for the queues to fill up again to do just that. In the meantime, I have JBoss v. 5.1.0GA and JBoss web v. 2.1.3GA. Which versions of Tomcat have had problems? Thanks Ben -Original Message- From: Christopher Schultz [mailto:ch...@christopherschultz.net] Sent: Tuesday, May 11, 2010 12:40 PM To: Tomcat Users List Subject: Re: Appserver Queues Filling Up -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Ben, On 5/10/2010 4:35 PM, Ben Knight wrote: > We are having a Wicket-based Java application deployed in a production > server cluster using Apache (2.2.3) with mod_jk (1.2.30) as load balancing > component w/ sticky session and Jboss 5 as application container for the > Java application. Do you know what version of Tomcat is being used in that version of JBoss? Recently, there have been some problems identified with a few connectors that can cause deadlock at the connector level. Have you looked at a thread dump of your webapp to see what the request processor threads are doing? - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkvpiGAACgkQ9CaO5/Lv0PDfTgCgwHUyW57kRx02K9xn5AsWN41y wZoAnRDiXNuv71fruZE3ejPTWlqA2Jyx =h6dq -END PGP SIGNATURE- - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Appserver Queues Filling Up
Apache version:2.2.3 JBoss version: 5 JBoss Web: 2.1.3.GA <http://2.1.3.ga/> mod_jk: 1.2.30 Dear community, We are having a Wicket-based Java application deployed in a production server cluster using Apache (2.2.3) with mod_jk (1.2.30) as load balancing component w/ sticky session and Jboss 5 as application container for the Java application. We are inconsistently seeing an issue in our production environment where our AJP queues between Apache and Jboss as shown in the JMX console fill up with requests to the point where the application server is no longer taking on any new requests. When looking at all involved system components (overall traffic, load db, process list db, load of all clustered application server nodes) nothing points towards a capacity issue which would explain why the calls are being stalled in the AJP queue. Instead all systems appear sufficiently idle. So far, our only remedy to this issue is to restart the appservers and the load balancer which only occasionally clears the AJP queues. We are trying to figure out why the queues are filling up to the point that no calls get returned to the end user although the system is not under a high load. Has anyone else experienced similar problems? Are there any other system metrics we should monitor that could explain the queuing behavior? Is this potentially a mod_jk issue? If so, is it advisable to swap mod_jk with mod_cluster to resolve the issue? Any advice is highly appreciated. If I can provide additional information for the sake of troubleshooting I would be more than willing to do so. /Ben *Ben Knight* System Engineer • Fi *T:* +1 212 941 5220 / *M:* +1 917 664 0297 ben.kni...@f-i.com / www.f-i.com This communication is confidential and is only intended for the use of the individual or entity to which it is directed. It may contain information that is privileged and exempt from disclosure under applicable law. If you are not the Intended recipient, please notify us immediately. You should not copy it or disclose its content to any other person.
