RE: Appserver Queues Filling Up

[Ben Knight]

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

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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
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Re: Appserver Queues Filling Up

[Christopher Schultz]

-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
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Re: Appserver Queues Filling Up

[Juha Laiho]

On 05/10/2010 11:35 PM, Ben Knight wrote:

Apache version:2.2.3
JBoss version:  5
JBoss Web: 2.1.3.GA
mod_jk:   1.2.30

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.


Those symptoms look like an application deadlock.

Thread dump of the Java server processes at time of the hang might
well help (hoping that the deadlock is not bad enough to prohibit
logging the thread dump).
--
..Juha

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