@tomcat.apache.org
Subject: Re: Pointers on diagnosing session and thread hangs
"For curiosity's sake, why did you roll your own DB pooling, rather than
letting Tomcat manage it?"
That is a good question and one I am not sure I can easily answer since
the base code I am working
Jun 2009 13:25:25 -0600
> From: p...@valadd.com
> To: users@tomcat.apache.org
> Subject: Re: Pointers on diagnosing session and thread hangs
>
> "For curiosity's sake, why did you roll your own DB pooling, rather than
> letting Tomcat manage it?"
>
> That is a good que
lpful in sorting this all out.
Pete
Caldarale, Charles R wrote:
From: Pete Helgren [mailto:p...@valadd.com]
Subject: Re: Pointers on diagnosing session and thread hangs
I am looking at the DB Manager code I wrote to see if I am doing
something wrong in implementing the pooling.
For
> From: Pete Helgren [mailto:p...@valadd.com]
> Subject: Re: Pointers on diagnosing session and thread hangs
>
> I am looking at the DB Manager code I wrote to see if I am doing
> something wrong in implementing the pooling.
For curiosity's sake, why did you roll your own DB
It was helpful in at least getting us to the lines of code that needed
some investigating. It appears to be a blocking issue in our JDBC
connections although we don't know what is the cause and why it is so
random. Spent quite a bit of time looking into issues with the Commons
jars, DBCP and
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Pete,
On 6/18/2009 10:52 AM, Pete Helgren wrote:
> Thanks. Looking at the dump I can see there is an issue with a DB
> manager we wrote (Blocking). I'll investigate further.
It's amazing what you can learn just from looking at a few thread dumps
of
osing session and thread hangs
when a thread dump is run, by either method, does Tomcat
stop running at that point?
Nope, keeps on ticking. When you have a hang situation, you usually want to
take several thread dumps a few seconds apart and compare.
- Chuck
THIS COMMUNICATION MAY CO
> From: Pete Helgren [mailto:p...@valadd.com]
> Subject: Re: Pointers on diagnosing session and thread hangs
>
> when a thread dump is run, by either method, does Tomcat
> stop running at that point?
Nope, keeps on ticking. When you have a hang situation, you usually want t
Caldarale, Charles R wrote:
From: Pete Helgren [mailto:p...@valadd.com]
Subject: Re: Pointers on diagnosing session and thread hangs
Not sure how much change to the environment we want to make
before we track down the issue but going to 1.6 is something
we'll consider.
For JDK 1
> From: Pete Helgren [mailto:p...@valadd.com]
> Subject: Re: Pointers on diagnosing session and thread hangs
>
> Not sure how much change to the environment we want to make
> before we track down the issue but going to 1.6 is something
> we'll consider.
For JDK 1.5,
ointers on diagnosing session and thread hangs
"jstack is not currently available on Windows platforms"
Move to a 1.6 JDK; your performance will improve, and you have access to more
tools, including jstack.
- Chuck
THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIET
> From: Pete Helgren [mailto:p...@valadd.com]
> Subject: Re: Pointers on diagnosing session and thread hangs
>
> "jstack is not currently available on Windows platforms"
Move to a 1.6 JDK; your performance will improve, and you have access to more
tools, including js
this problem, on of which crashed with 825 threads
running last night, but I'll continue to pursue a tool that will do
something similar and run in Windows.
Pete
Caldarale, Charles R wrote:
From: Pete Helgren [mailto:p...@valadd.com]
Subject: Re: Pointers on diagnosing session and t
> From: Pete Helgren [mailto:p...@valadd.com]
> Subject: Re: Pointers on diagnosing session and thread hangs
>
> *How* do you dump a thread? And, what is in it?
It's not "a thread" dump, it's a "thread dump" - a capture of the call stacks
of every t
Thanks Chris.
I'll see if I can get the relevant sections from the server.xml. The
folks who have access to the server have gone home for the day.
You said:
Can you also post a thread dump? I'm surprised that Tomcat is exceeding
(or appearing to exceed) its own limit on request processing th
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Pete,
On 6/17/2009 8:33 AM, Pete Helgren wrote:
> I am not an expert by any stretch in Tomcat internals so what I need
> is a way to determine what is causing the sessions to "hang" and the
> threads to begin to grow beyond the maximum (650 in our cas
We are having a devil of a time tracking down why a web app is hanging
while running in Tomcat. We are running version 5.5.27 in Windows XP
with 2Gb RAM. The symptom is that randomly a user will report that they
cannot log into the application. When we view the Tomcat application
using Lambd
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