Chris,
> -Original Message-
> From: Christopher Schultz
> Sent: Friday, May 31, 2024 12:50 PM
> To: users@tomcat.apache.org
> Subject: Re: Database Connection Requests Initiated but Not Sent on the Wire
> (Some, Not All)
>
> Eric,
>
> On 5/31/24 13:44, Eric Robinson wrote:
> >>
On 5/31/2024 11:44 AM, Mark Thomas wrote:
On 31/05/2024 16:09, Eric Robinson wrote:
The results are looking great so far.
Excellent.
Here's what we know:
Before the patch, we had 2 load-balanced tomcats in production for
this customer. Due to the driver search bottleneck, we were seeing
Eric,
On 5/31/24 13:44, Eric Robinson wrote:
-Original Message-
From: Christopher Schultz
Sent: Friday, May 31, 2024 12:38 PM
To: users@tomcat.apache.org
Subject: Re: Database Connection Requests Initiated but Not Sent on the Wire
(Some, Not All)
Mark,
On 5/31/24 12:44, Mark Thomas
> -Original Message-
> From: Christopher Schultz
> Sent: Friday, May 31, 2024 12:38 PM
> To: users@tomcat.apache.org
> Subject: Re: Database Connection Requests Initiated but Not Sent on the Wire
> (Some, Not All)
>
> Mark,
>
> On 5/31/24 12:44, Mark Thomas wrote:
> > On 31/05/2024 16:09,
Mark,
On 5/31/24 12:44, Mark Thomas wrote:
On 31/05/2024 16:09, Eric Robinson wrote:
The results are looking great so far.
Excellent.
Here's what we know:
Before the patch, we had 2 load-balanced tomcats in production for
this customer. Due to the driver search bottleneck, we were seeing
Eric,
On 5/31/24 11:09, Eric Robinson wrote:
The results are looking great so far.
Here's what we know:
Before the patch, we had 2 load-balanced tomcats in production for this
customer. Due to the driver search bottleneck, we were seeing hundreds of stuck
threads during the slowdown
> -Original Message-
> From: Mark Thomas
> Sent: Friday, May 31, 2024 11:45 AM
> To: users@tomcat.apache.org
> Subject: Re: Database Connection Requests Initiated but Not Sent on the Wire
> (Some, Not All)
>
> On 31/05/2024 16:09, Eric Robinson wrote:
> > The results are looking great so
On 31/05/2024 16:09, Eric Robinson wrote:
The results are looking great so far.
Excellent.
Here's what we know:
Before the patch, we had 2 load-balanced tomcats in production for this
customer. Due to the driver search bottleneck, we were seeing hundreds of stuck
threads during the
The results are looking great so far.
Here's what we know:
Before the patch, we had 2 load-balanced tomcats in production for this
customer. Due to the driver search bottleneck, we were seeing hundreds of stuck
threads during the slowdown periods. To work around this problem, we threw more
Mark,
> -Original Message-
> From: Mark Thomas
> Sent: Thursday, May 30, 2024 9:30 AM
> To: users@tomcat.apache.org
> Subject: Re: Database Connection Requests Initiated but Not Sent on the Wire
> (Some, Not All)
>
> OK.
>
> This is an interim binary patch for 9.0.80 only.
>
> The
Hi Mark,
> -Original Message-
> From: Mark Thomas
> Sent: Thursday, May 30, 2024 9:30 AM
> To: users@tomcat.apache.org
> Subject: Re: Database Connection Requests Initiated but Not Sent on the Wire
> (Some, Not All)
>
> OK.
>
> This is an interim binary patch for 9.0.80 only.
>
> The
ср, 29 мая 2024 г. в 13:34, Mark Thomas :
>
>
>
> It is also problem number 3. The reason it is expensive is that class
> loaders don't cache misses so if a web application has a large number of
> JARs, they all get scanned every time the DriverManager tries to create
> a new connection.
>
>
> The
OK.
This is an interim binary patch for 9.0.80 only.
The purpose is to:
- confirm the proposed change fixes the problem
- provide you with a workaround in the short term
This is the binary patch:
https://people.apache.org/~markt/dev/classloader-not-found-cache-9.0.80-v1.zip
Extract the
Eric,
On 5/29/24 12:10, Eric Robinson wrote:
-Original Message-
From: Mark Thomas
Sent: Wednesday, May 29, 2024 10:19 AM
To: users@tomcat.apache.org
Subject: Re: Database Connection Requests Initiated but Not Sent on the Wire
(Some, Not All)
On 29/05/2024 16:08, Eric Robinson wrote:
On 29/05/2024 17:03, Eric Robinson wrote:
One of the webapps is related to voice reminder messages that go out to people.
The reminders go out sometime after 9 am, which tracks with the slowdowns.
Ack.
Something to try while I work on a patch is setting
archiveIndexStrategy="bloom" on
> -Original Message-
> From: Mark Thomas
> Sent: Wednesday, May 29, 2024 10:19 AM
> To: users@tomcat.apache.org
> Subject: Re: Database Connection Requests Initiated but Not Sent on the Wire
> (Some, Not All)
>
> On 29/05/2024 16:08, Eric Robinson wrote:
>
> > I believe your assessment
Hi Mark,
> -Original Message-
> From: Mark Thomas
> Sent: Wednesday, May 29, 2024 10:10 AM
> To: users@tomcat.apache.org
> Subject: Re: Database Connection Requests Initiated but Not Sent on the Wire
> (Some, Not All)
>
> On 29/05/2024 13:38, Eric Robinson wrote:
> >> -Original
On 29/05/2024 16:08, Eric Robinson wrote:
I believe your assessment is correct. How hard is it to enable pooling? Can it
be bolted on, so to speak, through changes to the app context, such that the
webapp itself does not necessarily need to implement special code?
It looks like - from the
On 29/05/2024 13:38, Eric Robinson wrote:
-Original Message-
From: Mark Thomas
I intend to wok on a patch for Tomcat that will add caching that should
speed things up considerably. I hope to have something for Eric to test
today but it might take me until tomorrow as I have a few
Mark,
A few other thoughts come to mind. See below.
> -Original Message-
> From: Eric Robinson
> Sent: Wednesday, May 29, 2024 7:39 AM
> To: Tomcat Users List
> Subject: RE: Database Connection Requests Initiated but Not Sent on the Wire
> (Some, Not All)
>
> Hi Mark,
>
>
> >
Hi Mark,
> -Original Message-
> From: Mark Thomas
> Sent: Wednesday, May 29, 2024 5:35 AM
> To: users@tomcat.apache.org
> Subject: Re: Database Connection Requests Initiated but Not Sent on the Wire
> (Some, Not All)
>
> On 29/05/2024 10:26, Mark Thomas wrote:
> > On 28/05/2024 16:26,
On 29/05/2024 10:26, Mark Thomas wrote:
On 28/05/2024 16:26, Eric Robinson wrote:
Took a bunch of thread and heap dumps during today's painful debacle.
Will send a link to those as soon as I can.
Thanks. I have them. I have taken a look and I am starting to form a
theory. To help with
On 28/05/2024 16:26, Eric Robinson wrote:
Took a bunch of thread and heap dumps during today's painful debacle. Will send
a link to those as soon as I can.
Thanks. I have them. I have taken a look and I am starting to form a
theory. To help with that I have a couple of questions.
1.
Hi Mark,
See comments below.
> -Original Message-
> From: Mark Thomas
> Sent: Tuesday, May 28, 2024 9:32 AM
> To: Tomcat Users List
> Subject: Re: Database Connection Requests Initiated but Not Sent on the Wire
> (Some, Not All)
>
> Hi Eric,
>
> Follow-up observsations and comments
Hi Eric,
Follow-up observsations and comments in-line.
What time does this problem start?
It typically starts around 9:15 am EDT and goes until around 10:30 am.
Does that match the time of highest request load from the customer?
Rather than a spike, I'm wondering if the problem is
Hi Mark,
> -Original Message-
> From: Mark Thomas
> Sent: Tuesday, May 28, 2024 3:42 AM
> To: users@tomcat.apache.org
> Subject: Re: Database Connection Requests Initiated but Not Sent on the Wire
> (Some, Not All)
>
> Hi Eric,
>
> I have a some follow-up questions in-line. I have also
Hi Eric,
I have a some follow-up questions in-line. I have also read the other
messages in this thread and added a couple of additional questions based
on what I read in those threads.
On 26/05/2024 02:58, Eric Robinson wrote:
One of our hosting customers is a medical practice using a
Hi Chuck,
> -Original Message-
> From: Chuck Caldarale
> Sent: Sunday, May 26, 2024 2:21 PM
> To: Tomcat Users List
> Subject: Re: Database Connection Requests Initiated but Not Sent on the Wire
> (Some, Not All)
>
>
> > On May 25, 2024, at 20:58, Eric Robinson wrote:
> >
> > One of
Hi Thomas,
> -Original Message-
> From: Thomas Hoffmann (Speed4Trade GmbH)
>
> Sent: Sunday, May 26, 2024 3:30 PM
> To: Tomcat Users List
> Subject: AW: Database Connection Requests Initiated but Not Sent on the Wire
> (Some, Not All)
>
> Hello,
>
> > -Ursprüngliche Nachricht-
> On May 25, 2024, at 20:58, Eric Robinson wrote:
>
> One of our hosting customers is a medical practice using a commercial EMR
> running on tomcat+mysql. It has operated well for over a year, but users have
> suddenly begun experiencing slowness for about an hour at the same time every
>
Hi Thomas,
> -Original Message-
> From: Thomas Hoffmann (Speed4Trade GmbH)
>
> Sent: Sunday, May 26, 2024 2:52 AM
> To: Tomcat Users List
> Subject: AW: Database Connection Requests Initiated but Not Sent on the Wire
> (Some, Not All)
>
> Hello Eric,
>
> > -Ursprüngliche
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