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 periods. To work around this problem, we threw more
tomcats at it. With 6 tomcats, the load was spread around enough to keep the
bottleneck condition from manifesting badly, and users did not complain as
much. We were still seeing dozens of stuck threads, but not hundreds.
After the patch, we went back to 2 tomcats. During the same timeframe today,
there have been 1 stuck thread on Tomcat A and 6 on Tomcat B.
If the numbers hold, this works out to roughly a 10,000% improvement.
This deserves a bonus, much of which you should share with markt. ;)
-chris
-----Original Message-----
From: Eric Robinson <eric.robin...@psmnv.com>
Sent: Friday, May 31, 2024 5:54 AM
To: Tomcat Users List <users@tomcat.apache.org>
Subject: RE: Database Connection Requests Initiated but Not Sent on the Wire
(Some, Not All)
Mark,
-----Original Message-----
From: Mark Thomas <ma...@apache.org>
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 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-9.0.8
0-
v1.zip
Extract the contents into $CATALINA_HOME/lib
You should end up with:
$CATALINA_HOME/lib/org/apache/...
Usual caveats apply. This is not an official release. Use it at your
own risk. Don't blame either me or the ASF it is results in alien
invasion, a tax bill, the server catching fire or anything else unexpected
and/or unwanted.
Longer term, I'm not sure this is exactly how I want to fix it in
Tomcat. I am convinced of the need to cache classes that don't exist
but exactly where / how to do that and what degree of control the user should
have is very much TBD.
I suspect this will be a topic of discussion at Community Over Code at
Bratislava next week.
I am expecting that any fix won't be in the June release round but
should be in the July release round.
Let us know how you get on and good luck.
The changes have been applied. We'll know at around 9:30 am EST if they have
had the desired effect. Fingers crossed!
Mark
On 30/05/2024 10:16, Mark Thomas wrote:
On 29/05/2024 17:03, Eric Robinson wrote:
<snip/>
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 the resources.
You'd configure that in META-INF/context.xml something like this:
<Context>
<Resources archiveIndexStrategy="bloom" /> </Context>
Mark
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