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Subject Re: Bug that spans tomcat and tomcat-native
Date Fri, 24 Jun 2016 15:37:18 GMT
On Fri, Jun 24, 2016 at 11:18 AM, Mark Thomas <> wrote:
> On 24/06/2016 11:17, Rémy Maucherat wrote:
>> 2016-06-24 12:08 GMT+02:00 Mark Thomas <>:
>>> Thanks.
>>> I'm going to start some local performance testing to confirm I see
>>> similar results and, assuming I do, I'll start looking at fixing this
>>> for 1.2.x/9.0.x and back-porting.
>> Hum, the fix that was submitted doesn't make sense IMO since writes can be
>> async, so I don't see a way besides adding the "error clear" thing after
>> each operation [and we'll remove it once OpenSSL 1.1 is there if it
>> actually fixes it]. That's assuming this issue is real [I actually never
>> noticed anything during my many ab runs and they use a lot of threads, so I
>> have a hard time believing it is significant enough ;) ].
> I haven't been able to reproduce anything like this yet. So far I have
> only been testing with tc-native 1.2.x and Tomcat 9.0.x. I might need to
> test with 1.1.x and Tomcat 7.0.x, the versions used by the OP.
> I'm having trouble understanding how this is happening. I could imagine
> that HashMap becoming a problem if there was a high churn in Threads.
> I'm thinking of something like bursty traffic levels and an executor
> aggressively halting spare threads. I need to experiment with that as well.
> Nate,
> We need as much information as you can provide on how to reproduce this.
> As a minimum we need to know:
> - Connector configuration from server.xml
> - Operating system
> - How tc-native was built
> - Exact versions for everything
> We need enough information to recreate the test and the results
> that you obtained.

Connector configuration:

Keepalive is enabled.

OS: Fedora 22
tc-native: tomcat-native-1.1.34-1.fc22.x86_64
tomcat: tomcat-7.0.68-3.fc22.noarch

This issue was seen in older versions of tomcat:
tomcat-native-1.1.30-2.fc21 and tomcat-7.0.54-3.fc21

All of the builds are the rpms released by fedora from their build machines.

The test I ran performed about 5 million 4k requests and then did the
large 100M requests and was able to see the issue immediately.


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