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https://issues.apache.org/jira/browse/AXIS2-6009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17405173#comment-17405173
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Eoghan O'Hare commented on AXIS2-6009:
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Hi Robert,
The soft limit (-S) for root I had increased to 10000 (from 1024), the hard
limit (-H) for open files for root was 262144 (that was the default already for
the system).
I changed the /etc/security/limits.conf for root to unlimited;
root soft nofile unlimited
The ulimit -S -n now also shows 262144 (the same as the hard limit).
After this change I got the same behavior for the load test.
Based on the RHEL article -XX:+MaxFDLimit is supposed to be set by default. To
confirm, here is the default java VM argument from the system for MaxFDLimit.
[root@pmdpriepm52 VPAppIntfClient]# java -XX:+PrintFlagsFinal | grep MaxFD
bool MaxFDLimit = true \{product}
I explicitly set -XX:+MaxFDLimit in the JAVA_OPTS of the application just to be
sure. No difference.
When running the load test there was nothing outputted to /var/log/messages or
/var/log/secure unfortunately.
Is there any reason other than ulimits that could prevent the number of http
connections increasing above 5? I am not seeing any exceptions in the apache
logs or anything.
I tried to go through the httpclient code on github, got to a certain point,
but it was not easy to follow around the connection manager and leasing
connections from the pool etc.
Is there any additional apache httpclient tracing you think I could enable that
would help debug?
Regards,
Eoghan
> ServiceClient::createClient intermittently under load blocks for 5 seconds
> --------------------------------------------------------------------------
>
> Key: AXIS2-6009
> URL: https://issues.apache.org/jira/browse/AXIS2-6009
> Project: Axis2
> Issue Type: Bug
> Affects Versions: 1.7.9
> Reporter: Eoghan O'Hare
> Priority: Major
> Attachments: ExceptionStackTrace.txt, axis2.xml, axis2client.7z,
> axis2client_httpclient4.log
>
>
> Using the axis2-kernel-1.7.9.jar.
> Our application is using automatically generated WS stubs for asynchronous
> SOAP web services over https.
> ServiceClient::createClient is called for every asynchronous web service
> request.
> Callbacks are registered using OperationClient::setCallback().
> The non blocking web service request is sent by the API
> OperationClient::execute(false).
> The option isUseSeparateListener is set to false.
> The default number of http connections are created, this is two from looking
> at pcap traces.
> Under low load rates, 20 requests per second, 1000 total requests,
> intermittently the call to ServiceClient::createClient blocks the calling
> thread for 5 seconds. Seems to be just over 5 seconds every time it occurs
> (between 5000ms and 5030ms), so it sounds like some timeout.
> The blocking seems to occur when a response to a previous web service is
> received at a similar time.
> After the 5 second blocking, an Exception is thrown from axis2 to our
> applications error callback. Exception stack trace is attached.
> I have tried to enable axis2 logging on the client side however there was
> nothing obvious in it from my point of view. Attaching the log. In the log
> the 5 second delay is between;
> 06:47:50:574
> 06:47:55:579
> If you require additional logging to be enabled to debug please let me know.
> Or if you need any further information, please let me know.
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