Reverse proxy AJP and NIO

Hi there,

I'm running some stress tests against an environment that has the following configurations

Apache 2.2.21
Liferay 6.0.11 on top of Tomcat 6.0.32
ICEFaces EE-1.8.2.GA_P03

Apache and Tomcat are configured to connect to each other using the AJP protocol. At some point of the test I got a message in Tomcat log as below:

Code:

GRAVE: All threads (200) are currently busy, waiting. Increase maxThreads (200) or check the servlet status

.

I'm not pretty sure but this seems to be due the Tomcat 6 does not have AJP built with support for NIO, right? Is there a workaround for this? Should I move to Tomcat 7 http://www.tomcatexpert.com/blog/2011/06/17/apache-tomcat-7016-released?

Support for NIO may be part of the solution but the actual behaviour in question may depend on a couple of things:

1. The use of Ajax Push in the stress testing application:

Ajax Push is enabled by default in ICEfaces applications. The default implementation is to using blocking connections to support Ajax Push which would mean potentially 1 thread per client dedicated to supporting Push. If you are not using Ajax Push, you can disable it with a context parameter. If you are using Ajax Push under load and you want to use NIO, then the Enterprise Push Server may be a something to consider (part of the Enterprise package):

http://www.icefaces.org/main/ajax-java/icefaces-ee-1-8.iface

2. How the application is being stress tested.

Since there can be a few things to be aware of when load testing ICEfaces, you should consider reviewing our EE documentation for testing. (Note: You need to be a supported EE customer to access this documentation.)

http://wiki.icesoft.com/display/ICEpack/Home

The specific section on load testing:

http://wiki.icesoft.com/display/ICEpack/Load+Testing

Thanks Deryk,

We are trying to get up and running an instance of Push Server to start a new round of stress tests.

Hello,

It indeed looks like Tomcat 6 NIO is not supported by the AJP connector: Advanced IO and Tomcat. Tomcat 7 NIO does seem to be supported by the AJP connector: Connector Comparison

Please be advised that Push Server does not support Tomcat NIO. The Enterprise Push Server (EPS) does.

Regards,

Thanks Jack, we are using EPS since we have a license of EE.