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From Niki Dokovski <nick...@gmail.com>
Subject Re: any known problems using Tomcat 7.0.42 apr/native (windows) with websockets?
Date Tue, 06 Aug 2013 13:05:21 GMT
On Tue, Aug 6, 2013 at 3:20 PM, Bob DeRemer <bob.deremer@thingworx.com>wrote:

>
>
> > -----Original Message-----
> > From: Mark Thomas [mailto:markt@apache.org]
> > Sent: Tuesday, August 06, 2013 3:56 AM
> > To: Tomcat Users List
> > Subject: Re: any known problems using Tomcat 7.0.42 apr/native (windows)
> > with websockets?
> >
> > On 06/08/2013 03:45, Bob DeRemer wrote:
> > > QUESTION
> > >
> > > Is anyone aware of any problems using the apr/native connector +
> > > websockets in Tomcat 7.0.42?
> >
> > I'm not aware of any reports.
> >
> > > BACKGROUND
> > >
> > > We are trying to see how many concurrent websocket connections Tomcat
> > > will handle running on Windows Server.   We wrote a multi-threaded java
> > > console app that spins up a thread-per simulated websocket client.  In
> > > each thread, we are using a separate Ning websocket client.
> > > Unfortunately, we can't connect more than a few connections before we
> > > start getting websocket errors.
> >
> > What sort of errors?
>
> I believe the connection was being closed unexpectedly
>

> >
> > > If we change the connector to use NIO, the sporadic connection errors
> > > seem to go away, but then we find that after about 200 connections,
> > > the communication seems to hang.  This happens if all connections are
> > > made from a single test client instance or spread across multiple
> > > client instances.
> >
> > That suggests at least some issue with APR/native and WebSocket.
> >
> > > We're trying to determine where the problem lies and if it's in our
> > > use of Ning in a multi-threaded client app, Tomcat connector
> > > configuration, use of Tomcat websockets on Windows or something else.
> >
> > The focus in Tomcat 7 is going to move to the JSR356 implementation
> pretty
> > soon. I'd suggest looking at that rather than putting effort into Tomcat
> 7's
> > current implementation.
>
> Are there any examples for what must be written server-side?
> Also, is there a version of Tomcat (7 or 8) that has this functionality
> available to test against?
>
> >
> > > If anyone has any suggestions, I would greatly appreciate it.  If you
> > > need additional information, please don't hesitate to ask.
> >
> > I'll look into adding a concurrent client test to the Tomcat unit tests.
> >
>

Here https://nickytd@bitbucket.org/nickytd/websocket-echo-client.git is
what I used for some of the tests for Tomcat 8. It's more a stress than
load but still.

Nikolai Dokovski


> Mark
> >
>
> Bob
> >
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