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From Mark Thomas <>
Subject Re: Scalable WebSocket broadcast with Tomcat 7
Date Mon, 03 Jun 2013 08:25:34 GMT
On 02/06/2013 21:12, Dimitri wrote:
> Hi,
> I am developing a collaboration webapp using Tomcat 7 implementation of
> WebSockets. Imagine we have a 1000+ of connected clients, each of them
> having his own WsOutbound. How do we implement broadcast messages in a
> scalable way? Yet I've seen only examples that do iterate over connected
> clients and send messages in a sequential manner. Obviously, this
> approach doesn't scale to hundreds an thousands of clients.
> I've yet come up with a workaround using a fixed ThreadPool executor of
> some 50 threads that do the work in parallel, however, this approach is
> far from perfect, too. I'm wondering if there exists more elegant,
> standard way to do the same, probably employing NIO and multiplexing?

The Tomcat 7 implementation uses blocking IO within a WebSocket frame so
there is no easy way to do what you want to do.

At some point (still TBD) the JSR-356 implementation from Tomcat 8 will
be back-ported to Tomcat 7.


> I've heard that this will be available in JSR-356 out-of-the-box, but
> the application is going to enter production soon, with TomEE 1.6.0 as
> target platform.
> Thanks!
> Dimitri
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