Re: DWR Scalabilty And Early Closing Mode

Joe Walker-3 wrote:

DWR does a lot to protect the server against overloading. In the case of
Websphere, there is no custom plugin for their async servlet, so we fall
back to the servlet-api implementation which backs off connection numbers to
prevent overloading things.

Early closing mode is there to prevent buggy proxies messing with the
responses - it's not about reducing load.

What kind of latencies are important to you? If you're ok with latencies of
> 60 seconds, then you can configure DWR to poll, which should reduce the
server load.

Joe.

On Sun, Mar 16, 2008 at 4:30 PM, r123 <ronberna@hotmail.com> wrote:

>
> We have a project that will run on a Websphere 6.1 server that needs to
> send
> data to the web client in real or near real time.  The data will be read
> from a JMS topic. We are considering using DWR "Reverse AJAX" to help push
> this data from the web server to the web client.  There are some concerns
> about how this would scale as well as failover.  There is also a concern
> about the "push" vs. "pull" concept.
>
> I read some about Early Closing Mode in DWR.  If I understood this
> correctly, DWR will close the http connection after 60 seconds if there is
> no activity.  A question I have is does it release the socket or thread
> once
> that connection is closed?   Would this approach be able to scale to
> thousands of clients or would a dedicated server component like Tibco
> "Ajax
> Messaging Service" which uses LightStreamer be needed in order to handle
> large numbers of clients?  The disadvantage I read about Early Closing
> Mode
> is that many clients may possibly try to re-connect at the same time.  How
> big of an issue is this?
>
> Any ideas on this would be greatly appreciated.
>
> Thanks
> r123
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