Re: DWR Scalabilty And Early Closing Mode

by Joe Walker-3 :: Rate this Message:

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@...> 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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