----- Original Message -----
From: "Kees Jan Koster" <[EMAIL PROTECTED]>
To: "Tomcat Users List" <users@tomcat.apache.org>
Sent: Monday, October 06, 2008 9:22 PM
Subject: Re: Using tomcat to hold many open connections.
Dear Uprooter,
I'm looking for a server that has to hold many (web services) remote
clients
for controlling them.
I want to do things like sending power off command to a bunch of
machines
remotely.
Building a botnet? :-)
The clients are usually windows machines behind firewalls NAT or web
proxies that only allow HTTP (this is why I thought of webservices)
The regular request-response fashion that servlet follows is not
suitable
here since the initiator of the operation is the server.
What can I do in order to solve this and still use web services?
If you have the resources, you can just block in the servlet on your
server. It's pretty expensive since Tomcat uses a thread per request I
believe. Java threads are expensive (256kB each?), so that adds up
quickly. You could spend some time tuning your thread stacks, though.
Depending on your actual number of clients, you should be able to get
this to work with a few GB of RAM.
But then, 20K client polling once an hour might be cheaper. You may want
to find a way to stagger the requests though.
--
Kees Jan
Yes Kees exactly... this is why I say "engineer it"... these guys find a
hammer, and then everything look like a nail... ha ha
Without more details we cant engineer it... but I do think, web services are
not the right tool, at most an addendum, not the core... and that there are
two distinct processes at work, web side and machine side... they interface
but cant be combined... to do this right, you got to be a good general
coder...
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