RE: how to suppor 30000 concurrent users

[Raffi <so...@hotmail.com>]

I always wondered about how high-profile sites like Ebay and Amazon
updated their systems because they never seem to place messages at their
sites regarding system downtime for routine maintainance. In a clustered
app server environment, I'm assuming that each node is downed and
updated individually while the other nodes support user requests, or
perhaps it's done differently. Can you explain, thanks!

Raffi

-----Original Message-----
From: Angus Mezick [mailto:amezick@guidestar.org] 
Sent: Tuesday, August 05, 2003 9:07 AM
To: Tomcat Users List
Subject: RE: how to suppor 30000 concurrent users 


With that many users you are going to HAVE to cluster if for no other
reason than to provide backup for system maintanence.  As to how many,
the answer is it depends on the hardware you are going to use and the
types of load your webapp puts on the system.  When you say 30k
concurrent users do you mean 30k people clicking a link at the same time
or 30k active sessions at a time?  If you are going to have this many
people clicking on the same time you should have the cash to do proper
load testing to see how many people one of your servers can take, divide
30k by that number for the number of servers you have, multiply by 1.1
AT LEAST and round up to get 110% capacity so you should be able to swap
out one server.  This is BARE minimum.  Don't forget about the wonderful
world of DB backends and routers and all the fun stuff :) --Angus

> -----Original Message-----
> From: Heart Prince [mailto:thelastprince@hotmail.com]
> Sent: Tuesday, August 05, 2003 8:57 AM
> To: tomcat-user@jakarta.apache.org
> Subject: how to suppor 30000 concurrent users 
> 
> 
> howmany concurrent users does tomcat support? if i want to
> design a web 
> application for 30,000 concurrent users, what is the step?  
> clustering is 
> related to this? how many servers i need if i am clustering
> 
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