Prashant Jaiswal wrote:
> Has anybody tried Load Balancing in any of the available popular EJB
> Servers (WebLogic/PowerTier)?
Yes, with WebLogic. Not with PowerTier, however. WebLogic's load
balancing works pretty well.
> Or should I say how the load balancing is achieved in EJB?
WebLogic achieves load balancing via an NSAPI proxy (for a Netscape
web server) or an ISAPI proxy (for an IIS web server). The proxy
redirects the request to one of the WebLogic app servers in the
cluster. There may be other methods that WebLogic uses for load
balancing, but this is the one I'm familiar with.
The proxy load balances between servers using one of three
algorithms - round robin, random, or weighted random. Round robin
just takes turns with each app server in turn. Random is - well,
randomly distributed, and weighted random allows each app server to
be assigned a weighting value so that some servers will get more
requests than others.
I have heard about other more sophisticated load balancing
algorithms that check the current loading of each server and assign
requests based on the server that can best handle it. I don't know
which, if any, servers employ algorithms such as this.
Paul
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