Hi all --
To add to Dave' questions, I would also be very much interested in the way
people have tackled this problem.
I havent played around with how webserver load balancing works (I am not
sure about the word they use for that - routing ??) But I would like to know
if anyone has tried that ? What are my options - software/hardware ??
If the requests can be spread across multiple webservers, to maintain state,
requests from a user need to be routed to the same webserver the next time.
Can this be achieved by webservers themselves ? Its like some session info
maintained in the webserver. If yes, then one can continue with one
webserver <--> one servlet engine combination.
If not, how do I associate a user to the particular instance of servlet
engine ? Is there any inbuilt support for this in any of the servlet engines
?
Writing my own session management servlet and routing servlet would be the
last thing I would like to do ...
Thanks for any inputs ...
Shashank
>From: David Mossakowski <[EMAIL PROTECTED]>
>More specifically now,
>
>I have noted two possible set ups:
>
>1. Simpler round-robin algorithm to choose web server at the DNS level
>and then have the web server load balance (with session awareness) to
>servlet engines as it seems to be the case with Apache.
>
>2. Have DNS itself be session aware (3-DNS from F5) and load balance to
>HTTP server which would have only one instance of servlet engine.
>
>I guess it comes down to: should one web server have many instances of
>servlet engine on it? It seems that it is a good idea since it will
>take much less for the HTTP server to relay request to servlet engines
>and then send back a ready-made reply. It would seem a waste to have
>just one servlet engine instance on one HTTP server. Is this assumption
>correct?
>
>It seems that the Apache way is better. In the second approach if DNS
>is session aware then it would send request to a given web server and
>the web server would again have to check the session ID to direct the
>request to correct instance of the servlet engine?
>
>Am I making sense here? Are there other setups? Can someone who has
>done this share their knowledge?
>
>dave.
>
>--
>David Mossakowski _||_ e-mail: [EMAIL PROTECTED]
>Instinet Corporation __||||_|_||__||_ tel: 212.310.7275
>Programmer __||||__||_|||__|||||_|__ fax: 212.583.7780
>
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>
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