"Dan Kalowsky" <[EMAIL PROTECTED]> wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > On Wed, 5 Jun 2002, John Lim wrote: > > Say you are Amazon or some similar company and has a fancy cluster for order > > processing. As orders come in, the cluster cannot handle the peak load, so > > we need to queue the orders using some such technology until the cluster can > > process them. These queues are actually mini-databases as they often support > > saving to disk, replication, commit-rollback etc. without the overhead of > > relational databases (though you can implement it with relational db > > technology). > > Maybe I'm misunderstanding this, but this queing idea seems rather silly. > If the cluster is unable to handle the load, how do you expect your > webserver to write a temp database? This kind of idea would have to be > handled/implemented at a switch or router level I'd think, and thats > REALLY not where PHP is :)
If the cluster cannot handle the load, then the queues will just get longer and longer. It's interesting that mlwmohawk asked about this because msession is a lightweight session handler without rdbms overhead. Similarly queuing is used instead of a real database for the same reasons - lightweight without rdbms overhead so it scales better. So if the cluster would fail talking to a real rdbms, it will work and scale better using queuing, a more light-weight technology (no need for indexes, joins, etc - just push and pop). I have a reference here which is not the exactly the same as the above one I gave, but you should get the idea: http://www-3.ibm.com/e-business/doc/content/casestudy/43886.html > > >---------------------------------------------------------------< > Dan Kalowsky "The record shows, I took the blows. > http://www.deadmime.org/~dank And did it my way." > [EMAIL PROTECTED] - "My Way", Frank Sinatra > [EMAIL PROTECTED] > -- PHP Development Mailing List <http://www.php.net/> To unsubscribe, visit: http://www.php.net/unsub.php
