Adam, My rant about load balancing and cookies was intended to be a point in the case against session state on the server. I just got carried away, and din't get my point across very well :-)
I've never used Terracotta, but have heard of one project using it, and they're quite happy with it. Probably about time to kill off this thread now? Kyrre --- Adam Taft <[EMAIL PROTECTED]> wrote: > > You should check out Terracotta. > http://www.terracotta.org/ It does > shared cross-JVM memory management pretty > seamlessly. It's open source. > > Being the good REST programmer that I am :), I don't > keep session state > on the server. But, if I had to do it, they have a > really slick way to > manage shared memory across JVMs. I saw a demo of > their stuff at a JUG > meeting once. They demoed a shared Swing > TableModel. Very interesting > and exciting stuff. > > Adam > > > Kyrre Kristiansen wrote: > > Yes, you are right. > > > > You really have two options for this, > > > > 1. Use the database. This might not be a good > solution > > for short-length, time-based session data. > > 2. Use some sort of cluster-sharing, eg memcached > > (which is C++, but I believe there's a > Java-version > > for it as well), or other solutions. > > > > 3. Don't share sessions in the cluster, which > means > > that you have to route the same client to the same > > server throughtout the session. This is usually > done > > by cookies from the load-balancer (yet more > cookies). > > > > There's a second way to make sure that the same > > requests come to the same server, but it's based > on > > IP. Most large cooperations use NAT-style routing > out, > > so that the load-balancer will only see one IP for > up > > to thousands of users, which will give uneven load > on > > the servers. Avoid this balancing scheme like the > > plague. > > > > > > Regards, > > Kyrre > > --- Marc Portier <[EMAIL PROTECTED]> wrote: > > > >> > >> Kyrre Kristiansen wrote: > >>> simple round-robin of a cookie-less system. And, > >> if > >>> you want to make quick, highly reliable > services, > >> load > >>> balancing is almost as king as cache... > >>> > >> Kyrre, thx for pointing me to this, > >> > >> I read this as the intrinsic point that > >> 'resource-state' should be > >> shared in the server-cluster in some way... > >> > >> > >> Anyway, thx all for your comments on the thread, > >> sorry for not finding > >> the time earlier to participate after starting > it... > >> > >> have to give it some time to sip through, now... > >> > >> > >> regards, > >> -marc= > >> > > > > > > > ------------------------------------------------------------ > > Kyrre Kristiansen > > > > > > > ___________________________________________________________ > > > Want ideas for reducing your carbon footprint? > Visit Yahoo! For Good > http://uk.promotions.yahoo.com/forgood/environment.html > ------------------------------------------------------------ Kyrre Kristiansen ___________________________________________________________ Yahoo! Answers - Got a question? Someone out there knows the answer. Try it now. http://uk.answers.yahoo.com/
