On Fri, January 27, 2006 4:30 am, David Delbecq said: > Hello, > > I think i read (probably on tomcat mailing list), that clustering should > ensure (in specs) that a session is not spread across cluster (once > session > is started, user always speak with same jvm which started the session).
That's interesting... anyone know for sure if that is ensured by the spec? I could see a vendor saying they will ensure it, but I'm not certain if the spec ensures it. However, consider failover scenarios... in that case, you would absolutely want the session to have been replicated, otherwise it wouldn't work. For this reason, I'm not sure if the spec would want to say something that was contrary to that. Also, simple load balancing (in the absence of hardware load balancing) would run contrary to the spec. But the bottom-line is I don't know if the spec ensures it or not... anyone else? > But with performances issues, a simulation is a good idea to know if you > might > get affected or not! That's an excellent point. I've never honestly done such a simulation, I always took IBM's advice and followed it... even if it turned out to not be valid any more, I don't see where it'd be a bad thing anyway... I remember years ago when using session *at all* was frowned upon (I was in the MS world at the time). This got me into the habit of writing my apps to use very little session all the time, and it's never felt like a huge constraint, and maybe it has saved me some headaches that I otherwise might have had. But I never actually verified through tests that the advice was valid. Frank > Le Vendredi 27 Janvier 2006 10:00, starki78 a écrit : >> Ciao, >> >> I was it who received the answer, well I didn't find >> this performance gap then the session object contained >> for a short time >1MB but I didn't test it in a distributed environment. >> A session-scoped Acion Form shouldn't harm the performance. >> I cannot immagine. >> >> Nice greetings >> >> >> ---------- Initial Header ----------- >> >> >From : "Lixin Chu" [EMAIL PROTECTED] >> To : "Struts Users Mailing List" user@struts.apache.org >> Cc : >> Date : Fri, 27 Jan 2006 08:11:05 +0800 >> Subject : data in session affecting performance ? >> >> >> >> >> >> >> >> > Hi, >> > I saw a thread discussing this but can not find it anymore now. I >> remember >> > someone mentioned that the amount of data put into the session context >> > should not exceed 32KB in general otherwise performance might be >> affected. >> > >> > I may interpreted it wrongly. so i would like to clarify if it is >> indeed > the >> > case and does this also means that a session scoped ActionForm is >> really > bad >> > in terms of performance ? >> > >> > thanks >> > lixin >> > >> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: [EMAIL PROTECTED] >> For additional commands, e-mail: [EMAIL PROTECTED] >> >> > > -- > David Delbecq > Royal Meteorological Institute of Belgium > > - > Pingouins dans les champs, hiver méchant > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
