interesting response, Jose', thanks! for some time, I thought that it might be best to have separate server (tomee + @EJB/DTO's + tomcat's jdbc + database) which is/becomes the database tier. I guess I need to learn how to do/make remote calls to EJB server from JSF web layer like you are doing.
i wonder if this is the typical/common/most-recommended-and-preferred solution. hmmm, avoid database replication. i have even seen tomcat committer (mark thomas slideshow/document on people.apache.org) mention that clustering your app should be avoided, if possible (or only used, if necessary). :) On Sun, Oct 20, 2013 at 1:30 AM, José Luis Cetina <maxtorz...@gmail.com>wrote: > I have a early experience with a "mini cluster" 2 servers using tomee + > memcached for session replication+ sticky session but using 1 only server > for database (i mean i dont use db replication). My jsf apps (ear) are > running in this mini cluster everithyng works fine except when i shutdown > tomee for do a re deploy i always see an xhtml parser error. I could never > configure it session replication with tomcat. > > In your web apps just use distributable tag in web.xml and all other are > configuration. You can use memcached to not only session replication even > thougth for savr information of your app and with this you can share > information between your nodes and with this you dont persist information > that could be "transient". > The result is incredible. > > As i sayed i could never configure session replication with tomcat, the > only way i could do it is using memcached session replication. > > I dont know if anybody here have any experience with this. > > Regards Howard. > El 19/10/2013 22:49, "Howard W. Smith, Jr." <smithh032...@gmail.com> > escribió: > > > I had a question or two, since I have been reading "Java Summit - > Pitfalls > > in EE"[1] provided by Mark Struberg while having a discussion on tomee > user > > list. > > > > The following page stated the following: > > > > Page 134 > > Clustering > > > > * We use 'asymmetric clustering' > > * use sticky sessions > > * backup away the session to a memcached after each > > request > > * do not replicate the session over to other nodes! > > * Session-Replication always in node pairs. > > * only restore the session from the memcached if a failover > > happened > > * msm can be integrated into OWB: > > http://code.google.com/p/memcached-session-manager/ > > > > Since it says, 'We use asymmetric clustering' and other suggestions were > > made, I found it appropriate to direct my question(s) to MyFaces 'JSF' > user > > list and committers. > > > > is there some type of blog (or two or three) available that discuss how > to > > properly cluster a tomcat/tomee/openwebbeans/myfaces JSF web app? also, > how > > is the database replicated? I don't ever see database cluster/replication > > discussed by JSF developers; i recently had to search for database > cluster > > and saw 'replication', which is something i have not had to worry about > > since my previous work involved database teams while i was doing > > front-end/GUI software. > > > > now that i am doing java ee and jsf, i would love to know how to do > > database clustering and/or replicating database while clustering JSF > > webapp. Of course, right now, i only have one tomee which references > > 'apache' derby (which is performing well, but I would love to get my feet > > wet and cluster my web app + database). i did search derby's mail list > > archives and i learned about sequioa and HA-JDBC (High-Availability > JDBC). > > > > i was hoping to get an answer from MyFaces 'JSF' users/committers...based > > on their experience. I think someone told me that they use mysql > > (clustering); my preference is still 'apache' derby (smile). please > > remember, i'm wondering if any blogs are available that discuss > clustering > > tomcat (preference = tomee) + JSF web app (with database) + memcached > > session manager. > > > > Thomas has already started writing a blog[2] about this. I'm looking > > forward to seeing sample config for it all (if available). :) > > > > [1] > > > > > http://people.apache.org/~struberg/eesummit2013/Java%20EE%20Summit%20-%20pitfalls%20in%20EE.pdf > > > > [2] > > > > > http://tandraschko.blogspot.com/2013/09/session-replication-clustering-failover.html > > >
