interesting response, (and thanks) Mark! glad you feel that way about clustering (expensive and not worth the hassle), and scaling out the database for expensive queries/searches is definitely what I want, because I really think the tomee+ stack is performing very very well on my fast hardware. sadly, the (one) database for queries+writes (performance) definitely can be improved!
will have to look into scaling out the database. thanks again! On Sun, Oct 20, 2013 at 8:17 AM, Mark Struberg <[email protected]> wrote: > DB replication basically works with the transaction log (IBM DB/2 > terminology, in Oracle it's called transfer tables). Each > update/insert/delete statement gets written into a file and you can pick > this file up from another node. This secondary node then does exactly the > same like the first node. See e.g. Master/Slave setup on MySQL. > Means after a commit, after a few ms the secondary (slave) node has > exactly the same info as the master node. And if the master node fails, > then you can easily fall over to the slave node. > > This can also be very helpful to 'scale out' in case you need performance: > > All write stuff is only performed on the master node, but expensive > queries/searches might be performed on the n replication nodes. Of course > this needs a special handling in your app, but allows to move the expensive > queries away from your primary node. > > All other 'real' cluster solutions are really expensive and most of the > times not worth the hassle imo ;) > > > LieGrue, > strub > > PS: usually clustering of Servlets are done by just 'pairing' up always 2 > different servlet containers (tomcat nodes A+B, C+D) and have full session > replication on them. Means whenever a request is done it will move the > whole session content to the paired node. > With the msm you can get away from this. > > > > ----- Original Message ----- > > From: "Howard W. Smith, Jr." <[email protected]> > > To: MyFaces Discussion <[email protected]> > > Cc: > > Sent: Sunday, 20 October 2013, 12:56 > > Subject: Re: [OT but still JSF]: Clustering, session replication, and > database, too > > > > also, i'm still wondering about how database is replicated while > clustering > > the app. > > > > > > On Sun, Oct 20, 2013 at 5:34 AM, Thomas Andraschko < > > [email protected]> wrote: > > > >> JFYI: > >> MyFaces+OWB on Tomcat with MSM is working fine. > >> > > >
