2013/8/22 Itamar Heim <iheim@redhat.com>
On 08/21/2013 11:08 AM, plysan wrote:

2013/8/21 Laszlo Hornyak <lhornyak@redhat.com <mailto:lhornyak@redhat.com>>


    ----- Original Message -----
     > From: "plysan" <plysab@gmail.com <mailto:plysab@gmail.com>>
     > To: engine-devel@ovirt.org <mailto:engine-devel@ovirt.org>
     > Sent: Wednesday, August 21, 2013 3:49:31 PM
     > Subject: [Engine-devel] Ideas about engine clustering?
     > Hello, guys:
     > I'm trying to make a jboss clustering environment for engine. But
    felt the
     > difficuty too.
     > So I want to know if any one is working on this? I googled it and
     > found anything.
     > I know there will be lots of things to do for engine migrating to
     > environment. I just want to know what problem need to be solved?
     > I would like to list the things I think that is needed to do(or
     > 1. run jboss in standalone-ha mode or domain mode.
     > 2. add @Clustered annotation to each EJB, I think this will solve the
     > replication problem in cluster, probably lots of details in it.
     > 3. QuartzScheduler problem, only one node running a scheduler is
    enough at a
     > time instead of each node running one.
     > 4. use mod_cluster to handle load balancing.
     > 5. postgresql clustering.

    For failover it sounds like a plan, just wondering if this could
    solve load balancing problems as well.
    Ovirt is generating a big load on the DB and I would be really
    interested if SQL DB clustering could solve the issues.
    It would be great if it could, big part of the scalablity issue is
    the evil things we did against that poor database.

     > 6. There should be more, but hope anyone can think about it :D

    There are tons of data structures that are used in oVirt that store
    state. You will have to hunt all of these down and replace with a
    data structure that is shared between the cluster memebers. This may
    be a big lot of work from many parts of the application.

Indeed, and like Yair Zaslavsky said, we can put the data structure in
infinispan cache, but clustered EJB can do the same thing for us, right?
If all those state values are inside EJBs. (iirc)**

     > Any ideas?
     > Thanks!
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unless you need the load balancing, just for HA, hosted-engine should cover your needs?
I think failover and more scalability  is what i am interested here. Just thinking about the possibilities :)
Imagine engine would never get restarted from outside view. Cool isn't it?