[Engine-devel] Ideas about engine clustering?

[Itamar Heim]

On 08/21/2013 11:08 AM, plysan wrote:
>
>
>
> 2013/8/21 Laszlo Hornyak <lhornyak at redhat.com <mailto:lhornyak at redhat.com>>
>
>     Hi,
>
>     ----- Original Message -----
>      > From: "plysan" <plysab at gmail.com <mailto:plysab at gmail.com>>
>      > To: engine-devel at ovirt.org <mailto:engine-devel at 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
>     haven't
>      > found anything.
>      >
>      > I know there will be lots of things to do for engine migrating to
>     clustering
>      > 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
>     solve):
>      > 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?