[Engine-devel] Ideas about engine clustering?

[Itamar Heim]

On 08/21/2013 10:27 PM, plysan wrote:
>
>
>
> 2013/8/22 Itamar Heim <iheim at redhat.com <mailto:iheim at redhat.com>>
>
>     On 08/21/2013 11:08 AM, plysan wrote:
>
>
>
>
>         2013/8/21 Laszlo Hornyak <lhornyak at redhat.com
>         <mailto:lhornyak at redhat.com> <mailto:lhornyak at redhat.com
>         <mailto:lhornyak at redhat.com>>>
>
>
>              Hi,
>
>              ----- Original Message -----
>               > From: "plysan" <plysab at gmail.com
>         <mailto:plysab at gmail.com> <mailto:plysab at gmail.com
>         <mailto:plysab at gmail.com>>>
>               > To: engine-devel at ovirt.org
>         <mailto:engine-devel at ovirt.org> <mailto: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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>               >
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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?

active/passive failover you should get from hosted-engine (yes, with 
some downtime)
scalability and active-active would be great. iirc, juan looked at 
implications of doing this a while back