[Engine-devel] Ideas about engine clustering?
Liran Zelkha
liran.zelkha at gmail.com
Wed Aug 28 13:19:32 UTC 2013
I've added a wiki page on Engine HA.
http://www.ovirt.org/Features/Engine_High_Availability
Please add your comments, we'll try to make this an ongoing effort.
On Sat, Aug 24, 2013 at 3:25 PM, Liran Zelkha <liran.zelkha at gmail.com>wrote:
> IMHO EJB clustering is not the direction we should take, especially
> considering our IoC plans (see http://gerrit.ovirt.org/#/c/5575/).
> QuartzScheduler can be easily fixed by using a DB for Quartz
> configuration. We had such a discussion a few weeks ago.
> mod_jk is probably better for our HA.
> Postgres clustering should probably be a different task, as it's more
> infra and less code.
>
> Another thing to consider is locking, currently done using synchronized,
> and will need to be changed somehow (probably using Infinispan).
>
> On Aug 22, 2013, at 10:22 AM, Itamar Heim wrote:
>
> On 08/21/2013 10:27 PM, plysan wrote:
>
>
>
>
> 2013/8/22 Itamar Heim <iheim at redhat.com <mailto:iheim at redhat.com<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 <lhornyak at redhat.com>> <
> mailto:lhornyak at redhat.com <lhornyak at redhat.com>
>
> <mailto:lhornyak at redhat.com <lhornyak at redhat.com>>>>
>
>
>
> Hi,
>
>
> ----- Original Message -----
>
> > From: "plysan" <plysab at gmail.com
>
> <mailto:plysab at gmail.com <plysab at gmail.com>> <
> mailto:plysab at gmail.com <plysab at gmail.com>
>
> <mailto:plysab at gmail.com <plysab at gmail.com>>>>
>
> > To: engine-devel at ovirt.org
>
> <mailto:engine-devel at ovirt.org <engine-devel at ovirt.org>> <
> mailto:engine-devel at ovirt.org <engine-devel at ovirt.org>
>
> <mailto:engine-devel at ovirt.org <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!
>
> >
>
> > _________________________________________________
>
> > Engine-devel mailing list
>
> > Engine-devel at ovirt.org <mailto:Engine-devel at ovirt.org<Engine-devel at ovirt.org>
> >
>
> <mailto:Engine-devel at ovirt.org <Engine-devel at ovirt.org> <
> mailto:Engine-devel at ovirt.org <Engine-devel at ovirt.org>>__>
>
> > http://lists.ovirt.org/__mailman/listinfo/engine-devel
>
> <http://lists.ovirt.org/mailman/listinfo/engine-devel>
>
>
> >
>
>
>
>
>
> _________________________________________________
>
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>
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> >
>
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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
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