[Engine-devel] Ideas about engine clustering?

[plysan]

2013/8/22 Itamar Heim <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
>> >>
>>
>>
>>     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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>>
>>      >
>>
>>
>>
>>
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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?
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