Open Stack

Just some added info for that talk, we are using qpid as our messaging
backend. I have no data for RabbitMQ, but our schedulers are _always_
behind on processing updates. It may be different with rabbit.

-Mike


On Tue, Jul 23, 2013 at 1:56 PM, Joe Gordon <joe.gordon0 at gmail.com> wrote:

>
> On Jul 23, 2013 3:44 PM, "Ian Wells" <ijw.ubuntu at cack.org.uk> wrote:
> >
> > > * periodic updates can overwhelm things.  Solution: remove unneeded
> updates,
> > > most scheduling data only changes when an instance does some state
> change.
> >
> > It's not clear that periodic updates do overwhelm things, though.
> > Boris ran the tests.  Apparently 10k nodes updating once a minute
> > extend the read query by ~10% (the main problem being the read query
> > is abysmal in the first place).  I don't know how much of the rest of
> > the infrastructure was involved in his test, though (RabbitMQ,
> > Conductor).
>
> A great openstack at scale talk, that covers the scheduler
> http://www.bluehost.com/blog/bluehost/bluehost-presents-operational-case-study-at-openstack-summit-2111
>
> >
> > There are reasonably solid reasons why we would want an alternative to
> > the DB backend, but I'm not sure the update rate is one of them.   If
> > we were going for an alternative the obvious candidate to my mind
> > would be something like ZooKeeper (particularly since in some setups
> > it's already a channel between the compute hosts and the control
> > server).
> > --
> > Ian.
> >
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>
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