[openstack-dev] A simple way to improve nova scheduler

Joe Gordon joe.gordon0 at gmail.com
Tue Jul 23 19:56:56 UTC 2013

On Jul 23, 2013 3:44 PM, "Ian Wells" <ijw.ubuntu at cack.org.uk> wrote:
> > * periodic updates can overwhelm things.  Solution: remove unneeded
> > most scheduling data only changes when an instance does some state
> 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

> 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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