[Openstack] nova-sheduler timeouts in juno ...

Xinyuan Huang huangxy0101 at gmail.com
Sun Feb 8 16:37:51 UTC 2015

Hi Jon,

Could you please also paste the messages in nova scheduler logs, if

It is true that in icehouse instances might get launched individually
before scheduler realizes no enough hosts are available, but currently this
has been changed and number of available hosts are checked before launching


From: Jonathan Proulx <jon at jonproulx.com>
Date: Fri, Feb 6, 2015 at 7:25 AM
Subject: [Openstack] nova-sheduler timeouts in juno ...
To: "openstack at lists.openstack.org" <openstack at lists.openstack.org>
> Hi All,
> After upgrading from icehouse to juno I get timeouts when trying to
> schedule >20 instances at once (20 deterministically works, 30 always
> fails didn't bother to go finer than that)
> Note this is a single call with --max-count on the CLI or setting
> number of instances in Horizon.  If I do parallel batched of 10 or 20
> instances I can get hundreds to launch successfully as each set gets
> handled by a different scheduler process.
> I know under icehouse I could get 100 or so to launch at once (then
> neutron would start to trip over itself, so kudos on that not
> happening anymore).  I seem to recall with icehouse instances in a
> scheduling batch would launch individually as scheduled in juno it
> seems none get launched until all are scheduled.
> In any case timeouts appear in nova-conductor.log one set for each
> instance in the set all with the same message ID
> (http://paste.openstack.org/show/168157/).
> Is anyone else seeing this / know a work around?
> Thanks,
> -Jon
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