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---
features:
- |
It is now possible to configure multiple *nova-scheduler* workers via the
``[scheduler]workers`` configuration option. By default, the option runs
``ncpu`` workers if using the ``filter_scheduler`` scheduler driver,
otherwise the default is 1.
Since `blueprint placement-claims`_ in Pike, the FilterScheduler
uses the Placement service to create resource allocations (claims)
against a resource provider (i.e. compute node) chosen by the scheduler.
That reduces the risk of scheduling collisions when running multiple
schedulers.
Since other scheduler drivers, like the CachingScheduler, do not
use Placement, it is recommended to set workers=1 (default) for those
other scheduler drivers.
.. _blueprint placement-claims: https://specs.openstack.org/openstack/nova-specs/specs/pike/implemented/placement-claims.html
upgrade:
- |
The new ``[scheduler]workers`` configuration option defaults to ``ncpu``
workers if using the ``filter_scheduler`` scheduler driver. If you are
running *nova-scheduler* on the same host as other services, you may want
to change this default value, or to otherwise account for running other
instances of the *nova-scheduler* service.
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