On 22 September 2014 21:49, Mark McClain <m...@mcclain.xyz> wrote: > Ideally, I think something that provides proper sync support should exist in > Keystone or a Keystone related project vs multiple implementations in > Neutron, Cinder or any other multi-tenant service that wants to provide more > human friendly names for a vendor backend.
In general in cinder I've opposed making unnecessary calls out to *any* REST API, keystone, glance, etc, in any common code path, particularly cinder-api code - it makes it very easy for a blip in one service, like keystone api, to case a cascading failure as the worker threads end up all getting consumed blocking waiting for the external service, then nova blocks all its api threads talking to cinder, neutron blocks talking to nova, cinder volume actions block calling nova, etc. Either you then run into a storm of timed out operations, or a storm of work once the end of the blockage is removed, neither of which is desirable. I'd rather not have convenience labels on the backend array than increase the risks of this sort of failure mode. -- Duncan Thomas _______________________________________________ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
