On 09/13/2018 06:39 AM, Naichuan Sun wrote: > Hi, guys, > > Looks n-rp is disabled by default because microversion matches 1.29 : > https://github.com/openstack/nova/blob/master/nova/api/openstack/placement/handlers/allocation_candidate.py#L252 > > Anyone know how to set the microversion to enable n-rp in placement? It is the client which must send the 1.29+ placement API microversion header to indicate to the placement API server that the client wants to receive nested provider information in the allocation candidates response. Currently, nova-scheduler calls the scheduler reportclient's get_allocation_candidates() method: https://github.com/openstack/nova/blob/0ba34a818414823eda5e693dc2127a534410b5df/nova/scheduler/manager.py#L138 The scheduler reportclient's get_allocation_candidates() method currently passes the 1.25 placement API microversion header: https://github.com/openstack/nova/blob/0ba34a818414823eda5e693dc2127a534410b5df/nova/scheduler/client/report.py#L353 https://github.com/openstack/nova/blob/0ba34a818414823eda5e693dc2127a534410b5df/nova/scheduler/client/report.py#L53 In order to get the nested information returned in the allocation candidates response, that would need to be upped to 1.29. Best, -jay