[openstack-dev] About microversion setting to enable nested resource provider

Eric Fried openstack at fried.cc
Thu Sep 13 15:14:07 UTC 2018

There's a patch series in progress for this:


It needs some TLC. I'm sure gibi and tetsuro would welcome some help...


On 09/13/2018 08:31 AM, Naichuan Sun wrote:
> Thank you very much, Jay.
> Is there somewhere I could set microversion(some configure file?), Or just modify the source code to set it?
> BR.
> Naichuan Sun
> -----Original Message-----
> From: Jay Pipes [mailto:jaypipes at gmail.com] 
> Sent: Thursday, September 13, 2018 9:19 PM
> To: Naichuan Sun <naichuan.sun at citrix.com>; OpenStack Development Mailing List (not for usage questions) <openstack-dev at lists.openstack.org>
> Cc: melanie witt <melwittt at gmail.com>; efried at us.ibm.com; Sylvain Bauza <sbauza at redhat.com>
> Subject: Re: About microversion setting to enable nested resource provider
> 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/place
>> ment/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
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