[openstack-dev] [nova] Evacuate instance which in server group with affinity policy

Lingxian Kong anlin.kong at gmail.com
Mon Dec 22 01:01:57 UTC 2014

2014-12-19 17:44 GMT+08:00 Alex Xu <soulxu at gmail.com>:
> Hi,
> There is problem when evacuate instance. If the instance is in the server
> group with affinity policy, the instance can't evacuate out the failed
> compute node.
> I know there is soft affinity policy under development, but think of if the
> instance in server group with hard affinity means no way to get it back when
> compute node failed, it's really confuse.
> I guess there should be some people concern that will violate the affinity
> policy. But I think the compute node already down, all the instance in that
> server group are down also, so I think we needn't care about the policy
> anymore.

but what if the compute node is back to normal? There will be
instances in the same server group with affinity policy, but located
in different hosts.

> I wrote up a patch can fix this problem:
> https://review.openstack.org/#/c/135607/
> We have some discussion on the gerrit (Thanks Sylvain for discuss with me),
> but we still not sure we are on the right direction. So I bring this up at
> here.
> Thanks
> Alex
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Lingxian Kong

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