[openstack-dev] [nova]Discussion of the inconsistency between api and backend compute driver limitations.

guohliu guohliu at linux.vnet.ibm.com
Mon Jul 15 02:13:08 UTC 2013


On 07/08/2013 09:56 PM, Joe Gordon wrote:
>
>
> On Jul 3, 2013 12:44 PM, "guohliu" <guohliu at linux.vnet.ibm.com 
> <mailto:guohliu at linux.vnet.ibm.com>> wrote:
> >
> > Hello,
> >
> > As we know, nova have different compute drivers with different 
> limitations, you can see in this link,
> >
> > https://wiki.openstack.org/wiki/HypervisorSupportMatrix
> >
> > but the api doesn't reflect that, which means when the user performs 
> some operations via APIs, user can not get well defined message of the 
> limitations, most likely just get error status. I am thinking this 
> problem for a while and feeling a limitation filter might be needed in 
> current api design to filter those limitations and directly return 
> well defined message, I apologize if this problem has been already 
> discussed but I missed it, looking forward to your comments.
>
> Can you give an example?  Why not just update the current error 
> messages to be well defined?
>

Well, lot's of example, like resize from big flavor to small flavor, 
currently different driver has different behaviour, hyper-v will check 
and just throw a exception, libvert powervm etc, after check just use 
the big flavor to perform resize.
>
> >
> > Best Regards
> >
> > guohliu
> >
> >
> >
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>
>
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