[openstack-dev] [nova] [rfc] drop XML from v3 API entirely

Alex Xu xuhj at linux.vnet.ibm.com
Tue Jan 14 11:20:26 UTC 2014

+1 for drop xml. But if we can't drop it, can we think about use 
XMLDictSerializer instead of XmlTemplate? We spend a lot of time to 
maintain XmlTemplate, and it make xml
format inconsistent(some of resouce's attribute is output as xml 
sub-element, some of them is output as xml element's attribute, no rule 
for them). If we just use XMLDictSerializer for all api, can we just 
test XMLDictSerializer, not all the api?

On 2014年01月13日 22:38, Sean Dague wrote:
> I know we've been here before, but I want to raise this again while 
> there is still time left in icehouse.
> I would like to propose that the Nova v3 API removes the XML payload 
> entirely. It adds complexity to the Nova code, and it requires 
> duplicating all our test resources, because we need to do everything 
> onces for JSON and once for XML. Even worse, the dual payload strategy 
> that nova employed leaked out to a lot of other projects, so they now 
> think maintaining 2 payloads is a good thing (which I would argue it 
> is not).
> As we started talking about reducing tempest concurrency in the gate, 
> I was starting to think a lot about what we could shed that would let 
> us keep up a high level of testing, but bring our overall time back 
> down. The fact that Nova provides an extremely wide testing surface 
> makes this challenging.
> I think it would be a much better situation if the Nova API is a 
> single payload type. The work on the jsonschema validation is also 
> something where I think we could get to a fully discoverable API, 
> which would be huge.
> If we never ship v3 API with XML as stable, we can deprecate it 
> entirely, and let it die with v2 ( probably a year out ).
> -Sean

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