[openstack-dev] [heat] upgrade options for custom heat resource plug-ins

Zane Bitter zbitter at redhat.com
Thu Apr 14 17:51:11 UTC 2016

On 11/04/16 14:06, Praveen Yalagandula wrote:
> Hi,
> We are developing a custom heat resource plug-in and wondering about how
> to handle plug-in upgrades. As our product's object model changes with
> new releases, we will need to release updated resource plug-in code too.

So, in the first instance, I would recommend trying very hard not to do 
this. If you can, try to keep a stable interface even if the product 
changes underneath. (You can still add properties, as long as they are 
not required, but don't remove, rename, or otherwise make 
backward-incompatible changes to properties in the resource schema.) 
That said, I realise this is not always possible because of reasons.

> However, the "properties" stored in the heat DB for the existing
> resources, whose definitions have been upgraded, need to be updated too.
> Was there any discussion on this?

I believe this is what you need:


Documentation is unfortunately light on the ground, but you should be 
able to find a few examples in the core resources. Here is the spec:



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