[openstack-dev] [nova][object] One question to the resource tracker session

John Garbutt john at johngarbutt.com
Thu Nov 14 12:34:48 UTC 2013

On 13 November 2013 23:22, Andrew Laski <andrew.laski at rackspace.com> wrote:
> On 11/13/13 at 11:12pm, Jiang, Yunhong wrote:
>> Hi, Dan Smith and all,
>>         I noticed followed statement in 'Icehouse tasks' in
>> https://etherpad.openstack.org/p/IcehouseNovaExtensibleSchedulerMetrics
>>                 convert resource tracker to objects
>>                 make resoruce tracker extensible
>>                 no db migrations ever again!!
>>                 extra specs to cover resources - use a name space
>>         How is it planned to achieve the 'no db migrations ever again'?
>> Even with the object, we still need keep resource information in database.
>> And when new resource type added, we either add a new column to the table.
>> Or it means we merge all resource information into a single column as json
>> string and parse it in the resource tracker object?.
> You're right, it's not really achievable without moving to a schemaless
> persistence model.  I'm fairly certain it was added to be humorous and
> should not be considered an outcome of that session.

But we can avoid most data migrations by adding any required
conversion code into the objects DB layer, once we start using it. But
it might not be what we want.


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