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Hi Denis,

I think this is a perfect time for you to review the spec for the glance metadata catalog https://review.openstack.org/#/c/98554/ and see if it fits your use case.
Also, we have a session tomorrow at 9:00am PST at the Glance meetup to discuss this topic. I think it would be useful if you could join (in person or remotely). Please see the details: https://wiki.openstack.org/wiki/Glance/JunoCycleMeetup

Thank you,
Arnaud

On Jul 24, 2014, at 6:32 AM, Denis Makogon <dmakogon at mirantis.com<mailto:dmakogon at mirantis.com>> wrote:

Hello, Stackers.

     I’d like to discuss the future of Trove metadata API. But first small history info (mostly taken for Trove medata spec, see [1]):
Instance metadata is a feature that has been requested frequently by our users. They need a way to store critical information for their instances and have that be associated with the instance so that it is displayed whenever that instance is listed via the API. This also becomes very usable from a testing perspective when doing integration/ci. We can utilize the metadata to store things like what process created the instance, what the instance is being used for, etc... The design for this feature is modeled heavily on the Nova metadata API with a few tweaks in how it works internally.

    And here comes conflict. Glance devs are working on “Glance Metadata Catalog” feature (see [2]). And as for me, we don’t have to “reinvent the wheel” for Trove. It seems that we would be able
to use Glance API to interact with   Metadata Catalog. And it seems to be redundant to write our own API for metadata CRUD operations.



    From Trove perspective, we need to define a list concrete use cases for metadata usage (eg given goals at [1] are out of scope of Database program, etc.).
>From development and cross-project integration perspective, we need to delegate all development to Glance devs. But we still able to help Glance devs with this feature by taking active part in polishing proposed spec (see [2]).



    Unfortunately, we’re(Trove devs) are on half way to metadata - patch for python-troveclient already merged. So, we need to consider deprecation/reverting of merged and block
merging of proposed ( see [3]) patchsets in favor of Glance Metadata Catalog.


    Thoughts?

[1] https://wiki.openstack.org/wiki/Trove-Instance-Metadata
[2] https://review.openstack.org/#/c/98554/11
[3] https://review.openstack.org/#/c/82123/


Best regards,
Denis Makogon
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