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Arbitrary blobs are a powerful tools to circumvent limitations of an API,
as well as other constraints which might be imposed for versioning or
portability purposes.
The parameters that should end up in such blob are typically specific for
the target IPAM driver (to an extent they might even identify a specific
driver to use), and therefore an API consumer who knows what backend is
performing IPAM can surely leverage it.

Therefore this would make a lot of sense, assuming API portability and not
leaking backend details are not a concern.
The Neutron team API & DB lieutenants will be able to provide more input on
this regard.

In this case other approaches such as a vendor specific extension are not a
solution - assuming your granularity level is the allocation pool; indeed
allocation pools are not first-class neutron resources, and it is not
therefore possible to have APIs which associate vendor specific properties
to allocation pools.

Salvatore

On 4 November 2015 at 21:46, Shraddha Pandhe <spandhe.openstack at gmail.com>
wrote:

> Hi folks,
>
> I have a small question/suggestion about IPAM.
>
> With IPAM, we are allowing users to have their own IPAM drivers so that
> they can manage IP allocation. The problem is, the new ipam tables in the
> database have the same columns as the old tables. So, as a user, if I want
> to have my own logic for ip allocation, I can't actually get any help from
> the database. Whereas, if we had an arbitrary json blob in the ipam tables,
> I could put any useful information/tags there, that can help me for
> allocation.
>
> Does this make sense?
>
> e.g. If I want to create multiple allocation pools in a subnet and use
> them for different purposes, I would need some sort of tag for each
> allocation pool for identification. Right now, there is no scope for doing
> something like that.
>
> Any thoughts? If there are any other way to solve the problem, please let
> me know
>
>
>
>
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