Re: [netmod] [Teas] Key collision between configured and ephemeral list entries

[Juergen Schoenwaelder <[e-mail]>]

On Tue, Jun 11, 2019 at 04:36:08PM +0000, Italo Busi wrote:
> 
> I agree with your statements as long as we consider two sources for the same information/instance. In this case, my understanding is that the same key value is intentionally assigned by the two sources to indicate that they are representing the same information/instance and only one instance needs to be applied within the operational DS
>
> The issue we are trying to solve is slightly different. We have two different instances from different sources and both of them need to be applied within the operational DS, but unfortunately they have got assigned the same key value ...
>

It does not really matter whether the name clash is intentional or
not. Only one can be used and it should be clear which one will be
the winner.

I do understand that you want to design the models so that name
clashes can be avoided and this is likely fine for what you need but
you need to think through all cases.

- Will names not matching the pattern be rejected? If so, what happens
  to existing entries if the allowed name pattern is changed? Or is
  the pattern cast into stone?

- Another option, in principle, is to suggest that names are chosen
  such that they have a low probability to collide. This sometimes
  leads to simpler implementations since clients do not have to
  generate names conforming to some (configurable?) patterns and
  instead create a name with low collision probability and if the
  config does not make it into <operational>, the client handles the
  name clash. Note that some clients may want to tag their entries
  with specific IDs anyway so that they can easily recognize their
  entries, i.e., clients may have other good reasons to avoid
  generating names that have a high probability to clash.

/js

-- 
Juergen Schoenwaelder           Jacobs University Bremen gGmbH
Phone: [phone]         Campus Ring 1 | 28759 Bremen | Germany
Fax:   [phone]         <https://www.jacobs-university.de/>