Re: [Ppm] Batch selection and use cases for DAP

[Christopher Patton <[e-mail]>]

Hi Simon (please forgive the rate reply!)

Not the answer to your questions (a) or (b) but another question:
>
> We are assuming that correctness of results requires
> all-honest-aggregators but privacy is protected by a
> single-honest-aggregator.
> So, could report selection be simplified by reducing the scope to the
> interaction between Collector and Leader?
> I.e., the leader would select reports based on what the collector wants to
> achieve and the aggregators only have to check the privacy criteria, so
> currently, min_batch_size and max_batch_lifetime.
>

That's a really good idea. The Collector picks the batch selector, and the
Leader uses the batch selector to pick the set of reports to put in the
batch. There's no reason the collector needs to know anything about the
selector beyond that it preserves the intended privacy goal. Perhaps you'd
like to take a shot at sketching how this would work?

Chris P.