software-store-developers team mailing list archive

[Matthew Paul Thomas <mpt@xxxxxxxxxxxxx>]

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Aaron Peachey wrote on 23/06/11 12:11:
>...
> We need to make changes to the server for this, and my thoughts about
> how we approach this have come up with a few options.
> 
> Option 1: maintain a field against each app on the server with the
> current ELR number. This would mean every time someone submits,
> modifies, deletes or hides a rating for that app, the server would
> need to re-calc the ELR at the time.
> The benefit of this is we can simply return the ELR to the client
> whenever the client asks for ratings. Because we often ask for alot of
> these in one hit (e.g. updates last X days) this would be a benefit
> performance wise where it counts.
> However, it would come at the cost of some time for every action that
> affects ratings for the app, because we need to re-calc every time.

Another minor benefit: If we made changes to the formula, we wouldn't
need to issue an update to USC, we could just change it on the server.

> Option 2: maintain 5 fields against each app on the server, with the
> total ratings for each step. This would be a much simpler calculation
> at the time of submit/delete/modify/hide but a performance hit upon
> retrieval of ratings in a bulk fashion because somewhere we need to do
> the ELR calc for every app that has changes in ratings
> This could either be done by calculating the ELR on the server before
> returning it or just returning the 5 integers* and having the client
> work out the ELR.
>...
> *We need to keep in mind, that if we go down the path of showing a
> distribution of ratings for each package, then we will probably need
> the 5 integers to be returned to the client in order to work out the
> distribution. With this in mind, I'd suggest we need to go with option
> 2 and have the server return the 5 integers to the client, who then
> uses them to calculate the ELR and work out the distribution of
> ratings for display.
>...

I agree, I'd like to show the distribution of ratings as some sort of
histogram. (You can see some preliminary sketches for this at
<https://wiki.ubuntu.com/SoftwareCenter?action=AttachFile&do=view&target=p58-small.png>.)

Cheers
- -- 
mpt
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