[OSM-dev] OSM without segments - prototype

[Steve Coast]

On 20 Aug 2007, at 12:30, Tom Hughes wrote:

> In message <46C975EC.4040400 at bretth.com>
>         Brett Henderson <brett at bretth.com> wrote:
>
>> If API scalability is an issue, the most effective change I can  
>> think of
>> would be to allow a set of changes to be made via a single API  
>> request.
>> This would correspond to a single HTTP request/response each time you
>> hit the update button in JOSM.  This would drastically reduce the  
>> number
>> of request/responses through the web server and *if* we were using a
>> database with full transaction support it would reduce database  
>> load by
>> grouping changes into single transactions.
>
> I'd love to do that, but it has one really horrible problem - what do
> you do if you get halfway through the file and encounter an  
> error... How
> do you roll back the changes you have already made?

Magic.

That's how subversion does it, doesn't it? :-)

have fun,

SteveC | steve at asklater.com | http://www.asklater.com/steve/