David and anyone else who is interested here's the feature request:
http://code.google.com/p/googleappengine/issues/detail?id=1300

Instead of allowing multiple apps to share one datastore; It appears that 
the App Engine team is planning on giving more control over app versions, 
in the future. I believe this is the Google IO session that discusses it:

http://www.youtube.com/watch?v=zQ5_47zy4bY


-Kyle

On Thursday, July 26, 2012 10:19:12 PM UTC-5, David Hardwick wrote:
>
> Hi 
>
> If you put in a feature request to have two+ apps access the same 
> datastore natively then I will definitely star it!
>
>
> On Thursday, July 26, 2012 3:11:48 PM UTC-4, rerngvit yanggratoke wrote:
>>
>> Hello,
>>        Anyone have an idea on how to achieve a differentiated service 
>> with Google App Engine? I have two types of users. One is premium while 
>> another one is free user. I would like to set different minimum latencies 
>> for firing up new GAE instances between the two. In other words, I am 
>> willing to pay extra for the traffic generated from the premium users. 
>> Nonetheless, for the free users, I would prefer to pay at minimum or within 
>> the daily free quota provided by Google. In my case, I expect that the free 
>> users are able to tolerate higher latency than the premium ones. I believe 
>> that this case should be quite general and apply to many people.
>>        Assuming that I can identify types of users by the URLs they use 
>> or via other mechanisms. The only way I could think of is creating two 
>> separated applications and letting the premium users access the one that 
>> enables billing, while free users access the one that doesn't. However, my 
>> free and premium users need to share the datastore because they are also 
>> have to communicate within the application. Unfortunately, it seems that 
>> sharing a datastore across applications is not possible at the moment (feel 
>> free to correct me if I am wrong). 
>>
>> Any ideas or suggestions?
>>
>> Cheers,
>> Rerngvit
>>
>

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