@Google: App Engine / GData questions

[dflorey]

Hi there,
two quick questions:
- Are there any Google apps (like calendar, contacts etc.) running on
app engine?
- Are there any plans to let GData services participate in a
transaction?

Right now it's almost impossible to create idempotent tasks when using
certain GData services.
Example: When creating a contact I frequently get timeout exceptions
from the Google contact servers, so I have no clue whether a contact
has been created or not. When the task gets executed multiple times
(for whatever reason), I end up with duplicated contacts.

[Ikai L (Google)]

Corporate applications run on App Engine. Here's a session from IO where our Corporate Engineering team discusses their experiences: http://www.youtube.com/watch?v=IzxdL4I0xTg

As for your question about idempotence: There may be, but you'll likely get a better answer for this question from the GData team:

http://groups.google.com/group/google-help-dataapi

Interesting that contact creation isn't idempotent. If it doesn't exist already, for your use case, at least, it could be a good GData feature request to add a UUID to write operations such that after a successful write, writes become invalid for any subsequent call tagged with that UUID.

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Ikai Lan 
Developer Programs Engineer, Google App Engine

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[dflorey]

Thanks a lot for the info. I've moved my question to the GData group.
UUID would be a very good approach, right now I get back the UID back
from the call (or not if it times out...).

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