The strength of GAE is to handle many simultaneous requests (scalability).
If they only read objects then there is absolutely no lock problem.
If multiple requests want to write-to/update a single
object/entity-group you can get collisions. They are resolved by
executing your code in a transaction.

http://code.google.com/appengine/docs/python/datastore/transactions.html

2009/1/30 arnie <parvez...@rediffmail.com>:
> If multiple iphone users are accessing the wsgi app in about same
> time, will GAE manage this? Or does there will occur any lock
> problems?

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