Hi Richard,
>
> I have a question:
> I see there is a get(Iterable<Key> keys), that only returns entities
> that exist (i.e. doesn't throw an exception when an entity isn't
> found).  This looks like it could be really useful, e.g. as an IN
> query.  Is there a 'reasonable' maximum to the amount of keys you can
> put in?  E.g. 20, 100, 500?
>
The maximum number of entities in a batch put or batch delete is 500.
The maximum number of entities in a batch get is 1000.

See the following document:
http://code.google.com/appengine/docs/java/datastore/overview.html#Quotas_and_Limits

Hope this helps,

Yasuo Higa

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