Hi Lucas,
  Entity groups are not related to the class name; entity groups are
related to the entity key.  They are formed by specifying a 'parent'
when creating an entity (or an entity key).

  
http://code.google.com/appengine/docs/python/datastore/entities.html#Entity_Groups_and_Ancestor_Paths


Robert






On Mon, Mar 7, 2011 at 05:29, Lucas <[email protected]> wrote:
> I saw example http://code.google.com/appengine/articles/sharding_counters.html
> . the sharded counter use one entity group and store multiple counting
> records in few records in same Counter.class.  Aren't there is limit
> of number of write can be done on same entity group? since this is
> only one entity group, will there be write contention when the
> incrementing the counter too fast?
>
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