Every GeneralCounterShard is an entity group.
A transaction can only operate on ONE entity group.
Your transaction code accesses every GeneralCounterShard for a given name.
With sharded counters you NEVER have a perfect value for the total count.
The value for get_count() <= Sum(shards)
You use shards because you have object-lock possibilities.
Maybe this will work (using the function names from the article [1])
Be aware that at maintenance moments memcache is not working.
def get_count_and_increment(name):
count = get_count(name)
increment(name)
return count+1
[1] http://code.google.com/appengine/articles/sharding_counters.html
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