I think the answer (and more) is here :
http://blog.notdot.net/2009/9/Efficient-model-memcaching

On Feb 4, 10:43 am, Nickolas Daskalou <[email protected]> wrote:
> Is it better/safer to store a Model instance into Memcache directly (Method
> 1 below), or should we convert it to a protocol buffer first, then store it
> (Method 2 below)?
>
> Method 1:
>
> memcache.set(cache_key, entity)
> ...
> entity = memcache.get(cache_key)
>
> Method 2:
>
> memcache.set(cache_key, db.model_to_protobuf(entity))
> ...
> entity = db.protobuf_to_model(memcache.get(cache_key))
>
> I'm assuming Method 2 results in a smaller Memcache footprint, yes?
>
> Nick

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