If you are using auto generated keys or keys generated using the
allocateIds() method, no, this should never happen. In fact, any key
created using allocateId will never appear again even if you never save an
entity with that key.
One thing to note is that that IDs are not monotonically incrementing (ID
1, 2, 3, 4, 5 ... etc) - this is very hard to do in a scalable fashion. IDs
more or less are increasing, but we cannot guarantee that the ID of an
entity will be greater than an entity saved before it (you might
concurrently allocate two batches of IDs, for instance).
--
Ikai Lan
Developer Programs Engineer, Google App Engine
plus.ikailan.com | twitter.com/ikai
On Thu, Dec 15, 2011 at 8:59 AM, Juna juan.meng...@bcntouch.com wrote:
Hi, I have been looking info about this and I haven't find an exact answer
(or I haven't known read the answer).
I am imagining a paranoic scenario where I delete an entity of certain
kind and at some point in the future I create another entity of the same
kind which receives the same key value.
In this case my app relies in the datastore to generate the keys, I am not
generating my own keys.
I supose that an asteroid will hit my house before this issue happens, but
I am curious.
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