Hi Dexter,
> The global conservation law is a show stopper for many banking type
> application in Google Apps.
> Check http://code.google.com/p/googleappengine/issues/detail?id=313
> for details.
>
> It seems that google is not going to bring 2 row concurrency anytime
> soon. However if a large number of people are interested it might get
> a higher priority.
>
In Java world, Slim3, which is a framework, supports global transactions.
http://sites.google.com/site/slim3appengine/slim3-datastore/transactions/global-transaction
If python SDK supports explicit transactions, global transactions can
be implemented as Slim3.
Explicit transactions means:
DatastoreService ds = DatastoreServiceFactory.getDatastoreService();
Entity entity = new Entity("Aaa");
Entity entity2 = new Entity("Bbb");
Tranaction tx = ds.beginTransaction();
ds.put(tx, entity);
//this operation will execute without transaction
ds.put(null, entity2);
tx.commit();
Thanks,
Yasuo Higa
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