Saving using now() and not

[Eurig Jones]

Hey,

I'm using a TaskQueue to save about a 100 entities per task.

Currently using the now() method to do this. If I were to asynchronously save without now() to speed up the process, what would happen exactly if there was a problem with persisting?

Thanks

[Mat Jaggard]

If you don't do the now() it's done by GAE at the end of the request. So the speed is no different for requests that only do one save or that send all the requests first and then do the now() on all the Future's.

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[Eurig Jones]

Ok. I thought it was done asynchronously on another thread. So it's still done synchronously, but just at the end of a request.

The documentation states that it is done asynchronously so I was thinking it would be done on another thread.

Thanks

On Tuesday, 30 April 2013 00:26:08 UTC+3, Mat Jaggard wrote:

If you don't do the now() it's done by GAE at the end of the request. So the speed is no different for requests that only do one save or that send all the requests first and then do the now() on all the Future's.

Hey,

I'm using a TaskQueue to save about a 100 entities per task.

Currently using the now() method to do this. If I were to asynchronously save without now() to speed up the process, what would happen exactly if there was a problem with persisting?

Thanks

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[Jeff Schnitzer]

For all we know, it might be done on another thread. It's either that or the RPC uses NIO. The implementation is hidden behind the ApiProxy and not known outside of google.

Nevertheless, all async operations are completed at the end of a request. Furthermore, all async datastore operations started in a transaction are completed at the end of that transaction.

Jeff

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