Hey Kaan, This is interesting indeed. It's not entirely clear from this description if this is expected behavior or an issue with the platform. As it is however, I believe this post would be better suited as a Defect Report on the App Engine public issue tracker <https://code.google.com/p/googleappengine/issues/entry?template=Defect>. If you file the public issue, I would recommend also providing the following:
- A trimmed down reproduction to speed up the investigation. This is the quickest way to get all the specific details of your models, transactions and handlers interacting with them. - The circumstances under which you encountered this. Knowing the request load, frequency, etc. will help us better understand how easy it is to encounter this behavior. Also, feel free to post a link to the issue here so that readers can follow through if they are also experiencing this issue. Cheers, Nicholas On Thursday, November 3, 2016 at 7:19:44 AM UTC-4, Kaan Soral wrote: > > Hi > > With high retry[60] ndb transactions, I'm getting 2 contention exceptions > (2 consecutive "TransactionFailedError(too much contention on these > datastore entities..." logs), on the third retry, the get routine returns > None instead of the entity, and the routine fails with an exception trying > to access a property of None > > Is this expected? > > It's highly unexpected to me > > As an additional info, it's an "XG" transaction, the "None" entity is the > second entity that's fetched after an exception is logged for the first > entity > -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/google-appengine. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/c33d2406-9aae-4117-870f-e0b87a009999%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
