Your two "quick notes" seem to be contradictory. In order to use transactions, don't all of the entities have to be in the same entity group?
Vince On Fri, Sep 4, 2009 at 8:24 PM, Jason (Google)<apija...@google.com> wrote: > Batch puts are supported, yes, and as of yesterday's release, calling > makePersistentAll (JDO) and the equivalent JPA call will take advantage of > this support (previously, you had to use the low-level API). > > Two quick notes: > > 1) All of the entities that you're persisting should be in separate entity > groups since two entities in the same entity group can't be written to > consecutively, and you will see datastore timeout exceptions if many > simultaneous write requests come in for the same entity or entity group. > 2) Batch puts do not operate in a transaction. This means that some writes > may succeed but others may not, so if you need the ability to rollback, > you'll need transactions. > > - Jason > > Let me know if you have any more questions on this. > > - Jason > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-java@googlegroups.com To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en -~----------~----~----~----~------~----~------~--~---
