I tried doing a "bulk" load with the JDO makePersistentAll(..) call yesterday ...
by default what I did was created a List of size 2048, filled it to capacity and then called makePersistentAll() ... I got an IllegalArgumentException out of that call stating that you could only persist at most 500 objects per call ... I was unable to retest this, because despite making a change to the capacity of the the List to 500 and re-deploying the redeployment did not seem to take effect ... will keep trying ... On Sep 4, 5:24 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 > > > > On Thu, Sep 3, 2009 at 7:24 PM, Nicholas Albion <nalb...@gmail.com> wrote: > > > Is it possible to overcome the datastore's 10 writes/second limit by > > batching them? > > > I've got a table containing just over one million records (in CSV > > format). Does a batched write (of around 1MB of data and, say 1000 > > records) count as one write, or 1000 writes?- Hide quoted text - > > - Show quoted text - --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
