I appreciate any clarifications on my situation as follows. I have an
entity group whose the root entity is called "root". When a particular
URL is requested, a new entity is added to this group as a direct
child of root. The code looks similar to this:
def insert():
root = Root.get_by_key_name
ion times out (due to too much contention or some other
> > issue) the other parts of the transaction will not be applied. For
> > more details
> > see:http://code.google.com/appengine/docs/datastore/transactions.html#Usi...
>
> > Happy coding,
>
> > Jeff
>
>
I got a problem creating a new application. The app identifier was
confirmed to be available; the app title was set to be the same as the
identifier. The authentication option was set to the default. But when
I hit "Save", it always said "Server Error
A server error has occurred"
And the app was
; Hi,
>
> > This is an issue with the Admin Console, and we hope to have it fixed
> > shortly.
>
> > -Marzia
>
> > On Thu, Oct 9, 2008 at 4:04 PM, Marzia Niccolai <[EMAIL PROTECTED]> wrote:
>
> >> Hi David,
>
> >> What is the app id you we
Hi,
I'm a new GAE developer, and now particularly interested in
investigating the difference in concurrency control between the
datastore and a traditional RDBMS. I looked at Ryan Barrett's
presentation about the datastore in the Google IO sessions (http://
sites.google.com/site/io/under-the-cove
Thanks Alexander.
So now this is my guess about the rules of the datastore's timestamp-
based scheduler. If someone could, pls correct where I'm wrong in here
(basically I consolidated the theoretical timestamp-based scheduler
with what I understand from Ryan's presentation):
Each transaction T
Hi Ryan,
So actually you guys use the multiversion timestamp control, and the
rules of the scheduler are in fact more straightforward than what I
outlined. I believe they are as follows (pls correct me if I'm wrong
somewhere):
When a transaction T starts, it is assigned a timestamp TS(T)
generat
Wonderful! Great design!!! Thanks Ryan.
David.
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Ryan,
I have an additional little question about the read action and
rollback.
Suppose we have a group whose root is R with 2 entities X and Y. Now
tx T1 updates X and successfully commits. So CTS(R) becomes TS(T1),
but Y doesn't have an entry for TS(T1) (because it didn't get updated
by T1). Th
