This sound like what would happen if read_policy=EVENTUAL_CONSISTENCY is enabled. Are you setting this anywhere?
On Fri, Nov 19, 2010 at 9:37 AM, Sanjay <[email protected]> wrote: > I'm pretty sure the data consistency is not in our application because > of the characteristics of the problem. I do not use Memcache or a per- > instance in-memory cache, and perform direct reads from the datastore > as the application is high-write, low-read. > > I can reproduce this problem at will by just refreshing a page that > reloads the data from the datastore. About 20% of the time I get an > incorrect value. The data is being written using a cron that fires > every 10 minutes, and there are no other writers to this entry. Thus > I'm pretty sure that it's not being performed by an incorrect write. > From the characteristics, it seems to me like there's an instance > serving the application that is stale and serving bad data. Perhaps > this instance is in a different datacenter than the main set of > instances, and thus Megastore replication has fallen behind, or is in > an inconsistent state? > > I've been working with AppEngine for nearly the last year, and haven't > seen this bizarre behavior before. > > Is there a way to escalate such issues for someone in Google to have a > look? > > Thanks! > > On Nov 19, 8:31 am, Robert Kluin <[email protected]> wrote: > > I did not see anything quite like that. It sort of sounds like you > > might have a cache bug. Perhaps instance variables are being used as > > cache? > > > > Robert > > > > > > > > > > > > > > > > On Fri, Nov 19, 2010 at 04:04, Sanjay <[email protected]> wrote: > > > Hello, > > > > > Starting earlier today around the time of the App Engine deploy > > > outage, I'm seeing a lot of data inconsistency. Data written several > > > minutes earlier cannot be read back consistently. Even more > > > surprisingly, just retrying the operation multiple times yields older > > > versions of the same data. Is anyone else seeing this? > > > > > Thanks, > > > Sanjay > > > > > -- > > > You received this message because you are subscribed to the Google > Groups "Google App Engine" group. > > > To post to this group, send email to [email protected] > . > > > To unsubscribe from this group, send email to > [email protected]<google-appengine%[email protected]> > . > > > For more options, visit this group athttp:// > groups.google.com/group/google-appengine?hl=en. > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]<google-appengine%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/google-appengine?hl=en. > > -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
