What platform? Java or Python? On Mon, Nov 22, 2010 at 11:03 AM, Alfred Fuller < [email protected] <arfuller%[email protected]>> wrote:
> 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]<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.
