Hi Brett, I'm happy to provide you with some details. I think the most important detail though is that the application has been running for months with more or less the same access pattern, and last night's behaviour was anomalous.
The exceptions were all Timeouts. The application gets between 1 and 25 req/second, depending on the time of day. The number of datastore requests ranges from 0 to 10 with the median probably around 1. The amount of data being returned is always small... just simple html or short json strings. There's no contention. I am using memcache yes, but the timeouts always came from datastore operations. Ben On Jun 2, 11:58 am, "Brett (Google)" <brett-appeng...@google.com> wrote: > Hi Ben, > > On Jun 1, 9:35 pm, Ben Nevile <ben.nev...@gmail.com> wrote: > > > About 90 minutes ago one of my applications began failing on somewhere > > close to 100% of its datastore API calls. The app is nowhere close to > > exceeding any quotas, and I haven't made any changes in the code in > > the last ... I don't know, at least 12 hours. > > Could you provide some more information about the source of your > Datastore issues? What exceptions are you getting (what do you see in > your application logs)? What's your access pattern like (requests per > second, data size per request, number of Datastore calls per request)? > Do you have contention on any entities? Do you have a high rate of > querying on a single set of entities? Are you using memcache at all? > > All of these issues can affect your application individually while the > rest of the system works just fine. It's important to keep track of > your application's errors in its logs. It's also useful to load test > your application before you get load to find the source of any sources > of contention before they happen. > > -Brett > App Engine Team --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appengine@googlegroups.com To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en -~----------~----~----~----~------~----~------~--~---
