Geoffrey, can you elaborate on "the criteria for creating a new instance" please?
Clearly there are some thresholds being calculated and throttles being applied here, but it's wholly unclear what they are or what design patterns need to be applied to avoid them. There was some guidance from the Google folk around trying to stay < 1000ms, but this is quite difficult where urlfetch is involved, and the limit supposedly does not apply to task queues. Our experience suggest otherwise...? Happy to look at Appstats again, but what should we look for?? Grasping at straws here. J On Aug 27, 1:00 am, Geoffrey Spear <geoffsp...@gmail.com> wrote: > On Aug 26, 8:39 am, David Burns <theautomatedtes...@googlemail.com> > wrote: > > > > > I am getting this error too and I am not doing any URL fetches. I have > > put a lot of logging throughout my application and getting this error > > before any of my logging is hit > > > # > > > 1. > > 08-25 05:30AM 43.978 / 500 10011ms 0cpu_ms 0kb Mozilla/5.0 > > (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.6 (KHTML, like > > Gecko) Chrome/6.0.495.0 Safari/534.6,gzip(gfe),gzip(gfe) > > See details > > > 89.21.226.10 - - [25/Aug/2010:05:30:53 -0700] "GET / HTTP/1.1" > > 500 0 - "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/ > > 534.6 (KHTML, like Gecko) Chrome/6.0.495.0 Safari/ > > 534.6,gzip(gfe),gzip(gfe)" "www.theautomatedtester.co.uk" ms=10012 > > cpu_ms=0 api_cpu_ms=0 cpm_usd=0.000056 > > > 2. > > W 08-25 05:30AM 53.989 > > > Request was aborted after waiting too long to attempt to service > > your request. This may happen sporadically when the App Engine serving > > cluster is under unexpectedly high or uneven load. If you see this > > message frequently, please contact the App Engine team. > > > My App does a quick read from the Datastore to work out what it needs > > to do from the URL and then carries on. My datastore is tiny (680kb > > according to the datastore statistics) so don't think that it could be > > due to me hitting the datastore. > > The size of the datastore is completely irrelevant to speed; it's > built to scale. > > This particular message should only be generated when your application > doesn't meet the criteria for creating a new instance to serve the > incoming request, and all existing instances are in use. This is > generally because the existing instances are doing something that's > taking a lot of time; the log for the failed request isn't what's > relevant, it's the logs for the requests that are actually working > that you should be looking at, probably with AppStats as well. -- 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-appeng...@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.
