Sorry, when I said "I have a GWT app that takes one major hit at startup (possibly seconds)" I meant the GWT client app itself, on startup, has a login() call to the server that can take seconds to process. Synchronizing facebook data and all that jazz.
I'm not terribly concerned about this since the ratio of login()s to "other queries" is low, browser refreshes will find mostly cached data, and I am now hitting Facebook with multiple batches in parallel... but since I don't really know the limits, it would suck to find out my architecture doesn't work in-vivo. Jeff On Wed, Jun 8, 2011 at 1:50 AM, Ikai Lan (Google) <ika...@google.com> wrote: > IIRC, the loading request latency doesn't affect the average time. It's an > average, I believe, and it's a moving window. > A long startup time, however, will result in the scheduler almost always > favoring putting items in the pending queue instead of spinning up new > instances, though. When scheduling a request, we do the lesser of: > cold start time vs. sliding window of pending ms > So if your app takes 10 seconds to startup and requests are spending 5 > seconds in the pending queue, we will send the requests to the pending queue > until the expected wait is 10+ seconds. If we decide to spin up new > instances, we only spin up one instance at a time. During the spin up time, > we continue to place new requests on the queue. > I'm thinking we need a new section about scheduling, auto scaling and > wallclock. The wallclock stuff is probably the most confusing ... > Ikai Lan > Developer Programs Engineer, Google App Engine > Blog: http://googleappengine.blogspot.com > Twitter: http://twitter.com/app_engine > Reddit: http://www.reddit.com/r/appengine > > > On Wed, Jun 8, 2011 at 1:50 PM, Jeff Schnitzer <j...@infohazard.org> wrote: >> >> Is this documented anywhere? It's something I figured out from >> occasional comments I've seen on this list over the years, but I've >> never seen it mentioned in the official documentation. And it's kinda >> important. >> >> In particular, I'd like to know what the bounds are for threaded java, >> and how the average time is computed - is it mean, median, or mode? I >> have a GWT app that takes one major hit at startup (possibly seconds) >> and then performs lots of smaller hits as the user interacts with the >> app. It would be nice to know if this will cause problems down the >> road... >> >> Jeff >> >> On Tue, Jun 7, 2011 at 6:41 PM, Ikai Lan (Google) <ika...@google.com> >> wrote: >> > You get this error when your request waits in a pending queue. >> > App Engine apps are autoscaled IF they can average under 1000ms. If they >> > cannot, we do not give you additional instances, and requests line up in >> > a >> > pending queue. If your request waits in the pending queue for more than >> > N >> > seconds (I think N is 9 at the moment but I don't know for sure off the >> > top >> > of my head), this message is returned. >> > You'll need to look at the average latency and figure out how to drop it >> > to >> > under 1000ms. Alternatively, if you enable concurrent Java requests, >> > it'll >> > be a higher ceiling before this error appears if you have "Always On" >> > since >> > you can serve a total of 3 (always on instances) * M (concurrency >> > factor, I >> > think this is 40 at the moment) requests at one time without requiring >> > autoscaling. >> > Ikai Lan >> > Developer Programs Engineer, Google App Engine >> > Blog: http://googleappengine.blogspot.com >> > Twitter: http://twitter.com/app_engine >> > Reddit: http://www.reddit.com/r/appengine >> > >> > >> > On Wed, Jun 8, 2011 at 1:06 AM, holger <holger.weissbo...@gmail.com> >> > wrote: >> >> >> >> Hello everyone, >> >> >> >> >> >> i am running a java REST service in the appengine and get this: >> >> >> >> "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." >> >> >> >> >> >> I see this message frequently and customer requests fail because of it. >> >> Can anyone help me please! Thanks a lot. >> >> >> >> -- >> >> You received this message because you are subscribed to the Google >> >> Groups >> >> "Google App Engine for Java" group. >> >> To view this discussion on the web visit >> >> >> >> https://groups.google.com/d/msg/google-appengine-java/-/X3E4cnhhblA3Z3dK. >> >> To post to this group, send email to >> >> google-appengine-java@googlegroups.com. >> >> To unsubscribe from this group, send email to >> >> google-appengine-java+unsubscr...@googlegroups.com. >> >> For more options, visit this group at >> >> http://groups.google.com/group/google-appengine-java?hl=en. >> > >> > -- >> > You received this message because you are subscribed to the Google >> > Groups >> > "Google App Engine for Java" group. >> > To post to this group, send email to >> > google-appengine-java@googlegroups.com. >> > To unsubscribe from this group, send email to >> > google-appengine-java+unsubscr...@googlegroups.com. >> > For more options, visit this group at >> > http://groups.google.com/group/google-appengine-java?hl=en. >> > >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Google App Engine for Java" group. >> To post to this group, send email to >> google-appengine-java@googlegroups.com. >> To unsubscribe from this group, send email to >> google-appengine-java+unsubscr...@googlegroups.com. >> For more options, visit this group at >> http://groups.google.com/group/google-appengine-java?hl=en. >> > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine for Java" group. > To post to this group, send email to google-appengine-java@googlegroups.com. > To unsubscribe from this group, send email to > google-appengine-java+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/google-appengine-java?hl=en. > -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
