I am also getting this error on a simple app that sends back "hello world" essentially. There does seem to be something strange going on because I'm the only one accessing the app, so it couldn't be simultaneous requests. Have you found anything around this?
On Jan 22, 11:44 am, Locke <[email protected]> wrote: > I have seen this error even for "hello world." It MAY be caused by too > many simultaneous requests, but it also may be caused by a problem > with appengine itself. > > On Jan 22, 12:30 pm, Don Schwarz <[email protected]> wrote:> On Fri, Jan > 22, 2010 at 10:55 AM, Millisecond <[email protected]> wrote: > > > I'm getting this log message a lot in my application: > > > > >>"Request was aborted after waiting too long to attempt to service your > > > request. Most likely, this indicates that you have reached your > > > simultaneous > > > dynamic request limit. This is almost always due to excessively high > > > latency > > > in your app. Please > > > seehttp://code.google.com/appengine/docs/quotas.htmlformoredetails."; > > > > I do have "excessive latency" in that I run non-trivial tasks in the > > > TaskQueue handlers interacting with external systems averaging about > > > 10 seconds per handler with a couple per "cycle" pushing the 30 second > > > limit, but on the Dashboard my requests/second never seem to exceed > > > ~1.5. I have billing enabled and my understanding is that gives me > > > 500 simultaneous requests. > > > That's not accurate. Where did you hear this? > > > Here's the documentation we have on this: > > >http://code.google.com/appengine/docs/java/runtime.htmlsays: > > > *** An application can process around 30 active dynamic requests > > simultaneously. This means that an application whose average server-side > > request processing time is 75 milliseconds can serve up to (1000 ms/second / > > 75 ms/request) * 30 = 400 requests/second without incurring any additional > > latency. Applications that are heavily CPU-bound may incur some additional > > latency in long-running requests in order to make room for other apps > > sharing the same servers. Requests for static files are not affected by this > > limit. > > > *If your application is making efficient use of resources and traffic is > > about to exceed your expected maximum queries per second, you can request > > that the simultaneous dynamic request limit be > > raised<http://code.google.com/appengine/kb/billing.html#cpu>. > > App Engine can scale far beyond 30 simultaneous requests; this default limit > > is in place to prevent a poorly performing or malicious app from hoarding > > resources.* > > > I suggest that you calculate the maximum number of simultaneous requests > > that you need to serve and fill out the above form. > > > Thanks, > > Don -- 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 [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-java?hl=en.
