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 locke2...@gmail.com 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 schwa...@google.com wrote: On Fri, Jan
22, 2010 at 10:55 AM, Millisecond millisec...@gmail.com 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
raisedhttp://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
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