I saw this happen once this morning on my new app w/ just myself
poking around.  Noted it in this issue

http://code.google.com/p/googleappengine/issues/detail?id=2396#c28


On Mar 11, 11:07 am, vivpuri <[email protected]> wrote:
> Yes i was at the same spot around 6-7 months back. Earlier app engine
> never showed an error in the logs that you are exceeding the request
> limit. After quite a few emails to appengine team and another release
> of Appengine, that error started showing up in the logs. It was quite
> a harrowing time. I was loosing $$s on appengine billing and getting
> HTTP 500 for almost all my requests.
>
> Anyhow, now my requests mostly finish in 1-2 seconds, few taking
> longer, and few shorter. It's just today looking at those HTTP 500s
> all over the place, i felt those horrific days are back. Checking
> again now, looks like errors have subsided.
>
> Vivek Puri
>
> On Mar 11, 10:56 am, Mike Wesner <[email protected]> wrote:
>
>
>
> > Could be a number of things.
>
> > 1. appspot weather (as I like to call it)
> > 2. datastore slowed down
> > 3. different traffic patterns to your app
>
> > We have been having a hard time with this limit lately.  We did some
> > testing on a billing enabled appspot with no other traffic, then
> > kicked off simulatanious requests to it and tried to figure out if we
> > could get ~30 to work.  Even with hot instances we had a hard time
> > getting to 15 simultaneous requests.  We are not able to run all of
> > our requests in 75ms though.   We are dealing with too many variables/
> > limits, its hard to figure out what is really going on.
>
> > -mike
>
> > On Mar 11, 9:36 am, vivpuri <[email protected]> wrote:
>
> > > Thanks for your response. Yes, but why today. As i mentioned, there
> > > are hardly any code changes to cause that. Even Admin Console was
> > > throwing HTTP 500 earlier today.

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