It sounds like your requests are blocking trying to hit an external
webserver which is slow.  If you're holding each request open for ~10
seconds (after which the urlfetch fails), you're not going to be able
to have many incoming requests at the same time.

On Sep 23, 10:02 am, Steven Harrington
<[email protected]> wrote:
> Hi
>
> We are having trouble with constant 500 server errors. A sample error
> snippet is below:
>
> 09-23 06:33AM 55.974 /fetch?url=http%3A//74.125.113.132/search%3Fq
> %3Dcache%3A9wdNxvEMZjAJ%3Awww.waterloowatch.com/Index_files
> %25255CFluoride%252520and%252520Skeletal%252520Fluorosis.pdf%2Bskeletal
> %2Bfluorosis%26cd%3D21%26hl%3Den%26ct%3Dclnk%26gl%3Dus%26client
> %3Dfirefox-a&sessionid=753886&srchwds=skeletal+fluorosis 500 10639ms
> 0cpu_ms 0kb Python-urllib/1.17,gzip(gfe)
>
> Additionally, we also keep getting these errors:
> --
> Request was aborted after waiting too long to attempt to service your
> request. Most likely, this indicates that you have reached your
> simultaneous active request limit.
> --
>
> and
> --
> This request used a high amount of CPU, and was roughly 1.3 times over
> the average request CPU limit. High CPU requests have a small quota,
> and if you exceed this quota, your app will be temporarily disabled.
> --
> Thinking it could be a problem with the limitations on free accounts,
> we switched over to the billing option but the errors persist. Is
> there any way to increase the simultaneous active request limit or any
> other workaround?
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