This is something different.  There is no "max instances" setting -
it's "max idle instances".  GAE will still spin up as many instances
as it deems necessary to meet demand... right up until you exhaust
quota.

FWIW, the paid scheduler does seem to operate considerably better than
the free scheduler.  For reasons I don't quite understand, free apps
seem to be pretty much unusable.  Enabling billing creates a much
smoother experience.

Jeff

On Mon, Jul 9, 2012 at 9:19 PM, Kyle Finley <[email protected]> wrote:
> I'm seeing the same thing with the test app I created. Even though I had max 
> instances set to 1 the scheduler still started up a second instance. During 
> this time I had several request that resulted in 500 server errors. Once the 
> second instance was started latency increased - as if the scheduler couldn't 
> decide which instance to route the request to. After a few seconds it 
> subsisted. I believe that this transition period maybe responsible for error 
> rates. The bad thing about it is:
>
> 1) The errors didn't appear in the logs.  So it is quite likely that this is 
> a common problem, but few developers are aware of it.
> 2) There's nothing that can be done to fix it.
>
> In fairness I was testing under the free quota, so maybe the scheduler 
> behaves better on payed apps.
>
> On Jul 9, 2012, at 10:05 PM, Richard wrote:
>
>> Ok, so I sat with Jeff in a G+ hangout for a while tonight, and we could not 
>> figure it out - other than my app is confusing the crap out of the scheduler 
>> which is then not sending requests to instances.
>
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