You can read quite a lot about this 
here: https://developers.google.com/appengine/articles/deadlineexceedederrors

The short answer is that if you have a request which gets deadline 
exceeded, that request is handled (fairly) gracefully by having the 
exception bubble up. All other requests on the same instance are killed, 
and you get the message you saw for each of those requests. The instance is 
killed too.

My guess is this is the only way to ensure that an instance doesn't 
overconsume resources in a multi-tenant environment. If you check your 
logs, you should be able to see the cause of this, you just need to look at 
the logs that don't contain this message and see why they're dying. Usually 
this is a SearchService, Datastore or URLFetch issue.

On Friday, December 13, 2013 7:08:56 AM UTC+11, Hans Jakobsen wrote:
>
> Since 3 hours ago, all requests to our appengine application fails with 
> this message in the log:
>
> A problem was encountered with the process that handled this request, causing 
> it to exit. This is likely to cause a new process to be used for the next 
> request to your application. If you see this message frequently, you may be 
> throwing exceptions during the initialization of your application. (Error 
> code 104)
>
>
>
> Nothing was changed in our source code on either sides. Google please 
> solve this and in the future do not beta test on real users !!!
>
>
>

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