I have been working on an app for the last 5 days, all was fine until this 
morning.  Since then I'm getting nothing but "Error code 121" for requests
coming from my Android devices.  Web pages are being served properly. 
 Tried rolling back to a previous working version of the device and server
code, same problem.  Tried building and deploying the pure 
Android/AppEngine app, same error.

Killed the GAE instances, cranked the GAE version, nothing helps.

What can I do to help you figure out if it's my problem or your problem? 
 Below is from the pure Google sample code.


   1. 2013-12-11 14:08:14.625 
   /_ah/spi/com.ebay.mike.test.DeviceInfoEndpoint.getDeviceInfo 500 2057ms 
   0kb Google-HTTP-Java-Client/1.16.0-rc (gzip) module=default version=2
   
   216.113.168.148 - - [11/Dec/2013:14:08:14 -0800] "POST 
/_ah/spi/com.ebay.mike.test.DeviceInfoEndpoint.getDeviceInfo HTTP/1.1" 500 0 - 
"Google-HTTP-Java-Client/1.16.0-rc (gzip)" "blue2smog.appspot.com" ms=2057 
cpu_ms=1082 loading_request=1 exit_code=121 app_engine_release=1.8.8 
instance=00c61b117c6ea0963d970075075c6b13db57d7 
<https://appengine.google.com/instances?app_id=s~blue2smog&version_id=2.372266113542667535&key=00c61b117c6ea0963d970075075c6b13db57d7#00c61b117c6ea0963d970075075c6b13db57d7>
   
   2. I2013-12-11 14:08:14.573
   
   This request caused a new process to be started for your application, and 
thus caused your application code to be loaded for the first time. This request 
may thus take longer and use more CPU than a typical request for your 
application.
   
   3. W2013-12-11 14:08:14.573
   
   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. (Error code 121)
   
   


On Wednesday, December 11, 2013 8:54:24 AM UTC-8, [email protected] 
wrote:
>
> We were getting a lot of these errors and eventually noticed that they 
> were all happening on a particular instance(instance #19 for us).  By 
> deleting the backend that the errors were occurring on and then bringing it 
> back up the issue was put to rest.  
>

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