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Backend "Process moved to another machine" and not with error 500

I have a process that takes about five minutes. It runs a cron job every two hours in the backend instance.

Recently, a process has begun to fail; not every time, but several times a day. The first thing that happens is that memcache starts throwing exceptions:

04:21:13.640 com.google.appengine.api.memcache.LogAndContinueErrorHandler handleServiceError: Service error in memcache
com.google.appengine.api.memcache.MemcacheServiceException: Memcache get: exception getting 1 key (ItemFollowableCompleted:RegionUS:P8XD:0)
at com.google.appengine.api.memcache.MemcacheServiceApiHelper$RpcResponseHandler.handleApiProxyException(MemcacheServiceApiHelper.java:68)
at com.google.appengine.api.memcache.MemcacheServiceApiHelper$1.absorbParentException(MemcacheServiceApiHelper.java:109)

None of them is a fatal exception, but after a few seconds the process ends without warning or a shutdown message. Magazines show

04:21:30.591 Process moved to a different machine.

and error 500.

Is this a problem with the Google infrastructure related to memcache, or is there something in the application code that could cause it?

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3 answers

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