Our app has been having recurring issues with never-ending datastore 
backups since the beginning of May. We do a nightly scheduled backup of our 
datastore database. Every now and then since May (sometimes a few days in a 
row, sometimes only once every weeks), we have backups that keep on running 
forever: 

- We can see in the datastore admin page that the backup is still running
- We see mapreduce tasks being constantly queued in our default queue, and 
backups never end (we have had backups running for more than weeks without 
ending). 
- Even after aborting the infinite backups, we keep seeing mapreduce tasks 
being queued every second, and the process can't be stopped. The result is 
that we constantly have ah-builtin-datastore instances running handling 
these requests that seemingly fail, and so our monthly bill is a lot higher 
than it usually is.

The only workaround we found was, after aborting the backup, disabling our 
default queue for a few seconds, purging it a few times, and then it seems 
to stop queuing mapreduce tasks when we enable it again.

Does anyone have any clue what's going on?

thanks,
Remko


PS: I filed an issue for this on 
https://code.google.com/p/googleappengine/issues (12120), but not getting 
any response there, so I'm trying the forums.

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